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   1 /*
   2  * Simple synchronous serial port driver for ETRAX FS.
   3  *
   4  * Copyright (c) 2005 Axis Communications AB
   5  *
   6  * Author: Mikael Starvik
   7  *
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/config.h>
  13 #include <linux/types.h>
  14 #include <linux/errno.h>
  15 #include <linux/major.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/poll.h>
  20 #include <linux/init.h>
  21 #include <linux/timer.h>
  22 #include <linux/spinlock.h>
  23
  24 #include <asm/io.h>
  25 #include <asm/arch/dma.h>
  26 #include <asm/arch/pinmux.h>
  27 #include <asm/arch/hwregs/reg_rdwr.h>
  28 #include <asm/arch/hwregs/sser_defs.h>
  29 #include <asm/arch/hwregs/dma_defs.h>
  30 #include <asm/arch/hwregs/dma.h>
  31 #include <asm/arch/hwregs/intr_vect_defs.h>
  32 #include <asm/arch/hwregs/intr_vect.h>
  33 #include <asm/arch/hwregs/reg_map.h>
  34 #include <asm/sync_serial.h>
  35
  36 /* The receiver is a bit tricky beacuse of the continuous stream of data.*/
  37 /*                                                                       */
  38 /* Three DMA descriptors are linked together. Each DMA descriptor is     */
  39 /* responsible for port->bufchunk of a common buffer.                    */
  40 /*                                                                       */
  41 /* +---------------------------------------------+                       */
  42 /* |   +----------+   +----------+   +----------+ |                      */
  43 /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+                      */
  44 /*     +----------+   +----------+   +----------+                        */
  45 /*         |            |              |                                 */
  46 /*         v            v              v                                 */
  47 /*   +-------------------------------------+                             */
  48 /*   |        BUFFER                       |                             */
  49 /*   +-------------------------------------+                             */
  50 /*      |<- data_avail ->|                                               */
  51 /*    readp          writep                                              */
  52 /*                                                                       */
  53 /* If the application keeps up the pace readp will be right after writep.*/
  54 /* If the application can't keep the pace we have to throw away data.    */
  55 /* The idea is that readp should be ready with the data pointed out by   */
  56 /* Descr[i] when the DMA has filled in Descr[i+1].                       */
  57 /* Otherwise we will discard                                             */
  58 /* the rest of the data pointed out by Descr1 and set readp to the start */
  59 /* of Descr2                                                             */
  60
  61 #define SYNC_SERIAL_MAJOR 125
  62
  63 /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */
  64 /* words can be handled */
  65 #define IN_BUFFER_SIZE 12288
  66 #define IN_DESCR_SIZE 256
  67 #define NUM_IN_DESCR (IN_BUFFER_SIZE/IN_DESCR_SIZE)
  68 #define OUT_BUFFER_SIZE 4096
  69
  70 #define DEFAULT_FRAME_RATE 0
  71 #define DEFAULT_WORD_RATE 7
  72
  73 /* NOTE: Enabling some debug will likely cause overrun or underrun,
  74  * especially if manual mode is use.
  75  */
  76 #define DEBUG(x)
  77 #define DEBUGREAD(x)
  78 #define DEBUGWRITE(x)
  79 #define DEBUGPOLL(x)
  80 #define DEBUGRXINT(x)
  81 #define DEBUGTXINT(x)
  82
  83 typedef struct sync_port
  84 {
  85         reg_scope_instances regi_sser;
  86         reg_scope_instances regi_dmain;
  87         reg_scope_instances regi_dmaout;
  88
  89         char started; /* 1 if port has been started */
  90         char port_nbr; /* Port 0 or 1 */
  91         char busy; /* 1 if port is busy */
  92
  93         char enabled;  /* 1 if port is enabled */
  94         char use_dma;  /* 1 if port uses dma */
  95         char tr_running;
  96
  97         char init_irqs;
  98         int output;
  99         int input;
 100
 101         volatile unsigned int out_count; /* Remaining bytes for current transfer */
 102         unsigned char* outp; /* Current position in out_buffer */
 103         volatile unsigned char* volatile readp;  /* Next byte to be read by application */
 104         volatile unsigned char* volatile writep; /* Next byte to be written by etrax */
 105         unsigned int in_buffer_size;
 106         unsigned int inbufchunk;
 107         unsigned char out_buffer[OUT_BUFFER_SIZE] __attribute__ ((aligned(32)));
 108         unsigned char in_buffer[IN_BUFFER_SIZE]__attribute__ ((aligned(32)));
 109         unsigned char flip[IN_BUFFER_SIZE] __attribute__ ((aligned(32)));
 110         struct dma_descr_data* next_rx_desc;
 111         struct dma_descr_data* prev_rx_desc;
 112         int full;
 113
 114         dma_descr_data in_descr[NUM_IN_DESCR] __attribute__ ((__aligned__(16)));
 115         dma_descr_context in_context __attribute__ ((__aligned__(32)));
 116         dma_descr_data out_descr __attribute__ ((__aligned__(16)));
 117         dma_descr_context out_context __attribute__ ((__aligned__(32)));
 118         wait_queue_head_t out_wait_q;
 119         wait_queue_head_t in_wait_q;
 120
 121         spinlock_t lock;
 122 } sync_port;
 123
 124 static int etrax_sync_serial_init(void);
 125 static void initialize_port(int portnbr);
 126 static inline int sync_data_avail(struct sync_port *port);
 127
 128 static int sync_serial_open(struct inode *, struct file*);
 129 static int sync_serial_release(struct inode*, struct file*);
 130 static unsigned int sync_serial_poll(struct file *filp, poll_table *wait);
 131
 132 static int sync_serial_ioctl(struct inode*, struct file*,
 133                              unsigned int cmd, unsigned long arg);
 134 static ssize_t sync_serial_write(struct file * file, const char * buf,
 135                                  size_t count, loff_t *ppos);
 136 static ssize_t sync_serial_read(struct file *file, char *buf,
 137                                 size_t count, loff_t *ppos);
 138
 139 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
 140      defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
 141     (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
 142      defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
 143 #define SYNC_SER_DMA
 144 #endif
 145
 146 static void send_word(sync_port* port);
 147 static void start_dma(struct sync_port *port, const char* data, int count);
 148 static void start_dma_in(sync_port* port);
 149 #ifdef SYNC_SER_DMA
 150 static irqreturn_t tr_interrupt(int irq, void *dev_id, struct pt_regs * regs);
 151 static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs);
 152 #endif
 153
 154 #if (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \
 155      !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \
 156     (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \
 157      !defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))
 158 #define SYNC_SER_MANUAL
 159 #endif
 160 #ifdef SYNC_SER_MANUAL
 161 static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs);
 162 #endif
 163
 164 /* The ports */
 165 static struct sync_port ports[]=
 166 {
 167         {
 168                 .regi_sser             = regi_sser0,
 169                 .regi_dmaout           = regi_dma4,
 170                 .regi_dmain            = regi_dma5,
