drivers/tty/serial/vr41xx_siu.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Driver for NEC VR4100 series Serial Interface Unit.
   4  *
   5  *  Copyright (C) 2004-2008  Yoichi Yuasa <[email protected]>
   6  *
   7  *  Based on drivers/serial/8250.c, by Russell King.
   8  */
   9
  10 #if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  11 #define SUPPORT_SYSRQ
  12 #endif
  13
  14 #include <linux/console.h>
  15 #include <linux/errno.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/ioport.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/serial.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/serial_reg.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26
  27 #include <asm/io.h>
  28 #include <asm/vr41xx/siu.h>
  29 #include <asm/vr41xx/vr41xx.h>
  30
  31 #define SIU_BAUD_BASE   1152000
  32 #define SIU_MAJOR       204
  33 #define SIU_MINOR_BASE  82
  34
  35 #define RX_MAX_COUNT    256
  36 #define TX_MAX_COUNT    15
  37
  38 #define SIUIRSEL        0x08
  39  #define TMICMODE       0x20
  40  #define TMICTX         0x10
  41  #define IRMSEL         0x0c
  42  #define IRMSEL_HP      0x08
  43  #define IRMSEL_TEMIC   0x04
  44  #define IRMSEL_SHARP   0x00
  45  #define IRUSESEL       0x02
  46  #define SIRSEL         0x01
  47
  48 static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
  49         [0 ... SIU_PORTS_MAX-1] = {
  50                 .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
  51                 .irq    = 0,
  52         },
  53 };
  54
  55 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
  56 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
  57 #endif
  58
  59 #define siu_read(port, offset)          readb((port)->membase + (offset))
  60 #define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
  61
  62 void vr41xx_select_siu_interface(siu_interface_t interface)
  63 {
  64         struct uart_port *port;
  65         unsigned long flags;
  66         uint8_t irsel;
  67
  68         port = &siu_uart_ports[0];
  69
  70         spin_lock_irqsave(&port->lock, flags);
  71
  72         irsel = siu_read(port, SIUIRSEL);
  73         if (interface == SIU_INTERFACE_IRDA)
  74                 irsel |= SIRSEL;
  75         else
  76                 irsel &= ~SIRSEL;
  77         siu_write(port, SIUIRSEL, irsel);
  78
  79         spin_unlock_irqrestore(&port->lock, flags);
  80 }
  81 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
  82
  83 void vr41xx_use_irda(irda_use_t use)
  84 {
  85         struct uart_port *port;
  86         unsigned long flags;
  87         uint8_t irsel;
  88
  89         port = &siu_uart_ports[0];
  90
  91         spin_lock_irqsave(&port->lock, flags);
  92
  93         irsel = siu_read(port, SIUIRSEL);
  94         if (use == FIR_USE_IRDA)
  95                 irsel |= IRUSESEL;
  96         else
  97                 irsel &= ~IRUSESEL;
  98         siu_write(port, SIUIRSEL, irsel);
  99
 100         spin_unlock_irqrestore(&port->lock, flags);
 101 }
 102 EXPORT_SYMBOL_GPL(vr41xx_use_irda);
 103
 104 void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
 105 {
 106         struct uart_port *port;
 107         unsigned long flags;
 108         uint8_t irsel;
 109
 110         port = &siu_uart_ports[0];
 111
 112         spin_lock_irqsave(&port->lock, flags);
 113
 114         irsel = siu_read(port, SIUIRSEL);
 115         irsel &= ~(IRMSEL | TMICTX | TMICMODE);
 116         switch (module) {
 117         case SHARP_IRDA:
 118                 irsel |= IRMSEL_SHARP;
 119                 break;
 120         case TEMIC_IRDA:
 121                 irsel |= IRMSEL_TEMIC | TMICMODE;
 122                 if (speed == IRDA_TX_4MBPS)
 123                         irsel |= TMICTX;
 124                 break;
 125         case HP_IRDA:
 126                 irsel |= IRMSEL_HP;
 127                 break;
 128         default:
 129                 break;
 130         }
 131         siu_write(port, SIUIRSEL, irsel);
 132
 133         spin_unlock_irqrestore(&port->lock, flags);
 134 }
 135 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
 136
 137 static inline void siu_clear_fifo(struct uart_port *port)
 138 {
 139         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
