drivers/serial/vr41xx_siu.c

   1 /*
   2  *  Driver for NEC VR4100 series Serial Interface Unit.
   3  *
   4  *  Copyright (C) 2004-2005  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/platform_device.h>
  29 #include <linux/err.h>
  30 #include <linux/ioport.h>
  31 #include <linux/init.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/module.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/irq.h>
  42 #include <asm/vr41xx/siu.h>
  43 #include <asm/vr41xx/vr41xx.h>
  44
  45 #define SIU_PORTS_MAX   2
  46 #define SIU_BAUD_BASE   1152000
  47 #define SIU_MAJOR       204
  48 #define SIU_MINOR_BASE  82
  49
  50 #define RX_MAX_COUNT    256
  51 #define TX_MAX_COUNT    15
  52
  53 #define SIUIRSEL        0x08
  54  #define TMICMODE       0x20
  55  #define TMICTX         0x10
  56  #define IRMSEL         0x0c
  57  #define IRMSEL_HP      0x08
  58  #define IRMSEL_TEMIC   0x04
  59  #define IRMSEL_SHARP   0x00
  60  #define IRUSESEL       0x02
  61  #define SIRSEL         0x01
  62
  63 struct siu_port {
  64         unsigned int type;
  65         unsigned int irq;
  66         unsigned long start;
  67 };
  68
  69 static const struct siu_port siu_type1_ports[] = {
  70         {       .type           = PORT_VR41XX_SIU,
  71                 .irq            = SIU_IRQ,
  72                 .start          = 0x0c000000UL,         },
  73 };
  74
  75 #define SIU_TYPE1_NR_PORTS      (sizeof(siu_type1_ports) / sizeof(struct siu_port))
  76
  77 static const struct siu_port siu_type2_ports[] = {
  78         {       .type           = PORT_VR41XX_SIU,
  79                 .irq            = SIU_IRQ,
  80                 .start          = 0x0f000800UL,         },
  81         {       .type           = PORT_VR41XX_DSIU,
  82                 .irq            = DSIU_IRQ,
  83                 .start          = 0x0f000820UL,         },
  84 };
  85
  86 #define SIU_TYPE2_NR_PORTS      (sizeof(siu_type2_ports) / sizeof(struct siu_port))
  87
  88 static struct uart_port siu_uart_ports[SIU_PORTS_MAX];
  89 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
  90
  91 #define siu_read(port, offset)          readb((port)->membase + (offset))
  92 #define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
  93
  94 void vr41xx_select_siu_interface(siu_interface_t interface)
  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 (interface == SIU_INTERFACE_IRDA)
 106                 irsel |= SIRSEL;
 107         else
 108                 irsel &= ~SIRSEL;
 109         siu_write(port, SIUIRSEL, irsel);
 110
 111         spin_unlock_irqrestore(&port->lock, flags);
 112 }
 113
 114 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
 115
 116 void vr41xx_use_irda(irda_use_t use)
 117 {
 118         struct uart_port *port;
 119         unsigned long flags;
 120         uint8_t irsel;
 121
 122         port = &siu_uart_ports[0];
 123
 124         spin_lock_irqsave(&port->lock, flags);
 125
 126         irsel = siu_read(port, SIUIRSEL);
 127         if (use == FIR_USE_IRDA)
 128                 irsel |= IRUSESEL;
 129         else
 130                 irsel &= ~IRUSESEL;
 131         siu_write(port, SIUIRSEL, irsel);
 132
 133         spin_unlock_irqrestore(&port->lock, flags);
 134 }
 135
 136 EXPORT_SYMBOL_GPL(vr41xx_use_irda);
 137
 138 void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
 139 {
 140         struct uart_port *port;
 141         unsigned long flags;
 142         uint8_t irsel;
 143
 144         port = &siu_uart_ports[0];
 145
 146         spin_lock_irqsave(&port->lock, flags);
 147
 148         irsel = siu_read(port, SIUIRSEL);
 149         irsel &= ~(IRMSEL | TMICTX | TMICMODE);
 150         switch (module) {
 151         case SHARP_IRDA:
 152                 irsel |= IRMSEL_SHARP;
 153                 break;
 154         case TEMIC_IRDA:
 155                 irsel |= IRMSEL_TEMIC | TMICMODE;
 156                 if (speed == IRDA_TX_4MBPS)
 157                         irsel |= TMICTX;
 158                 break;
