git.oblomov.eu Git - linux-2.6/blob - drivers/char/synclink_gt.c

   1 /*
   2  * Device driver for Microgate SyncLink GT serial adapters.
   3  *
   4  * written by Paul Fulghum for Microgate Corporation
   5  * paulkf@microgate.com
   6  *
   7  * Microgate and SyncLink are trademarks of Microgate Corporation
   8  *
   9  * This code is released under the GNU General Public License (GPL)
  10  *
  11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  12  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  13  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  14  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  15  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  16  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  17  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  18  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  19  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  20  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  21  * OF THE POSSIBILITY OF SUCH DAMAGE.
  22  */
  23
  24 /*
  25  * DEBUG OUTPUT DEFINITIONS
  26  *
  27  * uncomment lines below to enable specific types of debug output
  28  *
  29  * DBGINFO   information - most verbose output
  30  * DBGERR    serious errors
  31  * DBGBH     bottom half service routine debugging
  32  * DBGISR    interrupt service routine debugging
  33  * DBGDATA   output receive and transmit data
  34  * DBGTBUF   output transmit DMA buffers and registers
  35  * DBGRBUF   output receive DMA buffers and registers
  36  */
  37
  38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
  39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
  40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
  41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
  42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
  43 //#define DBGTBUF(info) dump_tbufs(info)
  44 //#define DBGRBUF(info) dump_rbufs(info)
  45
  46
  47 #include <linux/module.h>
  48 #include <linux/errno.h>
  49 #include <linux/signal.h>
  50 #include <linux/sched.h>
  51 #include <linux/timer.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/pci.h>
  54 #include <linux/tty.h>
  55 #include <linux/tty_flip.h>
  56 #include <linux/serial.h>
  57 #include <linux/major.h>
  58 #include <linux/string.h>
  59 #include <linux/fcntl.h>
  60 #include <linux/ptrace.h>
  61 #include <linux/ioport.h>
  62 #include <linux/mm.h>
  63 #include <linux/seq_file.h>
  64 #include <linux/slab.h>
  65 #include <linux/netdevice.h>
  66 #include <linux/vmalloc.h>
  67 #include <linux/init.h>
  68 #include <linux/delay.h>
  69 #include <linux/ioctl.h>
  70 #include <linux/termios.h>
  71 #include <linux/bitops.h>
  72 #include <linux/workqueue.h>
  73 #include <linux/hdlc.h>
  74 #include <linux/synclink.h>
  75
  76 #include <asm/system.h>
  77 #include <asm/io.h>
  78 #include <asm/irq.h>
  79 #include <asm/dma.h>
  80 #include <asm/types.h>
  81 #include <asm/uaccess.h>
  82
  83 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
  84 #define SYNCLINK_GENERIC_HDLC 1
  85 #else
  86 #define SYNCLINK_GENERIC_HDLC 0
  87 #endif
  88
  89 /*
  90  * module identification
  91  */
  92 static char *driver_name     = "SyncLink GT";
  93 static char *tty_driver_name = "synclink_gt";
  94 static char *tty_dev_prefix  = "ttySLG";
  95 MODULE_LICENSE("GPL");
  96 #define MGSL_MAGIC 0x5401
  97 #define MAX_DEVICES 32
  98
  99 static struct pci_device_id pci_table[] = {
 100         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 101         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 102         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 103         {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 104         {0,}, /* terminate list */
 105 };
 106 MODULE_DEVICE_TABLE(pci, pci_table);
 107
 108 static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 109 static void remove_one(struct pci_dev *dev);
 110 static struct pci_driver pci_driver = {
 111         .name           = "synclink_gt",
 112         .id_table       = pci_table,
 113         .probe          = init_one,
 114         .remove         = __devexit_p(remove_one),
 115 };
 116
 117 static bool pci_registered;
 118
 119 /*
 120  * module configuration and status
 121  */
 122 static struct slgt_info *slgt_device_list;
 123 static int slgt_device_count;
 124
 125 static int ttymajor;
 126 static int debug_level;
 127 static int maxframe[MAX_DEVICES];
 128
 129 module_param(ttymajor, int, 0);
 130 module_param(debug_level, int, 0);
 131 module_param_array(maxframe, int, NULL, 0);
 132
 133 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
 134 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
 135 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
 136
 137 /*
 138  * tty support and callbacks
 139  */
 140 static struct tty_driver *serial_driver;
 141
 142 static int  open(struct tty_struct *tty, struct file * filp);
 143 static void close(struct tty_struct *tty, struct file * filp);
 144 static void hangup(struct tty_struct *tty);
 145 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 146
 147 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 148 static int put_char(struct tty_struct *tty, unsigned char ch);
 149 static void send_xchar(struct tty_struct *tty, char ch);
 150 static void wait_until_sent(struct tty_struct *tty, int timeout);
 151 static int  write_room(struct tty_struct *tty);
 152 static void flush_chars(struct tty_struct *tty);
 153 static void flush_buffer(struct tty_struct *tty);
 154 static void tx_hold(struct tty_struct *tty);
 155 static void tx_release(struct tty_struct *tty);
 156
 157 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 158 static int  chars_in_buffer(struct tty_struct *tty);
 159 static void throttle(struct tty_struct * tty);
 160 static void unthrottle(struct tty_struct * tty);
 161 static int set_break(struct tty_struct *tty, int break_state);
 162
 163 /*
 164  * generic HDLC support and callbacks
 165  */
 166 #if SYNCLINK_GENERIC_HDLC
 167 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 168 static void hdlcdev_tx_done(struct slgt_info *info);
 169 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
 170 static int  hdlcdev_init(struct slgt_info *info);
 171 static void hdlcdev_exit(struct slgt_info *info);
 172 #endif
 173
 174
 175 /*
 176  * device specific structures, macros and functions
 177  */
 178
 179 #define SLGT_MAX_PORTS 4
 180 #define SLGT_REG_SIZE  256
 181
 182 /*
 183  * conditional wait facility
 184  */
 185 struct cond_wait {
 186         struct cond_wait *next;
 187         wait_queue_head_t q;
 188         wait_queue_t wait;
 189         unsigned int data;
 190 };
 191 static void init_cond_wait(struct cond_wait *w, unsigned int data);
 192 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
 193 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
 194 static void flush_cond_wait(struct cond_wait **head);
 195
 196 /*
 197  * DMA buffer descriptor and access macros
 198  */
 199 struct slgt_desc
 200 {
 201         __le16 count;
 202         __le16 status;
 203         __le32 pbuf;  /* physical address of data buffer */
 204         __le32 next;  /* physical address of next descriptor */
 205
 206         /* driver book keeping */
 207         char *buf;          /* virtual  address of data buffer */
 208         unsigned int pdesc; /* physical address of this descriptor */
 209         dma_addr_t buf_dma_addr;
 210         unsigned short buf_count;
 211 };
 212
 213 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
 214 #define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
 215 #define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
 216 #define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
 217 #define desc_count(a)      (le16_to_cpu((a).count))
 218 #define desc_status(a)     (le16_to_cpu((a).status))
 219 #define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
 220 #define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
 221 #define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
 222 #define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
 223 #define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
 224
 225 struct _input_signal_events {
 226         int ri_up;
 227         int ri_down;
 228         int dsr_up;
 229         int dsr_down;
 230         int dcd_up;
 231         int dcd_down;
 232         int cts_up;
 233         int cts_down;
 234 };
 235
 236 /*
 237  * device instance data structure
 238  */
 239 struct slgt_info {
 240         void *if_ptr;           /* General purpose pointer (used by SPPP) */
 241         struct tty_port port;
 242
 243         struct slgt_info *next_device;  /* device list link */
 244
 245         int magic;
 246
 247         char device_name[25];
 248         struct pci_dev *pdev;
 249
 250         int port_count;  /* count of ports on adapter */
 251         int adapter_num; /* adapter instance number */
 252         int port_num;    /* port instance number */
 253
 254         /* array of pointers to port contexts on this adapter */
 255         struct slgt_info *port_array[SLGT_MAX_PORTS];
 256
 257         int                     line;           /* tty line instance number */
 258
 259         struct mgsl_icount      icount;
 260
 261         int                     timeout;
 262         int                     x_char;         /* xon/xoff character */
 263         unsigned int            read_status_mask;
 264         unsigned int            ignore_status_mask;
 265
 266         wait_queue_head_t       status_event_wait_q;
 267         wait_queue_head_t       event_wait_q;
 268         struct timer_list       tx_timer;
 269         struct timer_list       rx_timer;
 270
 271         unsigned int            gpio_present;
 272         struct cond_wait        *gpio_wait_q;
 273
 274         spinlock_t lock;        /* spinlock for synchronizing with ISR */
 275
 276         struct work_struct task;
 277         u32 pending_bh;
 278         bool bh_requested;
 279         bool bh_running;
 280
 281         int isr_overflow;
 282         bool irq_requested;     /* true if IRQ requested */
 283         bool irq_occurred;      /* for diagnostics use */
 284
 285         /* device configuration */
 286
 287         unsigned int bus_type;
 288         unsigned int irq_level;
 289         unsigned long irq_flags;
 290
 291         unsigned char __iomem * reg_addr;  /* memory mapped registers address */
 292         u32 phys_reg_addr;
 293         bool reg_addr_requested;
 294
 295         MGSL_PARAMS params;       /* communications parameters */
 296         u32 idle_mode;
 297         u32 max_frame_size;       /* as set by device config */
 298
 299         unsigned int rbuf_fill_level;
 300         unsigned int if_mode;
 301
 302         /* device status */
 303
 304         bool rx_enabled;
 305         bool rx_restart;
 306
 307         bool tx_enabled;
 308         bool tx_active;
 309
 310         unsigned char signals;    /* serial signal states */
 311         int init_error;  /* initialization error */
 312
 313         unsigned char *tx_buf;
 314         int tx_count;
 315
 316         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 317         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 318         bool drop_rts_on_tx_done;
 319         struct  _input_signal_events    input_signal_events;
 320
 321         int dcd_chkcount;       /* check counts to prevent */
 322         int cts_chkcount;       /* too many IRQs if a signal */
 323         int dsr_chkcount;       /* is floating */
 324         int ri_chkcount;
 325
 326         char *bufs;             /* virtual address of DMA buffer lists */
 327         dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
 328
 329         unsigned int rbuf_count;
 330         struct slgt_desc *rbufs;
 331         unsigned int rbuf_current;
 332         unsigned int rbuf_index;
 333
 334         unsigned int tbuf_count;
 335         struct slgt_desc *tbufs;
 336         unsigned int tbuf_current;
 337         unsigned int tbuf_start;
 338
 339         unsigned char *tmp_rbuf;
 340         unsigned int tmp_rbuf_count;
 341
 342         /* SPPP/Cisco HDLC device parts */
 343
 344         int netcount;
 345         spinlock_t netlock;
 346 #if SYNCLINK_GENERIC_HDLC
 347         struct net_device *netdev;
 348 #endif
 349
 350 };
 351
 352 static MGSL_PARAMS default_params = {
 353         .mode            = MGSL_MODE_HDLC,
 354         .loopback        = 0,
 355         .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
 356         .encoding        = HDLC_ENCODING_NRZI_SPACE,
 357         .clock_speed     = 0,
 358         .addr_filter     = 0xff,
 359         .crc_type        = HDLC_CRC_16_CCITT,
 360         .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
 361         .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
 362         .data_rate       = 9600,
 363         .data_bits       = 8,
 364         .stop_bits       = 1,
 365         .parity          = ASYNC_PARITY_NONE
 366 };
 367
 368
 369 #define BH_RECEIVE  1
 370 #define BH_TRANSMIT 2
 371 #define BH_STATUS   4
 372 #define IO_PIN_SHUTDOWN_LIMIT 100
 373
 374 #define DMABUFSIZE 256
 375 #define DESC_LIST_SIZE 4096
 376
 377 #define MASK_PARITY  BIT1
 378 #define MASK_FRAMING BIT0
 379 #define MASK_BREAK   BIT14
 380 #define MASK_OVERRUN BIT4
 381
 382 #define GSR   0x00 /* global status */
 383 #define JCR   0x04 /* JTAG control */
 384 #define IODR  0x08 /* GPIO direction */
 385 #define IOER  0x0c /* GPIO interrupt enable */
 386 #define IOVR  0x10 /* GPIO value */
 387 #define IOSR  0x14 /* GPIO interrupt status */
 388 #define TDR   0x80 /* tx data */
 389 #define RDR   0x80 /* rx data */
 390 #define TCR   0x82 /* tx control */
 391 #define TIR   0x84 /* tx idle */
 392 #define TPR   0x85 /* tx preamble */
 393 #define RCR   0x86 /* rx control */
 394 #define VCR   0x88 /* V.24 control */
 395 #define CCR   0x89 /* clock control */
 396 #define BDR   0x8a /* baud divisor */
 397 #define SCR   0x8c /* serial control */
 398 #define SSR   0x8e /* serial status */
 399 #define RDCSR 0x90 /* rx DMA control/status */
 400 #define TDCSR 0x94 /* tx DMA control/status */
 401 #define RDDAR 0x98 /* rx DMA descriptor address */
 402 #define TDDAR 0x9c /* tx DMA descriptor address */
 403
 404 #define RXIDLE      BIT14
 405 #define RXBREAK     BIT14
 406 #define IRQ_TXDATA  BIT13
 407 #define IRQ_TXIDLE  BIT12
 408 #define IRQ_TXUNDER BIT11 /* HDLC */
 409 #define IRQ_RXDATA  BIT10
 410 #define IRQ_RXIDLE  BIT9  /* HDLC */
 411 #define IRQ_RXBREAK BIT9  /* async */
 412 #define IRQ_RXOVER  BIT8
 413 #define IRQ_DSR     BIT7
 414 #define IRQ_CTS     BIT6
 415 #define IRQ_DCD     BIT5
 416 #define IRQ_RI      BIT4
 417 #define IRQ_ALL     0x3ff0
 418 #define IRQ_MASTER  BIT0
 419
 420 #define slgt_irq_on(info, mask) \
 421         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
 422 #define slgt_irq_off(info, mask) \
 423         wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
 424
 425 static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
 426 static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
 427 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
 428 static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
 429 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
 430 static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
 431
 432 static void  msc_set_vcr(struct slgt_info *info);
 433
 434 static int  startup(struct slgt_info *info);
 435 static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
 436 static void shutdown(struct slgt_info *info);
 437 static void program_hw(struct slgt_info *info);
 438 static void change_params(struct slgt_info *info);
 439
 440 static int  register_test(struct slgt_info *info);
 441 static int  irq_test(struct slgt_info *info);
 442 static int  loopback_test(struct slgt_info *info);
 443 static int  adapter_test(struct slgt_info *info);
 444
 445 static void reset_adapter(struct slgt_info *info);
 446 static void reset_port(struct slgt_info *info);
 447 static void async_mode(struct slgt_info *info);
 448 static void sync_mode(struct slgt_info *info);
 449
 450 static void rx_stop(struct slgt_info *info);
 451 static void rx_start(struct slgt_info *info);
 452 static void reset_rbufs(struct slgt_info *info);
 453 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
 454 static void rdma_reset(struct slgt_info *info);
 455 static bool rx_get_frame(struct slgt_info *info);
 456 static bool rx_get_buf(struct slgt_info *info);
 457
 458 static void tx_start(struct slgt_info *info);
 459 static void tx_stop(struct slgt_info *info);
 460 static void tx_set_idle(struct slgt_info *info);
 461 static unsigned int free_tbuf_count(struct slgt_info *info);
 462 static unsigned int tbuf_bytes(struct slgt_info *info);
 463 static void reset_tbufs(struct slgt_info *info);
 464 static void tdma_reset(struct slgt_info *info);
 465 static void tdma_start(struct slgt_info *info);
 466 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
 467
 468 static void get_signals(struct slgt_info *info);
 469 static void set_signals(struct slgt_info *info);
 470 static void enable_loopback(struct slgt_info *info);
 471 static void set_rate(struct slgt_info *info, u32 data_rate);
 472
 473 static int  bh_action(struct slgt_info *info);
 474 static void bh_handler(struct work_struct *work);
 475 static void bh_transmit(struct slgt_info *info);
 476 static void isr_serial(struct slgt_info *info);
 477 static void isr_rdma(struct slgt_info *info);
 478 static void isr_txeom(struct slgt_info *info, unsigned short status);
 479 static void isr_tdma(struct slgt_info *info);
 480
 481 static int  alloc_dma_bufs(struct slgt_info *info);
 482 static void free_dma_bufs(struct slgt_info *info);
 483 static int  alloc_desc(struct slgt_info *info);
 484 static void free_desc(struct slgt_info *info);
 485 static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 486 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
 487
 488 static int  alloc_tmp_rbuf(struct slgt_info *info);
 489 static void free_tmp_rbuf(struct slgt_info *info);
 490
 491 static void tx_timeout(unsigned long context);
 492 static void rx_timeout(unsigned long context);
 493
 494 /*
 495  * ioctl handlers
 496  */
 497 static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
 498 static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 499 static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
 500 static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
 501 static int  set_txidle(struct slgt_info *info, int idle_mode);
 502 static int  tx_enable(struct slgt_info *info, int enable);
 503 static int  tx_abort(struct slgt_info *info);
 504 static int  rx_enable(struct slgt_info *info, int enable);
 505 static int  modem_input_wait(struct slgt_info *info,int arg);
 506 static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
 507 static int  tiocmget(struct tty_struct *tty, struct file *file);
 508 static int  tiocmset(struct tty_struct *tty, struct file *file,
 509                      unsigned int set, unsigned int clear);
 510 static int set_break(struct tty_struct *tty, int break_state);
 511 static int  get_interface(struct slgt_info *info, int __user *if_mode);
 512 static int  set_interface(struct slgt_info *info, int if_mode);
 513 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 514 static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 515 static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
 516
 517 /*
 518  * driver functions
 519  */
 520 static void add_device(struct slgt_info *info);
 521 static void device_init(int adapter_num, struct pci_dev *pdev);
 522 static int  claim_resources(struct slgt_info *info);
 523 static void release_resources(struct slgt_info *info);
 524
 525 /*
 526  * DEBUG OUTPUT CODE
 527  */
 528 #ifndef DBGINFO
 529 #define DBGINFO(fmt)
 530 #endif
 531 #ifndef DBGERR
 532 #define DBGERR(fmt)
 533 #endif
 534 #ifndef DBGBH
 535 #define DBGBH(fmt)
 536 #endif
 537 #ifndef DBGISR
 538 #define DBGISR(fmt)
 539 #endif
 540
 541 #ifdef DBGDATA
 542 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
 543 {
 544         int i;
 545         int linecount;
 546         printk("%s %s data:\n",info->device_name, label);
 547         while(count) {
 548                 linecount = (count > 16) ? 16 : count;
 549                 for(i=0; i < linecount; i++)
 550                         printk("%02X ",(unsigned char)data[i]);
 551                 for(;i<17;i++)
 552                         printk("   ");
 553                 for(i=0;i<linecount;i++) {
 554                         if (data[i]>=040 && data[i]<=0176)
 555                                 printk("%c",data[i]);
 556                         else
 557                                 printk(".");
 558                 }
 559                 printk("\n");
 560                 data  += linecount;
 561                 count -= linecount;
 562         }
 563 }
 564 #else
 565 #define DBGDATA(info, buf, size, label)
 566 #endif
 567
 568 #ifdef DBGTBUF
 569 static void dump_tbufs(struct slgt_info *info)
 570 {
 571         int i;
 572         printk("tbuf_current=%d\n", info->tbuf_current);
 573         for (i=0 ; i < info->tbuf_count ; i++) {
 574                 printk("%d: count=%04X status=%04X\n",
 575                         i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
 576         }
 577 }
 578 #else
 579 #define DBGTBUF(info)
 580 #endif
 581
 582 #ifdef DBGRBUF
 583 static void dump_rbufs(struct slgt_info *info)
 584 {
 585         int i;
 586         printk("rbuf_current=%d\n", info->rbuf_current);
 587         for (i=0 ; i < info->rbuf_count ; i++) {
 588                 printk("%d: count=%04X status=%04X\n",
 589                         i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
 590         }
 591 }
 592 #else
 593 #define DBGRBUF(info)
 594 #endif
 595
 596 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
 597 {
 598 #ifdef SANITY_CHECK
 599         if (!info) {
 600                 printk("null struct slgt_info for (%s) in %s\n", devname, name);
 601                 return 1;
 602         }
 603         if (info->magic != MGSL_MAGIC) {
 604                 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
 605                 return 1;
 606         }
 607 #else
 608         if (!info)
 609                 return 1;
 610 #endif
 611         return 0;
 612 }
 613
 614 /**
 615  * line discipline callback wrappers
 616  *
 617  * The wrappers maintain line discipline references
 618  * while calling into the line discipline.
