err.no Git - linux-2.6/blob - 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, 2007 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 #include <asm/fs_pd.h>
  50 #include <asm/udbg.h>
  51
  52 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  53 #include <linux/of_platform.h>
  54 #endif
  55
  56 #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  57 #define SUPPORT_SYSRQ
  58 #endif
  59
  60 #include <linux/serial_core.h>
  61 #include <linux/kernel.h>
  62
  63 #include "cpm_uart.h"
  64
  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 #ifndef CONFIG_PPC_CPM_NEW_BINDING
  76 /* Track which ports are configured as uarts */
  77 int cpm_uart_port_map[UART_NR];
  78 /* How many ports did we config as uarts */
  79 int cpm_uart_nr;
  80
  81 /* Place-holder for board-specific stuff */
  82 struct platform_device* __attribute__ ((weak)) __init
  83 early_uart_get_pdev(int index)
  84 {
  85         return NULL;
  86 }
  87
  88
  89 static void cpm_uart_count(void)
  90 {
  91         cpm_uart_nr = 0;
  92 #ifdef CONFIG_SERIAL_CPM_SMC1
  93         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
  94 #endif
  95 #ifdef CONFIG_SERIAL_CPM_SMC2
  96         cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
  97 #endif
  98 #ifdef CONFIG_SERIAL_CPM_SCC1
  99         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
 100 #endif
 101 #ifdef CONFIG_SERIAL_CPM_SCC2
 102         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
 103 #endif
 104 #ifdef CONFIG_SERIAL_CPM_SCC3
 105         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
 106 #endif
 107 #ifdef CONFIG_SERIAL_CPM_SCC4
 108         cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
 109 #endif
 110 }
 111
 112 /* Get UART number by its id */
 113 static int cpm_uart_id2nr(int id)
 114 {
 115         int i;
 116         if (id < UART_NR) {
 117                 for (i=0; i<UART_NR; i++) {
 118                         if (cpm_uart_port_map[i] == id)
 119                                 return i;
 120                 }
 121         }
 122
 123         /* not found or invalid argument */
 124         return -1;
 125 }
 126 #endif
 127
 128 /*
 129  * Check, if transmit buffers are processed
 130 */
 131 static unsigned int cpm_uart_tx_empty(struct uart_port *port)
 132 {
 133         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 134         volatile cbd_t *bdp = pinfo->tx_bd_base;
 135         int ret = 0;
 136
 137         while (1) {
 138                 if (bdp->cbd_sc & BD_SC_READY)
 139                         break;
 140
 141                 if (bdp->cbd_sc & BD_SC_WRAP) {
 142                         ret = TIOCSER_TEMT;
 143                         break;
 144                 }
 145                 bdp++;
 146         }
 147
 148         pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
 149
 150         return ret;
 151 }
 152
 153 static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 154 {
 155         /* Whee. Do nothing. */
 156 }
 157
 158 static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
 159 {
 160         /* Whee. Do nothing. */
 161         return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
 162 }
 163
 164 /*
 165  * Stop transmitter
 166  */
 167 static void cpm_uart_stop_tx(struct uart_port *port)
 168 {
 169         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 170         volatile smc_t *smcp = pinfo->smcp;
 171         volatile scc_t *sccp = pinfo->sccp;
 172
 173         pr_debug("CPM uart[%d]:stop tx\n", port->line);
 174
 175         if (IS_SMC(pinfo))
 176                 smcp->smc_smcm &= ~SMCM_TX;
 177         else
 178                 sccp->scc_sccm &= ~UART_SCCM_TX;
 179 }
 180
 181 /*
 182  * Start transmitter
 183  */
 184 static void cpm_uart_start_tx(struct uart_port *port)
 185 {
 186         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 187         volatile smc_t *smcp = pinfo->smcp;
 188         volatile scc_t *sccp = pinfo->sccp;
 189
 190         pr_debug("CPM uart[%d]:start tx\n", port->line);
 191
 192         if (IS_SMC(pinfo)) {
 193                 if (smcp->smc_smcm & SMCM_TX)
 194                         return;
 195         } else {
 196                 if (sccp->scc_sccm & UART_SCCM_TX)
 197                         return;
 198         }
 199
 200         if (cpm_uart_tx_pump(port) != 0) {
 201                 if (IS_SMC(pinfo)) {
 202                         smcp->smc_smcm |= SMCM_TX;
 203                 } else {
 204                         sccp->scc_sccm |= UART_SCCM_TX;
 205                 }
 206         }
 207 }
 208
 209 /*
 210  * Stop receiver
 211  */
 212 static void cpm_uart_stop_rx(struct uart_port *port)
 213 {
 214         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 215         volatile smc_t *smcp = pinfo->smcp;
 216         volatile scc_t *sccp = pinfo->sccp;
 217
 218         pr_debug("CPM uart[%d]:stop rx\n", port->line);
 219
 220         if (IS_SMC(pinfo))
 221                 smcp->smc_smcm &= ~SMCM_RX;
 222         else
 223                 sccp->scc_sccm &= ~UART_SCCM_RX;
 224 }
 225
 226 /*
 227  * Enable Modem status interrupts
 228  */
 229 static void cpm_uart_enable_ms(struct uart_port *port)
 230 {
 231         pr_debug("CPM uart[%d]:enable ms\n", port->line);
 232 }
 233
 234 /*
 235  * Generate a break.
 236  */
 237 static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
 238 {
 239         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 240
 241         pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
 242                 break_state);
 243
 244         if (break_state)
 245                 cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
 246         else
 247                 cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
 248 }
 249
 250 /*
 251  * Transmit characters, refill buffer descriptor, if possible
 252  */
 253 static void cpm_uart_int_tx(struct uart_port *port)
 254 {
 255         pr_debug("CPM uart[%d]:TX INT\n", port->line);
 256
 257         cpm_uart_tx_pump(port);
 258 }
 259
 260 /*
 261  * Receive characters
 262  */
 263 static void cpm_uart_int_rx(struct uart_port *port)
 264 {
 265         int i;
 266         unsigned char ch, *cp;
 267         struct tty_struct *tty = port->info->tty;
 268         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 269         volatile cbd_t *bdp;
 270         u16 status;
 271         unsigned int flg;
 272
 273         pr_debug("CPM uart[%d]:RX INT\n", port->line);
 274
 275         /* Just loop through the closed BDs and copy the characters into
 276          * the buffer.