 159         case HP_IRDA:
 160                 irsel |= IRMSEL_HP;
 161                 break;
 162         default:
 163                 break;
 164         }
 165         siu_write(port, SIUIRSEL, irsel);
 166
 167         spin_unlock_irqrestore(&port->lock, flags);
 168 }
 169
 170 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
 171
 172 static inline void siu_clear_fifo(struct uart_port *port)
 173 {
 174         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
 175         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 176                                   UART_FCR_CLEAR_XMIT);
 177         siu_write(port, UART_FCR, 0);
 178 }
 179
 180 static inline int siu_probe_ports(void)
 181 {
 182         switch (current_cpu_data.cputype) {
 183         case CPU_VR4111:
 184         case CPU_VR4121:
 185                 return SIU_TYPE1_NR_PORTS;
 186         case CPU_VR4122:
 187         case CPU_VR4131:
 188         case CPU_VR4133:
 189                 return SIU_TYPE2_NR_PORTS;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static inline unsigned long siu_port_size(struct uart_port *port)
 196 {
 197         switch (port->type) {
 198         case PORT_VR41XX_SIU:
 199                 return 11UL;
 200         case PORT_VR41XX_DSIU:
 201                 return 8UL;
 202         }
 203
 204         return 0;
 205 }
 206
 207 static inline unsigned int siu_check_type(struct uart_port *port)
 208 {
 209         switch (current_cpu_data.cputype) {
 210         case CPU_VR4111:
 211         case CPU_VR4121:
 212                 if (port->line == 0)
 213                         return PORT_VR41XX_SIU;
 214                 break;
 215         case CPU_VR4122:
 216         case CPU_VR4131:
 217         case CPU_VR4133:
 218                 if (port->line == 0)
 219                         return PORT_VR41XX_SIU;
 220                 else if (port->line == 1)
 221                         return PORT_VR41XX_DSIU;
 222                 break;
 223         }
 224
 225         return PORT_UNKNOWN;
 226 }
 227
 228 static inline const char *siu_type_name(struct uart_port *port)
 229 {
 230         switch (port->type) {
 231         case PORT_VR41XX_SIU:
 232                 return "SIU";
 233         case PORT_VR41XX_DSIU:
 234                 return "DSIU";
 235         }
 236
 237         return NULL;
 238 }
 239
 240 static unsigned int siu_tx_empty(struct uart_port *port)
 241 {
 242         uint8_t lsr;
 243
 244         lsr = siu_read(port, UART_LSR);
 245         if (lsr & UART_LSR_TEMT)
 246                 return TIOCSER_TEMT;
 247
 248         return 0;
 249 }
 250
 251 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 252 {
 253         uint8_t mcr = 0;
 254
 255         if (mctrl & TIOCM_DTR)
 256                 mcr |= UART_MCR_DTR;
 257         if (mctrl & TIOCM_RTS)
 258                 mcr |= UART_MCR_RTS;
 259         if (mctrl & TIOCM_OUT1)
 260                 mcr |= UART_MCR_OUT1;
 261         if (mctrl & TIOCM_OUT2)
 262                 mcr |= UART_MCR_OUT2;
 263         if (mctrl & TIOCM_LOOP)
 264                 mcr |= UART_MCR_LOOP;
 265
 266         siu_write(port, UART_MCR, mcr);
 267 }
 268
 269 static unsigned int siu_get_mctrl(struct uart_port *port)
 270 {
 271         uint8_t msr;
 272         unsigned int mctrl = 0;
 273
 274         msr = siu_read(port, UART_MSR);
 275         if (msr & UART_MSR_DCD)
 276                 mctrl |= TIOCM_CAR;
 277         if (msr & UART_MSR_RI)
 278                 mctrl |= TIOCM_RNG;
 279         if (msr & UART_MSR_DSR)
 280                 mctrl |= TIOCM_DSR;
 281         if (msr & UART_MSR_CTS)
 282                 mctrl |= TIOCM_CTS;
 283
 284         return mctrl;
 285 }
 286
 287 static void siu_stop_tx(struct uart_port *port)
 288 {
 289         unsigned long flags;
 290         uint8_t ier;
 291
 292         spin_lock_irqsave(&port->lock, flags);
 293
 294         ier = siu_read(port, UART_IER);
 295         ier &= ~UART_IER_THRI;
