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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  * Rev:          $Id: bfin_5xx.c,v 1.19 2006/09/24 02:33:53 aubrey Exp $
  10  *
  11  * Modified:
  12  *               Copyright 2006 Analog Devices Inc.
  13  *
  14  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, see the file COPYING, or write
  28  * to the Free Software Foundation, Inc.,
  29  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  30  */
  31
  32 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  33 #define SUPPORT_SYSRQ
  34 #endif
  35
  36 #include <linux/module.h>
  37 #include <linux/ioport.h>
  38 #include <linux/init.h>
  39 #include <linux/console.h>
  40 #include <linux/sysrq.h>
  41 #include <linux/platform_device.h>
  42 #include <linux/tty.h>
  43 #include <linux/tty_flip.h>
  44 #include <linux/serial_core.h>
  45
  46 #include <asm/gpio.h>
  47 #include <asm/mach/bfin_serial_5xx.h>
  48
  49 #ifdef CONFIG_SERIAL_BFIN_DMA
  50 #include <linux/dma-mapping.h>
  51 #include <asm/io.h>
  52 #include <asm/irq.h>
  53 #include <asm/cacheflush.h>
  54 #endif
  55
  56 /* UART name and device definitions */
  57 #define BFIN_SERIAL_NAME        "ttyBF"
  58 #define BFIN_SERIAL_MAJOR       204
  59 #define BFIN_SERIAL_MINOR       64
  60
  61 /*
  62  * Setup for console. Argument comes from the menuconfig
  63  */
  64 #define DMA_RX_XCOUNT           512
  65 #define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
  66
  67 #define DMA_RX_FLUSH_JIFFIES    5
  68
  69 #ifdef CONFIG_SERIAL_BFIN_DMA
  70 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
  71 #else
  72 static void bfin_serial_do_work(struct work_struct *work);
  73 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
  74 static void local_put_char(struct bfin_serial_port *uart, char ch);
  75 #endif
  76
  77 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
  78
  79 /*
  80  * interrupts are disabled on entry
  81  */
  82 static void bfin_serial_stop_tx(struct uart_port *port)
  83 {
  84         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
  85
  86 #ifdef CONFIG_SERIAL_BFIN_DMA
  87         disable_dma(uart->tx_dma_channel);
  88 #else
  89         unsigned short ier;
  90
  91         ier = UART_GET_IER(uart);
  92         ier &= ~ETBEI;
  93         UART_PUT_IER(uart, ier);
  94 #endif
  95 }
  96
  97 /*
  98  * port is locked and interrupts are disabled
  99  */
 100 static void bfin_serial_start_tx(struct uart_port *port)
 101 {
 102         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 103
 104 #ifdef CONFIG_SERIAL_BFIN_DMA
 105         bfin_serial_dma_tx_chars(uart);
 106 #else
 107         unsigned short ier;
 108         ier = UART_GET_IER(uart);
 109         ier |= ETBEI;
 110         UART_PUT_IER(uart, ier);
 111         bfin_serial_tx_chars(uart);
 112 #endif
 113 }
 114
 115 /*
 116  * Interrupts are enabled
 117  */
 118 static void bfin_serial_stop_rx(struct uart_port *port)
 119 {
 120         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 121         unsigned short ier;
 122
 123         ier = UART_GET_IER(uart);
 124         ier &= ~ERBFI;
 125         UART_PUT_IER(uart, ier);
 126 }
 127
 128 /*
 129  * Set the modem control timer to fire immediately.
 130  */
 131 static void bfin_serial_enable_ms(struct uart_port *port)
 132 {
 133 }
 134
 135 #ifdef CONFIG_SERIAL_BFIN_PIO
 136 static void local_put_char(struct bfin_serial_port *uart, char ch)
 137 {
 138         unsigned short status;
 139         int flags = 0;
 140
 141         spin_lock_irqsave(&uart->port.lock, flags);
 142
 143         do {
 144                 status = UART_GET_LSR(uart);
 145         } while (!(status & THRE));
 146
 147         UART_PUT_CHAR(uart, ch);
 148         SSYNC();
 149
 150         spin_unlock_irqrestore(&uart->port.lock, flags);
 151 }
 152
 153 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 154 {
 155         struct tty_struct *tty = uart->port.info?uart->port.info->tty:0;
 156         unsigned int status, ch, flg;
 157 #ifdef BF533_FAMILY
 158         static int in_break = 0;
 159 #endif
 160
 161         status = UART_GET_LSR(uart);
 162         ch = UART_GET_CHAR(uart);
 163         uart->port.icount.rx++;
 164
 165 #ifdef BF533_FAMILY
 166         /* The BF533 family of processors have a nice misbehavior where
 167          * they continuously generate characters for a "single" break.