 277          */
 278         bdp = pinfo->rx_cur;
 279         for (;;) {
 280                 /* get status */
 281                 status = bdp->cbd_sc;
 282                 /* If this one is empty, return happy */
 283                 if (status & BD_SC_EMPTY)
 284                         break;
 285
 286                 /* get number of characters, and check spce in flip-buffer */
 287                 i = bdp->cbd_datlen;
 288
 289                 /* If we have not enough room in tty flip buffer, then we try
 290                  * later, which will be the next rx-interrupt or a timeout
 291                  */
 292                 if(tty_buffer_request_room(tty, i) < i) {
 293                         printk(KERN_WARNING "No room in flip buffer\n");
 294                         return;
 295                 }
 296
 297                 /* get pointer */
 298                 cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 299
 300                 /* loop through the buffer */
 301                 while (i-- > 0) {
 302                         ch = *cp++;
 303                         port->icount.rx++;
 304                         flg = TTY_NORMAL;
 305
 306                         if (status &
 307                             (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
 308                                 goto handle_error;
 309                         if (uart_handle_sysrq_char(port, ch))
 310                                 continue;
 311
 312                       error_return:
 313                         tty_insert_flip_char(tty, ch, flg);
 314
 315                 }               /* End while (i--) */
 316
 317                 /* This BD is ready to be used again. Clear status. get next */
 318                 bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
 319                 bdp->cbd_sc |= BD_SC_EMPTY;
 320
 321                 if (bdp->cbd_sc & BD_SC_WRAP)
 322                         bdp = pinfo->rx_bd_base;
 323                 else
 324                         bdp++;
 325
 326         } /* End for (;;) */
 327
 328         /* Write back buffer pointer */
 329         pinfo->rx_cur = (volatile cbd_t *) bdp;
 330
 331         /* activate BH processing */
 332         tty_flip_buffer_push(tty);
 333
 334         return;
 335
 336         /* Error processing */
 337
 338       handle_error:
 339         /* Statistics */
 340         if (status & BD_SC_BR)
 341                 port->icount.brk++;
 342         if (status & BD_SC_PR)
 343                 port->icount.parity++;
 344         if (status & BD_SC_FR)
 345                 port->icount.frame++;
 346         if (status & BD_SC_OV)
 347                 port->icount.overrun++;
 348
 349         /* Mask out ignored conditions */
 350         status &= port->read_status_mask;
 351
 352         /* Handle the remaining ones */
 353         if (status & BD_SC_BR)
 354                 flg = TTY_BREAK;
 355         else if (status & BD_SC_PR)
 356                 flg = TTY_PARITY;
 357         else if (status & BD_SC_FR)
 358                 flg = TTY_FRAME;
 359
 360         /* overrun does not affect the current character ! */
 361         if (status & BD_SC_OV) {
 362                 ch = 0;
 363                 flg = TTY_OVERRUN;
 364                 /* We skip this buffer */
 365                 /* CHECK: Is really nothing senseful there */
 366                 /* ASSUMPTION: it contains nothing valid */
 367                 i = 0;
 368         }
 369 #ifdef SUPPORT_SYSRQ
 370         port->sysrq = 0;
 371 #endif
 372         goto error_return;
 373 }
 374
 375 /*
 376  * Asynchron mode interrupt handler
 377  */
 378 static irqreturn_t cpm_uart_int(int irq, void *data)
 379 {
 380         u8 events;
 381         struct uart_port *port = (struct uart_port *)data;
 382         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 383         volatile smc_t *smcp = pinfo->smcp;
 384         volatile scc_t *sccp = pinfo->sccp;
 385
 386         pr_debug("CPM uart[%d]:IRQ\n", port->line);
 387
 388         if (IS_SMC(pinfo)) {
 389                 events = smcp->smc_smce;
 390                 smcp->smc_smce = events;
 391                 if (events & SMCM_BRKE)
 392                         uart_handle_break(port);
 393                 if (events & SMCM_RX)
 394                         cpm_uart_int_rx(port);
 395                 if (events & SMCM_TX)
 396                         cpm_uart_int_tx(port);
 397         } else {
 398                 events = sccp->scc_scce;
 399                 sccp->scc_scce = events;
 400                 if (events & UART_SCCM_BRKE)
 401                         uart_handle_break(port);
 402                 if (events & UART_SCCM_RX)
 403                         cpm_uart_int_rx(port);
 404                 if (events & UART_SCCM_TX)
 405                         cpm_uart_int_tx(port);
 406         }
 407         return (events) ? IRQ_HANDLED : IRQ_NONE;
 408 }
 409
 410 static int cpm_uart_startup(struct uart_port *port)
 411 {
 412         int retval;
 413         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 414
 415         pr_debug("CPM uart[%d]:startup\n", port->line);
 416
 417         /* Install interrupt handler. */
 418         retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
 419         if (retval)
 420                 return retval;
 421
 422         /* Startup rx-int */
 423         if (IS_SMC(pinfo)) {
 424                 pinfo->smcp->smc_smcm |= SMCM_RX;
 425                 pinfo->smcp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);
 426         } else {
 427                 pinfo->sccp->scc_sccm |= UART_SCCM_RX;
 428                 pinfo->sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 429         }
 430
 431         if (!(pinfo->flags & FLAG_CONSOLE))
 432                 cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
 433         return 0;
 434 }
 435
 436 inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
 437 {
 438         set_current_state(TASK_UNINTERRUPTIBLE);
 439         schedule_timeout(pinfo->wait_closing);
 440 }
 441
 442 /*
 443  * Shutdown the uart
 444  */
 445 static void cpm_uart_shutdown(struct uart_port *port)
 446 {
 447         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 448
 449         pr_debug("CPM uart[%d]:shutdown\n", port->line);
