release/src-rt-6.x/linux/linux-2.6/drivers/serial/vr41xx_siu.c

   1 /*
   2  *  Driver for NEC VR4100 series Serial Interface Unit.
   3  *
   4  *  Copyright (C) 2004-2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   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 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
  69
  70 #define siu_read(port, offset)          readb((port)->membase + (offset))
  71 #define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
  72
  73 void vr41xx_select_siu_interface(siu_interface_t interface)
  74 {
  75         struct uart_port *port;
  76         unsigned long flags;
  77         uint8_t irsel;
  78
  79         port = &siu_uart_ports[0];
  80
  81         spin_lock_irqsave(&port->lock, flags);
  82
  83         irsel = siu_read(port, SIUIRSEL);
  84         if (interface == SIU_INTERFACE_IRDA)
  85                 irsel |= SIRSEL;
  86         else
  87                 irsel &= ~SIRSEL;
  88         siu_write(port, SIUIRSEL, irsel);
  89
  90         spin_unlock_irqrestore(&port->lock, flags);
  91 }
  92
  93 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
  94
  95 void vr41xx_use_irda(irda_use_t use)
  96 {
  97         struct uart_port *port;
  98         unsigned long flags;
  99         uint8_t irsel;
 100
 101         port = &siu_uart_ports[0];
 102
 103         spin_lock_irqsave(&port->lock, flags);
 104
 105         irsel = siu_read(port, SIUIRSEL);
 106         if (use == FIR_USE_IRDA)
 107                 irsel |= IRUSESEL;
 108         else
 109                 irsel &= ~IRUSESEL;
 110         siu_write(port, SIUIRSEL, irsel);
 111
 112         spin_unlock_irqrestore(&port->lock, flags);
 113 }
 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
 149 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
 150
 151 static inline void siu_clear_fifo(struct uart_port *port)
 152 {
 153         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
 154         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 155                                   UART_FCR_CLEAR_XMIT);
 156         siu_write(port, UART_FCR, 0);
 157 }
 158
 159 static inline unsigned long siu_port_size(struct uart_port *port)
 160 {
 161         switch (port->type) {
 162         case PORT_VR41XX_SIU:
 163                 return 11UL;
 164         case PORT_VR41XX_DSIU:
 165                 return 8UL;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static inline unsigned int siu_check_type(struct uart_port *port)
 172 {
 173         if (port->line == 0)
 174                 return PORT_VR41XX_SIU;
 175         if (port->line == 1 && port->irq != -1)
 176                 return PORT_VR41XX_DSIU;
 177
 178         return PORT_UNKNOWN;
 179 }
 180
 181 static inline const char *siu_type_name(struct uart_port *port)
 182 {
 183         switch (port->type) {
 184         case PORT_VR41XX_SIU:
 185                 return "SIU";
 186         case PORT_VR41XX_DSIU:
 187                 return "DSIU";
 188         }
 189
 190         return NULL;
 191 }
 192
 193 static unsigned int siu_tx_empty(struct uart_port *port)
 194 {
 195         uint8_t lsr;
 196
 197         lsr = siu_read(port, UART_LSR);
 198         if (lsr & UART_LSR_TEMT)
 199                 return TIOCSER_TEMT;
 200
 201         return 0;
 202 }
 203
 204 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 205 {
 206         uint8_t mcr = 0;
 207
 208         if (mctrl & TIOCM_DTR)
 209                 mcr |= UART_MCR_DTR;
 210         if (mctrl & TIOCM_RTS)
 211                 mcr |= UART_MCR_RTS;
 212         if (mctrl & TIOCM_OUT1)
 213                 mcr |= UART_MCR_OUT1;
 214         if (mctrl & TIOCM_OUT2)
 215                 mcr |= UART_MCR_OUT2;
 216         if (mctrl & TIOCM_LOOP)
 217                 mcr |= UART_MCR_LOOP;
 218
 219         siu_write(port, UART_MCR, mcr);
 220 }
 221
 222 static unsigned int siu_get_mctrl(struct uart_port *port)
 223 {
 224         uint8_t msr;
 225         unsigned int mctrl = 0;
 226
 227         msr = siu_read(port, UART_MSR);
 228         if (msr & UART_MSR_DCD)
 229                 mctrl |= TIOCM_CAR;
 230         if (msr & UART_MSR_RI)
 231                 mctrl |= TIOCM_RNG;
 232         if (msr & UART_MSR_DSR)
 233                 mctrl |= TIOCM_DSR;
 234         if (msr & UART_MSR_CTS)
 235                 mctrl |= TIOCM_CTS;
 236
 237         return mctrl;
 238 }
 239
 240 static void siu_stop_tx(struct uart_port *port)
