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 - 2006  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 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  21 #define SUPPORT_SYSRQ
  22 #endif
  23
  24 #undef DEBUG
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.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/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/init.h>
  39 #include <linux/delay.h>
  40 #include <linux/console.h>
  41 #include <linux/platform_device.h>
  42
  43 #ifdef CONFIG_CPU_FREQ
  44 #include <linux/notifier.h>
  45 #include <linux/cpufreq.h>
  46 #endif
  47
  48 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
  49 #include <linux/ctype.h>
  50 #include <asm/clock.h>
  51 #include <asm/sh_bios.h>
  52 #include <asm/kgdb.h>
  53 #endif
  54
  55 #include <asm/sci.h>
  56 #include "sh-sci.h"
  57
  58 struct sci_port {
  59         struct uart_port        port;
  60
  61         /* Port type */
  62         unsigned int            type;
  63
  64         /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
  65         unsigned int            irqs[SCIx_NR_IRQS];
  66
  67         /* Port pin configuration */
  68         void                    (*init_pins)(struct uart_port *port,
  69                                              unsigned int cflag);
  70
  71         /* Port enable callback */
  72         void                    (*enable)(struct uart_port *port);
  73
  74         /* Port disable callback */
  75         void                    (*disable)(struct uart_port *port);
  76
  77         /* Break timer */
  78         struct timer_list       break_timer;
  79         int                     break_flag;
  80 };
  81
  82 #ifdef CONFIG_SH_KGDB
  83 static struct sci_port *kgdb_sci_port;
  84 #endif
  85
  86 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
  87 static struct sci_port *serial_console_port;
  88 #endif
  89
  90 /* Function prototypes */
  91 static void sci_stop_tx(struct uart_port *port);
  92
  93 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
  94
  95 static struct sci_port sci_ports[SCI_NPORTS];
  96 static struct uart_driver sci_uart_driver;
  97
  98 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \
  99     defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
 100 static inline void handle_error(struct uart_port *port)
 101 {
 102         /* Clear error flags */
 103         sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
 104 }
 105
 106 static int get_char(struct uart_port *port)
 107 {
 108         unsigned long flags;
 109         unsigned short status;
 110         int c;
 111
 112         spin_lock_irqsave(&port->lock, flags);
 113         do {
 114                 status = sci_in(port, SCxSR);
 115                 if (status & SCxSR_ERRORS(port)) {
 116                         handle_error(port);
 117                         continue;
 118                 }
 119         } while (!(status & SCxSR_RDxF(port)));
 120         c = sci_in(port, SCxRDR);
 121         sci_in(port, SCxSR);            /* Dummy read */
 122         sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 123         spin_unlock_irqrestore(&port->lock, flags);
 124
 125         return c;
 126 }
 127 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
 128
 129 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB)
 130 static void put_char(struct uart_port *port, char c)
 131 {
 132         unsigned long flags;
 133         unsigned short status;
 134
 135         spin_lock_irqsave(&port->lock, flags);
 136
 137         do {
 138                 status = sci_in(port, SCxSR);
 139         } while (!(status & SCxSR_TDxE(port)));
 140
 141         sci_out(port, SCxTDR, c);
 142         sci_in(port, SCxSR);            /* Dummy read */
 143         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 144
 145         spin_unlock_irqrestore(&port->lock, flags);
 146 }
 147 #endif
 148
 149 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
 150 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
 151 {
 152         struct uart_port *port = &sci_port->port;
 153         const unsigned char *p = buffer;
 154         int i;
 155
 156 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
 157         int checksum;
 158         int usegdb=0;
 159
 160 #ifdef CONFIG_SH_STANDARD_BIOS
 161         /* This call only does a trap the first time it is
 162          * called, and so is safe to do here unconditionally
 163          */
 164         usegdb |= sh_bios_in_gdb_mode();
 165 #endif
 166 #ifdef CONFIG_SH_KGDB
 167         usegdb |= (kgdb_in_gdb_mode && (sci_port == kgdb_sci_port));
 168 #endif
 169
 170         if (usegdb) {
 171             /*  $<packet info>#<checksum>. */
 172             do {
 173                 unsigned char c;
 174                 put_char(port, '$');
 175                 put_char(port, 'O'); /* 'O'utput to console */
 176                 checksum = 'O';
 177
 178                 for (i=0; i<count; i++) { /* Don't use run length encoding */
 179                         int h, l;
 180
 181                         c = *p++;
 182                         h = highhex(c);
 183                         l = lowhex(c);
 184                         put_char(port, h);
 185                         put_char(port, l);
 186                         checksum += h + l;
 187                 }
 188                 put_char(port, '#');
 189                 put_char(port, highhex(checksum));
 190                 put_char(port, lowhex(checksum));
 191             } while  (get_char(port) != '+');
 192         } else
 193 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
 194         for (i=0; i<count; i++) {
 195                 if (*p == 10)
 196                         put_char(port, '\r');
 197                 put_char(port, *p++);
 198         }
 199 }
 200 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
 201
 202 #ifdef CONFIG_SH_KGDB
 203 static int kgdb_sci_getchar(void)
 204 {
 205         int c;
 206
 207         /* Keep trying to read a character, this could be neater */
 208         while ((c = get_char(&kgdb_sci_port->port)) < 0)
 209                 cpu_relax();
 210
 211         return c;
 212 }
 213
 214 static inline void kgdb_sci_putchar(int c)
 215 {
 216         put_char(&kgdb_sci_port->port, c);
 217 }
 218 #endif /* CONFIG_SH_KGDB */
 219
 220 #if defined(__H8300S__)
 221 enum { sci_disable, sci_enable };
 222
 223 static void h8300_sci_config(struct uart_port* port, unsigned int ctrl)
 224 {