 450
 451         /* free interrupt handler */
 452         free_irq(port->irq, port);
 453
 454         /* If the port is not the console, disable Rx and Tx. */
 455         if (!(pinfo->flags & FLAG_CONSOLE)) {
 456                 /* Wait for all the BDs marked sent */
 457                 while(!cpm_uart_tx_empty(port)) {
 458                         set_current_state(TASK_UNINTERRUPTIBLE);
 459                         schedule_timeout(2);
 460                 }
 461
 462                 if (pinfo->wait_closing)
 463                         cpm_uart_wait_until_send(pinfo);
 464
 465                 /* Stop uarts */
 466                 if (IS_SMC(pinfo)) {
 467                         volatile smc_t *smcp = pinfo->smcp;
 468                         smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
 469                         smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
 470                 } else {
 471                         volatile scc_t *sccp = pinfo->sccp;
 472                         sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 473                         sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
 474                 }
 475
 476                 /* Shut them really down and reinit buffer descriptors */
 477                 if (IS_SMC(pinfo))
 478                         cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
 479                 else
 480                         cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
 481
 482                 cpm_uart_initbd(pinfo);
 483         }
 484 }
 485
 486 static void cpm_uart_set_termios(struct uart_port *port,
 487                                  struct ktermios *termios,
 488                                  struct ktermios *old)
 489 {
 490         int baud;
 491         unsigned long flags;
 492         u16 cval, scval, prev_mode;
 493         int bits, sbits;
 494         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 495         volatile smc_t *smcp = pinfo->smcp;
 496         volatile scc_t *sccp = pinfo->sccp;
 497
 498         pr_debug("CPM uart[%d]:set_termios\n", port->line);
 499
 500         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
 501
 502         /* Character length programmed into the mode register is the
 503          * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
 504          * 1 or 2 stop bits, minus 1.
 505          * The value 'bits' counts this for us.
 506          */
 507         cval = 0;
 508         scval = 0;
 509
 510         /* byte size */
 511         switch (termios->c_cflag & CSIZE) {
 512         case CS5:
 513                 bits = 5;
 514                 break;
 515         case CS6:
 516                 bits = 6;
 517                 break;
 518         case CS7:
 519                 bits = 7;
 520                 break;
 521         case CS8:
 522                 bits = 8;
 523                 break;
 524                 /* Never happens, but GCC is too dumb to figure it out */
 525         default:
 526                 bits = 8;
 527                 break;
 528         }
 529         sbits = bits - 5;
 530
 531         if (termios->c_cflag & CSTOPB) {
 532                 cval |= SMCMR_SL;       /* Two stops */
 533                 scval |= SCU_PSMR_SL;
 534                 bits++;
 535         }
 536
 537         if (termios->c_cflag & PARENB) {
 538                 cval |= SMCMR_PEN;
 539                 scval |= SCU_PSMR_PEN;
 540                 bits++;
 541                 if (!(termios->c_cflag & PARODD)) {
 542                         cval |= SMCMR_PM_EVEN;
 543                         scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
 544                 }
 545         }
 546
 547         /*
 548          * Set up parity check flag
 549          */
 550 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 551
 552         port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
 553         if (termios->c_iflag & INPCK)
 554                 port->read_status_mask |= BD_SC_FR | BD_SC_PR;
 555         if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
 556                 port->read_status_mask |= BD_SC_BR;
 557
 558         /*
 559          * Characters to ignore
 560          */
 561         port->ignore_status_mask = 0;
 562         if (termios->c_iflag & IGNPAR)
 563                 port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
 564         if (termios->c_iflag & IGNBRK) {
 565                 port->ignore_status_mask |= BD_SC_BR;
 566                 /*
 567                  * If we're ignore parity and break indicators, ignore
 568                  * overruns too.  (For real raw support).
 569                  */
 570                 if (termios->c_iflag & IGNPAR)
 571                         port->ignore_status_mask |= BD_SC_OV;
 572         }
 573         /*
 574          * !!! ignore all characters if CREAD is not set
 575          */
 576         if ((termios->c_cflag & CREAD) == 0)
 577                 port->read_status_mask &= ~BD_SC_EMPTY;
 578
 579         spin_lock_irqsave(&port->lock, flags);
 580
 581         /* Start bit has not been added (so don't, because we would just
 582          * subtract it later), and we need to add one for the number of
 583          * stops bits (there is always at least one).
 584          */
 585         bits++;
 586         if (IS_SMC(pinfo)) {
 587                 /* Set the mode register.  We want to keep a copy of the
 588                  * enables, because we want to put them back if they were
 589                  * present.
 590                  */
 591                 prev_mode = smcp->smc_smcmr;
 592                 smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART;
 593                 smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
 594         } else {
 595                 sccp->scc_psmr = (sbits << 12) | scval;
 596         }
 597
 598         cpm_set_brg(pinfo->brg - 1, baud);
 599         spin_unlock_irqrestore(&port->lock, flags);
 600 }
 601
 602 static const char *cpm_uart_type(struct uart_port *port)
 603 {
 604         pr_debug("CPM uart[%d]:uart_type\n", port->line);
 605
 606         return port->type == PORT_CPM ? "CPM UART" : NULL;
 607 }
 608
 609 /*
 610  * verify the new serial_struct (for TIOCSSERIAL).
