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 <yuasa@linux-mips.org>
   6  *
   7  *  Based on drivers/serial/8250.c, by Russell King.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  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/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/ioport.h>
  33 #include <linux/module.h>
  34 #include <linux/platform_device.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_BAUD_BASE   1152000
  46 #define SIU_MAJOR       204
  47 #define SIU_MINOR_BASE  82
  48
  49 #define RX_MAX_COUNT    256
  50 #define TX_MAX_COUNT    15
  51
  52 #define SIUIRSEL        0x08
  53  #define TMICMODE       0x20
  54  #define TMICTX         0x10
  55  #define IRMSEL         0x0c
  56  #define IRMSEL_HP      0x08
  57  #define IRMSEL_TEMIC   0x04
  58  #define IRMSEL_SHARP   0x00
  59  #define IRUSESEL       0x02
  60  #define SIRSEL         0x01
  61
  62 static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
  63         [0 ... SIU_PORTS_MAX-1] = {
  64                 .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
  65                 .irq    = 0,
  66         },
  67 };
  68
  69 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
  70 static uint8_t lsr_break_flag[SIU_PORTS_MAX];
  71 #endif
  72
  73 #define siu_read(port, offset)          readb((port)->membase + (offset))
  74 #define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
  75
  76 void vr41xx_select_siu_interface(siu_interface_t interface)
  77 {
  78         struct uart_port *port;
  79         unsigned long flags;
  80         uint8_t irsel;
  81
  82         port = &siu_uart_ports[0];
  83
  84         spin_lock_irqsave(&port->lock, flags);
  85
  86         irsel = siu_read(port, SIUIRSEL);
  87         if (interface == SIU_INTERFACE_IRDA)
  88                 irsel |= SIRSEL;
  89         else
  90                 irsel &= ~SIRSEL;
  91         siu_write(port, SIUIRSEL, irsel);
  92
  93         spin_unlock_irqrestore(&port->lock, flags);
  94 }
  95 EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
  96
  97 void vr41xx_use_irda(irda_use_t use)
  98 {
  99         struct uart_port *port;
 100         unsigned long flags;
 101         uint8_t irsel;
 102
 103         port = &siu_uart_ports[0];
 104
 105         spin_lock_irqsave(&port->lock, flags);
 106
 107         irsel = siu_read(port, SIUIRSEL);
 108         if (use == FIR_USE_IRDA)
 109                 irsel |= IRUSESEL;
 110         else
 111                 irsel &= ~IRUSESEL;
 112         siu_write(port, SIUIRSEL, irsel);
 113
 114         spin_unlock_irqrestore(&port->lock, flags);
 115 }
 116 EXPORT_SYMBOL_GPL(vr41xx_use_irda);
 117
 118 void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
 119 {
 120         struct uart_port *port;
 121         unsigned long flags;
 122         uint8_t irsel;
 123
 124         port = &siu_uart_ports[0];
 125
 126         spin_lock_irqsave(&port->lock, flags);
 127
 128         irsel = siu_read(port, SIUIRSEL);
 129         irsel &= ~(IRMSEL | TMICTX | TMICMODE);
 130         switch (module) {
 131         case SHARP_IRDA:
 132                 irsel |= IRMSEL_SHARP;
 133                 break;
 134         case TEMIC_IRDA:
 135                 irsel |= IRMSEL_TEMIC | TMICMODE;
 136                 if (speed == IRDA_TX_4MBPS)
 137                         irsel |= TMICTX;
 138                 break;
 139         case HP_IRDA:
 140                 irsel |= IRMSEL_HP;
 141                 break;
 142         default:
 143                 break;
 144         }
 145         siu_write(port, SIUIRSEL, irsel);
 146
 147         spin_unlock_irqrestore(&port->lock, flags);
 148 }
 149 EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
 150
 151 static inline void siu_clear_fifo(struct uart_port *port)
 152 {
 153         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
 154         siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 155                                   UART_FCR_CLEAR_XMIT);
 156         siu_write(port, UART_FCR, 0);
 157 }
 158
 159 static inline unsigned long siu_port_size(struct uart_port *port)
 160 {
 161         switch (port->type) {
 162         case PORT_VR41XX_SIU:
 163                 return 11UL;
 164         case PORT_VR41XX_DSIU:
 165                 return 8UL;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static inline unsigned int siu_check_type(struct uart_port *port)
 172 {
 173         if (port->line == 0)
 174                 return PORT_VR41XX_SIU;
 175         if (port->line == 1 && port->irq)
 176                 return PORT_VR41XX_DSIU;
 177
 178         return PORT_UNKNOWN;
 179 }
 180
 181 static inline const char *siu_type_name(struct uart_port *port)
 182 {
 183         switch (port->type) {
 184         case PORT_VR41XX_SIU:
 185                 return "SIU";
 186         case PORT_VR41XX_DSIU:
 187                 return "DSIU";
 188         }
 189
 190         return NULL;
 191 }
 192
 193 static unsigned int siu_tx_empty(struct uart_port *port)
 194 {
 195         uint8_t lsr;
 196
 197         lsr = siu_read(port, UART_LSR);
 198         if (lsr & UART_LSR_TEMT)
 199                 return TIOCSER_TEMT;
 200
 201         return 0;
 202 }
 203
 204 static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
 205 {
 206         uint8_t mcr = 0;
 207
 208         if (mctrl & TIOCM_DTR)
 209                 mcr |= UART_MCR_DTR;
 210         if (mctrl & TIOCM_RTS)
 211                 mcr |= UART_MCR_RTS;
 212         if (mctrl & TIOCM_OUT1)
 213                 mcr |= UART_MCR_OUT1;
 214         if (mctrl & TIOCM_OUT2)
 215                 mcr |= UART_MCR_OUT2;
 216         if (mctrl & TIOCM_LOOP)
 217                 mcr |= UART_MCR_LOOP;
 218
 219         siu_write(port, UART_MCR, mcr);
 220 }
 221
 222 static unsigned int siu_get_mctrl(struct uart_port *port)
 223 {
 224         uint8_t msr;
 225         unsigned int mctrl = 0;
 226
 227         msr = siu_read(port, UART_MSR);
 228         if (msr & UART_MSR_DCD)
 229                 mctrl |= TIOCM_CAR;
 230         if (msr & UART_MSR_RI)
 231                 mctrl |= TIOCM_RNG;
 232         if (msr & UART_MSR_DSR)
 233                 mctrl |= TIOCM_DSR;
 234         if (msr & UART_MSR_CTS)
 235                 mctrl |= TIOCM_CTS;
 236
 237         return mctrl;
 238 }
 239
 240 static void siu_stop_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_start_tx(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_THRI;
 263         siu_write(port, UART_IER, ier);
 264
 265         spin_unlock_irqrestore(&port->lock, flags);
 266 }
 267
 268 static void siu_stop_rx(struct uart_port *port)
 269 {
 270         unsigned long flags;
 271         uint8_t ier;
 272
 273         spin_lock_irqsave(&port->lock, flags);
 274
 275         ier = siu_read(port, UART_IER);
 276         ier &= ~UART_IER_RLSI;
 277         siu_write(port, UART_IER, ier);
 278
 279         port->read_status_mask &= ~UART_LSR_DR;
 280
 281         spin_unlock_irqrestore(&port->lock, flags);
 282 }
 283
 284 static void siu_enable_ms(struct uart_port *port)
 285 {
 286         unsigned long flags;
 287         uint8_t ier;
 288
 289         spin_lock_irqsave(&port->lock, flags);
 290
 291         ier = siu_read(port, UART_IER);
 292         ier |= UART_IER_MSI;
 293         siu_write(port, UART_IER, ier);
 294
 295         spin_unlock_irqrestore(&port->lock, flags);
 296 }
 297
 298 static void siu_break_ctl(struct uart_port *port, int ctl)
 299 {
 300         unsigned long flags;
 301         uint8_t lcr;
 302
 303         spin_lock_irqsave(&port->lock, flags);
 304
 305         lcr = siu_read(port, UART_LCR);
 306         if (ctl == -1)
 307                 lcr |= UART_LCR_SBC;
 308         else
 309                 lcr &= ~UART_LCR_SBC;
 310         siu_write(port, UART_LCR, lcr);
 311
 312         spin_unlock_irqrestore(&port->lock, flags);
 313 }
 314
 315 static inline void receive_chars(struct uart_port *port, uint8_t *status)
 316 {
 317         uint8_t lsr, ch;
 318         char flag;
 319         int max_count = RX_MAX_COUNT;
 320
 321         lsr = *status;
 322
 323         do {
 324                 ch = siu_read(port, UART_RX);
 325                 port->icount.rx++;
 326                 flag = TTY_NORMAL;
 327
 328 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 329                 lsr |= lsr_break_flag[port->line];