 225         volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
 226         int ch = (port->mapbase  - SMR0) >> 3;
 227         unsigned char mask = 1 << (ch+1);
 228
 229         if (ctrl == sci_disable) {
 230                 *mstpcrl |= mask;
 231         } else {
 232                 *mstpcrl &= ~mask;
 233         }
 234 }
 235
 236 static inline void h8300_sci_enable(struct uart_port *port)
 237 {
 238         h8300_sci_config(port, sci_enable);
 239 }
 240
 241 static inline void h8300_sci_disable(struct uart_port *port)
 242 {
 243         h8300_sci_config(port, sci_disable);
 244 }
 245 #endif
 246
 247 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \
 248     defined(__H8300H__) || defined(__H8300S__)
 249 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
 250 {
 251         int ch = (port->mapbase - SMR0) >> 3;
 252
 253         /* set DDR regs */
 254         H8300_GPIO_DDR(h8300_sci_pins[ch].port,
 255                        h8300_sci_pins[ch].rx,
 256                        H8300_GPIO_INPUT);
 257         H8300_GPIO_DDR(h8300_sci_pins[ch].port,
 258                        h8300_sci_pins[ch].tx,
 259                        H8300_GPIO_OUTPUT);
 260
 261         /* tx mark output*/
 262         H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
 263 }
 264 #else
 265 #define sci_init_pins_sci NULL
 266 #endif
 267
 268 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
 269 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
 270 {
 271         unsigned int fcr_val = 0;
 272
 273         if (cflag & CRTSCTS)
 274                 fcr_val |= SCFCR_MCE;
 275
 276         sci_out(port, SCFCR, fcr_val);
 277 }
 278 #else
 279 #define sci_init_pins_irda NULL
 280 #endif
 281
 282 #ifdef SCI_ONLY
 283 #define sci_init_pins_scif NULL
 284 #endif
 285
 286 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
 287 #if defined(CONFIG_CPU_SUBTYPE_SH7300)
 288 /* SH7300 doesn't use RTS/CTS */
 289 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
 290 {
 291         sci_out(port, SCFCR, 0);
 292 }
 293 #elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
 294 static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag)
 295 {
 296         unsigned int fcr_val = 0;
 297
 298         set_sh771x_scif_pfc(port);
 299         if (cflag & CRTSCTS) {
 300                 fcr_val |= SCFCR_MCE;
 301         }
 302         sci_out(port, SCFCR, fcr_val);
 303 }
 304 #elif defined(CONFIG_CPU_SH3)
 305 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
 306 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
 307 {
 308         unsigned int fcr_val = 0;
 309         unsigned short data;
 310
 311         /* We need to set SCPCR to enable RTS/CTS */
 312         data = ctrl_inw(SCPCR);
 313         /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
 314         ctrl_outw(data & 0x0fcf, SCPCR);
 315
 316         if (cflag & CRTSCTS)
 317                 fcr_val |= SCFCR_MCE;
 318         else {
 319                 /* We need to set SCPCR to enable RTS/CTS */
 320                 data = ctrl_inw(SCPCR);
 321                 /* Clear out SCP7MD1,0, SCP4MD1,0,
 322                    Set SCP6MD1,0 = {01} (output)  */
 323                 ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR);
 324
 325                 data = ctrl_inb(SCPDR);
 326                 /* Set /RTS2 (bit6) = 0 */
 327                 ctrl_outb(data & 0xbf, SCPDR);
 328         }
 329
 330         sci_out(port, SCFCR, fcr_val);
 331 }
 332 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
 333 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
 334 {
 335         unsigned int fcr_val = 0;
 336
 337         if (cflag & CRTSCTS) {
 338                 fcr_val |= SCFCR_MCE;
 339
 340                 ctrl_outw(0x0000, PORT_PSCR);
 341         } else {
 342                 unsigned short data;
 343
 344                 data = ctrl_inw(PORT_PSCR);
 345                 data &= 0x033f;
 346                 data |= 0x0400;
 347                 ctrl_outw(data, PORT_PSCR);
 348
 349                 ctrl_outw(ctrl_inw(SCSPTR0) & 0x17, SCSPTR0);
 350         }
 351
 352         sci_out(port, SCFCR, fcr_val);
 353 }
 354 #else
 355 /* For SH7750 */
 356 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
 357 {
 358         unsigned int fcr_val = 0;
 359
 360         if (cflag & CRTSCTS) {
 361                 fcr_val |= SCFCR_MCE;
 362         } else {
 363 #ifdef CONFIG_CPU_SUBTYPE_SH7343
 364                 /* Nothing */
 365 #elif defined(CONFIG_CPU_SUBTYPE_SH7780) || defined(CONFIG_CPU_SUBTYPE_SH7785)
 366                 ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */
 367 #else
 368                 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
 369 #endif
 370         }
 371         sci_out(port, SCFCR, fcr_val);
 372 }
 373 #endif
 374
 375 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
 376     defined(CONFIG_CPU_SUBTYPE_SH7780) || \
 377     defined(CONFIG_CPU_SUBTYPE_SH7785)
 378 static inline int scif_txroom(struct uart_port *port)
 379 {
 380         return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0x7f);
 381 }
 382
 383 static inline int scif_rxroom(struct uart_port *port)
 384 {
 385         return sci_in(port, SCRFDR) & 0x7f;
 386 }
 387 #else
 388 static inline int scif_txroom(struct uart_port *port)
 389 {
 390         return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
 391 }
 392
 393 static inline int scif_rxroom(struct uart_port *port)
 394 {
 395         return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
 396 }
 397 #endif
 398 #endif /* SCIF_ONLY || SCI_AND_SCIF */
 399
 400 static inline int sci_txroom(struct uart_port *port)
 401 {
 402         return ((sci_in(port, SCxSR) & SCI_TDRE) != 0);
 403 }
 404
 405 static inline int sci_rxroom(struct uart_port *port)
 406 {
 407         return ((sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0);
 408 }
 409
 410 /* ********************************************************************** *
 411  *                   the interrupt related routines                       *
 412  * ********************************************************************** */
 413
 414 static void sci_transmit_chars(struct uart_port *port)
 415 {
 416         struct circ_buf *xmit = &port->info->xmit;
 417         unsigned int stopped = uart_tx_stopped(port);
 418         unsigned short status;
 419         unsigned short ctrl;
 420         int count;
 421
 422         status = sci_in(port, SCxSR);
 423         if (!(status & SCxSR_TDxE(port))) {