 296         siu_write(port, UART_IER, ier);
 297
 298         spin_unlock_irqrestore(&port->lock, flags);
 299 }
 300
 301 static void siu_start_tx(struct uart_port *port)
 302 {
 303         unsigned long flags;
 304         uint8_t ier;
 305
 306         spin_lock_irqsave(&port->lock, flags);
 307
 308         ier = siu_read(port, UART_IER);
 309         ier |= UART_IER_THRI;
 310         siu_write(port, UART_IER, ier);
 311
 312         spin_unlock_irqrestore(&port->lock, flags);
 313 }
 314
 315 static void siu_stop_rx(struct uart_port *port)
 316 {
 317         unsigned long flags;
 318         uint8_t ier;
 319
 320         spin_lock_irqsave(&port->lock, flags);
 321
 322         ier = siu_read(port, UART_IER);
 323         ier &= ~UART_IER_RLSI;
 324         siu_write(port, UART_IER, ier);
 325
 326         port->read_status_mask &= ~UART_LSR_DR;
 327
 328         spin_unlock_irqrestore(&port->lock, flags);
 329 }
 330
 331 static void siu_enable_ms(struct uart_port *port)
 332 {
 333         unsigned long flags;
 334         uint8_t ier;
 335
 336         spin_lock_irqsave(&port->lock, flags);
 337
 338         ier = siu_read(port, UART_IER);
 339         ier |= UART_IER_MSI;
 340         siu_write(port, UART_IER, ier);
 341
 342         spin_unlock_irqrestore(&port->lock, flags);
 343 }
 344
 345 static void siu_break_ctl(struct uart_port *port, int ctl)
 346 {
 347         unsigned long flags;
 348         uint8_t lcr;
 349
 350         spin_lock_irqsave(&port->lock, flags);
 351
 352         lcr = siu_read(port, UART_LCR);
 353         if (ctl == -1)
 354                 lcr |= UART_LCR_SBC;
 355         else
 356                 lcr &= ~UART_LCR_SBC;
 357         siu_write(port, UART_LCR, lcr);
 358
 359         spin_unlock_irqrestore(&port->lock, flags);
 360 }
 361
 362 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 363 {
 364         struct tty_struct *tty;
 365         uint8_t lsr, ch;
 366         char flag;
 367         int max_count = RX_MAX_COUNT;
 368
 369         tty = port->info->tty;
 370         lsr = *status;
 371
 372         do {
 373                 ch = siu_read(port, UART_RX);
 374                 port->icount.rx++;
 375                 flag = TTY_NORMAL;
 376
 377 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 378                 lsr |= lsr_break_flag[port->line];
 379                 lsr_break_flag[port->line] = 0;
 380 #endif
 381                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
 382                                     UART_LSR_PE | UART_LSR_OE))) {
 383                         if (lsr & UART_LSR_BI) {
 384                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 385                                 port->icount.brk++;
 386
 387                                 if (uart_handle_break(port))
 388                                         goto ignore_char;
 389                         }
 390
 391                         if (lsr & UART_LSR_FE)
 392                                 port->icount.frame++;
 393                         if (lsr & UART_LSR_PE)
 394                                 port->icount.parity++;
 395                         if (lsr & UART_LSR_OE)
 396                                 port->icount.overrun++;
 397
 398                         lsr &= port->read_status_mask;
 399                         if (lsr & UART_LSR_BI)
 400                                 flag = TTY_BREAK;
 401                         if (lsr & UART_LSR_FE)
 402                                 flag = TTY_FRAME;
 403                         if (lsr & UART_LSR_PE)
 404                                 flag = TTY_PARITY;
 405                 }
 406
 407                 if (uart_handle_sysrq_char(port, ch))
 408                         goto ignore_char;
 409
 410                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
 411
 412         ignore_char:
 413                 lsr = siu_read(port, UART_LSR);
 414         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 415