 241 {
 242         unsigned long flags;
 243         uint8_t ier;
 244
 245         spin_lock_irqsave(&port->lock, flags);
 246
 247         ier = siu_read(port, UART_IER);
 248         ier &= ~UART_IER_THRI;
 249         siu_write(port, UART_IER, ier);
 250
 251         spin_unlock_irqrestore(&port->lock, flags);
 252 }
 253
 254 static void siu_start_tx(struct uart_port *port)
 255 {
 256         unsigned long flags;
 257         uint8_t ier;
 258
 259         spin_lock_irqsave(&port->lock, flags);
 260
 261         ier = siu_read(port, UART_IER);
 262         ier |= UART_IER_THRI;
 263         siu_write(port, UART_IER, ier);
 264
 265         spin_unlock_irqrestore(&port->lock, flags);
 266 }
 267
 268 static void siu_stop_rx(struct uart_port *port)
 269 {
 270         unsigned long flags;
 271         uint8_t ier;
 272
 273         spin_lock_irqsave(&port->lock, flags);
 274
 275         ier = siu_read(port, UART_IER);
 276         ier &= ~UART_IER_RLSI;
 277         siu_write(port, UART_IER, ier);
 278
 279         port->read_status_mask &= ~UART_LSR_DR;
 280
 281         spin_unlock_irqrestore(&port->lock, flags);
 282 }
 283
 284 static void siu_enable_ms(struct uart_port *port)
 285 {
 286         unsigned long flags;
 287         uint8_t ier;
 288
 289         spin_lock_irqsave(&port->lock, flags);
 290
 291         ier = siu_read(port, UART_IER);
 292         ier |= UART_IER_MSI;
 293         siu_write(port, UART_IER, ier);
 294
 295         spin_unlock_irqrestore(&port->lock, flags);
 296 }
 297
 298 static void siu_break_ctl(struct uart_port *port, int ctl)
 299 {
 300         unsigned long flags;
 301         uint8_t lcr;
 302
 303         spin_lock_irqsave(&port->lock, flags);
 304
 305         lcr = siu_read(port, UART_LCR);
 306         if (ctl == -1)
 307                 lcr |= UART_LCR_SBC;
 308         else
 309                 lcr &= ~UART_LCR_SBC;
 310         siu_write(port, UART_LCR, lcr);
 311
 312         spin_unlock_irqrestore(&port->lock, flags);
 313 }
 314
 315 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 316 {
 317         struct tty_struct *tty;
 318         uint8_t lsr, ch;
 319         char flag;
 320         int max_count = RX_MAX_COUNT;
 321
 322         tty = port->info->tty;
 323         lsr = *status;
 324
 325         do {
 326                 ch = siu_read(port, UART_RX);
 327                 port->icount.rx++;
 328                 flag = TTY_NORMAL;
 329
 330 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 331                 lsr |= lsr_break_flag[port->line];
 332                 lsr_break_flag[port->line] = 0;
 333 #endif
 334                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
 335                                     UART_LSR_PE | UART_LSR_OE))) {
 336                         if (lsr & UART_LSR_BI) {
 337                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 338                                 port->icount.brk++;
 339
 340                                 if (uart_handle_break(port))
 341                                         goto ignore_char;
 342                         }
 343
 344                         if (lsr & UART_LSR_FE)
 345                                 port->icount.frame++;
 346                         if (lsr & UART_LSR_PE)
 347                                 port->icount.parity++;
 348                         if (lsr & UART_LSR_OE)
 349                                 port->icount.overrun++;
 350
 351                         lsr &= port->read_status_mask;
 352                         if (lsr & UART_LSR_BI)
 353                                 flag = TTY_BREAK;
 354                         if (lsr & UART_LSR_FE)
 355                                 flag = TTY_FRAME;
 356                         if (lsr & UART_LSR_PE)
 357                                 flag = TTY_PARITY;
 358                 }
 359
 360                 if (uart_handle_sysrq_char(port, ch))
 361                         goto ignore_char;
 362
 363                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
 364
 365         ignore_char:
 366                 lsr = siu_read(port, UART_LSR);
 367         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 368
 369         tty_flip_buffer_push(tty);
 370
 371         *status = lsr;
 372 }
 373
 374 static inline void check_modem_status(struct uart_port *port)
 375 {
 376         uint8_t msr;
 377
 378         msr = siu_read(port, UART_MSR);
