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 #include <linux/config.h>
  23
  24 #if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  25 #define SUPPORT_SYSRQ
  26 #endif
  27
  28 #include <linux/console.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/err.h>
  31 #include <linux/ioport.h>
  32 #include <linux/init.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/module.h>
  35 #include <linux/serial.h>
  36 #include <linux/serial_core.h>
  37 #include <linux/serial_reg.h>
  38 #include <linux/tty.h>
  39 #include <linux/tty_flip.h>
  40
  41 #include <asm/io.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                                  struct pt_regs *regs)
 364 {
 365         struct tty_struct *tty;
 366         uint8_t lsr, ch;
 367         char flag;
 368         int max_count = RX_MAX_COUNT;
 369
 370         tty = port->info->tty;
 371         lsr = *status;
 372
 373         do {
 374                 ch = siu_read(port, UART_RX);
 375                 port->icount.rx++;
 376                 flag = TTY_NORMAL;
 377
 378 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 379                 lsr |= lsr_break_flag[port->line];
 380                 lsr_break_flag[port->line] = 0;
 381 #endif
 382                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
 383                                     UART_LSR_PE | UART_LSR_OE))) {
 384                         if (lsr & UART_LSR_BI) {
 385                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 386                                 port->icount.brk++;
 387
 388                                 if (uart_handle_break(port))
 389                                         goto ignore_char;
 390                         }
 391
 392                         if (lsr & UART_LSR_FE)
 393                                 port->icount.frame++;
 394                         if (lsr & UART_LSR_PE)
 395                                 port->icount.parity++;
 396                         if (lsr & UART_LSR_OE)
 397                                 port->icount.overrun++;
 398
 399                         lsr &= port->read_status_mask;
 400                         if (lsr & UART_LSR_BI)
 401                                 flag = TTY_BREAK;
 402                         if (lsr & UART_LSR_FE)
 403                                 flag = TTY_FRAME;
 404                         if (lsr & UART_LSR_PE)
 405                                 flag = TTY_PARITY;
 406                 }
 407
 408                 if (uart_handle_sysrq_char(port, ch, regs))
 409                         goto ignore_char;
 410
 411                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
 412
 413         ignore_char:
 414                 lsr = siu_read(port, UART_LSR);
 415         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 416
 417         tty_flip_buffer_push(tty);
 418
 419         *status = lsr;
 420 }
 421
 422 static inline void check_modem_status(struct uart_port *port)
 423 {
 424         uint8_t msr;
 425
 426         msr = siu_read(port, UART_MSR);
 427         if ((msr & UART_MSR_ANY_DELTA) == 0)
 428                 return;
 429         if (msr & UART_MSR_DDCD)
 430                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
 431         if (msr & UART_MSR_TERI)
 432                 port->icount.rng++;
 433         if (msr & UART_MSR_DDSR)
 434                 port->icount.dsr++;
 435         if (msr & UART_MSR_DCTS)
 436                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
 437
 438         wake_up_interruptible(&port->info->delta_msr_wait);
 439 }
 440
 441 static inline void transmit_chars(struct uart_port *port)
 442 {
 443         struct circ_buf *xmit;
 444         int max_count = TX_MAX_COUNT;
 445
 446         xmit = &port->info->xmit;
 447
 448         if (port->x_char) {
 449                 siu_write(port, UART_TX, port->x_char);
 450                 port->icount.tx++;
 451                 port->x_char = 0;
 452                 return;
 453         }
 454
 455         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 456                 siu_stop_tx(port);
 457                 return;
 458         }
 459
 460         do {
 461                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
 462                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 463                 port->icount.tx++;
 464                 if (uart_circ_empty(xmit))
 465                         break;
 466         } while (max_count-- > 0);
 467
 468         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 469                 uart_write_wakeup(port);