 140         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 141                                   UART_FCR_CLEAR_XMIT);
 142         siu_write(port, UART_FCR, 0);
 143 }
 144
 145 static inline unsigned long siu_port_size(struct uart_port *port)
 146 {
 147         switch (port->type) {
 148         case PORT_VR41XX_SIU:
 149                 return 11UL;
 150         case PORT_VR41XX_DSIU:
 151                 return 8UL;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static inline unsigned int siu_check_type(struct uart_port *port)
 158 {
 159         if (port->line == 0)
 160                 return PORT_VR41XX_SIU;
 161         if (port->line == 1 && port->irq)
 162                 return PORT_VR41XX_DSIU;
 163
 164         return PORT_UNKNOWN;
 165 }
 166
 167 static inline const char *siu_type_name(struct uart_port *port)
 168 {
 169         switch (port->type) {
 170         case PORT_VR41XX_SIU:
 171                 return "SIU";
 172         case PORT_VR41XX_DSIU:
 173                 return "DSIU";
 174         }
 175
 176         return NULL;
 177 }
 178
 179 static unsigned int siu_tx_empty(struct uart_port *port)
 180 {
 181         uint8_t lsr;
 182
 183         lsr = siu_read(port, UART_LSR);
 184         if (lsr & UART_LSR_TEMT)
 185                 return TIOCSER_TEMT;
 186
 187         return 0;
 188 }
 189
 190 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 191 {
 192         uint8_t mcr = 0;
 193
 194         if (mctrl & TIOCM_DTR)
 195                 mcr |= UART_MCR_DTR;
 196         if (mctrl & TIOCM_RTS)
 197                 mcr |= UART_MCR_RTS;
 198         if (mctrl & TIOCM_OUT1)
 199                 mcr |= UART_MCR_OUT1;
 200         if (mctrl & TIOCM_OUT2)
 201                 mcr |= UART_MCR_OUT2;
 202         if (mctrl & TIOCM_LOOP)
 203                 mcr |= UART_MCR_LOOP;
 204
 205         siu_write(port, UART_MCR, mcr);
 206 }
 207
 208 static unsigned int siu_get_mctrl(struct uart_port *port)
 209 {
 210         uint8_t msr;
 211         unsigned int mctrl = 0;
 212
 213         msr = siu_read(port, UART_MSR);
 214         if (msr & UART_MSR_DCD)
 215                 mctrl |= TIOCM_CAR;
 216         if (msr & UART_MSR_RI)
 217                 mctrl |= TIOCM_RNG;
 218         if (msr & UART_MSR_DSR)
 219                 mctrl |= TIOCM_DSR;
 220         if (msr & UART_MSR_CTS)
 221                 mctrl |= TIOCM_CTS;
 222
 223         return mctrl;
 224 }
 225
 226 static void siu_stop_tx(struct uart_port *port)
 227 {
 228         unsigned long flags;
 229         uint8_t ier;
 230
 231         spin_lock_irqsave(&port->lock, flags);
 232
 233         ier = siu_read(port, UART_IER);
 234         ier &= ~UART_IER_THRI;
 235         siu_write(port, UART_IER, ier);
 236
 237         spin_unlock_irqrestore(&port->lock, flags);
 238 }
 239
 240 static void siu_start_tx(struct uart_port *port)
 241 {
 242         unsigned long flags;
 243         uint8_t ier;
 244
 245         spin_lock_irqsave(&port->lock, flags);
 246
 247         ier = siu_read(port, UART_IER);
 248         ier |= UART_IER_THRI;
 249         siu_write(port, UART_IER, ier);
 250
 251         spin_unlock_irqrestore(&port->lock, flags);
 252 }
 253
 254 static void siu_stop_rx(struct uart_port *port)
 255 {
 256         unsigned long flags;
 257         uint8_t ier;
 258
 259         spin_lock_irqsave(&port->lock, flags);
 260
 261         ier = siu_read(port, UART_IER);
 262         ier &= ~UART_IER_RLSI;
 263         siu_write(port, UART_IER, ier);
 264
 265         port->read_status_mask &= ~UART_LSR_DR;
 266
 267         spin_unlock_irqrestore(&port->lock, flags);
 268 }
 269
 270 static void siu_enable_ms(struct uart_port *port)
 271 {
 272         unsigned long flags;
 273         uint8_t ier;
 274
 275         spin_lock_irqsave(&port->lock, flags);
 276
 277         ier = siu_read(port, UART_IER);
 278         ier |= UART_IER_MSI;
 279         siu_write(port, UART_IER, ier);
 280
 281         spin_unlock_irqrestore(&port->lock, flags);
 282 }
 283
 284 static void siu_break_ctl(struct uart_port *port, int ctl)
 285 {
 286         unsigned long flags;
 287         uint8_t lcr;
 288
 289         spin_lock_irqsave(&port->lock, flags);
 290
 291         lcr = siu_read(port, UART_LCR);
 292         if (ctl == -1)
 293                 lcr |= UART_LCR_SBC;
 294         else
