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