 619  *
 620  * ldisc_receive_buf  - pass receive data to line discipline
 621  */
 622 static void ldisc_receive_buf(struct tty_struct *tty,
 623                               const __u8 *data, char *flags, int count)
 624 {
 625         struct tty_ldisc *ld;
 626         if (!tty)
 627                 return;
 628         ld = tty_ldisc_ref(tty);
 629         if (ld) {
 630                 if (ld->ops->receive_buf)
 631                         ld->ops->receive_buf(tty, data, flags, count);
 632                 tty_ldisc_deref(ld);
 633         }
 634 }
 635
 636 /* tty callbacks */
 637
 638 static int open(struct tty_struct *tty, struct file *filp)
 639 {
 640         struct slgt_info *info;
 641         int retval, line;
 642         unsigned long flags;
 643
 644         line = tty->index;
 645         if ((line < 0) || (line >= slgt_device_count)) {
 646                 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
 647                 return -ENODEV;
 648         }
 649
 650         info = slgt_device_list;
 651         while(info && info->line != line)
 652                 info = info->next_device;
 653         if (sanity_check(info, tty->name, "open"))
 654                 return -ENODEV;
 655         if (info->init_error) {
 656                 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
 657                 return -ENODEV;
 658         }
 659
 660         tty->driver_data = info;
 661         info->port.tty = tty;
 662
 663         DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
 664
 665         /* If port is closing, signal caller to try again */
 666         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
 667                 if (info->port.flags & ASYNC_CLOSING)
 668                         interruptible_sleep_on(&info->port.close_wait);
 669                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 670                         -EAGAIN : -ERESTARTSYS);
 671                 goto cleanup;
 672         }
 673
 674         info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 675
 676         spin_lock_irqsave(&info->netlock, flags);
 677         if (info->netcount) {
 678                 retval = -EBUSY;
 679                 spin_unlock_irqrestore(&info->netlock, flags);
 680                 goto cleanup;
 681         }
 682         info->port.count++;
 683         spin_unlock_irqrestore(&info->netlock, flags);
 684
 685         if (info->port.count == 1) {
 686                 /* 1st open on this device, init hardware */
 687                 retval = startup(info);
 688                 if (retval < 0)
 689                         goto cleanup;
 690         }
 691
 692         retval = block_til_ready(tty, filp, info);
 693         if (retval) {
 694                 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
 695                 goto cleanup;
 696         }
 697
 698         retval = 0;
 699
 700 cleanup:
 701         if (retval) {
 702                 if (tty->count == 1)
 703                         info->port.tty = NULL; /* tty layer will release tty struct */
 704                 if(info->port.count)
 705                         info->port.count--;
 706         }
 707
 708         DBGINFO(("%s open rc=%d\n", info->device_name, retval));
 709         return retval;
 710 }
 711
 712 static void close(struct tty_struct *tty, struct file *filp)
 713 {
 714         struct slgt_info *info = tty->driver_data;
 715
 716         if (sanity_check(info, tty->name, "close"))
 717                 return;
 718         DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
 719
 720         if (tty_port_close_start(&info->port, tty, filp) == 0)
 721                 goto cleanup;
 722
 723         if (info->port.flags & ASYNC_INITIALIZED)
 724                 wait_until_sent(tty, info->timeout);
 725         flush_buffer(tty);
 726         tty_ldisc_flush(tty);
 727
 728         shutdown(info);
 729
 730         tty_port_close_end(&info->port, tty);
 731         info->port.tty = NULL;
 732 cleanup:
 733         DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
 734 }
 735
 736 static void hangup(struct tty_struct *tty)
 737 {
 738         struct slgt_info *info = tty->driver_data;
 739
 740         if (sanity_check(info, tty->name, "hangup"))
 741                 return;
 742         DBGINFO(("%s hangup\n", info->device_name));
 743
 744         flush_buffer(tty);
 745         shutdown(info);
 746
 747         info->port.count = 0;
 748         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
 749         info->port.tty = NULL;
 750
 751         wake_up_interruptible(&info->port.open_wait);
 752 }
 753
 754 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 755 {
 756         struct slgt_info *info = tty->driver_data;
 757         unsigned long flags;
 758
 759         DBGINFO(("%s set_termios\n", tty->driver->name));
 760
 761         change_params(info);
 762
 763         /* Handle transition to B0 status */
 764         if (old_termios->c_cflag & CBAUD &&
 765             !(tty->termios->c_cflag & CBAUD)) {
 766                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 767                 spin_lock_irqsave(&info->lock,flags);
 768                 set_signals(info);
 769                 spin_unlock_irqrestore(&info->lock,flags);
 770         }
 771
 772         /* Handle transition away from B0 status */
 773         if (!(old_termios->c_cflag & CBAUD) &&
 774             tty->termios->c_cflag & CBAUD) {
 775                 info->signals |= SerialSignal_DTR;
 776                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 777                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 778                         info->signals |= SerialSignal_RTS;
 779                 }
 780                 spin_lock_irqsave(&info->lock,flags);
 781                 set_signals(info);
 782                 spin_unlock_irqrestore(&info->lock,flags);
 783         }
 784
 785         /* Handle turning off CRTSCTS */
 786         if (old_termios->c_cflag & CRTSCTS &&
 787             !(tty->termios->c_cflag & CRTSCTS)) {
 788                 tty->hw_stopped = 0;
 789                 tx_release(tty);
 790         }
 791 }
 792
 793 static int write(struct tty_struct *tty,
 794                  const unsigned char *buf, int count)
 795 {
 796         int ret = 0;
 797         struct slgt_info *info = tty->driver_data;
 798         unsigned long flags;
 799         unsigned int bufs_needed;
 800
 801         if (sanity_check(info, tty->name, "write"))
 802                 goto cleanup;
 803         DBGINFO(("%s write count=%d\n", info->device_name, count));
 804
 805         if (!info->tx_buf)
 806                 goto cleanup;
 807
 808         if (count > info->max_frame_size) {
 809                 ret = -EIO;
 810                 goto cleanup;
 811         }
 812
 813         if (!count)
 814                 goto cleanup;
 815
 816         if (!info->tx_active && info->tx_count) {
 817                 /* send accumulated data from send_char() */
 818                 tx_load(info, info->tx_buf, info->tx_count);
 819                 goto start;
 820         }
 821         bufs_needed = (count/DMABUFSIZE);
 822         if (count % DMABUFSIZE)
 823                 ++bufs_needed;
 824         if (bufs_needed > free_tbuf_count(info))
 825                 goto cleanup;
 826
 827         ret = info->tx_count = count;
 828         tx_load(info, buf, count);
 829         goto start;
 830
 831 start:
 832         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
 833                 spin_lock_irqsave(&info->lock,flags);
 834                 if (!info->tx_active)
 835                         tx_start(info);
 836                 else
 837                         tdma_start(info);
 838                 spin_unlock_irqrestore(&info->lock,flags);
 839         }
 840
 841 cleanup:
 842         DBGINFO(("%s write rc=%d\n", info->device_name, ret));
 843         return ret;
 844 }
 845
 846 static int put_char(struct tty_struct *tty, unsigned char ch)
 847 {
 848         struct slgt_info *info = tty->driver_data;
 849         unsigned long flags;
 850         int ret = 0;
 851
 852         if (sanity_check(info, tty->name, "put_char"))
 853                 return 0;
 854         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
 855         if (!info->tx_buf)
 856                 return 0;
 857         spin_lock_irqsave(&info->lock,flags);
 858         if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
 859                 info->tx_buf[info->tx_count++] = ch;
 860                 ret = 1;
 861         }
 862         spin_unlock_irqrestore(&info->lock,flags);
 863         return ret;
 864 }
 865
 866 static void send_xchar(struct tty_struct *tty, char ch)
 867 {
 868         struct slgt_info *info = tty->driver_data;
 869         unsigned long flags;
 870
 871         if (sanity_check(info, tty->name, "send_xchar"))
 872                 return;
 873         DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
 874         info->x_char = ch;
 875         if (ch) {
 876                 spin_lock_irqsave(&info->lock,flags);
 877                 if (!info->tx_enabled)
 878                         tx_start(info);
 879                 spin_unlock_irqrestore(&info->lock,flags);
 880         }
 881 }
 882
 883 static void wait_until_sent(struct tty_struct *tty, int timeout)
 884 {
 885         struct slgt_info *info = tty->driver_data;
 886         unsigned long orig_jiffies, char_time;
 887
 888         if (!info )
 889                 return;
 890         if (sanity_check(info, tty->name, "wait_until_sent"))
 891                 return;
 892         DBGINFO(("%s wait_until_sent entry\n", info->device_name));
 893         if (!(info->port.flags & ASYNC_INITIALIZED))
 894                 goto exit;
 895
 896         orig_jiffies = jiffies;
 897
 898         /* Set check interval to 1/5 of estimated time to
 899          * send a character, and make it at least 1. The check
 900          * interval should also be less than the timeout.
 901          * Note: use tight timings here to satisfy the NIST-PCTS.
 902          */
 903
 904         lock_kernel();
 905
 906         if (info->params.data_rate) {
 907                 char_time = info->timeout/(32 * 5);
 908                 if (!char_time)
 909                         char_time++;
 910         } else
 911                 char_time = 1;
 912
 913         if (timeout)
 914                 char_time = min_t(unsigned long, char_time, timeout);
 915
 916         while (info->tx_active) {
 917                 msleep_interruptible(jiffies_to_msecs(char_time));
 918                 if (signal_pending(current))
 919                         break;
 920                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
 921                         break;
 922         }
 923         unlock_kernel();
 924
 925 exit:
 926         DBGINFO(("%s wait_until_sent exit\n", info->device_name));
 927 }
 928
 929 static int write_room(struct tty_struct *tty)
 930 {
 931         struct slgt_info *info = tty->driver_data;
 932         int ret;
 933
 934         if (sanity_check(info, tty->name, "write_room"))
 935                 return 0;
 936         ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
 937         DBGINFO(("%s write_room=%d\n", info->device_name, ret));
 938         return ret;
 939 }
 940
 941 static void flush_chars(struct tty_struct *tty)
 942 {
 943         struct slgt_info *info = tty->driver_data;
 944         unsigned long flags;
 945
 946         if (sanity_check(info, tty->name, "flush_chars"))
 947                 return;
 948         DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
 949
 950         if (info->tx_count <= 0 || tty->stopped ||
 951             tty->hw_stopped || !info->tx_buf)
 952                 return;
 953
 954         DBGINFO(("%s flush_chars start transmit\n", info->device_name));
 955
 956         spin_lock_irqsave(&info->lock,flags);
 957         if (!info->tx_active && info->tx_count) {
 958                 tx_load(info, info->tx_buf,info->tx_count);
 959                 tx_start(info);
 960         }
 961         spin_unlock_irqrestore(&info->lock,flags);
 962 }
 963
 964 static void flush_buffer(struct tty_struct *tty)
 965 {
 966         struct slgt_info *info = tty->driver_data;
 967         unsigned long flags;
 968
 969         if (sanity_check(info, tty->name, "flush_buffer"))
 970                 return;
 971         DBGINFO(("%s flush_buffer\n", info->device_name));
 972
 973         spin_lock_irqsave(&info->lock,flags);
 974         if (!info->tx_active)
 975                 info->tx_count = 0;
 976         spin_unlock_irqrestore(&info->lock,flags);
 977
 978         tty_wakeup(tty);
 979 }
 980
 981 /*
 982  * throttle (stop) transmitter
 983  */
 984 static void tx_hold(struct tty_struct *tty)
 985 {
 986         struct slgt_info *info = tty->driver_data;
 987         unsigned long flags;
 988
 989         if (sanity_check(info, tty->name, "tx_hold"))
 990                 return;
 991         DBGINFO(("%s tx_hold\n", info->device_name));
 992         spin_lock_irqsave(&info->lock,flags);
 993         if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
 994                 tx_stop(info);
 995         spin_unlock_irqrestore(&info->lock,flags);
 996 }
 997
 998 /*
 999  * release (start) transmitter
1000  */
1001 static void tx_release(struct tty_struct *tty)
1002 {
1003         struct slgt_info *info = tty->driver_data;
1004         unsigned long flags;
1005
1006         if (sanity_check(info, tty->name, "tx_release"))
1007                 return;
1008         DBGINFO(("%s tx_release\n", info->device_name));
1009         spin_lock_irqsave(&info->lock,flags);
1010         if (!info->tx_active && info->tx_count) {
1011                 tx_load(info, info->tx_buf, info->tx_count);
1012                 tx_start(info);
1013         }
1014         spin_unlock_irqrestore(&info->lock,flags);
1015 }
1016
1017 /*
1018  * Service an IOCTL request
1019  *
1020  * Arguments
1021  *
1022  *      tty     pointer to tty instance data
1023  *      file    pointer to associated file object for device
1024  *      cmd     IOCTL command code
1025  *      arg     command argument/context
1026  *
1027  * Return 0 if success, otherwise error code
1028  */
1029 static int ioctl(struct tty_struct *tty, struct file *file,
1030                  unsigned int cmd, unsigned long arg)
1031 {
1032         struct slgt_info *info = tty->driver_data;
1033         struct mgsl_icount cnow;        /* kernel counter temps */
1034         struct serial_icounter_struct __user *p_cuser;  /* user space */
1035         unsigned long flags;
1036         void __user *argp = (void __user *)arg;
1037         int ret;
1038
1039         if (sanity_check(info, tty->name, "ioctl"))
1040                 return -ENODEV;
1041         DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1042
1043         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1044             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1045                 if (tty->flags & (1 << TTY_IO_ERROR))
1046                     return -EIO;
1047         }
1048
1049         lock_kernel();
1050
1051         switch (cmd) {
1052         case MGSL_IOCGPARAMS:
1053                 ret = get_params(info, argp);
1054                 break;
1055         case MGSL_IOCSPARAMS:
1056                 ret = set_params(info, argp);
1057                 break;
1058         case MGSL_IOCGTXIDLE:
1059                 ret = get_txidle(info, argp);
1060                 break;
1061         case MGSL_IOCSTXIDLE:
1062                 ret = set_txidle(info, (int)arg);
1063                 break;
1064         case MGSL_IOCTXENABLE:
1065                 ret = tx_enable(info, (int)arg);
1066                 break;
1067         case MGSL_IOCRXENABLE:
1068                 ret = rx_enable(info, (int)arg);
1069                 break;
1070         case MGSL_IOCTXABORT:
1071                 ret = tx_abort(info);
1072                 break;
1073         case MGSL_IOCGSTATS:
1074                 ret = get_stats(info, argp);
1075                 break;
1076         case MGSL_IOCWAITEVENT:
1077                 ret = wait_mgsl_event(info, argp);
1078                 break;
1079         case TIOCMIWAIT:
1080                 ret = modem_input_wait(info,(int)arg);
1081                 break;
1082         case MGSL_IOCGIF:
1083                 ret = get_interface(info, argp);
1084                 break;
1085         case MGSL_IOCSIF:
1086                 ret = set_interface(info,(int)arg);
1087                 break;
1088         case MGSL_IOCSGPIO:
1089                 ret = set_gpio(info, argp);
1090                 break;
1091         case MGSL_IOCGGPIO:
1092                 ret = get_gpio(info, argp);
1093                 break;
1094         case MGSL_IOCWAITGPIO:
1095                 ret = wait_gpio(info, argp);
1096                 break;
1097         case TIOCGICOUNT:
1098                 spin_lock_irqsave(&info->lock,flags);
1099                 cnow = info->icount;
1100                 spin_unlock_irqrestore(&info->lock,flags);
1101                 p_cuser = argp;
1102                 if (put_user(cnow.cts, &p_cuser->cts) ||
1103                     put_user(cnow.dsr, &p_cuser->dsr) ||
1104                     put_user(cnow.rng, &p_cuser->rng) ||
1105                     put_user(cnow.dcd, &p_cuser->dcd) ||
1106                     put_user(cnow.rx, &p_cuser->rx) ||
1107                     put_user(cnow.tx, &p_cuser->tx) ||
1108                     put_user(cnow.frame, &p_cuser->frame) ||
1109                     put_user(cnow.overrun, &p_cuser->overrun) ||
1110                     put_user(cnow.parity, &p_cuser->parity) ||
1111                     put_user(cnow.brk, &p_cuser->brk) ||
1112                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1113                         ret = -EFAULT;
1114                 ret = 0;
1115                 break;
1116         default:
1117                 ret = -ENOIOCTLCMD;
1118         }
1119         unlock_kernel();
1120         return ret;
1121 }
1122
1123 /*
1124  * support for 32 bit ioctl calls on 64 bit systems
1125  */
1126 #ifdef CONFIG_COMPAT
1127 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1128 {
1129         struct MGSL_PARAMS32 tmp_params;
1130
1131         DBGINFO(("%s get_params32\n", info->device_name));
1132         tmp_params.mode            = (compat_ulong_t)info->params.mode;
1133         tmp_params.loopback        = info->params.loopback;
1134         tmp_params.flags           = info->params.flags;
1135         tmp_params.encoding        = info->params.encoding;
1136         tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
1137         tmp_params.addr_filter     = info->params.addr_filter;
1138         tmp_params.crc_type        = info->params.crc_type;
1139         tmp_params.preamble_length = info->params.preamble_length;
1140         tmp_params.preamble        = info->params.preamble;
1141         tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
1142         tmp_params.data_bits       = info->params.data_bits;
1143         tmp_params.stop_bits       = info->params.stop_bits;
1144         tmp_params.parity          = info->params.parity;
1145         if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1146                 return -EFAULT;
1147         return 0;
1148 }
1149
1150 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1151 {
1152         struct MGSL_PARAMS32 tmp_params;
1153
1154         DBGINFO(("%s set_params32\n", info->device_name));
1155         if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1156                 return -EFAULT;
1157
1158         spin_lock(&info->lock);
1159         info->params.mode            = tmp_params.mode;
1160         info->params.loopback        = tmp_params.loopback;
1161         info->params.flags           = tmp_params.flags;
1162         info->params.encoding        = tmp_params.encoding;
1163         info->params.clock_speed     = tmp_params.clock_speed;
1164         info->params.addr_filter     = tmp_params.addr_filter;
1165         info->params.crc_type        = tmp_params.crc_type;
1166         info->params.preamble_length = tmp_params.preamble_length;
1167         info->params.preamble        = tmp_params.preamble;
1168         info->params.data_rate       = tmp_params.data_rate;
1169         info->params.data_bits       = tmp_params.data_bits;
1170         info->params.stop_bits       = tmp_params.stop_bits;
1171         info->params.parity          = tmp_params.parity;
1172         spin_unlock(&info->lock);
1173
1174         change_params(info);
1175
1176         return 0;
1177 }
1178
1179 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1180                          unsigned int cmd, unsigned long arg)
1181 {
1182         struct slgt_info *info = tty->driver_data;
1183         int rc = -ENOIOCTLCMD;
1184
1185         if (sanity_check(info, tty->name, "compat_ioctl"))
1186                 return -ENODEV;
1187         DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1188
1189         switch (cmd) {
1190
1191         case MGSL_IOCSPARAMS32:
1192                 rc = set_params32(info, compat_ptr(arg));
1193                 break;
1194
1195         case MGSL_IOCGPARAMS32:
1196                 rc = get_params32(info, compat_ptr(arg));
1197                 break;
1198
1199         case MGSL_IOCGPARAMS:
1200         case MGSL_IOCSPARAMS:
1201         case MGSL_IOCGTXIDLE:
1202         case MGSL_IOCGSTATS:
1203         case MGSL_IOCWAITEVENT:
1204         case MGSL_IOCGIF:
1205         case MGSL_IOCSGPIO:
1206         case MGSL_IOCGGPIO:
1207         case MGSL_IOCWAITGPIO:
1208         case TIOCGICOUNT:
1209                 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1210                 break;
1211
1212         case MGSL_IOCSTXIDLE:
1213         case MGSL_IOCTXENABLE:
1214         case MGSL_IOCRXENABLE:
1215         case MGSL_IOCTXABORT:
1216         case TIOCMIWAIT:
1217         case MGSL_IOCSIF:
1218                 rc = ioctl(tty, file, cmd, arg);
1219                 break;
1220         }
1221
1222         DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1223         return rc;
1224 }
1225 #else
1226 #define slgt_compat_ioctl NULL
1227 #endif /* ifdef CONFIG_COMPAT */
1228
1229 /*
1230  * proc fs support
1231  */
1232 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1233 {
1234         char stat_buf[30];
1235         unsigned long flags;
1236
1237         seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1238                       info->device_name, info->phys_reg_addr,
1239                       info->irq_level, info->max_frame_size);
1240
1241         /* output current serial signal states */
1242         spin_lock_irqsave(&info->lock,flags);
1243         get_signals(info);
1244         spin_unlock_irqrestore(&info->lock,flags);
1245
1246         stat_buf[0] = 0;
1247         stat_buf[1] = 0;
1248         if (info->signals & SerialSignal_RTS)
1249                 strcat(stat_buf, "|RTS");
1250         if (info->signals & SerialSignal_CTS)
1251                 strcat(stat_buf, "|CTS");
1252         if (info->signals & SerialSignal_DTR)
1253                 strcat(stat_buf, "|DTR");
1254         if (info->signals & SerialSignal_DSR)
1255                 strcat(stat_buf, "|DSR");
1256         if (info->signals & SerialSignal_DCD)
1257                 strcat(stat_buf, "|CD");
1258         if (info->signals & SerialSignal_RI)
1259                 strcat(stat_buf, "|RI");
1260
1261         if (info->params.mode != MGSL_MODE_ASYNC) {