 171 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)
 172                 .use_dma               = 1,
 173 #else
 174                 .use_dma               = 0,
 175 #endif
 176         },
 177         {
 178                 .regi_sser             = regi_sser1,
 179                 .regi_dmaout           = regi_dma6,
 180                 .regi_dmain            = regi_dma7,
 181 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA)
 182                 .use_dma               = 1,
 183 #else
 184                 .use_dma               = 0,
 185 #endif
 186         }
 187 };
 188
 189 #define NUMBER_OF_PORTS (sizeof(ports)/sizeof(sync_port))
 190
 191 static struct file_operations sync_serial_fops = {
 192         .owner   = THIS_MODULE,
 193         .write   = sync_serial_write,
 194         .read    = sync_serial_read,
 195         .poll    = sync_serial_poll,
 196         .ioctl   = sync_serial_ioctl,
 197         .open    = sync_serial_open,
 198         .release = sync_serial_release
 199 };
 200
 201 static int __init etrax_sync_serial_init(void)
 202 {
 203         ports[0].enabled = 0;
 204         ports[1].enabled = 0;
 205
 206         if (register_chrdev(SYNC_SERIAL_MAJOR,"sync serial", &sync_serial_fops) <0 )
 207         {
 208                 printk("unable to get major for synchronous serial port\n");
 209                 return -EBUSY;
 210         }
 211
 212         /* Initialize Ports */
 213 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0)
 214         if (crisv32_pinmux_alloc_fixed(pinmux_sser0))
 215         {
 216                 printk("Unable to allocate pins for syncrhronous serial port 0\n");
 217                 return -EIO;
 218         }
 219         ports[0].enabled = 1;
 220         initialize_port(0);
 221 #endif
 222
 223 #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
 224         if (crisv32_pinmux_alloc_fixed(pinmux_sser1))
 225         {
 226                 printk("Unable to allocate pins for syncrhronous serial port 0\n");
 227                 return -EIO;
 228         }
 229         ports[1].enabled = 1;
 230         initialize_port(1);
 231 #endif
 232
 233         printk("ETRAX FS synchronous serial port driver\n");
 234         return 0;
 235 }
 236
 237 static void __init initialize_port(int portnbr)
 238 {
 239         struct sync_port* port = &ports[portnbr];
 240         reg_sser_rw_cfg cfg = {0};
 241         reg_sser_rw_frm_cfg frm_cfg = {0};
 242         reg_sser_rw_tr_cfg tr_cfg = {0};
 243         reg_sser_rw_rec_cfg rec_cfg = {0};
 244
 245         DEBUG(printk("Init sync serial port %d\n", portnbr));
 246
 247         port->port_nbr = portnbr;
 248         port->init_irqs = 1;
 249
 250         port->outp = port->out_buffer;
 251         port->output = 1;
 252         port->input = 0;
 253
 254         port->readp = port->flip;
 255         port->writep = port->flip;
 256         port->in_buffer_size = IN_BUFFER_SIZE;
 257         port->inbufchunk = IN_DESCR_SIZE;
 258         port->next_rx_desc = &port->in_descr[0];
 259         port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR-1];
 260         port->prev_rx_desc->eol = 1;
 261
 262         init_waitqueue_head(&port->out_wait_q);
 263         init_waitqueue_head(&port->in_wait_q);
 264
 265         spin_lock_init(&port->lock);
 266
 267         cfg.out_clk_src = regk_sser_intern_clk;
 268         cfg.out_clk_pol = regk_sser_pos;
 269         cfg.clk_od_mode = regk_sser_no;
 270         cfg.clk_dir = regk_sser_out;
 271         cfg.gate_clk = regk_sser_no;
 272         cfg.base_freq = regk_sser_f29_493;
 273         cfg.clk_div = 256;
 274         REG_WR(sser, port->regi_sser, rw_cfg, cfg);
 275
 276         frm_cfg.wordrate = DEFAULT_WORD_RATE;
 277         frm_cfg.type = regk_sser_edge;
 278         frm_cfg.frame_pin_dir = regk_sser_out;
 279         frm_cfg.frame_pin_use = regk_sser_frm;
 280         frm_cfg.status_pin_dir = regk_sser_in;
 281         frm_cfg.status_pin_use = regk_sser_hold;
 282         frm_cfg.out_on = regk_sser_tr;
 283         frm_cfg.tr_delay = 1;
 284         REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
 285
 286         tr_cfg.urun_stop = regk_sser_no;
 287         tr_cfg.sample_size = 7;
 288         tr_cfg.sh_dir = regk_sser_msbfirst;
 289         tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
 290         tr_cfg.rate_ctrl = regk_sser_bulk;
 291         tr_cfg.data_pin_use = regk_sser_dout;
 292         tr_cfg.bulk_wspace = 1;
 293         REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
 294
 295         rec_cfg.sample_size = 7;
 296         rec_cfg.sh_dir = regk_sser_msbfirst;
 297         rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no;
 298         rec_cfg.fifo_thr = regk_sser_inf;
 299         REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 300 }
 301
 302 static inline int sync_data_avail(struct sync_port *port)
 303 {
 304         int avail;
 305         unsigned char *start;
 306         unsigned char *end;
 307
 308         start = (unsigned char*)port->readp; /* cast away volatile */
 309         end = (unsigned char*)port->writep;  /* cast away volatile */
 310         /* 0123456789  0123456789
 311          *  -----      -    -----
 312          *  ^rp  ^wp    ^wp ^rp
 313          */
 314
 315         if (end >= start)
 316                 avail = end - start;
 317         else
 318                 avail = port->in_buffer_size - (start - end);
 319         return avail;
 320 }
 321
 322 static inline int sync_data_avail_to_end(struct sync_port *port)
 323 {
 324         int avail;
 325         unsigned char *start;
 326         unsigned char *end;
 327
 328         start = (unsigned char*)port->readp; /* cast away volatile */
 329         end = (unsigned char*)port->writep;  /* cast away volatile */
 330         /* 0123456789  0123456789
 331          *  -----           -----
 332          *  ^rp  ^wp    ^wp ^rp
 333          */
 334
 335         if (end >= start)
 336                 avail = end - start;
 337         else
 338                 avail = port->flip + port->in_buffer_size - start;
 339         return avail;
 340 }
 341
 342 static int sync_serial_open(struct inode *inode, struct file *file)
 343 {
 344         int dev = MINOR(inode->i_rdev);
 345         sync_port* port;
 346         reg_dma_rw_cfg cfg = {.en = regk_dma_yes};
 347         reg_dma_rw_intr_mask intr_mask = {.data = regk_dma_yes};
 348
 349         DEBUG(printk("Open sync serial port %d\n", dev));
 350
 351         if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
 352         {
 353                 DEBUG(printk("Invalid minor %d\n", dev));
 354                 return -ENODEV;
 355         }
 356         port = &ports[dev];
 357         /* Allow open this device twice (assuming one reader and one writer) */
 358         if (port->busy == 2)
 359         {
 360                 DEBUG(printk("Device is busy.. \n"));
 361                 return -EBUSY;
 362         }
 363         if (port->init_irqs) {
 364                 if (port->use_dma) {
 365                         if (port == &ports[0]){
 366 #ifdef SYNC_SER_DMA
 367                                 if(request_irq(DMA4_INTR_VECT,
 368                                                tr_interrupt,
 369                                                0,
 370                                                "synchronous serial 0 dma tr",
 371                                                &ports[0])) {
