Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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

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