 416         tty_flip_buffer_push(tty);
 417
 418         *status = lsr;
 419 }
 420
 421 static inline void check_modem_status(struct uart_port *port)
 422 {
 423         uint8_t msr;
 424
 425         msr = siu_read(port, UART_MSR);
 426         if ((msr & UART_MSR_ANY_DELTA) == 0)
 427                 return;
 428         if (msr & UART_MSR_DDCD)
 429                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
 430         if (msr & UART_MSR_TERI)
 431                 port->icount.rng++;
 432         if (msr & UART_MSR_DDSR)
 433                 port->icount.dsr++;
 434         if (msr & UART_MSR_DCTS)
 435                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
 436
 437         wake_up_interruptible(&port->info->delta_msr_wait);
 438 }
 439
 440 static inline void transmit_chars(struct uart_port *port)
 441 {
 442         struct circ_buf *xmit;
 443         int max_count = TX_MAX_COUNT;
 444
 445         xmit = &port->info->xmit;
 446
 447         if (port->x_char) {
 448                 siu_write(port, UART_TX, port->x_char);
 449                 port->icount.tx++;
 450                 port->x_char = 0;
 451                 return;
 452         }
 453
 454         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 455                 siu_stop_tx(port);
 456                 return;
 457         }
 458
 459         do {
 460                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
 461                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 462                 port->icount.tx++;
 463                 if (uart_circ_empty(xmit))
 464                         break;
 465         } while (max_count-- > 0);
 466
 467         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 468                 uart_write_wakeup(port);
 469
 470         if (uart_circ_empty(xmit))
 471                 siu_stop_tx(port);
 472 }
 473
 474 static irqreturn_t siu_interrupt(int irq, void *dev_id)
 475 {
 476         struct uart_port *port;
 477         uint8_t iir, lsr;
 478
 479         port = (struct uart_port *)dev_id;
 480
 481         iir = siu_read(port, UART_IIR);
 482         if (iir & UART_IIR_NO_INT)
 483                 return IRQ_NONE;
 484
 485         lsr = siu_read(port, UART_LSR);
 486         if (lsr & UART_LSR_DR)
 487                 receive_chars(port, &lsr);
 488
 489         check_modem_status(port);
 490
 491         if (lsr & UART_LSR_THRE)
 492                 transmit_chars(port);
 493
 494         return IRQ_HANDLED;
 495 }
 496
 497 static int siu_startup(struct uart_port *port)
 498 {
 499         int retval;
 500
 501         if (port->membase == NULL)
 502                 return -ENODEV;
 503
 504         siu_clear_fifo(port);
 505
 506         (void)siu_read(port, UART_LSR);
 507         (void)siu_read(port, UART_RX);
 508         (void)siu_read(port, UART_IIR);
 509         (void)siu_read(port, UART_MSR);
 510
 511         if (siu_read(port, UART_LSR) == 0xff)
 512                 return -ENODEV;
 513
 514         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
 515         if (retval)
 516                 return retval;
 517
 518         if (port->type == PORT_VR41XX_DSIU)
 519                 vr41xx_enable_dsiuint(DSIUINT_ALL);
 520
 521         siu_write(port, UART_LCR, UART_LCR_WLEN8);
 522
 523         spin_lock_irq(&port->lock);
 524         siu_set_mctrl(port, port->mctrl);
 525         spin_unlock_irq(&port->lock);
 526
 527         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
 528
 529         (void)siu_read(port, UART_LSR);
 530         (void)siu_read(port, UART_RX);
 531         (void)siu_read(port, UART_IIR);
 532         (void)siu_read(port, UART_MSR);
 533
 534         return 0;
 535 }
 536
 537 static void siu_shutdown(struct uart_port *port)
 538 {
 539         unsigned long flags;
 540         uint8_t lcr;
 541
 542         siu_write(port, UART_IER, 0);
 543
 544         spin_lock_irqsave(&port->lock, flags);
 545
 546         port->mctrl &= ~TIOCM_OUT2;
