drivers/tty/serial/sa1100.c

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This source file includes following definitions.
sa1100_mctrl_check
sa1100_timeout
sa1100_stop_tx
sa1100_start_tx
sa1100_stop_rx
sa1100_enable_ms
sa1100_rx_chars
sa1100_tx_chars
sa1100_int
sa1100_tx_empty
sa1100_get_mctrl
sa1100_set_mctrl
sa1100_break_ctl
sa1100_startup
sa1100_shutdown
sa1100_set_termios
sa1100_type
sa1100_release_port
sa1100_request_port
sa1100_config_port
sa1100_verify_port
sa1100_init_ports
sa1100_register_uart_fns
sa1100_register_uart
sa1100_console_putchar
sa1100_console_write
sa1100_console_get_options
sa1100_console_setup
sa1100_rs_console_init
sa1100_serial_suspend
sa1100_serial_resume
sa1100_serial_add_one_port
sa1100_serial_probe
sa1100_serial_remove
sa1100_serial_init
sa1100_serial_exit
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Driver for SA11x0 serial ports
   4  *
   5  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   6  *
   7  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
   8  */
   9 
  10 #if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
  11 #define SUPPORT_SYSRQ
  12 #endif
  13 
  14 #include <linux/module.h>
  15 #include <linux/ioport.h>
  16 #include <linux/init.h>
  17 #include <linux/console.h>
  18 #include <linux/sysrq.h>
  19 #include <linux/platform_data/sa11x0-serial.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/tty.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial_core.h>
  24 #include <linux/serial.h>
  25 #include <linux/io.h>
  26 
  27 #include <asm/irq.h>
  28 #include <mach/hardware.h>
  29 #include <mach/irqs.h>
  30 
  31 #include "serial_mctrl_gpio.h"
  32 
  33 /* We've been assigned a range on the "Low-density serial ports" major */
  34 #define SERIAL_SA1100_MAJOR     204
  35 #define MINOR_START             5
  36 
  37 #define NR_PORTS                3
  38 
  39 #define SA1100_ISR_PASS_LIMIT   256
  40 
  41 /*
  42  * Convert from ignore_status_mask or read_status_mask to UTSR[01]
  43  */
  44 #define SM_TO_UTSR0(x)  ((x) & 0xff)
  45 #define SM_TO_UTSR1(x)  ((x) >> 8)
  46 #define UTSR0_TO_SM(x)  ((x))
  47 #define UTSR1_TO_SM(x)  ((x) << 8)
  48 
  49 #define UART_GET_UTCR0(sport)   __raw_readl((sport)->port.membase + UTCR0)
  50 #define UART_GET_UTCR1(sport)   __raw_readl((sport)->port.membase + UTCR1)
  51 #define UART_GET_UTCR2(sport)   __raw_readl((sport)->port.membase + UTCR2)
  52 #define UART_GET_UTCR3(sport)   __raw_readl((sport)->port.membase + UTCR3)
  53 #define UART_GET_UTSR0(sport)   __raw_readl((sport)->port.membase + UTSR0)
  54 #define UART_GET_UTSR1(sport)   __raw_readl((sport)->port.membase + UTSR1)
  55 #define UART_GET_CHAR(sport)    __raw_readl((sport)->port.membase + UTDR)
  56 
  57 #define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
  58 #define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
  59 #define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
  60 #define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
  61 #define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
  62 #define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
  63 #define UART_PUT_CHAR(sport,v)  __raw_writel((v),(sport)->port.membase + UTDR)
  64 
  65 /*
  66  * This is the size of our serial port register set.
  67  */
  68 #define UART_PORT_SIZE  0x24
  69 
  70 /*
  71  * This determines how often we check the modem status signals
  72  * for any change.  They generally aren't connected to an IRQ
  73  * so we have to poll them.  We also check immediately before
  74  * filling the TX fifo incase CTS has been dropped.
  75  */
  76 #define MCTRL_TIMEOUT   (250*HZ/1000)
  77 
  78 struct sa1100_port {
  79         struct uart_port        port;
  80         struct timer_list       timer;
  81         unsigned int            old_status;
  82         struct mctrl_gpios      *gpios;
  83 };
  84 
  85 /*
  86  * Handle any change of modem status signal since we were last called.