 611  */
 612 static int cpm_uart_verify_port(struct uart_port *port,
 613                                 struct serial_struct *ser)
 614 {
 615         int ret = 0;
 616
 617         pr_debug("CPM uart[%d]:verify_port\n", port->line);
 618
 619         if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
 620                 ret = -EINVAL;
 621         if (ser->irq < 0 || ser->irq >= NR_IRQS)
 622                 ret = -EINVAL;
 623         if (ser->baud_base < 9600)
 624                 ret = -EINVAL;
 625         return ret;
 626 }
 627
 628 /*
 629  * Transmit characters, refill buffer descriptor, if possible
 630  */
 631 static int cpm_uart_tx_pump(struct uart_port *port)
 632 {
 633         volatile cbd_t *bdp;
 634         unsigned char *p;
 635         int count;
 636         struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
 637         struct circ_buf *xmit = &port->info->xmit;
 638
 639         /* Handle xon/xoff */
 640         if (port->x_char) {
 641                 /* Pick next descriptor and fill from buffer */
 642                 bdp = pinfo->tx_cur;
 643
 644                 p = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 645
 646                 *p++ = port->x_char;
 647                 bdp->cbd_datlen = 1;
 648                 bdp->cbd_sc |= BD_SC_READY;
 649                 /* Get next BD. */
 650                 if (bdp->cbd_sc & BD_SC_WRAP)
 651                         bdp = pinfo->tx_bd_base;
 652                 else
 653                         bdp++;
 654                 pinfo->tx_cur = bdp;
 655
 656                 port->icount.tx++;
 657                 port->x_char = 0;
 658                 return 1;
 659         }
 660
 661         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
 662                 cpm_uart_stop_tx(port);
 663                 return 0;
 664         }
 665
 666         /* Pick next descriptor and fill from buffer */
 667         bdp = pinfo->tx_cur;
 668
 669         while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) {
 670                 count = 0;
 671                 p = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 672                 while (count < pinfo->tx_fifosize) {
 673                         *p++ = xmit->buf[xmit->tail];
 674                         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 675                         port->icount.tx++;
 676                         count++;
 677                         if (xmit->head == xmit->tail)
 678                                 break;
 679                 }
 680                 bdp->cbd_datlen = count;
 681                 bdp->cbd_sc |= BD_SC_READY;
 682                 eieio();
 683                 /* Get next BD. */
 684                 if (bdp->cbd_sc & BD_SC_WRAP)
 685                         bdp = pinfo->tx_bd_base;
 686                 else
 687                         bdp++;
 688         }
 689         pinfo->tx_cur = bdp;
 690
 691         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 692                 uart_write_wakeup(port);
 693
 694         if (uart_circ_empty(xmit)) {
 695                 cpm_uart_stop_tx(port);
 696                 return 0;
 697         }
 698
 699         return 1;
 700 }
 701
 702 /*
 703  * init buffer descriptors
 704  */
 705 static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
 706 {
 707         int i;
 708         u8 *mem_addr;
 709         volatile cbd_t *bdp;
 710
 711         pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
 712
 713         /* Set the physical address of the host memory
 714          * buffers in the buffer descriptors, and the
 715          * virtual address for us to work with.
 716          */
 717         mem_addr = pinfo->mem_addr;
 718         bdp = pinfo->rx_cur = pinfo->rx_bd_base;
 719         for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
 720                 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 721                 bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
 722                 mem_addr += pinfo->rx_fifosize;
 723         }
 724
 725         bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 726         bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
 727
 728         /* Set the physical address of the host memory
 729          * buffers in the buffer descriptors, and the
 730          * virtual address for us to work with.
 731          */
 732         mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
 733         bdp = pinfo->tx_cur = pinfo->tx_bd_base;
 734         for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
 735                 bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 736                 bdp->cbd_sc = BD_SC_INTRPT;
 737                 mem_addr += pinfo->tx_fifosize;
 738         }
 739
 740         bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 741         bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT;
 742 }
 743
 744 static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
 745 {
 746         volatile scc_t *scp;
 747         volatile scc_uart_t *sup;
 748
 749         pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
 750
 751         scp = pinfo->sccp;
 752         sup = pinfo->sccup;
 753
 754         /* Store address */
 755         pinfo->sccup->scc_genscc.scc_rbase = (unsigned char *)pinfo->rx_bd_base - DPRAM_BASE;
 756         pinfo->sccup->scc_genscc.scc_tbase = (unsigned char *)pinfo->tx_bd_base - DPRAM_BASE;
 757
 758         /* Set up the uart parameters in the
 759          * parameter ram.
 760          */
 761
 762         cpm_set_scc_fcr(sup);
 763
 764         sup->scc_genscc.scc_mrblr = pinfo->rx_fifosize;
 765         sup->scc_maxidl = pinfo->rx_fifosize;
 766         sup->scc_brkcr = 1;
 767         sup->scc_parec = 0;
 768         sup->scc_frmec = 0;
 769         sup->scc_nosec = 0;
 770         sup->scc_brkec = 0;
 771         sup->scc_uaddr1 = 0;
 772         sup->scc_uaddr2 = 0;
 773         sup->scc_toseq = 0;
 774         sup->scc_char1 = 0x8000;
 775         sup->scc_char2 = 0x8000;
 776         sup->scc_char3 = 0x8000;
 777         sup->scc_char4 = 0x8000;
 778         sup->scc_char5 = 0x8000;
 779         sup->scc_char6 = 0x8000;
 780         sup->scc_char7 = 0x8000;
 781         sup->scc_char8 = 0x8000;
 782         sup->scc_rccm = 0xc0ff;
 783
 784         /* Send the CPM an initialize command.
 785          */
 786         cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
 787
 788         /* Set UART mode, 8 bit, no parity, one stop.
 789          * Enable receive and transmit.
