drivers/serial/cpm_uart/cpm_uart_core.c

   1 /*
   2  *  linux/drivers/serial/cpm_uart.c
   3  *
   4  *  Driver for CPM (SCC/SMC) serial ports; core driver
   5  *
   6  *  Based on arch/ppc/cpm2_io/uart.c by Dan Malek
   7  *  Based on ppc8xx.c by Thomas Gleixner
   8  *  Based on drivers/serial/amba.c by Russell King
   9  *
  10  *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
  11  *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
  12  *
  13  *  Copyright (C) 2004 Freescale Semiconductor, Inc.
  14  *            (C) 2004 Intracom, S.A.
  15  *            (C) 2005-2006 MontaVista Software, Inc.
  16  *              Vitaly Bordug <vbordug@ru.mvista.com>
  17  *
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation; either version 2 of the License, or
  21  * (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  31  *
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/tty.h>
  36 #include <linux/ioport.h>
  37 #include <linux/init.h>
  38 #include <linux/serial.h>
  39 #include <linux/console.h>
  40 #include <linux/sysrq.h>
  41 #include <linux/device.h>
  42 #include <linux/bootmem.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/fs_uart_pd.h>
  45
  46 #include <asm/io.h>
  47 #include <asm/irq.h>
  48 #include <asm/delay.h>
  49
  50 #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  51 #define SUPPORT_SYSRQ
  52 #endif
  53
  54 #include <linux/serial_core.h>
  55 #include <linux/kernel.h>
  56
  57 #include "cpm_uart.h"
  58
  59 /***********************************************************************/
  60
  61 /* Track which ports are configured as uarts */
  62 int cpm_uart_port_map[UART_NR];
  63 /* How many ports did we config as uarts */
  64 int cpm_uart_nr = 0;
  65
  66 /**************************************************************/
  67
  68 static int  cpm_uart_tx_pump(struct uart_port *port);
  69 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo);
  70 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo);
  71 static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
  72
  73 /**************************************************************/
  74
  75
  76 /* Place-holder for board-specific stuff */
  77 struct platform_device* __attribute__ ((weak)) __init
  78 early_uart_get_pdev(int index)
  79 {
  80         return NULL;
  81 }
  82
  83
  84 static void cpm_uart_count(void)
  85 {
  86         cpm_uart_nr = 0;
  87 #ifdef CONFIG_SERIAL_CPM_SMC1
  88         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
  89 #endif
  90 #ifdef CONFIG_SERIAL_CPM_SMC2
  91         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
  92 #endif
  93 #ifdef CONFIG_SERIAL_CPM_SCC1
  94         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
  95 #endif
  96 #ifdef CONFIG_SERIAL_CPM_SCC2
  97         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
  98 #endif
  99 #ifdef CONFIG_SERIAL_CPM_SCC3
 100         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
 101 #endif
 102 #ifdef CONFIG_SERIAL_CPM_SCC4
 103         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
 104 #endif
 105 }
 106
 107 /* Get UART number by its id */
 108 static int cpm_uart_id2nr(int id)
 109 {
 110         int i;
 111         if (id < UART_NR) {
 112                 for (i=0; i<UART_NR; i++) {
 113                         if (cpm_uart_port_map[i] == id)
 114                                 return i;
 115                 }
 116         }
 117
 118         /* not found or invalid argument */
 119         return -1;
 120 }
 121
 122 /*
 123  * Check, if transmit buffers are processed
 124 */
 125 static unsigned int cpm_uart_tx_empty(struct uart_port *port)
 126 {
 127         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 128         volatile cbd_t *bdp = pinfo->tx_bd_base;
 129         int ret = 0;
 130
 131         while (1) {
 132                 if (bdp->cbd_sc & BD_SC_READY)
 133                         break;
 134
 135                 if (bdp->cbd_sc & BD_SC_WRAP) {
 136                         ret = TIOCSER_TEMT;
 137                         break;
 138                 }
 139                 bdp++;
 140         }
 141
 142         pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
 143
 144         return ret;
 145 }
 146
 147 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 148 {
 149         /* Whee. Do nothing. */
 150 }
 151
 152 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
 153 {
 154         /* Whee. Do nothing. */
 155         return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 156 }
 157
 158 /*
 159  * Stop transmitter
 160  */
 161 static void cpm_uart_stop_tx(struct uart_port *port)
 162 {
 163         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 164         volatile smc_t *smcp = pinfo->smcp;
 165         volatile scc_t *sccp = pinfo->sccp;
 166
 167         pr_debug("CPM uart[%d]:stop tx\n", port->line);
 168
 169         if (IS_SMC(pinfo))
 170                 smcp->smc_smcm &= ~SMCM_TX;
 171         else
 172                 sccp->scc_sccm &= ~UART_SCCM_TX;
 173 }
 174
 175 /*
 176  * Start transmitter
 177  */
 178 static void cpm_uart_start_tx(struct uart_port *port)
 179 {
 180         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 181         volatile smc_t *smcp = pinfo->smcp;
 182         volatile scc_t *sccp = pinfo->sccp;
 183
 184         pr_debug("CPM uart[%d]:start tx\n", port->line);
 185
 186         if (IS_SMC(pinfo)) {
 187                 if (smcp->smc_smcm & SMCM_TX)
 188                         return;
 189         } else {
 190                 if (sccp->scc_sccm & UART_SCCM_TX)
 191                         return;
 192         }
 193
 194         if (cpm_uart_tx_pump(port) != 0) {
 195                 if (IS_SMC(pinfo)) {
 196                         smcp->smc_smcm |= SMCM_TX;
 197                         smcp->smc_smcmr |= SMCMR_TEN;
 198                 } else {
 199                         sccp->scc_sccm |= UART_SCCM_TX;
 200                         pinfo->sccp->scc_gsmrl |= SCC_GSMRL_ENT;
 201                 }
 202         }
 203 }
 204
 205 /*
 206  * Stop receiver
 207  */
 208 static void cpm_uart_stop_rx(struct uart_port *port)
 209 {
 210         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 211         volatile smc_t *smcp = pinfo->smcp;
 212         volatile scc_t *sccp = pinfo->sccp;
 213
 214         pr_debug("CPM uart[%d]:stop rx\n", port->line);
 215
 216         if (IS_SMC(pinfo))
 217                 smcp->smc_smcm &= ~SMCM_RX;
 218         else
 219                 sccp->scc_sccm &= ~UART_SCCM_RX;
 220 }
 221
 222 /*
 223  * Enable Modem status interrupts
 224  */
 225 static void cpm_uart_enable_ms(struct uart_port *port)
 226 {
 227         pr_debug("CPM uart[%d]:enable ms\n", port->line);
 228 }
 229
 230 /*
 231  * Generate a break.
