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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_int(int irq, void *dev_id)
 244 {
 245         struct bfin_serial_port *uart = dev_id;
 246         unsigned short status;
 247
 248         spin_lock(&uart->port.lock);
 249         status = UART_GET_IIR(uart);
 250         do {
 251                 if ((status & IIR_STATUS) == IIR_TX_READY)
 252                         bfin_serial_tx_chars(uart);
 253                 if ((status & IIR_STATUS) == IIR_RX_READY)
 254                         bfin_serial_rx_chars(uart);
 255                 status = UART_GET_IIR(uart);
 256         } while (status & (IIR_TX_READY | IIR_RX_READY));
 257         spin_unlock(&uart->port.lock);
 258         return IRQ_HANDLED;
 259 }
 260
 261 static void bfin_serial_do_work(struct work_struct *work)
 262 {
 263         struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
 264
 265         bfin_serial_mctrl_check(uart);
 266 }
 267
 268 #endif
 269
 270 #ifdef CONFIG_SERIAL_BFIN_DMA
 271 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
 272 {
 273         struct circ_buf *xmit = &uart->port.info->xmit;
 274         unsigned short ier;
 275         int flags = 0;
 276
 277         if (!uart->tx_done)
 278                 return;
 279
 280         uart->tx_done = 0;
 281
 282         if (uart->port.x_char) {
 283                 UART_PUT_CHAR(uart, uart->port.x_char);
 284                 uart->port.icount.tx++;
 285                 uart->port.x_char = 0;
 286                 uart->tx_done = 1;
 287                 return;
 288         }
 289         /*
 290          * Check the modem control lines before
 291          * transmitting anything.
 292          */
 293         bfin_serial_mctrl_check(uart);
 294
 295         if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
 296                 bfin_serial_stop_tx(&uart->port);
 297                 uart->tx_done = 1;
 298                 return;
 299         }
 300
 301         spin_lock_irqsave(&uart->port.lock, flags);
 302         uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
 303         if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
 304                 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
 305         blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
 306                                         (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
 307         set_dma_config(uart->tx_dma_channel,
 308                 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
 309                         INTR_ON_BUF,
 310                         DIMENSION_LINEAR,
 311                         DATA_SIZE_8));
 312         set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
 313         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
 314         set_dma_x_modify(uart->tx_dma_channel, 1);
 315         enable_dma(uart->tx_dma_channel);
 316         ier = UART_GET_IER(uart);
 317         ier |= ETBEI;
 318         UART_PUT_IER(uart, ier);
 319         spin_unlock_irqrestore(&uart->port.lock, flags);
 320 }
 321
 322 static void bfin_serial_dma_rx_chars(struct bfin_serial_port * uart)
 323 {
 324         struct tty_struct *tty = uart->port.info->tty;
 325         int i, flg, status;
 326
 327         status = UART_GET_LSR(uart);
 328         uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);;
 329
 330         if (status & BI) {
 331                 uart->port.icount.brk++;
 332                 if (uart_handle_break(&uart->port))
 333                         goto dma_ignore_char;
 334                 flg = TTY_BREAK;
 335         } else if (status & PE) {
 336                 flg = TTY_PARITY;
 337                 uart->port.icount.parity++;
 338         } else if (status & OE) {
 339                 flg = TTY_OVERRUN;
 340                 uart->port.icount.overrun++;
 341         } else if (status & FE) {
 342                 flg = TTY_FRAME;
 343                 uart->port.icount.frame++;
 344         } else
 345                 flg = TTY_NORMAL;
 346
 347         for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) {
 348                 if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
 349                         goto dma_ignore_char;
 350                 uart_insert_char(&uart->port, status, 2, uart->rx_dma_buf.buf[i], flg);
 351         }
 352 dma_ignore_char:
 353         tty_flip_buffer_push(tty);
 354 }
 355
 356 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
 357 {
 358         int x_pos, pos;
 359         int flags = 0;
 360
 361         bfin_serial_dma_tx_chars(uart);
 362
 363         spin_lock_irqsave(&uart->port.lock, flags);
 364         x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel);
 365         if (x_pos == DMA_RX_XCOUNT)
