drivers/serial/sh-sci.c

   1 /*
   2  * drivers/serial/sh-sci.c
   3  *
   4  * SuperH on-chip serial module support.  (SCI with no FIFO / with FIFO)
   5  *
   6  *  Copyright (C) 2002, 2003, 2004  Paul Mundt
   7  *
   8  * based off of the old drivers/char/sh-sci.c by:
   9  *
  10  *   Copyright (C) 1999, 2000  Niibe Yutaka
  11  *   Copyright (C) 2000  Sugioka Toshinobu
  12  *   Modified to support multiple serial ports. Stuart Menefy (May 2000).
  13  *   Modified to support SecureEdge. David McCullough (2002)
  14  *   Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
  15  *
  16  * This file is subject to the terms and conditions of the GNU General Public
  17  * License.  See the file "COPYING" in the main directory of this archive
  18  * for more details.
  19  */
  20
  21 #undef DEBUG
  22
  23 #include <linux/config.h>
  24 #include <linux/module.h>
  25 #include <linux/errno.h>
  26 #include <linux/signal.h>
  27 #include <linux/sched.h>
  28 #include <linux/timer.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/serial.h>
  33 #include <linux/major.h>
  34 #include <linux/string.h>
  35 #include <linux/sysrq.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/ptrace.h>
  38 #include <linux/ioport.h>
  39 #include <linux/mm.h>
  40 #include <linux/slab.h>
  41 #include <linux/init.h>
  42 #include <linux/delay.h>
  43 #include <linux/console.h>
  44 #include <linux/bitops.h>
  45
  46 #ifdef CONFIG_CPU_FREQ
  47 #include <linux/notifier.h>
  48 #include <linux/cpufreq.h>
  49 #endif
  50
  51 #include <asm/system.h>
  52 #include <asm/io.h>
  53 #include <asm/irq.h>
  54 #include <asm/uaccess.h>
  55
  56 #include <linux/generic_serial.h>
  57
  58 #ifdef CONFIG_SH_STANDARD_BIOS
  59 #include <asm/sh_bios.h>
  60 #endif
  61
  62 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  63 #define SUPPORT_SYSRQ
  64 #endif
  65
  66 #include "sh-sci.h"
  67
  68 #ifdef CONFIG_SH_KGDB
  69 #include <asm/kgdb.h>
  70
  71 static int kgdb_get_char(struct sci_port *port);
  72 static void kgdb_put_char(struct sci_port *port, char c);
  73 static void kgdb_handle_error(struct sci_port *port);
  74 static struct sci_port *kgdb_sci_port;
  75 #endif /* CONFIG_SH_KGDB */
  76
  77 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
  78 static struct sci_port *serial_console_port = 0;
  79 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
  80
  81 /* Function prototypes */
  82 static void sci_stop_tx(struct uart_port *port);
  83 static void sci_start_tx(struct uart_port *port);
  84 static void sci_start_rx(struct uart_port *port, unsigned int tty_start);
  85 static void sci_stop_rx(struct uart_port *port);
  86 static int sci_request_irq(struct sci_port *port);
  87 static void sci_free_irq(struct sci_port *port);
  88
  89 static struct sci_port sci_ports[SCI_NPORTS];
  90 static struct uart_driver sci_uart_driver;
  91
  92 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
  93
  94 static void handle_error(struct uart_port *port)
  95 {                               /* Clear error flags */
  96         sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
  97 }
  98
  99 static int get_char(struct uart_port *port)
 100 {
 101         unsigned long flags;
 102         unsigned short status;
 103         int c;
 104
 105         local_irq_save(flags);
 106         do {
 107                 status = sci_in(port, SCxSR);
 108                 if (status & SCxSR_ERRORS(port)) {
 109                         handle_error(port);
 110                         continue;
 111                 }
 112         } while (!(status & SCxSR_RDxF(port)));
 113         c = sci_in(port, SCxRDR);
 114         sci_in(port, SCxSR);            /* Dummy read */
 115         sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 116         local_irq_restore(flags);
 117
 118         return c;
 119 }
 120
 121 /* Taken from sh-stub.c of GDB 4.18 */
 122 static const char hexchars[] = "0123456789abcdef";
 123
 124 static __inline__ char highhex(int  x)
 125 {
 126         return hexchars[(x >> 4) & 0xf];
 127 }
 128
 129 static __inline__ char lowhex(int  x)
 130 {
 131         return hexchars[x & 0xf];
 132 }
 133
 134 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
 135
 136 /*
 137  * Send the packet in buffer.  The host gets one chance to read it.
 138  * This routine does not wait for a positive acknowledge.
 139  */
 140
 141 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
 142 static void put_char(struct uart_port *port, char c)
 143 {
 144         unsigned long flags;
 145         unsigned short status;
 146
 147         local_irq_save(flags);
 148
 149         do {
 150                 status = sci_in(port, SCxSR);
 151         } while (!(status & SCxSR_TDxE(port)));
 152
 153         sci_out(port, SCxTDR, c);
 154         sci_in(port, SCxSR);            /* Dummy read */
 155         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 156
 157         local_irq_restore(flags);
 158 }
 159
 160 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
 161 {
 162         struct uart_port *port = &sci_port->port;
 163         const unsigned char *p = buffer;
 164         int i;
 165
 166 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
 167         int checksum;
 168         int usegdb=0;
 169
 170 #ifdef CONFIG_SH_STANDARD_BIOS
 171         /* This call only does a trap the first time it is
 172          * called, and so is safe to do here unconditionally
 173          */
 174         usegdb |= sh_bios_in_gdb_mode();
 175 #endif
 176 #ifdef CONFIG_SH_KGDB
 177         usegdb |= (kgdb_in_gdb_mode && (port == kgdb_sci_port));
 178 #endif
 179
 180         if (usegdb) {
 181             /*  $<packet info>#<checksum>. */
 182             do {
 183                 unsigned char c;
 184                 put_char(port, '$');
 185                 put_char(port, 'O'); /* 'O'utput to console */
 186                 checksum = 'O';
 187
 188                 for (i=0; i<count; i++) { /* Don't use run length encoding */
 189                         int h, l;
 190
 191                         c = *p++;
 192                         h = highhex(c);
 193                         l = lowhex(c);
 194                         put_char(port, h);
 195                         put_char(port, l);
 196                         checksum += h + l;
 197                 }
 198                 put_char(port, '#');
 199                 put_char(port, highhex(checksum));
 200                 put_char(port, lowhex(checksum));
 201             } while  (get_char(port) != '+');
 202         } else
 203 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
 204         for (i=0; i<count; i++) {
 205                 if (*p == 10)
 206                         put_char(port, '\r');
 207                 put_char(port, *p++);
 208         }
 209 }
 210 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
 211
 212
 213 #ifdef CONFIG_SH_KGDB
 214
 215 /* Is the SCI ready, ie is there a char waiting? */
 216 static int kgdb_is_char_ready(struct sci_port *port)
 217 {
 218         unsigned short status = sci_in(port, SCxSR);
 219
 220         if (status & (SCxSR_ERRORS(port) | SCxSR_BRK(port)))
 221                 kgdb_handle_error(port);
 222
 223         return (status & SCxSR_RDxF(port));
 224 }
 225
 226 /* Write a char */
 227 static void kgdb_put_char(struct sci_port *port, char c)
 228 {
 229         unsigned short status;
 230
 231         do
 232                 status = sci_in(port, SCxSR);
 233         while (!(status & SCxSR_TDxE(port)));
 234
 235         sci_out(port, SCxTDR, c);
 236         sci_in(port, SCxSR);    /* Dummy read */
 237         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 238 }
 239
 240 /* Get a char if there is one, else ret -1 */
 241 static int kgdb_get_char(struct sci_port *port)
 242 {
 243         int c;
 244
 245         if (kgdb_is_char_ready(port) == 0)
 246                 c = -1;
 247         else {
 248                 c = sci_in(port, SCxRDR);
 249                 sci_in(port, SCxSR);    /* Dummy read */
 250                 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 251         }
 252
 253         return c;
 254 }
 255
 256 /* Called from kgdbstub.c to get a character, i.e. is blocking */
 257 static int kgdb_sci_getchar(void)
 258 {
 259         volatile int c;
 260
 261         /* Keep trying to read a character, this could be neater */
 262         while ((c = kgdb_get_char(kgdb_sci_port)) < 0);
 263
 264         return c;
 265 }
 266
 267 /* Called from kgdbstub.c to put a character, just a wrapper */
