drivers/serial/vr41xx_siu.c

   1 /*
   2  *  Driver for NEC VR4100 series Serial Interface Unit.
   3  *
   4  *  Copyright (C) 2004-2008  Yoichi Yuasa <yuasa@linux-mips.org>
   5  *
   6  *  Based on drivers/serial/8250.c, by Russell King.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  24 #define SUPPORT_SYSRQ
  25 #endif
  26
  27 #include <linux/console.h>
  28 #include <linux/errno.h>
  29 #include <linux/init.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/ioport.h>
  32 #include <linux/module.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/serial.h>
  35 #include <linux/serial_core.h>
  36 #include <linux/serial_reg.h>
  37 #include <linux/tty.h>
  38 #include <linux/tty_flip.h>
  39
  40 #include <asm/io.h>
  41 #include <asm/vr41xx/siu.h>
  42 #include <asm/vr41xx/vr41xx.h>
  43
  44 #define SIU_BAUD_BASE   1152000
  45 #define SIU_MAJOR       204
  46 #define SIU_MINOR_BASE  82
  47
  48 #define RX_MAX_COUNT    256
  49 #define TX_MAX_COUNT    15
  50
  51 #define SIUIRSEL        0x08
  52  #define TMICMODE       0x20
  53  #define TMICTX         0x10
  54  #define IRMSEL         0x0c
  55  #define IRMSEL_HP      0x08
  56  #define IRMSEL_TEMIC   0x04
  57  #define IRMSEL_SHARP   0x00
  58  #define IRUSESEL       0x02
  59  #define SIRSEL         0x01
  60
  61 static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
  62         [0 ... SIU_PORTS_MAX-1] = {
  63                 .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
  64                 .irq    = -1,
  65         },
  66 };
  67
  68 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
  69 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
  70 #endif
  71
  72 #define siu_read(port, offset)          readb((port)->membase + (offset))
  73 #define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
  74
  75 void vr41xx_select_siu_interface(siu_interface_t interface)
  76 {
  77         struct uart_port *port;
  78         unsigned long flags;
  79         uint8_t irsel;
  80
  81         port = &siu_uart_ports[0];
  82
  83         spin_lock_irqsave(&port->lock, flags);
  84
  85         irsel = siu_read(port, SIUIRSEL);
  86         if (interface == SIU_INTERFACE_IRDA)
  87                 irsel |= SIRSEL;
  88         else
  89                 irsel &= ~SIRSEL;
  90         siu_write(port, SIUIRSEL, irsel);
  91
  92         spin_unlock_irqrestore(&port->lock, flags);
  93 }
  94 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
  95
  96 void vr41xx_use_irda(irda_use_t use)
  97 {
  98         struct uart_port *port;
  99         unsigned long flags;
 100         uint8_t irsel;
 101
 102         port = &siu_uart_ports[0];
 103
 104         spin_lock_irqsave(&port->lock, flags);
 105
 106         irsel = siu_read(port, SIUIRSEL);
 107         if (use == FIR_USE_IRDA)
 108                 irsel |= IRUSESEL;
 109         else
 110                 irsel &= ~IRUSESEL;
 111         siu_write(port, SIUIRSEL, irsel);
 112
 113         spin_unlock_irqrestore(&port->lock, flags);
 114 }
 115 EXPORT_SYMBOL_GPL(vr41xx_use_irda);
 116
 117 void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
 118 {
 119         struct uart_port *port;
 120         unsigned long flags;
 121         uint8_t irsel;
 122
 123         port = &siu_uart_ports[0];
 124
 125         spin_lock_irqsave(&port->lock, flags);
 126
 127         irsel = siu_read(port, SIUIRSEL);
 128         irsel &= ~(IRMSEL | TMICTX | TMICMODE);
 129         switch (module) {
 130         case SHARP_IRDA:
 131                 irsel |= IRMSEL_SHARP;
 132                 break;
 133         case TEMIC_IRDA:
 134                 irsel |= IRMSEL_TEMIC | TMICMODE;
 135                 if (speed == IRDA_TX_4MBPS)
 136                         irsel |= TMICTX;
 137                 break;
 138         case HP_IRDA:
 139                 irsel |= IRMSEL_HP;
 140                 break;
 141         default:
 142                 break;
 143         }
 144         siu_write(port, SIUIRSEL, irsel);
 145
 146         spin_unlock_irqrestore(&port->lock, flags);
 147 }
 148 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
 149
 150 static inline void siu_clear_fifo(struct uart_port *port)
 151 {
 152         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
 153         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 154                                   UART_FCR_CLEAR_XMIT);