 470
 471         if (uart_circ_empty(xmit))
 472                 siu_stop_tx(port);
 473 }
 474
 475 static irqreturn_t siu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 476 {
 477         struct uart_port *port;
 478         uint8_t iir, lsr;
 479
 480         port = (struct uart_port *)dev_id;
 481
 482         iir = siu_read(port, UART_IIR);
 483         if (iir & UART_IIR_NO_INT)
 484                 return IRQ_NONE;
 485
 486         lsr = siu_read(port, UART_LSR);
 487         if (lsr & UART_LSR_DR)
 488                 receive_chars(port, &lsr, regs);
 489
 490         check_modem_status(port);
 491
 492         if (lsr & UART_LSR_THRE)
 493                 transmit_chars(port);
 494
 495         return IRQ_HANDLED;
 496 }
 497
 498 static int siu_startup(struct uart_port *port)
 499 {
 500         int retval;
 501
 502         if (port->membase == NULL)
 503                 return -ENODEV;
 504
 505         siu_clear_fifo(port);
 506
 507         (void)siu_read(port, UART_LSR);
 508         (void)siu_read(port, UART_RX);
 509         (void)siu_read(port, UART_IIR);
 510         (void)siu_read(port, UART_MSR);
 511
 512         if (siu_read(port, UART_LSR) == 0xff)
 513                 return -ENODEV;
 514
 515         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
 516         if (retval)
 517                 return retval;
 518
 519         if (port->type == PORT_VR41XX_DSIU)
 520                 vr41xx_enable_dsiuint(DSIUINT_ALL);
 521
 522         siu_write(port, UART_LCR, UART_LCR_WLEN8);
 523
 524         spin_lock_irq(&port->lock);
 525         siu_set_mctrl(port, port->mctrl);
 526         spin_unlock_irq(&port->lock);
 527
 528         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
 529
 530         (void)siu_read(port, UART_LSR);
 531         (void)siu_read(port, UART_RX);
 532         (void)siu_read(port, UART_IIR);
 533         (void)siu_read(port, UART_MSR);
 534
 535         return 0;
 536 }
 537
 538 static void siu_shutdown(struct uart_port *port)
 539 {
 540         unsigned long flags;
 541         uint8_t lcr;
 542
 543         siu_write(port, UART_IER, 0);
 544
 545         spin_lock_irqsave(&port->lock, flags);
 546
 547         port->mctrl &= ~TIOCM_OUT2;
 548         siu_set_mctrl(port, port->mctrl);
 549
 550         spin_unlock_irqrestore(&port->lock, flags);
 551
 552         lcr = siu_read(port, UART_LCR);
 553         lcr &= ~UART_LCR_SBC;
 554         siu_write(port, UART_LCR, lcr);
 555
 556         siu_clear_fifo(port);
 557
 558         (void)siu_read(port, UART_RX);
 559
 560         if (port->type == PORT_VR41XX_DSIU)
 561                 vr41xx_disable_dsiuint(DSIUINT_ALL);
 562
 563         free_irq(port->irq, port);
 564 }
 565
 566 static void siu_set_termios(struct uart_port *port, struct termios *new,
 567                             struct termios *old)
 568 {
 569         tcflag_t c_cflag, c_iflag;
 570         uint8_t lcr, fcr, ier;
 571         unsigned int baud, quot;
 572         unsigned long flags;
 573
 574         c_cflag = new->c_cflag;
 575         switch (c_cflag & CSIZE) {
 576         case CS5:
 577                 lcr = UART_LCR_WLEN5;
 578                 break;
 579         case CS6:
 580                 lcr = UART_LCR_WLEN6;
 581                 break;
 582         case CS7:
 583                 lcr = UART_LCR_WLEN7;
 584                 break;
 585         default:
 586                 lcr = UART_LCR_WLEN8;
 587                 break;
 588         }
 589
 590         if (c_cflag & CSTOPB)
 591                 lcr |= UART_LCR_STOP;
 592         if (c_cflag & PARENB)
 593                 lcr |= UART_LCR_PARITY;
 594         if ((c_cflag & PARODD) != PARODD)
 595                 lcr |= UART_LCR_EPAR;
 596         if (c_cflag & CMSPAR)
 597                 lcr |= UART_LCR_SPAR;
 598
 599         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
 600         quot = uart_get_divisor(port, baud);
 601
 602         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
 603
 604         spin_lock_irqsave(&port->lock, flags);
 605
 606         uart_update_timeout(port, c_cflag, baud);
 607
 608         c_iflag = new->c_iflag;
 609
 610         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
 611         if (c_iflag & INPCK)
 612                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 613         if (c_iflag & (BRKINT | PARMRK))
 614                 port->read_status_mask |= UART_LSR_BI;
 615
 616         port->ignore_status_mask = 0;
 617         if (c_iflag & IGNPAR)