 268 static void kgdb_sci_putchar(int c)
 269 {
 270
 271         kgdb_put_char(kgdb_sci_port, c);
 272 }
 273
 274 /* Clear any errors on the SCI */
 275 static void kgdb_handle_error(struct sci_port *port)
 276 {
 277         sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));  /* Clear error flags */
 278 }
 279
 280 /* Breakpoint if there's a break sent on the serial port */
 281 static void kgdb_break_interrupt(int irq, void *ptr, struct pt_regs *regs)
 282 {
 283         struct sci_port *port = ptr;
 284         unsigned short status = sci_in(port, SCxSR);
 285
 286         if (status & SCxSR_BRK(port)) {
 287
 288                 /* Break into the debugger if a break is detected */
 289                 BREAKPOINT();
 290
 291                 /* Clear */
 292                 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
 293         }
 294 }
 295
 296 #endif /* CONFIG_SH_KGDB */
 297
 298 #if defined(__H8300S__)
 299 enum { sci_disable, sci_enable };
 300
 301 static void h8300_sci_enable(struct uart_port* port, unsigned int ctrl)
 302 {
 303         volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
 304         int ch = (port->mapbase  - SMR0) >> 3;
 305         unsigned char mask = 1 << (ch+1);
 306
 307         if (ctrl == sci_disable) {
 308                 *mstpcrl |= mask;
 309         } else {
 310                 *mstpcrl &= ~mask;
 311         }
 312 }
 313 #endif
 314
 315 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF)
 316 #if defined(__H8300H__) || defined(__H8300S__)
 317 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
 318 {
 319         int ch = (port->mapbase - SMR0) >> 3;
 320
 321         /* set DDR regs */
 322         H8300_GPIO_DDR(h8300_sci_pins[ch].port,h8300_sci_pins[ch].rx,H8300_GPIO_INPUT);
 323         H8300_GPIO_DDR(h8300_sci_pins[ch].port,h8300_sci_pins[ch].tx,H8300_GPIO_OUTPUT);
 324         /* tx mark output*/
 325         H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
 326 }
 327 #else
 328 static void sci_init_pins_sci(struct uart_port *port, unsigned int cflag)
 329 {
 330 }
 331 #endif
 332 #endif
 333
 334 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
 335 #if defined(CONFIG_CPU_SH3)
 336 /* For SH7705, SH7707, SH7709, SH7709A, SH7729, SH7300*/
 337 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
 338 {
 339         unsigned int fcr_val = 0;
 340 #if !defined(CONFIG_CPU_SUBTYPE_SH7300) /* SH7300 doesn't use RTS/CTS */
 341         {
 342                 unsigned short data;
 343
 344                 /* We need to set SCPCR to enable RTS/CTS */
 345                 data = ctrl_inw(SCPCR);
 346                 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
 347                 ctrl_outw(data&0x0fcf, SCPCR);
 348         }
 349         if (cflag & CRTSCTS)
 350                 fcr_val |= SCFCR_MCE;
 351         else {
 352                 unsigned short data;
 353
 354                 /* We need to set SCPCR to enable RTS/CTS */
 355                 data = ctrl_inw(SCPCR);
 356                 /* Clear out SCP7MD1,0, SCP4MD1,0,
 357                    Set SCP6MD1,0 = {01} (output)  */
 358                 ctrl_outw((data&0x0fcf)|0x1000, SCPCR);
 359
 360                 data = ctrl_inb(SCPDR);
 361                 /* Set /RTS2 (bit6) = 0 */
 362                 ctrl_outb(data&0xbf, SCPDR);
 363         }
 364 #endif
 365         sci_out(port, SCFCR, fcr_val);
 366 }
 367
 368 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
 369 {
 370         unsigned int fcr_val = 0;
 371
 372         if (cflag & CRTSCTS)
 373                 fcr_val |= SCFCR_MCE;
 374
 375         sci_out(port, SCFCR, fcr_val);
 376 }
 377
 378 #else
 379
 380 /* For SH7750 */
 381 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
 382 {
 383         unsigned int fcr_val = 0;
 384
 385         if (cflag & CRTSCTS) {
 386                 fcr_val |= SCFCR_MCE;
 387         } else {
 388                 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
 389         }
 390         sci_out(port, SCFCR, fcr_val);
 391 }
 392
 393 #endif
 394 #endif /* SCIF_ONLY || SCI_AND_SCIF */
 395
 396 /* ********************************************************************** *
 397  *                   the interrupt related routines                       *
 398  * ********************************************************************** */
 399
 400 static void sci_transmit_chars(struct uart_port *port)
 401 {
 402         struct circ_buf *xmit = &port->info->xmit;
 403         unsigned int stopped = uart_tx_stopped(port);
 404         unsigned long flags;
 405         unsigned short status;
 406         unsigned short ctrl;
 407         int count, txroom;
 408
 409         status = sci_in(port, SCxSR);
 410         if (!(status & SCxSR_TDxE(port))) {
 411                 local_irq_save(flags);
 412                 ctrl = sci_in(port, SCSCR);
 413                 if (uart_circ_empty(xmit)) {
 414                         ctrl &= ~SCI_CTRL_FLAGS_TIE;
 415                 } else {
 416                         ctrl |= SCI_CTRL_FLAGS_TIE;
 417                 }
 418                 sci_out(port, SCSCR, ctrl);
 419                 local_irq_restore(flags);
 420                 return;
 421         }
 422
 423 #if !defined(SCI_ONLY)
 424         if (port->type == PORT_SCIF) {
 425                 txroom = SCIF_TXROOM_MAX - (sci_in(port, SCFDR)>>8);
 426         } else {
 427                 txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
 428         }
 429 #else
 430         txroom = (sci_in(port, SCxSR) & SCI_TDRE)?1:0;
 431 #endif
 432
 433         count = txroom;
 434
 435         do {
 436                 unsigned char c;
 437
 438                 if (port->x_char) {
 439                         c = port->x_char;
 440                         port->x_char = 0;
 441                 } else if (!uart_circ_empty(xmit) && !stopped) {
 442                         c = xmit->buf[xmit->tail];
 443                         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 444                 } else {
 445                         break;
 446                 }
 447
 448                 sci_out(port, SCxTDR, c);
 449
 450                 port->icount.tx++;
 451         } while (--count > 0);
 452
 453         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 454
 455         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 456                 uart_write_wakeup(port);
 457         if (uart_circ_empty(xmit)) {
 458                 sci_stop_tx(port);
 459         } else {
 460                 local_irq_save(flags);
 461                 ctrl = sci_in(port, SCSCR);
 462
 463 #if !defined(SCI_ONLY)
 464                 if (port->type == PORT_SCIF) {
 465                         sci_in(port, SCxSR); /* Dummy read */
 466                         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 467                 }
 468 #endif
 469
 470                 ctrl |= SCI_CTRL_FLAGS_TIE;
 471                 sci_out(port, SCSCR, ctrl);
 472                 local_irq_restore(flags);
 473         }
 474 }
 475
 476 /* On SH3, SCIF may read end-of-break as a space->mark char */
 477 #define STEPFN(c)  ({int __c=(c); (((__c-1)|(__c)) == -1); })
 478
 479 static inline void sci_receive_chars(struct uart_port *port,
 480                                      struct pt_regs *regs)
 481 {
 482         struct tty_struct *tty = port->info->tty;
 483         int i, count, copied = 0;
 484         unsigned short status;
 485
 486         status = sci_in(port, SCxSR);
 487         if (!(status & SCxSR_RDxF(port)))
 488                 return;
 489
 490         while (1) {
 491 #if !defined(SCI_ONLY)
 492                 if (port->type == PORT_SCIF) {
 493                         count = sci_in(port, SCFDR)&SCIF_RFDC_MASK ;
 494                 } else {
 495                         count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
 496                 }
 497 #else
 498                 count = (sci_in(port, SCxSR)&SCxSR_RDxF(port))?1:0;
 499 #endif
 500
 501                 /* Don't copy more bytes than there is room for in the buffer */
 502                 if (tty->flip.count + count > TTY_FLIPBUF_SIZE)
 503                         count = TTY_FLIPBUF_SIZE - tty->flip.count;
 504
 505                 /* If for any reason we can't copy more data, we're done! */
 506                 if (count == 0)
 507                         break;
 508
 509                 if (port->type == PORT_SCI) {
 510                         char c = sci_in(port, SCxRDR);
 511                        if(((struct sci_port *)port)->break_flag