 155         siu_write(port, UART_FCR, 0);
 156 }
 157
 158 static inline unsigned long siu_port_size(struct uart_port *port)
 159 {
 160         switch (port->type) {
 161         case PORT_VR41XX_SIU:
 162                 return 11UL;
 163         case PORT_VR41XX_DSIU:
 164                 return 8UL;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static inline unsigned int siu_check_type(struct uart_port *port)
 171 {
 172         if (port->line == 0)
 173                 return PORT_VR41XX_SIU;
 174         if (port->line == 1 && port->irq != -1)
 175                 return PORT_VR41XX_DSIU;
 176
 177         return PORT_UNKNOWN;
 178 }
 179
 180 static inline const char *siu_type_name(struct uart_port *port)
 181 {
 182         switch (port->type) {
 183         case PORT_VR41XX_SIU:
 184                 return "SIU";
 185         case PORT_VR41XX_DSIU:
 186                 return "DSIU";
 187         }
 188
 189         return NULL;
 190 }
 191
 192 static unsigned int siu_tx_empty(struct uart_port *port)
 193 {
 194         uint8_t lsr;
 195
 196         lsr = siu_read(port, UART_LSR);
 197         if (lsr & UART_LSR_TEMT)
 198                 return TIOCSER_TEMT;
 199
 200         return 0;
 201 }
 202
 203 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 204 {
 205         uint8_t mcr = 0;
 206
 207         if (mctrl & TIOCM_DTR)
 208                 mcr |= UART_MCR_DTR;
 209         if (mctrl & TIOCM_RTS)
 210                 mcr |= UART_MCR_RTS;
 211         if (mctrl & TIOCM_OUT1)
 212                 mcr |= UART_MCR_OUT1;
 213         if (mctrl & TIOCM_OUT2)
 214                 mcr |= UART_MCR_OUT2;
 215         if (mctrl & TIOCM_LOOP)
 216                 mcr |= UART_MCR_LOOP;
 217
 218         siu_write(port, UART_MCR, mcr);
 219 }
 220
 221 static unsigned int siu_get_mctrl(struct uart_port *port)
 222 {
 223         uint8_t msr;
 224         unsigned int mctrl = 0;
 225
 226         msr = siu_read(port, UART_MSR);
 227         if (msr & UART_MSR_DCD)
 228                 mctrl |= TIOCM_CAR;
 229         if (msr & UART_MSR_RI)
 230                 mctrl |= TIOCM_RNG;
 231         if (msr & UART_MSR_DSR)
 232                 mctrl |= TIOCM_DSR;
 233         if (msr & UART_MSR_CTS)
 234                 mctrl |= TIOCM_CTS;
 235
 236         return mctrl;
 237 }
 238
 239 static void siu_stop_tx(struct uart_port *port)
 240 {
 241         unsigned long flags;
 242         uint8_t ier;
 243
 244         spin_lock_irqsave(&port->lock, flags);
 245
 246         ier = siu_read(port, UART_IER);
 247         ier &= ~UART_IER_THRI;
 248         siu_write(port, UART_IER, ier);
 249
 250         spin_unlock_irqrestore(&port->lock, flags);
 251 }
 252
 253 static void siu_start_tx(struct uart_port *port)
 254 {
 255         unsigned long flags;
 256         uint8_t ier;
 257
 258         spin_lock_irqsave(&port->lock, flags);
 259
 260         ier = siu_read(port, UART_IER);
 261         ier |= UART_IER_THRI;
 262         siu_write(port, UART_IER, ier);
 263
 264         spin_unlock_irqrestore(&port->lock, flags);
 265 }
 266
 267 static void siu_stop_rx(struct uart_port *port)
 268 {
 269         unsigned long flags;
 270         uint8_t ier;
 271
 272         spin_lock_irqsave(&port->lock, flags);
 273
 274         ier = siu_read(port, UART_IER);
 275         ier &= ~UART_IER_RLSI;
 276         siu_write(port, UART_IER, ier);
 277
 278         port->read_status_mask &= ~UART_LSR_DR;
 279
 280         spin_unlock_irqrestore(&port->lock, flags);
 281 }
 282
 283 static void siu_enable_ms(struct uart_port *port)
 284 {
 285         unsigned long flags;
 286         uint8_t ier;
 287
 288         spin_lock_irqsave(&port->lock, flags);
 289
 290         ier = siu_read(port, UART_IER);
 291         ier |= UART_IER_MSI;
 292         siu_write(port, UART_IER, ier);
 293
 294         spin_unlock_irqrestore(&port->lock, flags);
 295 }
 296
 297 static void siu_break_ctl(struct uart_port *port, int ctl)
 298 {
 299         unsigned long flags;
 300         uint8_t lcr;
 301
 302         spin_lock_irqsave(&port->lock, flags);
 303
 304         lcr = siu_read(port, UART_LCR);
 305         if (ctl == -1)
 306                 lcr |= UART_LCR_SBC;
 307         else
 308                 lcr &= ~UART_LCR_SBC;
 309         siu_write(port, UART_LCR, lcr);
 310
 311         spin_unlock_irqrestore(&port->lock, flags);