 330                 lsr_break_flag[port->line] = 0;
 331 #endif
 332                 if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
 333                                     UART_LSR_PE | UART_LSR_OE))) {
 334                         if (lsr & UART_LSR_BI) {
 335                                 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
 336                                 port->icount.brk++;
 337
 338                                 if (uart_handle_break(port))
 339                                         goto ignore_char;
 340                         }
 341
 342                         if (lsr & UART_LSR_FE)
 343                                 port->icount.frame++;
 344                         if (lsr & UART_LSR_PE)
 345                                 port->icount.parity++;
 346                         if (lsr & UART_LSR_OE)
 347                                 port->icount.overrun++;
 348
 349                         lsr &= port->read_status_mask;
 350                         if (lsr & UART_LSR_BI)
 351                                 flag = TTY_BREAK;
 352                         if (lsr & UART_LSR_FE)
 353                                 flag = TTY_FRAME;
 354                         if (lsr & UART_LSR_PE)
 355                                 flag = TTY_PARITY;
 356                 }
 357
 358                 if (uart_handle_sysrq_char(port, ch))
 359                         goto ignore_char;
 360
 361                 uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
 362
 363         ignore_char:
 364                 lsr = siu_read(port, UART_LSR);
 365         } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
 366
 367         tty_flip_buffer_push(&port->state->port);
 368
 369         *status = lsr;
 370 }
 371
 372 static inline void check_modem_status(struct uart_port *port)
 373 {
 374         uint8_t msr;
 375
 376         msr = siu_read(port, UART_MSR);
 377         if ((msr & UART_MSR_ANY_DELTA) == 0)
 378                 return;
 379         if (msr & UART_MSR_DDCD)
 380                 uart_handle_dcd_change(port, msr & UART_MSR_DCD);
 381         if (msr & UART_MSR_TERI)
 382                 port->icount.rng++;
 383         if (msr & UART_MSR_DDSR)
 384                 port->icount.dsr++;
 385         if (msr & UART_MSR_DCTS)
 386                 uart_handle_cts_change(port, msr & UART_MSR_CTS);
 387
 388         wake_up_interruptible(&port->state->port.delta_msr_wait);
 389 }
 390
 391 static inline void transmit_chars(struct uart_port *port)
 392 {
 393         struct circ_buf *xmit;
 394         int max_count = TX_MAX_COUNT;
 395
 396         xmit = &port->state->xmit;
 397
 398         if (port->x_char) {
 399                 siu_write(port, UART_TX, port->x_char);
 400                 port->icount.tx++;
 401                 port->x_char = 0;
 402                 return;
 403         }
 404
 405         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 406                 siu_stop_tx(port);
 407                 return;
 408         }
 409
 410         do {
 411                 siu_write(port, UART_TX, xmit->buf[xmit->tail]);
 412                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 413                 port->icount.tx++;
 414                 if (uart_circ_empty(xmit))
 415                         break;
 416         } while (max_count-- > 0);
 417
 418         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 419                 uart_write_wakeup(port);
 420
 421         if (uart_circ_empty(xmit))
 422                 siu_stop_tx(port);
 423 }
 424
 425 static irqreturn_t siu_interrupt(int irq, void *dev_id)
 426 {
 427         struct uart_port *port;
 428         uint8_t iir, lsr;
 429
 430         port = (struct uart_port *)dev_id;
 431
 432         iir = siu_read(port, UART_IIR);
 433         if (iir & UART_IIR_NO_INT)
 434                 return IRQ_NONE;
 435
 436         lsr = siu_read(port, UART_LSR);
 437         if (lsr & UART_LSR_DR)
 438                 receive_chars(port, &lsr);
 439
 440         check_modem_status(port);
 441
 442         if (lsr & UART_LSR_THRE)
 443                 transmit_chars(port);
 444
 445         return IRQ_HANDLED;
 446 }
 447