 366                 x_pos = 0;
 367
 368         pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
 369
 370         if (pos>uart->rx_dma_buf.tail) {
 371                 uart->rx_dma_buf.tail = pos;
 372                 bfin_serial_dma_rx_chars(uart);
 373                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail;
 374         }
 375         spin_unlock_irqrestore(&uart->port.lock, flags);
 376         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 377         add_timer(&(uart->rx_dma_timer));
 378 }
 379
 380 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 381 {
 382         struct bfin_serial_port *uart = dev_id;
 383         struct circ_buf *xmit = &uart->port.info->xmit;
 384         unsigned short ier;
 385
 386         spin_lock(&uart->port.lock);
 387         if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
 388                 clear_dma_irqstat(uart->tx_dma_channel);
 389                 disable_dma(uart->tx_dma_channel);
 390                 ier = UART_GET_IER(uart);
 391                 ier &= ~ETBEI;
 392                 UART_PUT_IER(uart, ier);
 393                 xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
 394                 uart->port.icount.tx+=uart->tx_count;
 395
 396                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 397                         uart_write_wakeup(&uart->port);
 398
 399                 if (uart_circ_empty(xmit))
 400                         bfin_serial_stop_tx(&uart->port);
 401                 uart->tx_done = 1;
 402         }
 403
 404         spin_unlock(&uart->port.lock);
 405         return IRQ_HANDLED;
 406 }
 407
 408 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 409 {
 410         struct bfin_serial_port *uart = dev_id;
 411         unsigned short irqstat;
 412
 413         uart->rx_dma_nrows++;
 414         if (uart->rx_dma_nrows == DMA_RX_YCOUNT) {
 415                 uart->rx_dma_nrows = 0;
 416                 uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT;
 417                 bfin_serial_dma_rx_chars(uart);
 418                 uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0;
 419         }
 420         spin_lock(&uart->port.lock);
 421         irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
 422         clear_dma_irqstat(uart->rx_dma_channel);
 423
 424         spin_unlock(&uart->port.lock);
 425         return IRQ_HANDLED;
 426 }
 427 #endif
 428
 429 /*
 430  * Return TIOCSER_TEMT when transmitter is not busy.
 431  */
 432 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 433 {
 434         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 435         unsigned short lsr;
 436
 437         lsr = UART_GET_LSR(uart);
 438         if (lsr & TEMT)
 439                 return TIOCSER_TEMT;
 440         else
 441                 return 0;
 442 }
 443
 444 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
 445 {
 446 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 447         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 448         if (uart->cts_pin < 0)
 449                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 450
 451         if (gpio_get_value(uart->cts_pin))
 452                 return TIOCM_DSR | TIOCM_CAR;
 453         else
 454 #endif
 455                 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 456 }
 457
 458 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 459 {
 460 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 461         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 462         if (uart->rts_pin < 0)
 463                 return;
 464
 465         if (mctrl & TIOCM_RTS)
 466                 gpio_set_value(uart->rts_pin, 0);
 467         else
 468                 gpio_set_value(uart->rts_pin, 1);
 469 #endif
 470 }
 471
 472 /*
 473  * Handle any change of modem status signal since we were last called.
 474  */
 475 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
 476 {
 477 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 478         unsigned int status;
 479 # ifdef CONFIG_SERIAL_BFIN_DMA
 480         struct uart_info *info = uart->port.info;
 481         struct tty_struct *tty = info->tty;
 482
 483         status = bfin_serial_get_mctrl(&uart->port);
 484         if (!(status & TIOCM_CTS)) {
 485                 tty->hw_stopped = 1;
 486         } else {
 487                 tty->hw_stopped = 0;
 488         }
 489 # else
 490         status = bfin_serial_get_mctrl(&uart->port);
 491         uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
 492         if (!(status & TIOCM_CTS))
 493                 schedule_work(&uart->cts_workqueue);
 494 # endif
 495 #endif
 496 }
 497
 498 /*
 499  * Interrupts are always disabled.