 512                             || uart_handle_sysrq_char(port, c, regs)) {
 513                                 count = 0;
 514                         } else {
 515                             tty->flip.char_buf_ptr[0] = c;
 516                             tty->flip.flag_buf_ptr[0] = TTY_NORMAL;
 517                         }
 518                 } else {
 519                         for (i=0; i<count; i++) {
 520                                 char c = sci_in(port, SCxRDR);
 521                                 status = sci_in(port, SCxSR);
 522 #if defined(CONFIG_CPU_SH3)
 523                                 /* Skip "chars" during break */
 524                                 if (((struct sci_port *)port)->break_flag) {
 525                                         if ((c == 0) &&
 526                                             (status & SCxSR_FER(port))) {
 527                                                 count--; i--;
 528                                                 continue;
 529                                         }
 530                                         /* Nonzero => end-of-break */
 531                                         pr_debug("scif: debounce<%02x>\n", c);
 532                                         ((struct sci_port *)port)->break_flag = 0;
 533                                         if (STEPFN(c)) {
 534                                                 count--; i--;
 535                                                 continue;
 536                                         }
 537                                 }
 538 #endif /* CONFIG_CPU_SH3 */
 539                                 if (uart_handle_sysrq_char(port, c, regs)) {
 540                                         count--; i--;
 541                                         continue;
 542                                 }
 543
 544                                 /* Store data and status */
 545                                 tty->flip.char_buf_ptr[i] = c;
 546                                 if (status&SCxSR_FER(port)) {
 547                                         tty->flip.flag_buf_ptr[i] = TTY_FRAME;
 548                                         pr_debug("sci: frame error\n");
 549                                 } else if (status&SCxSR_PER(port)) {
 550                                         tty->flip.flag_buf_ptr[i] = TTY_PARITY;
 551                                         pr_debug("sci: parity error\n");
 552                                 } else {
 553                                         tty->flip.flag_buf_ptr[i] = TTY_NORMAL;
 554                                 }
 555                         }
 556                 }
 557
 558                 sci_in(port, SCxSR); /* dummy read */
 559                 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 560
 561                 /* Update the kernel buffer end */
 562                 tty->flip.count += count;
 563                 tty->flip.char_buf_ptr += count;
 564                 tty->flip.flag_buf_ptr += count;
 565                 copied += count;
 566                 port->icount.rx += count;
 567         }
 568
 569         if (copied) {
 570                 /* Tell the rest of the system the news. New characters! */
 571                 tty_flip_buffer_push(tty);
 572         } else {
 573                 sci_in(port, SCxSR); /* dummy read */
 574                 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 575         }
 576 }
 577
 578 #define SCI_BREAK_JIFFIES (HZ/20)
 579 /* The sci generates interrupts during the break,
 580  * 1 per millisecond or so during the break period, for 9600 baud.
 581  * So dont bother disabling interrupts.
 582  * But dont want more than 1 break event.
 583  * Use a kernel timer to periodically poll the rx line until
 584  * the break is finished.
 585  */
 586 static void sci_schedule_break_timer(struct sci_port *port)
 587 {
 588         port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
 589         add_timer(&port->break_timer);
 590 }
 591 /* Ensure that two consecutive samples find the break over. */
 592 static void sci_break_timer(unsigned long data)
 593 {
 594     struct sci_port * port = (struct sci_port *)data;
 595         if(sci_rxd_in(&port->port) == 0) {
 596                 port->break_flag = 1;
 597             sci_schedule_break_timer(port);
 598         } else if(port->break_flag == 1){
 599                 /* break is over. */
 600                 port->break_flag = 2;
 601             sci_schedule_break_timer(port);
 602         } else port->break_flag = 0;
 603 }
 604
 605 static inline int sci_handle_errors(struct uart_port *port)
 606 {
 607         int copied = 0;
 608         unsigned short status = sci_in(port, SCxSR);
 609         struct tty_struct *tty = port->info->tty;
 610
 611         if (status&SCxSR_ORER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
 612                 /* overrun error */
 613                 copied++;
 614                 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
 615                 pr_debug("sci: overrun error\n");
 616         }
 617
 618         if (status&SCxSR_FER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
 619                 if (sci_rxd_in(port) == 0) {
 620                         /* Notify of BREAK */
 621                         struct sci_port * sci_port = (struct sci_port *)port;
 622                        if(!sci_port->break_flag) {
 623                                 sci_port->break_flag = 1;
 624                                sci_schedule_break_timer((struct sci_port *)port);
 625                                 /* Do sysrq handling. */
 626                                 if(uart_handle_break(port)) {
 627                                         return 0;
 628                                 }
 629                                 pr_debug("sci: BREAK detected\n");
 630                                 copied++;
 631                                 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
 632                        }
 633                 }
 634                 else {
 635                         /* frame error */
 636                         copied++;
 637                         *tty->flip.flag_buf_ptr++ = TTY_FRAME;
 638                         pr_debug("sci: frame error\n");
 639                 }
 640         }
 641
 642         if (status&SCxSR_PER(port) && tty->flip.count<TTY_FLIPBUF_SIZE) {
 643                 /* parity error */
 644                 copied++;
 645                 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
 646                 pr_debug("sci: parity error\n");
 647         }
 648
 649         if (copied) {
 650                 tty->flip.count += copied;
 651                 tty_flip_buffer_push(tty);
 652         }
 653
 654         return copied;
 655 }
 656
 657 static inline int sci_handle_breaks(struct uart_port *port)
 658 {
 659         int copied = 0;
 660         unsigned short status = sci_in(port, SCxSR);
 661         struct tty_struct *tty = port->info->tty;
 662         struct sci_port *s = &sci_ports[port->line];
 663
 664         if (!s->break_flag && status & SCxSR_BRK(port) &&
 665             tty->flip.count < TTY_FLIPBUF_SIZE) {
 666 #if defined(CONFIG_CPU_SH3)
 667                 /* Debounce break */
 668                 s->break_flag = 1;
 669 #endif
 670                 /* Notify of BREAK */
 671                 copied++;
 672                 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
 673                 pr_debug("sci: BREAK detected\n");
 674         }
 675
 676 #if defined(SCIF_ORER)
 677         /* XXX: Handle SCIF overrun error */
 678         if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
 679                 sci_out(port, SCLSR, 0);
 680                 if(tty->flip.count<TTY_FLIPBUF_SIZE) {
 681                         copied++;
 682                         *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
 683                         pr_debug("sci: overrun error\n");
 684                 }
 685         }
 686 #endif
 687
 688         if (copied) {
 689                 tty->flip.count += copied;
 690                 tty_flip_buffer_push(tty);
 691         }
 692
 693         return copied;
 694 }
 695
 696 static irqreturn_t sci_rx_interrupt(int irq, void *ptr, struct pt_regs *regs)
 697 {
 698         struct uart_port *port = ptr;
 699
 700         /* I think sci_receive_chars has to be called irrespective
 701          * of whether the I_IXOFF is set, otherwise, how is the interrupt
 702          * to be disabled?