 448 static int siu_startup(struct uart_port *port)
 449 {
 450         int retval;
 451
 452         if (port->membase == NULL)
 453                 return -ENODEV;
 454
 455         siu_clear_fifo(port);
 456
 457         (void)siu_read(port, UART_LSR);
 458         (void)siu_read(port, UART_RX);
 459         (void)siu_read(port, UART_IIR);
 460         (void)siu_read(port, UART_MSR);
 461
 462         if (siu_read(port, UART_LSR) == 0xff)
 463                 return -ENODEV;
 464
 465         retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
 466         if (retval)
 467                 return retval;
 468
 469         if (port->type == PORT_VR41XX_DSIU)
 470                 vr41xx_enable_dsiuint(DSIUINT_ALL);
 471
 472         siu_write(port, UART_LCR, UART_LCR_WLEN8);
 473
 474         spin_lock_irq(&port->lock);
 475         siu_set_mctrl(port, port->mctrl);
 476         spin_unlock_irq(&port->lock);
 477
 478         siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
 479
 480         (void)siu_read(port, UART_LSR);
 481         (void)siu_read(port, UART_RX);
 482         (void)siu_read(port, UART_IIR);
 483         (void)siu_read(port, UART_MSR);
 484
 485         return 0;
 486 }
 487
 488 static void siu_shutdown(struct uart_port *port)
 489 {
 490         unsigned long flags;
 491         uint8_t lcr;
 492
 493         siu_write(port, UART_IER, 0);
 494
 495         spin_lock_irqsave(&port->lock, flags);
 496
 497         port->mctrl &= ~TIOCM_OUT2;
 498         siu_set_mctrl(port, port->mctrl);
 499
 500         spin_unlock_irqrestore(&port->lock, flags);
 501
 502         lcr = siu_read(port, UART_LCR);
 503         lcr &= ~UART_LCR_SBC;
 504         siu_write(port, UART_LCR, lcr);
 505
 506         siu_clear_fifo(port);
 507
 508         (void)siu_read(port, UART_RX);
 509
 510         if (port->type == PORT_VR41XX_DSIU)
 511                 vr41xx_disable_dsiuint(DSIUINT_ALL);
 512
 513         free_irq(port->irq, port);
 514 }
 515
 516 static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 517                             struct ktermios *old)
 518 {
 519         tcflag_t c_cflag, c_iflag;
 520         uint8_t lcr, fcr, ier;
 521         unsigned int baud, quot;
 522         unsigned long flags;
 523
 524         c_cflag = new->c_cflag;
 525         switch (c_cflag & CSIZE) {
 526         case CS5:
 527                 lcr = UART_LCR_WLEN5;
 528                 break;
 529         case CS6:
 530                 lcr = UART_LCR_WLEN6;
 531                 break;
 532         case CS7:
 533                 lcr = UART_LCR_WLEN7;
 534                 break;
 535         default:
 536                 lcr = UART_LCR_WLEN8;
 537                 break;
 538         }
 539
 540         if (c_cflag & CSTOPB)
 541                 lcr |= UART_LCR_STOP;
 542         if (c_cflag & PARENB)
 543                 lcr |= UART_LCR_PARITY;
 544         if ((c_cflag & PARODD) != PARODD)
 545                 lcr |= UART_LCR_EPAR;
 546         if (c_cflag & CMSPAR)
 547                 lcr |= UART_LCR_SPAR;
 548
 549         baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
 550         quot = uart_get_divisor(port, baud);
 551
 552         fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
 553
 554         spin_lock_irqsave(&port->lock, flags);
 555
 556         uart_update_timeout(port, c_cflag, baud);
 557
 558         c_iflag = new->c_iflag;
 559
 560         port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
 561         if (c_iflag & INPCK)
 562                 port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 563         if (c_iflag & (IGNBRK | BRKINT | PARMRK))
 564                 port->read_status_mask |= UART_LSR_BI;
 565
 566         port->ignore_status_mask = 0;
 567         if (c_iflag & IGNPAR)
 568                 port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
 569         if (c_iflag & IGNBRK) {
 570                 port->ignore_status_mask |= UART_LSR_BI;
 571                 if (c_iflag & IGNPAR)
 572                         port->ignore_status_mask |= UART_LSR_OE;
 573         }
 574
 575         if ((c_cflag & CREAD) == 0)
 576                 port->ignore_status_mask |= UART_LSR_DR;