 372                                         printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
 373                                         return -EBUSY;
 374                                 } else if(request_irq(DMA5_INTR_VECT,
 375                                                       rx_interrupt,
 376                                                       0,
 377                                                       "synchronous serial 1 dma rx",
 378                                                       &ports[0])) {
 379                                         free_irq(DMA4_INTR_VECT, &port[0]);
 380                                         printk(KERN_CRIT "Can't allocate sync serial port 0 IRQ");
 381                                         return -EBUSY;
 382                                 } else if (crisv32_request_dma(SYNC_SER0_TX_DMA_NBR,
 383                                                                "synchronous serial 0 dma tr",
 384                                                                DMA_VERBOSE_ON_ERROR,
 385                                                                0,
 386                                                                dma_sser0)) {
 387                                         free_irq(DMA4_INTR_VECT, &port[0]);
 388                                         free_irq(DMA5_INTR_VECT, &port[0]);
 389                                         printk(KERN_CRIT "Can't allocate sync serial port 0 TX DMA channel");
 390                                         return -EBUSY;
 391                                 } else if (crisv32_request_dma(SYNC_SER0_RX_DMA_NBR,
 392                                                                "synchronous serial 0 dma rec",
 393                                                                DMA_VERBOSE_ON_ERROR,
 394                                                                0,
 395                                                                dma_sser0)) {
 396                                         crisv32_free_dma(SYNC_SER0_TX_DMA_NBR);
 397                                         free_irq(DMA4_INTR_VECT, &port[0]);
 398                                         free_irq(DMA5_INTR_VECT, &port[0]);
 399                                         printk(KERN_CRIT "Can't allocate sync serial port 1 RX DMA channel");
 400                                         return -EBUSY;
 401                                 }
 402 #endif
 403                         }
 404                         else if (port == &ports[1]){
 405 #ifdef SYNC_SER_DMA
 406                                 if (request_irq(DMA6_INTR_VECT,
 407                                                 tr_interrupt,
 408                                                 0,
 409                                                 "synchronous serial 1 dma tr",
 410                                                 &ports[1])) {
 411                                         printk(KERN_CRIT "Can't allocate sync serial port 1 IRQ");
 412                                         return -EBUSY;
 413                                 } else if (request_irq(DMA7_INTR_VECT,
 414                                                        rx_interrupt,
 415                                                        0,
 416                                                        "synchronous serial 1 dma rx",
 417                                                        &ports[1])) {
 418                                         free_irq(DMA6_INTR_VECT, &ports[1]);
 419                                         printk(KERN_CRIT "Can't allocate sync serial port 3 IRQ");
 420                                         return -EBUSY;
 421                                 } else if (crisv32_request_dma(SYNC_SER1_TX_DMA_NBR,
 422                                                                "synchronous serial 1 dma tr",
 423                                                                DMA_VERBOSE_ON_ERROR,
 424                                                                0,
 425                                                                dma_sser1)) {
 426                                         free_irq(21, &ports[1]);
 427                                         free_irq(20, &ports[1]);
 428                                         printk(KERN_CRIT "Can't allocate sync serial port 3 TX DMA channel");
 429                                         return -EBUSY;
 430                                 } else if (crisv32_request_dma(SYNC_SER1_RX_DMA_NBR,
 431                                                             "synchronous serial 3 dma rec",
 432                                                             DMA_VERBOSE_ON_ERROR,
 433                                                             0,
 434                                                             dma_sser1)) {
 435                                         crisv32_free_dma(SYNC_SER1_TX_DMA_NBR);
 436                                         free_irq(DMA6_INTR_VECT, &ports[1]);
 437                                         free_irq(DMA7_INTR_VECT, &ports[1]);
 438                                         printk(KERN_CRIT "Can't allocate sync serial port 3 RX DMA channel");
 439                                         return -EBUSY;
 440                                 }
 441 #endif
 442                         }
 443
 444                         /* Enable DMAs */
 445                         REG_WR(dma, port->regi_dmain, rw_cfg, cfg);
 446                         REG_WR(dma, port->regi_dmaout, rw_cfg, cfg);
 447                         /* Enable DMA IRQs */
 448                         REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask);
 449                         REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask);
 450                         /* Set up wordsize = 2 for DMAs. */
 451                         DMA_WR_CMD (port->regi_dmain, regk_dma_set_w_size1);
 452                         DMA_WR_CMD (port->regi_dmaout, regk_dma_set_w_size1);
 453
 454                         start_dma_in(port);
 455                         port->init_irqs = 0;
 456                 } else { /* !port->use_dma */
 457 #ifdef SYNC_SER_MANUAL
 458                         if (port == &ports[0]) {
 459                                 if (request_irq(SSER0_INTR_VECT,
 460                                                 manual_interrupt,
 461                                                 0,
 462                                                 "synchronous serial manual irq",
 463                                                 &ports[0])) {
 464                                         printk("Can't allocate sync serial manual irq");
 465                                         return -EBUSY;
 466                                 }
 467                         } else if (port == &ports[1]) {
 468                                 if (request_irq(SSER1_INTR_VECT,
 469                                                 manual_interrupt,
 470                                                 0,
 471                                                 "synchronous serial manual irq",
 472                                                 &ports[1])) {
 473                                         printk(KERN_CRIT "Can't allocate sync serial manual irq");
 474                                         return -EBUSY;
 475                                 }
 476                         }
 477                         port->init_irqs = 0;
 478 #else
 479                         panic("sync_serial: Manual mode not supported.\n");