 424                 ctrl = sci_in(port, SCSCR);
 425                 if (uart_circ_empty(xmit)) {
 426                         ctrl &= ~SCI_CTRL_FLAGS_TIE;
 427                 } else {
 428                         ctrl |= SCI_CTRL_FLAGS_TIE;
 429                 }
 430                 sci_out(port, SCSCR, ctrl);
 431                 return;
 432         }
 433
 434 #ifndef SCI_ONLY
 435         if (port->type == PORT_SCIF)
 436                 count = scif_txroom(port);
 437         else
 438 #endif
 439                 count = sci_txroom(port);
 440
 441         do {
 442                 unsigned char c;
 443
 444                 if (port->x_char) {
 445                         c = port->x_char;
 446                         port->x_char = 0;
 447                 } else if (!uart_circ_empty(xmit) && !stopped) {
 448                         c = xmit->buf[xmit->tail];
 449                         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 450                 } else {
 451                         break;
 452                 }
 453
 454                 sci_out(port, SCxTDR, c);
 455
 456                 port->icount.tx++;
 457         } while (--count > 0);
 458
 459         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 460
 461         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 462                 uart_write_wakeup(port);
 463         if (uart_circ_empty(xmit)) {
 464                 sci_stop_tx(port);
 465         } else {
 466                 ctrl = sci_in(port, SCSCR);
 467
 468 #if !defined(SCI_ONLY)
 469                 if (port->type == PORT_SCIF) {
 470                         sci_in(port, SCxSR); /* Dummy read */
 471                         sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
 472                 }
 473 #endif
 474
 475                 ctrl |= SCI_CTRL_FLAGS_TIE;
 476                 sci_out(port, SCSCR, ctrl);
 477         }
 478 }
 479
 480 /* On SH3, SCIF may read end-of-break as a space->mark char */
 481 #define STEPFN(c)  ({int __c=(c); (((__c-1)|(__c)) == -1); })
 482
 483 static inline void sci_receive_chars(struct uart_port *port)
 484 {
 485         struct sci_port *sci_port = (struct sci_port *)port;
 486         struct tty_struct *tty = port->info->tty;
 487         int i, count, copied = 0;
 488         unsigned short status;
 489         unsigned char flag;
 490
 491         status = sci_in(port, SCxSR);
 492         if (!(status & SCxSR_RDxF(port)))
 493                 return;
 494
 495         while (1) {
 496 #if !defined(SCI_ONLY)
 497                 if (port->type == PORT_SCIF)
 498                         count = scif_rxroom(port);
 499                 else
 500 #endif
 501                         count = sci_rxroom(port);
 502
 503                 /* Don't copy more bytes than there is room for in the buffer */
 504                 count = tty_buffer_request_room(tty, count);
 505
 506                 /* If for any reason we can't copy more data, we're done! */
 507                 if (count == 0)
 508                         break;
 509
 510                 if (port->type == PORT_SCI) {
 511                         char c = sci_in(port, SCxRDR);
 512                         if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
 513                                 count = 0;
 514                         else {
 515                                 tty_insert_flip_char(tty, c, TTY_NORMAL);
 516                         }
 517                 } else {
 518                         for (i=0; i<count; i++) {
 519                                 char c = sci_in(port, SCxRDR);
 520                                 status = sci_in(port, SCxSR);
 521 #if defined(CONFIG_CPU_SH3)
 522                                 /* Skip "chars" during break */
 523                                 if (sci_port->break_flag) {
 524                                         if ((c == 0) &&
 525                                             (status & SCxSR_FER(port))) {
 526                                                 count--; i--;
 527                                                 continue;
 528                                         }
 529
 530                                         /* Nonzero => end-of-break */
 531                                         pr_debug("scif: debounce<%02x>\n", c);
 532                                         sci_port->break_flag = 0;
 533
 534                                         if (STEPFN(c)) {
 535                                                 count--; i--;
 536                                                 continue;
 537                                         }
 538                                 }
 539 #endif /* CONFIG_CPU_SH3 */
 540                                 if (uart_handle_sysrq_char(port, c)) {
 541                                         count--; i--;
 542                                         continue;
 543                                 }
 544
 545                                 /* Store data and status */
 546                                 if (status&SCxSR_FER(port)) {
 547                                         flag = TTY_FRAME;
 548                                         pr_debug("sci: frame error\n");
 549                                 } else if (status&SCxSR_PER(port)) {
 550                                         flag = TTY_PARITY;
 551                                         pr_debug("sci: parity error\n");
 552                                 } else
 553                                         flag = TTY_NORMAL;
 554                                 tty_insert_flip_char(tty, c, flag);
 555                         }
 556                 }
 557
 558                 sci_in(port, SCxSR); /* dummy read */
 559                 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 560
 561                 copied += count;
 562                 port->icount.rx += count;
 563         }
 564
 565         if (copied) {
 566                 /* Tell the rest of the system the news. New characters! */
 567                 tty_flip_buffer_push(tty);
 568         } else {
 569                 sci_in(port, SCxSR); /* dummy read */
 570                 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 571         }
 572 }
 573
 574 #define SCI_BREAK_JIFFIES (HZ/20)
 575 /* The sci generates interrupts during the break,
 576  * 1 per millisecond or so during the break period, for 9600 baud.
 577  * So dont bother disabling interrupts.
 578  * But dont want more than 1 break event.