 232  */
 233 static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
 234 {
 235         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 236         int line = pinfo - cpm_uart_ports;
 237
 238         pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
 239                 break_state);
 240
 241         if (break_state)
 242                 cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
 243         else
 244                 cpm_line_cr_cmd(line, CPM_CR_RESTART_TX);
 245 }
 246
 247 /*
 248  * Transmit characters, refill buffer descriptor, if possible
 249  */
 250 static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs)
 251 {
 252         pr_debug("CPM uart[%d]:TX INT\n", port->line);
 253
 254         cpm_uart_tx_pump(port);
 255 }
 256
 257 /*
 258  * Receive characters
 259  */
 260 static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
 261 {
 262         int i;
 263         unsigned char ch, *cp;
 264         struct tty_struct *tty = port->info->tty;
 265         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 266         volatile cbd_t *bdp;
 267         u16 status;
 268         unsigned int flg;
 269
 270         pr_debug("CPM uart[%d]:RX INT\n", port->line);
 271
 272         /* Just loop through the closed BDs and copy the characters into
 273          * the buffer.
 274          */
 275         bdp = pinfo->rx_cur;
 276         for (;;) {
 277                 /* get status */
 278                 status = bdp->cbd_sc;
 279                 /* If this one is empty, return happy */
 280                 if (status & BD_SC_EMPTY)
 281                         break;
 282
 283                 /* get number of characters, and check spce in flip-buffer */
 284                 i = bdp->cbd_datlen;
 285
 286                 /* If we have not enough room in tty flip buffer, then we try
 287                  * later, which will be the next rx-interrupt or a timeout
 288                  */
 289                 if(tty_buffer_request_room(tty, i) < i) {
 290                         printk(KERN_WARNING "No room in flip buffer\n");
 291                         return;
 292                 }
 293
 294                 /* get pointer */
 295                 cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 296
 297                 /* loop through the buffer */
 298                 while (i-- > 0) {
 299                         ch = *cp++;
 300                         port->icount.rx++;
 301                         flg = TTY_NORMAL;
 302
 303                         if (status &
 304                             (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
 305                                 goto handle_error;
 306                         if (uart_handle_sysrq_char(port, ch, regs))
 307                                 continue;
 308
 309                       error_return:
 310                         tty_insert_flip_char(tty, ch, flg);
 311
 312                 }               /* End while (i--) */
 313
 314                 /* This BD is ready to be used again. Clear status. get next */
 315                 bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
 316                 bdp->cbd_sc |= BD_SC_EMPTY;
 317
 318                 if (bdp->cbd_sc & BD_SC_WRAP)
 319                         bdp = pinfo->rx_bd_base;
 320                 else
 321                         bdp++;
 322
 323         } /* End for (;;) */
 324
 325         /* Write back buffer pointer */
 326         pinfo->rx_cur = (volatile cbd_t *) bdp;
 327
 328         /* activate BH processing */
 329         tty_flip_buffer_push(tty);
 330
 331         return;
 332
 333         /* Error processing */
 334
 335       handle_error:
 336         /* Statistics */
 337         if (status & BD_SC_BR)
 338                 port->icount.brk++;
 339         if (status & BD_SC_PR)
 340                 port->icount.parity++;
 341         if (status & BD_SC_FR)
 342                 port->icount.frame++;
 343         if (status & BD_SC_OV)
 344                 port->icount.overrun++;
 345
 346         /* Mask out ignored conditions */
 347         status &= port->read_status_mask;
 348
 349         /* Handle the remaining ones */
 350         if (status & BD_SC_BR)
 351                 flg = TTY_BREAK;
 352         else if (status & BD_SC_PR)
 353                 flg = TTY_PARITY;
 354         else if (status & BD_SC_FR)
 355                 flg = TTY_FRAME;
 356
 357         /* overrun does not affect the current character ! */
 358         if (status & BD_SC_OV) {
 359                 ch = 0;
 360                 flg = TTY_OVERRUN;
 361                 /* We skip this buffer */
 362                 /* CHECK: Is really nothing senseful there */
 363                 /* ASSUMPTION: it contains nothing valid */
 364                 i = 0;
 365         }
 366 #ifdef SUPPORT_SYSRQ
 367         port->sysrq = 0;
 368 #endif
 369         goto error_return;
 370 }
 371
 372 /*
 373  * Asynchron mode interrupt handler
 374  */
 375 static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs)
 376 {
 377         u8 events;
 378         struct uart_port *port = (struct uart_port *)data;
 379         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 380         volatile smc_t *smcp = pinfo->smcp;
 381         volatile scc_t *sccp = pinfo->sccp;
 382
 383         pr_debug("CPM uart[%d]:IRQ\n", port->line);
 384
 385         if (IS_SMC(pinfo)) {
 386                 events = smcp->smc_smce;
 387                 smcp->smc_smce = events;
 388                 if (events & SMCM_BRKE)
 389                         uart_handle_break(port);
 390                 if (events & SMCM_RX)
 391                         cpm_uart_int_rx(port, regs);
 392                 if (events & SMCM_TX)
 393                         cpm_uart_int_tx(port, regs);
 394         } else {
 395                 events = sccp->scc_scce;
 396                 sccp->scc_scce = events;
 397                 if (events & UART_SCCM_BRKE)
 398                         uart_handle_break(port);
 399                 if (events & UART_SCCM_RX)
 400                         cpm_uart_int_rx(port, regs);