  87  */
  88 static void sa1100_mctrl_check(struct sa1100_port *sport)
  89 {
  90         unsigned int status, changed;
  91 
  92         status = sport->port.ops->get_mctrl(&sport->port);
  93         changed = status ^ sport->old_status;
  94 
  95         if (changed == 0)
  96                 return;
  97 
  98         sport->old_status = status;
  99 
 100         if (changed & TIOCM_RI)
 101                 sport->port.icount.rng++;
 102         if (changed & TIOCM_DSR)
 103                 sport->port.icount.dsr++;
 104         if (changed & TIOCM_CAR)
 105                 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
 106         if (changed & TIOCM_CTS)
 107                 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
 108 
 109         wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 110 }
 111 
 112 /*
 113  * This is our per-port timeout handler, for checking the
 114  * modem status signals.
 115  */
 116 static void sa1100_timeout(struct timer_list *t)
 117 {
 118         struct sa1100_port *sport = from_timer(sport, t, timer);
 119         unsigned long flags;
 120 
 121         if (sport->port.state) {
 122                 spin_lock_irqsave(&sport->port.lock, flags);
 123                 sa1100_mctrl_check(sport);
 124                 spin_unlock_irqrestore(&sport->port.lock, flags);
 125 
 126                 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
 127         }
 128 }
 129 
 130 /*
 131  * interrupts disabled on entry
 132  */
 133 static void sa1100_stop_tx(struct uart_port *port)
 134 {
 135         struct sa1100_port *sport =
 136                 container_of(port, struct sa1100_port, port);
 137         u32 utcr3;
 138 
 139         utcr3 = UART_GET_UTCR3(sport);
 140         UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
 141         sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
 142 }
 143 
 144 /*
 145  * port locked and interrupts disabled
 146  */
 147 static void sa1100_start_tx(struct uart_port *port)
 148 {
 149         struct sa1100_port *sport =
 150                 container_of(port, struct sa1100_port, port);
 151         u32 utcr3;
 152 
 153         utcr3 = UART_GET_UTCR3(sport);
 154         sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
 155         UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
 156 }
 157 
 158 /*
 159  * Interrupts enabled
 160  */
 161 static void sa1100_stop_rx(struct uart_port *port)
 162 {
 163         struct sa1100_port *sport =
 164                 container_of(port, struct sa1100_port, port);
 165         u32 utcr3;
 166 
 167         utcr3 = UART_GET_UTCR3(sport);
 168         UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
 169 }
 170 
 171 /*
 172  * Set the modem control timer to fire immediately.
 173  */
 174 static void sa1100_enable_ms(struct uart_port *port)
 175 {
 176         struct sa1100_port *sport =
 177                 container_of(port, struct sa1100_port, port);
 178 
 179         mod_timer(&sport->timer, jiffies);
 180 
 181         mctrl_gpio_enable_ms(sport->gpios);
 182 }
 183 
 184 static void
 185 sa1100_rx_chars(struct sa1100_port *sport)
 186 {
 187         unsigned int status, ch, flg;
 188 
 189         status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
 190                  UTSR0_TO_SM(UART_GET_UTSR0(sport));
 191         while (status & UTSR1_TO_SM(UTSR1_RNE)) {
 192                 ch = UART_GET_CHAR(sport);
 193 
 194                 sport->port.icount.rx++;
 195 
 196                 flg = TTY_NORMAL;
 197 
 198                 /*
 199                  * note that the error handling code is
 200                  * out of the main execution path
 201                  */
 202                 if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
 203                         if (status & UTSR1_TO_SM(UTSR1_PRE))
 204                                 sport->port.icount.parity++;
 205                         else if (status & UTSR1_TO_SM(UTSR1_FRE))
 206                                 sport->port.icount.frame++;
 207                         if (status & UTSR1_TO_SM(UTSR1_ROR))
 208                                 sport->port.icount.overrun++;
 209 
 210                         status &= sport->port.read_status_mask;
 211 
 212                         if (status & UTSR1_TO_SM(UTSR1_PRE))
 213                                 flg = TTY_PARITY;
 214                         else if (status & UTSR1_TO_SM(UTSR1_FRE))
 215                                 flg = TTY_FRAME;
 216 
 217 #ifdef SUPPORT_SYSRQ
 218                         sport->port.sysrq = 0;
 219 #endif
 220                 }
 221 
 222                 if (uart_handle_sysrq_char(&sport->port, ch))
 223                         goto ignore_char;
 224 
 225                 uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
 226 
 227         ignore_char:
 228                 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
 229                          UTSR0_TO_SM(UART_GET_UTSR0(sport));
 230         }
 231 
 232         spin_unlock(&sport->port.lock);
 233         tty_flip_buffer_push(&sport->port.state->port);
 234         spin_lock(&sport->port.lock);
 235 }
 236 
 237 static void sa1100_tx_chars(struct sa1100_port *sport)
 238 {
 239         struct circ_buf *xmit = &sport->port.state->xmit;
 240 
 241         if (sport->port.x_char) {
 242                 UART_PUT_CHAR(sport, sport->port.x_char);
 243                 sport->port.icount.tx++;
 244                 sport->port.x_char = 0;
 245                 return;
 246         }
 247 
 248         /*
 249          * Check the modem control lines before
 250          * transmitting anything.