 579  * Use a kernel timer to periodically poll the rx line until
 580  * the break is finished.
 581  */
 582 static void sci_schedule_break_timer(struct sci_port *port)
 583 {
 584         port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
 585         add_timer(&port->break_timer);
 586 }
 587 /* Ensure that two consecutive samples find the break over. */
 588 static void sci_break_timer(unsigned long data)
 589 {
 590         struct sci_port *port = (struct sci_port *)data;
 591
 592         if (sci_rxd_in(&port->port) == 0) {
 593                 port->break_flag = 1;
 594                 sci_schedule_break_timer(port);
 595         } else if (port->break_flag == 1) {
 596                 /* break is over. */
 597                 port->break_flag = 2;
 598                 sci_schedule_break_timer(port);
 599         } else
 600                 port->break_flag = 0;
 601 }
 602
 603 static inline int sci_handle_errors(struct uart_port *port)
 604 {
 605         int copied = 0;
 606         unsigned short status = sci_in(port, SCxSR);
 607         struct tty_struct *tty = port->info->tty;
 608
 609         if (status & SCxSR_ORER(port)) {
 610                 /* overrun error */
 611                 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
 612                         copied++;
 613                 pr_debug("sci: overrun error\n");
 614         }
 615
 616         if (status & SCxSR_FER(port)) {
 617                 if (sci_rxd_in(port) == 0) {
 618                         /* Notify of BREAK */
 619                         struct sci_port *sci_port = (struct sci_port *)port;
 620
 621                         if (!sci_port->break_flag) {
 622                                 sci_port->break_flag = 1;
 623                                 sci_schedule_break_timer(sci_port);
 624
 625                                 /* Do sysrq handling. */
 626                                 if (uart_handle_break(port))
 627                                         return 0;
 628                                 pr_debug("sci: BREAK detected\n");
 629                                 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
 630                                         copied++;
 631                        }
 632                 } else {
 633                         /* frame error */
 634                         if (tty_insert_flip_char(tty, 0, TTY_FRAME))
 635                                 copied++;
 636                         pr_debug("sci: frame error\n");
 637                 }
 638         }
 639
 640         if (status & SCxSR_PER(port)) {
 641                 /* parity error */
 642                 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
 643                         copied++;
 644                 pr_debug("sci: parity error\n");
 645         }
 646
 647         if (copied)
 648                 tty_flip_buffer_push(tty);
 649
 650         return copied;
 651 }
 652
 653 static inline int sci_handle_breaks(struct uart_port *port)
 654 {
 655         int copied = 0;
 656         unsigned short status = sci_in(port, SCxSR);
 657         struct tty_struct *tty = port->info->tty;
 658         struct sci_port *s = &sci_ports[port->line];
 659
 660         if (uart_handle_break(port))
 661                 return 0;
 662
 663         if (!s->break_flag && status & SCxSR_BRK(port)) {
 664 #if defined(CONFIG_CPU_SH3)
 665                 /* Debounce break */
 666                 s->break_flag = 1;
 667 #endif
 668                 /* Notify of BREAK */
 669                 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
 670                         copied++;
 671                 pr_debug("sci: BREAK detected\n");
 672         }
 673
 674 #if defined(SCIF_ORER)
 675         /* XXX: Handle SCIF overrun error */
 676         if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
 677                 sci_out(port, SCLSR, 0);
 678                 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
 679                         copied++;
 680                         pr_debug("sci: overrun error\n");
 681                 }
 682         }
 683 #endif
 684
 685         if (copied)
 686                 tty_flip_buffer_push(tty);
 687
 688         return copied;
 689 }
 690
 691 static irqreturn_t sci_rx_interrupt(int irq, void *port)
 692 {
 693         /* I think sci_receive_chars has to be called irrespective
 694          * of whether the I_IXOFF is set, otherwise, how is the interrupt
 695          * to be disabled?
 696          */
 697         sci_receive_chars(port);
 698
 699         return IRQ_HANDLED;
 700 }
 701
 702 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
 703 {
 704         struct uart_port *port = ptr;
 705
 706         spin_lock_irq(&port->lock);
 707         sci_transmit_chars(port);
 708         spin_unlock_irq(&port->lock);
 709
 710         return IRQ_HANDLED;
 711 }
 712
 713 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
 714 {
 715         struct uart_port *port = ptr;
 716
 717         /* Handle errors */
 718         if (port->type == PORT_SCI) {
 719                 if (sci_handle_errors(port)) {
 720                         /* discard character in rx buffer */
 721                         sci_in(port, SCxSR);
 722                         sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
 723                 }
 724         } else {
 725 #if defined(SCIF_ORER)
 726                 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
 727                         struct tty_struct *tty = port->info->tty;
 728
 729                         sci_out(port, SCLSR, 0);
 730                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 731                         tty_flip_buffer_push(tty);
 732                         pr_debug("scif: overrun error\n");
 733                 }
 734 #endif
 735                 sci_rx_interrupt(irq, ptr);
 736         }
 737
 738         sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
 739
 740         /* Kick the transmission */
 741         sci_tx_interrupt(irq, ptr);
 742
 743         return IRQ_HANDLED;
 744 }
 745
 746 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
 747 {
 748         struct uart_port *port = ptr;
 749
 750         /* Handle BREAKs */
 751         sci_handle_breaks(port);
 752         sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
 753
 754         return IRQ_HANDLED;
 755 }
 756
 757 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
 758 {
 759         unsigned short ssr_status, scr_status;
 760         struct uart_port *port = ptr;
 761
 762         ssr_status = sci_in(port,SCxSR);
 763         scr_status = sci_in(port,SCSCR);
 764
 765         /* Tx Interrupt */
 766         if ((ssr_status & 0x0020) && (scr_status & 0x0080))
 767                 sci_tx_interrupt(irq, ptr);
 768         /* Rx Interrupt */
 769         if ((ssr_status & 0x0002) && (scr_status & 0x0040))
 770                 sci_rx_interrupt(irq, ptr);
 771         /* Error Interrupt */
 772         if ((ssr_status & 0x0080) && (scr_status & 0x0400))
 773                 sci_er_interrupt(irq, ptr);
 774         /* Break Interrupt */
 775         if ((ssr_status & 0x0010) && (scr_status & 0x0200))
 776                 sci_br_interrupt(irq, ptr);
 777
 778         return IRQ_HANDLED;
 779 }
 780
 781 #ifdef CONFIG_CPU_FREQ
 782 /*
 783  * Here we define a transistion notifier so that we can update all of our
 784  * ports' baud rate when the peripheral clock changes.