 790          */
 791         scp->scc_gsmrh = 0;
 792         scp->scc_gsmrl =
 793             (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
 794
 795         /* Enable rx interrupts  and clear all pending events.  */
 796         scp->scc_sccm = 0;
 797         scp->scc_scce = 0xffff;
 798         scp->scc_dsr = 0x7e7e;
 799         scp->scc_psmr = 0x3000;
 800
 801         scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
 802 }
 803
 804 static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
 805 {
 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(pinfo, 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 #ifdef CONFIG_PPC_CPM_NEW_BINDING
 932 struct uart_cpm_port cpm_uart_ports[UART_NR];
 933
 934 int cpm_uart_init_port(struct device_node *np, struct uart_cpm_port *pinfo)
 935 {
 936         const u32 *data;
 937         void __iomem *mem, __iomem *pram;
 938         int len;
 939         int ret;
 940
 941         data = of_get_property(np, "fsl,cpm-brg", &len);
 942         if (!data || len != 4) {
 943                 printk(KERN_ERR "CPM UART %s has no/invalid "
 944                                 "fsl,cpm-brg property.\n", np->name);
 945                 return -EINVAL;
 946         }
 947         pinfo->brg = *data;
 948
 949         data = of_get_property(np, "fsl,cpm-command", &len);
 950         if (!data || len != 4) {
 951                 printk(KERN_ERR "CPM UART %s has no/invalid "
 952                                 "fsl,cpm-command property.\n", np->name);
 953                 return -EINVAL;
 954         }
 955         pinfo->command = *data;
 956
 957         mem = of_iomap(np, 0);
 958         if (!mem)
 959                 return -ENOMEM;
 960
 961         pram = of_iomap(np, 1);
 962         if (!pram) {
 963                 ret = -ENOMEM;
 964                 goto out_mem;
 965         }
 966
 967         if (of_device_is_compatible(np, "fsl,cpm1-scc-uart") ||
 968             of_device_is_compatible(np, "fsl,cpm2-scc-uart")) {
 969                 pinfo->sccp = mem;
 970                 pinfo->sccup = pram;
 971         } else if (of_device_is_compatible(np, "fsl,cpm1-smc-uart") ||
 972                    of_device_is_compatible(np, "fsl,cpm2-smc-uart")) {
 973                 pinfo->flags |= FLAG_SMC;
 974                 pinfo->smcp = mem;
 975                 pinfo->smcup = pram;
 976         } else {
 977                 ret = -ENODEV;
 978                 goto out_pram;
 979         }
 980
 981         pinfo->tx_nrfifos = TX_NUM_FIFO;
 982         pinfo->tx_fifosize = TX_BUF_SIZE;
 983         pinfo->rx_nrfifos = RX_NUM_FIFO;
 984         pinfo->rx_fifosize = RX_BUF_SIZE;
 985
 986         pinfo->port.uartclk = ppc_proc_freq;
 987         pinfo->port.mapbase = (unsigned long)mem;
 988         pinfo->port.type = PORT_CPM;
 989         pinfo->port.ops = &cpm_uart_pops,
 990         pinfo->port.iotype = UPIO_MEM;
 991         spin_lock_init(&pinfo->port.lock);
 992
 993         pinfo->port.irq = of_irq_to_resource(np, 0, NULL);
 994         if (pinfo->port.irq == NO_IRQ) {
 995                 ret = -EINVAL;
 996                 goto out_pram;
 997         }
 998
 999         return cpm_uart_request_port(&pinfo->port);
1000
1001 out_pram:
1002         iounmap(pram);
1003 out_mem:
1004         iounmap(mem);
1005         return ret;
1006 }
1007
1008 #else
1009
1010 struct uart_cpm_port cpm_uart_ports[UART_NR] = {
1011         [UART_SMC1] = {
1012                 .port = {
1013                         .irq            = SMC1_IRQ,
1014                         .ops            = &cpm_uart_pops,
1015                         .iotype         = UPIO_MEM,
1016                         .lock           = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SMC1].port.lock),
1017                 },
1018                 .flags = FLAG_SMC,
1019                 .tx_nrfifos = TX_NUM_FIFO,
1020                 .tx_fifosize = TX_BUF_SIZE,
1021                 .rx_nrfifos = RX_NUM_FIFO,
1022                 .rx_fifosize = RX_BUF_SIZE,
1023                 .set_lineif = smc1_lineif,
1024         },
1025         [UART_SMC2] = {
1026                 .port = {
1027                         .irq            = SMC2_IRQ,
1028                         .ops            = &cpm_uart_pops,
1029                         .iotype         = UPIO_MEM,
1030                         .lock           = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SMC2].port.lock),
1031                 },
1032                 .flags = FLAG_SMC,
1033                 .tx_nrfifos = TX_NUM_FIFO,
1034                 .tx_fifosize = TX_BUF_SIZE,
1035                 .rx_nrfifos = RX_NUM_FIFO,
1036                 .rx_fifosize = RX_BUF_SIZE,
1037                 .set_lineif = smc2_lineif,
1038 #ifdef CONFIG_SERIAL_CPM_ALT_SMC2
1039                 .is_portb = 1,
1040 #endif
1041         },
1042         [UART_SCC1] = {
1043                 .port = {
1044                         .irq            = SCC1_IRQ,
1045                         .ops            = &cpm_uart_pops,
1046                         .iotype         = UPIO_MEM,
1047                         .lock           = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC1].port.lock),
1048                 },
1049                 .tx_nrfifos = TX_NUM_FIFO,
1050                 .tx_fifosize = TX_BUF_SIZE,
1051                 .rx_nrfifos = RX_NUM_FIFO,
1052                 .rx_fifosize = RX_BUF_SIZE,
1053                 .set_lineif = scc1_lineif,
1054                 .wait_closing = SCC_WAIT_CLOSING,
1055         },
1056         [UART_SCC2] = {
1057                 .port = {
1058                         .irq            = SCC2_IRQ,
