Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/tty/serial/sa1100.c

  1 /*
  2  *  Driver for SA11x0 serial ports
  3  *
  4  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
  5  *
  6  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  */
 22 
 23 #if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
 24 #define SUPPORT_SYSRQ
 25 #endif
 26 
 27 #include <linux/module.h>
 28 #include <linux/ioport.h>
 29 #include <linux/init.h>
 30 #include <linux/console.h>
 31 #include <linux/sysrq.h>
 32 #include <linux/platform_data/sa11x0-serial.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/tty.h>
 35 #include <linux/tty_flip.h>
 36 #include <linux/serial_core.h>
 37 #include <linux/serial.h>
 38 #include <linux/io.h>
 39 
 40 #include <asm/irq.h>
 41 #include <mach/hardware.h>
 42 #include <mach/irqs.h>
 43 
 44 /* We've been assigned a range on the "Low-density serial ports" major */
 45 #define SERIAL_SA1100_MAJOR     204
 46 #define MINOR_START             5
 47 
 48 #define NR_PORTS                3
 49 
 50 #define SA1100_ISR_PASS_LIMIT   256
 51 
 52 /*
 53  * Convert from ignore_status_mask or read_status_mask to UTSR[01]
 54  */
 55 #define SM_TO_UTSR0(x)  ((x) & 0xff)
 56 #define SM_TO_UTSR1(x)  ((x) >> 8)
 57 #define UTSR0_TO_SM(x)  ((x))
 58 #define UTSR1_TO_SM(x)  ((x) << 8)
 59 
 60 #define UART_GET_UTCR0(sport)   __raw_readl((sport)->port.membase + UTCR0)
 61 #define UART_GET_UTCR1(sport)   __raw_readl((sport)->port.membase + UTCR1)
 62 #define UART_GET_UTCR2(sport)   __raw_readl((sport)->port.membase + UTCR2)
 63 #define UART_GET_UTCR3(sport)   __raw_readl((sport)->port.membase + UTCR3)
 64 #define UART_GET_UTSR0(sport)   __raw_readl((sport)->port.membase + UTSR0)
 65 #define UART_GET_UTSR1(sport)   __raw_readl((sport)->port.membase + UTSR1)
 66 #define UART_GET_CHAR(sport)    __raw_readl((sport)->port.membase + UTDR)
 67 
 68 #define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
 69 #define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
 70 #define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
 71 #define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
 72 #define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
 73 #define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
 74 #define UART_PUT_CHAR(sport,v)  __raw_writel((v),(sport)->port.membase + UTDR)
 75 
 76 /*
 77  * This is the size of our serial port register set.
 78  */
 79 #define UART_PORT_SIZE  0x24
 80 
 81 /*
 82  * This determines how often we check the modem status signals
 83  * for any change.  They generally aren't connected to an IRQ
 84  * so we have to poll them.  We also check immediately before
 85  * filling the TX fifo incase CTS has been dropped.
 86  */
 87 #define MCTRL_TIMEOUT   (250*HZ/1000)
 88 
 89 struct sa1100_port {
 90         struct uart_port        port;
 91         struct timer_list       timer;
 92         unsigned int            old_status;
 93 };
 94 
 95 /*
 96  * Handle any change of modem status signal since we were last called.
 97  */
 98 static void sa1100_mctrl_check(struct sa1100_port *sport)
 99 {
100         unsigned int status, changed;
101 
102         status = sport->port.ops->get_mctrl(&sport->port);
103         changed = status ^ sport->old_status;
104 
105         if (changed == 0)
106                 return;
107 
108         sport->old_status = status;
109 
110         if (changed & TIOCM_RI)
111                 sport->port.icount.rng++;
112         if (changed & TIOCM_DSR)
113                 sport->port.icount.dsr++;
114         if (changed & TIOCM_CAR)
115                 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
116         if (changed & TIOCM_CTS)
117                 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
118 
119         wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
120 }
121 
122 /*
123  * This is our per-port timeout handler, for checking the
124  * modem status signals.