 703          */
 704         sci_receive_chars(port, regs);
 705
 706         return IRQ_HANDLED;
 707 }
 708
 709 static irqreturn_t sci_tx_interrupt(int irq, void *ptr, struct pt_regs *regs)
 710 {
 711         struct uart_port *port = ptr;
 712
 713         sci_transmit_chars(port);
 714
 715         return IRQ_HANDLED;
 716 }
 717
 718 static irqreturn_t sci_er_interrupt(int irq, void *ptr, struct pt_regs *regs)
 719 {
 720         struct uart_port *port = ptr;
 721
 722         /* Handle errors */
 723         if (port->type == PORT_SCI) {
 724                 if (sci_handle_errors(port)) {
 725                         /* discard character in rx buffer */
 726                         sci_in(port, SCxSR);
 727                         sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 728                 }
 729         } else {
 730 #if defined(SCIF_ORER)
 731                 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
 732                         struct tty_struct *tty = port->info->tty;
 733
 734                         sci_out(port, SCLSR, 0);
 735                         if(tty->flip.count<TTY_FLIPBUF_SIZE) {
 736                                 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
 737                                 tty->flip.count++;
 738                                 tty_flip_buffer_push(tty);
 739                                 pr_debug("scif: overrun error\n");
 740                         }
 741                 }
 742 #endif
 743                 sci_rx_interrupt(irq, ptr, regs);
 744         }
 745
 746         sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
 747
 748         /* Kick the transmission */
 749         sci_tx_interrupt(irq, ptr, regs);
 750
 751         return IRQ_HANDLED;
 752 }
 753
 754 static irqreturn_t sci_br_interrupt(int irq, void *ptr, struct pt_regs *regs)
 755 {
 756         struct uart_port *port = ptr;
 757
 758         /* Handle BREAKs */
 759         sci_handle_breaks(port);
 760         sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
 761
 762         return IRQ_HANDLED;
 763 }
 764
 765 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr, struct pt_regs *regs)
 766 {
 767         unsigned short ssr_status, scr_status;
 768         struct uart_port *port = ptr;
 769
 770         ssr_status = sci_in(port,SCxSR);
 771         scr_status = sci_in(port,SCSCR);
 772
 773         /* Tx Interrupt */
 774         if ((ssr_status&0x0020) && (scr_status&0x0080))
 775                 sci_tx_interrupt(irq, ptr, regs);
 776         /* Rx Interrupt */
 777         if ((ssr_status&0x0002) && (scr_status&0x0040))
 778                 sci_rx_interrupt(irq, ptr, regs);
 779         /* Error Interrupt */
 780         if ((ssr_status&0x0080) && (scr_status&0x0400))
 781                 sci_er_interrupt(irq, ptr, regs);
 782         /* Break Interrupt */
 783         if ((ssr_status&0x0010) && (scr_status&0x0200))
 784                 sci_br_interrupt(irq, ptr, regs);
 785
 786         return IRQ_HANDLED;
 787 }
 788
 789 #ifdef CONFIG_CPU_FREQ
 790 /*
 791  * Here we define a transistion notifier so that we can update all of our
 792  * ports' baud rate when the peripheral clock changes.
 793  */
 794 static int sci_notifier(struct notifier_block *self, unsigned long phase, void *p)
 795 {
 796         struct cpufreq_freqs *freqs = p;
 797         int i;
 798
 799         if ((phase == CPUFREQ_POSTCHANGE) ||
 800             (phase == CPUFREQ_RESUMECHANGE)){
 801                 for (i = 0; i < SCI_NPORTS; i++) {
 802                         struct uart_port *port = &sci_ports[i].port;
 803
 804                         /*
 805                          * Update the uartclk per-port if frequency has
 806                          * changed, since it will no longer necessarily be
 807                          * consistent with the old frequency.
 808                          *
 809                          * Really we want to be able to do something like
 810                          * uart_change_speed() or something along those lines
 811                          * here to implicitly reset the per-port baud rate..
 812                          *
 813                          * Clean this up later..
