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   1 /*
   2  * File:         drivers/serial/bfin_5xx.c
   3  * Based on:     Based on drivers/serial/sa1100.c
   4  * Author:       Aubrey Li <aubrey.li@analog.com>
   5  *
   6  * Created:
   7  * Description:  Driver for blackfin 5xx serial ports
   8  *
   9  * Modified:
  10  *               Copyright 2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  31 #define SUPPORT_SYSRQ
  32 #endif
  33
  34 #include <linux/module.h>
  35 #include <linux/ioport.h>
  36 #include <linux/init.h>
  37 #include <linux/console.h>
  38 #include <linux/sysrq.h>
  39 #include <linux/platform_device.h>
  40 #include <linux/tty.h>
  41 #include <linux/tty_flip.h>
  42 #include <linux/serial_core.h>
  43
  44 #include <asm/gpio.h>
  45 #include <asm/mach/bfin_serial_5xx.h>
  46
  47 #ifdef CONFIG_SERIAL_BFIN_DMA
  48 #include <linux/dma-mapping.h>
  49 #include <asm/io.h>
  50 #include <asm/irq.h>
  51 #include <asm/cacheflush.h>
  52 #endif
  53
  54 /* UART name and device definitions */
  55 #define BFIN_SERIAL_NAME        "ttyBF"
  56 #define BFIN_SERIAL_MAJOR       204
  57 #define BFIN_SERIAL_MINOR       64
  58
  59 /*
  60  * Setup for console. Argument comes from the menuconfig
  61  */
  62 #define DMA_RX_XCOUNT           512
  63 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  64
  65 #define DMA_RX_FLUSH_JIFFIES    5
  66
  67 #ifdef CONFIG_SERIAL_BFIN_DMA
  68 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  69 #else
  70 static void bfin_serial_do_work(struct work_struct *work);
  71 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  72 static void local_put_char(struct bfin_serial_port *uart, char ch);
  73 #endif
  74
  75 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  76
  77 /*
  78  * interrupts are disabled on entry
  79  */
  80 static void bfin_serial_stop_tx(struct uart_port *port)
  81 {
  82         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  83
  84 #ifdef CONFIG_SERIAL_BFIN_DMA
  85         disable_dma(uart->tx_dma_channel);
  86 #else
  87         unsigned short ier;
  88
  89         ier = UART_GET_IER(uart);
  90         ier &= ~ETBEI;
  91         UART_PUT_IER(uart, ier);
  92 #endif
  93 }
  94
  95 /*
  96  * port is locked and interrupts are disabled
  97  */
  98 static void bfin_serial_start_tx(struct uart_port *port)
  99 {
 100         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 101
 102 #ifdef CONFIG_SERIAL_BFIN_DMA
 103         bfin_serial_dma_tx_chars(uart);
 104 #else
 105         unsigned short ier;
 106         ier = UART_GET_IER(uart);
 107         ier |= ETBEI;
 108         UART_PUT_IER(uart, ier);
 109         bfin_serial_tx_chars(uart);
 110 #endif
 111 }
 112
 113 /*
 114  * Interrupts are enabled
 115  */
 116 static void bfin_serial_stop_rx(struct uart_port *port)
 117 {
 118         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 119         unsigned short ier;
 120
 121         ier = UART_GET_IER(uart);
 122         ier &= ~ERBFI;
 123         UART_PUT_IER(uart, ier);
 124 }
 125
 126 /*
 127  * Set the modem control timer to fire immediately.