125  */
126 static void sa1100_timeout(unsigned long data)
127 {
128         struct sa1100_port *sport = (struct sa1100_port *)data;
129         unsigned long flags;
130 
131         if (sport->port.state) {
132                 spin_lock_irqsave(&sport->port.lock, flags);
133                 sa1100_mctrl_check(sport);
134                 spin_unlock_irqrestore(&sport->port.lock, flags);
135 
136                 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
137         }
138 }
139 
140 /*
141  * interrupts disabled on entry
142  */
143 static void sa1100_stop_tx(struct uart_port *port)
144 {
145         struct sa1100_port *sport =
146                 container_of(port, struct sa1100_port, port);
147         u32 utcr3;
148 
149         utcr3 = UART_GET_UTCR3(sport);
150         UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
151         sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
152 }
153 
154 /*
155  * port locked and interrupts disabled
156  */
157 static void sa1100_start_tx(struct uart_port *port)
158 {
159         struct sa1100_port *sport =
160                 container_of(port, struct sa1100_port, port);
161         u32 utcr3;
162 
163         utcr3 = UART_GET_UTCR3(sport);
164         sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
165         UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
166 }
167 
168 /*
169  * Interrupts enabled
170  */
171 static void sa1100_stop_rx(struct uart_port *port)
172 {
173         struct sa1100_port *sport =
174                 container_of(port, struct sa1100_port, port);
175         u32 utcr3;
176 
177         utcr3 = UART_GET_UTCR3(sport);
178         UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
179 }
180 
181 /*
182  * Set the modem control timer to fire immediately.
183  */
184 static void sa1100_enable_ms(struct uart_port *port)
185 {
186         struct sa1100_port *sport =
187                 container_of(port, struct sa1100_port, port);
188 
189         mod_timer(&sport->timer, jiffies);
190 }
191 
192 static void
193 sa1100_rx_chars(struct sa1100_port *sport)
194 {
195         unsigned int status, ch, flg;
196 
197         status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
198                  UTSR0_TO_SM(UART_GET_UTSR0(sport));
199         while (status & UTSR1_TO_SM(UTSR1_RNE)) {
200                 ch = UART_GET_CHAR(sport);
201 
202                 sport->port.icount.rx++;
203 
204                 flg = TTY_NORMAL;
205 
206                 /*
207                  * note that the error handling code is
208                  * out of the main execution path
209                  */
210                 if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
211                         if (status & UTSR1_TO_SM(UTSR1_PRE))
212                                 sport->port.icount.parity++;
213                         else if (status & UTSR1_TO_SM(UTSR1_FRE))
214                                 sport->port.icount.frame++;
215                         if (status & UTSR1_TO_SM(UTSR1_ROR))
216                                 sport->port.icount.overrun++;
217 
218                         status &= sport->port.read_status_mask;
219 
220                         if (status & UTSR1_TO_SM(UTSR1_PRE))
221                                 flg = TTY_PARITY;
222                         else if (status & UTSR1_TO_SM(UTSR1_FRE))
223                                 flg = TTY_FRAME;
224 
225 #ifdef SUPPORT_SYSRQ
226                         sport->port.sysrq = 0;
227 #endif
228                 }
229 
230                 if (uart_handle_sysrq_char(&sport->port, ch))
231                         goto ignore_char;
232 
233                 uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
234 
235         ignore_char:
236                 status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
237                          UTSR0_TO_SM(UART_GET_UTSR0(sport));
238         }
239 
240         spin_unlock(&sport->port.lock);
241         tty_flip_buffer_push(&sport->port.state->port);
242         spin_lock(&sport->port.lock);
243 }
244 
245 static void sa1100_tx_chars(struct sa1100_port *sport)
246 {
247         struct circ_buf *xmit = &sport->port.state->xmit;
248 
249         if (sport->port.x_char) {
250                 UART_PUT_CHAR(sport, sport->port.x_char);
251                 sport->port.icount.tx++;
252                 sport->port.x_char = 0;
253                 return;
254         }
255 
256         /*
257          * Check the modem control lines before
258          * transmitting anything.
259          */
260         sa1100_mctrl_check(sport);
261 
262         if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
263                 sa1100_stop_tx(&sport->port);
264                 return;
265         }
266 
267         /*
268          * Tried using FIFO (not checking TNF) for fifo fill:
269          * still had the '4 bytes repeated' problem.