 814                          */
 815                         port->uartclk = current_cpu_data.module_clock * 16;
 816                 }
 817
 818                 printk("%s: got a postchange notification for cpu %d (old %d, new %d)\n",
 819                                 __FUNCTION__, freqs->cpu, freqs->old, freqs->new);
 820         }
 821
 822         return NOTIFY_OK;
 823 }
 824
 825 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
 826 #endif /* CONFIG_CPU_FREQ */
 827
 828 static int sci_request_irq(struct sci_port *port)
 829 {
 830         int i;
 831         irqreturn_t (*handlers[4])(int irq, void *ptr, struct pt_regs *regs) = {
 832                 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
 833                 sci_br_interrupt,
 834         };
 835         const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
 836                                "SCI Transmit Data Empty", "SCI Break" };
 837
 838         if (port->irqs[0] == port->irqs[1]) {
 839                 if (!port->irqs[0]) {
 840                         printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
 841                         return -ENODEV;
 842                 }
 843                 if (request_irq(port->irqs[0], sci_mpxed_interrupt, SA_INTERRUPT,
 844                                 "sci", port)) {
 845                         printk(KERN_ERR "sci: Cannot allocate irq.\n");
 846                         return -ENODEV;
 847                 }
 848         } else {
 849                 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
 850                         if (!port->irqs[i])
 851                                 continue;
 852                         if (request_irq(port->irqs[i], handlers[i], SA_INTERRUPT,
 853                                         desc[i], port)) {
 854                                 printk(KERN_ERR "sci: Cannot allocate irq.\n");
 855                                 return -ENODEV;
 856                         }
 857                 }
 858         }
 859
 860         return 0;
 861 }
 862
 863 static void sci_free_irq(struct sci_port *port)
 864 {
 865         int i;
 866
 867         if (port->irqs[0] == port->irqs[1]) {
 868                 if (!port->irqs[0])
 869                         printk("sci: sci_free_irq error\n");
 870                 else
 871                         free_irq(port->irqs[0], port);
 872         } else {
 873                 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
 874                         if (!port->irqs[i])
 875                                 continue;
 876
 877                         free_irq(port->irqs[i], port);
 878                 }
 879         }
 880 }
 881
 882 static unsigned int sci_tx_empty(struct uart_port *port)
 883 {
 884         /* Can't detect */
 885         return TIOCSER_TEMT;
 886 }
 887
 888 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
 889 {
 890         /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
 891         /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
 892         /* If you have signals for DTR and DCD, please implement here. */
 893 }
 894
 895 static unsigned int sci_get_mctrl(struct uart_port *port)
 896 {
 897         /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
 898            and CTS/RTS */
 899
 900         return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
 901 }
 902
 903 static void sci_start_tx(struct uart_port *port)
 904 {
 905         struct sci_port *s = &sci_ports[port->line];
 906
 907         disable_irq(s->irqs[SCIx_TXI_IRQ]);
 908         sci_transmit_chars(port);
 909         enable_irq(s->irqs[SCIx_TXI_IRQ]);
 910 }
 911
 912 static void sci_stop_tx(struct uart_port *port)
 913 {
 914         unsigned long flags;
 915         unsigned short ctrl;
 916
 917         /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
 918         local_irq_save(flags);
 919         ctrl = sci_in(port, SCSCR);
 920         ctrl &= ~SCI_CTRL_FLAGS_TIE;
 921         sci_out(port, SCSCR, ctrl);
 922         local_irq_restore(flags);
 923 }
 924
 925 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
 926 {
 927         unsigned long flags;
 928         unsigned short ctrl;
 929
 930         /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
 931         local_irq_save(flags);
 932         ctrl = sci_in(port, SCSCR);
 933         ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
 934         sci_out(port, SCSCR, ctrl);
 935         local_irq_restore(flags);
 936 }
 937
 938 static void sci_stop_rx(struct uart_port *port)
 939 {
 940         unsigned long flags;
 941         unsigned short ctrl;
 942
 943         /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
 944         local_irq_save(flags);
 945         ctrl = sci_in(port, SCSCR);
 946         ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
 947         sci_out(port, SCSCR, ctrl);
 948         local_irq_restore(flags);
 949 }
 950
 951 static void sci_enable_ms(struct uart_port *port)
 952 {
 953         /* Nothing here yet .. */
 954 }
 955
 956 static void sci_break_ctl(struct uart_port *port, int break_state)
 957 {
 958         /* Nothing here yet .. */
 959 }
 960
 961 static int sci_startup(struct uart_port *port)
 962 {
 963         struct sci_port *s = &sci_ports[port->line];
 964
 965 #if defined(__H8300S__)
 966         h8300_sci_enable(port, sci_enable);
 967 #endif
 968
 969         sci_request_irq(s);
 970         sci_start_tx(port);
 971         sci_start_rx(port, 1);
 972
 973         return 0;
 974 }
 975
 976 static void sci_shutdown(struct uart_port *port)
 977 {
 978         struct sci_port *s = &sci_ports[port->line];
 979
 980         sci_stop_rx(port);
 981         sci_stop_tx(port);
 982         sci_free_irq(s);
 983
 984 #if defined(__H8300S__)
 985         h8300_sci_enable(port, sci_disable);
 986 #endif
 987 }
 988
 989 static void sci_set_termios(struct uart_port *port, struct termios *termios,
 990                             struct termios *old)
 991 {
 992         struct sci_port *s = &sci_ports[port->line];
 993         unsigned int status, baud, smr_val;
 994         unsigned long flags;
 995         int t;
 996
 997         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 998
 999         spin_lock_irqsave(&port->lock, flags);
1000
1001         do {
1002                 status = sci_in(port, SCxSR);
1003         } while (!(status & SCxSR_TEND(port)));
1004
1005         sci_out(port, SCSCR, 0x00);     /* TE=0, RE=0, CKE1=0 */
1006
1007 #if !defined(SCI_ONLY)
1008         if (port->type == PORT_SCIF) {
1009                 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1010         }
1011 #endif
1012
1013         smr_val = sci_in(port, SCSMR) & 3;
1014         if ((termios->c_cflag & CSIZE) == CS7)
1015                 smr_val |= 0x40;
1016         if (termios->c_cflag & PARENB)
1017                 smr_val |= 0x20;
1018         if (termios->c_cflag & PARODD)
1019                 smr_val |= 0x30;
1020         if (termios->c_cflag & CSTOPB)
1021                 smr_val |= 0x08;
1022
1023         uart_update_timeout(port, termios->c_cflag, baud);
1024
1025         sci_out(port, SCSMR, smr_val);
1026
1027         switch (baud) {
1028                 case 0:         t = -1;         break;
1029                 case 2400:      t = BPS_2400;   break;
1030                 case 4800:      t = BPS_4800;   break;
1031                 case 9600:      t = BPS_9600;   break;
1032                 case 19200:     t = BPS_19200;  break;
1033                 case 38400:     t = BPS_38400;  break;
1034                 case 57600:     t = BPS_57600;  break;
1035                 case 115200:    t = BPS_115200; break;
1036                 default:        t = SCBRR_VALUE(baud); break;
1037         }
1038
1039         if (t > 0) {
1040                 if(t >= 256) {
1041                         sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1042                         t >>= 2;
1043                 } else {
1044                         sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1045                 }
1046                 sci_out(port, SCBRR, t);
1047                 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1048         }
1049
1050         s->init_pins(port, termios->c_cflag);
1051         sci_out(port, SCSCR, SCSCR_INIT(port));
1052
1053         if ((termios->c_cflag & CREAD) != 0)
1054               sci_start_rx(port,0);
1055
1056         spin_unlock_irqrestore(&port->lock, flags);
1057 }
1058
1059 static const char *sci_type(struct uart_port *port)
1060 {
1061         switch (port->type) {
1062                 case PORT_SCI:  return "sci";
1063                 case PORT_SCIF: return "scif";
1064                 case PORT_IRDA: return "irda";
1065         }
1066
1067         return 0;
1068 }
1069
1070 static void sci_release_port(struct uart_port *port)
1071 {
1072         /* Nothing here yet .. */
1073 }
1074
1075 static int sci_request_port(struct uart_port *port)
1076 {
1077         /* Nothing here yet .. */
1078         return 0;
1079 }
1080
1081 static void sci_config_port(struct uart_port *port, int flags)
1082 {
1083         struct sci_port *s = &sci_ports[port->line];