 480 #endif /* SYNC_SER_MANUAL */
 481                 }
 482         } /* port->init_irqs */
 483
 484         port->busy++;
 485         return 0;
 486 }
 487
 488 static int sync_serial_release(struct inode *inode, struct file *file)
 489 {
 490         int dev = MINOR(inode->i_rdev);
 491         sync_port* port;
 492
 493         if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
 494         {
 495                 DEBUG(printk("Invalid minor %d\n", dev));
 496                 return -ENODEV;
 497         }
 498         port = &ports[dev];
 499         if (port->busy)
 500                 port->busy--;
 501         if (!port->busy)
 502           /* XXX */ ;
 503         return 0;
 504 }
 505
 506 static unsigned int sync_serial_poll(struct file *file, poll_table *wait)
 507 {
 508         int dev = MINOR(file->f_dentry->d_inode->i_rdev);
 509         unsigned int mask = 0;
 510         sync_port* port;
 511         DEBUGPOLL( static unsigned int prev_mask = 0; );
 512
 513         port = &ports[dev];
 514         poll_wait(file, &port->out_wait_q, wait);
 515         poll_wait(file, &port->in_wait_q, wait);
 516         /* Some room to write */
 517         if (port->out_count < OUT_BUFFER_SIZE)
 518                 mask |=  POLLOUT | POLLWRNORM;
 519         /* At least an inbufchunk of data */
 520         if (sync_data_avail(port) >= port->inbufchunk)
 521                 mask |= POLLIN | POLLRDNORM;
 522
 523         DEBUGPOLL(if (mask != prev_mask)
 524               printk("sync_serial_poll: mask 0x%08X %s %s\n", mask,
 525                      mask&POLLOUT?"POLLOUT":"", mask&POLLIN?"POLLIN":"");
 526               prev_mask = mask;
 527               );
 528         return mask;
 529 }
 530
 531 static int sync_serial_ioctl(struct inode *inode, struct file *file,
 532                   unsigned int cmd, unsigned long arg)
 533 {
 534         int return_val = 0;
 535         int dev = MINOR(file->f_dentry->d_inode->i_rdev);
 536         sync_port* port;
 537         reg_sser_rw_tr_cfg tr_cfg;
 538         reg_sser_rw_rec_cfg rec_cfg;
 539         reg_sser_rw_frm_cfg frm_cfg;
 540         reg_sser_rw_cfg gen_cfg;
 541         reg_sser_rw_intr_mask intr_mask;
 542
 543         if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
 544         {
 545                 DEBUG(printk("Invalid minor %d\n", dev));
 546                 return -1;
 547         }
 548         port = &ports[dev];
 549         spin_lock_irq(&port->lock);
 550
 551         tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
 552         rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
 553         frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg);
 554         gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg);
 555         intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
 556
 557         switch(cmd)
 558         {
 559         case SSP_SPEED:
 560                 if (GET_SPEED(arg) == CODEC)
 561                 {
 562                         gen_cfg.base_freq = regk_sser_f32;
 563                         /* FREQ = 0 => 4 MHz => clk_div = 7*/
 564                         gen_cfg.clk_div = 6 + (1 << GET_FREQ(arg));
 565                 }
 566                 else
 567                 {
 568                         gen_cfg.base_freq = regk_sser_f29_493;
 569                         switch (GET_SPEED(arg))
 570                         {
 571                                 case SSP150:
 572                                         gen_cfg.clk_div = 29493000 / (150 * 8) - 1;
 573                                         break;
 574                                 case SSP300:
 575                                         gen_cfg.clk_div = 29493000 / (300 * 8) - 1;
 576                                         break;
 577                                 case SSP600:
 578                                         gen_cfg.clk_div = 29493000 / (600 * 8) - 1;
 579                                         break;
 580                                 case SSP1200:
 581                                         gen_cfg.clk_div = 29493000 / (1200 * 8) - 1;
 582                                         break;
 583                                 case SSP2400:
 584                                         gen_cfg.clk_div = 29493000 / (2400 * 8) - 1;
 585                                         break;
 586                                 case SSP4800:
 587                                         gen_cfg.clk_div = 29493000 / (4800 * 8) - 1;
 588                                         break;
 589                                 case SSP9600:
 590                                         gen_cfg.clk_div = 29493000 / (9600 * 8) - 1;
 591                                         break;
 592                                 case SSP19200:
 593                                         gen_cfg.clk_div = 29493000 / (19200 * 8) - 1;
 594                                         break;
 595                                 case SSP28800:
 596                                         gen_cfg.clk_div = 29493000 / (28800 * 8) - 1;
 597                                         break;
 598                                 case SSP57600:
 599                                         gen_cfg.clk_div = 29493000 / (57600 * 8) - 1;
 600                                         break;
 601                                 case SSP115200:
 602                                         gen_cfg.clk_div = 29493000 / (115200 * 8) - 1;
 603                                         break;
 604                                 case SSP230400:
 605                                         gen_cfg.clk_div = 29493000 / (230400 * 8) - 1;
 606                                         break;
 607                                 case SSP460800:
 608                                         gen_cfg.clk_div = 29493000 / (460800 * 8) - 1;
 609                                         break;
 610                                 case SSP921600:
 611                                         gen_cfg.clk_div = 29493000 / (921600 * 8) - 1;
 612                                         break;
 613                                 case SSP3125000:
 614                                         gen_cfg.base_freq = regk_sser_f100;
 615                                         gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1;
 616                                         break;
 617
 618                         }
 619                 }
 620                 frm_cfg.wordrate = GET_WORD_RATE(arg);
 621
 622                 break;
 623         case SSP_MODE:
 624                 switch(arg)
 625                 {
 626                         case MASTER_OUTPUT:
 627                                 port->output = 1;
 628                                 port->input = 0;
 629                                 gen_cfg.clk_dir = regk_sser_out;
 630                                 break;
 631                         case SLAVE_OUTPUT:
 632                                 port->output = 1;
 633                                 port->input = 0;
 634                                 gen_cfg.clk_dir = regk_sser_in;
 635                                 break;
 636                         case MASTER_INPUT:
 637                                 port->output = 0;
 638                                 port->input = 1;
 639                                 gen_cfg.clk_dir = regk_sser_out;
 640                                 break;
