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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / drivers / macintosh / macserial.c
bloba3a5372f7aeb3723123a37d4eaf75d440b318b0a
1 /*
2 * macserial.c: Serial port driver for Power Macintoshes.
3 *
4 * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
5 *
6 * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 *
9 * Receive DMA code by Takashi Oe <toe@unlserve.unl.edu>.
10 *
11 * $Id: macserial.c,v 1.24.2.4 1999/10/19 04:36:42 paulus Exp $
12 */
13
14 #include <linux/config.h>
15 #include <linux/errno.h>
16 #include <linux/module.h>
17 #include <linux/signal.h>
18 #include <linux/sched.h>
19 #include <linux/timer.h>
20 #include <linux/interrupt.h>
21 #include <linux/workqueue.h>
22 #include <linux/tty.h>
23 #include <linux/tty_flip.h>
24 #include <linux/major.h>
25 #include <linux/string.h>
26 #include <linux/fcntl.h>
27 #include <linux/mm.h>
28 #include <linux/kernel.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #ifdef CONFIG_SERIAL_CONSOLE
32 #include <linux/console.h>
33 #endif
34 #include <linux/slab.h>
35
36 #include <asm/sections.h>
37 #include <asm/io.h>
38 #include <asm/pgtable.h>
39 #include <asm/irq.h>
40 #include <asm/prom.h>
41 #include <asm/system.h>
42 #include <asm/segment.h>
43 #include <asm/bitops.h>
44 #include <asm/machdep.h>
45 #include <asm/pmac_feature.h>
46 #include <linux/adb.h>
47 #include <linux/pmu.h>
48 #ifdef CONFIG_KGDB
49 #include <asm/kgdb.h>
50 #endif
51 #include <asm/dbdma.h>
52
53 #include "macserial.h"
54
55 #ifdef CONFIG_PMAC_PBOOK
56 static int serial_notify_sleep(struct pmu_sleep_notifier *self, int when);
57 static struct pmu_sleep_notifier serial_sleep_notifier = {
58 serial_notify_sleep,
59 SLEEP_LEVEL_MISC,
60 };
61 #endif
62
63 #define SUPPORT_SERIAL_DMA
64 #define MACSERIAL_VERSION "2.0"
65
66 /*
67 * It would be nice to dynamically allocate everything that
68 * depends on NUM_SERIAL, so we could support any number of
69 * Z8530s, but for now...
70 */
71 #define NUM_SERIAL 2 /* Max number of ZS chips supported */
72 #define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */
73
74 /* On PowerMacs, the hardware takes care of the SCC recovery time,
75 but we need the eieio to make sure that the accesses occur
76 in the order we want. */
77 #define RECOVERY_DELAY eieio()
78
79 static struct tty_driver *serial_driver;
80
81 struct mac_zschannel zs_channels[NUM_CHANNELS];
82
83 struct mac_serial zs_soft[NUM_CHANNELS];
84 int zs_channels_found;
85 struct mac_serial *zs_chain; /* list of all channels */
86
87 struct tty_struct zs_ttys[NUM_CHANNELS];
88
89 static int is_powerbook;
90
91 #ifdef CONFIG_SERIAL_CONSOLE
92 static struct console sercons;
93 #endif
94
95 #ifdef CONFIG_KGDB
96 struct mac_zschannel *zs_kgdbchan;
97 static unsigned char scc_inittab[] = {
98 9, 0x80, /* reset A side (CHRA) */
99 13, 0, /* set baud rate divisor */
100 12, 1,
101 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */
102 11, 0x50, /* clocks = br gen (RCBR | TCBR) */
103 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
104 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/
105 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/
106 };
107 #endif
108 #define ZS_CLOCK 3686400 /* Z8530 RTxC input clock rate */
109
110 /* serial subtype definitions */
111 #define SERIAL_TYPE_NORMAL 1
112
113 /* number of characters left in xmit buffer before we ask for more */
114 #define WAKEUP_CHARS 256
115
116 /*
117 * Debugging.