 295                 lcr &= ~UART_LCR_SBC;
 296         siu_write(port, UART_LCR, lcr);
 297
 298         spin_unlock_irqrestore(&port->lock, flags);
 299 }
 300
 301 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 302 {
 303         uint8_t lsr, ch;
 304         char flag;
 305         int max_count = RX_MAX_COUNT;
 306
 307         lsr = *status;
 308
 309         do {
 310                 ch = siu_read(port, UART_RX);
 311                 port->icount.rx++;
 312                 flag = TTY_NORMAL;
 313
 314 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 315                 lsr |= lsr_break_flag[port->line];
 316                 lsr_break_flag[port->line] = 0;
 317 #endif
 318                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
 319                                     UART_LSR_PE | UART_LSR_OE))) {
 320                         if (lsr & UART_LSR_BI) {
 321                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 322                                 port->icount.brk++;
 323
 324                                 if (uart_handle_break(port))
 325                                         goto ignore_char;
 326                         }
 327
 328                         if (lsr & UART_LSR_FE)
 329                                 port->icount.frame++;
 330                         if (lsr & UART_LSR_PE)
 331                                 port->icount.parity++;
 332                         if (lsr & UART_LSR_OE)
 333                                 port->icount.overrun++;
 334
 335                         lsr &= port->read_status_mask;
 336                         if (lsr & UART_LSR_BI)
 337                                 flag = TTY_BREAK;
 338                         if (lsr & UART_LSR_FE)
 339                                 flag = TTY_FRAME;
 340                         if (lsr & UART_LSR_PE)
 341                                 flag = TTY_PARITY;
 342                 }
 343
 344                 if (uart_handle_sysrq_char(port, ch))
 345                         goto ignore_char;
 346
 347                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
 348
 349         ignore_char:
 350                 lsr = siu_read(port, UART_LSR);
 351         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 352
 353         tty_flip_buffer_push(&port->state->port);
 354
 355         *status = lsr;
 356 }
 357
 358 static inline void check_modem_status(struct uart_port *port)
 359 {
 360         uint8_t msr;
 361
 362         msr = siu_read(port, UART_MSR);
 363         if ((msr & UART_MSR_ANY_DELTA) == 0)
 364                 return;
 365         if (msr & UART_MSR_DDCD)
 366                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
 367         if (msr & UART_MSR_TERI)
 368                 port->icount.rng++;
 369         if (msr & UART_MSR_DDSR)
 370                 port->icount.dsr++;
 371         if (msr & UART_MSR_DCTS)
 372                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
 373
 374         wake_up_interruptible(&port->state->port.delta_msr_wait);
 375 }
 376
 377 static inline void transmit_chars(struct uart_port *port)
 378 {
 379         struct circ_buf *xmit;
 380         int max_count = TX_MAX_COUNT;
 381
 382         xmit = &port->state->xmit;
 383
 384         if (port->x_char) {
 385                 siu_write(port, UART_TX, port->x_char);
 386                 port->icount.tx++;
 387                 port->x_char = 0;
 388                 return;
 389         }
 390
 391         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 392                 siu_stop_tx(port);
 393                 return;
 394         }
 395
 396         do {
 397                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
 398                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 399                 port->icount.tx++;
 400                 if (uart_circ_empty(xmit))
 401                         break;
 402         } while (max_count-- > 0);
 403
 404         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 405                 uart_write_wakeup(port);
 406
 407         if (uart_circ_empty(xmit))
 408                 siu_stop_tx(port);
 409 }
 410
 411 static irqreturn_t siu_interrupt(int irq, void *dev_id)
 412 {
 413         struct uart_port *port;
 414         uint8_t iir, lsr;