 128  */
 129 static void bfin_serial_enable_ms(struct uart_port *port)
 130 {
 131 }
 132
 133 #ifdef CONFIG_SERIAL_BFIN_PIO
 134 static void local_put_char(struct bfin_serial_port *uart, char ch)
 135 {
 136         unsigned short status;
 137         int flags = 0;
 138
 139         spin_lock_irqsave(&uart->port.lock, flags);
 140
 141         do {
 142                 status = UART_GET_LSR(uart);
 143         } while (!(status & THRE));
 144
 145         UART_PUT_CHAR(uart, ch);
 146         SSYNC();
 147
 148         spin_unlock_irqrestore(&uart->port.lock, flags);
 149 }
 150
 151 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 152 {
 153         struct tty_struct *tty = uart->port.info->tty;
 154         unsigned int status, ch, flg;
 155 #ifdef BF533_FAMILY
 156         static int in_break = 0;
 157 #endif
 158
 159         status = UART_GET_LSR(uart);
 160         ch = UART_GET_CHAR(uart);
 161         uart->port.icount.rx++;
 162
 163 #ifdef BF533_FAMILY
 164         /* The BF533 family of processors have a nice misbehavior where
 165          * they continuously generate characters for a "single" break.
 166          * We have to basically ignore this flood until the "next" valid
 167          * character comes across.  All other Blackfin families operate
 168          * properly though.
 169          */
 170         if (in_break) {
 171                 if (ch != 0) {
 172                         in_break = 0;
 173                         ch = UART_GET_CHAR(uart);
 174                         if (bfin_revid() < 5)
 175                                 return;
 176                 } else
 177                         return;
 178         }
 179 #endif
 180
 181         if (status & BI) {
 182 #ifdef BF533_FAMILY
 183                 in_break = 1;
 184 #endif
 185                 uart->port.icount.brk++;
 186                 if (uart_handle_break(&uart->port))
 187                         goto ignore_char;
 188                 status &= ~(PE | FE);
 189         }
 190         if (status & PE)
 191                 uart->port.icount.parity++;
 192         if (status & OE)
 193                 uart->port.icount.overrun++;
 194         if (status & FE)
 195                 uart->port.icount.frame++;
 196
 197         status &= uart->port.read_status_mask;
 198
 199         if (status & BI)
 200                 flg = TTY_BREAK;
 201         else if (status & PE)
 202                 flg = TTY_PARITY;
 203         else if (status & FE)
 204                 flg = TTY_FRAME;
 205         else
 206                 flg = TTY_NORMAL;
 207
 208         if (uart_handle_sysrq_char(&uart->port, ch))
 209                 goto ignore_char;
 210
 211         uart_insert_char(&uart->port, status, OE, ch, flg);
 212
 213  ignore_char:
 214         tty_flip_buffer_push(tty);
 215 }
 216
 217 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 218 {
 219         struct circ_buf *xmit = &uart->port.info->xmit;
 220
 221         if (uart->port.x_char) {
 222                 UART_PUT_CHAR(uart, uart->port.x_char);
 223                 uart->port.icount.tx++;
 224                 uart->port.x_char = 0;
 225                 return;
 226         }
 227         /*
 228          * Check the modem control lines before
 229          * transmitting anything.
 230          */
 231         bfin_serial_mctrl_check(uart);
 232
 233         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 234                 bfin_serial_stop_tx(&uart->port);
 235                 return;
 236         }
 237
 238         local_put_char(uart, xmit->buf[xmit->tail]);
 239         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 240         uart->port.icount.tx++;
 241
 242         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 243                 uart_write_wakeup(&uart->port);
 244
 245         if (uart_circ_empty(xmit))
 246                 bfin_serial_stop_tx(&uart->port);
 247 }
 248
 249 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 250 {
 251         struct bfin_serial_port *uart = dev_id;
 252
 253         spin_lock(&uart->port.lock);
 254         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY)
 255                 bfin_serial_rx_chars(uart);
 256         spin_unlock(&uart->port.lock);
 257         return IRQ_HANDLED;
 258 }
 259
 260 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 261 {
 262         struct bfin_serial_port *uart = dev_id;
 263
 264         spin_lock(&uart->port.lock);
 265         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)
 266                 bfin_serial_tx_chars(uart);
 267         spin_unlock(&uart->port.lock);
 268         return IRQ_HANDLED;
 269 }
 270
 271
 272 static void bfin_serial_do_work(struct work_struct *work)
 273 {
 274         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 275
 276         bfin_serial_mctrl_check(uart);
 277 }
 278
 279 #endif
 280
 281 #ifdef CONFIG_SERIAL_BFIN_DMA
 282 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 283 {
 284         struct circ_buf *xmit = &uart->port.info->xmit;
 285         unsigned short ier;
 286         int flags = 0;
 287
 288         if (!uart->tx_done)
 289                 return;
 290
 291         uart->tx_done = 0;
 292
 293         if (uart->port.x_char) {
 294                 UART_PUT_CHAR(uart, uart->port.x_char);
 295                 uart->port.icount.tx++;
 296                 uart->port.x_char = 0;
 297                 uart->tx_done = 1;
 298                 return;
 299         }
 300         /*
 301          * Check the modem control lines before
 302          * transmitting anything.