1059                         .ops            = &cpm_uart_pops,
1060                         .iotype         = UPIO_MEM,
1061                         .lock           = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC2].port.lock),
1062                 },
1063                 .tx_nrfifos = TX_NUM_FIFO,
1064                 .tx_fifosize = TX_BUF_SIZE,
1065                 .rx_nrfifos = RX_NUM_FIFO,
1066                 .rx_fifosize = RX_BUF_SIZE,
1067                 .set_lineif = scc2_lineif,
1068                 .wait_closing = SCC_WAIT_CLOSING,
1069         },
1070         [UART_SCC3] = {
1071                 .port = {
1072                         .irq            = SCC3_IRQ,
1073                         .ops            = &cpm_uart_pops,
1074                         .iotype         = UPIO_MEM,
1075                         .lock           = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC3].port.lock),
1076                 },
1077                 .tx_nrfifos = TX_NUM_FIFO,
1078                 .tx_fifosize = TX_BUF_SIZE,
1079                 .rx_nrfifos = RX_NUM_FIFO,
1080                 .rx_fifosize = RX_BUF_SIZE,
1081                 .set_lineif = scc3_lineif,
1082                 .wait_closing = SCC_WAIT_CLOSING,
1083         },
1084         [UART_SCC4] = {
1085                 .port = {
1086                         .irq            = SCC4_IRQ,
1087                         .ops            = &cpm_uart_pops,
1088                         .iotype         = UPIO_MEM,
1089                         .lock           = __SPIN_LOCK_UNLOCKED(cpm_uart_ports[UART_SCC4].port.lock),
1090                 },
1091                 .tx_nrfifos = TX_NUM_FIFO,
1092                 .tx_fifosize = TX_BUF_SIZE,
1093                 .rx_nrfifos = RX_NUM_FIFO,
1094                 .rx_fifosize = RX_BUF_SIZE,
1095                 .set_lineif = scc4_lineif,
1096                 .wait_closing = SCC_WAIT_CLOSING,
1097         },
1098 };
1099
1100 int cpm_uart_drv_get_platform_data(struct platform_device *pdev, int is_con)
1101 {
1102         struct resource *r;
1103         struct fs_uart_platform_info *pdata = pdev->dev.platform_data;
1104         int idx;        /* It is UART_SMCx or UART_SCCx index */
1105         struct uart_cpm_port *pinfo;
1106         int line;
1107         u32 mem, pram;
1108
1109         idx = pdata->fs_no = fs_uart_get_id(pdata);
1110
1111         line = cpm_uart_id2nr(idx);
1112         if(line < 0) {
1113                 printk(KERN_ERR"%s(): port %d is not registered", __FUNCTION__, idx);
1114                 return -EINVAL;
1115         }
1116
1117         pinfo = (struct uart_cpm_port *) &cpm_uart_ports[idx];
1118
1119         pinfo->brg = pdata->brg;
1120
1121         if (!is_con) {
1122                 pinfo->port.line = line;
1123                 pinfo->port.flags = UPF_BOOT_AUTOCONF;
1124         }
1125
1126         if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs")))
1127                 return -EINVAL;
1128         mem = (u32)ioremap(r->start, r->end - r->start + 1);
1129
1130         if (!(r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram")))
1131                 return -EINVAL;
1132         pram = (u32)ioremap(r->start, r->end - r->start + 1);
1133
1134         if(idx > fsid_smc2_uart) {
1135                 pinfo->sccp = (scc_t *)mem;
1136                 pinfo->sccup = (scc_uart_t *)pram;
1137         } else {
1138                 pinfo->smcp = (smc_t *)mem;
1139                 pinfo->smcup = (smc_uart_t *)pram;
1140         }
1141         pinfo->tx_nrfifos = pdata->tx_num_fifo;
1142         pinfo->tx_fifosize = pdata->tx_buf_size;
1143
1144         pinfo->rx_nrfifos = pdata->rx_num_fifo;
1145         pinfo->rx_fifosize = pdata->rx_buf_size;
1146
1147         pinfo->port.uartclk = pdata->uart_clk;
1148         pinfo->port.mapbase = (unsigned long)mem;
1149         pinfo->port.irq = platform_get_irq(pdev, 0);
1150
1151         return 0;
1152 }
1153 #endif
1154
1155 #ifdef CONFIG_SERIAL_CPM_CONSOLE
1156 /*
1157  *      Print a string to the serial port trying not to disturb
1158  *      any possible real use of the port...
1159  *
1160  *      Note that this is called with interrupts already disabled
1161  */
1162 static void cpm_uart_console_write(struct console *co, const char *s,
1163                                    u_int count)
1164 {
1165 #ifdef CONFIG_PPC_CPM_NEW_BINDING
1166         struct uart_cpm_port *pinfo = &cpm_uart_ports[co->index];
1167 #else
1168         struct uart_cpm_port *pinfo =
1169             &cpm_uart_ports[cpm_uart_port_map[co->index]];
1170 #endif
1171         unsigned int i;
1172         volatile cbd_t *bdp, *bdbase;
1173         volatile unsigned char *cp;
1174
1175         /* Get the address of the host memory buffer.
1176          */
1177         bdp = pinfo->tx_cur;
1178         bdbase = pinfo->tx_bd_base;
1179
1180         /*
1181          * Now, do each character.  This is not as bad as it looks
1182          * since this is a holding FIFO and not a transmitting FIFO.
1183          * We could add the complexity of filling the entire transmit
1184          * buffer, but we would just wait longer between accesses......
1185          */
1186         for (i = 0; i < count; i++, s++) {
1187                 /* Wait for transmitter fifo to empty.
1188                  * Ready indicates output is ready, and xmt is doing
1189                  * that, not that it is ready for us to send.
1190                  */
1191                 while ((bdp->cbd_sc & BD_SC_READY) != 0)
1192                         ;
1193
1194                 /* Send the character out.
1195                  * If the buffer address is in the CPM DPRAM, don't
1196                  * convert it.