118 */
119 #undef SERIAL_DEBUG_INTR
120 #undef SERIAL_DEBUG_OPEN
121 #undef SERIAL_DEBUG_FLOW
122 #undef SERIAL_DEBUG_POWER
123 #undef SERIAL_DEBUG_THROTTLE
124 #undef SERIAL_DEBUG_STOP
125 #undef SERIAL_DEBUG_BAUDS
126
127 #define RS_STROBE_TIME 10
128 #define RS_ISR_PASS_LIMIT 256
129
130 #define _INLINE_ inline
131
132 #ifdef SERIAL_DEBUG_OPEN
133 #define OPNDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
134 #else
135 #define OPNDBG(fmt, arg...) do { } while (0)
136 #endif
137 #ifdef SERIAL_DEBUG_POWER
138 #define PWRDBG(fmt, arg...) printk(KERN_DEBUG fmt , ## arg)
139 #else
140 #define PWRDBG(fmt, arg...) do { } while (0)
141 #endif
142 #ifdef SERIAL_DEBUG_BAUDS
143 #define BAUDBG(fmt, arg...) printk(fmt , ## arg)
144 #else
145 #define BAUDBG(fmt, arg...) do { } while (0)
146 #endif
147
148 static void probe_sccs(void);
149 static void change_speed(struct mac_serial *info, struct termios *old);
150 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
151 static int set_scc_power(struct mac_serial * info, int state);
152 static int setup_scc(struct mac_serial * info);
153 static void dbdma_reset(volatile struct dbdma_regs *dma);
154 static void dbdma_flush(volatile struct dbdma_regs *dma);
155 static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs);
156 static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs);
157 static void dma_init(struct mac_serial * info);
158 static void rxdma_start(struct mac_serial * info, int current);
159 static void rxdma_to_tty(struct mac_serial * info);
160
161 /*
162 * tmp_buf is used as a temporary buffer by serial_write. We need to
163 * lock it in case the copy_from_user blocks while swapping in a page,
164 * and some other program tries to do a serial write at the same time.
165 * Since the lock will only come under contention when the system is
166 * swapping and available memory is low, it makes sense to share one
167 * buffer across all the serial ports, since it significantly saves
168 * memory if large numbers of serial ports are open.
169 */
170 static unsigned char *tmp_buf;
171 static DECLARE_MUTEX(tmp_buf_sem);
172
173
174 static inline int __pmac
175 serial_paranoia_check(struct mac_serial *info,
176 char *name, const char *routine)
177 {
178 #ifdef SERIAL_PARANOIA_CHECK
179 static const char badmagic[] = KERN_WARNING
180 "Warning: bad magic number for serial struct %s in %s\n";
181 static const char badinfo[] = KERN_WARNING
182 "Warning: null mac_serial for %s in %s\n";
183
184 if (!info) {
185 printk(badinfo, name, routine);
186 return 1;
187 }
188 if (info->magic != SERIAL_MAGIC) {
189 printk(badmagic, name, routine);
190 return 1;
191 }
192 #endif
193 return 0;
194 }
195
196 /*
197 * Reading and writing Z8530 registers.
198 */
199 static inline unsigned char __pmac read_zsreg(struct mac_zschannel *channel,
200 unsigned char reg)
201 {
202 unsigned char retval;
203 unsigned long flags;
204
205 /*
206 * We have to make this atomic.