1262                 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1263                                info->icount.txok, info->icount.rxok);
1264                 if (info->icount.txunder)
1265                         seq_printf(m, " txunder:%d", info->icount.txunder);
1266                 if (info->icount.txabort)
1267                         seq_printf(m, " txabort:%d", info->icount.txabort);
1268                 if (info->icount.rxshort)
1269                         seq_printf(m, " rxshort:%d", info->icount.rxshort);
1270                 if (info->icount.rxlong)
1271                         seq_printf(m, " rxlong:%d", info->icount.rxlong);
1272                 if (info->icount.rxover)
1273                         seq_printf(m, " rxover:%d", info->icount.rxover);
1274                 if (info->icount.rxcrc)
1275                         seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1276         } else {
1277                 seq_printf(m, "\tASYNC tx:%d rx:%d",
1278                                info->icount.tx, info->icount.rx);
1279                 if (info->icount.frame)
1280                         seq_printf(m, " fe:%d", info->icount.frame);
1281                 if (info->icount.parity)
1282                         seq_printf(m, " pe:%d", info->icount.parity);
1283                 if (info->icount.brk)
1284                         seq_printf(m, " brk:%d", info->icount.brk);
1285                 if (info->icount.overrun)
1286                         seq_printf(m, " oe:%d", info->icount.overrun);
1287         }
1288
1289         /* Append serial signal status to end */
1290         seq_printf(m, " %s\n", stat_buf+1);
1291
1292         seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1293                        info->tx_active,info->bh_requested,info->bh_running,
1294                        info->pending_bh);
1295 }
1296
1297 /* Called to print information about devices
1298  */
1299 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1300 {
1301         struct slgt_info *info;
1302
1303         seq_puts(m, "synclink_gt driver\n");
1304
1305         info = slgt_device_list;
1306         while( info ) {
1307                 line_info(m, info);
1308                 info = info->next_device;
1309         }
1310         return 0;
1311 }
1312
1313 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1314 {
1315         return single_open(file, synclink_gt_proc_show, NULL);
1316 }
1317
1318 static const struct file_operations synclink_gt_proc_fops = {
1319         .owner          = THIS_MODULE,
1320         .open           = synclink_gt_proc_open,
1321         .read           = seq_read,
1322         .llseek         = seq_lseek,
1323         .release        = single_release,
1324 };
1325
1326 /*
1327  * return count of bytes in transmit buffer
1328  */
1329 static int chars_in_buffer(struct tty_struct *tty)
1330 {
1331         struct slgt_info *info = tty->driver_data;
1332         int count;
1333         if (sanity_check(info, tty->name, "chars_in_buffer"))
1334                 return 0;
1335         count = tbuf_bytes(info);
1336         DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1337         return count;
1338 }
1339
1340 /*
1341  * signal remote device to throttle send data (our receive data)
1342  */
1343 static void throttle(struct tty_struct * tty)
1344 {
1345         struct slgt_info *info = tty->driver_data;
1346         unsigned long flags;
1347
1348         if (sanity_check(info, tty->name, "throttle"))
1349                 return;
1350         DBGINFO(("%s throttle\n", info->device_name));
1351         if (I_IXOFF(tty))
1352                 send_xchar(tty, STOP_CHAR(tty));
1353         if (tty->termios->c_cflag & CRTSCTS) {
1354                 spin_lock_irqsave(&info->lock,flags);
1355                 info->signals &= ~SerialSignal_RTS;
1356                 set_signals(info);
1357                 spin_unlock_irqrestore(&info->lock,flags);
1358         }
1359 }
1360
1361 /*
1362  * signal remote device to stop throttling send data (our receive data)
1363  */
1364 static void unthrottle(struct tty_struct * tty)
1365 {
1366         struct slgt_info *info = tty->driver_data;
1367         unsigned long flags;
1368
1369         if (sanity_check(info, tty->name, "unthrottle"))
1370                 return;
1371         DBGINFO(("%s unthrottle\n", info->device_name));
1372         if (I_IXOFF(tty)) {
1373                 if (info->x_char)
1374                         info->x_char = 0;
1375                 else
1376                         send_xchar(tty, START_CHAR(tty));
1377         }
1378         if (tty->termios->c_cflag & CRTSCTS) {
1379                 spin_lock_irqsave(&info->lock,flags);
1380                 info->signals |= SerialSignal_RTS;
1381                 set_signals(info);
1382                 spin_unlock_irqrestore(&info->lock,flags);
1383         }
1384 }
1385
1386 /*
1387  * set or clear transmit break condition
1388  * break_state  -1=set break condition, 0=clear
1389  */
1390 static int set_break(struct tty_struct *tty, int break_state)
1391 {
1392         struct slgt_info *info = tty->driver_data;
1393         unsigned short value;
1394         unsigned long flags;
1395
1396         if (sanity_check(info, tty->name, "set_break"))
1397                 return -EINVAL;
1398         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1399
1400         spin_lock_irqsave(&info->lock,flags);
1401         value = rd_reg16(info, TCR);
1402         if (break_state == -1)
1403                 value |= BIT6;
1404         else
1405                 value &= ~BIT6;
1406         wr_reg16(info, TCR, value);
1407         spin_unlock_irqrestore(&info->lock,flags);
1408         return 0;
1409 }
1410
1411 #if SYNCLINK_GENERIC_HDLC
1412
1413 /**
1414  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1415  * set encoding and frame check sequence (FCS) options
1416  *
1417  * dev       pointer to network device structure
1418  * encoding  serial encoding setting
1419  * parity    FCS setting
1420  *
1421  * returns 0 if success, otherwise error code
1422  */
1423 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1424                           unsigned short parity)
1425 {
1426         struct slgt_info *info = dev_to_port(dev);
1427         unsigned char  new_encoding;
1428         unsigned short new_crctype;
1429
1430         /* return error if TTY interface open */
1431         if (info->port.count)
1432                 return -EBUSY;
1433
1434         DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1435
1436         switch (encoding)
1437         {
1438         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1439         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1440         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1441         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1442         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1443         default: return -EINVAL;
1444         }
1445
1446         switch (parity)
1447         {
1448         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1449         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1450         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1451         default: return -EINVAL;
1452         }
1453
1454         info->params.encoding = new_encoding;
1455         info->params.crc_type = new_crctype;
1456
1457         /* if network interface up, reprogram hardware */
1458         if (info->netcount)
1459                 program_hw(info);
1460
1461         return 0;
1462 }
1463
1464 /**
1465  * called by generic HDLC layer to send frame
1466  *
1467  * skb  socket buffer containing HDLC frame
1468  * dev  pointer to network device structure
1469  *
1470  * returns 0 if success, otherwise error code
1471  */
1472 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1473 {
1474         struct slgt_info *info = dev_to_port(dev);
1475         unsigned long flags;
1476
1477         DBGINFO(("%s hdlc_xmit\n", dev->name));
1478
1479         /* stop sending until this frame completes */
1480         netif_stop_queue(dev);
1481
1482         /* copy data to device buffers */
1483         info->tx_count = skb->len;
1484         tx_load(info, skb->data, skb->len);
1485
1486         /* update network statistics */
1487         dev->stats.tx_packets++;
1488         dev->stats.tx_bytes += skb->len;
1489
1490         /* done with socket buffer, so free it */
1491         dev_kfree_skb(skb);
1492
1493         /* save start time for transmit timeout detection */
1494         dev->trans_start = jiffies;
1495
1496         /* start hardware transmitter if necessary */
1497         spin_lock_irqsave(&info->lock,flags);
1498         if (!info->tx_active)
1499                 tx_start(info);
1500         spin_unlock_irqrestore(&info->lock,flags);
1501
1502         return 0;
1503 }
1504
1505 /**
1506  * called by network layer when interface enabled
1507  * claim resources and initialize hardware
1508  *
1509  * dev  pointer to network device structure
1510  *
1511  * returns 0 if success, otherwise error code
1512  */
1513 static int hdlcdev_open(struct net_device *dev)
1514 {
1515         struct slgt_info *info = dev_to_port(dev);
1516         int rc;
1517         unsigned long flags;
1518
1519         if (!try_module_get(THIS_MODULE))
1520                 return -EBUSY;
1521
1522         DBGINFO(("%s hdlcdev_open\n", dev->name));
1523
1524         /* generic HDLC layer open processing */
1525         if ((rc = hdlc_open(dev)))
1526                 return rc;
1527
1528         /* arbitrate between network and tty opens */
1529         spin_lock_irqsave(&info->netlock, flags);
1530         if (info->port.count != 0 || info->netcount != 0) {
1531                 DBGINFO(("%s hdlc_open busy\n", dev->name));
1532                 spin_unlock_irqrestore(&info->netlock, flags);
1533                 return -EBUSY;
1534         }
1535         info->netcount=1;
1536         spin_unlock_irqrestore(&info->netlock, flags);
1537
1538         /* claim resources and init adapter */
1539         if ((rc = startup(info)) != 0) {
1540                 spin_lock_irqsave(&info->netlock, flags);
1541                 info->netcount=0;
1542                 spin_unlock_irqrestore(&info->netlock, flags);
1543                 return rc;
1544         }
1545
1546         /* assert DTR and RTS, apply hardware settings */
1547         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1548         program_hw(info);
1549
1550         /* enable network layer transmit */
1551         dev->trans_start = jiffies;
1552         netif_start_queue(dev);
1553
1554         /* inform generic HDLC layer of current DCD status */
1555         spin_lock_irqsave(&info->lock, flags);
1556         get_signals(info);
1557         spin_unlock_irqrestore(&info->lock, flags);
1558         if (info->signals & SerialSignal_DCD)
1559                 netif_carrier_on(dev);
1560         else
1561                 netif_carrier_off(dev);
1562         return 0;
1563 }
1564
1565 /**
1566  * called by network layer when interface is disabled
1567  * shutdown hardware and release resources
1568  *
1569  * dev  pointer to network device structure
1570  *
1571  * returns 0 if success, otherwise error code
1572  */
1573 static int hdlcdev_close(struct net_device *dev)
1574 {
1575         struct slgt_info *info = dev_to_port(dev);
1576         unsigned long flags;
1577
1578         DBGINFO(("%s hdlcdev_close\n", dev->name));
1579
1580         netif_stop_queue(dev);
1581
1582         /* shutdown adapter and release resources */
1583         shutdown(info);
1584
1585         hdlc_close(dev);
1586
1587         spin_lock_irqsave(&info->netlock, flags);
1588         info->netcount=0;
1589         spin_unlock_irqrestore(&info->netlock, flags);
1590
1591         module_put(THIS_MODULE);
1592         return 0;
1593 }
1594
1595 /**
1596  * called by network layer to process IOCTL call to network device
1597  *
1598  * dev  pointer to network device structure
1599  * ifr  pointer to network interface request structure
1600  * cmd  IOCTL command code
1601  *
1602  * returns 0 if success, otherwise error code
1603  */
1604 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1605 {
1606         const size_t size = sizeof(sync_serial_settings);
1607         sync_serial_settings new_line;
1608         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1609         struct slgt_info *info = dev_to_port(dev);
1610         unsigned int flags;
1611
1612         DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1613
1614         /* return error if TTY interface open */
1615         if (info->port.count)
1616                 return -EBUSY;
1617
1618         if (cmd != SIOCWANDEV)
1619                 return hdlc_ioctl(dev, ifr, cmd);
1620
1621         switch(ifr->ifr_settings.type) {
1622         case IF_GET_IFACE: /* return current sync_serial_settings */
1623
1624                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1625                 if (ifr->ifr_settings.size < size) {
1626                         ifr->ifr_settings.size = size; /* data size wanted */
1627                         return -ENOBUFS;
1628                 }
1629
1630                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1631                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1632                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1633                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1634
1635                 switch (flags){
1636                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1637                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1638                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1639                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1640                 default: new_line.clock_type = CLOCK_DEFAULT;
1641                 }
1642
1643                 new_line.clock_rate = info->params.clock_speed;
1644                 new_line.loopback   = info->params.loopback ? 1:0;
1645
1646                 if (copy_to_user(line, &new_line, size))
1647                         return -EFAULT;
1648                 return 0;
1649
1650         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1651
1652                 if(!capable(CAP_NET_ADMIN))
1653                         return -EPERM;
1654                 if (copy_from_user(&new_line, line, size))
1655                         return -EFAULT;
1656
1657                 switch (new_line.clock_type)
1658                 {
1659                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1660                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1661                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1662                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1663                 case CLOCK_DEFAULT:  flags = info->params.flags &
1664                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1665                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1666                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1667                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1668                 default: return -EINVAL;
1669                 }
1670
1671                 if (new_line.loopback != 0 && new_line.loopback != 1)
1672                         return -EINVAL;
1673
1674                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1675                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1676                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1677                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1678                 info->params.flags |= flags;
1679
1680                 info->params.loopback = new_line.loopback;
1681
1682                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1683                         info->params.clock_speed = new_line.clock_rate;
1684                 else
1685                         info->params.clock_speed = 0;
1686
1687                 /* if network interface up, reprogram hardware */
1688                 if (info->netcount)
1689                         program_hw(info);
1690                 return 0;
1691
1692         default:
1693                 return hdlc_ioctl(dev, ifr, cmd);
1694         }
1695 }
1696
1697 /**
1698  * called by network layer when transmit timeout is detected
1699  *
1700  * dev  pointer to network device structure
1701  */
1702 static void hdlcdev_tx_timeout(struct net_device *dev)
1703 {
1704         struct slgt_info *info = dev_to_port(dev);
1705         unsigned long flags;
1706
1707         DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1708
1709         dev->stats.tx_errors++;
1710         dev->stats.tx_aborted_errors++;
1711
1712         spin_lock_irqsave(&info->lock,flags);
1713         tx_stop(info);
1714         spin_unlock_irqrestore(&info->lock,flags);
1715
1716         netif_wake_queue(dev);
1717 }
1718
1719 /**
1720  * called by device driver when transmit completes
1721  * reenable network layer transmit if stopped
1722  *
1723  * info  pointer to device instance information
1724  */
1725 static void hdlcdev_tx_done(struct slgt_info *info)
1726 {
1727         if (netif_queue_stopped(info->netdev))
1728                 netif_wake_queue(info->netdev);
1729 }
1730
1731 /**
1732  * called by device driver when frame received
1733  * pass frame to network layer
1734  *
1735  * info  pointer to device instance information
1736  * buf   pointer to buffer contianing frame data
1737  * size  count of data bytes in buf
1738  */
1739 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1740 {
1741         struct sk_buff *skb = dev_alloc_skb(size);
1742         struct net_device *dev = info->netdev;
1743
1744         DBGINFO(("%s hdlcdev_rx\n", dev->name));
1745
1746         if (skb == NULL) {
1747                 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1748                 dev->stats.rx_dropped++;
1749                 return;
1750         }
1751
1752         memcpy(skb_put(skb, size), buf, size);
1753
1754         skb->protocol = hdlc_type_trans(skb, dev);
1755
1756         dev->stats.rx_packets++;
1757         dev->stats.rx_bytes += size;
1758
1759         netif_rx(skb);
1760 }
1761
1762 static const struct net_device_ops hdlcdev_ops = {
1763         .ndo_open       = hdlcdev_open,
1764         .ndo_stop       = hdlcdev_close,
1765         .ndo_change_mtu = hdlc_change_mtu,
1766         .ndo_start_xmit = hdlc_start_xmit,
1767         .ndo_do_ioctl   = hdlcdev_ioctl,
1768         .ndo_tx_timeout = hdlcdev_tx_timeout,
1769 };
1770
1771 /**
1772  * called by device driver when adding device instance
1773  * do generic HDLC initialization
1774  *
1775  * info  pointer to device instance information
1776  *
1777  * returns 0 if success, otherwise error code
1778  */
1779 static int hdlcdev_init(struct slgt_info *info)
1780 {
1781         int rc;
1782         struct net_device *dev;
1783         hdlc_device *hdlc;
1784
1785         /* allocate and initialize network and HDLC layer objects */
1786
1787         if (!(dev = alloc_hdlcdev(info))) {
1788                 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1789                 return -ENOMEM;
1790         }
1791
1792         /* for network layer reporting purposes only */
1793         dev->mem_start = info->phys_reg_addr;
1794         dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1795         dev->irq       = info->irq_level;
1796
1797         /* network layer callbacks and settings */
1798         dev->netdev_ops     = &hdlcdev_ops;
1799         dev->watchdog_timeo = 10 * HZ;
1800         dev->tx_queue_len   = 50;
1801
1802         /* generic HDLC layer callbacks and settings */
1803         hdlc         = dev_to_hdlc(dev);
1804         hdlc->attach = hdlcdev_attach;
1805         hdlc->xmit   = hdlcdev_xmit;
1806
1807         /* register objects with HDLC layer */
1808         if ((rc = register_hdlc_device(dev))) {
1809                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1810                 free_netdev(dev);
1811                 return rc;
1812         }
1813
1814         info->netdev = dev;
1815         return 0;
1816 }
1817
1818 /**
1819  * called by device driver when removing device instance
1820  * do generic HDLC cleanup
1821  *
1822  * info  pointer to device instance information
1823  */
1824 static void hdlcdev_exit(struct slgt_info *info)
1825 {
1826         unregister_hdlc_device(info->netdev);
1827         free_netdev(info->netdev);
1828         info->netdev = NULL;
1829 }
1830
1831 #endif /* ifdef CONFIG_HDLC */
1832
1833 /*
1834  * get async data from rx DMA buffers
1835  */
1836 static void rx_async(struct slgt_info *info)
1837 {
1838         struct tty_struct *tty = info->port.tty;
1839         struct mgsl_icount *icount = &info->icount;
1840         unsigned int start, end;
1841         unsigned char *p;
1842         unsigned char status;
1843         struct slgt_desc *bufs = info->rbufs;
1844         int i, count;
1845         int chars = 0;
1846         int stat;
1847         unsigned char ch;
1848
1849         start = end = info->rbuf_current;
1850
1851         while(desc_complete(bufs[end])) {
1852                 count = desc_count(bufs[end]) - info->rbuf_index;
1853                 p     = bufs[end].buf + info->rbuf_index;
1854
1855                 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1856                 DBGDATA(info, p, count, "rx");
1857
1858                 for(i=0 ; i < count; i+=2, p+=2) {
1859                         ch = *p;
1860                         icount->rx++;
1861
1862                         stat = 0;
1863
1864                         if ((status = *(p+1) & (BIT1 + BIT0))) {
1865                                 if (status & BIT1)
1866                                         icount->parity++;
1867                                 else if (status & BIT0)
1868                                         icount->frame++;
1869                                 /* discard char if tty control flags say so */
1870                                 if (status & info->ignore_status_mask)
1871                                         continue;
1872                                 if (status & BIT1)
1873                                         stat = TTY_PARITY;
1874                                 else if (status & BIT0)
1875                                         stat = TTY_FRAME;
1876                         }
1877                         if (tty) {
1878                                 tty_insert_flip_char(tty, ch, stat);
1879                                 chars++;
1880                         }
1881                 }
1882
1883                 if (i < count) {
1884                         /* receive buffer not completed */
1885                         info->rbuf_index += i;
1886                         mod_timer(&info->rx_timer, jiffies + 1);
1887                         break;
1888                 }
1889
1890                 info->rbuf_index = 0;
1891                 free_rbufs(info, end, end);
1892
1893                 if (++end == info->rbuf_count)
1894                         end = 0;
1895
1896                 /* if entire list searched then no frame available */
1897                 if (end == start)
1898                         break;
1899         }
1900
1901         if (tty && chars)
1902                 tty_flip_buffer_push(tty);
1903 }
1904
1905 /*
1906  * return next bottom half action to perform
1907  */