 312 }
 313
 314 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 315 {
 316         struct tty_struct *tty;
 317         uint8_t lsr, ch;
 318         char flag;
 319         int max_count = RX_MAX_COUNT;
 320
 321         tty = port->state->port.tty;
 322         lsr = *status;
 323
 324         do {
 325                 ch = siu_read(port, UART_RX);
 326                 port->icount.rx++;
 327                 flag = TTY_NORMAL;
 328
 329 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 330                 lsr |= lsr_break_flag[port->line];
 331                 lsr_break_flag[port->line] = 0;
 332 #endif
 333                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
 334                                     UART_LSR_PE | UART_LSR_OE))) {
 335                         if (lsr & UART_LSR_BI) {
 336                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 337                                 port->icount.brk++;
 338
 339                                 if (uart_handle_break(port))
 340                                         goto ignore_char;
 341                         }
 342
 343                         if (lsr & UART_LSR_FE)
 344                                 port->icount.frame++;
 345                         if (lsr & UART_LSR_PE)
 346                                 port->icount.parity++;
 347                         if (lsr & UART_LSR_OE)
 348                                 port->icount.overrun++;
 349
 350                         lsr &= port->read_status_mask;
 351                         if (lsr & UART_LSR_BI)
 352                                 flag = TTY_BREAK;
 353                         if (lsr & UART_LSR_FE)
 354                                 flag = TTY_FRAME;
 355                         if (lsr & UART_LSR_PE)
 356                                 flag = TTY_PARITY;
 357                 }
 358
 359                 if (uart_handle_sysrq_char(port, ch))
 360                         goto ignore_char;
 361
 362                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
 363
 364         ignore_char:
 365                 lsr = siu_read(port, UART_LSR);
 366         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 367
 368         tty_flip_buffer_push(tty);
 369
 370         *status = lsr;
 371 }
 372
 373 static inline void check_modem_status(struct uart_port *port)
 374 {
 375         uint8_t msr;
 376
 377         msr = siu_read(port, UART_MSR);
 378         if ((msr & UART_MSR_ANY_DELTA) == 0)
 379                 return;
 380         if (msr & UART_MSR_DDCD)
 381                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
 382         if (msr & UART_MSR_TERI)
 383                 port->icount.rng++;
 384         if (msr & UART_MSR_DDSR)
 385                 port->icount.dsr++;
 386         if (msr & UART_MSR_DCTS)
 387                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
 388
 389         wake_up_interruptible(&port->state->port.delta_msr_wait);
 390 }
 391
 392 static inline void transmit_chars(struct uart_port *port)
 393 {
 394         struct circ_buf *xmit;
 395         int max_count = TX_MAX_COUNT;
 396
 397         xmit = &port->state->xmit;
 398
 399         if (port->x_char) {
 400                 siu_write(port, UART_TX, port->x_char);
 401                 port->icount.tx++;
 402                 port->x_char = 0;
 403                 return;
 404         }
 405
 406         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 407                 siu_stop_tx(port);
 408                 return;
 409         }
 410
 411         do {
 412                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
 413                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 414                 port->icount.tx++;
 415                 if (uart_circ_empty(xmit))
 416                         break;
 417         } while (max_count-- > 0);
 418
 419         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 420                 uart_write_wakeup(port);
 421
 422         if (uart_circ_empty(xmit))
 423                 siu_stop_tx(port);
 424 }
 425
 426 static irqreturn_t siu_interrupt(int irq, void *dev_id)
 427 {
 428         struct uart_port *port;
 429         uint8_t iir, lsr;
 430
 431         port = (struct uart_port *)dev_id;
 432
 433         iir = siu_read(port, UART_IIR);
 434         if (iir & UART_IIR_NO_INT)