 618                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
 619         if (c_iflag & IGNBRK) {
 620                 port->ignore_status_mask |= UART_LSR_BI;
 621                 if (c_iflag & IGNPAR)
 622                         port->ignore_status_mask |= UART_LSR_OE;
 623         }
 624
 625         if ((c_cflag & CREAD) == 0)
 626                 port->ignore_status_mask |= UART_LSR_DR;
 627
 628         ier = siu_read(port, UART_IER);
 629         ier &= ~UART_IER_MSI;
 630         if (UART_ENABLE_MS(port, c_cflag))
 631                 ier |= UART_IER_MSI;
 632         siu_write(port, UART_IER, ier);
 633
 634         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
 635
 636         siu_write(port, UART_DLL, (uint8_t)quot);
 637         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
 638
 639         siu_write(port, UART_LCR, lcr);
 640
 641         siu_write(port, UART_FCR, fcr);
 642
 643         siu_set_mctrl(port, port->mctrl);
 644
 645         spin_unlock_irqrestore(&port->lock, flags);
 646 }
 647
 648 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
 649 {
 650         switch (state) {
 651         case 0:
 652                 switch (port->type) {
 653                 case PORT_VR41XX_SIU:
 654                         vr41xx_supply_clock(SIU_CLOCK);
 655                         break;
 656                 case PORT_VR41XX_DSIU:
 657                         vr41xx_supply_clock(DSIU_CLOCK);
 658                         break;
 659                 }
 660                 break;
 661         case 3:
 662                 switch (port->type) {
 663                 case PORT_VR41XX_SIU:
 664                         vr41xx_mask_clock(SIU_CLOCK);
 665                         break;
 666                 case PORT_VR41XX_DSIU:
 667                         vr41xx_mask_clock(DSIU_CLOCK);
 668                         break;
 669                 }
 670                 break;
 671         }
 672 }
 673
 674 static const char *siu_type(struct uart_port *port)
 675 {
 676         return siu_type_name(port);
 677 }
 678
 679 static void siu_release_port(struct uart_port *port)
 680 {
 681         unsigned long size;
 682
 683         if (port->flags & UPF_IOREMAP) {
 684                 iounmap(port->membase);
 685                 port->membase = NULL;
 686         }
 687
 688         size = siu_port_size(port);
 689         release_mem_region(port->mapbase, size);
 690 }
 691
 692 static int siu_request_port(struct uart_port *port)
 693 {
 694         unsigned long size;
 695         struct resource *res;
 696
 697         size = siu_port_size(port);
 698         res = request_mem_region(port->mapbase, size, siu_type_name(port));
 699         if (res == NULL)
 700                 return -EBUSY;
 701
 702         if (port->flags & UPF_IOREMAP) {
 703                 port->membase = ioremap(port->mapbase, size);
 704                 if (port->membase == NULL) {
 705                         release_resource(res);
 706                         return -ENOMEM;
 707                 }
 708         }
 709
 710         return 0;
 711 }
 712
 713 static void siu_config_port(struct uart_port *port, int flags)
 714 {
 715         if (flags & UART_CONFIG_TYPE) {
 716                 port->type = siu_check_type(port);
 717                 (void)siu_request_port(port);
 718         }
 719 }
 720
 721 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
 722 {
 723         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
 724                 return -EINVAL;
 725         if (port->irq != serial->irq)
 726                 return -EINVAL;
 727         if (port->iotype != serial->io_type)
 728                 return -EINVAL;
 729         if (port->mapbase != (unsigned long)serial->iomem_base)
 730                 return -EINVAL;
 731
 732         return 0;
 733 }
 734
 735 static struct uart_ops siu_uart_ops = {
 736         .tx_empty       = siu_tx_empty,
 737         .set_mctrl      = siu_set_mctrl,
 738         .get_mctrl      = siu_get_mctrl,
 739         .stop_tx        = siu_stop_tx,
 740         .start_tx       = siu_start_tx,
 741         .stop_rx        = siu_stop_rx,
 742         .enable_ms      = siu_enable_ms,
 743         .break_ctl      = siu_break_ctl,
 744         .startup        = siu_startup,
 745         .shutdown       = siu_shutdown,
 746         .set_termios    = siu_set_termios,
 747         .pm             = siu_pm,
 748         .type           = siu_type,
 749         .release_port   = siu_release_port,
 750         .request_port   = siu_request_port,