 401                 if (events & UART_SCCM_TX)
 402                         cpm_uart_int_tx(port, regs);
 403         }
 404         return (events) ? IRQ_HANDLED : IRQ_NONE;
 405 }
 406
 407 static int cpm_uart_startup(struct uart_port *port)
 408 {
 409         int retval;
 410         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 411         int line = pinfo - cpm_uart_ports;
 412
 413         pr_debug("CPM uart[%d]:startup\n", port->line);
 414
 415         /* Install interrupt handler. */
 416         retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
 417         if (retval)
 418                 return retval;
 419
 420         /* Startup rx-int */
 421         if (IS_SMC(pinfo)) {
 422                 pinfo->smcp->smc_smcm |= SMCM_RX;
 423                 pinfo->smcp->smc_smcmr |= SMCMR_REN;
 424         } else {
 425                 pinfo->sccp->scc_sccm |= UART_SCCM_RX;
 426         }
 427
 428         if (!(pinfo->flags & FLAG_CONSOLE))
 429                 cpm_line_cr_cmd(line,CPM_CR_INIT_TRX);
 430         return 0;
 431 }
 432
 433 inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
 434 {
 435         set_current_state(TASK_UNINTERRUPTIBLE);
 436         schedule_timeout(pinfo->wait_closing);
 437 }
 438
 439 /*
 440  * Shutdown the uart
 441  */
 442 static void cpm_uart_shutdown(struct uart_port *port)
 443 {
 444         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 445         int line = pinfo - cpm_uart_ports;
 446
 447         pr_debug("CPM uart[%d]:shutdown\n", port->line);
 448
 449         /* free interrupt handler */
 450         free_irq(port->irq, port);
 451
 452         /* If the port is not the console, disable Rx and Tx. */
 453         if (!(pinfo->flags & FLAG_CONSOLE)) {
 454                 /* Wait for all the BDs marked sent */
 455                 while(!cpm_uart_tx_empty(port)) {
 456                         set_current_state(TASK_UNINTERRUPTIBLE);
 457                         schedule_timeout(2);
 458                 }
 459
 460                 if (pinfo->wait_closing)
 461                         cpm_uart_wait_until_send(pinfo);
 462
 463                 /* Stop uarts */
 464                 if (IS_SMC(pinfo)) {
 465                         volatile smc_t *smcp = pinfo->smcp;
 466                         smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 467                         smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
 468                 } else {
 469                         volatile scc_t *sccp = pinfo->sccp;
 470                         sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 471                         sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
 472                 }
 473
 474                 /* Shut them really down and reinit buffer descriptors */
 475                 if (IS_SMC(pinfo))
 476                         cpm_line_cr_cmd(line, CPM_CR_STOP_TX);
 477                 else
 478                         cpm_line_cr_cmd(line, CPM_CR_GRA_STOP_TX);
 479
 480                 cpm_uart_initbd(pinfo);
 481         }
 482 }
 483
 484 static void cpm_uart_set_termios(struct uart_port *port,
 485                                  struct termios *termios, struct termios *old)
 486 {
 487         int baud;
 488         unsigned long flags;
 489         u16 cval, scval, prev_mode;
 490         int bits, sbits;
 491         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 492         volatile smc_t *smcp = pinfo->smcp;
 493         volatile scc_t *sccp = pinfo->sccp;
 494
 495         pr_debug("CPM uart[%d]:set_termios\n", port->line);
 496
 497         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
 498
 499         /* Character length programmed into the mode register is the
 500          * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
 501          * 1 or 2 stop bits, minus 1.
 502          * The value 'bits' counts this for us.
 503          */
 504         cval = 0;
 505         scval = 0;
 506
 507         /* byte size */
 508         switch (termios->c_cflag & CSIZE) {
 509         case CS5:
 510                 bits = 5;
 511                 break;
 512         case CS6:
 513                 bits = 6;
 514                 break;
 515         case CS7:
 516                 bits = 7;
 517                 break;
 518         case CS8:
 519                 bits = 8;
 520                 break;
 521                 /* Never happens, but GCC is too dumb to figure it out */
 522         default:
 523                 bits = 8;
 524                 break;
 525         }
 526         sbits = bits - 5;
 527
 528         if (termios->c_cflag & CSTOPB) {
 529                 cval |= SMCMR_SL;       /* Two stops */
 530                 scval |= SCU_PSMR_SL;
 531                 bits++;
 532         }
 533
 534         if (termios->c_cflag & PARENB) {
 535                 cval |= SMCMR_PEN;
 536                 scval |= SCU_PSMR_PEN;
 537                 bits++;
 538                 if (!(termios->c_cflag & PARODD)) {
 539                         cval |= SMCMR_PM_EVEN;
 540                         scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
 541                 }
 542         }
 543
 544         /*
 545          * Set up parity check flag
 546          */
 547 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 548
 549         port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
 550         if (termios->c_iflag & INPCK)
 551                 port->read_status_mask |= BD_SC_FR | BD_SC_PR;
 552         if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
 553                 port->read_status_mask |= BD_SC_BR;
 554
 555         /*
 556          * Characters to ignore
 557          */
 558         port->ignore_status_mask = 0;
 559         if (termios->c_iflag & IGNPAR)
 560                 port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
 561         if (termios->c_iflag & IGNBRK) {
 562                 port->ignore_status_mask |= BD_SC_BR;
 563                 /*
 564                  * If we're ignore parity and break indicators, ignore
 565                  * overruns too.  (For real raw support).