 379         if ((msr & UART_MSR_ANY_DELTA) == 0)
 380                 return;
 381         if (msr & UART_MSR_DDCD)
 382                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
 383         if (msr & UART_MSR_TERI)
 384                 port->icount.rng++;
 385         if (msr & UART_MSR_DDSR)
 386                 port->icount.dsr++;
 387         if (msr & UART_MSR_DCTS)
 388                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
 389
 390         wake_up_interruptible(&port->info->delta_msr_wait);
 391 }
 392
 393 static inline void transmit_chars(struct uart_port *port)
 394 {
 395         struct circ_buf *xmit;
 396         int max_count = TX_MAX_COUNT;
 397
 398         xmit = &port->info->xmit;
 399
 400         if (port->x_char) {
 401                 siu_write(port, UART_TX, port->x_char);
 402                 port->icount.tx++;
 403                 port->x_char = 0;
 404                 return;
 405         }
 406
 407         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 408                 siu_stop_tx(port);
 409                 return;
 410         }
 411
 412         do {
 413                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
 414                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 415                 port->icount.tx++;
 416                 if (uart_circ_empty(xmit))
 417                         break;
 418         } while (max_count-- > 0);
 419
 420         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 421                 uart_write_wakeup(port);
 422
 423         if (uart_circ_empty(xmit))
 424                 siu_stop_tx(port);
 425 }
 426
 427 static irqreturn_t siu_interrupt(int irq, void *dev_id)
 428 {
 429         struct uart_port *port;
 430         uint8_t iir, lsr;
 431
 432         port = (struct uart_port *)dev_id;
 433
 434         iir = siu_read(port, UART_IIR);
 435         if (iir & UART_IIR_NO_INT)
 436                 return IRQ_NONE;
 437
 438         lsr = siu_read(port, UART_LSR);
 439         if (lsr & UART_LSR_DR)
 440                 receive_chars(port, &lsr);
 441
 442         check_modem_status(port);
 443
 444         if (lsr & UART_LSR_THRE)
 445                 transmit_chars(port);
 446
 447         return IRQ_HANDLED;
 448 }
 449
 450 static int siu_startup(struct uart_port *port)
 451 {
 452         int retval;
 453
 454         if (port->membase == NULL)
 455                 return -ENODEV;
 456
 457         siu_clear_fifo(port);
 458
 459         (void)siu_read(port, UART_LSR);
 460         (void)siu_read(port, UART_RX);
 461         (void)siu_read(port, UART_IIR);
 462         (void)siu_read(port, UART_MSR);
 463
 464         if (siu_read(port, UART_LSR) == 0xff)
 465                 return -ENODEV;
 466
 467         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
 468         if (retval)
 469                 return retval;
 470
 471         if (port->type == PORT_VR41XX_DSIU)
 472                 vr41xx_enable_dsiuint(DSIUINT_ALL);
 473
 474         siu_write(port, UART_LCR, UART_LCR_WLEN8);
 475
 476         spin_lock_irq(&port->lock);
 477         siu_set_mctrl(port, port->mctrl);
 478         spin_unlock_irq(&port->lock);
 479
 480         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
 481
 482         (void)siu_read(port, UART_LSR);
 483         (void)siu_read(port, UART_RX);
 484         (void)siu_read(port, UART_IIR);
 485         (void)siu_read(port, UART_MSR);
 486
 487         return 0;
 488 }
 489
 490 static void siu_shutdown(struct uart_port *port)
 491 {
 492         unsigned long flags;
 493         uint8_t lcr;
 494
 495         siu_write(port, UART_IER, 0);
 496
 497         spin_lock_irqsave(&port->lock, flags);
 498
 499         port->mctrl &= ~TIOCM_OUT2;
 500         siu_set_mctrl(port, port->mctrl);
 501
 502         spin_unlock_irqrestore(&port->lock, flags);
 503
 504         lcr = siu_read(port, UART_LCR);
 505         lcr &= ~UART_LCR_SBC;
 506         siu_write(port, UART_LCR, lcr);
 507
 508         siu_clear_fifo(port);
 509
 510         (void)siu_read(port, UART_RX);
 511
 512         if (port->type == PORT_VR41XX_DSIU)
 513                 vr41xx_disable_dsiuint(DSIUINT_ALL);
 514
 515         free_irq(port->irq, port);
 516 }
 517
 518 static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 519                             struct ktermios *old)
 520 {
 521         tcflag_t c_cflag, c_iflag;