 303          */
 304         bfin_serial_mctrl_check(uart);
 305
 306         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 307                 bfin_serial_stop_tx(&uart->port);
 308                 uart->tx_done = 1;
 309                 return;
 310         }
 311
 312         spin_lock_irqsave(&uart->port.lock, flags);
 313         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 314         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 315                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 316         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 317                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 318         set_dma_config(uart->tx_dma_channel,
 319                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 320                         INTR_ON_BUF,
 321                         DIMENSION_LINEAR,
 322                         DATA_SIZE_8));
 323         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 324         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 325         set_dma_x_modify(uart->tx_dma_channel, 1);
 326         enable_dma(uart->tx_dma_channel);
 327         ier = UART_GET_IER(uart);
 328         ier |= ETBEI;
 329         UART_PUT_IER(uart, ier);
 330         spin_unlock_irqrestore(&uart->port.lock, flags);
 331 }
 332
 333 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
 334 {
 335         struct tty_struct *tty = uart->port.info->tty;
 336         int i, flg, status;
 337
 338         status = UART_GET_LSR(uart);
 339         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 340
 341         if (status & BI) {
 342                 uart->port.icount.brk++;
 343                 if (uart_handle_break(&uart->port))
 344                         goto dma_ignore_char;
 345                 status &= ~(PE | FE);
 346         }
 347         if (status & PE)
 348                 uart->port.icount.parity++;
 349         if (status & OE)
 350                 uart->port.icount.overrun++;
 351         if (status & FE)
 352                 uart->port.icount.frame++;
 353
 354         status &= uart->port.read_status_mask;
 355
 356         if (status & BI)
 357                 flg = TTY_BREAK;
 358         else if (status & PE)
 359                 flg = TTY_PARITY;
 360         else if (status & FE)
 361                 flg = TTY_FRAME;
 362         else
 363                 flg = TTY_NORMAL;
 364
 365         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 366                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 367                         goto dma_ignore_char;
 368                 uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);
 369         }
 370
 371  dma_ignore_char:
 372         tty_flip_buffer_push(tty);
 373 }
 374
 375 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 376 {
 377         int x_pos, pos;
 378         int flags = 0;
 379
 380         bfin_serial_dma_tx_chars(uart);
 381
 382         spin_lock_irqsave(&uart->port.lock, flags);
 383         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 384         if (x_pos == DMA_RX_XCOUNT)
 385                 x_pos = 0;
 386
 387         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 388
 389         if (pos>uart->rx_dma_buf.tail) {
 390                 uart->rx_dma_buf.tail = pos;
 391                 bfin_serial_dma_rx_chars(uart);
 392                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 393         }
 394         spin_unlock_irqrestore(&uart->port.lock, flags);
 395         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 396         add_timer(&(uart->rx_dma_timer));
 397 }
 398
 399 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 400 {
 401         struct bfin_serial_port *uart = dev_id;
 402         struct circ_buf *xmit = &uart->port.info->xmit;
 403         unsigned short ier;
 404
 405         spin_lock(&uart->port.lock);