 168          * We have to basically ignore this flood until the "next" valid
 169          * character comes across.  All other Blackfin families operate
 170          * properly though.
 171          */
 172         if (in_break) {
 173                 if (ch != 0) {
 174                         in_break = 0;
 175                         ch = UART_GET_CHAR(uart);
 176                 }
 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                 flg = TTY_BREAK;
 189         } else if (status & PE) {
 190                 flg = TTY_PARITY;
 191                 uart->port.icount.parity++;
 192         } else if (status & OE) {
 193                 flg = TTY_OVERRUN;
 194                 uart->port.icount.overrun++;
 195         } else if (status & FE) {
 196                 flg = TTY_FRAME;
 197                 uart->port.icount.frame++;
 198         } else
 199                 flg = TTY_NORMAL;
 200
 201         if (uart_handle_sysrq_char(&uart->port, ch))
 202                 goto ignore_char;
 203         if (tty)
 204                 uart_insert_char(&uart->port, status, 2, ch, flg);
 205
 206 ignore_char:
 207         if (tty)
 208                 tty_flip_buffer_push(tty);
 209 }
 210
 211 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 212 {
 213         struct circ_buf *xmit = &uart->port.info->xmit;
 214
 215         if (uart->port.x_char) {
 216                 UART_PUT_CHAR(uart, uart->port.x_char);
 217                 uart->port.icount.tx++;
 218                 uart->port.x_char = 0;
 219                 return;
 220         }
 221         /*
 222          * Check the modem control lines before
 223          * transmitting anything.
 224          */
 225         bfin_serial_mctrl_check(uart);
 226
 227         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 228                 bfin_serial_stop_tx(&uart->port);
 229                 return;
 230         }
 231
 232         local_put_char(uart, xmit->buf[xmit->tail]);
 233         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 234         uart->port.icount.tx++;
 235
 236         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 237                 uart_write_wakeup(&uart->port);
 238
 239         if (uart_circ_empty(xmit))
 240                 bfin_serial_stop_tx(&uart->port);
 241 }
 242
 243 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
 244 {
 245         struct bfin_serial_port *uart = dev_id;
 246
 247         spin_lock(&uart->port.lock);
 248         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY)
 249                 bfin_serial_rx_chars(uart);
 250         spin_unlock(&uart->port.lock);
 251         return IRQ_HANDLED;
 252 }
 253
 254 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
 255 {
 256         struct bfin_serial_port *uart = dev_id;
 257         unsigned short status;
 258
 259         spin_lock(&uart->port.lock);
 260         while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)
 261                 bfin_serial_tx_chars(uart);
 262         spin_unlock(&uart->port.lock);
 263         return IRQ_HANDLED;
 264 }
 265
 266
 267 static void bfin_serial_do_work(struct work_struct *work)
 268 {
 269         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 270
 271         bfin_serial_mctrl_check(uart);
 272 }
 273
 274 #endif
 275
 276 #ifdef CONFIG_SERIAL_BFIN_DMA
 277 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 278 {
 279         struct circ_buf *xmit = &uart->port.info->xmit;
 280         unsigned short ier;
 281         int flags = 0;
 282
 283         if (!uart->tx_done)
 284                 return;
 285
 286         uart->tx_done = 0;
 287
 288         if (uart->port.x_char) {
 289                 UART_PUT_CHAR(uart, uart->port.x_char);
 290                 uart->port.icount.tx++;
 291                 uart->port.x_char = 0;
 292                 uart->tx_done = 1;
 293                 return;
 294         }
 295         /*
 296          * Check the modem control lines before
 297          * transmitting anything.