 566                  */
 567                 if (termios->c_iflag & IGNPAR)
 568                         port->ignore_status_mask |= BD_SC_OV;
 569         }
 570         /*
 571          * !!! ignore all characters if CREAD is not set
 572          */
 573         if ((termios->c_cflag & CREAD) == 0)
 574                 port->read_status_mask &= ~BD_SC_EMPTY;
 575
 576         spin_lock_irqsave(&port->lock, flags);
 577
 578         /* Start bit has not been added (so don't, because we would just
 579          * subtract it later), and we need to add one for the number of
 580          * stops bits (there is always at least one).
 581          */
 582         bits++;
 583         if (IS_SMC(pinfo)) {
 584                 /* Set the mode register.  We want to keep a copy of the
 585                  * enables, because we want to put them back if they were
 586                  * present.
 587                  */
 588                 prev_mode = smcp->smc_smcmr;
 589                 smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART;
 590                 smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
 591         } else {
 592                 sccp->scc_psmr = (sbits << 12) | scval;
 593         }
 594
 595         cpm_set_brg(pinfo->brg - 1, baud);
 596         spin_unlock_irqrestore(&port->lock, flags);
 597
 598 }
 599
 600 static const char *cpm_uart_type(struct uart_port *port)
 601 {
 602         pr_debug("CPM uart[%d]:uart_type\n", port->line);
 603
 604         return port->type == PORT_CPM ? "CPM UART" : NULL;
 605 }
 606
 607 /*
 608  * verify the new serial_struct (for TIOCSSERIAL).
 609  */
 610 static int cpm_uart_verify_port(struct uart_port *port,
 611                                 struct serial_struct *ser)
 612 {
 613         int ret = 0;
 614
 615         pr_debug("CPM uart[%d]:verify_port\n", port->line);
 616
 617         if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
 618                 ret = -EINVAL;
 619         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 620                 ret = -EINVAL;
 621         if (ser->baud_base < 9600)
 622                 ret = -EINVAL;
 623         return ret;
 624 }
 625
 626 /*
 627  * Transmit characters, refill buffer descriptor, if possible
 628  */
 629 static int cpm_uart_tx_pump(struct uart_port *port)
 630 {
 631         volatile cbd_t *bdp;
 632         unsigned char *p;
 633         int count;
 634         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 635         struct circ_buf *xmit = &port->info->xmit;
 636
 637         /* Handle xon/xoff */
 638         if (port->x_char) {
 639                 /* Pick next descriptor and fill from buffer */
 640                 bdp = pinfo->tx_cur;
 641
 642                 p = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 643
 644                 *p++ = port->x_char;
 645                 bdp->cbd_datlen = 1;
 646                 bdp->cbd_sc |= BD_SC_READY;
 647                 /* Get next BD. */
 648                 if (bdp->cbd_sc & BD_SC_WRAP)
 649                         bdp = pinfo->tx_bd_base;
 650                 else
 651                         bdp++;
 652                 pinfo->tx_cur = bdp;
 653
 654                 port->icount.tx++;
 655                 port->x_char = 0;
 656                 return 1;
 657         }
 658
 659         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 660                 cpm_uart_stop_tx(port);
 661                 return 0;
 662         }
 663
 664         /* Pick next descriptor and fill from buffer */
 665         bdp = pinfo->tx_cur;
 666
 667         while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) {
 668                 count = 0;
 669                 p = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 670                 while (count < pinfo->tx_fifosize) {
 671                         *p++ = xmit->buf[xmit->tail];
 672                         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 673                         port->icount.tx++;
 674                         count++;
 675                         if (xmit->head == xmit->tail)
 676                                 break;
 677                 }
 678                 bdp->cbd_datlen = count;
 679                 bdp->cbd_sc |= BD_SC_READY;
 680                 __asm__("eieio");
 681                 /* Get next BD. */
 682                 if (bdp->cbd_sc & BD_SC_WRAP)
 683                         bdp = pinfo->tx_bd_base;
 684                 else
 685                         bdp++;
 686         }
 687         pinfo->tx_cur = bdp;
 688
 689         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 690                 uart_write_wakeup(port);
 691
 692         if (uart_circ_empty(xmit)) {
 693                 cpm_uart_stop_tx(port);
 694                 return 0;
 695         }
 696
 697         return 1;
 698 }
 699
 700 /*
 701  * init buffer descriptors
 702  */
 703 static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
 704 {
 705         int i;
 706         u8 *mem_addr;
 707         volatile cbd_t *bdp;
 708
 709         pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
 710
 711         /* Set the physical address of the host memory
 712          * buffers in the buffer descriptors, and the
 713          * virtual address for us to work with.
 714          */
 715         mem_addr = pinfo->mem_addr;
 716         bdp = pinfo->rx_cur = pinfo->rx_bd_base;
 717         for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
 718                 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 719                 bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
 720                 mem_addr += pinfo->rx_fifosize;
 721         }
 722
 723         bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 724         bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
 725
 726         /* Set the physical address of the host memory
 727          * buffers in the buffer descriptors, and the
 728          * virtual address for us to work with.
 729          */
 730         mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
 731         bdp = pinfo->tx_cur = pinfo->tx_bd_base;
 732         for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
 733                 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 734                 bdp->cbd_sc = BD_SC_INTRPT;
 735                 mem_addr += pinfo->tx_fifosize;
 736         }
 737
 738         bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 739         bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT;
 740 }
 741
 742 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
 743 {
 744         int line = pinfo - cpm_uart_ports;
 745         volatile scc_t *scp;
 746         volatile scc_uart_t *sup;
 747
 748         pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
 749
 750         scp = pinfo->sccp;
 751         sup = pinfo->sccup;
 752
 753         /* Store address */
 754         pinfo->sccup->scc_genscc.scc_rbase = (unsigned char *)pinfo->rx_bd_base - DPRAM_BASE;
 755         pinfo->sccup->scc_genscc.scc_tbase = (unsigned char *)pinfo->tx_bd_base - DPRAM_BASE;
 756
 757         /* Set up the uart parameters in the
 758          * parameter ram.