 785  */
 786 static int sci_notifier(struct notifier_block *self,
 787                         unsigned long phase, void *p)
 788 {
 789         struct cpufreq_freqs *freqs = p;
 790         int i;
 791
 792         if ((phase == CPUFREQ_POSTCHANGE) ||
 793             (phase == CPUFREQ_RESUMECHANGE)){
 794                 for (i = 0; i < SCI_NPORTS; i++) {
 795                         struct uart_port *port = &sci_ports[i].port;
 796                         struct clk *clk;
 797
 798                         /*
 799                          * Update the uartclk per-port if frequency has
 800                          * changed, since it will no longer necessarily be
 801                          * consistent with the old frequency.
 802                          *
 803                          * Really we want to be able to do something like
 804                          * uart_change_speed() or something along those lines
 805                          * here to implicitly reset the per-port baud rate..
 806                          *
 807                          * Clean this up later..
 808                          */
 809                         clk = clk_get(NULL, "module_clk");
 810                         port->uartclk = clk_get_rate(clk) * 16;
 811                         clk_put(clk);
 812                 }
 813
 814                 printk(KERN_INFO "%s: got a postchange notification "
 815                        "for cpu %d (old %d, new %d)\n",
 816                        __FUNCTION__, freqs->cpu, freqs->old, freqs->new);
 817         }
 818
 819         return NOTIFY_OK;
 820 }
 821
 822 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
 823 #endif /* CONFIG_CPU_FREQ */
 824
 825 static int sci_request_irq(struct sci_port *port)
 826 {
 827         int i;
 828         irqreturn_t (*handlers[4])(int irq, void *ptr) = {
 829                 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
 830                 sci_br_interrupt,
 831         };
 832         const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
 833                                "SCI Transmit Data Empty", "SCI Break" };
 834
 835         if (port->irqs[0] == port->irqs[1]) {
 836                 if (!port->irqs[0]) {
 837                         printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
 838                         return -ENODEV;
 839                 }
 840
 841                 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
 842                                 IRQF_DISABLED, "sci", port)) {
 843                         printk(KERN_ERR "sci: Cannot allocate irq.\n");
 844                         return -ENODEV;
 845                 }
 846         } else {
 847                 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
 848                         if (!port->irqs[i])
 849                                 continue;
 850                         if (request_irq(port->irqs[i], handlers[i],
 851                                         IRQF_DISABLED, desc[i], port)) {
 852                                 printk(KERN_ERR "sci: Cannot allocate irq.\n");
 853                                 return -ENODEV;
 854                         }
 855                 }
 856         }
 857
 858         return 0;
 859 }
 860
 861 static void sci_free_irq(struct sci_port *port)
 862 {
 863         int i;
 864
 865         if (port->irqs[0] == port->irqs[1]) {
 866                 if (!port->irqs[0])
 867                         printk("sci: sci_free_irq error\n");
 868                 else
 869                         free_irq(port->irqs[0], port);
 870         } else {
 871                 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
 872                         if (!port->irqs[i])
 873                                 continue;
 874
 875                         free_irq(port->irqs[i], port);
 876                 }
 877         }
 878 }
 879
 880 static unsigned int sci_tx_empty(struct uart_port *port)
 881 {
 882         /* Can't detect */
 883         return TIOCSER_TEMT;
 884 }
 885
 886 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
 887 {
 888         /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
 889         /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
 890         /* If you have signals for DTR and DCD, please implement here. */
 891 }
 892
 893 static unsigned int sci_get_mctrl(struct uart_port *port)
 894 {
 895         /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
 896            and CTS/RTS */
 897
 898         return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
 899 }
 900
 901 static void sci_start_tx(struct uart_port *port)
 902 {
 903         unsigned short ctrl;
 904
 905         /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
 906         ctrl = sci_in(port, SCSCR);
 907         ctrl |= SCI_CTRL_FLAGS_TIE;
 908         sci_out(port, SCSCR, ctrl);
 909 }
 910
 911 static void sci_stop_tx(struct uart_port *port)
 912 {
 913         unsigned short ctrl;
 914
 915         /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
 916         ctrl = sci_in(port, SCSCR);
 917         ctrl &= ~SCI_CTRL_FLAGS_TIE;
 918         sci_out(port, SCSCR, ctrl);
 919 }
 920
 921 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
 922 {
 923         unsigned short ctrl;
 924
 925         /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
 926         ctrl = sci_in(port, SCSCR);
 927         ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
 928         sci_out(port, SCSCR, ctrl);
 929 }
 930
 931 static void sci_stop_rx(struct uart_port *port)
 932 {
 933         unsigned short ctrl;
 934
 935         /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
 936         ctrl = sci_in(port, SCSCR);
 937         ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
 938         sci_out(port, SCSCR, ctrl);
 939 }
 940
 941 static void sci_enable_ms(struct uart_port *port)
 942 {
 943         /* Nothing here yet .. */
 944 }
 945
 946 static void sci_break_ctl(struct uart_port *port, int break_state)
 947 {
 948         /* Nothing here yet .. */
 949 }
 950
 951 static int sci_startup(struct uart_port *port)
 952 {
 953         struct sci_port *s = &sci_ports[port->line];
 954
 955         if (s->enable)
 956                 s->enable(port);
 957
 958         sci_request_irq(s);
 959         sci_start_tx(port);
 960         sci_start_rx(port, 1);
 961
 962         return 0;
 963 }
 964
 965 static void sci_shutdown(struct uart_port *port)
 966 {
 967         struct sci_port *s = &sci_ports[port->line];
 968
 969         sci_stop_rx(port);
 970         sci_stop_tx(port);
 971         sci_free_irq(s);
 972
 973         if (s->disable)
 974                 s->disable(port);
 975 }
 976
 977 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 978                             struct ktermios *old)
 979 {
 980         struct sci_port *s = &sci_ports[port->line];
 981         unsigned int status, baud, smr_val;
 982         int t;