 435                 return IRQ_NONE;
 436
 437         lsr = siu_read(port, UART_LSR);
 438         if (lsr & UART_LSR_DR)
 439                 receive_chars(port, &lsr);
 440
 441         check_modem_status(port);
 442
 443         if (lsr & UART_LSR_THRE)
 444                 transmit_chars(port);
 445
 446         return IRQ_HANDLED;
 447 }
 448
 449 static int siu_startup(struct uart_port *port)
 450 {
 451         int retval;
 452
 453         if (port->membase == NULL)
 454                 return -ENODEV;
 455
 456         siu_clear_fifo(port);
 457
 458         (void)siu_read(port, UART_LSR);
 459         (void)siu_read(port, UART_RX);
 460         (void)siu_read(port, UART_IIR);
 461         (void)siu_read(port, UART_MSR);
 462
 463         if (siu_read(port, UART_LSR) == 0xff)
 464                 return -ENODEV;
 465
 466         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
 467         if (retval)
 468                 return retval;
 469
 470         if (port->type == PORT_VR41XX_DSIU)
 471                 vr41xx_enable_dsiuint(DSIUINT_ALL);
 472
 473         siu_write(port, UART_LCR, UART_LCR_WLEN8);
 474
 475         spin_lock_irq(&port->lock);
 476         siu_set_mctrl(port, port->mctrl);
 477         spin_unlock_irq(&port->lock);
 478
 479         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
 480
 481         (void)siu_read(port, UART_LSR);
 482         (void)siu_read(port, UART_RX);
 483         (void)siu_read(port, UART_IIR);
 484         (void)siu_read(port, UART_MSR);
 485
 486         return 0;
 487 }
 488
 489 static void siu_shutdown(struct uart_port *port)
 490 {
 491         unsigned long flags;
 492         uint8_t lcr;
 493
 494         siu_write(port, UART_IER, 0);
 495
 496         spin_lock_irqsave(&port->lock, flags);
 497
 498         port->mctrl &= ~TIOCM_OUT2;
 499         siu_set_mctrl(port, port->mctrl);
 500
 501         spin_unlock_irqrestore(&port->lock, flags);
 502
 503         lcr = siu_read(port, UART_LCR);
 504         lcr &= ~UART_LCR_SBC;
 505         siu_write(port, UART_LCR, lcr);
 506
 507         siu_clear_fifo(port);
 508
 509         (void)siu_read(port, UART_RX);
 510
 511         if (port->type == PORT_VR41XX_DSIU)
 512                 vr41xx_disable_dsiuint(DSIUINT_ALL);
 513
 514         free_irq(port->irq, port);
 515 }
 516
 517 static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 518                             struct ktermios *old)
 519 {
 520         tcflag_t c_cflag, c_iflag;
 521         uint8_t lcr, fcr, ier;
 522         unsigned int baud, quot;
 523         unsigned long flags;
 524
 525         c_cflag = new->c_cflag;
 526         switch (c_cflag & CSIZE) {
 527         case CS5:
 528                 lcr = UART_LCR_WLEN5;
 529                 break;
 530         case CS6:
 531                 lcr = UART_LCR_WLEN6;
 532                 break;
 533         case CS7:
 534                 lcr = UART_LCR_WLEN7;
 535                 break;
 536         default:
 537                 lcr = UART_LCR_WLEN8;
 538                 break;
 539         }
 540
 541         if (c_cflag & CSTOPB)
 542                 lcr |= UART_LCR_STOP;
 543         if (c_cflag & PARENB)
 544                 lcr |= UART_LCR_PARITY;
 545         if ((c_cflag & PARODD) != PARODD)
 546                 lcr |= UART_LCR_EPAR;
 547         if (c_cflag & CMSPAR)
 548                 lcr |= UART_LCR_SPAR;
 549
 550         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
 551         quot = uart_get_divisor(port, baud);
 552
 553         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
 554
 555         spin_lock_irqsave(&port->lock, flags);
 556
 557         uart_update_timeout(port, c_cflag, baud);
 558
 559         c_iflag = new->c_iflag;
 560
 561         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
 562         if (c_iflag & INPCK)
 563                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 564         if (c_iflag & (BRKINT | PARMRK))
 565                 port->read_status_mask |= UART_LSR_BI;
 566
 567         port->ignore_status_mask = 0;
 568         if (c_iflag & IGNPAR)
 569                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
 570         if (c_iflag & IGNBRK) {
 571                 port->ignore_status_mask |= UART_LSR_BI;
 572                 if (c_iflag & IGNPAR)