 500  */
 501 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
 502 {
 503 }
 504
 505 static int bfin_serial_startup(struct uart_port *port)
 506 {
 507         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 508
 509 #ifdef CONFIG_SERIAL_BFIN_DMA
 510         dma_addr_t dma_handle;
 511
 512         if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
 513                 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
 514                 return -EBUSY;
 515         }
 516
 517         if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
 518                 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
 519                 free_dma(uart->rx_dma_channel);
 520                 return -EBUSY;
 521         }
 522
 523         set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
 524         set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
 525
 526         uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
 527         uart->rx_dma_buf.head = 0;
 528         uart->rx_dma_buf.tail = 0;
 529         uart->rx_dma_nrows = 0;
 530
 531         set_dma_config(uart->rx_dma_channel,
 532                 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
 533                                 INTR_ON_ROW, DIMENSION_2D,
 534                                 DATA_SIZE_8));
 535         set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
 536         set_dma_x_modify(uart->rx_dma_channel, 1);
 537         set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
 538         set_dma_y_modify(uart->rx_dma_channel, 1);
 539         set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
 540         enable_dma(uart->rx_dma_channel);
 541
 542         uart->rx_dma_timer.data = (unsigned long)(uart);
 543         uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
 544         uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
 545         add_timer(&(uart->rx_dma_timer));
 546 #else
 547         if (request_irq
 548             (uart->port.irq, bfin_serial_int, IRQF_DISABLED,
 549              "BFIN_UART_RX", uart)) {
 550                 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 551                 return -EBUSY;
 552         }
 553
 554         if (request_irq
 555             (uart->port.irq+1, bfin_serial_int, IRQF_DISABLED,
 556              "BFIN_UART_TX", uart)) {
 557                 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
 558                 free_irq(uart->port.irq, uart);
 559                 return -EBUSY;
 560         }
 561 #endif
 562         UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
 563         return 0;
 564 }
 565
 566 static void bfin_serial_shutdown(struct uart_port *port)
 567 {
 568         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 569
 570 #ifdef CONFIG_SERIAL_BFIN_DMA
 571         disable_dma(uart->tx_dma_channel);
 572         free_dma(uart->tx_dma_channel);
 573         disable_dma(uart->rx_dma_channel);
 574         free_dma(uart->rx_dma_channel);
 575         del_timer(&(uart->rx_dma_timer));
 576 #else
 577         free_irq(uart->port.irq, uart);
 578         free_irq(uart->port.irq+1, uart);
 579 #endif
 580 }
 581
 582 static void
 583 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 584                    struct ktermios *old)
 585 {
 586         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 587         unsigned long flags;
 588         unsigned int baud, quot;
 589         unsigned short val, ier, lsr, lcr = 0;
 590
 591         switch (termios->c_cflag & CSIZE) {
 592         case CS8:
 593                 lcr = WLS(8);
 594                 break;
 595         case CS7:
 596                 lcr = WLS(7);
 597                 break;
 598         case CS6:
 599                 lcr = WLS(6);
 600                 break;
 601         case CS5:
 602                 lcr = WLS(5);
 603                 break;
 604         default:
 605                 printk(KERN_ERR "%s: word lengh not supported\n",
 606                         __FUNCTION__);
 607         }
 608
 609         if (termios->c_cflag & CSTOPB)
 610                 lcr |= STB;
 611         if (termios->c_cflag & PARENB) {
 612                 lcr |= PEN;
 613                 if (!(termios->c_cflag & PARODD))
 614                         lcr |= EPS;
 615         }
 616
 617         /* These controls are not implemented for this port */
 618         termios->c_iflag |= INPCK | BRKINT | PARMRK;
 619         termios->c_iflag &= ~(IGNPAR | IGNBRK);
 620
 621         /* These controls are not implemented for this port */
 622         termios->c_iflag |= INPCK | BRKINT | PARMRK;
 623         termios->c_iflag &= ~(IGNPAR | IGNBRK);
 624
 625         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 626         quot = uart_get_divisor(port, baud);
 627         spin_lock_irqsave(&uart->port.lock, flags);
 628
 629         do {
 630                 lsr = UART_GET_LSR(uart);
 631         } while (!(lsr & TEMT));
 632
 633         /* Disable UART */
 634         ier = UART_GET_IER(uart);
 635         UART_PUT_IER(uart, 0);
 636
 637         /* Set DLAB in LCR to Access DLL and DLH */
 638         val = UART_GET_LCR(uart);
 639         val |= DLAB;
 640         UART_PUT_LCR(uart, val);
 641         SSYNC();
 642
 643         UART_PUT_DLL(uart, quot & 0xFF);
 644         SSYNC();
 645         UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
 646         SSYNC();
 647
 648         /* Clear DLAB in LCR to Access THR RBR IER */
 649         val = UART_GET_LCR(uart);
 650         val &= ~DLAB;
 651         UART_PUT_LCR(uart, val);
 652         SSYNC();
 653
 654         UART_PUT_LCR(uart, lcr);
 655
 656         /* Enable UART */
 657         UART_PUT_IER(uart, ier);
 658
 659         val = UART_GET_GCTL(uart);
 660         val |= UCEN;
 661         UART_PUT_GCTL(uart, val);
 662
 663         spin_unlock_irqrestore(&uart->port.lock, flags);
 664 }
 665
 666 static const char *bfin_serial_type(struct uart_port *port)
 667 {
 668         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 669
 670         return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
 671 }
 672
 673 /*
 674  * Release the memory region(s) being used by 'port'.