 251          */
 252         sa1100_mctrl_check(sport);
 253 
 254         if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
 255                 sa1100_stop_tx(&sport->port);
 256                 return;
 257         }
 258 
 259         /*
 260          * Tried using FIFO (not checking TNF) for fifo fill:
 261          * still had the '4 bytes repeated' problem.
 262          */
 263         while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
 264                 UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
 265                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 266                 sport->port.icount.tx++;
 267                 if (uart_circ_empty(xmit))
 268                         break;
 269         }
 270 
 271         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 272                 uart_write_wakeup(&sport->port);
 273 
 274         if (uart_circ_empty(xmit))
 275                 sa1100_stop_tx(&sport->port);
 276 }
 277 
 278 static irqreturn_t sa1100_int(int irq, void *dev_id)
 279 {
 280         struct sa1100_port *sport = dev_id;
 281         unsigned int status, pass_counter = 0;
 282 
 283         spin_lock(&sport->port.lock);
 284         status = UART_GET_UTSR0(sport);
 285         status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
 286         do {
 287                 if (status & (UTSR0_RFS | UTSR0_RID)) {
 288                         /* Clear the receiver idle bit, if set */
 289                         if (status & UTSR0_RID)
 290                                 UART_PUT_UTSR0(sport, UTSR0_RID);
 291                         sa1100_rx_chars(sport);
 292                 }
 293 
 294                 /* Clear the relevant break bits */
 295                 if (status & (UTSR0_RBB | UTSR0_REB))
 296                         UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
 297 
 298                 if (status & UTSR0_RBB)
 299                         sport->port.icount.brk++;
 300 
 301                 if (status & UTSR0_REB)
 302                         uart_handle_break(&sport->port);
 303 
 304                 if (status & UTSR0_TFS)
 305                         sa1100_tx_chars(sport);
 306                 if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
 307                         break;
 308                 status = UART_GET_UTSR0(sport);
 309                 status &= SM_TO_UTSR0(sport->port.read_status_mask) |
 310                           ~UTSR0_TFS;
 311         } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
 312         spin_unlock(&sport->port.lock);
 313 
 314         return IRQ_HANDLED;
 315 }
 316 
 317 /*
 318  * Return TIOCSER_TEMT when transmitter is not busy.
 319  */
 320 static unsigned int sa1100_tx_empty(struct uart_port *port)
 321 {
 322         struct sa1100_port *sport =
 323                 container_of(port, struct sa1100_port, port);
 324 
 325         return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
 326 }
 327 
 328 static unsigned int sa1100_get_mctrl(struct uart_port *port)
 329 {
 330         struct sa1100_port *sport =
 331                 container_of(port, struct sa1100_port, port);
 332         int ret = TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 333 
 334         mctrl_gpio_get(sport->gpios, &ret);
 335 
 336         return ret;
 337 }
 338 
 339 static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
 340 {
 341         struct sa1100_port *sport =
 342                 container_of(port, struct sa1100_port, port);
 343 
 344         mctrl_gpio_set(sport->gpios, mctrl);
 345 }
 346 
 347 /*
 348  * Interrupts always disabled.