 298          */
 299         bfin_serial_mctrl_check(uart);
 300
 301         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 302                 bfin_serial_stop_tx(&uart->port);
 303                 uart->tx_done = 1;
 304                 return;
 305         }
 306
 307         spin_lock_irqsave(&uart->port.lock, flags);
 308         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 309         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 310                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 311         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 312                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 313         set_dma_config(uart->tx_dma_channel,
 314                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 315                         INTR_ON_BUF,
 316                         DIMENSION_LINEAR,
 317                         DATA_SIZE_8));
 318         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 319         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 320         set_dma_x_modify(uart->tx_dma_channel, 1);
 321         enable_dma(uart->tx_dma_channel);
 322         ier = UART_GET_IER(uart);
 323         ier |= ETBEI;
 324         UART_PUT_IER(uart, ier);
 325         spin_unlock_irqrestore(&uart->port.lock, flags);
 326 }
 327
 328 static void bfin_serial_dma_rx_chars(struct bfin_serial_port * uart)
 329 {
 330         struct tty_struct *tty = uart->port.info->tty;
 331         int i, flg, status;
 332
 333         status = UART_GET_LSR(uart);
 334         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 335
 336         if (status & BI) {
 337                 uart->port.icount.brk++;
 338                 if (uart_handle_break(&uart->port))
 339                         goto dma_ignore_char;
 340                 flg = TTY_BREAK;
 341         } else if (status & PE) {
 342                 flg = TTY_PARITY;
 343                 uart->port.icount.parity++;
 344         } else if (status & OE) {
 345                 flg = TTY_OVERRUN;
 346                 uart->port.icount.overrun++;
 347         } else if (status & FE) {
 348                 flg = TTY_FRAME;
 349                 uart->port.icount.frame++;
 350         } else
 351                 flg = TTY_NORMAL;
 352
 353         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 354                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 355                         goto dma_ignore_char;
 356                 uart_insert_char(&uart->port, status, 2, uart->rx_dma_buf.buf[i], flg);
 357         }
 358 dma_ignore_char:
 359         tty_flip_buffer_push(tty);
 360 }
 361
 362 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 363 {
 364         int x_pos, pos;
 365         int flags = 0;
 366
 367         bfin_serial_dma_tx_chars(uart);
 368
 369         spin_lock_irqsave(&uart->port.lock, flags);
 370         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 371         if (x_pos == DMA_RX_XCOUNT)
 372                 x_pos = 0;
 373
 374         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 375
 376         if (pos>uart->rx_dma_buf.tail) {
 377                 uart->rx_dma_buf.tail = pos;
 378                 bfin_serial_dma_rx_chars(uart);
 379                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 380         }
 381         spin_unlock_irqrestore(&uart->port.lock, flags);
 382         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 383         add_timer(&(uart->rx_dma_timer));
 384 }
 385
 386 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 387 {
 388         struct bfin_serial_port *uart = dev_id;
 389         struct circ_buf *xmit = &uart->port.info->xmit;
 390         unsigned short ier;
 391
 392         spin_lock(&uart->port.lock);
 393         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 394                 clear_dma_irqstat(uart->tx_dma_channel);
 395                 disable_dma(uart->tx_dma_channel);
 396                 ier = UART_GET_IER(uart);
 397                 ier &= ~ETBEI;
 398                 UART_PUT_IER(uart, ier);
 399                 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
 400                 uart->port.icount.tx+=uart->tx_count;
 401
 402                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 403                         uart_write_wakeup(&uart->port);
 404
 405                 if (uart_circ_empty(xmit))
 406                         bfin_serial_stop_tx(&uart->port);
 407                 uart->tx_done = 1;
 408         }
 409
 410         spin_unlock(&uart->port.lock);
 411         return IRQ_HANDLED;
 412 }
 413
 414 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 415 {
 416         struct bfin_serial_port *uart = dev_id;
 417         unsigned short irqstat;
 418
 419         uart->rx_dma_nrows++;
 420         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 421                 uart->rx_dma_nrows = 0;
 422                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 423                 bfin_serial_dma_rx_chars(uart);
 424                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 425         }
 426         spin_lock(&uart->port.lock);
 427         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 428         clear_dma_irqstat(uart->rx_dma_channel);
 429
 430         spin_unlock(&uart->port.lock);
 431         return IRQ_HANDLED;
 432 }
 433 #endif
 434
 435 /*
 436  * Return TIOCSER_TEMT when transmitter is not busy.