 983
 984         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
 985
 986         switch (baud) {
 987                 case 0:
 988                         t = -1;
 989                         break;
 990                 default:
 991                 {
 992 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
 993                         struct clk *clk = clk_get(NULL, "module_clk");
 994                         t = SCBRR_VALUE(baud, clk_get_rate(clk));
 995                         clk_put(clk);
 996 #else
 997                         t = SCBRR_VALUE(baud);
 998 #endif
 999                         break;
1000                 }
1001         }
1002
1003         do {
1004                 status = sci_in(port, SCxSR);
1005         } while (!(status & SCxSR_TEND(port)));
1006
1007         sci_out(port, SCSCR, 0x00);     /* TE=0, RE=0, CKE1=0 */
1008
1009 #if !defined(SCI_ONLY)
1010         if (port->type == PORT_SCIF)
1011                 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1012 #endif
1013
1014         smr_val = sci_in(port, SCSMR) & 3;
1015         if ((termios->c_cflag & CSIZE) == CS7)
1016                 smr_val |= 0x40;
1017         if (termios->c_cflag & PARENB)
1018                 smr_val |= 0x20;
1019         if (termios->c_cflag & PARODD)
1020                 smr_val |= 0x30;
1021         if (termios->c_cflag & CSTOPB)
1022                 smr_val |= 0x08;
1023
1024         uart_update_timeout(port, termios->c_cflag, baud);
1025
1026         sci_out(port, SCSMR, smr_val);
1027
1028         if (t > 0) {
1029                 if(t >= 256) {
1030                         sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1031                         t >>= 2;
1032                 } else {
1033                         sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1034                 }
1035                 sci_out(port, SCBRR, t);
1036                 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1037         }
1038
1039         if (likely(s->init_pins))
1040                 s->init_pins(port, termios->c_cflag);
1041
1042         sci_out(port, SCSCR, SCSCR_INIT(port));
1043
1044         if ((termios->c_cflag & CREAD) != 0)
1045               sci_start_rx(port,0);
1046 }
1047
1048 static const char *sci_type(struct uart_port *port)
1049 {
1050         switch (port->type) {
1051                 case PORT_SCI:  return "sci";
1052                 case PORT_SCIF: return "scif";
1053                 case PORT_IRDA: return "irda";
1054         }
1055
1056         return 0;
1057 }
1058
1059 static void sci_release_port(struct uart_port *port)
1060 {
1061         /* Nothing here yet .. */
1062 }
1063
1064 static int sci_request_port(struct uart_port *port)
1065 {
1066         /* Nothing here yet .. */
1067         return 0;
1068 }
1069
1070 static void sci_config_port(struct uart_port *port, int flags)
1071 {
1072         struct sci_port *s = &sci_ports[port->line];
1073
1074         port->type = s->type;
1075
1076         switch (port->type) {
1077         case PORT_SCI:
1078                 s->init_pins = sci_init_pins_sci;
1079                 break;
1080         case PORT_SCIF:
1081                 s->init_pins = sci_init_pins_scif;
1082                 break;
1083         case PORT_IRDA:
1084                 s->init_pins = sci_init_pins_irda;
1085                 break;
1086         }
1087
1088 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1089         if (port->mapbase == 0)
1090                 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1091
1092         port->membase = (void __iomem *)port->mapbase;
1093 #endif
1094 }
1095
1096 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1097 {
1098         struct sci_port *s = &sci_ports[port->line];
1099
1100         if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1101                 return -EINVAL;
1102         if (ser->baud_base < 2400)
1103                 /* No paper tape reader for Mitch.. */
1104                 return -EINVAL;
1105
1106         return 0;
1107 }
1108
1109 static struct uart_ops sci_uart_ops = {
1110         .tx_empty       = sci_tx_empty,
1111         .set_mctrl      = sci_set_mctrl,
1112         .get_mctrl      = sci_get_mctrl,
1113         .start_tx       = sci_start_tx,
1114         .stop_tx        = sci_stop_tx,
1115         .stop_rx        = sci_stop_rx,
1116         .enable_ms      = sci_enable_ms,
1117         .break_ctl      = sci_break_ctl,
1118         .startup        = sci_startup,
1119         .shutdown       = sci_shutdown,
1120         .set_termios    = sci_set_termios,
1121         .type           = sci_type,
1122         .release_port   = sci_release_port,
1123         .request_port   = sci_request_port,
1124         .config_port    = sci_config_port,
1125         .verify_port    = sci_verify_port,
1126 };
1127
1128 static void __init sci_init_ports(void)
1129 {
1130         static int first = 1;
1131         int i;
1132
1133         if (!first)
1134                 return;
1135
1136         first = 0;
1137
1138         for (i = 0; i < SCI_NPORTS; i++) {
1139                 sci_ports[i].port.ops           = &sci_uart_ops;
1140                 sci_ports[i].port.iotype        = UPIO_MEM;
1141                 sci_ports[i].port.line          = i;
1142                 sci_ports[i].port.fifosize      = 1;
1143
1144 #if defined(__H8300H__) || defined(__H8300S__)
1145 #ifdef __H8300S__
1146                 sci_ports[i].enable     = h8300_sci_enable;
1147                 sci_ports[i].disable    = h8300_sci_disable;
1148 #endif
1149                 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1150 #elif defined(CONFIG_SUPERH64)
1151                 sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16;
1152 #else
1153                 /*
1154                  * XXX: We should use a proper SCI/SCIF clock
1155                  */
1156                 {
1157                         struct clk *clk = clk_get(NULL, "module_clk");
1158                         sci_ports[i].port.uartclk = clk_get_rate(clk) * 16;
1159                         clk_put(clk);
1160                 }
1161 #endif
1162
1163                 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1164                 sci_ports[i].break_timer.function = sci_break_timer;
1165
1166                 init_timer(&sci_ports[i].break_timer);
1167         }
1168 }
1169
1170 int __init early_sci_setup(struct uart_port *port)
1171 {
1172         if (unlikely(port->line > SCI_NPORTS))
1173                 return -ENODEV;
1174
1175         sci_init_ports();
1176
1177         sci_ports[port->line].port.membase      = port->membase;
1178         sci_ports[port->line].port.mapbase      = port->mapbase;
1179         sci_ports[port->line].port.type         = port->type;
1180
1181         return 0;
1182 }
1183
1184 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1185 /*
1186  *      Print a string to the serial port trying not to disturb
1187  *      any possible real use of the port...