1084
1085         port->type = s->type;
1086
1087 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1088         if (port->mapbase == 0)
1089                 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1090
1091         port->membase = (void *)port->mapbase;
1092 #endif
1093 }
1094
1095 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1096 {
1097         struct sci_port *s = &sci_ports[port->line];
1098
1099         if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1100                 return -EINVAL;
1101         if (ser->baud_base < 2400)
1102                 /* No paper tape reader for Mitch.. */
1103                 return -EINVAL;
1104
1105         return 0;
1106 }
1107
1108 static struct uart_ops sci_uart_ops = {
1109         .tx_empty       = sci_tx_empty,
1110         .set_mctrl      = sci_set_mctrl,
1111         .get_mctrl      = sci_get_mctrl,
1112         .start_tx       = sci_start_tx,
1113         .stop_tx        = sci_stop_tx,
1114         .stop_rx        = sci_stop_rx,
1115         .enable_ms      = sci_enable_ms,
1116         .break_ctl      = sci_break_ctl,
1117         .startup        = sci_startup,
1118         .shutdown       = sci_shutdown,
1119         .set_termios    = sci_set_termios,
1120         .type           = sci_type,
1121         .release_port   = sci_release_port,
1122         .request_port   = sci_request_port,
1123         .config_port    = sci_config_port,
1124         .verify_port    = sci_verify_port,
1125 };
1126
1127 static struct sci_port sci_ports[SCI_NPORTS] = {
1128 #if defined(CONFIG_CPU_SUBTYPE_SH7708)
1129         {
1130                 .port   = {
1131                         .membase        = (void *)0xfffffe80,
1132                         .mapbase        = 0xfffffe80,
1133                         .iotype         = SERIAL_IO_MEM,
1134                         .irq            = 25,
1135                         .ops            = &sci_uart_ops,
1136                         .flags          = ASYNC_BOOT_AUTOCONF,
1137                         .line           = 0,
1138                 },
1139                 .type           = PORT_SCI,
1140                 .irqs           = SCI_IRQS,
1141                 .init_pins      = sci_init_pins_sci,
1142         },
1143 #elif defined(CONFIG_CPU_SUBTYPE_SH7705)
1144         {
1145                 .port   = {
1146                         .membase        = (void *)SCIF0,
1147                         .mapbase        = SCIF0,
1148                         .iotype         = SERIAL_IO_MEM,
1149                         .irq            = 55,
1150                         .ops            = &sci_uart_ops,
1151                         .flags          = ASYNC_BOOT_AUTOCONF,
1152                         .line           = 0,
1153                 },
1154                 .type           = PORT_SCIF,
1155                 .irqs           = SH3_IRDA_IRQS,
1156                 .init_pins      = sci_init_pins_scif,
1157         },
1158         {
1159                 .port   = {
1160                         .membase        = (void *)SCIF2,
1161                         .mapbase        = SCIF2,
1162                         .iotype         = SERIAL_IO_MEM,
1163                         .irq            = 59,
1164                         .ops            = &sci_uart_ops,
1165                         .flags          = ASYNC_BOOT_AUTOCONF,
1166                         .line           = 1,
1167                 },
1168                 .type           = PORT_SCIF,
1169                 .irqs           = SH3_SCIF_IRQS,
1170                 .init_pins      = sci_init_pins_scif,
1171         }
1172 #elif defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
1173         {
1174                 .port   = {
1175                         .membase        = (void *)0xfffffe80,
1176                         .mapbase        = 0xfffffe80,
1177                         .iotype         = SERIAL_IO_MEM,
1178                         .irq            = 25,
1179                         .ops            = &sci_uart_ops,
1180                         .flags          = ASYNC_BOOT_AUTOCONF,
1181                         .line           = 0,
1182                 },
1183                 .type           = PORT_SCI,
1184                 .irqs           = SCI_IRQS,
1185                 .init_pins      = sci_init_pins_sci,
1186         },
1187         {
1188                 .port   = {
1189                         .membase        = (void *)0xa4000150,
1190                         .mapbase        = 0xa4000150,
1191                         .iotype         = SERIAL_IO_MEM,
1192                         .irq            = 59,
1193                         .ops            = &sci_uart_ops,
1194                         .flags          = ASYNC_BOOT_AUTOCONF,
1195                         .line           = 1,
1196                 },
1197                 .type           = PORT_SCIF,
1198                 .irqs           = SH3_SCIF_IRQS,
1199                 .init_pins      = sci_init_pins_scif,
1200         },
1201         {
1202                 .port   = {
1203                         .membase        = (void *)0xa4000140,
1204                         .mapbase        = 0xa4000140,
1205                         .iotype         = SERIAL_IO_MEM,
1206                         .irq            = 55,
1207                         .ops            = &sci_uart_ops,
1208                         .flags          = ASYNC_BOOT_AUTOCONF,
1209                         .line           = 2,
1210                 },
1211                 .type           = PORT_IRDA,
1212                 .irqs           = SH3_IRDA_IRQS,
1213                 .init_pins      = sci_init_pins_irda,
1214         }
1215 #elif defined(CONFIG_CPU_SUBTYPE_SH7300)
1216         {
1217                 .port   = {
1218                         .membase        = (void *)0xA4430000,
1219                         .mapbase        = 0xA4430000,
1220                         .iotype         = SERIAL_IO_MEM,
1221                         .irq            = 25,
1222                         .ops            = &sci_uart_ops,
1223                         .flags          = ASYNC_BOOT_AUTOCONF,
1224                         .line           = 0,
1225                 },
1226                 .type           = PORT_SCIF,
1227                 .irqs           = SH7300_SCIF0_IRQS,
1228                 .init_pins      = sci_init_pins_scif,
1229         },
1230 #elif defined(CONFIG_CPU_SUBTYPE_SH73180)
1231         {
1232                 .port   = {
1233                         .membase        = (void *)0xffe00000,
1234                         .mapbase        = 0xffe00000,
1235                         .iotype         = SERIAL_IO_MEM,
1236                         .irq            = 25,
1237                         .ops            = &sci_uart_ops,
1238                         .flags          = ASYNC_BOOT_AUTOCONF,
1239                         .line           = 0,
1240                 },
1241                 .type           = PORT_SCIF,
1242                 .irqs           = SH73180_SCIF_IRQS,
1243                 .init_pins      = sci_init_pins_scif,
1244         },
1245 #elif defined(CONFIG_SH_RTS7751R2D)
1246         {
1247                 .port   = {
1248                         .membase        = (void *)0xffe80000,
1249                         .mapbase        = 0xffe80000,
1250                         .iotype         = SERIAL_IO_MEM,
1251                         .irq            = 43,
1252                         .ops            = &sci_uart_ops,
1253                         .flags          = ASYNC_BOOT_AUTOCONF,
1254                         .line           = 0,
1255                 },
1256                 .type           = PORT_SCIF,
1257                 .irqs           = SH4_SCIF_IRQS,
1258                 .init_pins      = sci_init_pins_scif,
1259         },
1260 #elif defined(CONFIG_CPU_SUBTYPE_SH7750) || defined(CONFIG_CPU_SUBTYPE_SH7751)
1261         {
1262                 .port   = {
1263                         .membase        = (void *)0xffe00000,
1264                         .mapbase        = 0xffe00000,
1265                         .iotype         = SERIAL_IO_MEM,
1266                         .irq            = 25,
1267                         .ops            = &sci_uart_ops,
1268                         .flags          = ASYNC_BOOT_AUTOCONF,
1269                         .line           = 0,
1270                 },
1271                 .type           = PORT_SCI,
1272                 .irqs           = SCI_IRQS,
1273                 .init_pins      = sci_init_pins_sci,
1274         },
1275         {
1276                 .port   = {
1277                         .membase        = (void *)0xffe80000,
1278                         .mapbase        = 0xffe80000,
1279                         .iotype         = SERIAL_IO_MEM,
1280                         .irq            = 43,
1281                         .ops            = &sci_uart_ops,
1282                         .flags          = ASYNC_BOOT_AUTOCONF,
1283                         .line           = 1,
1284                 },
1285                 .type           = PORT_SCIF,
1286                 .irqs           = SH4_SCIF_IRQS,
