drivers/tty/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    = 0,
  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)
 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         uint8_t lsr, ch;
 317         char flag;
 318         int max_count = RX_MAX_COUNT;
 319
 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(&port->state->port);
 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->state->port.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->state->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 & (IGNBRK | 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 = dev_get_platdata(&pdev->dev);
 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         if (port->type == PORT_VR41XX_SIU)
 804                 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 805
 806         if (options != NULL)
 807                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 808
 809         return uart_set_options(port, con, baud, parity, bits, flow);
 810 }
 811
 812 static struct uart_driver siu_uart_driver;
 813
 814 static struct console siu_console = {
 815         .name   = "ttyVR",
 816         .write  = siu_console_write,
 817         .device = uart_console_device,
 818         .setup  = siu_console_setup,
 819         .flags  = CON_PRINTBUFFER,
 820         .index  = -1,
 821         .data   = &siu_uart_driver,
 822 };
 823
 824 static int siu_console_init(void)
 825 {
 826         struct uart_port *port;
 827         int i;
 828
 829         for (i = 0; i < SIU_PORTS_MAX; i++) {
 830                 port = &siu_uart_ports[i];
 831                 port->ops = &siu_uart_ops;
 832         }
 833
 834         register_console(&siu_console);
 835
 836         return 0;
 837 }
 838
 839 console_initcall(siu_console_init);
 840
 841 void __init vr41xx_siu_early_setup(struct uart_port *port)
 842 {
 843         if (port->type == PORT_UNKNOWN)
 844                 return;
 845
 846         siu_uart_ports[port->line].line = port->line;
 847         siu_uart_ports[port->line].type = port->type;
 848         siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
 849         siu_uart_ports[port->line].mapbase = port->mapbase;
 850         siu_uart_ports[port->line].ops = &siu_uart_ops;
 851 }
 852
 853 #define SERIAL_VR41XX_CONSOLE   &siu_console
 854 #else
 855 #define SERIAL_VR41XX_CONSOLE   NULL
 856 #endif
 857
 858 static struct uart_driver siu_uart_driver = {
 859         .owner          = THIS_MODULE,
 860         .driver_name    = "SIU",
 861         .dev_name       = "ttyVR",
 862         .major          = SIU_MAJOR,
 863         .minor          = SIU_MINOR_BASE,
 864         .cons           = SERIAL_VR41XX_CONSOLE,
 865 };
 866
 867 static int siu_probe(struct platform_device *dev)
 868 {
 869         struct uart_port *port;
 870         int num, i, retval;
 871
 872         num = siu_init_ports(dev);
 873         if (num <= 0)
 874                 return -ENODEV;
 875
 876         siu_uart_driver.nr = num;
 877         retval = uart_register_driver(&siu_uart_driver);
 878         if (retval)
 879                 return retval;
 880
 881         for (i = 0; i < num; i++) {
 882                 port = &siu_uart_ports[i];
 883                 port->ops = &siu_uart_ops;
 884                 port->dev = &dev->dev;
 885
 886                 retval = uart_add_one_port(&siu_uart_driver, port);
 887                 if (retval < 0) {
 888                         port->dev = NULL;
 889                         break;
 890                 }
 891         }
 892
 893         if (i == 0 && retval < 0) {
 894                 uart_unregister_driver(&siu_uart_driver);
 895                 return retval;
 896         }
 897
 898         return 0;
 899 }
 900
 901 static int siu_remove(struct platform_device *dev)
 902 {
 903         struct uart_port *port;
 904         int i;
 905
 906         for (i = 0; i < siu_uart_driver.nr; i++) {
 907                 port = &siu_uart_ports[i];
 908                 if (port->dev == &dev->dev) {
 909                         uart_remove_one_port(&siu_uart_driver, port);
 910                         port->dev = NULL;
 911                 }
 912         }
 913
 914         uart_unregister_driver(&siu_uart_driver);
 915
 916         return 0;
 917 }
 918
 919 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 920 {
 921         struct uart_port *port;
 922         int i;
 923
 924         for (i = 0; i < siu_uart_driver.nr; i++) {
 925                 port = &siu_uart_ports[i];
 926                 if ((port->type == PORT_VR41XX_SIU ||
 927                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 928                         uart_suspend_port(&siu_uart_driver, port);
 929
 930         }
 931
 932         return 0;
 933 }
 934
 935 static int siu_resume(struct platform_device *dev)
 936 {
 937         struct uart_port *port;
 938         int i;
 939
 940         for (i = 0; i < siu_uart_driver.nr; i++) {
 941                 port = &siu_uart_ports[i];
 942                 if ((port->type == PORT_VR41XX_SIU ||
 943                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 944                         uart_resume_port(&siu_uart_driver, port);
 945         }
 946
 947         return 0;
 948 }
 949
 950 static struct platform_driver siu_device_driver = {
 951         .probe          = siu_probe,
 952         .remove         = siu_remove,
 953         .suspend        = siu_suspend,
 954         .resume         = siu_resume,
 955         .driver         = {
 956                 .name   = "SIU",
 957         },
 958 };
 959
 960 module_platform_driver(siu_device_driver);
 961
 962 MODULE_LICENSE("GPL");
 963 MODULE_ALIAS("platform:SIU");