 573                         port->ignore_status_mask |= UART_LSR_OE;
 574         }
 575
 576         if ((c_cflag & CREAD) == 0)
 577                 port->ignore_status_mask |= UART_LSR_DR;
 578
 579         ier = siu_read(port, UART_IER);
 580         ier &= ~UART_IER_MSI;
 581         if (UART_ENABLE_MS(port, c_cflag))
 582                 ier |= UART_IER_MSI;
 583         siu_write(port, UART_IER, ier);
 584
 585         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
 586
 587         siu_write(port, UART_DLL, (uint8_t)quot);
 588         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
 589
 590         siu_write(port, UART_LCR, lcr);
 591
 592         siu_write(port, UART_FCR, fcr);
 593
 594         siu_set_mctrl(port, port->mctrl);
 595
 596         spin_unlock_irqrestore(&port->lock, flags);
 597 }
 598
 599 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
 600 {
 601         switch (state) {
 602         case 0:
 603                 switch (port->type) {
 604                 case PORT_VR41XX_SIU:
 605                         vr41xx_supply_clock(SIU_CLOCK);
 606                         break;
 607                 case PORT_VR41XX_DSIU:
 608                         vr41xx_supply_clock(DSIU_CLOCK);
 609                         break;
 610                 }
 611                 break;
 612         case 3:
 613                 switch (port->type) {
 614                 case PORT_VR41XX_SIU:
 615                         vr41xx_mask_clock(SIU_CLOCK);
 616                         break;
 617                 case PORT_VR41XX_DSIU:
 618                         vr41xx_mask_clock(DSIU_CLOCK);
 619                         break;
 620                 }
 621                 break;
 622         }
 623 }
 624
 625 static const char *siu_type(struct uart_port *port)
 626 {
 627         return siu_type_name(port);
 628 }
 629
 630 static void siu_release_port(struct uart_port *port)
 631 {
 632         unsigned long size;
 633
 634         if (port->flags & UPF_IOREMAP) {
 635                 iounmap(port->membase);
 636                 port->membase = NULL;
 637         }
 638
 639         size = siu_port_size(port);
 640         release_mem_region(port->mapbase, size);
 641 }
 642
 643 static int siu_request_port(struct uart_port *port)
 644 {
 645         unsigned long size;
 646         struct resource *res;
 647
 648         size = siu_port_size(port);
 649         res = request_mem_region(port->mapbase, size, siu_type_name(port));
 650         if (res == NULL)
 651                 return -EBUSY;
 652
 653         if (port->flags & UPF_IOREMAP) {
 654                 port->membase = ioremap(port->mapbase, size);
 655                 if (port->membase == NULL) {
 656                         release_resource(res);
 657                         return -ENOMEM;
 658                 }
 659         }
 660
 661         return 0;
 662 }
 663
 664 static void siu_config_port(struct uart_port *port, int flags)
 665 {
 666         if (flags & UART_CONFIG_TYPE) {
 667                 port->type = siu_check_type(port);
 668                 (void)siu_request_port(port);
 669         }
 670 }
 671
 672 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
 673 {
 674         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
 675                 return -EINVAL;
 676         if (port->irq != serial->irq)
 677                 return -EINVAL;
 678         if (port->iotype != serial->io_type)
 679                 return -EINVAL;
 680         if (port->mapbase != (unsigned long)serial->iomem_base)
 681                 return -EINVAL;
 682
 683         return 0;
 684 }
 685
 686 static struct uart_ops siu_uart_ops = {
 687         .tx_empty       = siu_tx_empty,
 688         .set_mctrl      = siu_set_mctrl,
 689         .get_mctrl      = siu_get_mctrl,
 690         .stop_tx        = siu_stop_tx,
 691         .start_tx       = siu_start_tx,
 692         .stop_rx        = siu_stop_rx,
 693         .enable_ms      = siu_enable_ms,
 694         .break_ctl      = siu_break_ctl,
 695         .startup        = siu_startup,
 696         .shutdown       = siu_shutdown,
 697         .set_termios    = siu_set_termios,
 698         .pm             = siu_pm,
 699         .type           = siu_type,
 700         .release_port   = siu_release_port,
 701         .request_port   = siu_request_port,
 702         .config_port    = siu_config_port,