 675  */
 676 static void bfin_serial_release_port(struct uart_port *port)
 677 {
 678 }
 679
 680 /*
 681  * Request the memory region(s) being used by 'port'.
 682  */
 683 static int bfin_serial_request_port(struct uart_port *port)
 684 {
 685         return 0;
 686 }
 687
 688 /*
 689  * Configure/autoconfigure the port.
 690  */
 691 static void bfin_serial_config_port(struct uart_port *port, int flags)
 692 {
 693         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 694
 695         if (flags & UART_CONFIG_TYPE &&
 696             bfin_serial_request_port(&uart->port) == 0)
 697                 uart->port.type = PORT_BFIN;
 698 }
 699
 700 /*
 701  * Verify the new serial_struct (for TIOCSSERIAL).
 702  * The only change we allow are to the flags and type, and
 703  * even then only between PORT_BFIN and PORT_UNKNOWN
 704  */
 705 static int
 706 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 707 {
 708         return 0;
 709 }
 710
 711 static struct uart_ops bfin_serial_pops = {
 712         .tx_empty       = bfin_serial_tx_empty,
 713         .set_mctrl      = bfin_serial_set_mctrl,
 714         .get_mctrl      = bfin_serial_get_mctrl,
 715         .stop_tx        = bfin_serial_stop_tx,
 716         .start_tx       = bfin_serial_start_tx,
 717         .stop_rx        = bfin_serial_stop_rx,
 718         .enable_ms      = bfin_serial_enable_ms,
 719         .break_ctl      = bfin_serial_break_ctl,
 720         .startup        = bfin_serial_startup,
 721         .shutdown       = bfin_serial_shutdown,
 722         .set_termios    = bfin_serial_set_termios,
 723         .type           = bfin_serial_type,
 724         .release_port   = bfin_serial_release_port,
 725         .request_port   = bfin_serial_request_port,
 726         .config_port    = bfin_serial_config_port,
 727         .verify_port    = bfin_serial_verify_port,
 728 };
 729
 730 static void __init bfin_serial_init_ports(void)
 731 {
 732         static int first = 1;
 733         int i;
 734
 735         if (!first)
 736                 return;
 737         first = 0;
 738
 739         for (i = 0; i < nr_ports; i++) {
 740                 bfin_serial_ports[i].port.uartclk   = get_sclk();
 741                 bfin_serial_ports[i].port.ops       = &bfin_serial_pops;
 742                 bfin_serial_ports[i].port.line      = i;
 743                 bfin_serial_ports[i].port.iotype    = UPIO_MEM;
 744                 bfin_serial_ports[i].port.membase   =
 745                         (void __iomem *)bfin_serial_resource[i].uart_base_addr;
 746                 bfin_serial_ports[i].port.mapbase   =
 747                         bfin_serial_resource[i].uart_base_addr;
 748                 bfin_serial_ports[i].port.irq       =
 749                         bfin_serial_resource[i].uart_irq;
 750                 bfin_serial_ports[i].port.flags     = UPF_BOOT_AUTOCONF;
 751 #ifdef CONFIG_SERIAL_BFIN_DMA
 752                 bfin_serial_ports[i].tx_done        = 1;
 753                 bfin_serial_ports[i].tx_count       = 0;
 754                 bfin_serial_ports[i].tx_dma_channel =
 755                         bfin_serial_resource[i].uart_tx_dma_channel;
 756                 bfin_serial_ports[i].rx_dma_channel =
 757                         bfin_serial_resource[i].uart_rx_dma_channel;
 758                 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
 759 #else
 760                 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
 761 #endif
 762 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 763                 bfin_serial_ports[i].cts_pin        =