 759          */
 760
 761         cpm_set_scc_fcr(sup);
 762
 763         sup->scc_genscc.scc_mrblr = pinfo->rx_fifosize;
 764         sup->scc_maxidl = pinfo->rx_fifosize;
 765         sup->scc_brkcr = 1;
 766         sup->scc_parec = 0;
 767         sup->scc_frmec = 0;
 768         sup->scc_nosec = 0;
 769         sup->scc_brkec = 0;
 770         sup->scc_uaddr1 = 0;
 771         sup->scc_uaddr2 = 0;
 772         sup->scc_toseq = 0;
 773         sup->scc_char1 = 0x8000;
 774         sup->scc_char2 = 0x8000;
 775         sup->scc_char3 = 0x8000;
 776         sup->scc_char4 = 0x8000;
 777         sup->scc_char5 = 0x8000;
 778         sup->scc_char6 = 0x8000;
 779         sup->scc_char7 = 0x8000;
 780         sup->scc_char8 = 0x8000;
 781         sup->scc_rccm = 0xc0ff;
 782
 783         /* Send the CPM an initialize command.
 784          */
 785         cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
 786
 787         /* Set UART mode, 8 bit, no parity, one stop.
 788          * Enable receive and transmit.
 789          */
 790         scp->scc_gsmrh = 0;
 791         scp->scc_gsmrl =
 792             (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
 793
 794         /* Enable rx interrupts  and clear all pending events.  */
 795         scp->scc_sccm = 0;
 796         scp->scc_scce = 0xffff;
 797         scp->scc_dsr = 0x7e7e;
 798         scp->scc_psmr = 0x3000;
 799
 800         scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 801 }
 802
 803 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
 804 {
 805         int line = pinfo - cpm_uart_ports;
 806         volatile smc_t *sp;
 807         volatile smc_uart_t *up;
 808
 809         pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
 810
 811         sp = pinfo->smcp;
 812         up = pinfo->smcup;
 813
 814         /* Store address */
 815         pinfo->smcup->smc_rbase = (u_char *)pinfo->rx_bd_base - DPRAM_BASE;
 816         pinfo->smcup->smc_tbase = (u_char *)pinfo->tx_bd_base - DPRAM_BASE;
 817
 818 /*
 819  *  In case SMC1 is being relocated...
 820  */
 821 #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH)
 822         up->smc_rbptr = pinfo->smcup->smc_rbase;
 823         up->smc_tbptr = pinfo->smcup->smc_tbase;
 824         up->smc_rstate = 0;
 825         up->smc_tstate = 0;
 826         up->smc_brkcr = 1;              /* number of break chars */
 827         up->smc_brkec = 0;
 828 #endif
 829
 830         /* Set up the uart parameters in the
 831          * parameter ram.
 832          */
 833         cpm_set_smc_fcr(up);
 834
 835         /* Using idle charater time requires some additional tuning.  */
 836         up->smc_mrblr = pinfo->rx_fifosize;
 837         up->smc_maxidl = pinfo->rx_fifosize;
 838         up->smc_brklen = 0;
 839         up->smc_brkec = 0;
 840         up->smc_brkcr = 1;
 841
 842         cpm_line_cr_cmd(line, CPM_CR_INIT_TRX);
 843
 844         /* Set UART mode, 8 bit, no parity, one stop.
 845          * Enable receive and transmit.
 846          */
 847         sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
 848
 849         /* Enable only rx interrupts clear all pending events. */
 850         sp->smc_smcm = 0;
 851         sp->smc_smce = 0xff;
 852
 853         sp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);
 854 }
 855
 856 /*
 857  * Initialize port. This is called from early_console stuff
 858  * so we have to be careful here !
 859  */
 860 static int cpm_uart_request_port(struct uart_port *port)
 861 {
 862         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 863         int ret;
 864
 865         pr_debug("CPM uart[%d]:request port\n", port->line);
 866
 867         if (pinfo->flags & FLAG_CONSOLE)
 868                 return 0;
 869
 870         if (IS_SMC(pinfo)) {
 871                 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
 872                 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 873         } else {
 874                 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
 875                 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 876         }
 877
 878         ret = cpm_uart_allocbuf(pinfo, 0);
 879
 880         if (ret)
 881                 return ret;
 882
 883         cpm_uart_initbd(pinfo);
 884         if (IS_SMC(pinfo))
 885                 cpm_uart_init_smc(pinfo);
 886         else
 887                 cpm_uart_init_scc(pinfo);
 888
 889         return 0;
 890 }
 891
 892 static void cpm_uart_release_port(struct uart_port *port)
 893 {
 894         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 895
 896         if (!(pinfo->flags & FLAG_CONSOLE))
 897                 cpm_uart_freebuf(pinfo);
 898 }
 899
 900 /*
 901  * Configure/autoconfigure the port.