1908 static int bh_action(struct slgt_info *info)
1909 {
1910         unsigned long flags;
1911         int rc;
1912
1913         spin_lock_irqsave(&info->lock,flags);
1914
1915         if (info->pending_bh & BH_RECEIVE) {
1916                 info->pending_bh &= ~BH_RECEIVE;
1917                 rc = BH_RECEIVE;
1918         } else if (info->pending_bh & BH_TRANSMIT) {
1919                 info->pending_bh &= ~BH_TRANSMIT;
1920                 rc = BH_TRANSMIT;
1921         } else if (info->pending_bh & BH_STATUS) {
1922                 info->pending_bh &= ~BH_STATUS;
1923                 rc = BH_STATUS;
1924         } else {
1925                 /* Mark BH routine as complete */
1926                 info->bh_running = false;
1927                 info->bh_requested = false;
1928                 rc = 0;
1929         }
1930
1931         spin_unlock_irqrestore(&info->lock,flags);
1932
1933         return rc;
1934 }
1935
1936 /*
1937  * perform bottom half processing
1938  */
1939 static void bh_handler(struct work_struct *work)
1940 {
1941         struct slgt_info *info = container_of(work, struct slgt_info, task);
1942         int action;
1943
1944         if (!info)
1945                 return;
1946         info->bh_running = true;
1947
1948         while((action = bh_action(info))) {
1949                 switch (action) {
1950                 case BH_RECEIVE:
1951                         DBGBH(("%s bh receive\n", info->device_name));
1952                         switch(info->params.mode) {
1953                         case MGSL_MODE_ASYNC:
1954                                 rx_async(info);
1955                                 break;
1956                         case MGSL_MODE_HDLC:
1957                                 while(rx_get_frame(info));
1958                                 break;
1959                         case MGSL_MODE_RAW:
1960                         case MGSL_MODE_MONOSYNC:
1961                         case MGSL_MODE_BISYNC:
1962                                 while(rx_get_buf(info));
1963                                 break;
1964                         }
1965                         /* restart receiver if rx DMA buffers exhausted */
1966                         if (info->rx_restart)
1967                                 rx_start(info);
1968                         break;
1969                 case BH_TRANSMIT:
1970                         bh_transmit(info);
1971                         break;
1972                 case BH_STATUS:
1973                         DBGBH(("%s bh status\n", info->device_name));
1974                         info->ri_chkcount = 0;
1975                         info->dsr_chkcount = 0;
1976                         info->dcd_chkcount = 0;
1977                         info->cts_chkcount = 0;
1978                         break;
1979                 default:
1980                         DBGBH(("%s unknown action\n", info->device_name));
1981                         break;
1982                 }
1983         }
1984         DBGBH(("%s bh_handler exit\n", info->device_name));
1985 }
1986
1987 static void bh_transmit(struct slgt_info *info)
1988 {
1989         struct tty_struct *tty = info->port.tty;
1990
1991         DBGBH(("%s bh_transmit\n", info->device_name));
1992         if (tty)
1993                 tty_wakeup(tty);
1994 }
1995
1996 static void dsr_change(struct slgt_info *info, unsigned short status)
1997 {
1998         if (status & BIT3) {
1999                 info->signals |= SerialSignal_DSR;
2000                 info->input_signal_events.dsr_up++;
2001         } else {
2002                 info->signals &= ~SerialSignal_DSR;
2003                 info->input_signal_events.dsr_down++;
2004         }
2005         DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2006         if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2007                 slgt_irq_off(info, IRQ_DSR);
2008                 return;
2009         }
2010         info->icount.dsr++;
2011         wake_up_interruptible(&info->status_event_wait_q);
2012         wake_up_interruptible(&info->event_wait_q);
2013         info->pending_bh |= BH_STATUS;
2014 }
2015
2016 static void cts_change(struct slgt_info *info, unsigned short status)
2017 {
2018         if (status & BIT2) {
2019                 info->signals |= SerialSignal_CTS;
2020                 info->input_signal_events.cts_up++;
2021         } else {
2022                 info->signals &= ~SerialSignal_CTS;
2023                 info->input_signal_events.cts_down++;
2024         }
2025         DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2026         if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2027                 slgt_irq_off(info, IRQ_CTS);
2028                 return;
2029         }
2030         info->icount.cts++;
2031         wake_up_interruptible(&info->status_event_wait_q);
2032         wake_up_interruptible(&info->event_wait_q);
2033         info->pending_bh |= BH_STATUS;
2034
2035         if (info->port.flags & ASYNC_CTS_FLOW) {
2036                 if (info->port.tty) {
2037                         if (info->port.tty->hw_stopped) {
2038                                 if (info->signals & SerialSignal_CTS) {
2039                                         info->port.tty->hw_stopped = 0;
2040                                         info->pending_bh |= BH_TRANSMIT;
2041                                         return;
2042                                 }
2043                         } else {
2044                                 if (!(info->signals & SerialSignal_CTS))
2045                                         info->port.tty->hw_stopped = 1;
2046                         }
2047                 }
2048         }
2049 }
2050
2051 static void dcd_change(struct slgt_info *info, unsigned short status)
2052 {
2053         if (status & BIT1) {
2054                 info->signals |= SerialSignal_DCD;
2055                 info->input_signal_events.dcd_up++;
2056         } else {
2057                 info->signals &= ~SerialSignal_DCD;
2058                 info->input_signal_events.dcd_down++;
2059         }
2060         DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2061         if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2062                 slgt_irq_off(info, IRQ_DCD);
2063                 return;
2064         }
2065         info->icount.dcd++;
2066 #if SYNCLINK_GENERIC_HDLC
2067         if (info->netcount) {
2068                 if (info->signals & SerialSignal_DCD)
2069                         netif_carrier_on(info->netdev);
2070                 else
2071                         netif_carrier_off(info->netdev);
2072         }
2073 #endif
2074         wake_up_interruptible(&info->status_event_wait_q);
2075         wake_up_interruptible(&info->event_wait_q);
2076         info->pending_bh |= BH_STATUS;
2077
2078         if (info->port.flags & ASYNC_CHECK_CD) {
2079                 if (info->signals & SerialSignal_DCD)
2080                         wake_up_interruptible(&info->port.open_wait);
2081                 else {
2082                         if (info->port.tty)
2083                                 tty_hangup(info->port.tty);
2084                 }
2085         }
2086 }
2087
2088 static void ri_change(struct slgt_info *info, unsigned short status)
2089 {
2090         if (status & BIT0) {
2091                 info->signals |= SerialSignal_RI;
2092                 info->input_signal_events.ri_up++;
2093         } else {
2094                 info->signals &= ~SerialSignal_RI;
2095                 info->input_signal_events.ri_down++;
2096         }
2097         DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2098         if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2099                 slgt_irq_off(info, IRQ_RI);
2100                 return;
2101         }
2102         info->icount.rng++;
2103         wake_up_interruptible(&info->status_event_wait_q);
2104         wake_up_interruptible(&info->event_wait_q);
2105         info->pending_bh |= BH_STATUS;
2106 }
2107
2108 static void isr_serial(struct slgt_info *info)
2109 {
2110         unsigned short status = rd_reg16(info, SSR);
2111
2112         DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2113
2114         wr_reg16(info, SSR, status); /* clear pending */
2115
2116         info->irq_occurred = true;
2117
2118         if (info->params.mode == MGSL_MODE_ASYNC) {
2119                 if (status & IRQ_TXIDLE) {
2120                         if (info->tx_count)
2121                                 isr_txeom(info, status);
2122                 }
2123                 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2124                         info->icount.brk++;
2125                         /* process break detection if tty control allows */
2126                         if (info->port.tty) {
2127                                 if (!(status & info->ignore_status_mask)) {
2128                                         if (info->read_status_mask & MASK_BREAK) {
2129                                                 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2130                                                 if (info->port.flags & ASYNC_SAK)
2131                                                         do_SAK(info->port.tty);
2132                                         }
2133                                 }
2134                         }
2135                 }
2136         } else {
2137                 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2138                         isr_txeom(info, status);
2139
2140                 if (status & IRQ_RXIDLE) {
2141                         if (status & RXIDLE)
2142                                 info->icount.rxidle++;
2143                         else
2144                                 info->icount.exithunt++;
2145                         wake_up_interruptible(&info->event_wait_q);
2146                 }
2147
2148                 if (status & IRQ_RXOVER)
2149                         rx_start(info);
2150         }
2151
2152         if (status & IRQ_DSR)
2153                 dsr_change(info, status);
2154         if (status & IRQ_CTS)
2155                 cts_change(info, status);
2156         if (status & IRQ_DCD)
2157                 dcd_change(info, status);
2158         if (status & IRQ_RI)
2159                 ri_change(info, status);
2160 }
2161
2162 static void isr_rdma(struct slgt_info *info)
2163 {
2164         unsigned int status = rd_reg32(info, RDCSR);
2165
2166         DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2167
2168         /* RDCSR (rx DMA control/status)
2169          *
2170          * 31..07  reserved
2171          * 06      save status byte to DMA buffer
2172          * 05      error
2173          * 04      eol (end of list)
2174          * 03      eob (end of buffer)
2175          * 02      IRQ enable
2176          * 01      reset
2177          * 00      enable
2178          */
2179         wr_reg32(info, RDCSR, status);  /* clear pending */
2180
2181         if (status & (BIT5 + BIT4)) {
2182                 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2183                 info->rx_restart = true;
2184         }
2185         info->pending_bh |= BH_RECEIVE;
2186 }
2187
2188 static void isr_tdma(struct slgt_info *info)
2189 {
2190         unsigned int status = rd_reg32(info, TDCSR);
2191
2192         DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2193
2194         /* TDCSR (tx DMA control/status)
2195          *
2196          * 31..06  reserved
2197          * 05      error
2198          * 04      eol (end of list)
2199          * 03      eob (end of buffer)
2200          * 02      IRQ enable
2201          * 01      reset
2202          * 00      enable
2203          */
2204         wr_reg32(info, TDCSR, status);  /* clear pending */
2205
2206         if (status & (BIT5 + BIT4 + BIT3)) {
2207                 // another transmit buffer has completed
2208                 // run bottom half to get more send data from user
2209                 info->pending_bh |= BH_TRANSMIT;
2210         }
2211 }
2212
2213 static void isr_txeom(struct slgt_info *info, unsigned short status)
2214 {
2215         DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2216
2217         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2218         tdma_reset(info);
2219         reset_tbufs(info);
2220         if (status & IRQ_TXUNDER) {
2221                 unsigned short val = rd_reg16(info, TCR);
2222                 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2223                 wr_reg16(info, TCR, val); /* clear reset bit */
2224         }
2225
2226         if (info->tx_active) {
2227                 if (info->params.mode != MGSL_MODE_ASYNC) {
2228                         if (status & IRQ_TXUNDER)
2229                                 info->icount.txunder++;
2230                         else if (status & IRQ_TXIDLE)
2231                                 info->icount.txok++;
2232                 }
2233
2234                 info->tx_active = false;
2235                 info->tx_count = 0;
2236
2237                 del_timer(&info->tx_timer);
2238
2239                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2240                         info->signals &= ~SerialSignal_RTS;
2241                         info->drop_rts_on_tx_done = false;
2242                         set_signals(info);
2243                 }
2244
2245 #if SYNCLINK_GENERIC_HDLC
2246                 if (info->netcount)
2247                         hdlcdev_tx_done(info);
2248                 else
2249 #endif
2250                 {
2251                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2252                                 tx_stop(info);
2253                                 return;
2254                         }
2255                         info->pending_bh |= BH_TRANSMIT;
2256                 }
2257         }
2258 }
2259
2260 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2261 {
2262         struct cond_wait *w, *prev;
2263
2264         /* wake processes waiting for specific transitions */
2265         for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2266                 if (w->data & changed) {
2267                         w->data = state;
2268                         wake_up_interruptible(&w->q);
2269                         if (prev != NULL)
2270                                 prev->next = w->next;
2271                         else
2272                                 info->gpio_wait_q = w->next;
2273                 } else
2274                         prev = w;
2275         }
2276 }
2277
2278 /* interrupt service routine
2279  *
2280  *      irq     interrupt number
2281  *      dev_id  device ID supplied during interrupt registration
2282  */
2283 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2284 {
2285         struct slgt_info *info = dev_id;
2286         unsigned int gsr;
2287         unsigned int i;
2288
2289         DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2290
2291         spin_lock(&info->lock);
2292
2293         while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2294                 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2295                 info->irq_occurred = true;
2296                 for(i=0; i < info->port_count ; i++) {
2297                         if (info->port_array[i] == NULL)
2298                                 continue;
2299                         if (gsr & (BIT8 << i))
2300                                 isr_serial(info->port_array[i]);
2301                         if (gsr & (BIT16 << (i*2)))
2302                                 isr_rdma(info->port_array[i]);
2303                         if (gsr & (BIT17 << (i*2)))
2304                                 isr_tdma(info->port_array[i]);
2305                 }
2306         }
2307
2308         if (info->gpio_present) {
2309                 unsigned int state;
2310                 unsigned int changed;
2311                 while ((changed = rd_reg32(info, IOSR)) != 0) {
2312                         DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2313                         /* read latched state of GPIO signals */
2314                         state = rd_reg32(info, IOVR);
2315                         /* clear pending GPIO interrupt bits */
2316                         wr_reg32(info, IOSR, changed);
2317                         for (i=0 ; i < info->port_count ; i++) {
2318                                 if (info->port_array[i] != NULL)
2319                                         isr_gpio(info->port_array[i], changed, state);
2320                         }
2321                 }
2322         }
2323
2324         for(i=0; i < info->port_count ; i++) {
2325                 struct slgt_info *port = info->port_array[i];
2326
2327                 if (port && (port->port.count || port->netcount) &&
2328                     port->pending_bh && !port->bh_running &&
2329                     !port->bh_requested) {
2330                         DBGISR(("%s bh queued\n", port->device_name));
2331                         schedule_work(&port->task);
2332                         port->bh_requested = true;
2333                 }
2334         }
2335
2336         spin_unlock(&info->lock);
2337
2338         DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2339         return IRQ_HANDLED;
2340 }
2341
2342 static int startup(struct slgt_info *info)
2343 {
2344         DBGINFO(("%s startup\n", info->device_name));
2345
2346         if (info->port.flags & ASYNC_INITIALIZED)
2347                 return 0;
2348
2349         if (!info->tx_buf) {
2350                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2351                 if (!info->tx_buf) {
2352                         DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2353                         return -ENOMEM;
2354                 }
2355         }
2356
2357         info->pending_bh = 0;
2358
2359         memset(&info->icount, 0, sizeof(info->icount));
2360
2361         /* program hardware for current parameters */
2362         change_params(info);
2363
2364         if (info->port.tty)
2365                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2366
2367         info->port.flags |= ASYNC_INITIALIZED;
2368
2369         return 0;
2370 }
2371
2372 /*
2373  *  called by close() and hangup() to shutdown hardware
2374  */
2375 static void shutdown(struct slgt_info *info)
2376 {
2377         unsigned long flags;
2378
2379         if (!(info->port.flags & ASYNC_INITIALIZED))
2380                 return;
2381
2382         DBGINFO(("%s shutdown\n", info->device_name));
2383
2384         /* clear status wait queue because status changes */
2385         /* can't happen after shutting down the hardware */
2386         wake_up_interruptible(&info->status_event_wait_q);
2387         wake_up_interruptible(&info->event_wait_q);
2388
2389         del_timer_sync(&info->tx_timer);
2390         del_timer_sync(&info->rx_timer);
2391
2392         kfree(info->tx_buf);
2393         info->tx_buf = NULL;
2394
2395         spin_lock_irqsave(&info->lock,flags);
2396
2397         tx_stop(info);
2398         rx_stop(info);
2399
2400         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2401
2402         if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2403                 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2404                 set_signals(info);
2405         }
2406
2407         flush_cond_wait(&info->gpio_wait_q);
2408
2409         spin_unlock_irqrestore(&info->lock,flags);
2410
2411         if (info->port.tty)
2412                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2413
2414         info->port.flags &= ~ASYNC_INITIALIZED;
2415 }
2416
2417 static void program_hw(struct slgt_info *info)
2418 {
2419         unsigned long flags;
2420
2421         spin_lock_irqsave(&info->lock,flags);
2422
2423         rx_stop(info);
2424         tx_stop(info);
2425
2426         if (info->params.mode != MGSL_MODE_ASYNC ||
2427             info->netcount)
2428                 sync_mode(info);
2429         else
2430                 async_mode(info);
2431
2432         set_signals(info);
2433
2434         info->dcd_chkcount = 0;
2435         info->cts_chkcount = 0;
2436         info->ri_chkcount = 0;
2437         info->dsr_chkcount = 0;
2438
2439         slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2440         get_signals(info);
2441
2442         if (info->netcount ||
2443             (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2444                 rx_start(info);
2445
2446         spin_unlock_irqrestore(&info->lock,flags);
2447 }
2448
2449 /*
2450  * reconfigure adapter based on new parameters
2451  */
2452 static void change_params(struct slgt_info *info)
2453 {
2454         unsigned cflag;
2455         int bits_per_char;
2456
2457         if (!info->port.tty || !info->port.tty->termios)
2458                 return;
2459         DBGINFO(("%s change_params\n", info->device_name));
2460
2461         cflag = info->port.tty->termios->c_cflag;
2462
2463         /* if B0 rate (hangup) specified then negate DTR and RTS */
2464         /* otherwise assert DTR and RTS */
2465         if (cflag & CBAUD)
2466                 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2467         else
2468                 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2469
2470         /* byte size and parity */
2471
2472         switch (cflag & CSIZE) {
2473         case CS5: info->params.data_bits = 5; break;
2474         case CS6: info->params.data_bits = 6; break;
2475         case CS7: info->params.data_bits = 7; break;
2476         case CS8: info->params.data_bits = 8; break;
2477         default:  info->params.data_bits = 7; break;
2478         }
2479
2480         info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2481
2482         if (cflag & PARENB)
2483                 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2484         else
2485                 info->params.parity = ASYNC_PARITY_NONE;
2486
2487         /* calculate number of jiffies to transmit a full
2488          * FIFO (32 bytes) at specified data rate
2489          */
2490         bits_per_char = info->params.data_bits +
2491                         info->params.stop_bits + 1;
2492
2493         info->params.data_rate = tty_get_baud_rate(info->port.tty);
2494
2495         if (info->params.data_rate) {
2496                 info->timeout = (32*HZ*bits_per_char) /
2497                                 info->params.data_rate;
2498         }
2499         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2500
2501         if (cflag & CRTSCTS)
2502                 info->port.flags |= ASYNC_CTS_FLOW;
2503         else
2504                 info->port.flags &= ~ASYNC_CTS_FLOW;
2505
2506         if (cflag & CLOCAL)
2507                 info->port.flags &= ~ASYNC_CHECK_CD;
2508         else
2509                 info->port.flags |= ASYNC_CHECK_CD;
2510
2511         /* process tty input control flags */
2512
2513         info->read_status_mask = IRQ_RXOVER;
2514         if (I_INPCK(info->port.tty))
2515                 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2516         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2517                 info->read_status_mask |= MASK_BREAK;
2518         if (I_IGNPAR(info->port.tty))
2519                 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2520         if (I_IGNBRK(info->port.tty)) {
2521                 info->ignore_status_mask |= MASK_BREAK;
2522                 /* If ignoring parity and break indicators, ignore
2523                  * overruns too.  (For real raw support).