 349  */
 350 static void sa1100_break_ctl(struct uart_port *port, int break_state)
 351 {
 352         struct sa1100_port *sport =
 353                 container_of(port, struct sa1100_port, port);
 354         unsigned long flags;
 355         unsigned int utcr3;
 356 
 357         spin_lock_irqsave(&sport->port.lock, flags);
 358         utcr3 = UART_GET_UTCR3(sport);
 359         if (break_state == -1)
 360                 utcr3 |= UTCR3_BRK;
 361         else
 362                 utcr3 &= ~UTCR3_BRK;
 363         UART_PUT_UTCR3(sport, utcr3);
 364         spin_unlock_irqrestore(&sport->port.lock, flags);
 365 }
 366 
 367 static int sa1100_startup(struct uart_port *port)
 368 {
 369         struct sa1100_port *sport =
 370                 container_of(port, struct sa1100_port, port);
 371         int retval;
 372 
 373         /*
 374          * Allocate the IRQ
 375          */
 376         retval = request_irq(sport->port.irq, sa1100_int, 0,
 377                              "sa11x0-uart", sport);
 378         if (retval)
 379                 return retval;
 380 
 381         /*
 382          * Finally, clear and enable interrupts
 383          */
 384         UART_PUT_UTSR0(sport, -1);
 385         UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
 386 
 387         /*
 388          * Enable modem status interrupts
 389          */
 390         spin_lock_irq(&sport->port.lock);
 391         sa1100_enable_ms(&sport->port);
 392         spin_unlock_irq(&sport->port.lock);
 393 
 394         return 0;
 395 }
 396 
 397 static void sa1100_shutdown(struct uart_port *port)
 398 {
 399         struct sa1100_port *sport =
 400                 container_of(port, struct sa1100_port, port);
 401 
 402         /*
 403          * Stop our timer.
 404          */
 405         del_timer_sync(&sport->timer);
 406 
 407         /*
 408          * Free the interrupt
 409          */
 410         free_irq(sport->port.irq, sport);
 411 
 412         /*
 413          * Disable all interrupts, port and break condition.
 414          */
 415         UART_PUT_UTCR3(sport, 0);
 416 }
 417 
 418 static void
 419 sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
 420                    struct ktermios *old)
 421 {
 422         struct sa1100_port *sport =
 423                 container_of(port, struct sa1100_port, port);
 424         unsigned long flags;
 425         unsigned int utcr0, old_utcr3, baud, quot;
 426         unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
 427 
 428         /*
 429          * We only support CS7 and CS8.
 430          */
 431         while ((termios->c_cflag & CSIZE) != CS7 &&
 432                (termios->c_cflag & CSIZE) != CS8) {
 433                 termios->c_cflag &= ~CSIZE;
 434                 termios->c_cflag |= old_csize;
 435                 old_csize = CS8;
 436         }
 437 
 438         if ((termios->c_cflag & CSIZE) == CS8)
 439                 utcr0 = UTCR0_DSS;
 440         else
 441                 utcr0 = 0;
 442 
 443         if (termios->c_cflag & CSTOPB)
 444                 utcr0 |= UTCR0_SBS;
 445         if (termios->c_cflag & PARENB) {
 446                 utcr0 |= UTCR0_PE;
 447                 if (!(termios->c_cflag & PARODD))
 448                         utcr0 |= UTCR0_OES;
 449         }
 450 
 451         /*
 452          * Ask the core to calculate the divisor for us.
 453          */
 454         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
 455         quot = uart_get_divisor(port, baud);
 456 
 457         spin_lock_irqsave(&sport->port.lock, flags);
 458 
 459         sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
 460         sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
 461         if (termios->c_iflag & INPCK)
 462                 sport->port.read_status_mask |=
 463                                 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
 464         if (termios->c_iflag & (BRKINT | PARMRK))
 465                 sport->port.read_status_mask |=
 466                                 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
 467 
 468         /*
 469          * Characters to ignore
 470          */
 471         sport->port.ignore_status_mask = 0;
 472         if (termios->c_iflag & IGNPAR)
 473                 sport->port.ignore_status_mask |=
 474                                 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
 475         if (termios->c_iflag & IGNBRK) {
 476                 sport->port.ignore_status_mask |=
 477                                 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
 478                 /*
 479                  * If we're ignoring parity and break indicators,
 480                  * ignore overruns too (for real raw support).