1197                  */
1198                 cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
1199
1200                 *cp = *s;
1201
1202                 bdp->cbd_datlen = 1;
1203                 bdp->cbd_sc |= BD_SC_READY;
1204
1205                 if (bdp->cbd_sc & BD_SC_WRAP)
1206                         bdp = bdbase;
1207                 else
1208                         bdp++;
1209
1210                 /* if a LF, also do CR... */
1211                 if (*s == 10) {
1212                         while ((bdp->cbd_sc & BD_SC_READY) != 0)
1213                                 ;
1214
1215                         cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
1216
1217                         *cp = 13;
1218                         bdp->cbd_datlen = 1;
1219                         bdp->cbd_sc |= BD_SC_READY;
1220
1221                         if (bdp->cbd_sc & BD_SC_WRAP)
1222                                 bdp = bdbase;
1223                         else
1224                                 bdp++;
1225                 }
1226         }
1227
1228         /*
1229          * Finally, Wait for transmitter & holding register to empty
1230          *  and restore the IER
1231          */
1232         while ((bdp->cbd_sc & BD_SC_READY) != 0)
1233                 ;
1234
1235         pinfo->tx_cur = (volatile cbd_t *) bdp;
1236 }
1237
1238
1239 static int __init cpm_uart_console_setup(struct console *co, char *options)
1240 {
1241         int baud = 38400;
1242         int bits = 8;
1243         int parity = 'n';
1244         int flow = 'n';
1245         int ret;
1246         struct uart_cpm_port *pinfo;
1247         struct uart_port *port;
1248
1249 #ifdef CONFIG_PPC_CPM_NEW_BINDING
1250         struct device_node *np = NULL;
1251         int i = 0;
1252
1253         if (co->index >= UART_NR) {
1254                 printk(KERN_ERR "cpm_uart: console index %d too high\n",
1255                        co->index);
1256                 return -ENODEV;
1257         }
1258
1259         do {
1260                 np = of_find_node_by_type(np, "serial");
1261                 if (!np)
1262                         return -ENODEV;
1263
1264                 if (!of_device_is_compatible(np, "fsl,cpm1-smc-uart") &&
1265                     !of_device_is_compatible(np, "fsl,cpm1-scc-uart") &&
1266                     !of_device_is_compatible(np, "fsl,cpm2-smc-uart") &&
1267                     !of_device_is_compatible(np, "fsl,cpm2-scc-uart"))
1268                         i--;
1269         } while (i++ != co->index);
1270
1271         pinfo = &cpm_uart_ports[co->index];
1272
1273         pinfo->flags |= FLAG_CONSOLE;
1274         port = &pinfo->port;
1275
1276         ret = cpm_uart_init_port(np, pinfo);
1277         of_node_put(np);
1278         if (ret)
1279                 return ret;
1280
1281 #else
1282
1283         struct fs_uart_platform_info *pdata;
1284         struct platform_device* pdev = early_uart_get_pdev(co->index);
1285
1286         if (!pdev) {
1287                 pr_info("cpm_uart: console: compat mode\n");
1288                 /* compatibility - will be cleaned up */
1289                 cpm_uart_init_portdesc();
1290         }
1291
1292         port =
1293             (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]];
1294         pinfo = (struct uart_cpm_port *)port;
1295         if (!pdev) {
1296                 if (pinfo->set_lineif)
1297                         pinfo->set_lineif(pinfo);
1298         } else {
1299                 pdata = pdev->dev.platform_data;
1300                 if (pdata)
1301                         if (pdata->init_ioports)
1302                                 pdata->init_ioports(pdata);
1303
1304                 cpm_uart_drv_get_platform_data(pdev, 1);
1305         }
1306
1307         pinfo->flags |= FLAG_CONSOLE;
1308 #endif
1309
1310         if (options) {
1311                 uart_parse_options(options, &baud, &parity, &bits, &flow);
1312         } else {
1313                 if ((baud = uart_baudrate()) == -1)
1314                         baud = 9600;
1315         }
1316
1317 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
1318         udbg_putc = NULL;
1319 #endif
1320
1321         if (IS_SMC(pinfo)) {
1322                 pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
1323                 pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
1324         } else {
1325                 pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
1326                 pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
1327         }
1328
1329         ret = cpm_uart_allocbuf(pinfo, 1);
1330
1331         if (ret)
1332                 return ret;
1333
1334         cpm_uart_initbd(pinfo);
1335
1336         if (IS_SMC(pinfo))
1337                 cpm_uart_init_smc(pinfo);
1338         else
1339                 cpm_uart_init_scc(pinfo);
1340
1341         uart_set_options(port, co, baud, parity, bits, flow);
1342
1343         return 0;
1344 }
1345
1346 static struct uart_driver cpm_reg;
1347 static struct console cpm_scc_uart_console = {
1348         .name           = "ttyCPM",
1349         .write          = cpm_uart_console_write,
1350         .device         = uart_console_device,
1351         .setup          = cpm_uart_console_setup,
1352         .flags          = CON_PRINTBUFFER,
1353         .index          = -1,
1354         .data           = &cpm_reg,
1355 };
1356
1357 int __init cpm_uart_console_init(void)
1358 {
1359         register_console(&cpm_scc_uart_console);
1360         return 0;
1361 }
1362
1363 console_initcall(cpm_uart_console_init);
1364
1365 #define CPM_UART_CONSOLE        &cpm_scc_uart_console
1366 #else
1367 #define CPM_UART_CONSOLE        NULL
1368 #endif
1369
1370 static struct uart_driver cpm_reg = {
1371         .owner          = THIS_MODULE,
1372         .driver_name    = "ttyCPM",
1373         .dev_name       = "ttyCPM",
1374         .major          = SERIAL_CPM_MAJOR,
1375         .minor          = SERIAL_CPM_MINOR,
1376         .cons           = CPM_UART_CONSOLE,
1377         .nr             = UART_NR,
1378 };
1379
1380 #ifdef CONFIG_PPC_CPM_NEW_BINDING
1381 static int probe_index;
1382
1383 static int __devinit cpm_uart_probe(struct of_device *ofdev,
1384                                     const struct of_device_id *match)
1385 {
1386         int index = probe_index++;
1387         struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
1388         int ret;
1389
1390         pinfo->port.line = index;
1391
1392         if (index >= UART_NR)
1393                 return -ENODEV;
1394
1395         dev_set_drvdata(&ofdev->dev, pinfo);
1396
1397         ret = cpm_uart_init_port(ofdev->node, pinfo);