 437  */
 438 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 439 {
 440         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 441         unsigned short lsr;
 442
 443         lsr = UART_GET_LSR(uart);
 444         if (lsr & TEMT)
 445                 return TIOCSER_TEMT;
 446         else
 447                 return 0;
 448 }
 449
 450 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 451 {
 452 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 453         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 454         if (uart->cts_pin < 0)
 455                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 456
 457         if (gpio_get_value(uart->cts_pin))
 458                 return TIOCM_DSR | TIOCM_CAR;
 459         else
 460 #endif
 461                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 462 }
 463
 464 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 465 {
 466 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 467         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 468         if (uart->rts_pin < 0)
 469                 return;
 470
 471         if (mctrl & TIOCM_RTS)
 472                 gpio_set_value(uart->rts_pin, 0);
 473         else
 474                 gpio_set_value(uart->rts_pin, 1);
 475 #endif
 476 }
 477
 478 /*
 479  * Handle any change of modem status signal since we were last called.
 480  */
 481 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 482 {
 483 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 484         unsigned int status;
 485 # ifdef CONFIG_SERIAL_BFIN_DMA
 486         struct uart_info *info = uart->port.info;
 487         struct tty_struct *tty = info->tty;
 488
 489         status = bfin_serial_get_mctrl(&uart->port);
 490         if (!(status & TIOCM_CTS)) {
 491                 tty->hw_stopped = 1;
 492         } else {
 493                 tty->hw_stopped = 0;
 494         }
 495 # else
 496         status = bfin_serial_get_mctrl(&uart->port);
 497         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 498         if (!(status & TIOCM_CTS))
 499                 schedule_work(&uart->cts_workqueue);
 500 # endif
 501 #endif
 502 }
 503
 504 /*
 505  * Interrupts are always disabled.
 506  */
 507 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 508 {
 509 }
 510
 511 static int bfin_serial_startup(struct uart_port *port)
 512 {
 513         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 514
 515 #ifdef CONFIG_SERIAL_BFIN_DMA
 516         dma_addr_t dma_handle;
 517
 518         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 519                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 520                 return -EBUSY;
 521         }
 522
 523         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 524                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 525                 free_dma(uart->rx_dma_channel);
 526                 return -EBUSY;
 527         }
 528
 529         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 530         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 531
 532         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 533         uart->rx_dma_buf.head = 0;
 534         uart->rx_dma_buf.tail = 0;
 535         uart->rx_dma_nrows = 0;
 536
 537         set_dma_config(uart->rx_dma_channel,
 538                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 539                                 INTR_ON_ROW, DIMENSION_2D,
 540                                 DATA_SIZE_8));
 541         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 542         set_dma_x_modify(uart->rx_dma_channel, 1);
 543         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 544         set_dma_y_modify(uart->rx_dma_channel, 1);
 545         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 546         enable_dma(uart->rx_dma_channel);
 547
 548         uart->rx_dma_timer.data = (unsigned long)(uart);
 549         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 550         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 551         add_timer(&(uart->rx_dma_timer));
 552 #else
 553         if (request_irq
 554             (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
 555              "BFIN_UART_RX", uart)) {
 556                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 557                 return -EBUSY;
 558         }
 559
 560         if (request_irq
 561             (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
 562              "BFIN_UART_TX", uart)) {