 764                         bfin_serial_resource[i].uart_cts_pin;
 765                 bfin_serial_ports[i].rts_pin        =
 766                         bfin_serial_resource[i].uart_rts_pin;
 767 #endif
 768                 bfin_serial_hw_init(&bfin_serial_ports[i]);
 769
 770         }
 771 }
 772
 773 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
 774 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
 775 {
 776         struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 777         while (!(UART_GET_LSR(uart)))
 778                 barrier();
 779         UART_PUT_CHAR(uart, ch);
 780         SSYNC();
 781 }
 782
 783 /*
 784  * Interrupts are disabled on entering
 785  */
 786 static void
 787 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
 788 {
 789         struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
 790         int flags = 0;
 791
 792         spin_lock_irqsave(&uart->port.lock, flags);
 793         uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
 794         spin_unlock_irqrestore(&uart->port.lock, flags);
 795
 796 }
 797
 798 /*
 799  * If the port was already initialised (eg, by a boot loader),
 800  * try to determine the current setup.
 801  */
 802 static void __init
 803 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 804                            int *parity, int *bits)
 805 {
 806         unsigned short status;
 807
 808         status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 809         if (status == (ERBFI | ETBEI)) {
 810                 /* ok, the port was enabled */
 811                 unsigned short lcr, val;
 812                 unsigned short dlh, dll;
 813
 814                 lcr = UART_GET_LCR(uart);
 815
 816                 *parity = 'n';
 817                 if (lcr & PEN) {
 818                         if (lcr & EPS)
 819                                 *parity = 'e';
 820                         else
 821                                 *parity = 'o';
 822                 }
 823                 switch (lcr & 0x03) {
 824                         case 0: *bits = 5; break;
 825                         case 1: *bits = 6; break;
 826                         case 2: *bits = 7; break;
 827                         case 3: *bits = 8; break;
 828                 }
 829                 /* Set DLAB in LCR to Access DLL and DLH */
 830                 val = UART_GET_LCR(uart);
 831                 val |= DLAB;
 832                 UART_PUT_LCR(uart, val);
 833
 834                 dll = UART_GET_DLL(uart);
 835                 dlh = UART_GET_DLH(uart);
 836
 837                 /* Clear DLAB in LCR to Access THR RBR IER */
 838                 val = UART_GET_LCR(uart);
 839                 val &= ~DLAB;
 840                 UART_PUT_LCR(uart, val);
 841
 842                 *baud = get_sclk() / (16*(dll | dlh << 8));
 843         }
 844         pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
 845 }
 846
 847 static int __init
 848 bfin_serial_console_setup(struct console *co, char *options)
 849 {
 850         struct bfin_serial_port *uart;
 851         int baud = 57600;
 852         int bits = 8;
 853         int parity = 'n';
 854 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 855         int flow = 'r';
 856 #else
 857         int flow = 'n';
 858 #endif
 859
 860         /*
 861          * Check whether an invalid uart number has been specified, and
 862          * if so, search for the first available port that does have
 863          * console support.