 641                         case SLAVE_INPUT:
 642                                 port->output = 0;
 643                                 port->input = 1;
 644                                 gen_cfg.clk_dir = regk_sser_in;
 645                                 break;
 646                         case MASTER_BIDIR:
 647                                 port->output = 1;
 648                                 port->input = 1;
 649                                 gen_cfg.clk_dir = regk_sser_out;
 650                                 break;
 651                         case SLAVE_BIDIR:
 652                                 port->output = 1;
 653                                 port->input = 1;
 654                                 gen_cfg.clk_dir = regk_sser_in;
 655                                 break;
 656                         default:
 657                                 spin_unlock_irq(&port->lock);
 658                                 return -EINVAL;
 659
 660                 }
 661                 if (!port->use_dma || (arg == MASTER_OUTPUT || arg == SLAVE_OUTPUT))
 662                         intr_mask.rdav = regk_sser_yes;
 663                 break;
 664         case SSP_FRAME_SYNC:
 665                 if (arg & NORMAL_SYNC)
 666                         frm_cfg.tr_delay = 1;
 667                 else if (arg & EARLY_SYNC)
 668                         frm_cfg.tr_delay = 0;
 669
 670                 tr_cfg.bulk_wspace = frm_cfg.tr_delay;
 671                 frm_cfg.early_wend = regk_sser_yes;
 672                 if (arg & BIT_SYNC)
 673                         frm_cfg.type = regk_sser_edge;
 674                 else if (arg & WORD_SYNC)
 675                         frm_cfg.type = regk_sser_level;
 676                 else if (arg & EXTENDED_SYNC)
 677                         frm_cfg.early_wend = regk_sser_no;
 678
 679                 if (arg & SYNC_ON)
 680                         frm_cfg.frame_pin_use = regk_sser_frm;
 681                 else if (arg & SYNC_OFF)
 682                         frm_cfg.frame_pin_use = regk_sser_gio0;
 683
 684                 if (arg & WORD_SIZE_8)
 685                         rec_cfg.sample_size = tr_cfg.sample_size = 7;
 686                 else if (arg & WORD_SIZE_12)
 687                         rec_cfg.sample_size = tr_cfg.sample_size = 11;
 688                 else if (arg & WORD_SIZE_16)
 689                         rec_cfg.sample_size = tr_cfg.sample_size = 15;
 690                 else if (arg & WORD_SIZE_24)
 691                         rec_cfg.sample_size = tr_cfg.sample_size = 23;
 692                 else if (arg & WORD_SIZE_32)
 693                         rec_cfg.sample_size = tr_cfg.sample_size = 31;
 694
 695                 if (arg & BIT_ORDER_MSB)
 696                         rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
 697                 else if (arg & BIT_ORDER_LSB)
 698                         rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst;
 699
 700                 if (arg & FLOW_CONTROL_ENABLE)
 701                         rec_cfg.fifo_thr = regk_sser_thr16;
 702                 else if (arg & FLOW_CONTROL_DISABLE)
 703                         rec_cfg.fifo_thr = regk_sser_inf;
 704
 705                 if (arg & CLOCK_NOT_GATED)
 706                         gen_cfg.gate_clk = regk_sser_no;
 707                 else if (arg & CLOCK_GATED)
 708                         gen_cfg.gate_clk = regk_sser_yes;
 709
 710                 break;
 711         case SSP_IPOLARITY:
 712                 /* NOTE!! negedge is considered NORMAL */
 713                 if (arg & CLOCK_NORMAL)
 714                         rec_cfg.clk_pol = regk_sser_neg;
 715                 else if (arg & CLOCK_INVERT)
 716                         rec_cfg.clk_pol = regk_sser_pos;
 717
 718                 if (arg & FRAME_NORMAL)
 719                         frm_cfg.level = regk_sser_pos_hi;
 720                 else if (arg & FRAME_INVERT)
 721                         frm_cfg.level = regk_sser_neg_lo;
 722
 723                 if (arg & STATUS_NORMAL)
 724                         gen_cfg.hold_pol = regk_sser_pos;
 725                 else if (arg & STATUS_INVERT)
 726                         gen_cfg.hold_pol = regk_sser_neg;
 727                 break;
 728         case SSP_OPOLARITY:
 729                 if (arg & CLOCK_NORMAL)
 730                         gen_cfg.out_clk_pol = regk_sser_neg;
 731                 else if (arg & CLOCK_INVERT)
 732                         gen_cfg.out_clk_pol = regk_sser_pos;
 733
 734                 if (arg & FRAME_NORMAL)
 735                         frm_cfg.level = regk_sser_pos_hi;
 736                 else if (arg & FRAME_INVERT)
 737                         frm_cfg.level = regk_sser_neg_lo;
 738
 739                 if (arg & STATUS_NORMAL)
 740                         gen_cfg.hold_pol = regk_sser_pos;
 741                 else if (arg & STATUS_INVERT)
 742                         gen_cfg.hold_pol = regk_sser_neg;
 743                 break;
 744         case SSP_SPI:
 745                 rec_cfg.fifo_thr = regk_sser_inf;
 746                 rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst;
 747                 rec_cfg.sample_size = tr_cfg.sample_size = 7;
 748                 frm_cfg.frame_pin_use = regk_sser_frm;
 749                 frm_cfg.type = regk_sser_level;
 750                 frm_cfg.tr_delay = 1;
 751                 frm_cfg.level = regk_sser_neg_lo;
 752                 if (arg & SPI_SLAVE)
 753                 {
 754                         rec_cfg.clk_pol = regk_sser_neg;
 755                         gen_cfg.clk_dir = regk_sser_in;
 756                         port->input = 1;
 757                         port->output = 0;
 758                 }
 759                 else
 760                 {
 761                         gen_cfg.out_clk_pol = regk_sser_pos;
 762                         port->input = 0;
 763                         port->output = 1;
 764                         gen_cfg.clk_dir = regk_sser_out;
 765                 }
 766                 break;
 767         case SSP_INBUFCHUNK:
 768                 break;
 769         default:
 770                 return_val = -1;
 771         }
 772
 773
 774         if (port->started)
 775         {
 776                 tr_cfg.tr_en = port->output;
 777                 rec_cfg.rec_en = port->input;
 778         }
 779
 780         REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
 781         REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 782         REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg);
 783         REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
 784         REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg);
 785
 786         spin_unlock_irq(&port->lock);
 787         return return_val;
 788 }
 789
 790 static ssize_t sync_serial_write(struct file * file, const char * buf,
 791                                  size_t count, loff_t *ppos)
 792 {
 793         int dev = MINOR(file->f_dentry->d_inode->i_rdev);
 794         DECLARE_WAITQUEUE(wait, current);
 795         sync_port *port;
 796         unsigned long c, c1;
 797         unsigned long free_outp;
 798         unsigned long outp;
 799         unsigned long out_buffer;
 800         unsigned long flags;
 801
 802         if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
 803         {
 804                 DEBUG(printk("Invalid minor %d\n", dev));
 805                 return -ENODEV;
 806         }
 807         port = &ports[dev];