 522         uint8_t lcr, fcr, ier;
 523         unsigned int baud, quot;
 524         unsigned long flags;
 525
 526         c_cflag = new->c_cflag;
 527         switch (c_cflag & CSIZE) {
 528         case CS5:
 529                 lcr = UART_LCR_WLEN5;
 530                 break;
 531         case CS6:
 532                 lcr = UART_LCR_WLEN6;
 533                 break;
 534         case CS7:
 535                 lcr = UART_LCR_WLEN7;
 536                 break;
 537         default:
 538                 lcr = UART_LCR_WLEN8;
 539                 break;
 540         }
 541
 542         if (c_cflag & CSTOPB)
 543                 lcr |= UART_LCR_STOP;
 544         if (c_cflag & PARENB)
 545                 lcr |= UART_LCR_PARITY;
 546         if ((c_cflag & PARODD) != PARODD)
 547                 lcr |= UART_LCR_EPAR;
 548         if (c_cflag & CMSPAR)
 549                 lcr |= UART_LCR_SPAR;
 550
 551         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
 552         quot = uart_get_divisor(port, baud);
 553
 554         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
 555
 556         spin_lock_irqsave(&port->lock, flags);
 557
 558         uart_update_timeout(port, c_cflag, baud);
 559
 560         c_iflag = new->c_iflag;
 561
 562         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
 563         if (c_iflag & INPCK)
 564                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 565         if (c_iflag & (BRKINT | PARMRK))
 566                 port->read_status_mask |= UART_LSR_BI;
 567
 568         port->ignore_status_mask = 0;
 569         if (c_iflag & IGNPAR)
 570                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
 571         if (c_iflag & IGNBRK) {
 572                 port->ignore_status_mask |= UART_LSR_BI;
 573                 if (c_iflag & IGNPAR)
 574                         port->ignore_status_mask |= UART_LSR_OE;
 575         }
 576
 577         if ((c_cflag & CREAD) == 0)
 578                 port->ignore_status_mask |= UART_LSR_DR;
 579
 580         ier = siu_read(port, UART_IER);
 581         ier &= ~UART_IER_MSI;
 582         if (UART_ENABLE_MS(port, c_cflag))
 583                 ier |= UART_IER_MSI;
 584         siu_write(port, UART_IER, ier);
 585
 586         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
 587
 588         siu_write(port, UART_DLL, (uint8_t)quot);
 589         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
 590
 591         siu_write(port, UART_LCR, lcr);
 592
 593         siu_write(port, UART_FCR, fcr);
 594
 595         siu_set_mctrl(port, port->mctrl);
 596
 597         spin_unlock_irqrestore(&port->lock, flags);
 598 }
 599
 600 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
 601 {
 602         switch (state) {
 603         case 0:
 604                 switch (port->type) {
 605                 case PORT_VR41XX_SIU:
 606                         vr41xx_supply_clock(SIU_CLOCK);
 607                         break;
 608                 case PORT_VR41XX_DSIU:
 609                         vr41xx_supply_clock(DSIU_CLOCK);
 610                         break;
 611                 }
 612                 break;
 613         case 3:
 614                 switch (port->type) {
 615                 case PORT_VR41XX_SIU:
 616                         vr41xx_mask_clock(SIU_CLOCK);
 617                         break;
 618                 case PORT_VR41XX_DSIU:
 619                         vr41xx_mask_clock(DSIU_CLOCK);
 620                         break;
 621                 }
 622                 break;
 623         }
 624 }
 625
 626 static const char *siu_type(struct uart_port *port)
 627 {
 628         return siu_type_name(port);
 629 }
 630
 631 static void siu_release_port(struct uart_port *port)
 632 {
 633         unsigned long size;
 634
 635         if (port->flags & UPF_IOREMAP) {
 636                 iounmap(port->membase);
 637                 port->membase = NULL;
 638         }
 639
 640         size = siu_port_size(port);
 641         release_mem_region(port->mapbase, size);
 642 }
 643
 644 static int siu_request_port(struct uart_port *port)
 645 {
 646         unsigned long size;
 647         struct resource *res;
 648
 649         size = siu_port_size(port);
 650         res = request_mem_region(port->mapbase, size, siu_type_name(port));
 651         if (res == NULL)
 652                 return -EBUSY;
 653
 654         if (port->flags & UPF_IOREMAP) {