270          */
271         while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
272                 UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
273                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
274                 sport->port.icount.tx++;
275                 if (uart_circ_empty(xmit))
276                         break;
277         }
278 
279         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
280                 uart_write_wakeup(&sport->port);
281 
282         if (uart_circ_empty(xmit))
283                 sa1100_stop_tx(&sport->port);
284 }
285 
286 static irqreturn_t sa1100_int(int irq, void *dev_id)
287 {
288         struct sa1100_port *sport = dev_id;
289         unsigned int status, pass_counter = 0;
290 
291         spin_lock(&sport->port.lock);
292         status = UART_GET_UTSR0(sport);
293         status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
294         do {
295                 if (status & (UTSR0_RFS | UTSR0_RID)) {
296                         /* Clear the receiver idle bit, if set */
297                         if (status & UTSR0_RID)
298                                 UART_PUT_UTSR0(sport, UTSR0_RID);
299                         sa1100_rx_chars(sport);
300                 }
301 
302                 /* Clear the relevant break bits */
303                 if (status & (UTSR0_RBB | UTSR0_REB))
304                         UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
305 
306                 if (status & UTSR0_RBB)
307                         sport->port.icount.brk++;
308 
309                 if (status & UTSR0_REB)
310                         uart_handle_break(&sport->port);
311 
312                 if (status & UTSR0_TFS)
313                         sa1100_tx_chars(sport);
314                 if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
315                         break;
316                 status = UART_GET_UTSR0(sport);
317                 status &= SM_TO_UTSR0(sport->port.read_status_mask) |
318                           ~UTSR0_TFS;
319         } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
320         spin_unlock(&sport->port.lock);
321 
322         return IRQ_HANDLED;
323 }
324 
325 /*
326  * Return TIOCSER_TEMT when transmitter is not busy.
327  */
328 static unsigned int sa1100_tx_empty(struct uart_port *port)
329 {
330         struct sa1100_port *sport =
331                 container_of(port, struct sa1100_port, port);
332 
333         return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
334 }
335 
336 static unsigned int sa1100_get_mctrl(struct uart_port *port)
337 {
338         return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
339 }
340 
341 static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
342 {
343 }
344 
345 /*
346  * Interrupts always disabled.
347  */
348 static void sa1100_break_ctl(struct uart_port *port, int break_state)
349 {
350         struct sa1100_port *sport =
351                 container_of(port, struct sa1100_port, port);
352         unsigned long flags;
353         unsigned int utcr3;
354 
355         spin_lock_irqsave(&sport->port.lock, flags);
356         utcr3 = UART_GET_UTCR3(sport);
357         if (break_state == -1)
358                 utcr3 |= UTCR3_BRK;
359         else
360                 utcr3 &= ~UTCR3_BRK;
361         UART_PUT_UTCR3(sport, utcr3);
362         spin_unlock_irqrestore(&sport->port.lock, flags);
363 }
364 
365 static int sa1100_startup(struct uart_port *port)
366 {
367         struct sa1100_port *sport =
368                 container_of(port, struct sa1100_port, port);
369         int retval;
370 
371         /*
372          * Allocate the IRQ
373          */
374         retval = request_irq(sport->port.irq, sa1100_int, 0,
375                              "sa11x0-uart", sport);
376         if (retval)
377                 return retval;
378 
379         /*
380          * Finally, clear and enable interrupts
381          */
382         UART_PUT_UTSR0(sport, -1);
383         UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
384 
385         /*
386          * Enable modem status interrupts
387          */
388         spin_lock_irq(&sport->port.lock);
389         sa1100_enable_ms(&sport->port);
390         spin_unlock_irq(&sport->port.lock);
391 
392         return 0;
393 }
394 
395 static void sa1100_shutdown(struct uart_port *port)
396 {
397         struct sa1100_port *sport =
398                 container_of(port, struct sa1100_port, port);
399 
400         /*
401          * Stop our timer.
402          */
403         del_timer_sync(&sport->timer);
404 
405         /*
406          * Free the interrupt
407          */
408         free_irq(sport->port.irq, sport);
409 
410         /*
411          * Disable all interrupts, port and break condition.
412          */
413         UART_PUT_UTCR3(sport, 0);
414 }
415 
416 static void
417 sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
418                    struct ktermios *old)
419 {
420         struct sa1100_port *sport =
421                 container_of(port, struct sa1100_port, port);
422         unsigned long flags;
423         unsigned int utcr0, old_utcr3, baud, quot;
424         unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
425 
426         /*
427          * We only support CS7 and CS8.
428          */
429         while ((termios->c_cflag & CSIZE) != CS7 &&
430                (termios->c_cflag & CSIZE) != CS8) {
431                 termios->c_cflag &= ~CSIZE;
432                 termios->c_cflag |= old_csize;
433                 old_csize = CS8;
434         }
435 
436         if ((termios->c_cflag & CSIZE) == CS8)
437                 utcr0 = UTCR0_DSS;
438         else
439                 utcr0 = 0;
440 
441         if (termios->c_cflag & CSTOPB)
442                 utcr0 |= UTCR0_SBS;
443         if (termios->c_cflag & PARENB) {
444                 utcr0 |= UTCR0_PE;
445                 if (!(termios->c_cflag & PARODD))
446                         utcr0 |= UTCR0_OES;
447         }
448 
449         /*
450          * Ask the core to calculate the divisor for us.