 902  */
 903 static void cpm_uart_config_port(struct uart_port *port, int flags)
 904 {
 905         pr_debug("CPM uart[%d]:config_port\n", port->line);
 906
 907         if (flags & UART_CONFIG_TYPE) {
 908                 port->type = PORT_CPM;
 909                 cpm_uart_request_port(port);
 910         }
 911 }
 912 static struct uart_ops cpm_uart_pops = {
 913         .tx_empty       = cpm_uart_tx_empty,
 914         .set_mctrl      = cpm_uart_set_mctrl,
 915         .get_mctrl      = cpm_uart_get_mctrl,
 916         .stop_tx        = cpm_uart_stop_tx,
 917         .start_tx       = cpm_uart_start_tx,
 918         .stop_rx        = cpm_uart_stop_rx,
 919         .enable_ms      = cpm_uart_enable_ms,
 920         .break_ctl      = cpm_uart_break_ctl,
 921         .startup        = cpm_uart_startup,
 922         .shutdown       = cpm_uart_shutdown,
 923         .set_termios    = cpm_uart_set_termios,
 924         .type           = cpm_uart_type,
 925         .release_port   = cpm_uart_release_port,
 926         .request_port   = cpm_uart_request_port,
 927         .config_port    = cpm_uart_config_port,
 928         .verify_port    = cpm_uart_verify_port,
 929 };
 930
 931 struct uart_cpm_port cpm_uart_ports[UART_NR] = {
 932         [UART_SMC1] = {
 933                 .port = {
 934                         .irq            = SMC1_IRQ,
 935                         .ops            = &cpm_uart_pops,
 936                         .iotype         = UPIO_MEM,
 937                         .lock           = SPIN_LOCK_UNLOCKED,
 938                 },
 939                 .flags = FLAG_SMC,
 940                 .tx_nrfifos = TX_NUM_FIFO,
 941                 .tx_fifosize = TX_BUF_SIZE,
 942                 .rx_nrfifos = RX_NUM_FIFO,
 943                 .rx_fifosize = RX_BUF_SIZE,
 944                 .set_lineif = smc1_lineif,
 945         },
 946         [UART_SMC2] = {
 947                 .port = {
 948                         .irq            = SMC2_IRQ,
 949                         .ops            = &cpm_uart_pops,
 950                         .iotype         = UPIO_MEM,
 951                         .lock           = SPIN_LOCK_UNLOCKED,
 952                 },
 953                 .flags = FLAG_SMC,
 954                 .tx_nrfifos = TX_NUM_FIFO,
 955                 .tx_fifosize = TX_BUF_SIZE,
 956                 .rx_nrfifos = RX_NUM_FIFO,
 957                 .rx_fifosize = RX_BUF_SIZE,
 958                 .set_lineif = smc2_lineif,
 959 #ifdef CONFIG_SERIAL_CPM_ALT_SMC2
 960                 .is_portb = 1,
 961 #endif
 962         },
 963         [UART_SCC1] = {
 964                 .port = {
 965                         .irq            = SCC1_IRQ,
 966                         .ops            = &cpm_uart_pops,
 967                         .iotype         = UPIO_MEM,
 968                         .lock           = SPIN_LOCK_UNLOCKED,
 969                 },
 970                 .tx_nrfifos = TX_NUM_FIFO,
 971                 .tx_fifosize = TX_BUF_SIZE,
 972                 .rx_nrfifos = RX_NUM_FIFO,
 973                 .rx_fifosize = RX_BUF_SIZE,
 974                 .set_lineif = scc1_lineif,
 975                 .wait_closing = SCC_WAIT_CLOSING,
 976         },
 977         [UART_SCC2] = {
 978                 .port = {
 979                         .irq            = SCC2_IRQ,
 980                         .ops            = &cpm_uart_pops,
 981                         .iotype         = UPIO_MEM,
 982                         .lock           = SPIN_LOCK_UNLOCKED,
 983                 },
 984                 .tx_nrfifos = TX_NUM_FIFO,
 985                 .tx_fifosize = TX_BUF_SIZE,
 986                 .rx_nrfifos = RX_NUM_FIFO,
 987                 .rx_fifosize = RX_BUF_SIZE,
 988                 .set_lineif = scc2_lineif,
 989                 .wait_closing = SCC_WAIT_CLOSING,
 990         },
 991         [UART_SCC3] = {
 992                 .port = {
 993                         .irq            = SCC3_IRQ,
 994                         .ops            = &cpm_uart_pops,
 995                         .iotype         = UPIO_MEM,
 996                         .lock           = SPIN_LOCK_UNLOCKED,
 997                 },
 998                 .tx_nrfifos = TX_NUM_FIFO,
 999                 .tx_fifosize = TX_BUF_SIZE,
1000                 .rx_nrfifos = RX_NUM_FIFO,
1001                 .rx_fifosize = RX_BUF_SIZE,
1002                 .set_lineif = scc3_lineif,
1003                 .wait_closing = SCC_WAIT_CLOSING,
1004         },
1005         [UART_SCC4] = {
1006                 .port = {
1007                         .irq            = SCC4_IRQ,
1008                         .ops            = &cpm_uart_pops,
1009                         .iotype         = UPIO_MEM,
1010                         .lock           = SPIN_LOCK_UNLOCKED,
1011                 },
1012                 .tx_nrfifos = TX_NUM_FIFO,
1013                 .tx_fifosize = TX_BUF_SIZE,
1014                 .rx_nrfifos = RX_NUM_FIFO,
1015                 .rx_fifosize = RX_BUF_SIZE,
1016                 .set_lineif = scc4_lineif,
1017                 .wait_closing = SCC_WAIT_CLOSING,
1018         },
1019 };
1020
1021 int cpm_uart_drv_get_platform_data(struct platform_device *pdev, int is_con)
1022 {
1023         struct resource *r;
1024         struct fs_uart_platform_info *pdata = pdev->dev.platform_data;
1025         int idx = pdata->fs_no; /* It is UART_SMCx or UART_SCCx index */
1026         struct uart_cpm_port *pinfo;
1027         int line;
1028         u32 mem, pram;
1029
1030         line = cpm_uart_id2nr(idx);
1031         if(line < 0) {
1032                 printk(KERN_ERR"%s(): port %d is not registered", __FUNCTION__, idx);
1033                 return -1;
1034         }
1035
1036         pinfo = (struct uart_cpm_port *) &cpm_uart_ports[idx];
1037
1038         pinfo->brg = pdata->brg;
1039
1040         if (!is_con) {
1041                 pinfo->port.line = line;
1042                 pinfo->port.flags = UPF_BOOT_AUTOCONF;
1043         }
1044
1045         if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs")))
1046                 return -EINVAL;
1047         mem = r->start;
1048
1049         if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram")))
1050                 return -EINVAL;
1051         pram = r->start;
1052
1053         if(idx > fsid_smc2_uart) {
1054                 pinfo->sccp = (scc_t *)mem;
1055                 pinfo->sccup = (scc_uart_t *)pram;
1056         } else {
1057                 pinfo->smcp = (smc_t *)mem;
1058                 pinfo->smcup = (smc_uart_t *)pram;
1059         }
1060         pinfo->tx_nrfifos = pdata->tx_num_fifo;
1061         pinfo->tx_fifosize = pdata->tx_buf_size;
1062
1063         pinfo->rx_nrfifos = pdata->rx_num_fifo;
1064         pinfo->rx_fifosize = pdata->rx_buf_size;
1065
1066         pinfo->port.uartclk = pdata->uart_clk;
1067         pinfo->port.mapbase = (unsigned long)mem;
1068         pinfo->port.irq = platform_get_irq(pdev, 0);
1069
1070         return 0;
1071 }
1072
1073 #ifdef CONFIG_SERIAL_CPM_CONSOLE
1074 /*
1075  *      Print a string to the serial port trying not to disturb
1076  *      any possible real use of the port...