2524                  */
2525                 if (I_IGNPAR(info->port.tty))
2526                         info->ignore_status_mask |= MASK_OVERRUN;
2527         }
2528
2529         program_hw(info);
2530 }
2531
2532 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2533 {
2534         DBGINFO(("%s get_stats\n",  info->device_name));
2535         if (!user_icount) {
2536                 memset(&info->icount, 0, sizeof(info->icount));
2537         } else {
2538                 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2539                         return -EFAULT;
2540         }
2541         return 0;
2542 }
2543
2544 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2545 {
2546         DBGINFO(("%s get_params\n", info->device_name));
2547         if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2548                 return -EFAULT;
2549         return 0;
2550 }
2551
2552 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2553 {
2554         unsigned long flags;
2555         MGSL_PARAMS tmp_params;
2556
2557         DBGINFO(("%s set_params\n", info->device_name));
2558         if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2559                 return -EFAULT;
2560
2561         spin_lock_irqsave(&info->lock, flags);
2562         memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2563         spin_unlock_irqrestore(&info->lock, flags);
2564
2565         change_params(info);
2566
2567         return 0;
2568 }
2569
2570 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2571 {
2572         DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2573         if (put_user(info->idle_mode, idle_mode))
2574                 return -EFAULT;
2575         return 0;
2576 }
2577
2578 static int set_txidle(struct slgt_info *info, int idle_mode)
2579 {
2580         unsigned long flags;
2581         DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2582         spin_lock_irqsave(&info->lock,flags);
2583         info->idle_mode = idle_mode;
2584         if (info->params.mode != MGSL_MODE_ASYNC)
2585                 tx_set_idle(info);
2586         spin_unlock_irqrestore(&info->lock,flags);
2587         return 0;
2588 }
2589
2590 static int tx_enable(struct slgt_info *info, int enable)
2591 {
2592         unsigned long flags;
2593         DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2594         spin_lock_irqsave(&info->lock,flags);
2595         if (enable) {
2596                 if (!info->tx_enabled)
2597                         tx_start(info);
2598         } else {
2599                 if (info->tx_enabled)
2600                         tx_stop(info);
2601         }
2602         spin_unlock_irqrestore(&info->lock,flags);
2603         return 0;
2604 }
2605
2606 /*
2607  * abort transmit HDLC frame
2608  */
2609 static int tx_abort(struct slgt_info *info)
2610 {
2611         unsigned long flags;
2612         DBGINFO(("%s tx_abort\n", info->device_name));
2613         spin_lock_irqsave(&info->lock,flags);
2614         tdma_reset(info);
2615         spin_unlock_irqrestore(&info->lock,flags);
2616         return 0;
2617 }
2618
2619 static int rx_enable(struct slgt_info *info, int enable)
2620 {
2621         unsigned long flags;
2622         unsigned int rbuf_fill_level;
2623         DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2624         spin_lock_irqsave(&info->lock,flags);
2625         /*
2626          * enable[31..16] = receive DMA buffer fill level
2627          * 0 = noop (leave fill level unchanged)
2628          * fill level must be multiple of 4 and <= buffer size
2629          */
2630         rbuf_fill_level = ((unsigned int)enable) >> 16;
2631         if (rbuf_fill_level) {
2632                 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2633                         spin_unlock_irqrestore(&info->lock, flags);
2634                         return -EINVAL;
2635                 }
2636                 info->rbuf_fill_level = rbuf_fill_level;
2637                 rx_stop(info); /* restart receiver to use new fill level */
2638         }
2639
2640         /*
2641          * enable[1..0] = receiver enable command
2642          * 0 = disable
2643          * 1 = enable
2644          * 2 = enable or force hunt mode if already enabled
2645          */
2646         enable &= 3;
2647         if (enable) {
2648                 if (!info->rx_enabled)
2649                         rx_start(info);
2650                 else if (enable == 2) {
2651                         /* force hunt mode (write 1 to RCR[3]) */
2652                         wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2653                 }
2654         } else {
2655                 if (info->rx_enabled)
2656                         rx_stop(info);
2657         }
2658         spin_unlock_irqrestore(&info->lock,flags);
2659         return 0;
2660 }
2661
2662 /*
2663  *  wait for specified event to occur
2664  */
2665 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2666 {
2667         unsigned long flags;
2668         int s;
2669         int rc=0;
2670         struct mgsl_icount cprev, cnow;
2671         int events;
2672         int mask;
2673         struct  _input_signal_events oldsigs, newsigs;
2674         DECLARE_WAITQUEUE(wait, current);
2675
2676         if (get_user(mask, mask_ptr))
2677                 return -EFAULT;
2678
2679         DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2680
2681         spin_lock_irqsave(&info->lock,flags);
2682
2683         /* return immediately if state matches requested events */
2684         get_signals(info);
2685         s = info->signals;
2686
2687         events = mask &
2688                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2689                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2690                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2691                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2692         if (events) {
2693                 spin_unlock_irqrestore(&info->lock,flags);
2694                 goto exit;
2695         }
2696
2697         /* save current irq counts */
2698         cprev = info->icount;
2699         oldsigs = info->input_signal_events;
2700
2701         /* enable hunt and idle irqs if needed */
2702         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2703                 unsigned short val = rd_reg16(info, SCR);
2704                 if (!(val & IRQ_RXIDLE))
2705                         wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2706         }
2707
2708         set_current_state(TASK_INTERRUPTIBLE);
2709         add_wait_queue(&info->event_wait_q, &wait);
2710
2711         spin_unlock_irqrestore(&info->lock,flags);
2712
2713         for(;;) {
2714                 schedule();
2715                 if (signal_pending(current)) {
2716                         rc = -ERESTARTSYS;
2717                         break;
2718                 }
2719
2720                 /* get current irq counts */
2721                 spin_lock_irqsave(&info->lock,flags);
2722                 cnow = info->icount;
2723                 newsigs = info->input_signal_events;
2724                 set_current_state(TASK_INTERRUPTIBLE);
2725                 spin_unlock_irqrestore(&info->lock,flags);
2726
2727                 /* if no change, wait aborted for some reason */
2728                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
2729                     newsigs.dsr_down == oldsigs.dsr_down &&
2730                     newsigs.dcd_up   == oldsigs.dcd_up   &&
2731                     newsigs.dcd_down == oldsigs.dcd_down &&
2732                     newsigs.cts_up   == oldsigs.cts_up   &&
2733                     newsigs.cts_down == oldsigs.cts_down &&
2734                     newsigs.ri_up    == oldsigs.ri_up    &&
2735                     newsigs.ri_down  == oldsigs.ri_down  &&
2736                     cnow.exithunt    == cprev.exithunt   &&
2737                     cnow.rxidle      == cprev.rxidle) {
2738                         rc = -EIO;
2739                         break;
2740                 }
2741
2742                 events = mask &
2743                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
2744                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2745                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
2746                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2747                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
2748                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2749                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
2750                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
2751                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
2752                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
2753                 if (events)
2754                         break;
2755
2756                 cprev = cnow;
2757                 oldsigs = newsigs;
2758         }
2759
2760         remove_wait_queue(&info->event_wait_q, &wait);
2761         set_current_state(TASK_RUNNING);
2762
2763
2764         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2765                 spin_lock_irqsave(&info->lock,flags);
2766                 if (!waitqueue_active(&info->event_wait_q)) {
2767                         /* disable enable exit hunt mode/idle rcvd IRQs */
2768                         wr_reg16(info, SCR,
2769                                 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2770                 }
2771                 spin_unlock_irqrestore(&info->lock,flags);
2772         }
2773 exit:
2774         if (rc == 0)
2775                 rc = put_user(events, mask_ptr);
2776         return rc;
2777 }
2778
2779 static int get_interface(struct slgt_info *info, int __user *if_mode)
2780 {
2781         DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2782         if (put_user(info->if_mode, if_mode))
2783                 return -EFAULT;
2784         return 0;
2785 }
2786
2787 static int set_interface(struct slgt_info *info, int if_mode)
2788 {
2789         unsigned long flags;
2790         unsigned short val;
2791
2792         DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2793         spin_lock_irqsave(&info->lock,flags);
2794         info->if_mode = if_mode;
2795
2796         msc_set_vcr(info);
2797
2798         /* TCR (tx control) 07  1=RTS driver control */
2799         val = rd_reg16(info, TCR);
2800         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2801                 val |= BIT7;
2802         else
2803                 val &= ~BIT7;
2804         wr_reg16(info, TCR, val);
2805
2806         spin_unlock_irqrestore(&info->lock,flags);
2807         return 0;
2808 }
2809
2810 /*
2811  * set general purpose IO pin state and direction
2812  *
2813  * user_gpio fields:
2814  * state   each bit indicates a pin state
2815  * smask   set bit indicates pin state to set
2816  * dir     each bit indicates a pin direction (0=input, 1=output)
2817  * dmask   set bit indicates pin direction to set
2818  */
2819 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2820 {
2821         unsigned long flags;
2822         struct gpio_desc gpio;
2823         __u32 data;
2824
2825         if (!info->gpio_present)
2826                 return -EINVAL;
2827         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2828                 return -EFAULT;
2829         DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2830                  info->device_name, gpio.state, gpio.smask,
2831                  gpio.dir, gpio.dmask));
2832
2833         spin_lock_irqsave(&info->lock,flags);
2834         if (gpio.dmask) {
2835                 data = rd_reg32(info, IODR);
2836                 data |= gpio.dmask & gpio.dir;
2837                 data &= ~(gpio.dmask & ~gpio.dir);
2838                 wr_reg32(info, IODR, data);
2839         }
2840         if (gpio.smask) {
2841                 data = rd_reg32(info, IOVR);
2842                 data |= gpio.smask & gpio.state;
2843                 data &= ~(gpio.smask & ~gpio.state);
2844                 wr_reg32(info, IOVR, data);
2845         }
2846         spin_unlock_irqrestore(&info->lock,flags);
2847
2848         return 0;
2849 }
2850
2851 /*
2852  * get general purpose IO pin state and direction
2853  */
2854 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2855 {
2856         struct gpio_desc gpio;
2857         if (!info->gpio_present)
2858                 return -EINVAL;
2859         gpio.state = rd_reg32(info, IOVR);
2860         gpio.smask = 0xffffffff;
2861         gpio.dir   = rd_reg32(info, IODR);
2862         gpio.dmask = 0xffffffff;
2863         if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2864                 return -EFAULT;
2865         DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2866                  info->device_name, gpio.state, gpio.dir));
2867         return 0;
2868 }
2869
2870 /*
2871  * conditional wait facility
2872  */
2873 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2874 {
2875         init_waitqueue_head(&w->q);
2876         init_waitqueue_entry(&w->wait, current);
2877         w->data = data;
2878 }
2879
2880 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2881 {
2882         set_current_state(TASK_INTERRUPTIBLE);
2883         add_wait_queue(&w->q, &w->wait);
2884         w->next = *head;
2885         *head = w;
2886 }
2887
2888 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2889 {
2890         struct cond_wait *w, *prev;
2891         remove_wait_queue(&cw->q, &cw->wait);
2892         set_current_state(TASK_RUNNING);
2893         for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2894                 if (w == cw) {
2895                         if (prev != NULL)
2896                                 prev->next = w->next;
2897                         else
2898                                 *head = w->next;
2899                         break;
2900                 }
2901         }
2902 }
2903
2904 static void flush_cond_wait(struct cond_wait **head)
2905 {
2906         while (*head != NULL) {
2907                 wake_up_interruptible(&(*head)->q);
2908                 *head = (*head)->next;
2909         }
2910 }
2911
2912 /*
2913  * wait for general purpose I/O pin(s) to enter specified state
2914  *
2915  * user_gpio fields:
2916  * state - bit indicates target pin state
2917  * smask - set bit indicates watched pin
2918  *
2919  * The wait ends when at least one watched pin enters the specified
2920  * state. When 0 (no error) is returned, user_gpio->state is set to the
2921  * state of all GPIO pins when the wait ends.
2922  *
2923  * Note: Each pin may be a dedicated input, dedicated output, or
2924  * configurable input/output. The number and configuration of pins
2925  * varies with the specific adapter model. Only input pins (dedicated
2926  * or configured) can be monitored with this function.