1188  */
1189 static void serial_console_write(struct console *co, const char *s,
1190                                  unsigned count)
1191 {
1192         put_string(serial_console_port, s, count);
1193 }
1194
1195 static int __init serial_console_setup(struct console *co, char *options)
1196 {
1197         struct uart_port *port;
1198         int baud = 115200;
1199         int bits = 8;
1200         int parity = 'n';
1201         int flow = 'n';
1202         int ret;
1203
1204         /*
1205          * Check whether an invalid uart number has been specified, and
1206          * if so, search for the first available port that does have
1207          * console support.
1208          */
1209         if (co->index >= SCI_NPORTS)
1210                 co->index = 0;
1211
1212         serial_console_port = &sci_ports[co->index];
1213         port = &serial_console_port->port;
1214
1215         /*
1216          * Also need to check port->type, we don't actually have any
1217          * UPIO_PORT ports, but uart_report_port() handily misreports
1218          * it anyways if we don't have a port available by the time this is
1219          * called.
1220          */
1221         if (!port->type)
1222                 return -ENODEV;
1223         if (!port->membase || !port->mapbase)
1224                 return -ENODEV;
1225
1226         port->type = serial_console_port->type;
1227
1228         if (port->flags & UPF_IOREMAP)
1229                 sci_config_port(port, 0);
1230
1231         if (serial_console_port->enable)
1232                 serial_console_port->enable(port);
1233
1234         if (options)
1235                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1236
1237         ret = uart_set_options(port, co, baud, parity, bits, flow);
1238 #if defined(__H8300H__) || defined(__H8300S__)
1239         /* disable rx interrupt */
1240         if (ret == 0)
1241                 sci_stop_rx(port);
1242 #endif
1243         return ret;
1244 }
1245
1246 static struct console serial_console = {
1247         .name           = "ttySC",
1248         .device         = uart_console_device,
1249         .write          = serial_console_write,
1250         .setup          = serial_console_setup,
1251         .flags          = CON_PRINTBUFFER,
1252         .index          = -1,
1253         .data           = &sci_uart_driver,
1254 };
1255
1256 static int __init sci_console_init(void)
1257 {
1258         sci_init_ports();
1259         register_console(&serial_console);
1260         return 0;
1261 }
1262 console_initcall(sci_console_init);
1263 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1264
1265 #ifdef CONFIG_SH_KGDB
1266 /*
1267  * FIXME: Most of this can go away.. at the moment, we rely on
1268  * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1269  * most of that can easily be done here instead.
1270  *
1271  * For the time being, just accept the values that were parsed earlier..
1272  */
1273 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1274                                             int *parity, int *bits)
1275 {
1276         *baud = kgdb_baud;
1277         *parity = tolower(kgdb_parity);
1278         *bits = kgdb_bits - '0';
1279 }
1280
1281 /*
1282  * The naming here is somewhat misleading, since kgdb_console_setup() takes
1283  * care of the early-on initialization for kgdb, regardless of whether we
1284  * actually use kgdb as a console or not.
1285  *
1286  * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1287  */
1288 int __init kgdb_console_setup(struct console *co, char *options)
1289 {
1290         struct uart_port *port = &sci_ports[kgdb_portnum].port;
1291         int baud = 38400;
1292         int bits = 8;
1293         int parity = 'n';
1294         int flow = 'n';
1295
1296         if (co->index != kgdb_portnum)
1297                 co->index = kgdb_portnum;
1298
1299         kgdb_sci_port = &sci_ports[co->index];
1300         port = &kgdb_sci_port->port;
1301
1302         /*
1303          * Also need to check port->type, we don't actually have any
1304          * UPIO_PORT ports, but uart_report_port() handily misreports
1305          * it anyways if we don't have a port available by the time this is
1306          * called.