 481                  */
 482                 if (termios->c_iflag & IGNPAR)
 483                         sport->port.ignore_status_mask |=
 484                                 UTSR1_TO_SM(UTSR1_ROR);
 485         }
 486 
 487         del_timer_sync(&sport->timer);
 488 
 489         /*
 490          * Update the per-port timeout.
 491          */
 492         uart_update_timeout(port, termios->c_cflag, baud);
 493 
 494         /*
 495          * disable interrupts and drain transmitter
 496          */
 497         old_utcr3 = UART_GET_UTCR3(sport);
 498         UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
 499 
 500         while (UART_GET_UTSR1(sport) & UTSR1_TBY)
 501                 barrier();
 502 
 503         /* then, disable everything */
 504         UART_PUT_UTCR3(sport, 0);
 505 
 506         /* set the parity, stop bits and data size */
 507         UART_PUT_UTCR0(sport, utcr0);
 508 
 509         /* set the baud rate */
 510         quot -= 1;
 511         UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
 512         UART_PUT_UTCR2(sport, (quot & 0xff));
 513 
 514         UART_PUT_UTSR0(sport, -1);
 515 
 516         UART_PUT_UTCR3(sport, old_utcr3);
 517 
 518         if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
 519                 sa1100_enable_ms(&sport->port);
 520 
 521         spin_unlock_irqrestore(&sport->port.lock, flags);
 522 }
 523 
 524 static const char *sa1100_type(struct uart_port *port)
 525 {
 526         struct sa1100_port *sport =
 527                 container_of(port, struct sa1100_port, port);
 528 
 529         return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
 530 }
 531 
 532 /*
 533  * Release the memory region(s) being used by 'port'.
 534  */
 535 static void sa1100_release_port(struct uart_port *port)
 536 {
 537         struct sa1100_port *sport =
 538                 container_of(port, struct sa1100_port, port);
 539 
 540         release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
 541 }
 542 
 543 /*
 544  * Request the memory region(s) being used by 'port'.
 545  */
 546 static int sa1100_request_port(struct uart_port *port)
 547 {
 548         struct sa1100_port *sport =
 549                 container_of(port, struct sa1100_port, port);
 550 
 551         return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
 552                         "sa11x0-uart") != NULL ? 0 : -EBUSY;
 553 }
 554 
 555 /*
 556  * Configure/autoconfigure the port.
 557  */
 558 static void sa1100_config_port(struct uart_port *port, int flags)
 559 {
 560         struct sa1100_port *sport =
 561                 container_of(port, struct sa1100_port, port);
 562 
 563         if (flags & UART_CONFIG_TYPE &&
 564             sa1100_request_port(&sport->port) == 0)
 565                 sport->port.type = PORT_SA1100;
 566 }
 567 
 568 /*
 569  * Verify the new serial_struct (for TIOCSSERIAL).