1398         if (ret)
1399                 return ret;
1400
1401         return uart_add_one_port(&cpm_reg, &pinfo->port);
1402 }
1403
1404 static int __devexit cpm_uart_remove(struct of_device *ofdev)
1405 {
1406         struct uart_cpm_port *pinfo = dev_get_drvdata(&ofdev->dev);
1407         return uart_remove_one_port(&cpm_reg, &pinfo->port);
1408 }
1409
1410 static struct of_device_id cpm_uart_match[] = {
1411         {
1412                 .compatible = "fsl,cpm1-smc-uart",
1413         },
1414         {
1415                 .compatible = "fsl,cpm1-scc-uart",
1416         },
1417         {
1418                 .compatible = "fsl,cpm2-smc-uart",
1419         },
1420         {
1421                 .compatible = "fsl,cpm2-scc-uart",
1422         },
1423         {}
1424 };
1425
1426 static struct of_platform_driver cpm_uart_driver = {
1427         .name = "cpm_uart",
1428         .match_table = cpm_uart_match,
1429         .probe = cpm_uart_probe,
1430         .remove = cpm_uart_remove,
1431  };
1432
1433 static int __init cpm_uart_init(void)
1434 {
1435         int ret = uart_register_driver(&cpm_reg);
1436         if (ret)
1437                 return ret;
1438
1439         ret = of_register_platform_driver(&cpm_uart_driver);
1440         if (ret)
1441                 uart_unregister_driver(&cpm_reg);
1442
1443         return ret;
1444 }
1445
1446 static void __exit cpm_uart_exit(void)
1447 {
1448         of_unregister_platform_driver(&cpm_uart_driver);
1449         uart_unregister_driver(&cpm_reg);
1450 }
1451 #else
1452 static int cpm_uart_drv_probe(struct device *dev)
1453 {
1454         struct platform_device  *pdev = to_platform_device(dev);
1455         struct fs_uart_platform_info *pdata;
1456         int ret = -ENODEV;
1457
1458         if(!pdev) {
1459                 printk(KERN_ERR"CPM UART: platform data missing!\n");
1460                 return ret;
1461         }
1462
1463         pdata = pdev->dev.platform_data;
1464
1465         if ((ret = cpm_uart_drv_get_platform_data(pdev, 0)))
1466                 return ret;
1467
1468         pr_debug("cpm_uart_drv_probe: Adding CPM UART %d\n", cpm_uart_id2nr(pdata->fs_no));
1469
1470         if (pdata->init_ioports)
1471                 pdata->init_ioports(pdata);
1472
1473         ret = uart_add_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port);
1474
1475         return ret;
1476 }
1477
1478 static int cpm_uart_drv_remove(struct device *dev)
1479 {
1480         struct platform_device  *pdev = to_platform_device(dev);
1481         struct fs_uart_platform_info *pdata = pdev->dev.platform_data;
1482
1483         pr_debug("cpm_uart_drv_remove: Removing CPM UART %d\n",
1484                         cpm_uart_id2nr(pdata->fs_no));
1485
1486         uart_remove_one_port(&cpm_reg, &cpm_uart_ports[pdata->fs_no].port);
1487         return 0;
1488 }
1489
1490 static struct device_driver cpm_smc_uart_driver = {
1491         .name   = "fsl-cpm-smc:uart",
1492         .bus    = &platform_bus_type,
1493         .probe  = cpm_uart_drv_probe,
1494         .remove = cpm_uart_drv_remove,
1495 };
1496
1497 static struct device_driver cpm_scc_uart_driver = {
1498         .name   = "fsl-cpm-scc:uart",
1499         .bus    = &platform_bus_type,
1500         .probe  = cpm_uart_drv_probe,
1501         .remove = cpm_uart_drv_remove,
1502 };
1503
1504 /*
1505    This is supposed to match uart devices on platform bus,
1506    */
1507 static int match_is_uart (struct device* dev, void* data)
1508 {
1509         struct platform_device* pdev = container_of(dev, struct platform_device, dev);
1510         int ret = 0;
1511         /* this was setfunc as uart */
1512         if(strstr(pdev->name,":uart")) {
1513                 ret = 1;
1514         }
1515         return ret;
1516 }
1517
1518
1519 static int cpm_uart_init(void) {
1520
1521         int ret;
1522         int i;
1523         struct device *dev;
1524         printk(KERN_INFO "Serial: CPM driver $Revision: 0.02 $\n");
1525
1526         /* lookup the bus for uart devices */
1527         dev = bus_find_device(&platform_bus_type, NULL, 0, match_is_uart);
1528
1529         /* There are devices on the bus - all should be OK  */
1530         if (dev) {
1531                 cpm_uart_count();
1532                 cpm_reg.nr = cpm_uart_nr;
1533
1534                 if (!(ret = uart_register_driver(&cpm_reg))) {
1535                         if ((ret = driver_register(&cpm_smc_uart_driver))) {
1536                                 uart_unregister_driver(&cpm_reg);
1537                                 return ret;
1538                         }
1539                         if ((ret = driver_register(&cpm_scc_uart_driver))) {
1540                                 driver_unregister(&cpm_scc_uart_driver);
1541                                 uart_unregister_driver(&cpm_reg);
1542                         }
1543                 }
1544         } else {
1545         /* No capable platform devices found - falling back to legacy mode */
1546                 pr_info("cpm_uart: WARNING: no UART devices found on platform bus!\n");
1547                 pr_info(
1548                 "cpm_uart: the driver will guess configuration, but this mode is no longer supported.\n");
1549
1550                 /* Don't run this again, if the console driver did it already */
1551                 if (cpm_uart_nr == 0)
1552                         cpm_uart_init_portdesc();
1553
1554                 cpm_reg.nr = cpm_uart_nr;
1555                 ret = uart_register_driver(&cpm_reg);
1556
1557                 if (ret)
1558                         return ret;
1559
1560                 for (i = 0; i < cpm_uart_nr; i++) {
1561                         int con = cpm_uart_port_map[i];
1562                         cpm_uart_ports[con].port.line = i;
1563                         cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF;
1564                         if (cpm_uart_ports[con].set_lineif)
1565                                 cpm_uart_ports[con].set_lineif(&cpm_uart_ports[con]);
1566                         uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port);
1567                 }
1568
1569         }
1570         return ret;
1571 }
1572
1573 static void __exit cpm_uart_exit(void)
1574 {
1575         driver_unregister(&cpm_scc_uart_driver);
1576         driver_unregister(&cpm_smc_uart_driver);
1577         uart_unregister_driver(&cpm_reg);
1578 }
1579 #endif
1580
1581 module_init(cpm_uart_init);
1582 module_exit(cpm_uart_exit);
1583
1584 MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
1585 MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
1586 MODULE_LICENSE("GPL");
1587 MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);