 563                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 564                 free_irq(uart->port.irq, uart);
 565                 return -EBUSY;
 566         }
 567 #endif
 568         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 569         return 0;
 570 }
 571
 572 static void bfin_serial_shutdown(struct uart_port *port)
 573 {
 574         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 575
 576 #ifdef CONFIG_SERIAL_BFIN_DMA
 577         disable_dma(uart->tx_dma_channel);
 578         free_dma(uart->tx_dma_channel);
 579         disable_dma(uart->rx_dma_channel);
 580         free_dma(uart->rx_dma_channel);
 581         del_timer(&(uart->rx_dma_timer));
 582 #else
 583         free_irq(uart->port.irq, uart);
 584         free_irq(uart->port.irq+1, uart);
 585 #endif
 586 }
 587
 588 static void
 589 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 590                    struct ktermios *old)
 591 {
 592         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 593         unsigned long flags;
 594         unsigned int baud, quot;
 595         unsigned short val, ier, lsr, lcr = 0;
 596
 597         switch (termios->c_cflag & CSIZE) {
 598         case CS8:
 599                 lcr = WLS(8);
 600                 break;
 601         case CS7:
 602                 lcr = WLS(7);
 603                 break;
 604         case CS6:
 605                 lcr = WLS(6);
 606                 break;
 607         case CS5:
 608                 lcr = WLS(5);
 609                 break;
 610         default:
 611                 printk(KERN_ERR "%s: word lengh not supported\n",
 612                         __FUNCTION__);
 613         }
 614
 615         if (termios->c_cflag & CSTOPB)
 616                 lcr |= STB;
 617         if (termios->c_cflag & PARENB) {
 618                 lcr |= PEN;
 619                 if (!(termios->c_cflag & PARODD))
 620                         lcr |= EPS;
 621         }
 622
 623         /* These controls are not implemented for this port */
 624         termios->c_iflag |= INPCK | BRKINT | PARMRK;
 625         termios->c_iflag &= ~(IGNPAR | IGNBRK);
 626
 627         /* These controls are not implemented for this port */
 628         termios->c_iflag |= INPCK | BRKINT | PARMRK;
 629         termios->c_iflag &= ~(IGNPAR | IGNBRK);
 630
 631         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 632         quot = uart_get_divisor(port, baud);
 633         spin_lock_irqsave(&uart->port.lock, flags);
 634
 635         do {
 636                 lsr = UART_GET_LSR(uart);
 637         } while (!(lsr & TEMT));
 638
 639         /* Disable UART */
 640         ier = UART_GET_IER(uart);
 641         UART_PUT_IER(uart, 0);
 642
 643         /* Set DLAB in LCR to Access DLL and DLH */
 644         val = UART_GET_LCR(uart);
 645         val |= DLAB;
 646         UART_PUT_LCR(uart, val);
 647         SSYNC();
 648
 649         UART_PUT_DLL(uart, quot & 0xFF);
 650         SSYNC();
 651         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 652         SSYNC();
 653
 654         /* Clear DLAB in LCR to Access THR RBR IER */
 655         val = UART_GET_LCR(uart);
 656         val &= ~DLAB;
 657         UART_PUT_LCR(uart, val);
 658         SSYNC();
 659
 660         UART_PUT_LCR(uart, lcr);
 661
 662         /* Enable UART */
 663         UART_PUT_IER(uart, ier);
 664
 665         val = UART_GET_GCTL(uart);
 666         val |= UCEN;
 667         UART_PUT_GCTL(uart, val);
 668
 669         spin_unlock_irqrestore(&uart->port.lock, flags);
 670 }
 671
 672 static const char *bfin_serial_type(struct uart_port *port)
 673 {
 674         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 675
 676         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 677 }
 678
 679 /*
 680  * Release the memory region(s) being used by 'port'.
 681  */
 682 static void bfin_serial_release_port(struct uart_port *port)
 683 {
 684 }
 685
 686 /*
 687  * Request the memory region(s) being used by 'port'.
 688  */
 689 static int bfin_serial_request_port(struct uart_port *port)
 690 {
 691         return 0;
 692 }
 693
 694 /*
 695  * Configure/autoconfigure the port.
 696  */
 697 static void bfin_serial_config_port(struct uart_port *port, int flags)
 698 {
 699         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 700
 701         if (flags & UART_CONFIG_TYPE &&
 702             bfin_serial_request_port(&uart->port) == 0)
 703                 uart->port.type = PORT_BFIN;
 704 }
 705
 706 /*
 707  * Verify the new serial_struct (for TIOCSSERIAL).