 547         siu_set_mctrl(port, port->mctrl);
 548
 549         spin_unlock_irqrestore(&port->lock, flags);
 550
 551         lcr = siu_read(port, UART_LCR);
 552         lcr &= ~UART_LCR_SBC;
 553         siu_write(port, UART_LCR, lcr);
 554
 555         siu_clear_fifo(port);
 556
 557         (void)siu_read(port, UART_RX);
 558
 559         if (port->type == PORT_VR41XX_DSIU)
 560                 vr41xx_disable_dsiuint(DSIUINT_ALL);
 561
 562         free_irq(port->irq, port);
 563 }
 564
 565 static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 566                             struct ktermios *old)
 567 {
 568         tcflag_t c_cflag, c_iflag;
 569         uint8_t lcr, fcr, ier;
 570         unsigned int baud, quot;
 571         unsigned long flags;
 572
 573         c_cflag = new->c_cflag;
 574         switch (c_cflag & CSIZE) {
 575         case CS5:
 576                 lcr = UART_LCR_WLEN5;
 577                 break;
 578         case CS6:
 579                 lcr = UART_LCR_WLEN6;
 580                 break;
 581         case CS7:
 582                 lcr = UART_LCR_WLEN7;
 583                 break;
 584         default:
 585                 lcr = UART_LCR_WLEN8;
 586                 break;
 587         }
 588
 589         if (c_cflag & CSTOPB)
 590                 lcr |= UART_LCR_STOP;
 591         if (c_cflag & PARENB)
 592                 lcr |= UART_LCR_PARITY;
 593         if ((c_cflag & PARODD) != PARODD)
 594                 lcr |= UART_LCR_EPAR;
 595         if (c_cflag & CMSPAR)
 596                 lcr |= UART_LCR_SPAR;
 597
 598         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
 599         quot = uart_get_divisor(port, baud);
 600
 601         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
 602
 603         spin_lock_irqsave(&port->lock, flags);
 604
 605         uart_update_timeout(port, c_cflag, baud);
 606
 607         c_iflag = new->c_iflag;
 608
 609         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
 610         if (c_iflag & INPCK)
 611                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 612         if (c_iflag & (BRKINT | PARMRK))
 613                 port->read_status_mask |= UART_LSR_BI;
 614
 615         port->ignore_status_mask = 0;
 616         if (c_iflag & IGNPAR)
 617                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
 618         if (c_iflag & IGNBRK) {
 619                 port->ignore_status_mask |= UART_LSR_BI;
 620                 if (c_iflag & IGNPAR)
 621                         port->ignore_status_mask |= UART_LSR_OE;
 622         }
 623
 624         if ((c_cflag & CREAD) == 0)
 625                 port->ignore_status_mask |= UART_LSR_DR;
 626
 627         ier = siu_read(port, UART_IER);
 628         ier &= ~UART_IER_MSI;
 629         if (UART_ENABLE_MS(port, c_cflag))
 630                 ier |= UART_IER_MSI;
 631         siu_write(port, UART_IER, ier);
 632
 633         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
 634
 635         siu_write(port, UART_DLL, (uint8_t)quot);
 636         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
 637
 638         siu_write(port, UART_LCR, lcr);
 639
 640         siu_write(port, UART_FCR, fcr);
 641
 642         siu_set_mctrl(port, port->mctrl);
 643
 644         spin_unlock_irqrestore(&port->lock, flags);
 645 }
 646
 647 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
 648 {
 649         switch (state) {
 650         case 0:
 651                 switch (port->type) {
 652                 case PORT_VR41XX_SIU:
 653                         vr41xx_supply_clock(SIU_CLOCK);
 654                         break;
 655                 case PORT_VR41XX_DSIU:
 656                         vr41xx_supply_clock(DSIU_CLOCK);
 657                         break;
 658                 }
 659                 break;
 660         case 3:
 661                 switch (port->type) {
 662                 case PORT_VR41XX_SIU:
 663                         vr41xx_mask_clock(SIU_CLOCK);