207 */
208 spin_lock_irqsave(&channel->lock, flags);
209 if (reg != 0) {
210 *channel->control = reg;
211 RECOVERY_DELAY;
212 }
213 retval = *channel->control;
214 RECOVERY_DELAY;
215 spin_unlock_irqrestore(&channel->lock, flags);
216 return retval;
217 }
218
219 static inline void __pmac write_zsreg(struct mac_zschannel *channel,
220 unsigned char reg, unsigned char value)
221 {
222 unsigned long flags;
223
224 spin_lock_irqsave(&channel->lock, flags);
225 if (reg != 0) {
226 *channel->control = reg;
227 RECOVERY_DELAY;
228 }
229 *channel->control = value;
230 RECOVERY_DELAY;
231 spin_unlock_irqrestore(&channel->lock, flags);
232 return;
233 }
234
235 static inline unsigned char __pmac read_zsdata(struct mac_zschannel *channel)
236 {
237 unsigned char retval;
238
239 retval = *channel->data;
240 RECOVERY_DELAY;
241 return retval;
242 }
243
244 static inline void write_zsdata(struct mac_zschannel *channel,
245 unsigned char value)
246 {
247 *channel->data = value;
248 RECOVERY_DELAY;
249 return;
250 }
251
252 static inline void load_zsregs(struct mac_zschannel *channel,
253 unsigned char *regs)
254 {
255 ZS_CLEARERR(channel);
256 ZS_CLEARFIFO(channel);
257 /* Load 'em up */
258 write_zsreg(channel, R4, regs[R4]);
259 write_zsreg(channel, R10, regs[R10]);
260 write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
261 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
262 write_zsreg(channel, R1, regs[R1]);
263 write_zsreg(channel, R9, regs[R9]);
264 write_zsreg(channel, R11, regs[R11]);
265 write_zsreg(channel, R12, regs[R12]);
266 write_zsreg(channel, R13, regs[R13]);
267 write_zsreg(channel, R14, regs[R14]);
268 write_zsreg(channel, R15, regs[R15]);
269 write_zsreg(channel, R3, regs[R3]);
270 write_zsreg(channel, R5, regs[R5]);
271 return;
272 }
273
274 /* Sets or clears DTR/RTS on the requested line */
275 static inline void zs_rtsdtr(struct mac_serial *ss, int set)
276 {
277 if (set)
278 ss->curregs[5] |= (RTS | DTR);
279 else
280 ss->curregs[5] &= ~(RTS | DTR);
281 write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
282 return;
283 }
284
285 /* Utility routines for the Zilog */
286 static inline int get_zsbaud(struct mac_serial *ss)
287 {
288 struct mac_zschannel *channel = ss->zs_channel;
289 int brg;
290
291 if ((ss->curregs[R11] & TCBR) == 0) {
292 /* higher rates don't use the baud rate generator */
293 return (ss->curregs[R4] & X32CLK)? ZS_CLOCK/32: ZS_CLOCK/16;
294 }
295 /* The baud rate is split up between two 8-bit registers in
296 * what is termed 'BRG time constant' format in my docs for
297 * the chip, it is a function of the clk rate the chip is
298 * receiving which happens to be constant.
299 */
300 brg = (read_zsreg(channel, 13) << 8);
301 brg |= read_zsreg(channel, 12);
302 return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
303 }
304
305 /* On receive, this clears errors and the receiver interrupts */
306 static inline void rs_recv_clear(struct mac_zschannel *zsc)
307 {
308 write_zsreg(zsc, 0, ERR_RES);
309 write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
310 }
311
312 /*
313 * Reset a Descriptor-Based DMA channel.
314 */
315 static void dbdma_reset(volatile struct dbdma_regs *dma)
316 {
317 int i;
318
319 out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
320
321 /*
322 * Yes this looks peculiar, but apparently it needs to be this
323 * way on some machines. (We need to make sure the DBDMA
324 * engine has actually got the write above and responded
325 * to it. - paulus)
326 */
327 for (i = 200; i > 0; --i)
328 if (ld_le32(&dma->status) & RUN)
329 udelay(1);
330 }
331
332 /*
333 * Tells a DBDMA channel to stop and write any buffered data
334 * it might have to memory.
335 */
336 static _INLINE_ void dbdma_flush(volatile struct dbdma_regs *dma)
337 {
338 int i = 0;
339
340 out_le32(&dma->control, (FLUSH << 16) | FLUSH);
341 while (((in_le32(&dma->status) & FLUSH) != 0) && (i++ < 100))
342 udelay(1);
343 }
344
345 /*
346 * ----------------------------------------------------------------------
347 *
348 * Here starts the interrupt handling routines. All of the following
349 * subroutines are declared as inline and are folded into
350 * rs_interrupt(). They were separated out for readability's sake.
351 *
352 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
353 * -----------------------------------------------------------------------
354 */
355
356 /*
357 * This routine is used by the interrupt handler to schedule
358 * processing in the software interrupt portion of the driver.