451          */
452         baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
453         quot = uart_get_divisor(port, baud);
454 
455         spin_lock_irqsave(&sport->port.lock, flags);
456 
457         sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
458         sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
459         if (termios->c_iflag & INPCK)
460                 sport->port.read_status_mask |=
461                                 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
462         if (termios->c_iflag & (BRKINT | PARMRK))
463                 sport->port.read_status_mask |=
464                                 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
465 
466         /*
467          * Characters to ignore
468          */
469         sport->port.ignore_status_mask = 0;
470         if (termios->c_iflag & IGNPAR)
471                 sport->port.ignore_status_mask |=
472                                 UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
473         if (termios->c_iflag & IGNBRK) {
474                 sport->port.ignore_status_mask |=
475                                 UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
476                 /*
477                  * If we're ignoring parity and break indicators,
478                  * ignore overruns too (for real raw support).
479                  */
480                 if (termios->c_iflag & IGNPAR)
481                         sport->port.ignore_status_mask |=
482                                 UTSR1_TO_SM(UTSR1_ROR);
483         }
484 
485         del_timer_sync(&sport->timer);
486 
487         /*
488          * Update the per-port timeout.
489          */
490         uart_update_timeout(port, termios->c_cflag, baud);
491 
492         /*
493          * disable interrupts and drain transmitter
494          */
495         old_utcr3 = UART_GET_UTCR3(sport);
496         UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
497 
498         while (UART_GET_UTSR1(sport) & UTSR1_TBY)
499                 barrier();
500 
501         /* then, disable everything */
502         UART_PUT_UTCR3(sport, 0);
503 
504         /* set the parity, stop bits and data size */
505         UART_PUT_UTCR0(sport, utcr0);
506 
507         /* set the baud rate */
508         quot -= 1;
509         UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
510         UART_PUT_UTCR2(sport, (quot & 0xff));
511 
512         UART_PUT_UTSR0(sport, -1);
513 
514         UART_PUT_UTCR3(sport, old_utcr3);
515 
516         if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
517                 sa1100_enable_ms(&sport->port);
518 
519         spin_unlock_irqrestore(&sport->port.lock, flags);
520 }
521 
522 static const char *sa1100_type(struct uart_port *port)
523 {
524         struct sa1100_port *sport =
525                 container_of(port, struct sa1100_port, port);
526 
527         return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
528 }
529 
530 /*
531  * Release the memory region(s) being used by 'port'.
532  */
533 static void sa1100_release_port(struct uart_port *port)
534 {
535         struct sa1100_port *sport =
536                 container_of(port, struct sa1100_port, port);
537 
538         release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
539 }
540 
541 /*
542  * Request the memory region(s) being used by 'port'.
543  */
544 static int sa1100_request_port(struct uart_port *port)
545 {
546         struct sa1100_port *sport =
547                 container_of(port, struct sa1100_port, port);
548 
549         return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
550                         "sa11x0-uart") != NULL ? 0 : -EBUSY;
551 }
552 
553 /*
554  * Configure/autoconfigure the port.
555  */
556 static void sa1100_config_port(struct uart_port *port, int flags)
557 {
558         struct sa1100_port *sport =
559                 container_of(port, struct sa1100_port, port);
560 
561         if (flags & UART_CONFIG_TYPE &&
562             sa1100_request_port(&sport->port) == 0)
563                 sport->port.type = PORT_SA1100;
564 }
565 
566 /*
567  * Verify the new serial_struct (for TIOCSSERIAL).