 751         .config_port    = siu_config_port,
 752         .verify_port    = siu_verify_port,
 753 };
 754
 755 static int siu_init_ports(void)
 756 {
 757         const struct siu_port *siu;
 758         struct uart_port *port;
 759         int i, num;
 760
 761         switch (current_cpu_data.cputype) {
 762         case CPU_VR4111:
 763         case CPU_VR4121:
 764                 siu = siu_type1_ports;
 765                 break;
 766         case CPU_VR4122:
 767         case CPU_VR4131:
 768         case CPU_VR4133:
 769                 siu = siu_type2_ports;
 770                 break;
 771         default:
 772                 return 0;
 773         }
 774
 775         port = siu_uart_ports;
 776         num = siu_probe_ports();
 777         for (i = 0; i < num; i++) {
 778                 spin_lock_init(&port->lock);
 779                 port->irq = siu->irq;
 780                 port->uartclk = SIU_BAUD_BASE * 16;
 781                 port->fifosize = 16;
 782                 port->regshift = 0;
 783                 port->iotype = UPIO_MEM;
 784                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 785                 port->type = siu->type;
 786                 port->line = i;
 787                 port->mapbase = siu->start;
 788                 siu++;
 789                 port++;
 790         }
 791
 792         return num;
 793 }
 794
 795 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 796
 797 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 798
 799 static void wait_for_xmitr(struct uart_port *port)
 800 {
 801         int timeout = 10000;
 802         uint8_t lsr, msr;
 803
 804         do {
 805                 lsr = siu_read(port, UART_LSR);
 806                 if (lsr & UART_LSR_BI)
 807                         lsr_break_flag[port->line] = UART_LSR_BI;
 808
 809                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
 810                         break;
 811         } while (timeout-- > 0);
 812
 813         if (port->flags & UPF_CONS_FLOW) {
 814                 timeout = 1000000;
 815
 816                 do {
 817                         msr = siu_read(port, UART_MSR);
 818                         if ((msr & UART_MSR_CTS) != 0)
 819                                 break;
 820                 } while (timeout-- > 0);
 821         }
 822 }
 823
 824 static void siu_console_putchar(struct uart_port *port, int ch)
 825 {
 826         wait_for_xmitr(port);
 827         siu_write(port, UART_TX, ch);
 828 }
 829
 830 static void siu_console_write(struct console *con, const char *s, unsigned count)
 831 {
 832         struct uart_port *port;
 833         uint8_t ier;
 834
 835         port = &siu_uart_ports[con->index];
 836
 837         ier = siu_read(port, UART_IER);
 838         siu_write(port, UART_IER, 0);
 839
 840         uart_console_write(port, s, count, siu_console_putchar);
 841
 842         wait_for_xmitr(port);
 843         siu_write(port, UART_IER, ier);
 844 }
 845
 846 static int siu_console_setup(struct console *con, char *options)
 847 {
 848         struct uart_port *port;
 849         int baud = 9600;
 850         int parity = 'n';
 851         int bits = 8;
 852         int flow = 'n';
 853
 854         if (con->index >= SIU_PORTS_MAX)
 855                 con->index = 0;
 856
 857         port = &siu_uart_ports[con->index];
 858         if (port->membase == NULL) {
 859                 if (port->mapbase == 0)
 860                         return -ENODEV;
 861                 port->membase = ioremap(port->mapbase, siu_port_size(port));
 862         }
 863
 864         vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 865
 866         if (options != NULL)
 867                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 868
 869         return uart_set_options(port, con, baud, parity, bits, flow);
 870 }
 871
 872 static struct uart_driver siu_uart_driver;
 873
 874 static struct console siu_console = {
 875         .name   = "ttyVR",
 876         .write  = siu_console_write,
 877         .device = uart_console_device,
 878         .setup  = siu_console_setup,
 879         .flags  = CON_PRINTBUFFER,
 880         .index  = -1,
 881         .data   = &siu_uart_driver,
 882 };
 883
 884 static int __devinit siu_console_init(void)
 885 {
 886         struct uart_port *port;
 887         int num, i;
 888
 889         num = siu_init_ports();
 890         if (num <= 0)
 891                 return -ENODEV;
 892
 893         for (i = 0; i < num; i++) {
 894                 port = &siu_uart_ports[i];
 895                 port->ops = &siu_uart_ops;