359 */
360 static _INLINE_ void rs_sched_event(struct mac_serial *info,
361 int event)
362 {
363 info->event |= 1 << event;
364 schedule_work(&info->tqueue);
365 }
366
367 /* Work out the flag value for a z8530 status value. */
368 static _INLINE_ int stat_to_flag(int stat)
369 {
370 int flag;
371
372 if (stat & Rx_OVR) {
373 flag = TTY_OVERRUN;
374 } else if (stat & FRM_ERR) {
375 flag = TTY_FRAME;
376 } else if (stat & PAR_ERR) {
377 flag = TTY_PARITY;
378 } else
379 flag = 0;
380 return flag;
381 }
382
383 static _INLINE_ void receive_chars(struct mac_serial *info,
384 struct pt_regs *regs)
385 {
386 struct tty_struct *tty = info->tty;
387 unsigned char ch, stat, flag;
388
389 while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) != 0) {
390
391 stat = read_zsreg(info->zs_channel, R1);
392 ch = read_zsdata(info->zs_channel);
393
394 #ifdef CONFIG_KGDB
395 if (info->kgdb_channel) {
396 if (ch == 0x03 || ch == '$')
397 breakpoint();
398 if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
399 write_zsreg(info->zs_channel, 0, ERR_RES);
400 return;
401 }
402 #endif
403 if (!tty)
404 continue;
405 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
406 tty_flip_buffer_push(tty);
407
408 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
409 static int flip_buf_ovf;
410 if (++flip_buf_ovf <= 1)
411 printk(KERN_WARNING "FB. overflow: %d\n",
412 flip_buf_ovf);
413 break;
414 }
415 tty->flip.count++;
416 {
417 static int flip_max_cnt;
418 if (flip_max_cnt < tty->flip.count)
419 flip_max_cnt = tty->flip.count;
420 }
421 flag = stat_to_flag(stat);
422 if (flag)
423 /* reset the error indication */
424 write_zsreg(info->zs_channel, 0, ERR_RES);
425 *tty->flip.flag_buf_ptr++ = flag;
426 *tty->flip.char_buf_ptr++ = ch;
427 }
428 if (tty)
429 tty_flip_buffer_push(tty);
430 }
431
432 static void transmit_chars(struct mac_serial *info)
433 {
434 if ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0)
435 return;
436 info->tx_active = 0;
437
438 if (info->x_char && !info->power_wait) {
439 /* Send next char */
440 write_zsdata(info->zs_channel, info->x_char);
441 info->x_char = 0;
442 info->tx_active = 1;
443 return;
444 }
445
446 if ((info->xmit_cnt <= 0) || info->tty->stopped || info->tx_stopped
447 || info->power_wait) {
448 write_zsreg(info->zs_channel, 0, RES_Tx_P);
449 return;
450 }
451
452 /* Send char */
453 write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
454 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
455 info->xmit_cnt--;
456 info->tx_active = 1;
457
458 if (info->xmit_cnt < WAKEUP_CHARS)
459 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
460 }
461
462 static void powerup_done(unsigned long data)
463 {
464 struct mac_serial *info = (struct mac_serial *) data;
465 unsigned long flags;
466
467 spin_lock_irqsave(&info->lock, flags);
468 info->power_wait = 0;
469 transmit_chars(info);
470 spin_unlock_irqrestore(&info->lock, flags);
471 }
472
473 static _INLINE_ void status_handle(struct mac_serial *info)
474 {
475 unsigned char status;
476
477 /* Get status from Read Register 0 */
478 status = read_zsreg(info->zs_channel, 0);
479
480 /* Check for DCD transitions */
481 if (((status ^ info->read_reg_zero) & DCD) != 0
482 && info->tty && !C_CLOCAL(info->tty)) {
483 if (status & DCD) {
484 wake_up_interruptible(&info->open_wait);
485 } else {
486 if (info->tty)
487 tty_hangup(info->tty);
488 }
489 }
490
491 /* Check for CTS transitions */
492 if (info->tty && C_CRTSCTS(info->tty)) {
493 /*
494 * For some reason, on the Power Macintosh,
495 * it seems that the CTS bit is 1 when CTS is
496 * *negated* and 0 when it is asserted.
497 * The DCD bit doesn't seem to be inverted
498 * like this.