 664                         break;
 665                 case PORT_VR41XX_DSIU:
 666                         vr41xx_mask_clock(DSIU_CLOCK);
 667                         break;
 668                 }
 669                 break;
 670         }
 671 }
 672
 673 static const char *siu_type(struct uart_port *port)
 674 {
 675         return siu_type_name(port);
 676 }
 677
 678 static void siu_release_port(struct uart_port *port)
 679 {
 680         unsigned long size;
 681
 682         if (port->flags & UPF_IOREMAP) {
 683                 iounmap(port->membase);
 684                 port->membase = NULL;
 685         }
 686
 687         size = siu_port_size(port);
 688         release_mem_region(port->mapbase, size);
 689 }
 690
 691 static int siu_request_port(struct uart_port *port)
 692 {
 693         unsigned long size;
 694         struct resource *res;
 695
 696         size = siu_port_size(port);
 697         res = request_mem_region(port->mapbase, size, siu_type_name(port));
 698         if (res == NULL)
 699                 return -EBUSY;
 700
 701         if (port->flags & UPF_IOREMAP) {
 702                 port->membase = ioremap(port->mapbase, size);
 703                 if (port->membase == NULL) {
 704                         release_resource(res);
 705                         return -ENOMEM;
 706                 }
 707         }
 708
 709         return 0;
 710 }
 711
 712 static void siu_config_port(struct uart_port *port, int flags)
 713 {
 714         if (flags & UART_CONFIG_TYPE) {
 715                 port->type = siu_check_type(port);
 716                 (void)siu_request_port(port);
 717         }
 718 }
 719
 720 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
 721 {
 722         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
 723                 return -EINVAL;
 724         if (port->irq != serial->irq)
 725                 return -EINVAL;
 726         if (port->iotype != serial->io_type)
 727                 return -EINVAL;
 728         if (port->mapbase != (unsigned long)serial->iomem_base)
 729                 return -EINVAL;
 730
 731         return 0;
 732 }
 733
 734 static struct uart_ops siu_uart_ops = {
 735         .tx_empty       = siu_tx_empty,
 736         .set_mctrl      = siu_set_mctrl,
 737         .get_mctrl      = siu_get_mctrl,
 738         .stop_tx        = siu_stop_tx,
 739         .start_tx       = siu_start_tx,
 740         .stop_rx        = siu_stop_rx,
 741         .enable_ms      = siu_enable_ms,
 742         .break_ctl      = siu_break_ctl,
 743         .startup        = siu_startup,
 744         .shutdown       = siu_shutdown,
 745         .set_termios    = siu_set_termios,
 746         .pm             = siu_pm,
 747         .type           = siu_type,
 748         .release_port   = siu_release_port,
 749         .request_port   = siu_request_port,
 750         .config_port    = siu_config_port,
 751         .verify_port    = siu_verify_port,
 752 };
 753
 754 static int siu_init_ports(void)
 755 {
 756         const struct siu_port *siu;
 757         struct uart_port *port;
 758         int i, num;
 759
 760         switch (current_cpu_data.cputype) {
 761         case CPU_VR4111:
 762         case CPU_VR4121:
 763                 siu = siu_type1_ports;
 764                 break;
 765         case CPU_VR4122:
 766         case CPU_VR4131:
 767         case CPU_VR4133:
 768                 siu = siu_type2_ports;
 769                 break;
 770         default:
 771                 return 0;
 772         }
 773
 774         port = siu_uart_ports;
 775         num = siu_probe_ports();
 776         for (i = 0; i < num; i++) {
 777                 spin_lock_init(&port->lock);
 778                 port->irq = siu->irq;
 779                 port->uartclk = SIU_BAUD_BASE * 16;
 780                 port->fifosize = 16;
 781                 port->regshift = 0;
 782                 port->iotype = UPIO_MEM;
 783                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 784                 port->type = siu->type;