 406         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 407                 clear_dma_irqstat(uart->tx_dma_channel);
 408                 disable_dma(uart->tx_dma_channel);
 409                 ier = UART_GET_IER(uart);
 410                 ier &= ~ETBEI;
 411                 UART_PUT_IER(uart, ier);
 412                 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
 413                 uart->port.icount.tx+=uart->tx_count;
 414
 415                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 416                         uart_write_wakeup(&uart->port);
 417
 418                 if (uart_circ_empty(xmit))
 419                         bfin_serial_stop_tx(&uart->port);
 420                 uart->tx_done = 1;
 421         }
 422
 423         spin_unlock(&uart->port.lock);
 424         return IRQ_HANDLED;
 425 }
 426
 427 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 428 {
 429         struct bfin_serial_port *uart = dev_id;
 430         unsigned short irqstat;
 431
 432         uart->rx_dma_nrows++;
 433         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 434                 uart->rx_dma_nrows = 0;
 435                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 436                 bfin_serial_dma_rx_chars(uart);
 437                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 438         }
 439         spin_lock(&uart->port.lock);
 440         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 441         clear_dma_irqstat(uart->rx_dma_channel);
 442
 443         spin_unlock(&uart->port.lock);
 444         return IRQ_HANDLED;
 445 }
 446 #endif
 447
 448 /*
 449  * Return TIOCSER_TEMT when transmitter is not busy.
 450  */
 451 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 452 {
 453         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 454         unsigned short lsr;
 455
 456         lsr = UART_GET_LSR(uart);
 457         if (lsr & TEMT)
 458                 return TIOCSER_TEMT;
 459         else
 460                 return 0;
 461 }
 462
 463 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 464 {
 465 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 466         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 467         if (uart->cts_pin < 0)
 468                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 469
 470         if (gpio_get_value(uart->cts_pin))
 471                 return TIOCM_DSR | TIOCM_CAR;
 472         else
 473 #endif
 474                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 475 }
 476
 477 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 478 {
 479 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 480         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 481         if (uart->rts_pin < 0)
 482                 return;
 483
 484         if (mctrl & TIOCM_RTS)
 485                 gpio_set_value(uart->rts_pin, 0);
 486         else
 487                 gpio_set_value(uart->rts_pin, 1);
 488 #endif
 489 }
 490
 491 /*
 492  * Handle any change of modem status signal since we were last called.
 493  */
 494 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 495 {
 496 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 497         unsigned int status;
 498 # ifdef CONFIG_SERIAL_BFIN_DMA
 499         struct uart_info *info = uart->port.info;
 500         struct tty_struct *tty = info->tty;
 501
 502         status = bfin_serial_get_mctrl(&uart->port);
 503         if (!(status & TIOCM_CTS)) {
 504                 tty->hw_stopped = 1;
 505         } else {
 506                 tty->hw_stopped = 0;
 507         }
 508 # else
 509         status = bfin_serial_get_mctrl(&uart->port);
 510         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 511         if (!(status & TIOCM_CTS))
 512                 schedule_work(&uart->cts_workqueue);
 513 # endif
 514 #endif
 515 }
 516
 517 /*
 518  * Interrupts are always disabled.