 808
 809         DEBUGWRITE(printk("W d%d c %lu (%d/%d)\n", port->port_nbr, count, port->out_count, OUT_BUFFER_SIZE));
 810         /* Space to end of buffer */
 811         /*
 812          * out_buffer <c1>012345<-   c    ->OUT_BUFFER_SIZE
 813          *            outp^    +out_count
 814                                 ^free_outp
 815          * out_buffer 45<-     c      ->0123OUT_BUFFER_SIZE
 816          *             +out_count   outp^
 817          *              free_outp
 818          *
 819          */
 820
 821         /* Read variables that may be updated by interrupts */
 822         spin_lock_irqsave(&port->lock, flags);
 823         count = count > OUT_BUFFER_SIZE - port->out_count ? OUT_BUFFER_SIZE  - port->out_count : count;
 824         outp = (unsigned long)port->outp;
 825         free_outp = outp + port->out_count;
 826         spin_unlock_irqrestore(&port->lock, flags);
 827         out_buffer = (unsigned long)port->out_buffer;
 828
 829         /* Find out where and how much to write */
 830         if (free_outp >= out_buffer + OUT_BUFFER_SIZE)
 831                 free_outp -= OUT_BUFFER_SIZE;
 832         if (free_outp >= outp)
 833                 c = out_buffer + OUT_BUFFER_SIZE - free_outp;
 834         else
 835                 c = outp - free_outp;
 836         if (c > count)
 837                 c = count;
 838
 839 //      DEBUGWRITE(printk("w op %08lX fop %08lX c %lu\n", outp, free_outp, c));
 840         if (copy_from_user((void*)free_outp, buf, c))
 841                 return -EFAULT;
 842
 843         if (c != count) {
 844                 buf += c;
 845                 c1 = count - c;
 846                 DEBUGWRITE(printk("w2 fi %lu c %lu c1 %lu\n", free_outp-out_buffer, c, c1));
 847                 if (copy_from_user((void*)out_buffer, buf, c1))
 848                         return -EFAULT;
 849         }
 850         spin_lock_irqsave(&port->lock, flags);
 851         port->out_count += count;
 852         spin_unlock_irqrestore(&port->lock, flags);
 853
 854         /* Make sure transmitter/receiver is running */
 855         if (!port->started)
 856         {
 857                 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
 858                 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
 859                 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
 860                 cfg.en = regk_sser_yes;
 861                 tr_cfg.tr_en = port->output;
 862                 rec_cfg.rec_en = port->input;
 863                 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
 864                 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
 865                 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 866                 port->started = 1;
 867         }
 868
 869         if (file->f_flags & O_NONBLOCK) {
 870                 spin_lock_irqsave(&port->lock, flags);
 871                 if (!port->tr_running) {
 872                         if (!port->use_dma) {
 873                                 reg_sser_rw_intr_mask intr_mask;
 874                                 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
 875                                 /* Start sender by writing data */
 876                                 send_word(port);
 877                                 /* and enable transmitter ready IRQ */
 878                                 intr_mask.trdy = 1;
 879                                 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
 880                         } else {
 881                                 start_dma(port, (unsigned char* volatile )port->outp, c);
 882                         }
 883                 }
 884                 spin_unlock_irqrestore(&port->lock, flags);
 885                 DEBUGWRITE(printk("w d%d c %lu NB\n",
 886                                   port->port_nbr, count));
 887                 return count;
 888         }
 889
 890         /* Sleep until all sent */
 891
 892         add_wait_queue(&port->out_wait_q, &wait);
 893         set_current_state(TASK_INTERRUPTIBLE);
 894         spin_lock_irqsave(&port->lock, flags);
 895         if (!port->tr_running) {
 896                 if (!port->use_dma) {
 897                         reg_sser_rw_intr_mask intr_mask;
 898                         intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
 899                         /* Start sender by writing data */
 900                         send_word(port);
 901                         /* and enable transmitter ready IRQ */
 902                         intr_mask.trdy = 1;
 903                         REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
 904                 } else {
 905                         start_dma(port, port->outp, c);
 906                 }
 907         }
 908         spin_unlock_irqrestore(&port->lock, flags);
 909         schedule();
 910         set_current_state(TASK_RUNNING);
 911         remove_wait_queue(&port->out_wait_q, &wait);
 912         if (signal_pending(current))
 913         {
 914                 return -EINTR;
 915         }
 916         DEBUGWRITE(printk("w d%d c %lu\n", port->port_nbr, count));
 917         return count;
 918 }
 919
 920 static ssize_t sync_serial_read(struct file * file, char * buf,
 921                                 size_t count, loff_t *ppos)
 922 {
 923         int dev = MINOR(file->f_dentry->d_inode->i_rdev);
 924         int avail;
 925         sync_port *port;
 926         unsigned char* start;
 927         unsigned char* end;
 928         unsigned long flags;
 929
 930         if (dev < 0 || dev >= NUMBER_OF_PORTS || !ports[dev].enabled)
 931         {
 932                 DEBUG(printk("Invalid minor %d\n", dev));
 933                 return -ENODEV;
 934         }
 935         port = &ports[dev];
 936
 937         DEBUGREAD(printk("R%d c %d ri %lu wi %lu /%lu\n", dev, count, port->readp - port->flip, port->writep - port->flip, port->in_buffer_size));
 938
 939         if (!port->started)
 940         {
 941                 reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg);
 942                 reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
 943                 reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
 944                 cfg.en = regk_sser_yes;
 945                 tr_cfg.tr_en = regk_sser_yes;
 946                 rec_cfg.rec_en = regk_sser_yes;
 947                 REG_WR(sser, port->regi_sser, rw_cfg, cfg);
 948                 REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg);
 949                 REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg);
 950                 port->started = 1;
 951         }
 952
 953
 954         /* Calculate number of available bytes */
 955         /* Save pointers to avoid that they are modified by interrupt */
 956         spin_lock_irqsave(&port->lock, flags);
 957         start = (unsigned char*)port->readp; /* cast away volatile */
 958         end = (unsigned char*)port->writep;  /* cast away volatile */
 959         spin_unlock_irqrestore(&port->lock, flags);
 960         while ((start == end) && !port->full) /* No data */
 961         {
 962                 if (file->f_flags & O_NONBLOCK)
 963                 {
 964                         return -EAGAIN;
 965                 }
 966
 967                 interruptible_sleep_on(&port->in_wait_q);
 968                 if (signal_pending(current))
 969                 {
 970                         return -EINTR;
 971                 }