1287                 .init_pins      = sci_init_pins_scif,
1288         },
1289 #elif defined(CONFIG_CPU_SUBTYPE_SH7760)
1290         {
1291                 .port   = {
1292                         .membase        = (void *)0xfe600000,
1293                         .mapbase        = 0xfe600000,
1294                         .iotype         = SERIAL_IO_MEM,
1295                         .irq            = 55,
1296                         .ops            = &sci_uart_ops,
1297                         .flags          = ASYNC_BOOT_AUTOCONF,
1298                         .line           = 0,
1299                 },
1300                 .type           = PORT_SCIF,
1301                 .irqs           = SH7760_SCIF0_IRQS,
1302                 .init_pins      = sci_init_pins_scif,
1303         },
1304         {
1305                 .port   = {
1306                         .membase        = (void *)0xfe610000,
1307                         .mapbase        = 0xfe610000,
1308                         .iotype         = SERIAL_IO_MEM,
1309                         .irq            = 75,
1310                         .ops            = &sci_uart_ops,
1311                         .flags          = ASYNC_BOOT_AUTOCONF,
1312                         .line           = 1,
1313                 },
1314                 .type           = PORT_SCIF,
1315                 .irqs           = SH7760_SCIF1_IRQS,
1316                 .init_pins      = sci_init_pins_scif,
1317         },
1318         {
1319                 .port   = {
1320                         .membase        = (void *)0xfe620000,
1321                         .mapbase        = 0xfe620000,
1322                         .iotype         = SERIAL_IO_MEM,
1323                         .irq            = 79,
1324                         .ops            = &sci_uart_ops,
1325                         .flags          = ASYNC_BOOT_AUTOCONF,
1326                         .line           = 2,
1327                 },
1328                 .type           = PORT_SCIF,
1329                 .irqs           = SH7760_SCIF2_IRQS,
1330                 .init_pins      = sci_init_pins_scif,
1331         },
1332 #elif defined(CONFIG_CPU_SUBTYPE_SH4_202)
1333         {
1334                 .port   = {
1335                         .membase        = (void *)0xffe80000,
1336                         .mapbase        = 0xffe80000,
1337                         .iotype         = SERIAL_IO_MEM,
1338                         .irq            = 43,
1339                         .ops            = &sci_uart_ops,
1340                         .flags          = ASYNC_BOOT_AUTOCONF,
1341                         .line           = 0,
1342                 },
1343                 .type           = PORT_SCIF,
1344                 .irqs           = SH4_SCIF_IRQS,
1345                 .init_pins      = sci_init_pins_scif,
1346         },
1347 #elif defined(CONFIG_CPU_SUBTYPE_ST40STB1)
1348         {
1349                 .port   = {
1350                         .membase        = (void *)0xffe00000,
1351                         .mapbase        = 0xffe00000,
1352                         .iotype         = SERIAL_IO_MEM,
1353                         .irq            = 26,
1354                         .ops            = &sci_uart_ops,
1355                         .flags          = ASYNC_BOOT_AUTOCONF,
1356                         .line           = 0,
1357                 },
1358                 .type           = PORT_SCIF,
1359                 .irqs           = STB1_SCIF1_IRQS,
1360                 .init_pins      = sci_init_pins_scif,
1361         },
1362         {
1363                 .port   = {
1364                         .membase        = (void *)0xffe80000,
1365                         .mapbase        = 0xffe80000,
1366                         .iotype         = SERIAL_IO_MEM,
1367                         .irq            = 43,
1368                         .ops            = &sci_uart_ops,
1369                         .flags          = ASYNC_BOOT_AUTOCONF,
1370                         .line           = 1,
1371                 },
1372                 .type           = PORT_SCIF,
1373                 .irqs           = SH4_SCIF_IRQS,
1374                 .init_pins      = sci_init_pins_scif,
1375         },
1376 #elif defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1377         {
1378                 .port   = {
1379                         .iotype         = SERIAL_IO_MEM,
1380                         .irq            = 42,
1381                         .ops            = &sci_uart_ops,
1382                         .flags          = ASYNC_BOOT_AUTOCONF,
1383                         .line           = 0,
1384                 },
1385                 .type           = PORT_SCIF,
1386                 .irqs           = SH5_SCIF_IRQS,
1387                 .init_pins      = sci_init_pins_scif,
1388         },
1389 #elif defined(CONFIG_H83007) || defined(CONFIG_H83068)
1390         {
1391                 .port   = {
1392                         .membase        = (void *)0x00ffffb0,
1393                         .mapbase        = 0x00ffffb0,
1394                         .iotype         = SERIAL_IO_MEM,
1395                         .irq            = 54,
1396                         .ops            = &sci_uart_ops,
1397                         .flags          = ASYNC_BOOT_AUTOCONF,
1398                         .line           = 0,
1399                 },
1400                 .type           = PORT_SCI,
1401                 .irqs           = H8300H_SCI_IRQS0,
1402                 .init_pins      = sci_init_pins_sci,
1403         },
1404         {
1405                 .port   = {
1406                         .membase        = (void *)0x00ffffb8,
1407                         .mapbase        = 0x00ffffb8,
1408                         .iotype         = SERIAL_IO_MEM,
1409                         .irq            = 58,
1410                         .ops            = &sci_uart_ops,
1411                         .flags          = ASYNC_BOOT_AUTOCONF,
1412                         .line           = 1,
1413                 },
1414                 .type           = PORT_SCI,
1415                 .irqs           = H8300H_SCI_IRQS1,
1416                 .init_pins      = sci_init_pins_sci,
1417         },
1418         {
1419                 .port   = {
1420                         .membase        = (void *)0x00ffffc0,
1421                         .mapbase        = 0x00ffffc0,
1422                         .iotype         = SERIAL_IO_MEM,
1423                         .irq            = 62,
1424                         .ops            = &sci_uart_ops,
1425                         .flags          = ASYNC_BOOT_AUTOCONF,
1426                         .line           = 2,
1427                 },
1428                 .type           = PORT_SCI,
1429                 .irqs           = H8300H_SCI_IRQS2,
1430                 .init_pins      = sci_init_pins_sci,
1431         },
1432 #elif defined(CONFIG_H8S2678)
1433         {
1434                 .port   = {
1435                         .membase        = (void *)0x00ffff78,
1436                         .mapbase        = 0x00ffff78,
1437                         .iotype         = SERIAL_IO_MEM,
1438                         .irq            = 90,
1439                         .ops            = &sci_uart_ops,
1440                         .flags          = ASYNC_BOOT_AUTOCONF,
1441                         .line           = 0,
1442                 },
1443                 .type           = PORT_SCI,
1444                 .irqs           = H8S_SCI_IRQS0,
1445                 .init_pins      = sci_init_pins_sci,
1446         },
1447         {
1448                 .port   = {
1449                         .membase        = (void *)0x00ffff80,
1450                         .mapbase        = 0x00ffff80,
1451                         .iotype         = SERIAL_IO_MEM,
1452                         .irq            = 94,
1453                         .ops            = &sci_uart_ops,
1454                         .flags          = ASYNC_BOOT_AUTOCONF,
1455                         .line           = 1,
1456                 },
1457                 .type           = PORT_SCI,
1458                 .irqs           = H8S_SCI_IRQS1,
1459                 .init_pins      = sci_init_pins_sci,
1460         },
1461         {
1462                 .port   = {
1463                         .membase        = (void *)0x00ffff88,
1464                         .mapbase        = 0x00ffff88,
1465                         .iotype         = SERIAL_IO_MEM,
1466                         .irq            = 98,
1467                         .ops            = &sci_uart_ops,
1468                         .flags          = ASYNC_BOOT_AUTOCONF,
1469                         .line           = 2,
1470                 },
1471                 .type           = PORT_SCI,
1472                 .irqs           = H8S_SCI_IRQS2,
1473                 .init_pins      = sci_init_pins_sci,
1474         },
1475 #else
1476 #error "CPU subtype not defined"
1477 #endif
1478 };
1479
1480 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1481 /*
1482  *      Print a string to the serial port trying not to disturb
1483  *      any possible real use of the port...