 415
 416         port = (struct uart_port *)dev_id;
 417
 418         iir = siu_read(port, UART_IIR);
 419         if (iir & UART_IIR_NO_INT)
 420                 return IRQ_NONE;
 421
 422         lsr = siu_read(port, UART_LSR);
 423         if (lsr & UART_LSR_DR)
 424                 receive_chars(port, &lsr);
 425
 426         check_modem_status(port);
 427
 428         if (lsr & UART_LSR_THRE)
 429                 transmit_chars(port);
 430
 431         return IRQ_HANDLED;
 432 }
 433
 434 static int siu_startup(struct uart_port *port)
 435 {
 436         int retval;
 437
 438         if (port->membase == NULL)
 439                 return -ENODEV;
 440
 441         siu_clear_fifo(port);
 442
 443         (void)siu_read(port, UART_LSR);
 444         (void)siu_read(port, UART_RX);
 445         (void)siu_read(port, UART_IIR);
 446         (void)siu_read(port, UART_MSR);
 447
 448         if (siu_read(port, UART_LSR) == 0xff)
 449                 return -ENODEV;
 450
 451         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
 452         if (retval)
 453                 return retval;
 454
 455         if (port->type == PORT_VR41XX_DSIU)
 456                 vr41xx_enable_dsiuint(DSIUINT_ALL);
 457
 458         siu_write(port, UART_LCR, UART_LCR_WLEN8);
 459
 460         spin_lock_irq(&port->lock);
 461         siu_set_mctrl(port, port->mctrl);
 462         spin_unlock_irq(&port->lock);
 463
 464         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
 465
 466         (void)siu_read(port, UART_LSR);
 467         (void)siu_read(port, UART_RX);
 468         (void)siu_read(port, UART_IIR);
 469         (void)siu_read(port, UART_MSR);
 470
 471         return 0;
 472 }
 473
 474 static void siu_shutdown(struct uart_port *port)
 475 {
 476         unsigned long flags;
 477         uint8_t lcr;
 478
 479         siu_write(port, UART_IER, 0);
 480
 481         spin_lock_irqsave(&port->lock, flags);
 482
 483         port->mctrl &= ~TIOCM_OUT2;
 484         siu_set_mctrl(port, port->mctrl);
 485
 486         spin_unlock_irqrestore(&port->lock, flags);
 487
 488         lcr = siu_read(port, UART_LCR);
 489         lcr &= ~UART_LCR_SBC;
 490         siu_write(port, UART_LCR, lcr);
 491
 492         siu_clear_fifo(port);
 493
 494         (void)siu_read(port, UART_RX);
 495
 496         if (port->type == PORT_VR41XX_DSIU)
 497                 vr41xx_disable_dsiuint(DSIUINT_ALL);
 498
 499         free_irq(port->irq, port);
 500 }
 501
 502 static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 503                             struct ktermios *old)
 504 {
 505         tcflag_t c_cflag, c_iflag;
 506         uint8_t lcr, fcr, ier;
 507         unsigned int baud, quot;
 508         unsigned long flags;
 509
 510         c_cflag = new->c_cflag;
 511         switch (c_cflag & CSIZE) {
 512         case CS5:
 513                 lcr = UART_LCR_WLEN5;
 514                 break;
 515         case CS6:
 516                 lcr = UART_LCR_WLEN6;
 517                 break;
 518         case CS7:
 519                 lcr = UART_LCR_WLEN7;
 520                 break;
 521         default:
 522                 lcr = UART_LCR_WLEN8;
 523                 break;
 524         }
 525
 526         if (c_cflag & CSTOPB)
 527                 lcr |= UART_LCR_STOP;
 528         if (c_cflag & PARENB)
 529                 lcr |= UART_LCR_PARITY;
 530         if ((c_cflag & PARODD) != PARODD)
 531                 lcr |= UART_LCR_EPAR;
 532         if (c_cflag & CMSPAR)
 533                 lcr |= UART_LCR_SPAR;
 534
 535         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
 536         quot = uart_get_divisor(port, baud);
 537
 538         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
 539
 540         spin_lock_irqsave(&port->lock, flags);
 541
 542         uart_update_timeout(port, c_cflag, baud);
 543
 544         c_iflag = new->c_iflag;
 545
 546         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
 547         if (c_iflag & INPCK)
 548                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 549         if (c_iflag & (IGNBRK | BRKINT | PARMRK))
 550                 port->read_status_mask |= UART_LSR_BI;
 551
 552         port->ignore_status_mask = 0;
 553         if (c_iflag & IGNPAR)