2927  */
2928 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2929 {
2930         unsigned long flags;
2931         int rc = 0;
2932         struct gpio_desc gpio;
2933         struct cond_wait wait;
2934         u32 state;
2935
2936         if (!info->gpio_present)
2937                 return -EINVAL;
2938         if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2939                 return -EFAULT;
2940         DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2941                  info->device_name, gpio.state, gpio.smask));
2942         /* ignore output pins identified by set IODR bit */
2943         if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2944                 return -EINVAL;
2945         init_cond_wait(&wait, gpio.smask);
2946
2947         spin_lock_irqsave(&info->lock, flags);
2948         /* enable interrupts for watched pins */
2949         wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2950         /* get current pin states */
2951         state = rd_reg32(info, IOVR);
2952
2953         if (gpio.smask & ~(state ^ gpio.state)) {
2954                 /* already in target state */
2955                 gpio.state = state;
2956         } else {
2957                 /* wait for target state */
2958                 add_cond_wait(&info->gpio_wait_q, &wait);
2959                 spin_unlock_irqrestore(&info->lock, flags);
2960                 schedule();
2961                 if (signal_pending(current))
2962                         rc = -ERESTARTSYS;
2963                 else
2964                         gpio.state = wait.data;
2965                 spin_lock_irqsave(&info->lock, flags);
2966                 remove_cond_wait(&info->gpio_wait_q, &wait);
2967         }
2968
2969         /* disable all GPIO interrupts if no waiting processes */
2970         if (info->gpio_wait_q == NULL)
2971                 wr_reg32(info, IOER, 0);
2972         spin_unlock_irqrestore(&info->lock,flags);
2973
2974         if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2975                 rc = -EFAULT;
2976         return rc;
2977 }
2978
2979 static int modem_input_wait(struct slgt_info *info,int arg)
2980 {
2981         unsigned long flags;
2982         int rc;
2983         struct mgsl_icount cprev, cnow;
2984         DECLARE_WAITQUEUE(wait, current);
2985
2986         /* save current irq counts */
2987         spin_lock_irqsave(&info->lock,flags);
2988         cprev = info->icount;
2989         add_wait_queue(&info->status_event_wait_q, &wait);
2990         set_current_state(TASK_INTERRUPTIBLE);
2991         spin_unlock_irqrestore(&info->lock,flags);
2992
2993         for(;;) {
2994                 schedule();
2995                 if (signal_pending(current)) {
2996                         rc = -ERESTARTSYS;
2997                         break;
2998                 }
2999
3000                 /* get new irq counts */
3001                 spin_lock_irqsave(&info->lock,flags);
3002                 cnow = info->icount;
3003                 set_current_state(TASK_INTERRUPTIBLE);
3004                 spin_unlock_irqrestore(&info->lock,flags);
3005
3006                 /* if no change, wait aborted for some reason */
3007                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3008                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3009                         rc = -EIO;
3010                         break;
3011                 }
3012
3013                 /* check for change in caller specified modem input */
3014                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3015                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3016                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3017                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3018                         rc = 0;
3019                         break;
3020                 }
3021
3022                 cprev = cnow;
3023         }
3024         remove_wait_queue(&info->status_event_wait_q, &wait);
3025         set_current_state(TASK_RUNNING);
3026         return rc;
3027 }
3028
3029 /*
3030  *  return state of serial control and status signals
3031  */
3032 static int tiocmget(struct tty_struct *tty, struct file *file)
3033 {
3034         struct slgt_info *info = tty->driver_data;
3035         unsigned int result;
3036         unsigned long flags;
3037
3038         spin_lock_irqsave(&info->lock,flags);
3039         get_signals(info);
3040         spin_unlock_irqrestore(&info->lock,flags);
3041
3042         result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3043                 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3044                 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3045                 ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3046                 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3047                 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3048
3049         DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3050         return result;
3051 }
3052
3053 /*
3054  * set modem control signals (DTR/RTS)
3055  *
3056  *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3057  *              TIOCMSET = set/clear signal values
3058  *      value   bit mask for command
3059  */
3060 static int tiocmset(struct tty_struct *tty, struct file *file,
3061                     unsigned int set, unsigned int clear)
3062 {
3063         struct slgt_info *info = tty->driver_data;
3064         unsigned long flags;
3065
3066         DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3067
3068         if (set & TIOCM_RTS)
3069                 info->signals |= SerialSignal_RTS;
3070         if (set & TIOCM_DTR)
3071                 info->signals |= SerialSignal_DTR;
3072         if (clear & TIOCM_RTS)
3073                 info->signals &= ~SerialSignal_RTS;
3074         if (clear & TIOCM_DTR)
3075                 info->signals &= ~SerialSignal_DTR;
3076
3077         spin_lock_irqsave(&info->lock,flags);
3078         set_signals(info);
3079         spin_unlock_irqrestore(&info->lock,flags);
3080         return 0;
3081 }
3082
3083 static int carrier_raised(struct tty_port *port)
3084 {
3085         unsigned long flags;
3086         struct slgt_info *info = container_of(port, struct slgt_info, port);
3087
3088         spin_lock_irqsave(&info->lock,flags);
3089         get_signals(info);
3090         spin_unlock_irqrestore(&info->lock,flags);
3091         return (info->signals & SerialSignal_DCD) ? 1 : 0;
3092 }
3093
3094 static void raise_dtr_rts(struct tty_port *port)
3095 {
3096         unsigned long flags;
3097         struct slgt_info *info = container_of(port, struct slgt_info, port);
3098
3099         spin_lock_irqsave(&info->lock,flags);
3100         info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3101         set_signals(info);
3102         spin_unlock_irqrestore(&info->lock,flags);
3103 }
3104
3105
3106 /*
3107  *  block current process until the device is ready to open
3108  */
3109 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3110                            struct slgt_info *info)
3111 {
3112         DECLARE_WAITQUEUE(wait, current);
3113         int             retval;
3114         bool            do_clocal = false;
3115         bool            extra_count = false;
3116         unsigned long   flags;
3117         int             cd;
3118         struct tty_port *port = &info->port;
3119
3120         DBGINFO(("%s block_til_ready\n", tty->driver->name));
3121
3122         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3123                 /* nonblock mode is set or port is not enabled */
3124                 port->flags |= ASYNC_NORMAL_ACTIVE;
3125                 return 0;
3126         }
3127
3128         if (tty->termios->c_cflag & CLOCAL)
3129                 do_clocal = true;
3130
3131         /* Wait for carrier detect and the line to become
3132          * free (i.e., not in use by the callout).  While we are in
3133          * this loop, port->count is dropped by one, so that
3134          * close() knows when to free things.  We restore it upon
3135          * exit, either normal or abnormal.
3136          */
3137
3138         retval = 0;
3139         add_wait_queue(&port->open_wait, &wait);
3140
3141         spin_lock_irqsave(&info->lock, flags);
3142         if (!tty_hung_up_p(filp)) {
3143                 extra_count = true;
3144                 port->count--;
3145         }
3146         spin_unlock_irqrestore(&info->lock, flags);
3147         port->blocked_open++;
3148
3149         while (1) {
3150                 if ((tty->termios->c_cflag & CBAUD))
3151                         tty_port_raise_dtr_rts(port);
3152
3153                 set_current_state(TASK_INTERRUPTIBLE);
3154
3155                 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3156                         retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3157                                         -EAGAIN : -ERESTARTSYS;
3158                         break;
3159                 }
3160
3161                 cd = tty_port_carrier_raised(port);
3162
3163                 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3164                         break;
3165
3166                 if (signal_pending(current)) {
3167                         retval = -ERESTARTSYS;
3168                         break;
3169                 }
3170
3171                 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3172                 schedule();
3173         }
3174
3175         set_current_state(TASK_RUNNING);
3176         remove_wait_queue(&port->open_wait, &wait);
3177
3178         if (extra_count)
3179                 port->count++;
3180         port->blocked_open--;
3181
3182         if (!retval)
3183                 port->flags |= ASYNC_NORMAL_ACTIVE;
3184
3185         DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3186         return retval;
3187 }
3188
3189 static int alloc_tmp_rbuf(struct slgt_info *info)
3190 {
3191         info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3192         if (info->tmp_rbuf == NULL)
3193                 return -ENOMEM;
3194         return 0;
3195 }
3196
3197 static void free_tmp_rbuf(struct slgt_info *info)
3198 {
3199         kfree(info->tmp_rbuf);
3200         info->tmp_rbuf = NULL;
3201 }
3202
3203 /*
3204  * allocate DMA descriptor lists.
3205  */
3206 static int alloc_desc(struct slgt_info *info)
3207 {
3208         unsigned int i;
3209         unsigned int pbufs;
3210
3211         /* allocate memory to hold descriptor lists */
3212         info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3213         if (info->bufs == NULL)
3214                 return -ENOMEM;
3215
3216         memset(info->bufs, 0, DESC_LIST_SIZE);
3217
3218         info->rbufs = (struct slgt_desc*)info->bufs;
3219         info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3220
3221         pbufs = (unsigned int)info->bufs_dma_addr;
3222
3223         /*
3224          * Build circular lists of descriptors
3225          */
3226
3227         for (i=0; i < info->rbuf_count; i++) {
3228                 /* physical address of this descriptor */
3229                 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3230
3231                 /* physical address of next descriptor */
3232                 if (i == info->rbuf_count - 1)
3233                         info->rbufs[i].next = cpu_to_le32(pbufs);
3234                 else
3235                         info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3236                 set_desc_count(info->rbufs[i], DMABUFSIZE);
3237         }
3238
3239         for (i=0; i < info->tbuf_count; i++) {
3240                 /* physical address of this descriptor */
3241                 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3242
3243                 /* physical address of next descriptor */
3244                 if (i == info->tbuf_count - 1)
3245                         info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3246                 else
3247                         info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3248         }
3249
3250         return 0;
3251 }
3252
3253 static void free_desc(struct slgt_info *info)
3254 {
3255         if (info->bufs != NULL) {
3256                 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3257                 info->bufs  = NULL;
3258                 info->rbufs = NULL;
3259                 info->tbufs = NULL;
3260         }
3261 }
3262
3263 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3264 {
3265         int i;
3266         for (i=0; i < count; i++) {
3267                 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3268                         return -ENOMEM;
3269                 bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3270         }
3271         return 0;
3272 }
3273
3274 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3275 {
3276         int i;
3277         for (i=0; i < count; i++) {
3278                 if (bufs[i].buf == NULL)
3279                         continue;
3280                 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3281                 bufs[i].buf = NULL;
3282         }
3283 }
3284
3285 static int alloc_dma_bufs(struct slgt_info *info)
3286 {
3287         info->rbuf_count = 32;
3288         info->tbuf_count = 32;
3289
3290         if (alloc_desc(info) < 0 ||
3291             alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3292             alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3293             alloc_tmp_rbuf(info) < 0) {
3294                 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3295                 return -ENOMEM;
3296         }
3297         reset_rbufs(info);
3298         return 0;
3299 }
3300
3301 static void free_dma_bufs(struct slgt_info *info)
3302 {
3303         if (info->bufs) {
3304                 free_bufs(info, info->rbufs, info->rbuf_count);
3305                 free_bufs(info, info->tbufs, info->tbuf_count);
3306                 free_desc(info);
3307         }
3308         free_tmp_rbuf(info);
3309 }
3310
3311 static int claim_resources(struct slgt_info *info)
3312 {
3313         if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3314                 DBGERR(("%s reg addr conflict, addr=%08X\n",
3315                         info->device_name, info->phys_reg_addr));
3316                 info->init_error = DiagStatus_AddressConflict;
3317                 goto errout;
3318         }
3319         else
3320                 info->reg_addr_requested = true;
3321
3322         info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3323         if (!info->reg_addr) {
3324                 DBGERR(("%s cant map device registers, addr=%08X\n",
3325                         info->device_name, info->phys_reg_addr));
3326                 info->init_error = DiagStatus_CantAssignPciResources;
3327                 goto errout;
3328         }
3329         return 0;
3330
3331 errout:
3332         release_resources(info);
3333         return -ENODEV;
3334 }
3335
3336 static void release_resources(struct slgt_info *info)
3337 {
3338         if (info->irq_requested) {
3339                 free_irq(info->irq_level, info);
3340                 info->irq_requested = false;
3341         }
3342
3343         if (info->reg_addr_requested) {
3344                 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3345                 info->reg_addr_requested = false;
3346         }
3347
3348         if (info->reg_addr) {
3349                 iounmap(info->reg_addr);
3350                 info->reg_addr = NULL;
3351         }
3352 }
3353
3354 /* Add the specified device instance data structure to the
3355  * global linked list of devices and increment the device count.
3356  */
3357 static void add_device(struct slgt_info *info)
3358 {
3359         char *devstr;
3360
3361         info->next_device = NULL;
3362         info->line = slgt_device_count;
3363         sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3364
3365         if (info->line < MAX_DEVICES) {
3366                 if (maxframe[info->line])
3367                         info->max_frame_size = maxframe[info->line];
3368         }
3369
3370         slgt_device_count++;
3371
3372         if (!slgt_device_list)
3373                 slgt_device_list = info;
3374         else {
3375                 struct slgt_info *current_dev = slgt_device_list;
3376                 while(current_dev->next_device)
3377                         current_dev = current_dev->next_device;
3378                 current_dev->next_device = info;
3379         }
3380
3381         if (info->max_frame_size < 4096)
3382                 info->max_frame_size = 4096;
3383         else if (info->max_frame_size > 65535)
3384                 info->max_frame_size = 65535;
3385
3386         switch(info->pdev->device) {
3387         case SYNCLINK_GT_DEVICE_ID:
3388                 devstr = "GT";
3389                 break;
3390         case SYNCLINK_GT2_DEVICE_ID:
3391                 devstr = "GT2";
3392                 break;
3393         case SYNCLINK_GT4_DEVICE_ID:
3394                 devstr = "GT4";
3395                 break;
3396         case SYNCLINK_AC_DEVICE_ID:
3397                 devstr = "AC";
3398                 info->params.mode = MGSL_MODE_ASYNC;
3399                 break;
3400         default:
3401                 devstr = "(unknown model)";
3402         }
3403         printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3404                 devstr, info->device_name, info->phys_reg_addr,
3405                 info->irq_level, info->max_frame_size);
3406
3407 #if SYNCLINK_GENERIC_HDLC
3408         hdlcdev_init(info);
3409 #endif
3410 }
3411
3412 static const struct tty_port_operations slgt_port_ops = {
3413         .carrier_raised = carrier_raised,
3414         .raise_dtr_rts = raise_dtr_rts,
3415 };
3416
3417 /*
3418  *  allocate device instance structure, return NULL on failure
3419  */
3420 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3421 {
3422         struct slgt_info *info;
3423
3424         info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3425
3426         if (!info) {
3427                 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3428                         driver_name, adapter_num, port_num));
3429         } else {
3430                 tty_port_init(&info->port);
3431                 info->port.ops = &slgt_port_ops;
3432                 info->magic = MGSL_MAGIC;
3433                 INIT_WORK(&info->task, bh_handler);
3434                 info->max_frame_size = 4096;
3435                 info->rbuf_fill_level = DMABUFSIZE;
3436                 info->port.close_delay = 5*HZ/10;
3437                 info->port.closing_wait = 30*HZ;
3438                 init_waitqueue_head(&info->status_event_wait_q);
3439                 init_waitqueue_head(&info->event_wait_q);
3440                 spin_lock_init(&info->netlock);
3441                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3442                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3443                 info->adapter_num = adapter_num;
3444                 info->port_num = port_num;
3445
3446                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3447                 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3448
3449                 /* Copy configuration info to device instance data */
3450                 info->pdev = pdev;
3451                 info->irq_level = pdev->irq;
3452                 info->phys_reg_addr = pci_resource_start(pdev,0);
3453
3454                 info->bus_type = MGSL_BUS_TYPE_PCI;
3455                 info->irq_flags = IRQF_SHARED;
3456
3457                 info->init_error = -1; /* assume error, set to 0 on successful init */
3458         }
3459
3460         return info;
3461 }
3462
3463 static void device_init(int adapter_num, struct pci_dev *pdev)
3464 {
3465         struct slgt_info *port_array[SLGT_MAX_PORTS];
3466         int i;
3467         int port_count = 1;
3468
3469         if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3470                 port_count = 2;
3471         else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3472                 port_count = 4;
3473
3474         /* allocate device instances for all ports */
3475         for (i=0; i < port_count; ++i) {
3476                 port_array[i] = alloc_dev(adapter_num, i, pdev);
3477                 if (port_array[i] == NULL) {
3478                         for (--i; i >= 0; --i)
3479                                 kfree(port_array[i]);
3480                         return;
3481                 }
3482         }
3483
3484         /* give copy of port_array to all ports and add to device list  */
3485         for (i=0; i < port_count; ++i) {
3486                 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3487                 add_device(port_array[i]);
3488                 port_array[i]->port_count = port_count;
3489                 spin_lock_init(&port_array[i]->lock);
3490         }
3491
3492         /* Allocate and claim adapter resources */
3493         if (!claim_resources(port_array[0])) {
3494
3495                 alloc_dma_bufs(port_array[0]);
3496
3497                 /* copy resource information from first port to others */
3498                 for (i = 1; i < port_count; ++i) {
3499                         port_array[i]->lock      = port_array[0]->lock;
3500                         port_array[i]->irq_level = port_array[0]->irq_level;
3501                         port_array[i]->reg_addr  = port_array[0]->reg_addr;
3502                         alloc_dma_bufs(port_array[i]);
3503                 }
3504
3505                 if (request_irq(port_array[0]->irq_level,
3506                                         slgt_interrupt,
3507                                         port_array[0]->irq_flags,
3508                                         port_array[0]->device_name,
3509                                         port_array[0]) < 0) {
3510                         DBGERR(("%s request_irq failed IRQ=%d\n",
3511                                 port_array[0]->device_name,
3512                                 port_array[0]->irq_level));
3513                 } else {
3514                         port_array[0]->irq_requested = true;
3515                         adapter_test(port_array[0]);
3516                         for (i=1 ; i < port_count ; i++) {
3517                                 port_array[i]->init_error = port_array[0]->init_error;
3518                                 port_array[i]->gpio_present = port_array[0]->gpio_present;
3519                         }
3520                 }
3521         }
3522
3523         for (i=0; i < port_count; ++i)
3524                 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3525 }
3526
3527 static int __devinit init_one(struct pci_dev *dev,
3528                               const struct pci_device_id *ent)
3529 {
3530         if (pci_enable_device(dev)) {
3531                 printk("error enabling pci device %p\n", dev);
3532                 return -EIO;
3533         }
3534         pci_set_master(dev);
3535         device_init(slgt_device_count, dev);
3536         return 0;
3537 }
3538
3539 static void __devexit remove_one(struct pci_dev *dev)
3540 {
3541 }
3542
3543 static const struct tty_operations ops = {
3544         .open = open,
3545         .close = close,
3546         .write = write,
3547         .put_char = put_char,
3548         .flush_chars = flush_chars,
3549         .write_room = write_room,
3550         .chars_in_buffer = chars_in_buffer,
3551         .flush_buffer = flush_buffer,
3552         .ioctl = ioctl,
3553         .compat_ioctl = slgt_compat_ioctl,
3554         .throttle = throttle,
3555         .unthrottle = unthrottle,
3556         .send_xchar = send_xchar,
3557         .break_ctl = set_break,
3558         .wait_until_sent = wait_until_sent,
3559         .set_termios = set_termios,
3560         .stop = tx_hold,
3561         .start = tx_release,
3562         .hangup = hangup,
3563         .tiocmget = tiocmget,
3564         .tiocmset = tiocmset,
3565         .proc_fops = &synclink_gt_proc_fops,
3566 };
3567
3568 static void slgt_cleanup(void)
3569 {
3570         int rc;
3571         struct slgt_info *info;
3572         struct slgt_info *tmp;
3573
3574         printk(KERN_INFO "unload %s\n", driver_name);
3575
3576         if (serial_driver) {
3577                 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3578                         tty_unregister_device(serial_driver, info->line);
3579                 if ((rc = tty_unregister_driver(serial_driver)))
3580                         DBGERR(("tty_unregister_driver error=%d\n", rc));
3581                 put_tty_driver(serial_driver);
3582         }
3583
3584         /* reset devices */
3585         info = slgt_device_list;
3586         while(info) {
3587                 reset_port(info);
3588                 info = info->next_device;
3589         }
3590
3591         /* release devices */
3592         info = slgt_device_list;
3593         while(info) {
3594 #if SYNCLINK_GENERIC_HDLC
3595                 hdlcdev_exit(info);
3596 #endif
3597                 free_dma_bufs(info);
3598                 free_tmp_rbuf(info);
3599                 if (info->port_num == 0)
3600                         release_resources(info);
3601                 tmp = info;
3602                 info = info->next_device;
3603                 kfree(tmp);
3604         }
3605
3606         if (pci_registered)
3607                 pci_unregister_driver(&pci_driver);
3608 }
3609
3610 /*
3611  *  Driver initialization entry point.