 785                 port->line = i;
 786                 port->mapbase = siu->start;
 787                 siu++;
 788                 port++;
 789         }
 790
 791         return num;
 792 }
 793
 794 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 795
 796 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 797
 798 static void wait_for_xmitr(struct uart_port *port)
 799 {
 800         int timeout = 10000;
 801         uint8_t lsr, msr;
 802
 803         do {
 804                 lsr = siu_read(port, UART_LSR);
 805                 if (lsr & UART_LSR_BI)
 806                         lsr_break_flag[port->line] = UART_LSR_BI;
 807
 808                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
 809                         break;
 810         } while (timeout-- > 0);
 811
 812         if (port->flags & UPF_CONS_FLOW) {
 813                 timeout = 1000000;
 814
 815                 do {
 816                         msr = siu_read(port, UART_MSR);
 817                         if ((msr & UART_MSR_CTS) != 0)
 818                                 break;
 819                 } while (timeout-- > 0);
 820         }
 821 }
 822
 823 static void siu_console_putchar(struct uart_port *port, int ch)
 824 {
 825         wait_for_xmitr(port);
 826         siu_write(port, UART_TX, ch);
 827 }
 828
 829 static void siu_console_write(struct console *con, const char *s, unsigned count)
 830 {
 831         struct uart_port *port;
 832         uint8_t ier;
 833
 834         port = &siu_uart_ports[con->index];
 835
 836         ier = siu_read(port, UART_IER);
 837         siu_write(port, UART_IER, 0);
 838
 839         uart_console_write(port, s, count, siu_console_putchar);
 840
 841         wait_for_xmitr(port);
 842         siu_write(port, UART_IER, ier);
 843 }
 844
 845 static int siu_console_setup(struct console *con, char *options)
 846 {
 847         struct uart_port *port;
 848         int baud = 9600;
 849         int parity = 'n';
 850         int bits = 8;
 851         int flow = 'n';
 852
 853         if (con->index >= SIU_PORTS_MAX)
 854                 con->index = 0;
 855
 856         port = &siu_uart_ports[con->index];
 857         if (port->membase == NULL) {
 858                 if (port->mapbase == 0)
 859                         return -ENODEV;
 860                 port->membase = ioremap(port->mapbase, siu_port_size(port));
 861         }
 862
 863         vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 864
 865         if (options != NULL)
 866                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 867
 868         return uart_set_options(port, con, baud, parity, bits, flow);
 869 }
 870
 871 static struct uart_driver siu_uart_driver;
 872
 873 static struct console siu_console = {
 874         .name   = "ttyVR",
 875         .write  = siu_console_write,
 876         .device = uart_console_device,
 877         .setup  = siu_console_setup,
 878         .flags  = CON_PRINTBUFFER,
 879         .index  = -1,
 880         .data   = &siu_uart_driver,
 881 };
 882
 883 static int __devinit siu_console_init(void)
 884 {
 885         struct uart_port *port;
 886         int num, i;
 887
 888         num = siu_init_ports();
 889         if (num <= 0)
 890                 return -ENODEV;
 891
 892         for (i = 0; i < num; i++) {
 893                 port = &siu_uart_ports[i];
 894                 port->ops = &siu_uart_ops;
 895         }
 896
 897         register_console(&siu_console);
 898
 899         return 0;
 900 }
 901
 902 console_initcall(siu_console_init);
 903
 904 #define SERIAL_VR41XX_CONSOLE   &siu_console
 905 #else
 906 #define SERIAL_VR41XX_CONSOLE   NULL
 907 #endif
 908
 909 static struct uart_driver siu_uart_driver = {
 910         .owner          = THIS_MODULE,
 911         .driver_name    = "SIU",
 912         .dev_name       = "ttyVR",
 913         .major          = SIU_MAJOR,
 914         .minor          = SIU_MINOR_BASE,