 655                 port->membase = ioremap(port->mapbase, size);
 656                 if (port->membase == NULL) {
 657                         release_resource(res);
 658                         return -ENOMEM;
 659                 }
 660         }
 661
 662         return 0;
 663 }
 664
 665 static void siu_config_port(struct uart_port *port, int flags)
 666 {
 667         if (flags & UART_CONFIG_TYPE) {
 668                 port->type = siu_check_type(port);
 669                 (void)siu_request_port(port);
 670         }
 671 }
 672
 673 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
 674 {
 675         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
 676                 return -EINVAL;
 677         if (port->irq != serial->irq)
 678                 return -EINVAL;
 679         if (port->iotype != serial->io_type)
 680                 return -EINVAL;
 681         if (port->mapbase != (unsigned long)serial->iomem_base)
 682                 return -EINVAL;
 683
 684         return 0;
 685 }
 686
 687 static struct uart_ops siu_uart_ops = {
 688         .tx_empty       = siu_tx_empty,
 689         .set_mctrl      = siu_set_mctrl,
 690         .get_mctrl      = siu_get_mctrl,
 691         .stop_tx        = siu_stop_tx,
 692         .start_tx       = siu_start_tx,
 693         .stop_rx        = siu_stop_rx,
 694         .enable_ms      = siu_enable_ms,
 695         .break_ctl      = siu_break_ctl,
 696         .startup        = siu_startup,
 697         .shutdown       = siu_shutdown,
 698         .set_termios    = siu_set_termios,
 699         .pm             = siu_pm,
 700         .type           = siu_type,
 701         .release_port   = siu_release_port,
 702         .request_port   = siu_request_port,
 703         .config_port    = siu_config_port,
 704         .verify_port    = siu_verify_port,
 705 };
 706
 707 static int siu_init_ports(struct platform_device *pdev)
 708 {
 709         struct uart_port *port;
 710         struct resource *res;
 711         int *type = pdev->dev.platform_data;
 712         int i;
 713
 714         if (!type)
 715                 return 0;
 716
 717         port = siu_uart_ports;
 718         for (i = 0; i < SIU_PORTS_MAX; i++) {
 719                 port->type = type[i];
 720                 if (port->type == PORT_UNKNOWN)
 721                         continue;
 722                 port->irq = platform_get_irq(pdev, i);
 723                 port->uartclk = SIU_BAUD_BASE * 16;
 724                 port->fifosize = 16;
 725                 port->regshift = 0;
 726                 port->iotype = UPIO_MEM;
 727                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 728                 port->line = i;
 729                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 730                 port->mapbase = res->start;
 731                 port++;
 732         }
 733
 734         return i;
 735 }
 736
 737 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 738
 739 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 740
 741 static void wait_for_xmitr(struct uart_port *port)
 742 {
 743         int timeout = 10000;
 744         uint8_t lsr, msr;
 745
 746         do {
 747                 lsr = siu_read(port, UART_LSR);
 748                 if (lsr & UART_LSR_BI)
 749                         lsr_break_flag[port->line] = UART_LSR_BI;
 750
 751                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
 752                         break;
 753         } while (timeout-- > 0);
 754
 755         if (port->flags & UPF_CONS_FLOW) {
 756                 timeout = 1000000;
 757
 758                 do {
 759                         msr = siu_read(port, UART_MSR);
 760                         if ((msr & UART_MSR_CTS) != 0)
 761                                 break;
 762                 } while (timeout-- > 0);
 763         }
 764 }
 765
 766 static void siu_console_putchar(struct uart_port *port, int ch)
 767 {
 768         wait_for_xmitr(port);
 769         siu_write(port, UART_TX, ch);
 770 }
 771
 772 static void siu_console_write(struct console *con, const char *s, unsigned count)
 773 {
 774         struct uart_port *port;
 775         uint8_t ier;
 776
 777         port = &siu_uart_ports[con->index];
 778
 779         ier = siu_read(port, UART_IER);
 780         siu_write(port, UART_IER, 0);
 781
 782         uart_console_write(port, s, count, siu_console_putchar);
 783
 784         wait_for_xmitr(port);