 554                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
 555         if (c_iflag & IGNBRK) {
 556                 port->ignore_status_mask |= UART_LSR_BI;
 557                 if (c_iflag & IGNPAR)
 558                         port->ignore_status_mask |= UART_LSR_OE;
 559         }
 560
 561         if ((c_cflag & CREAD) == 0)
 562                 port->ignore_status_mask |= UART_LSR_DR;
 563
 564         ier = siu_read(port, UART_IER);
 565         ier &= ~UART_IER_MSI;
 566         if (UART_ENABLE_MS(port, c_cflag))
 567                 ier |= UART_IER_MSI;
 568         siu_write(port, UART_IER, ier);
 569
 570         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
 571
 572         siu_write(port, UART_DLL, (uint8_t)quot);
 573         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
 574
 575         siu_write(port, UART_LCR, lcr);
 576
 577         siu_write(port, UART_FCR, fcr);
 578
 579         siu_set_mctrl(port, port->mctrl);
 580
 581         spin_unlock_irqrestore(&port->lock, flags);
 582 }
 583
 584 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
 585 {
 586         switch (state) {
 587         case 0:
 588                 switch (port->type) {
 589                 case PORT_VR41XX_SIU:
 590                         vr41xx_supply_clock(SIU_CLOCK);
 591                         break;
 592                 case PORT_VR41XX_DSIU:
 593                         vr41xx_supply_clock(DSIU_CLOCK);
 594                         break;
 595                 }
 596                 break;
 597         case 3:
 598                 switch (port->type) {
 599                 case PORT_VR41XX_SIU:
 600                         vr41xx_mask_clock(SIU_CLOCK);
 601                         break;
 602                 case PORT_VR41XX_DSIU:
 603                         vr41xx_mask_clock(DSIU_CLOCK);
 604                         break;
 605                 }
 606                 break;
 607         }
 608 }
 609
 610 static const char *siu_type(struct uart_port *port)
 611 {
 612         return siu_type_name(port);
 613 }
 614
 615 static void siu_release_port(struct uart_port *port)
 616 {
 617         unsigned long size;
 618
 619         if (port->flags & UPF_IOREMAP) {
 620                 iounmap(port->membase);
 621                 port->membase = NULL;
 622         }
 623
 624         size = siu_port_size(port);
 625         release_mem_region(port->mapbase, size);
 626 }
 627
 628 static int siu_request_port(struct uart_port *port)
 629 {
 630         unsigned long size;
 631         struct resource *res;
 632
 633         size = siu_port_size(port);
 634         res = request_mem_region(port->mapbase, size, siu_type_name(port));
 635         if (res == NULL)
 636                 return -EBUSY;
 637
 638         if (port->flags & UPF_IOREMAP) {
 639                 port->membase = ioremap(port->mapbase, size);
 640                 if (port->membase == NULL) {
 641                         release_resource(res);
 642                         return -ENOMEM;
 643                 }
 644         }
 645
 646         return 0;
 647 }
 648
 649 static void siu_config_port(struct uart_port *port, int flags)
 650 {
 651         if (flags & UART_CONFIG_TYPE) {
 652                 port->type = siu_check_type(port);
 653                 (void)siu_request_port(port);
 654         }
 655 }
 656
 657 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
 658 {
 659         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
 660                 return -EINVAL;
 661         if (port->irq != serial->irq)
 662                 return -EINVAL;
 663         if (port->iotype != serial->io_type)
 664                 return -EINVAL;
 665         if (port->mapbase != (unsigned long)serial->iomem_base)
 666                 return -EINVAL;
 667
 668         return 0;
 669 }
 670
 671 static const struct uart_ops siu_uart_ops = {
 672         .tx_empty       = siu_tx_empty,
 673         .set_mctrl      = siu_set_mctrl,
 674         .get_mctrl      = siu_get_mctrl,
 675         .stop_tx        = siu_stop_tx,
 676         .start_tx       = siu_start_tx,
 677         .stop_rx        = siu_stop_rx,
 678         .enable_ms      = siu_enable_ms,
 679         .break_ctl      = siu_break_ctl,
 680         .startup        = siu_startup,
 681         .shutdown       = siu_shutdown,