 915         .cons           = SERIAL_VR41XX_CONSOLE,
 916 };
 917
 918 static int __devinit siu_probe(struct platform_device *dev)
 919 {
 920         struct uart_port *port;
 921         int num, i, retval;
 922
 923         num = siu_init_ports();
 924         if (num <= 0)
 925                 return -ENODEV;
 926
 927         siu_uart_driver.nr = num;
 928         retval = uart_register_driver(&siu_uart_driver);
 929         if (retval)
 930                 return retval;
 931
 932         for (i = 0; i < num; i++) {
 933                 port = &siu_uart_ports[i];
 934                 port->ops = &siu_uart_ops;
 935                 port->dev = &dev->dev;
 936
 937                 retval = uart_add_one_port(&siu_uart_driver, port);
 938                 if (retval < 0) {
 939                         port->dev = NULL;
 940                         break;
 941                 }
 942         }
 943
 944         if (i == 0 && retval < 0) {
 945                 uart_unregister_driver(&siu_uart_driver);
 946                 return retval;
 947         }
 948
 949         return 0;
 950 }
 951
 952 static int __devexit siu_remove(struct platform_device *dev)
 953 {
 954         struct uart_port *port;
 955         int i;
 956
 957         for (i = 0; i < siu_uart_driver.nr; i++) {
 958                 port = &siu_uart_ports[i];
 959                 if (port->dev == &dev->dev) {
 960                         uart_remove_one_port(&siu_uart_driver, port);
 961                         port->dev = NULL;
 962                 }
 963         }
 964
 965         uart_unregister_driver(&siu_uart_driver);
 966
 967         return 0;
 968 }
 969
 970 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 971 {
 972         struct uart_port *port;
 973         int i;
 974
 975         for (i = 0; i < siu_uart_driver.nr; i++) {
 976                 port = &siu_uart_ports[i];
 977                 if ((port->type == PORT_VR41XX_SIU ||
 978                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 979                         uart_suspend_port(&siu_uart_driver, port);
 980
 981         }
 982
 983         return 0;
 984 }
 985
 986 static int siu_resume(struct platform_device *dev)
 987 {
 988         struct uart_port *port;
 989         int i;
 990
 991         for (i = 0; i < siu_uart_driver.nr; i++) {
 992                 port = &siu_uart_ports[i];
 993                 if ((port->type == PORT_VR41XX_SIU ||
 994                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 995                         uart_resume_port(&siu_uart_driver, port);
 996         }
 997
 998         return 0;
 999 }
1000
1001 static struct platform_device *siu_platform_device;
1002
1003 static struct platform_driver siu_device_driver = {
1004         .probe          = siu_probe,
1005         .remove         = __devexit_p(siu_remove),
1006         .suspend        = siu_suspend,
1007         .resume         = siu_resume,
1008         .driver         = {
1009                 .name   = "SIU",
1010                 .owner  = THIS_MODULE,
1011         },
1012 };
1013
1014 static int __init vr41xx_siu_init(void)
1015 {
1016         int retval;
1017
1018         siu_platform_device = platform_device_alloc("SIU", -1);
1019         if (!siu_platform_device)
1020                 return -ENOMEM;
1021
1022         retval = platform_device_add(siu_platform_device);
1023         if (retval < 0) {
1024                 platform_device_put(siu_platform_device);
1025                 return retval;
1026         }
1027
1028         retval = platform_driver_register(&siu_device_driver);
1029         if (retval < 0)
1030                 platform_device_unregister(siu_platform_device);
1031
1032         return retval;
1033 }
1034
1035 static void __exit vr41xx_siu_exit(void)
1036 {
1037         platform_driver_unregister(&siu_device_driver);
1038         platform_device_unregister(siu_platform_device);
1039 }
1040
1041 module_init(vr41xx_siu_init);
1042 module_exit(vr41xx_siu_exit);