 896         }
 897
 898         register_console(&siu_console);
 899
 900         return 0;
 901 }
 902
 903 console_initcall(siu_console_init);
 904
 905 #define SERIAL_VR41XX_CONSOLE   &siu_console
 906 #else
 907 #define SERIAL_VR41XX_CONSOLE   NULL
 908 #endif
 909
 910 static struct uart_driver siu_uart_driver = {
 911         .owner          = THIS_MODULE,
 912         .driver_name    = "SIU",
 913         .dev_name       = "ttyVR",
 914         .devfs_name     = "ttvr/",
 915         .major          = SIU_MAJOR,
 916         .minor          = SIU_MINOR_BASE,
 917         .cons           = SERIAL_VR41XX_CONSOLE,
 918 };
 919
 920 static int __devinit siu_probe(struct platform_device *dev)
 921 {
 922         struct uart_port *port;
 923         int num, i, retval;
 924
 925         num = siu_init_ports();
 926         if (num <= 0)
 927                 return -ENODEV;
 928
 929         siu_uart_driver.nr = num;
 930         retval = uart_register_driver(&siu_uart_driver);
 931         if (retval)
 932                 return retval;
 933
 934         for (i = 0; i < num; i++) {
 935                 port = &siu_uart_ports[i];
 936                 port->ops = &siu_uart_ops;
 937                 port->dev = &dev->dev;
 938
 939                 retval = uart_add_one_port(&siu_uart_driver, port);
 940                 if (retval < 0) {
 941                         port->dev = NULL;
 942                         break;
 943                 }
 944         }
 945
 946         if (i == 0 && retval < 0) {
 947                 uart_unregister_driver(&siu_uart_driver);
 948                 return retval;
 949         }
 950
 951         return 0;
 952 }
 953
 954 static int __devexit siu_remove(struct platform_device *dev)
 955 {
 956         struct uart_port *port;
 957         int i;
 958
 959         for (i = 0; i < siu_uart_driver.nr; i++) {
 960                 port = &siu_uart_ports[i];
 961                 if (port->dev == &dev->dev) {
 962                         uart_remove_one_port(&siu_uart_driver, port);
 963                         port->dev = NULL;
 964                 }
 965         }
 966
 967         uart_unregister_driver(&siu_uart_driver);
 968
 969         return 0;
 970 }
 971
 972 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 973 {
 974         struct uart_port *port;
 975         int i;
 976
 977         for (i = 0; i < siu_uart_driver.nr; i++) {
 978                 port = &siu_uart_ports[i];
 979                 if ((port->type == PORT_VR41XX_SIU ||
 980                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 981                         uart_suspend_port(&siu_uart_driver, port);
 982
 983         }
 984
 985         return 0;
 986 }
 987
 988 static int siu_resume(struct platform_device *dev)
 989 {
 990         struct uart_port *port;
 991         int i;
 992
 993         for (i = 0; i < siu_uart_driver.nr; i++) {
 994                 port = &siu_uart_ports[i];
 995                 if ((port->type == PORT_VR41XX_SIU ||
 996                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 997                         uart_resume_port(&siu_uart_driver, port);
 998         }
 999
1000         return 0;
1001 }
1002
1003 static struct platform_device *siu_platform_device;
1004
1005 static struct platform_driver siu_device_driver = {
1006         .probe          = siu_probe,
1007         .remove         = __devexit_p(siu_remove),
1008         .suspend        = siu_suspend,
1009         .resume         = siu_resume,
1010         .driver         = {
1011                 .name   = "SIU",
1012                 .owner  = THIS_MODULE,
1013         },
1014 };
1015
1016 static int __init vr41xx_siu_init(void)
1017 {
1018         int retval;
1019
1020         siu_platform_device = platform_device_alloc("SIU", -1);
1021         if (!siu_platform_device)
1022                 return -ENOMEM;
1023
1024         retval = platform_device_add(siu_platform_device);
1025         if (retval < 0) {
1026                 platform_device_put(siu_platform_device);
1027                 return retval;
1028         }
1029
1030         retval = platform_driver_register(&siu_device_driver);
1031         if (retval < 0)
1032                 platform_device_unregister(siu_platform_device);
1033
1034         return retval;
1035 }
1036
1037 static void __exit vr41xx_siu_exit(void)
1038 {
1039         platform_driver_unregister(&siu_device_driver);
1040         platform_device_unregister(siu_platform_device);
1041 }
1042
1043 module_init(vr41xx_siu_init);
1044 module_exit(vr41xx_siu_exit);