499 */
500 if ((status & CTS) == 0) {
501 if (info->tx_stopped) {
502 #ifdef SERIAL_DEBUG_FLOW
503 printk(KERN_DEBUG "CTS up\n");
504 #endif
505 info->tx_stopped = 0;
506 if (!info->tx_active)
507 transmit_chars(info);
508 }
509 } else {
510 #ifdef SERIAL_DEBUG_FLOW
511 printk(KERN_DEBUG "CTS down\n");
512 #endif
513 info->tx_stopped = 1;
514 }
515 }
516
517 /* Clear status condition... */
518 write_zsreg(info->zs_channel, 0, RES_EXT_INT);
519 info->read_reg_zero = status;
520 }
521
522 static _INLINE_ void receive_special_dma(struct mac_serial *info)
523 {
524 unsigned char stat, flag;
525 volatile struct dbdma_regs *rd = &info->rx->dma;
526 int where = RX_BUF_SIZE;
527
528 spin_lock(&info->rx_dma_lock);
529 if ((ld_le32(&rd->status) & ACTIVE) != 0)
530 dbdma_flush(rd);
531 if (in_le32(&rd->cmdptr)
532 == virt_to_bus(info->rx_cmds[info->rx_cbuf] + 1))
533 where -= in_le16(&info->rx->res_count);
534 where--;
535
536 stat = read_zsreg(info->zs_channel, R1);
537
538 flag = stat_to_flag(stat);
539 if (flag) {
540 info->rx_flag_buf[info->rx_cbuf][where] = flag;
541 /* reset the error indication */
542 write_zsreg(info->zs_channel, 0, ERR_RES);
543 }
544
545 spin_unlock(&info->rx_dma_lock);
546 }
547
548 /*
549 * This is the serial driver's generic interrupt routine
550 */
551 static irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
552 {
553 struct mac_serial *info = (struct mac_serial *) dev_id;
554 unsigned char zs_intreg;
555 int shift;
556 unsigned long flags;
557 int handled = 0;
558
559 if (!(info->flags & ZILOG_INITIALIZED)) {
560 printk(KERN_WARNING "rs_interrupt: irq %d, port not "
561 "initialized\n", irq);
562 disable_irq(irq);
563 return IRQ_NONE;
564 }
565
566 /* NOTE: The read register 3, which holds the irq status,
567 * does so for both channels on each chip. Although
568 * the status value itself must be read from the A
569 * channel and is only valid when read from channel A.
570 * Yes... broken hardware...
571 */
572 #define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
573
574 if (info->zs_chan_a == info->zs_channel)
575 shift = 3; /* Channel A */
576 else
577 shift = 0; /* Channel B */
578
579 spin_lock_irqsave(&info->lock, flags);
580 for (;;) {
581 zs_intreg = read_zsreg(info->zs_chan_a, 3) >> shift;
582 #ifdef SERIAL_DEBUG_INTR
583 printk(KERN_DEBUG "rs_interrupt: irq %d, zs_intreg 0x%x\n",
584 irq, (int)zs_intreg);
585 #endif
586
587 if ((zs_intreg & CHAN_IRQMASK) == 0)
588 break;
589 handled = 1;
590
591 if (zs_intreg & CHBRxIP) {
592 /* If we are doing DMA, we only ask for interrupts
593 on characters with errors or special conditions. */
594 if (info->dma_initted)
595 receive_special_dma(info);
596 else
597 receive_chars(info, regs);
598 }
599 if (zs_intreg & CHBTxIP)
600 transmit_chars(info);
601 if (zs_intreg & CHBEXT)
602 status_handle(info);
603 }
604 spin_unlock_irqrestore(&info->lock, flags);
605 return IRQ_RETVAL(handled);
606 }
607
608 /* Transmit DMA interrupt - not used at present */
609 static irqreturn_t rs_txdma_irq(int irq, void *dev_id, struct pt_regs *regs)
610 {
611 return IRQ_HANDLED;
612 }
613
614 /*
615 * Receive DMA interrupt.
616 */
617 static irqreturn_t rs_rxdma_irq(int irq, void *dev_id, struct pt_regs *regs)
618 {
619 struct mac_serial *info = (struct mac_serial *) dev_id;
620 volatile struct dbdma_cmd *cd;
621
622 if (!info->dma_initted)
623 return IRQ_NONE;
624 spin_lock(&info->rx_dma_lock);
625 /* First, confirm that this interrupt is, indeed, coming */
626 /* from Rx DMA */
627 cd = info->rx_cmds[info->rx_cbuf] + 2;
628 if ((in_le16(&cd->xfer_status) & (RUN | ACTIVE)) != (RUN | ACTIVE)) {
629 spin_unlock(&info->rx_dma_lock);
630 return IRQ_NONE;
631 }
632 if (info->rx_fbuf != RX_NO_FBUF) {
633 info->rx_cbuf = info->rx_fbuf;
634 if (++info->rx_fbuf == info->rx_nbuf)
635 info->rx_fbuf = 0;
636 if (info->rx_fbuf == info->rx_ubuf)
637 info->rx_fbuf = RX_NO_FBUF;
638 }
639 spin_unlock(&info->rx_dma_lock);
640 return IRQ_HANDLED;
641 }
642
643 /*
644 * -------------------------------------------------------------------
645 * Here ends the serial interrupt routines.