1307          */
1308         if (!port->type)
1309                 return -ENODEV;
1310         if (!port->membase || !port->mapbase)
1311                 return -ENODEV;
1312
1313         if (options)
1314                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1315         else
1316                 kgdb_console_get_options(port, &baud, &parity, &bits);
1317
1318         kgdb_getchar = kgdb_sci_getchar;
1319         kgdb_putchar = kgdb_sci_putchar;
1320
1321         return uart_set_options(port, co, baud, parity, bits, flow);
1322 }
1323 #endif /* CONFIG_SH_KGDB */
1324
1325 #ifdef CONFIG_SH_KGDB_CONSOLE
1326 static struct console kgdb_console = {
1327         .name           = "ttySC",
1328         .device         = uart_console_device,
1329         .write          = kgdb_console_write,
1330         .setup          = kgdb_console_setup,
1331         .flags          = CON_PRINTBUFFER,
1332         .index          = -1,
1333         .data           = &sci_uart_driver,
1334 };
1335
1336 /* Register the KGDB console so we get messages (d'oh!) */
1337 static int __init kgdb_console_init(void)
1338 {
1339         sci_init_ports();
1340         register_console(&kgdb_console);
1341         return 0;
1342 }
1343 console_initcall(kgdb_console_init);
1344 #endif /* CONFIG_SH_KGDB_CONSOLE */
1345
1346 #if defined(CONFIG_SH_KGDB_CONSOLE)
1347 #define SCI_CONSOLE     &kgdb_console
1348 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1349 #define SCI_CONSOLE     &serial_console
1350 #else
1351 #define SCI_CONSOLE     0
1352 #endif
1353
1354 static char banner[] __initdata =
1355         KERN_INFO "SuperH SCI(F) driver initialized\n";
1356
1357 static struct uart_driver sci_uart_driver = {
1358         .owner          = THIS_MODULE,
1359         .driver_name    = "sci",
1360         .dev_name       = "ttySC",
1361         .major          = SCI_MAJOR,
1362         .minor          = SCI_MINOR_START,
1363         .nr             = SCI_NPORTS,
1364         .cons           = SCI_CONSOLE,
1365 };
1366
1367 /*
1368  * Register a set of serial devices attached to a platform device.  The
1369  * list is terminated with a zero flags entry, which means we expect
1370  * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1371  * remapping (such as sh64) should also set UPF_IOREMAP.
1372  */
1373 static int __devinit sci_probe(struct platform_device *dev)
1374 {
1375         struct plat_sci_port *p = dev->dev.platform_data;
1376         int i;
1377
1378         for (i = 0; p && p->flags != 0; p++, i++) {
1379                 struct sci_port *sciport = &sci_ports[i];
1380
1381                 /* Sanity check */
1382                 if (unlikely(i == SCI_NPORTS)) {
1383                         dev_notice(&dev->dev, "Attempting to register port "
1384                                    "%d when only %d are available.\n",
1385                                    i+1, SCI_NPORTS);
1386                         dev_notice(&dev->dev, "Consider bumping "
1387                                    "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1388                         break;
1389                 }
1390
1391                 sciport->port.mapbase   = p->mapbase;
1392
1393                 /*
1394                  * For the simple (and majority of) cases where we don't need
1395                  * to do any remapping, just cast the cookie directly.
1396                  */
1397                 if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP))
1398                         p->membase = (void __iomem *)p->mapbase;
1399
1400                 sciport->port.membase   = p->membase;
1401
1402                 sciport->port.irq       = p->irqs[SCIx_TXI_IRQ];
1403                 sciport->port.flags     = p->flags;
1404                 sciport->port.dev       = &dev->dev;
1405
1406                 sciport->type           = sciport->port.type = p->type;
1407
1408                 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1409
1410                 uart_add_one_port(&sci_uart_driver, &sciport->port);
1411         }
1412
1413 #if defined(CONFIG_SH_KGDB) && !defined(CONFIG_SH_KGDB_CONSOLE)
1414         kgdb_sci_port   = &sci_ports[kgdb_portnum];
1415         kgdb_getchar    = kgdb_sci_getchar;
1416         kgdb_putchar    = kgdb_sci_putchar;
1417 #endif
1418
1419 #ifdef CONFIG_CPU_FREQ
1420         cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1421         dev_info(&dev->dev, "sci: CPU frequency notifier registered\n");
1422 #endif
1423
1424 #ifdef CONFIG_SH_STANDARD_BIOS
1425         sh_bios_gdb_detach();
1426 #endif
1427
1428         return 0;
1429 }
1430
1431 static int __devexit sci_remove(struct platform_device *dev)
1432 {
1433         int i;
1434
1435         for (i = 0; i < SCI_NPORTS; i++)
1436                 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1437
1438         return 0;
1439 }
1440
1441 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1442 {
1443         int i;
1444
1445         for (i = 0; i < SCI_NPORTS; i++) {
1446                 struct sci_port *p = &sci_ports[i];
1447
1448                 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1449                         uart_suspend_port(&sci_uart_driver, &p->port);
1450         }
1451
1452         return 0;
1453 }
1454
1455 static int sci_resume(struct platform_device *dev)
1456 {
1457         int i;
1458
1459         for (i = 0; i < SCI_NPORTS; i++) {
1460                 struct sci_port *p = &sci_ports[i];
1461
1462                 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1463                         uart_resume_port(&sci_uart_driver, &p->port);
1464         }
1465
1466         return 0;
1467 }
1468
1469 static struct platform_driver sci_driver = {
1470         .probe          = sci_probe,
1471         .remove         = __devexit_p(sci_remove),
1472         .suspend        = sci_suspend,
1473         .resume         = sci_resume,
1474         .driver         = {
1475                 .name   = "sh-sci",
1476                 .owner  = THIS_MODULE,
1477         },
1478 };
1479
1480 static int __init sci_init(void)
1481 {
1482         int ret;
1483
1484         printk(banner);
1485
1486         sci_init_ports();
1487
1488         ret = uart_register_driver(&sci_uart_driver);
1489         if (likely(ret == 0)) {
1490                 ret = platform_driver_register(&sci_driver);
1491                 if (unlikely(ret))
1492                         uart_unregister_driver(&sci_uart_driver);
1493         }
1494
1495         return ret;
1496 }
1497
1498 static void __exit sci_exit(void)
1499 {
1500         platform_driver_unregister(&sci_driver);
1501         uart_unregister_driver(&sci_uart_driver);
1502 }
1503
1504 module_init(sci_init);
1505 module_exit(sci_exit);
1506
1507 MODULE_LICENSE("GPL");