 972                 spin_lock_irqsave(&port->lock, flags);
 973                 start = (unsigned char*)port->readp; /* cast away volatile */
 974                 end = (unsigned char*)port->writep;  /* cast away volatile */
 975                 spin_unlock_irqrestore(&port->lock, flags);
 976         }
 977
 978         /* Lazy read, never return wrapped data. */
 979         if (port->full)
 980                 avail = port->in_buffer_size;
 981         else if (end > start)
 982                 avail = end - start;
 983         else
 984                 avail = port->flip + port->in_buffer_size - start;
 985
 986         count = count > avail ? avail : count;
 987         if (copy_to_user(buf, start, count))
 988                 return -EFAULT;
 989         /* Disable interrupts while updating readp */
 990         spin_lock_irqsave(&port->lock, flags);
 991         port->readp += count;
 992         if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
 993                 port->readp = port->flip;
 994         port->full = 0;
 995         spin_unlock_irqrestore(&port->lock, flags);
 996         DEBUGREAD(printk("r %d\n", count));
 997         return count;
 998 }
 999
1000 static void send_word(sync_port* port)
1001 {
1002         reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg);
1003         reg_sser_rw_tr_data tr_data =  {0};
1004
1005         switch(tr_cfg.sample_size)
1006         {
1007          case 8:
1008                  port->out_count--;
1009                  tr_data.data = *port->outp++;
1010                  REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1011                  if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1012                          port->outp = port->out_buffer;
1013                  break;
1014          case 12:
1015          {
1016                 int data = (*port->outp++) << 8;
1017                 data |= *port->outp++;
1018                 port->out_count-=2;
1019                 tr_data.data = data;
1020                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1021                 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1022                         port->outp = port->out_buffer;
1023         }
1024         break;
1025         case 16:
1026                 port->out_count-=2;
1027                 tr_data.data = *(unsigned short *)port->outp;
1028                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1029                 port->outp+=2;
1030                 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1031                         port->outp = port->out_buffer;
1032                 break;
1033         case 24:
1034                 port->out_count-=3;
1035                 tr_data.data = *(unsigned short *)port->outp;
1036                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1037                 port->outp+=2;
1038                 tr_data.data = *port->outp++;
1039                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1040                 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1041                         port->outp = port->out_buffer;
1042                 break;
1043         case 32:
1044                 port->out_count-=4;
1045                 tr_data.data = *(unsigned short *)port->outp;
1046                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1047                 port->outp+=2;
1048                 tr_data.data = *(unsigned short *)port->outp;
1049                 REG_WR(sser, port->regi_sser, rw_tr_data, tr_data);
1050                 port->outp+=2;
1051                 if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1052                         port->outp = port->out_buffer;
1053                 break;
1054         }
1055 }
1056
1057
1058 static void start_dma(struct sync_port* port, const char* data, int count)
1059 {
1060         port->tr_running = 1;
1061         port->out_descr.buf = (char*)virt_to_phys((char*)data);
1062         port->out_descr.after = port->out_descr.buf + count;
1063         port->out_descr.eol = port->out_descr.intr = 1;
1064
1065         port->out_context.saved_data = (dma_descr_data*)virt_to_phys(&port->out_descr);
1066         port->out_context.saved_data_buf = port->out_descr.buf;
1067
1068         DMA_START_CONTEXT(port->regi_dmaout, virt_to_phys((char*)&port->out_context));
1069         DEBUGTXINT(printk("dma %08lX c %d\n", (unsigned long)data, count));
1070 }
1071
1072 static void start_dma_in(sync_port* port)
1073 {
1074         int i;
1075         char* buf;
1076         port->writep = port->flip;
1077
1078         if (port->writep > port->flip + port->in_buffer_size)
1079         {
1080                 panic("Offset too large in sync serial driver\n");
1081                 return;
1082         }
1083         buf = (char*)virt_to_phys(port->in_buffer);
1084         for (i = 0; i < NUM_IN_DESCR; i++) {
1085                 port->in_descr[i].buf = buf;
1086                 port->in_descr[i].after = buf + port->inbufchunk;
1087                 port->in_descr[i].intr = 1;
1088                 port->in_descr[i].next = (dma_descr_data*)virt_to_phys(&port->in_descr[i+1]);
1089                 port->in_descr[i].buf = buf;
1090                 buf += port->inbufchunk;
1091         }
1092         /* Link the last descriptor to the first */
1093         port->in_descr[i-1].next = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1094         port->in_descr[i-1].eol = regk_sser_yes;
1095         port->next_rx_desc = &port->in_descr[0];
1096         port->prev_rx_desc = &port->in_descr[NUM_IN_DESCR - 1];
1097         port->in_context.saved_data = (dma_descr_data*)virt_to_phys(&port->in_descr[0]);
1098         port->in_context.saved_data_buf = port->in_descr[0].buf;
1099         DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context));
1100 }
1101
1102 #ifdef SYNC_SER_DMA
1103 static irqreturn_t tr_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1104 {
1105         reg_dma_r_masked_intr masked;
1106         reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1107         int i;
1108         struct dma_descr_data *descr;
1109         unsigned int sentl;
1110         int found = 0;
1111
1112         for (i = 0; i < NUMBER_OF_PORTS; i++)
1113         {
1114                 sync_port *port = &ports[i];
1115                 if (!port->enabled  || !port->use_dma )
1116                         continue;
1117
1118                 masked = REG_RD(dma, port->regi_dmaout, r_masked_intr);
1119
1120                 if (masked.data) /* IRQ active for the port? */
1121                 {
1122                         found = 1;
1123                         /* Clear IRQ */
1124                         REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr);
1125                         descr = &port->out_descr;
1126                         sentl = descr->after - descr->buf;
1127                         port->out_count -= sentl;
1128                         port->outp += sentl;
1129                         if (port->outp >= port->out_buffer + OUT_BUFFER_SIZE)
1130                                 port->outp = port->out_buffer;
1131                         if (port->out_count)  {
1132                                 int c;
1133                                 c = port->out_buffer + OUT_BUFFER_SIZE - port->outp;
1134                                 if (c > port->out_count)
1135                                         c = port->out_count;