 519  */
 520 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 521 {
 522         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 523         u16 lcr = UART_GET_LCR(uart);
 524         if (break_state)
 525                 lcr |= SB;
 526         else
 527                 lcr &= ~SB;
 528         UART_PUT_LCR(uart, lcr);
 529         SSYNC();
 530 }
 531
 532 static int bfin_serial_startup(struct uart_port *port)
 533 {
 534         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 535
 536 #ifdef CONFIG_SERIAL_BFIN_DMA
 537         dma_addr_t dma_handle;
 538
 539         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 540                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 541                 return -EBUSY;
 542         }
 543
 544         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 545                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 546                 free_dma(uart->rx_dma_channel);
 547                 return -EBUSY;
 548         }
 549
 550         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 551         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 552
 553         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 554         uart->rx_dma_buf.head = 0;
 555         uart->rx_dma_buf.tail = 0;
 556         uart->rx_dma_nrows = 0;
 557
 558         set_dma_config(uart->rx_dma_channel,
 559                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 560                                 INTR_ON_ROW, DIMENSION_2D,
 561                                 DATA_SIZE_8));
 562         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 563         set_dma_x_modify(uart->rx_dma_channel, 1);
 564         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 565         set_dma_y_modify(uart->rx_dma_channel, 1);
 566         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 567         enable_dma(uart->rx_dma_channel);
 568
 569         uart->rx_dma_timer.data = (unsigned long)(uart);
 570         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 571         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 572         add_timer(&(uart->rx_dma_timer));
 573 #else
 574         if (request_irq
 575             (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 576              "BFIN_UART_RX", uart)) {
 577                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 578                 return -EBUSY;
 579         }
 580
 581         if (request_irq
 582             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 583              "BFIN_UART_TX", uart)) {
 584                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 585                 free_irq(uart->port.irq, uart);
 586                 return -EBUSY;
 587         }
 588 #endif
 589         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 590         return 0;
 591 }
 592
 593 static void bfin_serial_shutdown(struct uart_port *port)
 594 {
 595         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 596
 597 #ifdef CONFIG_SERIAL_BFIN_DMA
 598         disable_dma(uart->tx_dma_channel);
 599         free_dma(uart->tx_dma_channel);
 600         disable_dma(uart->rx_dma_channel);
 601         free_dma(uart->rx_dma_channel);
 602         del_timer(&(uart->rx_dma_timer));
 603 #else
 604         free_irq(uart->port.irq, uart);
 605         free_irq(uart->port.irq+1, uart);
 606 #endif
 607 }
 608
 609 static void
 610 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 611                    struct ktermios *old)
 612 {
 613         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 614         unsigned long flags;
 615         unsigned int baud, quot;
 616         unsigned short val, ier, lsr, lcr = 0;
 617
 618         switch (termios->c_cflag & CSIZE) {
 619         case CS8:
 620                 lcr = WLS(8);
 621                 break;
 622         case CS7:
 623                 lcr = WLS(7);
 624                 break;
 625         case CS6:
 626                 lcr = WLS(6);
 627                 break;
 628         case CS5:
 629                 lcr = WLS(5);
 630                 break;
 631         default:
 632                 printk(KERN_ERR "%s: word lengh not supported\n",
 633                         __FUNCTION__);
 634         }
 635
 636         if (termios->c_cflag & CSTOPB)
 637                 lcr |= STB;
 638         if (termios->c_cflag & PARENB)
 639                 lcr |= PEN;
 640         if (!(termios->c_cflag & PARODD))
 641                 lcr |= EPS;
 642         if (termios->c_cflag & CMSPAR)
 643                 lcr |= STP;
 644
 645         port->read_status_mask = OE;
 646         if (termios->c_iflag & INPCK)
 647                 port->read_status_mask |= (FE | PE);
 648         if (termios->c_iflag & (BRKINT | PARMRK))
 649                 port->read_status_mask |= BI;
 650
 651         /*
 652          * Characters to ignore
 653          */
 654         port->ignore_status_mask = 0;
 655         if (termios->c_iflag & IGNPAR)
 656                 port->ignore_status_mask |= FE | PE;
 657         if (termios->c_iflag & IGNBRK) {
 658                 port->ignore_status_mask |= BI;
 659                 /*
 660                  * If we're ignoring parity and break indicators,
 661                  * ignore overruns too (for real raw support).