 682         .set_termios    = siu_set_termios,
 683         .pm             = siu_pm,
 684         .type           = siu_type,
 685         .release_port   = siu_release_port,
 686         .request_port   = siu_request_port,
 687         .config_port    = siu_config_port,
 688         .verify_port    = siu_verify_port,
 689 };
 690
 691 static int siu_init_ports(struct platform_device *pdev)
 692 {
 693         struct uart_port *port;
 694         struct resource *res;
 695         int *type = dev_get_platdata(&pdev->dev);
 696         int i;
 697
 698         if (!type)
 699                 return 0;
 700
 701         port = siu_uart_ports;
 702         for (i = 0; i < SIU_PORTS_MAX; i++) {
 703                 port->type = type[i];
 704                 if (port->type == PORT_UNKNOWN)
 705                         continue;
 706                 port->irq = platform_get_irq(pdev, i);
 707                 port->uartclk = SIU_BAUD_BASE * 16;
 708                 port->fifosize = 16;
 709                 port->regshift = 0;
 710                 port->iotype = UPIO_MEM;
 711                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 712                 port->line = i;
 713                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 714                 port->mapbase = res->start;
 715                 port++;
 716         }
 717
 718         return i;
 719 }
 720
 721 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 722
 723 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 724
 725 static void wait_for_xmitr(struct uart_port *port)
 726 {
 727         int timeout = 10000;
 728         uint8_t lsr, msr;
 729
 730         do {
 731                 lsr = siu_read(port, UART_LSR);
 732                 if (lsr & UART_LSR_BI)
 733                         lsr_break_flag[port->line] = UART_LSR_BI;
 734
 735                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
 736                         break;
 737         } while (timeout-- > 0);
 738
 739         if (port->flags & UPF_CONS_FLOW) {
 740                 timeout = 1000000;
 741
 742                 do {
 743                         msr = siu_read(port, UART_MSR);
 744                         if ((msr & UART_MSR_CTS) != 0)
 745                                 break;
 746                 } while (timeout-- > 0);
 747         }
 748 }
 749
 750 static void siu_console_putchar(struct uart_port *port, int ch)
 751 {
 752         wait_for_xmitr(port);
 753         siu_write(port, UART_TX, ch);
 754 }
 755
 756 static void siu_console_write(struct console *con, const char *s, unsigned count)
 757 {
 758         struct uart_port *port;
 759         uint8_t ier;
 760
 761         port = &siu_uart_ports[con->index];
 762
 763         ier = siu_read(port, UART_IER);
 764         siu_write(port, UART_IER, 0);
 765
 766         uart_console_write(port, s, count, siu_console_putchar);
 767
 768         wait_for_xmitr(port);
 769         siu_write(port, UART_IER, ier);
 770 }
 771
 772 static int __init siu_console_setup(struct console *con, char *options)
 773 {
 774         struct uart_port *port;
 775         int baud = 9600;
 776         int parity = 'n';
 777         int bits = 8;
 778         int flow = 'n';
 779
 780         if (con->index >= SIU_PORTS_MAX)
 781                 con->index = 0;
 782
 783         port = &siu_uart_ports[con->index];
 784         if (port->membase == NULL) {
 785                 if (port->mapbase == 0)
 786                         return -ENODEV;
 787                 port->membase = ioremap(port->mapbase, siu_port_size(port));
 788         }
 789
 790         if (port->type == PORT_VR41XX_SIU)
 791                 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 792
 793         if (options != NULL)
 794                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 795
 796         return uart_set_options(port, con, baud, parity, bits, flow);
 797 }
 798
 799 static struct uart_driver siu_uart_driver;
 800
 801 static struct console siu_console = {
 802         .name   = "ttyVR",
 803         .write  = siu_console_write,
 804         .device = uart_console_device,
 805         .setup  = siu_console_setup,
 806         .flags  = CON_PRINTBUFFER,
 807         .index  = -1,
 808         .data   = &siu_uart_driver,
 809 };
 810