1484  */
1485 static void serial_console_write(struct console *co, const char *s,
1486                                  unsigned count)
1487 {
1488         put_string(serial_console_port, s, count);
1489 }
1490
1491 static int __init serial_console_setup(struct console *co, char *options)
1492 {
1493         struct uart_port *port;
1494         int baud = 115200;
1495         int bits = 8;
1496         int parity = 'n';
1497         int flow = 'n';
1498         int ret;
1499
1500         if (co->index >= SCI_NPORTS)
1501                 co->index = 0;
1502
1503         serial_console_port = &sci_ports[co->index];
1504         port = &serial_console_port->port;
1505         port->type = serial_console_port->type;
1506
1507 #ifdef CONFIG_SUPERH64
1508         /* This is especially needed on sh64 to remap the SCIF */
1509         sci_config_port(port, 0);
1510 #endif
1511
1512         /*
1513          * We need to set the initial uartclk here, since otherwise it will
1514          * only ever be setup at sci_init() time.
1515          */
1516 #if !defined(__H8300H__) && !defined(__H8300S__)
1517         port->uartclk = current_cpu_data.module_clock * 16;
1518 #else
1519         port->uartclk = CONFIG_CPU_CLOCK;
1520 #endif
1521 #if defined(__H8300S__)
1522         h8300_sci_enable(port, sci_enable);
1523 #endif
1524         if (options)
1525                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1526
1527         ret = uart_set_options(port, co, baud, parity, bits, flow);
1528 #if defined(__H8300H__) || defined(__H8300S__)
1529         /* disable rx interrupt */
1530         if (ret == 0)
1531                 sci_stop_rx(port);
1532 #endif
1533         return ret;
1534 }
1535
1536 static struct console serial_console = {
1537         .name           = "ttySC",
1538         .device         = uart_console_device,
1539         .write          = serial_console_write,
1540         .setup          = serial_console_setup,
1541         .flags          = CON_PRINTBUFFER,
1542         .index          = -1,
1543         .data           = &sci_uart_driver,
1544 };
1545
1546 static int __init sci_console_init(void)
1547 {
1548         register_console(&serial_console);
1549         return 0;
1550 }
1551
1552 console_initcall(sci_console_init);
1553 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1554
1555 #ifdef CONFIG_SH_KGDB
1556 /*
1557  * FIXME: Most of this can go away.. at the moment, we rely on
1558  * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1559  * most of that can easily be done here instead.
1560  *
1561  * For the time being, just accept the values that were parsed earlier..
1562  */
1563 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1564                                             int *parity, int *bits)
1565 {
1566         *baud = kgdb_baud;
1567         *parity = tolower(kgdb_parity);
1568         *bits = kgdb_bits - '0';
1569 }
1570
1571 /*
1572  * The naming here is somewhat misleading, since kgdb_console_setup() takes
1573  * care of the early-on initialization for kgdb, regardless of whether we
1574  * actually use kgdb as a console or not.
1575  *
1576  * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1577  */
1578 int __init kgdb_console_setup(struct console *co, char *options)
1579 {
1580         struct uart_port *port = &sci_ports[kgdb_portnum].port;
1581         int baud = 38400;
1582         int bits = 8;
1583         int parity = 'n';
1584         int flow = 'n';
1585
1586         if (co->index >= SCI_NPORTS || co->index != kgdb_portnum)
1587                 co->index = kgdb_portnum;
1588
1589         if (options)
1590                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1591         else
1592                 kgdb_console_get_options(port, &baud, &parity, &bits);
1593
1594         kgdb_getchar = kgdb_sci_getchar;
1595         kgdb_putchar = kgdb_sci_putchar;
1596
1597         return uart_set_options(port, co, baud, parity, bits, flow);
1598 }
1599 #endif /* CONFIG_SH_KGDB */
1600
1601 #ifdef CONFIG_SH_KGDB_CONSOLE
1602 static struct console kgdb_console = {
1603         .name           = "ttySC",
1604         .write          = kgdb_console_write,
1605         .setup          = kgdb_console_setup,
1606         .flags          = CON_PRINTBUFFER | CON_ENABLED,
1607         .index          = -1,
1608         .data           = &sci_uart_driver,
1609 };
1610
1611 /* Register the KGDB console so we get messages (d'oh!) */
1612 static int __init kgdb_console_init(void)
1613 {
1614         register_console(&kgdb_console);
1615         return 0;
1616 }
1617
1618 console_initcall(kgdb_console_init);
1619 #endif /* CONFIG_SH_KGDB_CONSOLE */
1620
1621 #if defined(CONFIG_SH_KGDB_CONSOLE)
1622 #define SCI_CONSOLE     &kgdb_console
1623 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1624 #define SCI_CONSOLE     &serial_console
1625 #else
1626 #define SCI_CONSOLE     0
1627 #endif
1628
1629 static char banner[] __initdata =
1630         KERN_INFO "SuperH SCI(F) driver initialized\n";
1631
1632 static struct uart_driver sci_uart_driver = {
1633         .owner          = THIS_MODULE,
1634         .driver_name    = "sci",
1635 #ifdef CONFIG_DEVFS_FS
1636         .devfs_name     = "ttsc/",
1637 #endif
1638         .dev_name       = "ttySC",
1639         .major          = SCI_MAJOR,
1640         .minor          = SCI_MINOR_START,
1641         .nr             = SCI_NPORTS,
1642         .cons           = SCI_CONSOLE,
1643 };
1644
1645 static int __init sci_init(void)
1646 {
1647         int chan, ret;
1648
1649         printk("%s", banner);
1650
1651         ret = uart_register_driver(&sci_uart_driver);
1652         if (ret == 0) {
1653                 for (chan = 0; chan < SCI_NPORTS; chan++) {
1654                         struct sci_port *sciport = &sci_ports[chan];
1655
1656 #if !defined(__H8300H__) && !defined(__H8300S__)
1657                         sciport->port.uartclk = (current_cpu_data.module_clock * 16);
1658 #else
1659                         sciport->port.uartclk = CONFIG_CPU_CLOCK;
1660 #endif
1661                         uart_add_one_port(&sci_uart_driver, &sciport->port);
1662                         sciport->break_timer.data = (unsigned long)sciport;
1663                         sciport->break_timer.function = sci_break_timer;
1664                         init_timer(&sciport->break_timer);
1665                 }
1666         }
1667
1668 #ifdef CONFIG_CPU_FREQ
1669         cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1670         printk("sci: CPU frequency notifier registered\n");
1671 #endif
1672
1673 #ifdef CONFIG_SH_STANDARD_BIOS
1674         sh_bios_gdb_detach();
1675 #endif
1676
1677         return ret;
1678 }
1679
1680 static void __exit sci_exit(void)
1681 {
1682         int chan;
1683
1684         for (chan = 0; chan < SCI_NPORTS; chan++)
1685                 uart_remove_one_port(&sci_uart_driver, &sci_ports[chan].port);
1686
1687         uart_unregister_driver(&sci_uart_driver);
1688 }
1689
1690 module_init(sci_init);
1691 module_exit(sci_exit);
1692