 785         siu_write(port, UART_IER, ier);
 786 }
 787
 788 static int siu_console_setup(struct console *con, char *options)
 789 {
 790         struct uart_port *port;
 791         int baud = 9600;
 792         int parity = 'n';
 793         int bits = 8;
 794         int flow = 'n';
 795
 796         if (con->index >= SIU_PORTS_MAX)
 797                 con->index = 0;
 798
 799         port = &siu_uart_ports[con->index];
 800         if (port->membase == NULL) {
 801                 if (port->mapbase == 0)
 802                         return -ENODEV;
 803                 port->membase = ioremap(port->mapbase, siu_port_size(port));
 804         }
 805
 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 #define SERIAL_VR41XX_CONSOLE   &siu_console
 844 #else
 845 #define SERIAL_VR41XX_CONSOLE   NULL
 846 #endif
 847
 848 static struct uart_driver siu_uart_driver = {
 849         .owner          = THIS_MODULE,
 850         .driver_name    = "SIU",
 851         .dev_name       = "ttyVR",
 852         .major          = SIU_MAJOR,
 853         .minor          = SIU_MINOR_BASE,
 854         .cons           = SERIAL_VR41XX_CONSOLE,
 855 };
 856
 857 static int __devinit siu_probe(struct platform_device *dev)
 858 {
 859         struct uart_port *port;
 860         int num, i, retval;
 861
 862         num = siu_init_ports(dev);
 863         if (num <= 0)
 864                 return -ENODEV;
 865
 866         siu_uart_driver.nr = num;
 867         retval = uart_register_driver(&siu_uart_driver);
 868         if (retval)
 869                 return retval;
 870
 871         for (i = 0; i < num; i++) {
 872                 port = &siu_uart_ports[i];
 873                 port->ops = &siu_uart_ops;
 874                 port->dev = &dev->dev;
 875
 876                 retval = uart_add_one_port(&siu_uart_driver, port);
 877                 if (retval < 0) {
 878                         port->dev = NULL;
 879                         break;
 880                 }
 881         }
 882
 883         if (i == 0 && retval < 0) {
 884                 uart_unregister_driver(&siu_uart_driver);
 885                 return retval;
 886         }
 887
 888         return 0;
 889 }
 890
 891 static int __devexit siu_remove(struct platform_device *dev)
 892 {
 893         struct uart_port *port;
 894         int i;
 895
 896         for (i = 0; i < siu_uart_driver.nr; i++) {
 897                 port = &siu_uart_ports[i];
 898                 if (port->dev == &dev->dev) {
 899                         uart_remove_one_port(&siu_uart_driver, port);
 900                         port->dev = NULL;
 901                 }
 902         }
 903
 904         uart_unregister_driver(&siu_uart_driver);
 905
 906         return 0;
 907 }
 908
 909 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 910 {
 911         struct uart_port *port;
 912         int i;
 913
 914         for (i = 0; i < siu_uart_driver.nr; i++) {
 915                 port = &siu_uart_ports[i];
 916                 if ((port->type == PORT_VR41XX_SIU ||
 917                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 918                         uart_suspend_port(&siu_uart_driver, port);
 919
 920         }
 921
 922         return 0;
 923 }
 924
 925 static int siu_resume(struct platform_device *dev)
 926 {
 927         struct uart_port *port;
 928         int i;
 929
 930         for (i = 0; i < siu_uart_driver.nr; i++) {
 931                 port = &siu_uart_ports[i];
 932                 if ((port->type == PORT_VR41XX_SIU ||
 933                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 934                         uart_resume_port(&siu_uart_driver, port);
 935         }
 936
 937         return 0;
 938 }
 939
 940 static struct platform_driver siu_device_driver = {
 941         .probe          = siu_probe,
 942         .remove         = __devexit_p(siu_remove),
 943         .suspend        = siu_suspend,
 944         .resume         = siu_resume,
 945         .driver         = {
 946                 .name   = "SIU",
 947                 .owner  = THIS_MODULE,
 948         },
 949 };
 950
 951 static int __init vr41xx_siu_init(void)
 952 {
 953         return platform_driver_register(&siu_device_driver);
 954 }
 955
 956 static void __exit vr41xx_siu_exit(void)
 957 {
 958         platform_driver_unregister(&siu_device_driver);
 959 }
 960
 961 module_init(vr41xx_siu_init);
 962 module_exit(vr41xx_siu_exit);