1136                                 DEBUGTXINT(printk("tx_int DMAWRITE %i %i\n", sentl, c));
1137                                 start_dma(port, port->outp, c);
1138                         } else  {
1139                                 DEBUGTXINT(printk("tx_int DMA stop %i\n", sentl));
1140                                 port->tr_running = 0;
1141                         }
1142                         wake_up_interruptible(&port->out_wait_q); /* wake up the waiting process */
1143                 }
1144         }
1145         return IRQ_RETVAL(found);
1146 } /* tr_interrupt */
1147
1148 static irqreturn_t rx_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1149 {
1150         reg_dma_r_masked_intr masked;
1151         reg_dma_rw_ack_intr ack_intr = {.data = regk_dma_yes};
1152
1153         int i;
1154         int found = 0;
1155
1156         for (i = 0; i < NUMBER_OF_PORTS; i++)
1157         {
1158                 sync_port *port = &ports[i];
1159
1160                 if (!port->enabled || !port->use_dma )
1161                         continue;
1162
1163                 masked = REG_RD(dma, port->regi_dmain, r_masked_intr);
1164
1165                 if (masked.data) /* Descriptor interrupt */
1166                 {
1167                         found = 1;
1168                         while (REG_RD(dma, port->regi_dmain, rw_data) !=
1169                                virt_to_phys(port->next_rx_desc)) {
1170
1171                                 if (port->writep + port->inbufchunk > port->flip + port->in_buffer_size) {
1172                                         int first_size = port->flip + port->in_buffer_size - port->writep;
1173                                         memcpy((char*)port->writep, phys_to_virt((unsigned)port->next_rx_desc->buf), first_size);
1174                                         memcpy(port->flip, phys_to_virt((unsigned)port->next_rx_desc->buf+first_size), port->inbufchunk - first_size);
1175                                         port->writep = port->flip + port->inbufchunk - first_size;
1176                                 } else {
1177                                         memcpy((char*)port->writep,
1178                                                phys_to_virt((unsigned)port->next_rx_desc->buf),
1179                                                port->inbufchunk);
1180                                         port->writep += port->inbufchunk;
1181                                         if (port->writep >= port->flip + port->in_buffer_size)
1182                                                 port->writep = port->flip;
1183                                 }
1184                                 if (port->writep == port->readp)
1185                                 {
1186                                   port->full = 1;
1187                                 }
1188
1189                                 port->next_rx_desc->eol = 0;
1190                                 port->prev_rx_desc->eol = 1;
1191                                 port->prev_rx_desc = phys_to_virt((unsigned)port->next_rx_desc);
1192                                 port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next);
1193                                 wake_up_interruptible(&port->in_wait_q); /* wake up the waiting process */
1194                                 DMA_CONTINUE(port->regi_dmain);
1195                                 REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr);
1196
1197                         }
1198                 }
1199         }
1200         return IRQ_RETVAL(found);
1201 } /* rx_interrupt */
1202 #endif /* SYNC_SER_DMA */
1203
1204 #ifdef SYNC_SER_MANUAL
1205 static irqreturn_t manual_interrupt(int irq, void *dev_id, struct pt_regs * regs)
1206 {
1207         int i;
1208         int found = 0;
1209         reg_sser_r_masked_intr masked;
1210
1211         for (i = 0; i < NUMBER_OF_PORTS; i++)
1212         {
1213                 sync_port* port = &ports[i];
1214
1215                 if (!port->enabled || port->use_dma)
1216                 {
1217                         continue;
1218                 }
1219
1220                 masked = REG_RD(sser, port->regi_sser, r_masked_intr);
1221                 if (masked.rdav)        /* Data received? */
1222                 {
1223                         reg_sser_rw_rec_cfg rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg);
1224                         reg_sser_r_rec_data data = REG_RD(sser, port->regi_sser, r_rec_data);
1225                         found = 1;
1226                         /* Read data */
1227                         switch(rec_cfg.sample_size)
1228                         {
1229                         case 8:
1230                                 *port->writep++ = data.data & 0xff;
1231                                 break;
1232                         case 12:
1233                                 *port->writep = (data.data & 0x0ff0) >> 4;
1234                                 *(port->writep + 1) = data.data & 0x0f;
1235                                 port->writep+=2;
1236                                 break;
1237                         case 16:
1238                                 *(unsigned short*)port->writep = data.data;
1239                                 port->writep+=2;
1240                                 break;
1241                         case 24:
1242                                 *(unsigned int*)port->writep = data.data;
1243                                 port->writep+=3;
1244                                 break;
1245                         case 32:
1246                                 *(unsigned int*)port->writep = data.data;
1247                                 port->writep+=4;
1248                                 break;
1249                         }
1250
1251                         if (port->writep >= port->flip + port->in_buffer_size) /* Wrap? */
1252                                 port->writep = port->flip;
1253                         if (port->writep == port->readp) {
1254                                 /* receive buffer overrun, discard oldest data
1255                                  */
1256                                 port->readp++;
1257                                 if (port->readp >= port->flip + port->in_buffer_size) /* Wrap? */
1258                                         port->readp = port->flip;
1259                         }
1260                         if (sync_data_avail(port) >= port->inbufchunk)
1261                                 wake_up_interruptible(&port->in_wait_q); /* Wake up application */
1262                 }
1263
1264                 if (masked.trdy) /* Transmitter ready? */
1265                 {
1266                         found = 1;
1267                         if (port->out_count > 0) /* More data to send */
1268                                 send_word(port);
1269                         else /* transmission finished */
1270                         {
1271                                 reg_sser_rw_intr_mask intr_mask;
1272                                 intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask);
1273                                 intr_mask.trdy = 0;
1274                                 REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask);
1275                                 wake_up_interruptible(&port->out_wait_q); /* Wake up application */
1276                         }
1277                 }
1278         }
1279         return IRQ_RETVAL(found);
1280 }
1281 #endif
1282
1283 module_init(etrax_sync_serial_init);