 577
 578         ier = siu_read(port, UART_IER);
 579         ier &= ~UART_IER_MSI;
 580         if (UART_ENABLE_MS(port, c_cflag))
 581                 ier |= UART_IER_MSI;
 582         siu_write(port, UART_IER, ier);
 583
 584         siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
 585
 586         siu_write(port, UART_DLL, (uint8_t)quot);
 587         siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
 588
 589         siu_write(port, UART_LCR, lcr);
 590
 591         siu_write(port, UART_FCR, fcr);
 592
 593         siu_set_mctrl(port, port->mctrl);
 594
 595         spin_unlock_irqrestore(&port->lock, flags);
 596 }
 597
 598 static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
 599 {
 600         switch (state) {
 601         case 0:
 602                 switch (port->type) {
 603                 case PORT_VR41XX_SIU:
 604                         vr41xx_supply_clock(SIU_CLOCK);
 605                         break;
 606                 case PORT_VR41XX_DSIU:
 607                         vr41xx_supply_clock(DSIU_CLOCK);
 608                         break;
 609                 }
 610                 break;
 611         case 3:
 612                 switch (port->type) {
 613                 case PORT_VR41XX_SIU:
 614                         vr41xx_mask_clock(SIU_CLOCK);
 615                         break;
 616                 case PORT_VR41XX_DSIU:
 617                         vr41xx_mask_clock(DSIU_CLOCK);
 618                         break;
 619                 }
 620                 break;
 621         }
 622 }
 623
 624 static const char *siu_type(struct uart_port *port)
 625 {
 626         return siu_type_name(port);
 627 }
 628
 629 static void siu_release_port(struct uart_port *port)
 630 {
 631         unsigned long size;
 632
 633         if (port->flags & UPF_IOREMAP) {
 634                 iounmap(port->membase);
 635                 port->membase = NULL;
 636         }
 637
 638         size = siu_port_size(port);
 639         release_mem_region(port->mapbase, size);
 640 }
 641
 642 static int siu_request_port(struct uart_port *port)
 643 {
 644         unsigned long size;
 645         struct resource *res;
 646
 647         size = siu_port_size(port);
 648         res = request_mem_region(port->mapbase, size, siu_type_name(port));
 649         if (res == NULL)
 650                 return -EBUSY;
 651
 652         if (port->flags & UPF_IOREMAP) {
 653                 port->membase = ioremap(port->mapbase, size);
 654                 if (port->membase == NULL) {
 655                         release_resource(res);
 656                         return -ENOMEM;
 657                 }
 658         }
 659
 660         return 0;
 661 }
 662
 663 static void siu_config_port(struct uart_port *port, int flags)
 664 {
 665         if (flags & UART_CONFIG_TYPE) {
 666                 port->type = siu_check_type(port);
 667                 (void)siu_request_port(port);
 668         }
 669 }
 670
 671 static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
 672 {
 673         if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
 674                 return -EINVAL;
 675         if (port->irq != serial->irq)
 676                 return -EINVAL;
 677         if (port->iotype != serial->io_type)
 678                 return -EINVAL;
 679         if (port->mapbase != (unsigned long)serial->iomem_base)
 680                 return -EINVAL;
 681
 682         return 0;
 683 }
 684
 685 static const struct uart_ops siu_uart_ops = {
 686         .tx_empty       = siu_tx_empty,
 687         .set_mctrl      = siu_set_mctrl,
 688         .get_mctrl      = siu_get_mctrl,
 689         .stop_tx        = siu_stop_tx,
 690         .start_tx       = siu_start_tx,
 691         .stop_rx        = siu_stop_rx,
 692         .enable_ms      = siu_enable_ms,
 693         .break_ctl      = siu_break_ctl,
 694         .startup        = siu_startup,
 695         .shutdown       = siu_shutdown,
 696         .set_termios    = siu_set_termios,
 697         .pm             = siu_pm,
 698         .type           = siu_type,
 699         .release_port   = siu_release_port,
 700         .request_port   = siu_request_port,