568  * The only change we allow are to the flags and type, and
569  * even then only between PORT_SA1100 and PORT_UNKNOWN
570  */
571 static int
572 sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
573 {
574         struct sa1100_port *sport =
575                 container_of(port, struct sa1100_port, port);
576         int ret = 0;
577 
578         if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
579                 ret = -EINVAL;
580         if (sport->port.irq != ser->irq)
581                 ret = -EINVAL;
582         if (ser->io_type != SERIAL_IO_MEM)
583                 ret = -EINVAL;
584         if (sport->port.uartclk / 16 != ser->baud_base)
585                 ret = -EINVAL;
586         if ((void *)sport->port.mapbase != ser->iomem_base)
587                 ret = -EINVAL;
588         if (sport->port.iobase != ser->port)
589                 ret = -EINVAL;
590         if (ser->hub6 != 0)
591                 ret = -EINVAL;
592         return ret;
593 }
594 
595 static struct uart_ops sa1100_pops = {
596         .tx_empty       = sa1100_tx_empty,
597         .set_mctrl      = sa1100_set_mctrl,
598         .get_mctrl      = sa1100_get_mctrl,
599         .stop_tx        = sa1100_stop_tx,
600         .start_tx       = sa1100_start_tx,
601         .stop_rx        = sa1100_stop_rx,
602         .enable_ms      = sa1100_enable_ms,
603         .break_ctl      = sa1100_break_ctl,
604         .startup        = sa1100_startup,
605         .shutdown       = sa1100_shutdown,
606         .set_termios    = sa1100_set_termios,
607         .type           = sa1100_type,
608         .release_port   = sa1100_release_port,
609         .request_port   = sa1100_request_port,
610         .config_port    = sa1100_config_port,
611         .verify_port    = sa1100_verify_port,
612 };
613 
614 static struct sa1100_port sa1100_ports[NR_PORTS];
615 
616 /*
617  * Setup the SA1100 serial ports.  Note that we don't include the IrDA
618  * port here since we have our own SIR/FIR driver (see drivers/net/irda)
619  *
620  * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
621  * Which serial port this ends up being depends on the machine you're
622  * running this kernel on.  I'm not convinced that this is a good idea,
623  * but that's the way it traditionally works.
624  *
625  * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
626  * used here.
627  */
628 static void __init sa1100_init_ports(void)
629 {
630         static int first = 1;
631         int i;
632 
633         if (!first)
634                 return;
635         first = 0;
636 
637         for (i = 0; i < NR_PORTS; i++) {
638                 sa1100_ports[i].port.uartclk   = 3686400;
639                 sa1100_ports[i].port.ops       = &sa1100_pops;
640                 sa1100_ports[i].port.fifosize  = 8;
641                 sa1100_ports[i].port.line      = i;
642                 sa1100_ports[i].port.iotype    = UPIO_MEM;
643                 init_timer(&sa1100_ports[i].timer);
644                 sa1100_ports[i].timer.function = sa1100_timeout;
645                 sa1100_ports[i].timer.data     = (unsigned long)&sa1100_ports[i];
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_probe(struct platform_device *dev)
861 {
862         struct resource *res = dev->resource;
863         int i;
864 
865         for (i = 0; i < dev->num_resources; i++, res++)
866                 if (res->flags & IORESOURCE_MEM)
867                         break;
868 
869         if (i < dev->num_resources) {
870                 for (i = 0; i < NR_PORTS; i++) {
871                         if (sa1100_ports[i].port.mapbase != res->start)
872                                 continue;
873 
874                         sa1100_ports[i].port.dev = &dev->dev;
875                         uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
876                         platform_set_drvdata(dev, &sa1100_ports[i]);
877                         break;
878                 }
879         }
880 
881         return 0;
882 }
883 
884 static int sa1100_serial_remove(struct platform_device *pdev)
885 {
886         struct sa1100_port *sport = platform_get_drvdata(pdev);
887 
888         if (sport)
889                 uart_remove_one_port(&sa1100_reg, &sport->port);
890 
891         return 0;
892 }
893 
894 static struct platform_driver sa11x0_serial_driver = {
895         .probe          = sa1100_serial_probe,
896         .remove         = sa1100_serial_remove,
897         .suspend        = sa1100_serial_suspend,
898         .resume         = sa1100_serial_resume,
899         .driver         = {
900                 .name   = "sa11x0-uart",
901         },
902 };
903 
904 static int __init sa1100_serial_init(void)
905 {
906         int ret;
907 
908         printk(KERN_INFO "Serial: SA11x0 driver\n");
909 
910         sa1100_init_ports();
911 
912         ret = uart_register_driver(&sa1100_reg);
913         if (ret == 0) {
914                 ret = platform_driver_register(&sa11x0_serial_driver);
915                 if (ret)
916                         uart_unregister_driver(&sa1100_reg);
917         }
918         return ret;
919 }
920 
921 static void __exit sa1100_serial_exit(void)
922 {
923         platform_driver_unregister(&sa11x0_serial_driver);
924         uart_unregister_driver(&sa1100_reg);
925 }
926 
927 module_init(sa1100_serial_init);
928 module_exit(sa1100_serial_exit);
929 
930 MODULE_AUTHOR("Deep Blue Solutions Ltd");
931 MODULE_DESCRIPTION("SA1100 generic serial port driver");
932 MODULE_LICENSE("GPL");
933 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
934 MODULE_ALIAS("platform:sa11x0-uart");
935 

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