 662                  */
 663                 if (termios->c_iflag & IGNPAR)
 664                         port->ignore_status_mask |= OE;
 665         }
 666
 667         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 668         quot = uart_get_divisor(port, baud);
 669         spin_lock_irqsave(&uart->port.lock, flags);
 670
 671         do {
 672                 lsr = UART_GET_LSR(uart);
 673         } while (!(lsr & TEMT));
 674
 675         /* Disable UART */
 676         ier = UART_GET_IER(uart);
 677         UART_PUT_IER(uart, 0);
 678
 679         /* Set DLAB in LCR to Access DLL and DLH */
 680         val = UART_GET_LCR(uart);
 681         val |= DLAB;
 682         UART_PUT_LCR(uart, val);
 683         SSYNC();
 684
 685         UART_PUT_DLL(uart, quot & 0xFF);
 686         SSYNC();
 687         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 688         SSYNC();
 689
 690         /* Clear DLAB in LCR to Access THR RBR IER */
 691         val = UART_GET_LCR(uart);
 692         val &= ~DLAB;
 693         UART_PUT_LCR(uart, val);
 694         SSYNC();
 695
 696         UART_PUT_LCR(uart, lcr);
 697
 698         /* Enable UART */
 699         UART_PUT_IER(uart, ier);
 700
 701         val = UART_GET_GCTL(uart);
 702         val |= UCEN;
 703         UART_PUT_GCTL(uart, val);
 704
 705         spin_unlock_irqrestore(&uart->port.lock, flags);
 706 }
 707
 708 static const char *bfin_serial_type(struct uart_port *port)
 709 {
 710         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 711
 712         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 713 }
 714
 715 /*
 716  * Release the memory region(s) being used by 'port'.
 717  */
 718 static void bfin_serial_release_port(struct uart_port *port)
 719 {
 720 }
 721
 722 /*
 723  * Request the memory region(s) being used by 'port'.
 724  */
 725 static int bfin_serial_request_port(struct uart_port *port)
 726 {
 727         return 0;
 728 }
 729
 730 /*
 731  * Configure/autoconfigure the port.
 732  */
 733 static void bfin_serial_config_port(struct uart_port *port, int flags)
 734 {
 735         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 736
 737         if (flags & UART_CONFIG_TYPE &&
 738             bfin_serial_request_port(&uart->port) == 0)
 739                 uart->port.type = PORT_BFIN;
 740 }
 741
 742 /*
 743  * Verify the new serial_struct (for TIOCSSERIAL).
 744  * The only change we allow are to the flags and type, and
 745  * even then only between PORT_BFIN and PORT_UNKNOWN
 746  */
 747 static int
 748 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 749 {
 750         return 0;
 751 }
 752
 753 static struct uart_ops bfin_serial_pops = {
 754         .tx_empty       = bfin_serial_tx_empty,
 755         .set_mctrl      = bfin_serial_set_mctrl,
 756         .get_mctrl      = bfin_serial_get_mctrl,
 757         .stop_tx        = bfin_serial_stop_tx,
 758         .start_tx       = bfin_serial_start_tx,
 759         .stop_rx        = bfin_serial_stop_rx,
 760         .enable_ms      = bfin_serial_enable_ms,
 761         .break_ctl      = bfin_serial_break_ctl,
 762         .startup        = bfin_serial_startup,
 763         .shutdown       = bfin_serial_shutdown,
 764         .set_termios    = bfin_serial_set_termios,
 765         .type           = bfin_serial_type,
 766         .release_port   = bfin_serial_release_port,
 767         .request_port   = bfin_serial_request_port,
 768         .config_port    = bfin_serial_config_port,
 769         .verify_port    = bfin_serial_verify_port,
 770 };
 771
 772 static void __init bfin_serial_init_ports(void)
 773 {
 774         static int first = 1;
 775         int i;
 776
 777         if (!first)
 778                 return;
 779         first = 0;
 780
 781         for (i = 0; i < nr_ports; i++) {
 782                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 783                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 784                 bfin_serial_ports[i].port.line      = i;
 785                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 786                 bfin_serial_ports[i].port.membase   =
 787                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 788                 bfin_serial_ports[i].port.mapbase   =
 789                         bfin_serial_resource[i].uart_base_addr;