 701         .config_port    = siu_config_port,
 702         .verify_port    = siu_verify_port,
 703 };
 704
 705 static int siu_init_ports(struct platform_device *pdev)
 706 {
 707         struct uart_port *port;
 708         struct resource *res;
 709         int *type = dev_get_platdata(&pdev->dev);
 710         int i;
 711
 712         if (!type)
 713                 return 0;
 714
 715         port = siu_uart_ports;
 716         for (i = 0; i < SIU_PORTS_MAX; i++) {
 717                 port->type = type[i];
 718                 if (port->type == PORT_UNKNOWN)
 719                         continue;
 720                 port->irq = platform_get_irq(pdev, i);
 721                 port->uartclk = SIU_BAUD_BASE * 16;
 722                 port->fifosize = 16;
 723                 port->regshift = 0;
 724                 port->iotype = UPIO_MEM;
 725                 port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 726                 port->line = i;
 727                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 728                 port->mapbase = res->start;
 729                 port++;
 730         }
 731
 732         return i;
 733 }
 734
 735 #ifdef CONFIG_SERIAL_VR41XX_CONSOLE
 736
 737 #define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
 738
 739 static void wait_for_xmitr(struct uart_port *port)
 740 {
 741         int timeout = 10000;
 742         uint8_t lsr, msr;
 743
 744         do {
 745                 lsr = siu_read(port, UART_LSR);
 746                 if (lsr & UART_LSR_BI)
 747                         lsr_break_flag[port->line] = UART_LSR_BI;
 748
 749                 if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
 750                         break;
 751         } while (timeout-- > 0);
 752
 753         if (port->flags & UPF_CONS_FLOW) {
 754                 timeout = 1000000;
 755
 756                 do {
 757                         msr = siu_read(port, UART_MSR);
 758                         if ((msr & UART_MSR_CTS) != 0)
 759                                 break;
 760                 } while (timeout-- > 0);
 761         }
 762 }
 763
 764 static void siu_console_putchar(struct uart_port *port, int ch)
 765 {
 766         wait_for_xmitr(port);
 767         siu_write(port, UART_TX, ch);
 768 }
 769
 770 static void siu_console_write(struct console *con, const char *s, unsigned count)
 771 {
 772         struct uart_port *port;
 773         uint8_t ier;
 774
 775         port = &siu_uart_ports[con->index];
 776
 777         ier = siu_read(port, UART_IER);
 778         siu_write(port, UART_IER, 0);
 779
 780         uart_console_write(port, s, count, siu_console_putchar);
 781
 782         wait_for_xmitr(port);
 783         siu_write(port, UART_IER, ier);
 784 }
 785
 786 static int __init siu_console_setup(struct console *con, char *options)
 787 {
 788         struct uart_port *port;
 789         int baud = 9600;
 790         int parity = 'n';
 791         int bits = 8;
 792         int flow = 'n';
 793
 794         if (con->index >= SIU_PORTS_MAX)
 795                 con->index = 0;
 796
 797         port = &siu_uart_ports[con->index];
 798         if (port->membase == NULL) {
 799                 if (port->mapbase == 0)
 800                         return -ENODEV;
 801                 port->membase = ioremap(port->mapbase, siu_port_size(port));
 802         }
 803
 804         if (port->type == PORT_VR41XX_SIU)
 805                 vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
 806
 807         if (options != NULL)
 808                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 809
 810         return uart_set_options(port, con, baud, parity, bits, flow);
 811 }
 812
 813 static struct uart_driver siu_uart_driver;
 814
 815 static struct console siu_console = {
 816         .name   = "ttyVR",
 817         .write  = siu_console_write,
 818         .device = uart_console_device,
 819         .setup  = siu_console_setup,
 820         .flags  = CON_PRINTBUFFER,
 821         .index  = -1,
 822         .data   = &siu_uart_driver,
 823 };
 824
 825 static int siu_console_init(void)
 826 {
 827         struct uart_port *port;
 828         int i;
 829
 830         for (i = 0; i < SIU_PORTS_MAX; i++) {