646 * -------------------------------------------------------------------
647 */
648
649 /*
650 * ------------------------------------------------------------
651 * rs_stop() and rs_start()
652 *
653 * This routines are called before setting or resetting tty->stopped.
654 * ------------------------------------------------------------
655 */
656 static void rs_stop(struct tty_struct *tty)
657 {
658 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
659
660 #ifdef SERIAL_DEBUG_STOP
661 printk(KERN_DEBUG "rs_stop %ld....\n",
662 tty->ldisc.chars_in_buffer(tty));
663 #endif
664
665 if (serial_paranoia_check(info, tty->name, "rs_stop"))
666 return;
667
668 #if 0
669 spin_lock_irqsave(&info->lock, flags);
670 if (info->curregs[5] & TxENAB) {
671 info->curregs[5] &= ~TxENAB;
672 info->pendregs[5] &= ~TxENAB;
673 write_zsreg(info->zs_channel, 5, info->curregs[5]);
674 }
675 spin_unlock_irqrestore(&info->lock, flags);
676 #endif
677 }
678
679 static void rs_start(struct tty_struct *tty)
680 {
681 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
682 unsigned long flags;
683
684 #ifdef SERIAL_DEBUG_STOP
685 printk(KERN_DEBUG "rs_start %ld....\n",
686 tty->ldisc.chars_in_buffer(tty));
687 #endif
688
689 if (serial_paranoia_check(info, tty->name, "rs_start"))
690 return;
691
692 spin_lock_irqsave(&info->lock, flags);
693 #if 0
694 if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
695 info->curregs[5] |= TxENAB;
696 info->pendregs[5] = info->curregs[5];
697 write_zsreg(info->zs_channel, 5, info->curregs[5]);
698 }
699 #else
700 if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
701 transmit_chars(info);
702 }
703 #endif
704 spin_unlock_irqrestore(&info->lock, flags);
705 }
706
707 static void do_softint(void *private_)
708 {
709 struct mac_serial *info = (struct mac_serial *) private_;
710 struct tty_struct *tty;
711
712 tty = info->tty;
713 if (!tty)
714 return;
715
716 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
717 tty_wakeup(tty);
718 }
719
720 static int startup(struct mac_serial * info)
721 {
722 int delay;
723
724 OPNDBG("startup() (ttyS%d, irq %d)\n", info->line, info->irq);
725
726 if (info->flags & ZILOG_INITIALIZED) {
727 OPNDBG(" -> already inited\n");
728 return 0;
729 }
730
731 if (!info->xmit_buf) {
732 info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
733 if (!info->xmit_buf)
734 return -ENOMEM;
735 }
736
737 OPNDBG("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
738
739 delay = set_scc_power(info, 1);
740
741 setup_scc(info);
742
743 if (delay) {
744 unsigned long flags;
745
746 /* delay is in ms */
747 spin_lock_irqsave(&info->lock, flags);
748 info->power_wait = 1;
749 mod_timer(&info->powerup_timer,
750 jiffies + (delay * HZ + 999) / 1000);
751 spin_unlock_irqrestore(&info->lock, flags);
752 }
753
754 OPNDBG("enabling IRQ on ttyS%d (irq %d)...\n", info->line, info->irq);
755
756 info->flags |= ZILOG_INITIALIZED;
757 enable_irq(info->irq);
758 if (info->dma_initted) {
759 enable_irq(info->rx_dma_irq);
760 }
761
762 return 0;
763 }
764
765 static _INLINE_ void rxdma_start(struct mac_serial * info, int current)
766 {
767 volatile struct dbdma_regs *rd = &info->rx->dma;
768 volatile struct dbdma_cmd *cd = info->rx_cmds[current];