3612  */
3613 static int __init slgt_init(void)
3614 {
3615         int rc;
3616
3617         printk(KERN_INFO "%s\n", driver_name);
3618
3619         serial_driver = alloc_tty_driver(MAX_DEVICES);
3620         if (!serial_driver) {
3621                 printk("%s can't allocate tty driver\n", driver_name);
3622                 return -ENOMEM;
3623         }
3624
3625         /* Initialize the tty_driver structure */
3626
3627         serial_driver->owner = THIS_MODULE;
3628         serial_driver->driver_name = tty_driver_name;
3629         serial_driver->name = tty_dev_prefix;
3630         serial_driver->major = ttymajor;
3631         serial_driver->minor_start = 64;
3632         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3633         serial_driver->subtype = SERIAL_TYPE_NORMAL;
3634         serial_driver->init_termios = tty_std_termios;
3635         serial_driver->init_termios.c_cflag =
3636                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3637         serial_driver->init_termios.c_ispeed = 9600;
3638         serial_driver->init_termios.c_ospeed = 9600;
3639         serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3640         tty_set_operations(serial_driver, &ops);
3641         if ((rc = tty_register_driver(serial_driver)) < 0) {
3642                 DBGERR(("%s can't register serial driver\n", driver_name));
3643                 put_tty_driver(serial_driver);
3644                 serial_driver = NULL;
3645                 goto error;
3646         }
3647
3648         printk(KERN_INFO "%s, tty major#%d\n",
3649                driver_name, serial_driver->major);
3650
3651         slgt_device_count = 0;
3652         if ((rc = pci_register_driver(&pci_driver)) < 0) {
3653                 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3654                 goto error;
3655         }
3656         pci_registered = true;
3657
3658         if (!slgt_device_list)
3659                 printk("%s no devices found\n",driver_name);
3660
3661         return 0;
3662
3663 error:
3664         slgt_cleanup();
3665         return rc;
3666 }
3667
3668 static void __exit slgt_exit(void)
3669 {
3670         slgt_cleanup();
3671 }
3672
3673 module_init(slgt_init);
3674 module_exit(slgt_exit);
3675
3676 /*
3677  * register access routines
3678  */
3679
3680 #define CALC_REGADDR() \
3681         unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3682         if (addr >= 0x80) \
3683                 reg_addr += (info->port_num) * 32;
3684
3685 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3686 {
3687         CALC_REGADDR();
3688         return readb((void __iomem *)reg_addr);
3689 }
3690
3691 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3692 {
3693         CALC_REGADDR();
3694         writeb(value, (void __iomem *)reg_addr);
3695 }
3696
3697 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3698 {
3699         CALC_REGADDR();
3700         return readw((void __iomem *)reg_addr);
3701 }
3702
3703 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3704 {
3705         CALC_REGADDR();
3706         writew(value, (void __iomem *)reg_addr);
3707 }
3708
3709 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3710 {
3711         CALC_REGADDR();
3712         return readl((void __iomem *)reg_addr);
3713 }
3714
3715 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3716 {
3717         CALC_REGADDR();
3718         writel(value, (void __iomem *)reg_addr);
3719 }
3720
3721 static void rdma_reset(struct slgt_info *info)
3722 {
3723         unsigned int i;
3724
3725         /* set reset bit */
3726         wr_reg32(info, RDCSR, BIT1);
3727
3728         /* wait for enable bit cleared */
3729         for(i=0 ; i < 1000 ; i++)
3730                 if (!(rd_reg32(info, RDCSR) & BIT0))
3731                         break;
3732 }
3733
3734 static void tdma_reset(struct slgt_info *info)
3735 {
3736         unsigned int i;
3737
3738         /* set reset bit */
3739         wr_reg32(info, TDCSR, BIT1);
3740
3741         /* wait for enable bit cleared */
3742         for(i=0 ; i < 1000 ; i++)
3743                 if (!(rd_reg32(info, TDCSR) & BIT0))
3744                         break;
3745 }
3746
3747 /*
3748  * enable internal loopback
3749  * TxCLK and RxCLK are generated from BRG
3750  * and TxD is looped back to RxD internally.
3751  */
3752 static void enable_loopback(struct slgt_info *info)
3753 {
3754         /* SCR (serial control) BIT2=looopback enable */
3755         wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3756
3757         if (info->params.mode != MGSL_MODE_ASYNC) {
3758                 /* CCR (clock control)
3759                  * 07..05  tx clock source (010 = BRG)
3760                  * 04..02  rx clock source (010 = BRG)
3761                  * 01      auxclk enable   (0 = disable)
3762                  * 00      BRG enable      (1 = enable)
3763                  *
3764                  * 0100 1001
3765                  */
3766                 wr_reg8(info, CCR, 0x49);
3767
3768                 /* set speed if available, otherwise use default */
3769                 if (info->params.clock_speed)
3770                         set_rate(info, info->params.clock_speed);
3771                 else
3772                         set_rate(info, 3686400);
3773         }
3774 }
3775
3776 /*
3777  *  set baud rate generator to specified rate
3778  */
3779 static void set_rate(struct slgt_info *info, u32 rate)
3780 {
3781         unsigned int div;
3782         static unsigned int osc = 14745600;
3783
3784         /* div = osc/rate - 1
3785          *
3786          * Round div up if osc/rate is not integer to
3787          * force to next slowest rate.
3788          */
3789
3790         if (rate) {
3791                 div = osc/rate;
3792                 if (!(osc % rate) && div)
3793                         div--;
3794                 wr_reg16(info, BDR, (unsigned short)div);
3795         }
3796 }
3797
3798 static void rx_stop(struct slgt_info *info)
3799 {
3800         unsigned short val;
3801
3802         /* disable and reset receiver */
3803         val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
3804         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3805         wr_reg16(info, RCR, val);                  /* clear reset bit */
3806
3807         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3808
3809         /* clear pending rx interrupts */
3810         wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3811
3812         rdma_reset(info);
3813
3814         info->rx_enabled = false;
3815         info->rx_restart = false;
3816 }
3817
3818 static void rx_start(struct slgt_info *info)
3819 {
3820         unsigned short val;
3821
3822         slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3823
3824         /* clear pending rx overrun IRQ */
3825         wr_reg16(info, SSR, IRQ_RXOVER);
3826
3827         /* reset and disable receiver */
3828         val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3829         wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3830         wr_reg16(info, RCR, val);                  /* clear reset bit */
3831
3832         rdma_reset(info);
3833         reset_rbufs(info);
3834
3835         /* set 1st descriptor address */
3836         wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3837
3838         if (info->params.mode != MGSL_MODE_ASYNC) {
3839                 /* enable rx DMA and DMA interrupt */
3840                 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3841         } else {
3842                 /* enable saving of rx status, rx DMA and DMA interrupt */
3843                 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3844         }
3845
3846         slgt_irq_on(info, IRQ_RXOVER);
3847
3848         /* enable receiver */
3849         wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3850
3851         info->rx_restart = false;
3852         info->rx_enabled = true;
3853 }
3854
3855 static void tx_start(struct slgt_info *info)
3856 {
3857         if (!info->tx_enabled) {
3858                 wr_reg16(info, TCR,
3859                          (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3860                 info->tx_enabled = true;
3861         }
3862
3863         if (info->tx_count) {
3864                 info->drop_rts_on_tx_done = false;
3865
3866                 if (info->params.mode != MGSL_MODE_ASYNC) {
3867                         if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3868                                 get_signals(info);
3869                                 if (!(info->signals & SerialSignal_RTS)) {
3870                                         info->signals |= SerialSignal_RTS;
3871                                         set_signals(info);
3872                                         info->drop_rts_on_tx_done = true;
3873                                 }
3874                         }
3875
3876                         slgt_irq_off(info, IRQ_TXDATA);
3877                         slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3878                         /* clear tx idle and underrun status bits */
3879                         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3880                         if (info->params.mode == MGSL_MODE_HDLC)
3881                                 mod_timer(&info->tx_timer, jiffies +
3882                                                 msecs_to_jiffies(5000));
3883                 } else {
3884                         slgt_irq_off(info, IRQ_TXDATA);
3885                         slgt_irq_on(info, IRQ_TXIDLE);
3886                         /* clear tx idle status bit */
3887                         wr_reg16(info, SSR, IRQ_TXIDLE);
3888                 }
3889                 tdma_start(info);
3890                 info->tx_active = true;
3891         }
3892 }
3893
3894 /*
3895  * start transmit DMA if inactive and there are unsent buffers
3896  */
3897 static void tdma_start(struct slgt_info *info)
3898 {
3899         unsigned int i;
3900
3901         if (rd_reg32(info, TDCSR) & BIT0)
3902                 return;
3903
3904         /* transmit DMA inactive, check for unsent buffers */
3905         i = info->tbuf_start;
3906         while (!desc_count(info->tbufs[i])) {
3907                 if (++i == info->tbuf_count)
3908                         i = 0;
3909                 if (i == info->tbuf_current)
3910                         return;
3911         }
3912         info->tbuf_start = i;
3913
3914         /* there are unsent buffers, start transmit DMA */
3915
3916         /* reset needed if previous error condition */
3917         tdma_reset(info);
3918
3919         /* set 1st descriptor address */
3920         wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3921         wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3922 }
3923
3924 static void tx_stop(struct slgt_info *info)
3925 {
3926         unsigned short val;
3927
3928         del_timer(&info->tx_timer);
3929
3930         tdma_reset(info);
3931
3932         /* reset and disable transmitter */
3933         val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
3934         wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3935
3936         slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3937
3938         /* clear tx idle and underrun status bit */
3939         wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3940
3941         reset_tbufs(info);
3942
3943         info->tx_enabled = false;
3944         info->tx_active = false;
3945 }
3946
3947 static void reset_port(struct slgt_info *info)
3948 {
3949         if (!info->reg_addr)
3950                 return;
3951
3952         tx_stop(info);
3953         rx_stop(info);
3954
3955         info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
3956         set_signals(info);
3957
3958         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3959 }
3960
3961 static void reset_adapter(struct slgt_info *info)
3962 {
3963         int i;
3964         for (i=0; i < info->port_count; ++i) {
3965                 if (info->port_array[i])
3966                         reset_port(info->port_array[i]);
3967         }
3968 }
3969
3970 static void async_mode(struct slgt_info *info)
3971 {
3972         unsigned short val;
3973
3974         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3975         tx_stop(info);
3976         rx_stop(info);
3977
3978         /* TCR (tx control)
3979          *
3980          * 15..13  mode, 010=async
3981          * 12..10  encoding, 000=NRZ
3982          * 09      parity enable
3983          * 08      1=odd parity, 0=even parity
3984          * 07      1=RTS driver control
3985          * 06      1=break enable
3986          * 05..04  character length
3987          *         00=5 bits
3988          *         01=6 bits
3989          *         10=7 bits
3990          *         11=8 bits
3991          * 03      0=1 stop bit, 1=2 stop bits
3992          * 02      reset
3993          * 01      enable
3994          * 00      auto-CTS enable
3995          */
3996         val = 0x4000;
3997
3998         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
3999                 val |= BIT7;
4000
4001         if (info->params.parity != ASYNC_PARITY_NONE) {
4002                 val |= BIT9;
4003                 if (info->params.parity == ASYNC_PARITY_ODD)
4004                         val |= BIT8;
4005         }
4006
4007         switch (info->params.data_bits)
4008         {
4009         case 6: val |= BIT4; break;
4010         case 7: val |= BIT5; break;
4011         case 8: val |= BIT5 + BIT4; break;
4012         }
4013
4014         if (info->params.stop_bits != 1)
4015                 val |= BIT3;
4016
4017         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4018                 val |= BIT0;
4019
4020         wr_reg16(info, TCR, val);
4021
4022         /* RCR (rx control)
4023          *
4024          * 15..13  mode, 010=async
4025          * 12..10  encoding, 000=NRZ
4026          * 09      parity enable
4027          * 08      1=odd parity, 0=even parity
4028          * 07..06  reserved, must be 0
4029          * 05..04  character length
4030          *         00=5 bits
4031          *         01=6 bits
4032          *         10=7 bits
4033          *         11=8 bits
4034          * 03      reserved, must be zero
4035          * 02      reset
4036          * 01      enable
4037          * 00      auto-DCD enable
4038          */
4039         val = 0x4000;
4040
4041         if (info->params.parity != ASYNC_PARITY_NONE) {
4042                 val |= BIT9;
4043                 if (info->params.parity == ASYNC_PARITY_ODD)
4044                         val |= BIT8;
4045         }
4046
4047         switch (info->params.data_bits)
4048         {
4049         case 6: val |= BIT4; break;
4050         case 7: val |= BIT5; break;
4051         case 8: val |= BIT5 + BIT4; break;
4052         }
4053
4054         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4055                 val |= BIT0;
4056
4057         wr_reg16(info, RCR, val);
4058
4059         /* CCR (clock control)
4060          *
4061          * 07..05  011 = tx clock source is BRG/16
4062          * 04..02  010 = rx clock source is BRG
4063          * 01      0 = auxclk disabled
4064          * 00      1 = BRG enabled
4065          *
4066          * 0110 1001
4067          */
4068         wr_reg8(info, CCR, 0x69);
4069
4070         msc_set_vcr(info);
4071
4072         /* SCR (serial control)
4073          *
4074          * 15  1=tx req on FIFO half empty
4075          * 14  1=rx req on FIFO half full
4076          * 13  tx data  IRQ enable
4077          * 12  tx idle  IRQ enable
4078          * 11  rx break on IRQ enable
4079          * 10  rx data  IRQ enable
4080          * 09  rx break off IRQ enable
4081          * 08  overrun  IRQ enable
4082          * 07  DSR      IRQ enable
4083          * 06  CTS      IRQ enable
4084          * 05  DCD      IRQ enable
4085          * 04  RI       IRQ enable
4086          * 03  reserved, must be zero
4087          * 02  1=txd->rxd internal loopback enable
4088          * 01  reserved, must be zero
4089          * 00  1=master IRQ enable
4090          */
4091         val = BIT15 + BIT14 + BIT0;
4092         wr_reg16(info, SCR, val);
4093
4094         slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4095
4096         set_rate(info, info->params.data_rate * 16);
4097
4098         if (info->params.loopback)
4099                 enable_loopback(info);
4100 }
4101
4102 static void sync_mode(struct slgt_info *info)
4103 {
4104         unsigned short val;
4105
4106         slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4107         tx_stop(info);
4108         rx_stop(info);
4109
4110         /* TCR (tx control)
4111          *
4112          * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4113          * 12..10  encoding
4114          * 09      CRC enable
4115          * 08      CRC32
4116          * 07      1=RTS driver control
4117          * 06      preamble enable
4118          * 05..04  preamble length
4119          * 03      share open/close flag
4120          * 02      reset
4121          * 01      enable
4122          * 00      auto-CTS enable
4123          */
4124         val = BIT2;
4125
4126         switch(info->params.mode) {
4127         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4128         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4129         case MGSL_MODE_RAW:      val |= BIT13; break;
4130         }
4131         if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4132                 val |= BIT7;
4133
4134         switch(info->params.encoding)
4135         {
4136         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4137         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4138         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4139         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4140         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4141         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4142         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4143         }
4144
4145         switch (info->params.crc_type & HDLC_CRC_MASK)
4146         {
4147         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4148         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4149         }
4150
4151         if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4152                 val |= BIT6;
4153
4154         switch (info->params.preamble_length)
4155         {
4156         case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4157         case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4158         case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4159         }
4160
4161         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4162                 val |= BIT0;
4163
4164         wr_reg16(info, TCR, val);
4165
4166         /* TPR (transmit preamble) */
4167
4168         switch (info->params.preamble)
4169         {
4170         case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4171         case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
4172         case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4173         case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
4174         case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
4175         default:                          val = 0x7e; break;
4176         }
4177         wr_reg8(info, TPR, (unsigned char)val);
4178
4179         /* RCR (rx control)
4180          *
4181          * 15..13  mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4182          * 12..10  encoding
4183          * 09      CRC enable
4184          * 08      CRC32
4185          * 07..03  reserved, must be 0
4186          * 02      reset
4187          * 01      enable
4188          * 00      auto-DCD enable
4189          */
4190         val = 0;
4191
4192         switch(info->params.mode) {
4193         case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4194         case MGSL_MODE_BISYNC:   val |= BIT15; break;
4195         case MGSL_MODE_RAW:      val |= BIT13; break;
4196         }
4197
4198         switch(info->params.encoding)
4199         {
4200         case HDLC_ENCODING_NRZB:          val |= BIT10; break;
4201         case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
4202         case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
4203         case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
4204         case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4205         case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4206         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4207         }
4208
4209         switch (info->params.crc_type & HDLC_CRC_MASK)
4210         {
4211         case HDLC_CRC_16_CCITT: val |= BIT9; break;
4212         case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4213         }
4214
4215         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4216                 val |= BIT0;
4217
4218         wr_reg16(info, RCR, val);
4219
4220         /* CCR (clock control)
4221          *
4222          * 07..05  tx clock source
4223          * 04..02  rx clock source
4224          * 01      auxclk enable
4225          * 00      BRG enable
4226          */
4227         val = 0;
4228
4229         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4230         {
4231                 // when RxC source is DPLL, BRG generates 16X DPLL
4232                 // reference clock, so take TxC from BRG/16 to get
4233                 // transmit clock at actual data rate
4234                 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4235                         val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
4236                 else
4237                         val |= BIT6;    /* 010, txclk = BRG */
4238         }
4239         else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4240                 val |= BIT7;    /* 100, txclk = DPLL Input */
4241         else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4242                 val |= BIT5;    /* 001, txclk = RXC Input */
4243
4244         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4245                 val |= BIT3;    /* 010, rxclk = BRG */
4246         else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4247                 val |= BIT4;    /* 100, rxclk = DPLL */
4248         else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4249                 val |= BIT2;    /* 001, rxclk = TXC Input */
4250
4251         if (info->params.clock_speed)
4252                 val |= BIT1 + BIT0;
4253
4254         wr_reg8(info, CCR, (unsigned char)val);
4255
4256         if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4257         {
4258                 // program DPLL mode
4259                 switch(info->params.encoding)
4260                 {
4261                 case HDLC_ENCODING_BIPHASE_MARK:
4262                 case HDLC_ENCODING_BIPHASE_SPACE:
4263                         val = BIT7; break;
4264                 case HDLC_ENCODING_BIPHASE_LEVEL:
4265                 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4266                         val = BIT7 + BIT6; break;
4267                 default: val = BIT6;    // NRZ encodings
4268                 }
4269                 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4270
4271                 // DPLL requires a 16X reference clock from BRG
4272                 set_rate(info, info->params.clock_speed * 16);
4273         }
4274         else
4275                 set_rate(info, info->params.clock_speed);
4276
4277         tx_set_idle(info);
4278
4279         msc_set_vcr(info);
4280
4281         /* SCR (serial control)
4282          *
4283          * 15  1=tx req on FIFO half empty
4284          * 14  1=rx req on FIFO half full