 831                 port = &siu_uart_ports[i];
 832                 port->ops = &siu_uart_ops;
 833         }
 834
 835         register_console(&siu_console);
 836
 837         return 0;
 838 }
 839
 840 console_initcall(siu_console_init);
 841
 842 void __init vr41xx_siu_early_setup(struct uart_port *port)
 843 {
 844         if (port->type == PORT_UNKNOWN)
 845                 return;
 846
 847         siu_uart_ports[port->line].line = port->line;
 848         siu_uart_ports[port->line].type = port->type;
 849         siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
 850         siu_uart_ports[port->line].mapbase = port->mapbase;
 851         siu_uart_ports[port->line].ops = &siu_uart_ops;
 852 }
 853
 854 #define SERIAL_VR41XX_CONSOLE   &siu_console
 855 #else
 856 #define SERIAL_VR41XX_CONSOLE   NULL
 857 #endif
 858
 859 static struct uart_driver siu_uart_driver = {
 860         .owner          = THIS_MODULE,
 861         .driver_name    = "SIU",
 862         .dev_name       = "ttyVR",
 863         .major          = SIU_MAJOR,
 864         .minor          = SIU_MINOR_BASE,
 865         .cons           = SERIAL_VR41XX_CONSOLE,
 866 };
 867
 868 static int siu_probe(struct platform_device *dev)
 869 {
 870         struct uart_port *port;
 871         int num, i, retval;
 872
 873         num = siu_init_ports(dev);
 874         if (num <= 0)
 875                 return -ENODEV;
 876
 877         siu_uart_driver.nr = num;
 878         retval = uart_register_driver(&siu_uart_driver);
 879         if (retval)
 880                 return retval;
 881
 882         for (i = 0; i < num; i++) {
 883                 port = &siu_uart_ports[i];
 884                 port->ops = &siu_uart_ops;
 885                 port->dev = &dev->dev;
 886
 887                 retval = uart_add_one_port(&siu_uart_driver, port);
 888                 if (retval < 0) {
 889                         port->dev = NULL;
 890                         break;
 891                 }
 892         }
 893
 894         if (i == 0 && retval < 0) {
 895                 uart_unregister_driver(&siu_uart_driver);
 896                 return retval;
 897         }
 898
 899         return 0;
 900 }
 901
 902 static int siu_remove(struct platform_device *dev)
 903 {
 904         struct uart_port *port;
 905         int i;
 906
 907         for (i = 0; i < siu_uart_driver.nr; i++) {
 908                 port = &siu_uart_ports[i];
 909                 if (port->dev == &dev->dev) {
 910                         uart_remove_one_port(&siu_uart_driver, port);
 911                         port->dev = NULL;
 912                 }
 913         }
 914
 915         uart_unregister_driver(&siu_uart_driver);
 916
 917         return 0;
 918 }
 919
 920 static int siu_suspend(struct platform_device *dev, pm_message_t state)
 921 {
 922         struct uart_port *port;
 923         int i;
 924
 925         for (i = 0; i < siu_uart_driver.nr; i++) {
 926                 port = &siu_uart_ports[i];
 927                 if ((port->type == PORT_VR41XX_SIU ||
 928                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 929                         uart_suspend_port(&siu_uart_driver, port);
 930
 931         }
 932
 933         return 0;
 934 }
 935
 936 static int siu_resume(struct platform_device *dev)
 937 {
 938         struct uart_port *port;
 939         int i;
 940
 941         for (i = 0; i < siu_uart_driver.nr; i++) {
 942                 port = &siu_uart_ports[i];
 943                 if ((port->type == PORT_VR41XX_SIU ||
 944                      port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
 945                         uart_resume_port(&siu_uart_driver, port);
 946         }
 947
 948         return 0;
 949 }
 950
 951 static struct platform_driver siu_device_driver = {
 952         .probe          = siu_probe,
 953         .remove         = siu_remove,
 954         .suspend        = siu_suspend,
 955         .resume         = siu_resume,
 956         .driver         = {
 957                 .name   = "SIU",
 958         },
 959 };
 960
 961 module_platform_driver(siu_device_driver);
 962
 963 MODULE_LICENSE("GPL");
 964 MODULE_ALIAS("platform:SIU");