1077  *
1078  *      Note that this is called with interrupts already disabled
1079  */
1080 static void cpm_uart_console_write(struct console *co, const char *s,
1081                                    u_int count)
1082 {
1083         struct uart_cpm_port *pinfo =
1084             &cpm_uart_ports[cpm_uart_port_map[co->index]];
1085         unsigned int i;
1086         volatile cbd_t *bdp, *bdbase;
1087         volatile unsigned char *cp;
1088
1089         /* Get the address of the host memory buffer.
1090          */
1091         bdp = pinfo->tx_cur;
1092         bdbase = pinfo->tx_bd_base;
1093
1094         /*
1095          * Now, do each character.  This is not as bad as it looks
1096          * since this is a holding FIFO and not a transmitting FIFO.
1097          * We could add the complexity of filling the entire transmit
1098          * buffer, but we would just wait longer between accesses......
1099          */
1100         for (i = 0; i < count; i++, s++) {
1101                 /* Wait for transmitter fifo to empty.
1102                  * Ready indicates output is ready, and xmt is doing
1103                  * that, not that it is ready for us to send.
1104                  */
1105                 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1106                         ;
1107
1108                 /* Send the character out.
1109                  * If the buffer address is in the CPM DPRAM, don't
1110                  * convert it.
1111                  */
1112                 cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
1113
1114                 *cp = *s;
1115
1116                 bdp->cbd_datlen = 1;
1117                 bdp->cbd_sc |= BD_SC_READY;
1118
1119                 if (bdp->cbd_sc & BD_SC_WRAP)
1120                         bdp = bdbase;
1121                 else
1122                         bdp++;
1123
1124                 /* if a LF, also do CR... */
1125                 if (*s == 10) {
1126                         while ((bdp->cbd_sc & BD_SC_READY) != 0)
1127                                 ;
1128
1129                         cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
1130
1131                         *cp = 13;
1132                         bdp->cbd_datlen = 1;
1133                         bdp->cbd_sc |= BD_SC_READY;
1134
1135                         if (bdp->cbd_sc & BD_SC_WRAP)
1136                                 bdp = bdbase;
1137                         else
1138                                 bdp++;
1139                 }
1140         }
1141
1142         /*
1143          * Finally, Wait for transmitter & holding register to empty
1144          *  and restore the IER
1145          */
1146         while ((bdp->cbd_sc & BD_SC_READY) != 0)
1147                 ;
1148
1149         pinfo->tx_cur = (volatile cbd_t *) bdp;
1150 }
1151
1152
1153 static int __init cpm_uart_console_setup(struct console *co, char *options)
1154 {
1155         struct uart_port *port;
1156         struct uart_cpm_port *pinfo;
1157         int baud = 38400;
1158         int bits = 8;
1159         int parity = 'n';
1160         int flow = 'n';
1161         int ret;
1162
1163         struct fs_uart_platform_info *pdata;
1164         struct platform_device* pdev = early_uart_get_pdev(co->index);
1165
1166         if (!pdev) {
1167                 pr_info("cpm_uart: console: compat mode\n");
1168                 /* compatibility - will be cleaned up */
1169                 cpm_uart_init_portdesc();
1170         }
1171
1172         port =
1173             (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]];
1174         pinfo = (struct uart_cpm_port *)port;
1175         if (!pdev) {
1176                 if (pinfo->set_lineif)
1177                         pinfo->set_lineif(pinfo);
1178         } else {
1179                 pdata = pdev->dev.platform_data;
1180                 if (pdata)
1181                         if (pdata->init_ioports)
1182                                 pdata->init_ioports();
1183
1184                 cpm_uart_drv_get_platform_data(pdev, 1);
1185         }
1186
1187         pinfo->flags |= FLAG_CONSOLE;
1188
1189         if (options) {
1190                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1191         } else {
1192                 bd_t *bd = (bd_t *) __res;
1193
1194                 if (bd->bi_baudrate)
1195                         baud = bd->bi_baudrate;
1196                 else
1197                         baud = 9600;
1198         }
1199
1200         if (IS_SMC(pinfo)) {
1201                 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
1202                 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
1203         } else {
1204                 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
1205                 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
1206         }
1207
1208         ret = cpm_uart_allocbuf(pinfo, 1);
1209
1210         if (ret)
1211                 return ret;
1212
1213         cpm_uart_initbd(pinfo);
1214
1215         if (IS_SMC(pinfo))
1216                 cpm_uart_init_smc(pinfo);
1217         else
1218                 cpm_uart_init_scc(pinfo);
1219
1220         uart_set_options(port, co, baud, parity, bits, flow);
1221
1222         return 0;
1223 }
1224
1225 static struct uart_driver cpm_reg;
1226 static struct console cpm_scc_uart_console = {
1227         .name           = "ttyCPM",
1228         .write          = cpm_uart_console_write,
1229         .device         = uart_console_device,
1230         .setup          = cpm_uart_console_setup,
1231         .flags          = CON_PRINTBUFFER,
1232         .index          = -1,