 708  * The only change we allow are to the flags and type, and
 709  * even then only between PORT_BFIN and PORT_UNKNOWN
 710  */
 711 static int
 712 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 713 {
 714         return 0;
 715 }
 716
 717 static struct uart_ops bfin_serial_pops = {
 718         .tx_empty       = bfin_serial_tx_empty,
 719         .set_mctrl      = bfin_serial_set_mctrl,
 720         .get_mctrl      = bfin_serial_get_mctrl,
 721         .stop_tx        = bfin_serial_stop_tx,
 722         .start_tx       = bfin_serial_start_tx,
 723         .stop_rx        = bfin_serial_stop_rx,
 724         .enable_ms      = bfin_serial_enable_ms,
 725         .break_ctl      = bfin_serial_break_ctl,
 726         .startup        = bfin_serial_startup,
 727         .shutdown       = bfin_serial_shutdown,
 728         .set_termios    = bfin_serial_set_termios,
 729         .type           = bfin_serial_type,
 730         .release_port   = bfin_serial_release_port,
 731         .request_port   = bfin_serial_request_port,
 732         .config_port    = bfin_serial_config_port,
 733         .verify_port    = bfin_serial_verify_port,
 734 };
 735
 736 static void __init bfin_serial_init_ports(void)
 737 {
 738         static int first = 1;
 739         int i;
 740
 741         if (!first)
 742                 return;
 743         first = 0;
 744
 745         for (i = 0; i < nr_ports; i++) {
 746                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 747                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 748                 bfin_serial_ports[i].port.line      = i;
 749                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 750                 bfin_serial_ports[i].port.membase   =
 751                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 752                 bfin_serial_ports[i].port.mapbase   =
 753                         bfin_serial_resource[i].uart_base_addr;
 754                 bfin_serial_ports[i].port.irq       =
 755                         bfin_serial_resource[i].uart_irq;
 756                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 757 #ifdef CONFIG_SERIAL_BFIN_DMA
 758                 bfin_serial_ports[i].tx_done        = 1;
 759                 bfin_serial_ports[i].tx_count       = 0;
 760                 bfin_serial_ports[i].tx_dma_channel =
 761                         bfin_serial_resource[i].uart_tx_dma_channel;
 762                 bfin_serial_ports[i].rx_dma_channel =
 763                         bfin_serial_resource[i].uart_rx_dma_channel;
 764                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 765 #else
 766                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 767 #endif
 768 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 769                 bfin_serial_ports[i].cts_pin        =
 770                         bfin_serial_resource[i].uart_cts_pin;
 771                 bfin_serial_ports[i].rts_pin        =
 772                         bfin_serial_resource[i].uart_rts_pin;
 773 #endif
 774                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 775
 776         }
 777 }
 778
 779 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 780 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
 781 {
 782         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 783         while (!(UART_GET_LSR(uart)))
 784                 barrier();
 785         UART_PUT_CHAR(uart, ch);
 786         SSYNC();
 787 }
 788
 789 /*
 790  * Interrupts are disabled on entering
 791  */
 792 static void
 793 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
 794 {
 795         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
 796         int flags = 0;
 797
 798         spin_lock_irqsave(&uart->port.lock, flags);
 799         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
 800         spin_unlock_irqrestore(&uart->port.lock, flags);
 801
 802 }
 803
 804 /*
 805  * If the port was already initialised (eg, by a boot loader),
 806  * try to determine the current setup.
 807  */
 808 static void __init
 809 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 810                            int *parity, int *bits)
 811 {
 812         unsigned short status;
 813
 814         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 815         if (status == (ERBFI | ETBEI)) {
 816                 /* ok, the port was enabled */
 817                 unsigned short lcr, val;
 818                 unsigned short dlh, dll;
 819
 820                 lcr = UART_GET_LCR(uart);
 821
 822                 *parity = 'n';
 823                 if (lcr & PEN) {
 824                         if (lcr & EPS)
 825                                 *parity = 'e';
 826                         else
 827                                 *parity = 'o';
 828                 }
 829                 switch (lcr & 0x03) {
 830                         case 0: *bits = 5; break;
 831                         case 1: *bits = 6; break;
 832                         case 2: *bits = 7; break;
 833                         case 3: *bits = 8; break;
 834                 }
 835                 /* Set DLAB in LCR to Access DLL and DLH */
 836                 val = UART_GET_LCR(uart);
 837                 val |= DLAB;
 838                 UART_PUT_LCR(uart, val);
 839
 840                 dll = UART_GET_DLL(uart);
 841                 dlh = UART_GET_DLH(uart);
 842
 843                 /* Clear DLAB in LCR to Access THR RBR IER */
 844                 val = UART_GET_LCR(uart);
 845                 val &= ~DLAB;
 846                 UART_PUT_LCR(uart, val);
 847
 848                 *baud = get_sclk() / (16*(dll | dlh << 8));
 849         }
 850         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
 851 }
 852
 853 static int __init
 854 bfin_serial_console_setup(struct console *co, char *options)
 855 {
 856         struct bfin_serial_port *uart;
 857         int baud = 57600;
 858         int bits = 8;
 859         int parity = 'n';
 860 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 861         int flow = 'r';
 862 #else
 863         int flow = 'n';
 864 #endif
 865
 866         /*
 867          * Check whether an invalid uart number has been specified, and
 868          * if so, search for the first available port that does have
 869          * console support.