 570  * The only change we allow are to the flags and type, and
 571  * even then only between PORT_SA1100 and PORT_UNKNOWN
 572  */
 573 static int
 574 sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
 575 {
 576         struct sa1100_port *sport =
 577                 container_of(port, struct sa1100_port, port);
 578         int ret = 0;
 579 
 580         if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
 581                 ret = -EINVAL;
 582         if (sport->port.irq != ser->irq)
 583                 ret = -EINVAL;
 584         if (ser->io_type != SERIAL_IO_MEM)
 585                 ret = -EINVAL;
 586         if (sport->port.uartclk / 16 != ser->baud_base)
 587                 ret = -EINVAL;
 588         if ((void *)sport->port.mapbase != ser->iomem_base)
 589                 ret = -EINVAL;
 590         if (sport->port.iobase != ser->port)
 591                 ret = -EINVAL;
 592         if (ser->hub6 != 0)
 593                 ret = -EINVAL;
 594         return ret;
 595 }
 596 
 597 static struct uart_ops sa1100_pops = {
 598         .tx_empty       = sa1100_tx_empty,
 599         .set_mctrl      = sa1100_set_mctrl,
 600         .get_mctrl      = sa1100_get_mctrl,
 601         .stop_tx        = sa1100_stop_tx,
 602         .start_tx       = sa1100_start_tx,
 603         .stop_rx        = sa1100_stop_rx,
 604         .enable_ms      = sa1100_enable_ms,
 605         .break_ctl      = sa1100_break_ctl,
 606         .startup        = sa1100_startup,
 607         .shutdown       = sa1100_shutdown,
 608         .set_termios    = sa1100_set_termios,
 609         .type           = sa1100_type,
 610         .release_port   = sa1100_release_port,
 611         .request_port   = sa1100_request_port,
 612         .config_port    = sa1100_config_port,
 613         .verify_port    = sa1100_verify_port,
 614 };
 615 
 616 static struct sa1100_port sa1100_ports[NR_PORTS];
 617 
 618 /*
 619  * Setup the SA1100 serial ports.  Note that we don't include the IrDA
 620  * port here since we have our own SIR/FIR driver (see drivers/net/irda)
 621  *
 622  * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
 623  * Which serial port this ends up being depends on the machine you're
 624  * running this kernel on.  I'm not convinced that this is a good idea,
 625  * but that's the way it traditionally works.
 626  *
 627  * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
 628  * used here.
 629  */
 630 static void __init sa1100_init_ports(void)
 631 {
 632         static int first = 1;
 633         int i;
 634 
 635         if (!first)
 636                 return;
 637         first = 0;
 638 
 639         for (i = 0; i < NR_PORTS; i++) {
 640                 sa1100_ports[i].port.uartclk   = 3686400;
 641                 sa1100_ports[i].port.ops       = &sa1100_pops;
 642                 sa1100_ports[i].port.fifosize  = 8;
 643                 sa1100_ports[i].port.line      = i;
 644                 sa1100_ports[i].port.iotype    = UPIO_MEM;
 645                 timer_setup(&sa1100_ports[i].timer, sa1100_timeout, 0);
 646         }
 647 
 648         /*
 649          * make transmit lines outputs, so that when the port
 650          * is closed, the output is in the MARK state.
 651          */
 652         PPDR |= PPC_TXD1 | PPC_TXD3;
 653         PPSR |= PPC_TXD1 | PPC_TXD3;
 654 }
 655 
 656 void sa1100_register_uart_fns(struct sa1100_port_fns *fns)
 657 {
 658         if (fns->get_mctrl)
 659                 sa1100_pops.get_mctrl = fns->get_mctrl;
 660         if (fns->set_mctrl)
 661                 sa1100_pops.set_mctrl = fns->set_mctrl;
 662 
 663         sa1100_pops.pm       = fns->pm;
 664         /*
 665          * FIXME: fns->set_wake is unused - this should be called from
 666          * the suspend() callback if device_may_wakeup(dev)) is set.
 667          */
 668 }
 669 
 670 void __init sa1100_register_uart(int idx, int port)
 671 {
 672         if (idx >= NR_PORTS) {
 673                 printk(KERN_ERR "%s: bad index number %d\n", __func__, idx);
 674                 return;
 675         }
 676 
 677         switch (port) {
 678         case 1:
 679                 sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
 680                 sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
 681                 sa1100_ports[idx].port.irq     = IRQ_Ser1UART;
 682                 sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
 683                 break;
 684 
 685         case 2:
 686                 sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
 687                 sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
 688                 sa1100_ports[idx].port.irq     = IRQ_Ser2ICP;
 689                 sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
 690                 break;
 691 
 692         case 3:
 693                 sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
 694                 sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
 695                 sa1100_ports[idx].port.irq     = IRQ_Ser3UART;
 696                 sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
 697                 break;
 698 
 699         default:
 700                 printk(KERN_ERR "%s: bad port number %d\n", __func__, port);
 701         }
 702 }
 703 
 704 
 705 #ifdef CONFIG_SERIAL_SA1100_CONSOLE
 706 static void sa1100_console_putchar(struct uart_port *port, int ch)
 707 {
 708         struct sa1100_port *sport =
 709                 container_of(port, struct sa1100_port, port);
 710 
 711         while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
 712                 barrier();
 713         UART_PUT_CHAR(sport, ch);
 714 }
 715 
 716 /*
 717  * Interrupts are disabled on entering
 718  */
 719 static void
 720 sa1100_console_write(struct console *co, const char *s, unsigned int count)
 721 {
 722         struct sa1100_port *sport = &sa1100_ports[co->index];
 723         unsigned int old_utcr3, status;
 724 
 725         /*
 726          *      First, save UTCR3 and then disable interrupts
 727          */
 728         old_utcr3 = UART_GET_UTCR3(sport);
 729         UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
 730                                 UTCR3_TXE);
 731 
 732         uart_console_write(&sport->port, s, count, sa1100_console_putchar);
 733 
 734         /*
 735          *      Finally, wait for transmitter to become empty
 736          *      and restore UTCR3
 737          */
 738         do {
 739                 status = UART_GET_UTSR1(sport);
 740         } while (status & UTSR1_TBY);
 741         UART_PUT_UTCR3(sport, old_utcr3);
 742 }
 743 
 744 /*
 745  * If the port was already initialised (eg, by a boot loader),
 746  * try to determine the current setup.