 703         .verify_port    = siu_verify_port,
 704 };
 705
 706 static int siu_init_ports(struct platform_device *pdev)
 707 {
 708         struct uart_port *port;
 709         struct resource *res;
 710         int *type = pdev->dev.platform_data;
 711         int i;
 712
 713         if (!type)
 714                 return 0;
 715
 716         port = siu_uart_ports;
 717         for (i = 0; i < SIU_PORTS_MAX; i++) {
 718                 port->type = type[i];
 719                 if (port->type == PORT_UNKNOWN)
 720                         continue;
 721                 port->irq = platform_get_irq(pdev, i);
 722                 port->uartclk = SIU_BAUD_BASE * 16;
 723                 port->fifosize = 16;
 724                 port->regshift = 0;
 725                 port->iotype = UPIO_MEM;
 726                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 727                 port->line = i;
 728                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 729                 port->mapbase = res->start;
 730                 port++;
 731         }
 732
 733         return i;
 734 }
 735
 736 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 737
 738 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 739
 740 static void wait_for_xmitr(struct uart_port *port)
 741 {
 742         int timeout = 10000;
 743         uint8_t lsr, msr;
 744
 745         do {
 746                 lsr = siu_read(port, UART_LSR);
 747                 if (lsr & UART_LSR_BI)
 748                         lsr_break_flag[port->line] = UART_LSR_BI;
 749
 750                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
 751                         break;
 752         } while (timeout-- > 0);
 753
 754         if (port->flags & UPF_CONS_FLOW) {
 755                 timeout = 1000000;
 756
 757                 do {
 758                         msr = siu_read(port, UART_MSR);
 759                         if ((msr & UART_MSR_CTS) != 0)
 760                                 break;
 761                 } while (timeout-- > 0);
 762         }
 763 }
 764
 765 static void siu_console_putchar(struct uart_port *port, int ch)
 766 {
 767         wait_for_xmitr(port);
 768         siu_write(port, UART_TX, ch);
 769 }
 770
 771 static void siu_console_write(struct console *con, const char *s, unsigned count)
 772 {
 773         struct uart_port *port;
 774         uint8_t ier;
 775
 776         port = &siu_uart_ports[con->index];
 777
 778         ier = siu_read(port, UART_IER);
 779         siu_write(port, UART_IER, 0);
 780
 781         uart_console_write(port, s, count, siu_console_putchar);
 782
 783         wait_for_xmitr(port);
 784         siu_write(port, UART_IER, ier);
 785 }
 786
 787 static int __init siu_console_setup(struct console *con, char *options)
 788 {
 789         struct uart_port *port;
 790         int baud = 9600;
 791         int parity = 'n';
 792         int bits = 8;
 793         int flow = 'n';
 794
 795         if (con->index >= SIU_PORTS_MAX)
 796                 con->index = 0;
 797
 798         port = &siu_uart_ports[con->index];
 799         if (port->membase == NULL) {
 800                 if (port->mapbase == 0)
 801                         return -ENODEV;
 802                 port->membase = ioremap(port->mapbase, siu_port_size(port));
 803         }
 804
 805         if (port->type == PORT_VR41XX_SIU)
 806                 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 807
 808         if (options != NULL)
 809                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 810
 811         return uart_set_options(port, con, baud, parity, bits, flow);
 812 }
 813
 814 static struct uart_driver siu_uart_driver;
 815
 816 static struct console siu_console = {
 817         .name   = "ttyVR",
 818         .write  = siu_console_write,
 819         .device = uart_console_device,
 820         .setup  = siu_console_setup,
 821         .flags  = CON_PRINTBUFFER,
 822         .index  = -1,
 823         .data   = &siu_uart_driver,
 824 };
 825
 826 static int __devinit siu_console_init(void)
 827 {
 828         struct uart_port *port;
 829         int i;
 830
 831         for (i = 0; i < SIU_PORTS_MAX; i++) {
 832                 port = &siu_uart_ports[i];
 833                 port->ops = &siu_uart_ops;
 834         }
 835
 836         register_console(&siu_console);
 837
 838         return 0;
 839 }