 790                 bfin_serial_ports[i].port.irq       =
 791                         bfin_serial_resource[i].uart_irq;
 792                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 793 #ifdef CONFIG_SERIAL_BFIN_DMA
 794                 bfin_serial_ports[i].tx_done        = 1;
 795                 bfin_serial_ports[i].tx_count       = 0;
 796                 bfin_serial_ports[i].tx_dma_channel =
 797                         bfin_serial_resource[i].uart_tx_dma_channel;
 798                 bfin_serial_ports[i].rx_dma_channel =
 799                         bfin_serial_resource[i].uart_rx_dma_channel;
 800                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 801 #else
 802                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 803 #endif
 804 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 805                 bfin_serial_ports[i].cts_pin        =
 806                         bfin_serial_resource[i].uart_cts_pin;
 807                 bfin_serial_ports[i].rts_pin        =
 808                         bfin_serial_resource[i].uart_rts_pin;
 809 #endif
 810                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 811
 812         }
 813 }
 814
 815 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 816 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
 817 {
 818         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 819         while (!(UART_GET_LSR(uart)))
 820                 barrier();
 821         UART_PUT_CHAR(uart, ch);
 822         SSYNC();
 823 }
 824
 825 /*
 826  * Interrupts are disabled on entering
 827  */
 828 static void
 829 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
 830 {
 831         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
 832         int flags = 0;
 833
 834         spin_lock_irqsave(&uart->port.lock, flags);
 835         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
 836         spin_unlock_irqrestore(&uart->port.lock, flags);
 837
 838 }
 839
 840 /*
 841  * If the port was already initialised (eg, by a boot loader),
 842  * try to determine the current setup.
 843  */
 844 static void __init
 845 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 846                            int *parity, int *bits)
 847 {
 848         unsigned short status;
 849
 850         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 851         if (status == (ERBFI | ETBEI)) {
 852                 /* ok, the port was enabled */
 853                 unsigned short lcr, val;
 854                 unsigned short dlh, dll;
 855
 856                 lcr = UART_GET_LCR(uart);
 857
 858                 *parity = 'n';
 859                 if (lcr & PEN) {
 860                         if (lcr & EPS)
 861                                 *parity = 'e';
 862                         else
 863                                 *parity = 'o';
 864                 }
 865                 switch (lcr & 0x03) {
 866                         case 0: *bits = 5; break;
 867                         case 1: *bits = 6; break;
 868                         case 2: *bits = 7; break;
 869                         case 3: *bits = 8; break;
 870                 }
 871                 /* Set DLAB in LCR to Access DLL and DLH */
 872                 val = UART_GET_LCR(uart);
 873                 val |= DLAB;
 874                 UART_PUT_LCR(uart, val);
 875
 876                 dll = UART_GET_DLL(uart);
 877                 dlh = UART_GET_DLH(uart);
 878
 879                 /* Clear DLAB in LCR to Access THR RBR IER */
 880                 val = UART_GET_LCR(uart);
 881                 val &= ~DLAB;
 882                 UART_PUT_LCR(uart, val);
 883
 884                 *baud = get_sclk() / (16*(dll | dlh << 8));
 885         }
 886         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
 887 }
 888
 889 static int __init
 890 bfin_serial_console_setup(struct console *co, char *options)
 891 {
 892         struct bfin_serial_port *uart;
 893         int baud = 57600;
 894         int bits = 8;
 895         int parity = 'n';
 896 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 897         int flow = 'r';
 898 #else
 899         int flow = 'n';
 900 #endif
 901
 902         /*
 903          * Check whether an invalid uart number has been specified, and
 904          * if so, search for the first available port that does have
 905          * console support.