 747  */
 748 static void __init
 749 sa1100_console_get_options(struct sa1100_port *sport, int *baud,
 750                            int *parity, int *bits)
 751 {
 752         unsigned int utcr3;
 753 
 754         utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
 755         if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
 756                 /* ok, the port was enabled */
 757                 unsigned int utcr0, quot;
 758 
 759                 utcr0 = UART_GET_UTCR0(sport);
 760 
 761                 *parity = 'n';
 762                 if (utcr0 & UTCR0_PE) {
 763                         if (utcr0 & UTCR0_OES)
 764                                 *parity = 'e';
 765                         else
 766                                 *parity = 'o';
 767                 }
 768 
 769                 if (utcr0 & UTCR0_DSS)
 770                         *bits = 8;
 771                 else
 772                         *bits = 7;
 773 
 774                 quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
 775                 quot &= 0xfff;
 776                 *baud = sport->port.uartclk / (16 * (quot + 1));
 777         }
 778 }
 779 
 780 static int __init
 781 sa1100_console_setup(struct console *co, char *options)
 782 {
 783         struct sa1100_port *sport;
 784         int baud = 9600;
 785         int bits = 8;
 786         int parity = 'n';
 787         int flow = 'n';
 788 
 789         /*
 790          * Check whether an invalid uart number has been specified, and
 791          * if so, search for the first available port that does have
 792          * console support.
 793          */
 794         if (co->index == -1 || co->index >= NR_PORTS)
 795                 co->index = 0;
 796         sport = &sa1100_ports[co->index];
 797 
 798         if (options)
 799                 uart_parse_options(options, &baud, &parity, &bits, &flow);
 800         else
 801                 sa1100_console_get_options(sport, &baud, &parity, &bits);
 802 
 803         return uart_set_options(&sport->port, co, baud, parity, bits, flow);
 804 }
 805 
 806 static struct uart_driver sa1100_reg;
 807 static struct console sa1100_console = {
 808         .name           = "ttySA",
 809         .write          = sa1100_console_write,
 810         .device         = uart_console_device,
 811         .setup          = sa1100_console_setup,
 812         .flags          = CON_PRINTBUFFER,
 813         .index          = -1,
 814         .data           = &sa1100_reg,
 815 };
 816 
 817 static int __init sa1100_rs_console_init(void)
 818 {
 819         sa1100_init_ports();
 820         register_console(&sa1100_console);
 821         return 0;
 822 }
 823 console_initcall(sa1100_rs_console_init);
 824 
 825 #define SA1100_CONSOLE  &sa1100_console
 826 #else
 827 #define SA1100_CONSOLE  NULL
 828 #endif
 829 
 830 static struct uart_driver sa1100_reg = {
 831         .owner                  = THIS_MODULE,
 832         .driver_name            = "ttySA",
 833         .dev_name               = "ttySA",
 834         .major                  = SERIAL_SA1100_MAJOR,
 835         .minor                  = MINOR_START,
 836         .nr                     = NR_PORTS,
 837         .cons                   = SA1100_CONSOLE,
 838 };
 839 
 840 static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
 841 {
 842         struct sa1100_port *sport = platform_get_drvdata(dev);
 843 
 844         if (sport)
 845                 uart_suspend_port(&sa1100_reg, &sport->port);
 846 
 847         return 0;
 848 }
 849 
 850 static int sa1100_serial_resume(struct platform_device *dev)
 851 {
 852         struct sa1100_port *sport = platform_get_drvdata(dev);
 853 
 854         if (sport)
 855                 uart_resume_port(&sa1100_reg, &sport->port);
 856 
 857         return 0;
 858 }
 859 
 860 static int sa1100_serial_add_one_port(struct sa1100_port *sport, struct platform_device *dev)
 861 {
 862         sport->port.dev = &dev->dev;
 863 
 864         // mctrl_gpio_init() requires that the GPIO driver supports interrupts,
 865         // but we need to support GPIO drivers for hardware that has no such
 866         // interrupts.  Use mctrl_gpio_init_noauto() instead.