 840
 841 console_initcall(siu_console_init);
 842
 843 void __init vr41xx_siu_early_setup(struct uart_port *port)
 844 {
 845         if (port->type == PORT_UNKNOWN)
 846                 return;
 847
 848         siu_uart_ports[port->line].line = port->line;
 849         siu_uart_ports[port->line].type = port->type;
 850         siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
 851         siu_uart_ports[port->line].mapbase = port->mapbase;
 852         siu_uart_ports[port->line].mapbase = port->mapbase;
 853         siu_uart_ports[port->line].ops = &siu_uart_ops;
 854 }
 855
 856 #define SERIAL_VR41XX_CONSOLE   &siu_console
 857 #else
 858 #define SERIAL_VR41XX_CONSOLE   NULL
 859 #endif
 860
 861 static struct uart_driver siu_uart_driver = {
 862         .owner          = THIS_MODULE,
 863         .driver_name    = "SIU",
 864         .dev_name       = "ttyVR",
 865         .major          = SIU_MAJOR,
 866         .minor          = SIU_MINOR_BASE,
 867         .cons           = SERIAL_VR41XX_CONSOLE,
 868 };
 869
 870 static int __devinit siu_probe(struct platform_device *dev)
 871 {
 872         struct uart_port *port;
 873         int num, i, retval;
 874
 875         num = siu_init_ports(dev);
 876         if (num <= 0)
 877                 return -ENODEV;
 878
 879         siu_uart_driver.nr = num;
 880         retval = uart_register_driver(&siu_uart_driver);
 881         if (retval)
 882                 return retval;
 883
 884         for (i = 0; i < num; i++) {
 885                 port = &siu_uart_ports[i];
 886                 port->ops = &siu_uart_ops;
 887                 port->dev = &dev->dev;
 888
 889                 retval = uart_add_one_port(&siu_uart_driver, port);
 890                 if (retval < 0) {
 891                         port->dev = NULL;
 892                         break;
 893                 }
 894         }
 895
 896         if (i == 0 && retval < 0) {
 897                 uart_unregister_driver(&siu_uart_driver);
 898                 return retval;
 899         }
 900
 901         return 0;
 902 }
 903
 904 static int __devexit siu_remove(struct platform_device *dev)
 905 {
 906         struct uart_port *port;
 907         int i;
 908
 909         for (i = 0; i < siu_uart_driver.nr; i++) {
 910                 port = &siu_uart_ports[i];
 911                 if (port->dev == &dev->dev) {
 912                         uart_remove_one_port(&siu_uart_driver, port);
 913                         port->dev = NULL;
 914                 }
 915         }
 916
 917         uart_unregister_driver(&siu_uart_driver);
 918
 919         return 0;
 920 }
 921
 922 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 923 {
 924         struct uart_port *port;
 925         int i;
 926
 927         for (i = 0; i < siu_uart_driver.nr; i++) {
 928                 port = &siu_uart_ports[i];
 929                 if ((port->type == PORT_VR41XX_SIU ||
 930                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 931                         uart_suspend_port(&siu_uart_driver, port);
 932
 933         }
 934
 935         return 0;
 936 }
 937
 938 static int siu_resume(struct platform_device *dev)
 939 {
 940         struct uart_port *port;
 941         int i;
 942
 943         for (i = 0; i < siu_uart_driver.nr; i++) {
 944                 port = &siu_uart_ports[i];
 945                 if ((port->type == PORT_VR41XX_SIU ||
 946                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 947                         uart_resume_port(&siu_uart_driver, port);
 948         }
 949
 950         return 0;
 951 }
 952
 953 static struct platform_driver siu_device_driver = {
 954         .probe          = siu_probe,
 955         .remove         = __devexit_p(siu_remove),
 956         .suspend        = siu_suspend,
 957         .resume         = siu_resume,
 958         .driver         = {
 959                 .name   = "SIU",
 960                 .owner  = THIS_MODULE,
 961         },
 962 };
 963
 964 static int __init vr41xx_siu_init(void)
 965 {
 966         return platform_driver_register(&siu_device_driver);
 967 }
 968
 969 static void __exit vr41xx_siu_exit(void)
 970 {
 971         platform_driver_unregister(&siu_device_driver);
 972 }
 973
 974 module_init(vr41xx_siu_init);
 975 module_exit(vr41xx_siu_exit);
 976
 977 MODULE_LICENSE("GPL");
 978 MODULE_ALIAS("platform:SIU");