769
770 //printk(KERN_DEBUG "SCC: rxdma_start\n");
771
772 st_le32(&rd->cmdptr, virt_to_bus(cd));
773 out_le32(&rd->control, (RUN << 16) | RUN);
774 }
775
776 static void rxdma_to_tty(struct mac_serial *info)
777 {
778 struct tty_struct *tty = info->tty;
779 volatile struct dbdma_regs *rd = &info->rx->dma;
780 unsigned long flags;
781 int residue, available, space, do_queue;
782
783 if (!tty)
784 return;
785
786 do_queue = 0;
787 spin_lock_irqsave(&info->rx_dma_lock, flags);
788 more:
789 space = TTY_FLIPBUF_SIZE - tty->flip.count;
790 if (!space) {
791 do_queue++;
792 goto out;
793 }
794 residue = 0;
795 if (info->rx_ubuf == info->rx_cbuf) {
796 if ((ld_le32(&rd->status) & ACTIVE) != 0) {
797 dbdma_flush(rd);
798 if (in_le32(&rd->cmdptr)
799 == virt_to_bus(info->rx_cmds[info->rx_cbuf]+1))
800 residue = in_le16(&info->rx->res_count);
801 }
802 }
803 available = RX_BUF_SIZE - residue - info->rx_done_bytes;
804 if (available > space)
805 available = space;
806 if (available) {
807 memcpy(tty->flip.char_buf_ptr,
808 info->rx_char_buf[info->rx_ubuf] + info->rx_done_bytes,
809 available);
810 memcpy(tty->flip.flag_buf_ptr,
811 info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
812 available);
813 tty->flip.char_buf_ptr += available;
814 tty->flip.count += available;
815 tty->flip.flag_buf_ptr += available;
816 memset(info->rx_flag_buf[info->rx_ubuf] + info->rx_done_bytes,
817 0, available);
818 info->rx_done_bytes += available;
819 do_queue++;
820 }
821 if (info->rx_done_bytes == RX_BUF_SIZE) {
822 volatile struct dbdma_cmd *cd = info->rx_cmds[info->rx_ubuf];
823
824 if (info->rx_ubuf == info->rx_cbuf)
825 goto out;
826 /* mark rx_char_buf[rx_ubuf] free */
827 st_le16(&cd->command, DBDMA_NOP);
828 cd++;
829 st_le32(&cd->cmd_dep, 0);
830 st_le32((unsigned int *)&cd->res_count, 0);
831 cd++;
832 st_le16(&cd->xfer_status, 0);
833
834 if (info->rx_fbuf == RX_NO_FBUF) {
835 info->rx_fbuf = info->rx_ubuf;
836 if (!(ld_le32(&rd->status) & ACTIVE)) {
837 dbdma_reset(&info->rx->dma);
838 rxdma_start(info, info->rx_ubuf);
839 info->rx_cbuf = info->rx_ubuf;
840 }
841 }
842 info->rx_done_bytes = 0;
843 if (++info->rx_ubuf == info->rx_nbuf)
844 info->rx_ubuf = 0;
845 if (info->rx_fbuf == info->rx_ubuf)
846 info->rx_fbuf = RX_NO_FBUF;
847 goto more;
848 }
849 out:
850 spin_unlock_irqrestore(&info->rx_dma_lock, flags);
851 if (do_queue)
852 tty_flip_buffer_push(tty);
853 }
854
855 static void poll_rxdma(unsigned long private_)
856 {
857 struct mac_serial *info = (struct mac_serial *) private_;
858 unsigned long flags;
859
860 rxdma_to_tty(info);
861 spin_lock_irqsave(&info->rx_dma_lock, flags);
862 mod_timer(&info->poll_dma_timer, RX_DMA_TIMER);
863 spin_unlock_irqrestore(&info->rx_dma_lock, flags);
864 }
865
866 static void dma_init(struct mac_serial * info)
867 {
868 int i, size;
869 volatile struct dbdma_cmd *cd;
870 unsigned char *p;
871
872 info->rx_nbuf = 8;
873
874 /* various mem set up */
875 size = sizeof(struct dbdma_cmd) * (3 * info->rx_nbuf + 2)
876 + (RX_BUF_SIZE * 2 + sizeof(*info->rx_cmds)
877 + sizeof(*info->rx_char_buf) + sizeof(*info->rx_flag_buf))
878 * info->rx_nbuf;
879 info->dma_priv = kmalloc(size, GFP_KERNEL | GFP_DMA);
880 if (info->dma_priv == NULL)