 906          */
 907         if (co->index == -1 || co->index >= nr_ports)
 908                 co->index = 0;
 909         uart = &bfin_serial_ports[co->index];
 910
 911         if (options)
 912                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 913         else
 914                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
 915
 916         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
 917 }
 918
 919 static struct uart_driver bfin_serial_reg;
 920 static struct console bfin_serial_console = {
 921         .name           = BFIN_SERIAL_NAME,
 922         .write          = bfin_serial_console_write,
 923         .device         = uart_console_device,
 924         .setup          = bfin_serial_console_setup,
 925         .flags          = CON_PRINTBUFFER,
 926         .index          = -1,
 927         .data           = &bfin_serial_reg,
 928 };
 929
 930 static int __init bfin_serial_rs_console_init(void)
 931 {
 932         bfin_serial_init_ports();
 933         register_console(&bfin_serial_console);
 934         return 0;
 935 }
 936 console_initcall(bfin_serial_rs_console_init);
 937
 938 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
 939 #else
 940 #define BFIN_SERIAL_CONSOLE     NULL
 941 #endif
 942
 943 static struct uart_driver bfin_serial_reg = {
 944         .owner                  = THIS_MODULE,
 945         .driver_name            = "bfin-uart",
 946         .dev_name               = BFIN_SERIAL_NAME,
 947         .major                  = BFIN_SERIAL_MAJOR,
 948         .minor                  = BFIN_SERIAL_MINOR,
 949         .nr                     = NR_PORTS,
 950         .cons                   = BFIN_SERIAL_CONSOLE,
 951 };
 952
 953 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
 954 {
 955         struct bfin_serial_port *uart = platform_get_drvdata(dev);
 956
 957         if (uart)
 958                 uart_suspend_port(&bfin_serial_reg, &uart->port);
 959
 960         return 0;
 961 }
 962
 963 static int bfin_serial_resume(struct platform_device *dev)
 964 {
 965         struct bfin_serial_port *uart = platform_get_drvdata(dev);
 966
 967         if (uart)
 968                 uart_resume_port(&bfin_serial_reg, &uart->port);
 969
 970         return 0;
 971 }
 972
 973 static int bfin_serial_probe(struct platform_device *dev)
 974 {
 975         struct resource *res = dev->resource;
 976         int i;
 977
 978         for (i = 0; i < dev->num_resources; i++, res++)
 979                 if (res->flags & IORESOURCE_MEM)
 980                         break;
 981
 982         if (i < dev->num_resources) {
 983                 for (i = 0; i < nr_ports; i++, res++) {
 984                         if (bfin_serial_ports[i].port.mapbase != res->start)
 985                                 continue;
 986                         bfin_serial_ports[i].port.dev = &dev->dev;
 987                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
 988                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
 989                 }
 990         }
 991
 992         return 0;
 993 }
 994
 995 static int bfin_serial_remove(struct platform_device *pdev)
 996 {
 997         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
 998
 999
1000 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1001         gpio_free(uart->cts_pin);
1002         gpio_free(uart->rts_pin);
1003 #endif
1004
1005         platform_set_drvdata(pdev, NULL);
1006
1007         if (uart)
1008                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1009
1010         return 0;
1011 }
1012
1013 static struct platform_driver bfin_serial_driver = {
1014         .probe          = bfin_serial_probe,
1015         .remove         = bfin_serial_remove,
1016         .suspend        = bfin_serial_suspend,
1017         .resume         = bfin_serial_resume,
1018         .driver         = {
1019                 .name   = "bfin-uart",
1020         },
1021 };
1022
1023 static int __init bfin_serial_init(void)
1024 {
1025         int ret;
1026
1027         pr_info("Serial: Blackfin serial driver\n");
1028
1029         bfin_serial_init_ports();
1030
1031         ret = uart_register_driver(&bfin_serial_reg);
1032         if (ret == 0) {
1033                 ret = platform_driver_register(&bfin_serial_driver);
1034                 if (ret) {
1035                         pr_debug("uart register failed\n");
1036                         uart_unregister_driver(&bfin_serial_reg);
1037                 }
1038         }
1039         return ret;
1040 }
1041
1042 static void __exit bfin_serial_exit(void)
1043 {
1044         platform_driver_unregister(&bfin_serial_driver);
1045         uart_unregister_driver(&bfin_serial_reg);
1046 }
1047
1048 module_init(bfin_serial_init);
1049 module_exit(bfin_serial_exit);
1050
1051 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1052 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1053 MODULE_LICENSE("GPL");
1054 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);