4285          * 13  tx data  IRQ enable
4286          * 12  tx idle  IRQ enable
4287          * 11  underrun IRQ enable
4288          * 10  rx data  IRQ enable
4289          * 09  rx idle  IRQ enable
4290          * 08  overrun  IRQ enable
4291          * 07  DSR      IRQ enable
4292          * 06  CTS      IRQ enable
4293          * 05  DCD      IRQ enable
4294          * 04  RI       IRQ enable
4295          * 03  reserved, must be zero
4296          * 02  1=txd->rxd internal loopback enable
4297          * 01  reserved, must be zero
4298          * 00  1=master IRQ enable
4299          */
4300         wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4301
4302         if (info->params.loopback)
4303                 enable_loopback(info);
4304 }
4305
4306 /*
4307  *  set transmit idle mode
4308  */
4309 static void tx_set_idle(struct slgt_info *info)
4310 {
4311         unsigned char val;
4312         unsigned short tcr;
4313
4314         /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4315          * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4316          */
4317         tcr = rd_reg16(info, TCR);
4318         if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4319                 /* disable preamble, set idle size to 16 bits */
4320                 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4321                 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4322                 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4323         } else if (!(tcr & BIT6)) {
4324                 /* preamble is disabled, set idle size to 8 bits */
4325                 tcr &= ~(BIT5 + BIT4);
4326         }
4327         wr_reg16(info, TCR, tcr);
4328
4329         if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4330                 /* LSB of custom tx idle specified in tx idle register */
4331                 val = (unsigned char)(info->idle_mode & 0xff);
4332         } else {
4333                 /* standard 8 bit idle patterns */
4334                 switch(info->idle_mode)
4335                 {
4336                 case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
4337                 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4338                 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4339                 case HDLC_TXIDLE_ZEROS:
4340                 case HDLC_TXIDLE_SPACE:          val = 0x00; break;
4341                 default:                         val = 0xff;
4342                 }
4343         }
4344
4345         wr_reg8(info, TIR, val);
4346 }
4347
4348 /*
4349  * get state of V24 status (input) signals
4350  */
4351 static void get_signals(struct slgt_info *info)
4352 {
4353         unsigned short status = rd_reg16(info, SSR);
4354
4355         /* clear all serial signals except DTR and RTS */
4356         info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4357
4358         if (status & BIT3)
4359                 info->signals |= SerialSignal_DSR;
4360         if (status & BIT2)
4361                 info->signals |= SerialSignal_CTS;
4362         if (status & BIT1)
4363                 info->signals |= SerialSignal_DCD;
4364         if (status & BIT0)
4365                 info->signals |= SerialSignal_RI;
4366 }
4367
4368 /*
4369  * set V.24 Control Register based on current configuration
4370  */
4371 static void msc_set_vcr(struct slgt_info *info)
4372 {
4373         unsigned char val = 0;
4374
4375         /* VCR (V.24 control)
4376          *
4377          * 07..04  serial IF select
4378          * 03      DTR
4379          * 02      RTS
4380          * 01      LL
4381          * 00      RL
4382          */
4383
4384         switch(info->if_mode & MGSL_INTERFACE_MASK)
4385         {
4386         case MGSL_INTERFACE_RS232:
4387                 val |= BIT5; /* 0010 */
4388                 break;
4389         case MGSL_INTERFACE_V35:
4390                 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4391                 break;
4392         case MGSL_INTERFACE_RS422:
4393                 val |= BIT6; /* 0100 */
4394                 break;
4395         }
4396
4397         if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4398                 val |= BIT4;
4399         if (info->signals & SerialSignal_DTR)
4400                 val |= BIT3;
4401         if (info->signals & SerialSignal_RTS)
4402                 val |= BIT2;
4403         if (info->if_mode & MGSL_INTERFACE_LL)
4404                 val |= BIT1;
4405         if (info->if_mode & MGSL_INTERFACE_RL)
4406                 val |= BIT0;
4407         wr_reg8(info, VCR, val);
4408 }
4409
4410 /*
4411  * set state of V24 control (output) signals
4412  */
4413 static void set_signals(struct slgt_info *info)
4414 {
4415         unsigned char val = rd_reg8(info, VCR);
4416         if (info->signals & SerialSignal_DTR)
4417                 val |= BIT3;
4418         else
4419                 val &= ~BIT3;
4420         if (info->signals & SerialSignal_RTS)
4421                 val |= BIT2;
4422         else
4423                 val &= ~BIT2;
4424         wr_reg8(info, VCR, val);
4425 }
4426
4427 /*
4428  * free range of receive DMA buffers (i to last)
4429  */
4430 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4431 {
4432         int done = 0;
4433
4434         while(!done) {
4435                 /* reset current buffer for reuse */
4436                 info->rbufs[i].status = 0;
4437                 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4438                 if (i == last)
4439                         done = 1;
4440                 if (++i == info->rbuf_count)
4441                         i = 0;
4442         }
4443         info->rbuf_current = i;
4444 }
4445
4446 /*
4447  * mark all receive DMA buffers as free
4448  */
4449 static void reset_rbufs(struct slgt_info *info)
4450 {
4451         free_rbufs(info, 0, info->rbuf_count - 1);
4452 }
4453
4454 /*
4455  * pass receive HDLC frame to upper layer
4456  *
4457  * return true if frame available, otherwise false
4458  */
4459 static bool rx_get_frame(struct slgt_info *info)
4460 {
4461         unsigned int start, end;
4462         unsigned short status;
4463         unsigned int framesize = 0;
4464         unsigned long flags;
4465         struct tty_struct *tty = info->port.tty;
4466         unsigned char addr_field = 0xff;
4467         unsigned int crc_size = 0;
4468
4469         switch (info->params.crc_type & HDLC_CRC_MASK) {
4470         case HDLC_CRC_16_CCITT: crc_size = 2; break;
4471         case HDLC_CRC_32_CCITT: crc_size = 4; break;
4472         }
4473
4474 check_again:
4475
4476         framesize = 0;
4477         addr_field = 0xff;
4478         start = end = info->rbuf_current;
4479
4480         for (;;) {
4481                 if (!desc_complete(info->rbufs[end]))
4482                         goto cleanup;
4483
4484                 if (framesize == 0 && info->params.addr_filter != 0xff)
4485                         addr_field = info->rbufs[end].buf[0];
4486
4487                 framesize += desc_count(info->rbufs[end]);
4488
4489                 if (desc_eof(info->rbufs[end]))
4490                         break;
4491
4492                 if (++end == info->rbuf_count)
4493                         end = 0;
4494
4495                 if (end == info->rbuf_current) {
4496                         if (info->rx_enabled){
4497                                 spin_lock_irqsave(&info->lock,flags);
4498                                 rx_start(info);
4499                                 spin_unlock_irqrestore(&info->lock,flags);
4500                         }
4501                         goto cleanup;
4502                 }
4503         }
4504
4505         /* status
4506          *
4507          * 15      buffer complete
4508          * 14..06  reserved
4509          * 05..04  residue
4510          * 02      eof (end of frame)
4511          * 01      CRC error
4512          * 00      abort
4513          */
4514         status = desc_status(info->rbufs[end]);
4515
4516         /* ignore CRC bit if not using CRC (bit is undefined) */
4517         if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4518                 status &= ~BIT1;
4519
4520         if (framesize == 0 ||
4521                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4522                 free_rbufs(info, start, end);
4523                 goto check_again;
4524         }
4525
4526         if (framesize < (2 + crc_size) || status & BIT0) {
4527                 info->icount.rxshort++;
4528                 framesize = 0;
4529         } else if (status & BIT1) {
4530                 info->icount.rxcrc++;
4531                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4532                         framesize = 0;
4533         }
4534
4535 #if SYNCLINK_GENERIC_HDLC
4536         if (framesize == 0) {
4537                 info->netdev->stats.rx_errors++;
4538                 info->netdev->stats.rx_frame_errors++;
4539         }
4540 #endif
4541
4542         DBGBH(("%s rx frame status=%04X size=%d\n",
4543                 info->device_name, status, framesize));
4544         DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4545
4546         if (framesize) {
4547                 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4548                         framesize -= crc_size;
4549                         crc_size = 0;
4550                 }
4551
4552                 if (framesize > info->max_frame_size + crc_size)
4553                         info->icount.rxlong++;
4554                 else {
4555                         /* copy dma buffer(s) to contiguous temp buffer */
4556                         int copy_count = framesize;
4557                         int i = start;
4558                         unsigned char *p = info->tmp_rbuf;
4559                         info->tmp_rbuf_count = framesize;
4560
4561                         info->icount.rxok++;
4562
4563                         while(copy_count) {
4564                                 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4565                                 memcpy(p, info->rbufs[i].buf, partial_count);
4566                                 p += partial_count;
4567                                 copy_count -= partial_count;
4568                                 if (++i == info->rbuf_count)
4569                                         i = 0;
4570                         }
4571
4572                         if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4573                                 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4574                                 framesize++;
4575                         }
4576
4577 #if SYNCLINK_GENERIC_HDLC
4578                         if (info->netcount)
4579                                 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4580                         else
4581 #endif
4582                                 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4583                 }
4584         }
4585         free_rbufs(info, start, end);
4586         return true;
4587
4588 cleanup:
4589         return false;
4590 }
4591
4592 /*
4593  * pass receive buffer (RAW synchronous mode) to tty layer
4594  * return true if buffer available, otherwise false
4595  */
4596 static bool rx_get_buf(struct slgt_info *info)
4597 {
4598         unsigned int i = info->rbuf_current;
4599         unsigned int count;
4600
4601         if (!desc_complete(info->rbufs[i]))
4602                 return false;
4603         count = desc_count(info->rbufs[i]);
4604         switch(info->params.mode) {
4605         case MGSL_MODE_MONOSYNC:
4606         case MGSL_MODE_BISYNC:
4607                 /* ignore residue in byte synchronous modes */
4608                 if (desc_residue(info->rbufs[i]))
4609                         count--;
4610                 break;
4611         }
4612         DBGDATA(info, info->rbufs[i].buf, count, "rx");
4613         DBGINFO(("rx_get_buf size=%d\n", count));
4614         if (count)
4615                 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4616                                   info->flag_buf, count);
4617         free_rbufs(info, i, i);
4618         return true;
4619 }
4620
4621 static void reset_tbufs(struct slgt_info *info)
4622 {
4623         unsigned int i;
4624         info->tbuf_current = 0;
4625         for (i=0 ; i < info->tbuf_count ; i++) {
4626                 info->tbufs[i].status = 0;
4627                 info->tbufs[i].count  = 0;
4628         }
4629 }
4630
4631 /*
4632  * return number of free transmit DMA buffers
4633  */
4634 static unsigned int free_tbuf_count(struct slgt_info *info)
4635 {
4636         unsigned int count = 0;
4637         unsigned int i = info->tbuf_current;
4638
4639         do
4640         {
4641                 if (desc_count(info->tbufs[i]))
4642                         break; /* buffer in use */
4643                 ++count;
4644                 if (++i == info->tbuf_count)
4645                         i=0;
4646         } while (i != info->tbuf_current);
4647
4648         /* if tx DMA active, last zero count buffer is in use */
4649         if (count && (rd_reg32(info, TDCSR) & BIT0))
4650                 --count;
4651
4652         return count;
4653 }
4654
4655 /*
4656  * return number of bytes in unsent transmit DMA buffers
4657  * and the serial controller tx FIFO
4658  */
4659 static unsigned int tbuf_bytes(struct slgt_info *info)
4660 {
4661         unsigned int total_count = 0;
4662         unsigned int i = info->tbuf_current;
4663         unsigned int reg_value;
4664         unsigned int count;
4665         unsigned int active_buf_count = 0;
4666
4667         /*
4668          * Add descriptor counts for all tx DMA buffers.
4669          * If count is zero (cleared by DMA controller after read),
4670          * the buffer is complete or is actively being read from.
4671          *
4672          * Record buf_count of last buffer with zero count starting
4673          * from current ring position. buf_count is mirror
4674          * copy of count and is not cleared by serial controller.
4675          * If DMA controller is active, that buffer is actively
4676          * being read so add to total.
4677          */
4678         do {
4679                 count = desc_count(info->tbufs[i]);
4680                 if (count)
4681                         total_count += count;
4682                 else if (!total_count)
4683                         active_buf_count = info->tbufs[i].buf_count;
4684                 if (++i == info->tbuf_count)
4685                         i = 0;
4686         } while (i != info->tbuf_current);
4687
4688         /* read tx DMA status register */
4689         reg_value = rd_reg32(info, TDCSR);
4690
4691         /* if tx DMA active, last zero count buffer is in use */
4692         if (reg_value & BIT0)
4693                 total_count += active_buf_count;
4694
4695         /* add tx FIFO count = reg_value[15..8] */
4696         total_count += (reg_value >> 8) & 0xff;
4697
4698         /* if transmitter active add one byte for shift register */
4699         if (info->tx_active)
4700                 total_count++;
4701
4702         return total_count;
4703 }
4704
4705 /*
4706  * load transmit DMA buffer(s) with data
4707  */
4708 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4709 {
4710         unsigned short count;
4711         unsigned int i;
4712         struct slgt_desc *d;
4713
4714         if (size == 0)
4715                 return;
4716
4717         DBGDATA(info, buf, size, "tx");
4718
4719         info->tbuf_start = i = info->tbuf_current;
4720
4721         while (size) {
4722                 d = &info->tbufs[i];
4723                 if (++i == info->tbuf_count)
4724                         i = 0;
4725
4726                 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4727                 memcpy(d->buf, buf, count);
4728
4729                 size -= count;
4730                 buf  += count;
4731
4732                 /*
4733                  * set EOF bit for last buffer of HDLC frame or
4734                  * for every buffer in raw mode
4735                  */
4736                 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4737                     info->params.mode == MGSL_MODE_RAW)
4738                         set_desc_eof(*d, 1);
4739                 else
4740                         set_desc_eof(*d, 0);
4741
4742                 set_desc_count(*d, count);
4743                 d->buf_count = count;
4744         }
4745
4746         info->tbuf_current = i;
4747 }
4748
4749 static int register_test(struct slgt_info *info)
4750 {
4751         static unsigned short patterns[] =
4752                 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4753         static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4754         unsigned int i;
4755         int rc = 0;
4756
4757         for (i=0 ; i < count ; i++) {
4758                 wr_reg16(info, TIR, patterns[i]);
4759                 wr_reg16(info, BDR, patterns[(i+1)%count]);
4760                 if ((rd_reg16(info, TIR) != patterns[i]) ||
4761                     (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4762                         rc = -ENODEV;
4763                         break;
4764                 }
4765         }
4766         info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4767         info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4768         return rc;
4769 }
4770
4771 static int irq_test(struct slgt_info *info)
4772 {
4773         unsigned long timeout;
4774         unsigned long flags;
4775         struct tty_struct *oldtty = info->port.tty;
4776         u32 speed = info->params.data_rate;
4777
4778         info->params.data_rate = 921600;
4779         info->port.tty = NULL;
4780
4781         spin_lock_irqsave(&info->lock, flags);
4782         async_mode(info);
4783         slgt_irq_on(info, IRQ_TXIDLE);
4784
4785         /* enable transmitter */
4786         wr_reg16(info, TCR,
4787                 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4788
4789         /* write one byte and wait for tx idle */
4790         wr_reg16(info, TDR, 0);
4791
4792         /* assume failure */
4793         info->init_error = DiagStatus_IrqFailure;
4794         info->irq_occurred = false;
4795
4796         spin_unlock_irqrestore(&info->lock, flags);
4797
4798         timeout=100;
4799         while(timeout-- && !info->irq_occurred)
4800                 msleep_interruptible(10);
4801
4802         spin_lock_irqsave(&info->lock,flags);
4803         reset_port(info);
4804         spin_unlock_irqrestore(&info->lock,flags);
4805
4806         info->params.data_rate = speed;
4807         info->port.tty = oldtty;
4808
4809         info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4810         return info->irq_occurred ? 0 : -ENODEV;
4811 }
4812
4813 static int loopback_test_rx(struct slgt_info *info)
4814 {
4815         unsigned char *src, *dest;
4816         int count;
4817
4818         if (desc_complete(info->rbufs[0])) {
4819                 count = desc_count(info->rbufs[0]);
4820                 src   = info->rbufs[0].buf;
4821                 dest  = info->tmp_rbuf;
4822
4823                 for( ; count ; count-=2, src+=2) {
4824                         /* src=data byte (src+1)=status byte */
4825                         if (!(*(src+1) & (BIT9 + BIT8))) {
4826                                 *dest = *src;
4827                                 dest++;
4828                                 info->tmp_rbuf_count++;
4829                         }
4830                 }
4831                 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4832                 return 1;
4833         }
4834         return 0;
4835 }
4836
4837 static int loopback_test(struct slgt_info *info)
4838 {
4839 #define TESTFRAMESIZE 20
4840
4841         unsigned long timeout;
4842         u16 count = TESTFRAMESIZE;
4843         unsigned char buf[TESTFRAMESIZE];
4844         int rc = -ENODEV;
4845         unsigned long flags;
4846
4847         struct tty_struct *oldtty = info->port.tty;
4848         MGSL_PARAMS params;
4849
4850         memcpy(&params, &info->params, sizeof(params));
4851
4852         info->params.mode = MGSL_MODE_ASYNC;
4853         info->params.data_rate = 921600;
4854         info->params.loopback = 1;
4855         info->port.tty = NULL;
4856
4857         /* build and send transmit frame */
4858         for (count = 0; count < TESTFRAMESIZE; ++count)
4859                 buf[count] = (unsigned char)count;
4860
4861         info->tmp_rbuf_count = 0;
4862         memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4863
4864         /* program hardware for HDLC and enabled receiver */
4865         spin_lock_irqsave(&info->lock,flags);
4866         async_mode(info);
4867         rx_start(info);
4868         info->tx_count = count;
4869         tx_load(info, buf, count);
4870         tx_start(info);
4871         spin_unlock_irqrestore(&info->lock, flags);
4872
4873         /* wait for receive complete */
4874         for (timeout = 100; timeout; --timeout) {
4875                 msleep_interruptible(10);
4876                 if (loopback_test_rx(info)) {
4877                         rc = 0;
4878                         break;
4879                 }
4880         }
4881
4882         /* verify received frame length and contents */
4883         if (!rc && (info->tmp_rbuf_count != count ||
4884                   memcmp(buf, info->tmp_rbuf, count))) {
4885                 rc = -ENODEV;
4886         }
4887
4888         spin_lock_irqsave(&info->lock,flags);
4889         reset_adapter(info);
4890         spin_unlock_irqrestore(&info->lock,flags);
4891
4892         memcpy(&info->params, &params, sizeof(info->params));
4893         info->port.tty = oldtty;
4894
4895         info->init_error = rc ? DiagStatus_DmaFailure : 0;
4896         return rc;
4897 }
4898
4899 static int adapter_test(struct slgt_info *info)
4900 {
4901         DBGINFO(("testing %s\n", info->device_name));
4902         if (register_test(info) < 0) {
4903                 printk("register test failure %s addr=%08X\n",
4904                         info->device_name, info->phys_reg_addr);
4905         } else if (irq_test(info) < 0) {
4906                 printk("IRQ test failure %s IRQ=%d\n",
4907                         info->device_name, info->irq_level);
4908         } else if (loopback_test(info) < 0) {
4909                 printk("loopback test failure %s\n", info->device_name);
4910         }
4911         return info->init_error;
4912 }
4913
4914 /*
4915  * transmit timeout handler
4916  */
4917 static void tx_timeout(unsigned long context)
4918 {
4919         struct slgt_info *info = (struct slgt_info*)context;
4920         unsigned long flags;
4921
4922         DBGINFO(("%s tx_timeout\n", info->device_name));
4923         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
4924                 info->icount.txtimeout++;
4925         }
4926         spin_lock_irqsave(&info->lock,flags);
4927         info->tx_active = false;
4928         info->tx_count = 0;
4929         spin_unlock_irqrestore(&info->lock,flags);
4930
4931 #if SYNCLINK_GENERIC_HDLC
4932         if (info->netcount)
4933                 hdlcdev_tx_done(info);
4934         else
4935 #endif
4936                 bh_transmit(info);
4937 }
4938
4939 /*
4940  * receive buffer polling timer
4941  */
4942 static void rx_timeout(unsigned long context)
4943 {
4944         struct slgt_info *info = (struct slgt_info*)context;
4945         unsigned long flags;
4946
4947         DBGINFO(("%s rx_timeout\n", info->device_name));
4948         spin_lock_irqsave(&info->lock, flags);
4949         info->pending_bh |= BH_RECEIVE;
4950         spin_unlock_irqrestore(&info->lock, flags);
4951         bh_handler(&info->task);
4952 }
4953