 811 static int siu_console_init(void)
 812 {
 813         struct uart_port *port;
 814         int i;
 815
 816         for (i = 0; i < SIU_PORTS_MAX; i++) {
 817                 port = &siu_uart_ports[i];
 818                 port->ops = &siu_uart_ops;
 819         }
 820
 821         register_console(&siu_console);
 822
 823         return 0;
 824 }
 825
 826 console_initcall(siu_console_init);
 827
 828 void __init vr41xx_siu_early_setup(struct uart_port *port)
 829 {
 830         if (port->type == PORT_UNKNOWN)
 831                 return;
 832
 833         siu_uart_ports[port->line].line = port->line;
 834         siu_uart_ports[port->line].type = port->type;
 835         siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
 836         siu_uart_ports[port->line].mapbase = port->mapbase;
 837         siu_uart_ports[port->line].ops = &siu_uart_ops;
 838 }
 839
 840 #define SERIAL_VR41XX_CONSOLE   &siu_console
 841 #else
 842 #define SERIAL_VR41XX_CONSOLE   NULL
 843 #endif
 844
 845 static struct uart_driver siu_uart_driver = {
 846         .owner          = THIS_MODULE,
 847         .driver_name    = "SIU",
 848         .dev_name       = "ttyVR",
 849         .major          = SIU_MAJOR,
 850         .minor          = SIU_MINOR_BASE,
 851         .cons           = SERIAL_VR41XX_CONSOLE,
 852 };
 853
 854 static int siu_probe(struct platform_device *dev)
 855 {
 856         struct uart_port *port;
 857         int num, i, retval;
 858
 859         num = siu_init_ports(dev);
 860         if (num <= 0)
 861                 return -ENODEV;
 862
 863         siu_uart_driver.nr = num;
 864         retval = uart_register_driver(&siu_uart_driver);
 865         if (retval)
 866                 return retval;
 867
 868         for (i = 0; i < num; i++) {
 869                 port = &siu_uart_ports[i];
 870                 port->ops = &siu_uart_ops;
 871                 port->dev = &dev->dev;
 872
 873                 retval = uart_add_one_port(&siu_uart_driver, port);
 874                 if (retval < 0) {
 875                         port->dev = NULL;
 876                         break;
 877                 }
 878         }
 879
 880         if (i == 0 && retval < 0) {
 881                 uart_unregister_driver(&siu_uart_driver);
 882                 return retval;
 883         }
 884
 885         return 0;
 886 }
 887
 888 static int siu_remove(struct platform_device *dev)
 889 {
 890         struct uart_port *port;
 891         int i;
 892
 893         for (i = 0; i < siu_uart_driver.nr; i++) {
 894                 port = &siu_uart_ports[i];
 895                 if (port->dev == &dev->dev) {
 896                         uart_remove_one_port(&siu_uart_driver, port);
 897                         port->dev = NULL;
 898                 }
 899         }
 900
 901         uart_unregister_driver(&siu_uart_driver);
 902
 903         return 0;
 904 }
 905
 906 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 907 {
 908         struct uart_port *port;
 909         int i;
 910
 911         for (i = 0; i < siu_uart_driver.nr; i++) {
 912                 port = &siu_uart_ports[i];
 913                 if ((port->type == PORT_VR41XX_SIU ||
 914                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 915                         uart_suspend_port(&siu_uart_driver, port);
 916
 917         }
 918
 919         return 0;
 920 }
 921
 922 static int siu_resume(struct platform_device *dev)
 923 {
 924         struct uart_port *port;
 925         int i;
 926
 927         for (i = 0; i < siu_uart_driver.nr; i++) {
 928                 port = &siu_uart_ports[i];
 929                 if ((port->type == PORT_VR41XX_SIU ||
 930                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 931                         uart_resume_port(&siu_uart_driver, port);
 932         }
 933
 934         return 0;
 935 }
 936
 937 static struct platform_driver siu_device_driver = {
 938         .probe          = siu_probe,
 939         .remove         = siu_remove,
 940         .suspend        = siu_suspend,
 941         .resume         = siu_resume,
 942         .driver         = {
 943                 .name   = "SIU",
 944         },
 945 };
 946
 947 module_platform_driver(siu_device_driver);
 948
 949 MODULE_LICENSE("GPL");
 950 MODULE_ALIAS("platform:SIU");