1233         .data           = &cpm_reg,
1234 };
1235
1236 int __init cpm_uart_console_init(void)
1237 {
1238         register_console(&cpm_scc_uart_console);
1239         return 0;
1240 }
1241
1242 console_initcall(cpm_uart_console_init);
1243
1244 #define CPM_UART_CONSOLE        &cpm_scc_uart_console
1245 #else
1246 #define CPM_UART_CONSOLE        NULL
1247 #endif
1248
1249 static struct uart_driver cpm_reg = {
1250         .owner          = THIS_MODULE,
1251         .driver_name    = "ttyCPM",
1252         .dev_name       = "ttyCPM",
1253         .major          = SERIAL_CPM_MAJOR,
1254         .minor          = SERIAL_CPM_MINOR,
1255         .cons           = CPM_UART_CONSOLE,
1256 };
1257 static int cpm_uart_drv_probe(struct device *dev)
1258 {
1259         struct platform_device  *pdev = to_platform_device(dev);
1260         struct fs_uart_platform_info *pdata;
1261         int ret = -ENODEV;
1262
1263         if(!pdev) {
1264                 printk(KERN_ERR"CPM UART: platform data missing!\n");
1265                 return ret;
1266         }
1267
1268         pdata = pdev->dev.platform_data;
1269         pr_debug("cpm_uart_drv_probe: Adding CPM UART %d\n", cpm_uart_id2nr(pdata->fs_no));
1270
1271         if ((ret = cpm_uart_drv_get_platform_data(pdev, 0)))
1272                 return ret;
1273
1274         if (pdata->init_ioports)
1275                 pdata->init_ioports();
1276
1277         ret = uart_add_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port);
1278
1279         return ret;
1280 }
1281
1282 static int cpm_uart_drv_remove(struct device *dev)
1283 {
1284         struct platform_device  *pdev = to_platform_device(dev);
1285         struct fs_uart_platform_info *pdata = pdev->dev.platform_data;
1286
1287         pr_debug("cpm_uart_drv_remove: Removing CPM UART %d\n",
1288                         cpm_uart_id2nr(pdata->fs_no));
1289
1290         uart_remove_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port);
1291         return 0;
1292 }
1293
1294 static struct device_driver cpm_smc_uart_driver = {
1295         .name   = "fsl-cpm-smc:uart",
1296         .bus    = &platform_bus_type,
1297         .probe  = cpm_uart_drv_probe,
1298         .remove = cpm_uart_drv_remove,
1299 };
1300
1301 static struct device_driver cpm_scc_uart_driver = {
1302         .name   = "fsl-cpm-scc:uart",
1303         .bus    = &platform_bus_type,
1304         .probe  = cpm_uart_drv_probe,
1305         .remove = cpm_uart_drv_remove,
1306 };
1307
1308 /*
1309    This is supposed to match uart devices on platform bus,
1310    */
1311 static int match_is_uart (struct device* dev, void* data)
1312 {
1313         struct platform_device* pdev = container_of(dev, struct platform_device, dev);
1314         int ret = 0;
1315         /* this was setfunc as uart */
1316         if(strstr(pdev->name,":uart")) {
1317                 ret = 1;
1318         }
1319         return ret;
1320 }
1321
1322
1323 static int cpm_uart_init(void) {
1324
1325         int ret;
1326         int i;
1327         struct device *dev;
1328         printk(KERN_INFO "Serial: CPM driver $Revision: 0.02 $\n");
1329
1330         /* lookup the bus for uart devices */
1331         dev = bus_find_device(&platform_bus_type, NULL, 0, match_is_uart);
1332
1333         /* There are devices on the bus - all should be OK  */
1334         if (dev) {
1335                 cpm_uart_count();
1336                 cpm_reg.nr = cpm_uart_nr;
1337
1338                 if (!(ret = uart_register_driver(&cpm_reg))) {
1339                         if ((ret = driver_register(&cpm_smc_uart_driver))) {
1340                                 uart_unregister_driver(&cpm_reg);
1341                                 return ret;
1342                         }
1343                         if ((ret = driver_register(&cpm_scc_uart_driver))) {
1344                                 driver_unregister(&cpm_scc_uart_driver);
1345                                 uart_unregister_driver(&cpm_reg);
1346                         }
1347                 }
1348         } else {
1349         /* No capable platform devices found - falling back to legacy mode */
1350                 pr_info("cpm_uart: WARNING: no UART devices found on platform bus!\n");
1351                 pr_info(
1352                 "cpm_uart: the driver will guess configuration, but this mode is no longer supported.\n");
1353 #ifndef CONFIG_SERIAL_CPM_CONSOLE
1354                 ret = cpm_uart_init_portdesc();
1355                 if (ret)
1356                         return ret;
1357 #endif
1358
1359                 cpm_reg.nr = cpm_uart_nr;
1360                 ret = uart_register_driver(&cpm_reg);
1361
1362                 if (ret)
1363                         return ret;
1364
1365                 for (i = 0; i < cpm_uart_nr; i++) {
1366                         int con = cpm_uart_port_map[i];
1367                         cpm_uart_ports[con].port.line = i;
1368                         cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF;
1369                         uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1370                 }
1371
1372         }
1373         return ret;
1374 }
1375
1376 static void __exit cpm_uart_exit(void)
1377 {
1378         driver_unregister(&cpm_scc_uart_driver);
1379         driver_unregister(&cpm_smc_uart_driver);
1380         uart_unregister_driver(&cpm_reg);
1381 }
1382
1383 module_init(cpm_uart_init);
1384 module_exit(cpm_uart_exit);
1385
1386 MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
1387 MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
1388 MODULE_LICENSE("GPL");
1389 MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);