 864          */
 865         if (co->index == -1 || co->index >= nr_ports)
 866                 co->index = 0;
 867         uart = &bfin_serial_ports[co->index];
 868
 869         if (options)
 870                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 871         else
 872                 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
 873
 874         return uart_set_options(&uart->port, co, baud, parity, bits, flow);
 875 }
 876
 877 static struct uart_driver bfin_serial_reg;
 878 static struct console bfin_serial_console = {
 879         .name           = BFIN_SERIAL_NAME,
 880         .write          = bfin_serial_console_write,
 881         .device         = uart_console_device,
 882         .setup          = bfin_serial_console_setup,
 883         .flags          = CON_PRINTBUFFER,
 884         .index          = -1,
 885         .data           = &bfin_serial_reg,
 886 };
 887
 888 static int __init bfin_serial_rs_console_init(void)
 889 {
 890         bfin_serial_init_ports();
 891         register_console(&bfin_serial_console);
 892         return 0;
 893 }
 894 console_initcall(bfin_serial_rs_console_init);
 895
 896 #define BFIN_SERIAL_CONSOLE     &bfin_serial_console
 897 #else
 898 #define BFIN_SERIAL_CONSOLE     NULL
 899 #endif
 900
 901 static struct uart_driver bfin_serial_reg = {
 902         .owner                  = THIS_MODULE,
 903         .driver_name            = "bfin-uart",
 904         .dev_name               = BFIN_SERIAL_NAME,
 905         .major                  = BFIN_SERIAL_MAJOR,
 906         .minor                  = BFIN_SERIAL_MINOR,
 907         .nr                     = NR_PORTS,
 908         .cons                   = BFIN_SERIAL_CONSOLE,
 909 };
 910
 911 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
 912 {
 913         struct bfin_serial_port *uart = platform_get_drvdata(dev);
 914
 915         if (uart)
 916                 uart_suspend_port(&bfin_serial_reg, &uart->port);
 917
 918         return 0;
 919 }
 920
 921 static int bfin_serial_resume(struct platform_device *dev)
 922 {
 923         struct bfin_serial_port *uart = platform_get_drvdata(dev);
 924
 925         if (uart)
 926                 uart_resume_port(&bfin_serial_reg, &uart->port);
 927
 928         return 0;
 929 }
 930
 931 static int bfin_serial_probe(struct platform_device *dev)
 932 {
 933         struct resource *res = dev->resource;
 934         int i;
 935
 936         for (i = 0; i < dev->num_resources; i++, res++)
 937                 if (res->flags & IORESOURCE_MEM)
 938                         break;
 939
 940         if (i < dev->num_resources) {
 941                 for (i = 0; i < nr_ports; i++, res++) {
 942                         if (bfin_serial_ports[i].port.mapbase != res->start)
 943                                 continue;
 944                         bfin_serial_ports[i].port.dev = &dev->dev;
 945                         uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
 946                         platform_set_drvdata(dev, &bfin_serial_ports[i]);
 947                 }
 948         }
 949
 950         return 0;
 951 }
 952
 953 static int bfin_serial_remove(struct platform_device *pdev)
 954 {
 955         struct bfin_serial_port *uart = platform_get_drvdata(pdev);
 956
 957
 958 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
 959         gpio_free(uart->cts_pin);
 960         gpio_free(uart->rts_pin);
 961 #endif
 962
 963         platform_set_drvdata(pdev, NULL);
 964
 965         if (uart)
 966                 uart_remove_one_port(&bfin_serial_reg, &uart->port);
 967
 968         return 0;
 969 }
 970
 971 static struct platform_driver bfin_serial_driver = {
 972         .probe          = bfin_serial_probe,
 973         .remove         = bfin_serial_remove,
 974         .suspend        = bfin_serial_suspend,
 975         .resume         = bfin_serial_resume,
 976         .driver         = {
 977                 .name   = "bfin-uart",
 978         },
 979 };
 980
 981 static int __init bfin_serial_init(void)
 982 {
 983         int ret;
 984
 985         pr_info("Serial: Blackfin serial driver\n");
 986
 987         bfin_serial_init_ports();
 988
 989         ret = uart_register_driver(&bfin_serial_reg);
 990         if (ret == 0) {
 991                 ret = platform_driver_register(&bfin_serial_driver);
 992                 if (ret) {
 993                         pr_debug("uart register failed\n");
 994                         uart_unregister_driver(&bfin_serial_reg);
 995                 }
 996         }
 997         return ret;
 998 }
 999
1000 static void __exit bfin_serial_exit(void)
1001 {
1002         platform_driver_unregister(&bfin_serial_driver);
1003         uart_unregister_driver(&bfin_serial_reg);
1004 }
1005
1006 module_init(bfin_serial_init);
1007 module_exit(bfin_serial_exit);
1008
1009 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1010 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1011 MODULE_LICENSE("GPL");
1012 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);