 867         sport->gpios = mctrl_gpio_init_noauto(sport->port.dev, 0);
 868         if (IS_ERR(sport->gpios)) {
 869                 int err = PTR_ERR(sport->gpios);
 870 
 871                 dev_err(sport->port.dev, "failed to get mctrl gpios: %d\n",
 872                         err);
 873 
 874                 if (err == -EPROBE_DEFER)
 875                         return err;
 876 
 877                 sport->gpios = NULL;
 878         }
 879 
 880         platform_set_drvdata(dev, sport);
 881 
 882         return uart_add_one_port(&sa1100_reg, &sport->port);
 883 }
 884 
 885 static int sa1100_serial_probe(struct platform_device *dev)
 886 {
 887         struct resource *res = dev->resource;
 888         int i;
 889 
 890         for (i = 0; i < dev->num_resources; i++, res++)
 891                 if (res->flags & IORESOURCE_MEM)
 892                         break;
 893 
 894         if (i < dev->num_resources) {
 895                 for (i = 0; i < NR_PORTS; i++) {
 896                         if (sa1100_ports[i].port.mapbase != res->start)
 897                                 continue;
 898 
 899                         sa1100_serial_add_one_port(&sa1100_ports[i], dev);
 900                         break;
 901                 }
 902         }
 903 
 904         return 0;
 905 }
 906 
 907 static int sa1100_serial_remove(struct platform_device *pdev)
 908 {
 909         struct sa1100_port *sport = platform_get_drvdata(pdev);
 910 
 911         if (sport)
 912                 uart_remove_one_port(&sa1100_reg, &sport->port);
 913 
 914         return 0;
 915 }
 916 
 917 static struct platform_driver sa11x0_serial_driver = {
 918         .probe          = sa1100_serial_probe,
 919         .remove         = sa1100_serial_remove,
 920         .suspend        = sa1100_serial_suspend,
 921         .resume         = sa1100_serial_resume,
 922         .driver         = {
 923                 .name   = "sa11x0-uart",
 924         },
 925 };
 926 
 927 static int __init sa1100_serial_init(void)
 928 {
 929         int ret;
 930 
 931         printk(KERN_INFO "Serial: SA11x0 driver\n");
 932 
 933         sa1100_init_ports();
 934 
 935         ret = uart_register_driver(&sa1100_reg);
 936         if (ret == 0) {
 937                 ret = platform_driver_register(&sa11x0_serial_driver);
 938                 if (ret)
 939                         uart_unregister_driver(&sa1100_reg);
 940         }
 941         return ret;
 942 }
 943 
 944 static void __exit sa1100_serial_exit(void)
 945 {
 946         platform_driver_unregister(&sa11x0_serial_driver);
 947         uart_unregister_driver(&sa1100_reg);
 948 }
 949 
 950 module_init(sa1100_serial_init);
 951 module_exit(sa1100_serial_exit);
 952 
 953 MODULE_AUTHOR("Deep Blue Solutions Ltd");
 954 MODULE_DESCRIPTION("SA1100 generic serial port driver");
 955 MODULE_LICENSE("GPL");
 956 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
 957 MODULE_ALIAS("platform:sa11x0-uart");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/tty/serial/sa1100.c

DEFINITIONS