 870          */
 871         if (co->index == -1 || co->index >= nr_ports)
 872                 co->index = 0;
 873         uart = &bfin_serial_ports[co->index];
 874
 875         if (options)
 876                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 877         else
 878                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
 879
 880         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
 881 }
 882
 883 static struct uart_driver bfin_serial_reg;
 884 static struct console bfin_serial_console = {
 885         .name           = BFIN_SERIAL_NAME,
 886         .write          = bfin_serial_console_write,
 887         .device         = uart_console_device,
 888         .setup          = bfin_serial_console_setup,
 889         .flags          = CON_PRINTBUFFER,
 890         .index          = -1,
 891         .data           = &bfin_serial_reg,
 892 };
 893
 894 static int __init bfin_serial_rs_console_init(void)
 895 {
 896         bfin_serial_init_ports();
 897         register_console(&bfin_serial_console);
 898         return 0;
 899 }
 900 console_initcall(bfin_serial_rs_console_init);
 901
 902 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
 903 #else
 904 #define BFIN_SERIAL_CONSOLE     NULL
 905 #endif
 906
 907 static struct uart_driver bfin_serial_reg = {
 908         .owner                  = THIS_MODULE,
 909         .driver_name            = "bfin-uart",
 910         .dev_name               = BFIN_SERIAL_NAME,
 911         .major                  = BFIN_SERIAL_MAJOR,
 912         .minor                  = BFIN_SERIAL_MINOR,
 913         .nr                     = NR_PORTS,
 914         .cons                   = BFIN_SERIAL_CONSOLE,
 915 };
 916
 917 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
 918 {
 919         struct bfin_serial_port *uart = platform_get_drvdata(dev);
 920
 921         if (uart)
 922                 uart_suspend_port(&bfin_serial_reg, &uart->port);
 923
 924         return 0;
 925 }
 926
 927 static int bfin_serial_resume(struct platform_device *dev)
 928 {
 929         struct bfin_serial_port *uart = platform_get_drvdata(dev);
 930
 931         if (uart)
 932                 uart_resume_port(&bfin_serial_reg, &uart->port);
 933
 934         return 0;
 935 }
 936
 937 static int bfin_serial_probe(struct platform_device *dev)
 938 {
 939         struct resource *res = dev->resource;
 940         int i;
 941
 942         for (i = 0; i < dev->num_resources; i++, res++)
 943                 if (res->flags & IORESOURCE_MEM)
 944                         break;
 945
 946         if (i < dev->num_resources) {
 947                 for (i = 0; i < nr_ports; i++, res++) {
 948                         if (bfin_serial_ports[i].port.mapbase != res->start)
 949                                 continue;
 950                         bfin_serial_ports[i].port.dev = &dev->dev;
 951                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
 952                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
 953                 }
 954         }
 955
 956         return 0;
 957 }
 958
 959 static int bfin_serial_remove(struct platform_device *pdev)
 960 {
 961         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
 962
 963
 964 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 965         gpio_free(uart->cts_pin);
 966         gpio_free(uart->rts_pin);
 967 #endif
 968
 969         platform_set_drvdata(pdev, NULL);
 970
 971         if (uart)
 972                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
 973
 974         return 0;
 975 }
 976
 977 static struct platform_driver bfin_serial_driver = {
 978         .probe          = bfin_serial_probe,
 979         .remove         = bfin_serial_remove,
 980         .suspend        = bfin_serial_suspend,
 981         .resume         = bfin_serial_resume,
 982         .driver         = {
 983                 .name   = "bfin-uart",
 984         },
 985 };
 986
 987 static int __init bfin_serial_init(void)
 988 {
 989         int ret;
 990
 991         pr_info("Serial: Blackfin serial driver\n");
 992
 993         bfin_serial_init_ports();
 994
 995         ret = uart_register_driver(&bfin_serial_reg);
 996         if (ret == 0) {
 997                 ret = platform_driver_register(&bfin_serial_driver);
 998                 if (ret) {
 999                         pr_debug("uart register failed\n");
1000                         uart_unregister_driver(&bfin_serial_reg);
1001                 }
1002         }
1003         return ret;
1004 }
1005
1006 static void __exit bfin_serial_exit(void)
1007 {
1008         platform_driver_unregister(&bfin_serial_driver);
1009         uart_unregister_driver(&bfin_serial_reg);
1010 }
1011
1012 module_init(bfin_serial_init);
1013 module_exit(bfin_serial_exit);
1014
1015 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1016 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1017 MODULE_LICENSE("GPL");
1018 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);