881 return;
882 memset(info->dma_priv, 0, size);
883
884 info->rx_cmds = (volatile struct dbdma_cmd **)info->dma_priv;
885 info->rx_char_buf = (unsigned char **) (info->rx_cmds + info->rx_nbuf);
886 info->rx_flag_buf = info->rx_char_buf + info->rx_nbuf;
887 p = (unsigned char *) (info->rx_flag_buf + info->rx_nbuf);
888 for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
889 info->rx_char_buf[i] = p;
890 for (i = 0; i < info->rx_nbuf; i++, p += RX_BUF_SIZE)
891 info->rx_flag_buf[i] = p;
892
893 /* a bit of DMA programming */
894 cd = info->rx_cmds[0] = (volatile struct dbdma_cmd *) DBDMA_ALIGN(p);
895 st_le16(&cd->command, DBDMA_NOP);
896 cd++;
897 st_le16(&cd->req_count, RX_BUF_SIZE);
898 st_le16(&cd->command, INPUT_MORE);
899 st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[0]));
900 cd++;
901 st_le16(&cd->req_count, 4);
902 st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
903 st_le32(&cd->phy_addr, virt_to_bus(cd-2));
904 st_le32(&cd->cmd_dep, DBDMA_STOP);
905 for (i = 1; i < info->rx_nbuf; i++) {
906 info->rx_cmds[i] = ++cd;
907 st_le16(&cd->command, DBDMA_NOP);
908 cd++;
909 st_le16(&cd->req_count, RX_BUF_SIZE);
910 st_le16(&cd->command, INPUT_MORE);
911 st_le32(&cd->phy_addr, virt_to_bus(info->rx_char_buf[i]));
912 cd++;
913 st_le16(&cd->req_count, 4);
914 st_le16(&cd->command, STORE_WORD | INTR_ALWAYS);
915 st_le32(&cd->phy_addr, virt_to_bus(cd-2));
916 st_le32(&cd->cmd_dep, DBDMA_STOP);
917 }
918 cd++;
919 st_le16(&cd->command, DBDMA_NOP | BR_ALWAYS);
920 st_le32(&cd->cmd_dep, virt_to_bus(info->rx_cmds[0]));
921
922 /* setup DMA to our liking */
923 dbdma_reset(&info->rx->dma);
924 st_le32(&info->rx->dma.intr_sel, 0x10001);
925 st_le32(&info->rx->dma.br_sel, 0x10001);
926 out_le32(&info->rx->dma.wait_sel, 0x10001);
927
928 /* set various flags */
929 info->rx_ubuf = 0;
930 info->rx_cbuf = 0;
931 info->rx_fbuf = info->rx_ubuf + 1;
932 if (info->rx_fbuf == info->rx_nbuf)
933 info->rx_fbuf = RX_NO_FBUF;
934 info->rx_done_bytes = 0;
935
936 /* setup polling */
937 init_timer(&info->poll_dma_timer);
938 info->poll_dma_timer.function = (void *)&poll_rxdma;
939 info->poll_dma_timer.data = (unsigned long)info;
940
941 info->dma_initted = 1;
942 }
943
944 /*
945 * FixZeroBug....Works around a bug in the SCC receving channel.
946 * Taken from Darwin code, 15 Sept. 2000 -DanM
947 *
948 * The following sequence prevents a problem that is seen with O'Hare ASICs
949 * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
950 * at the input to the receiver becomes 'stuck' and locks up the receiver.
951 * This problem can occur as a result of a zero bit at the receiver input
952 * coincident with any of the following events:
953 *
954 * The SCC is initialized (hardware or software).
955 * A framing error is detected.
956 * The clocking option changes from synchronous or X1 asynchronous
957 * clocking to X16, X32, or X64 asynchronous clocking.
958 * The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
959 *
960 * This workaround attempts to recover from the lockup condition by placing
961 * the SCC in synchronous loopback mode with a fast clock before programming
962 * any of the asynchronous modes.
963 */
964 static void fix_zero_bug_scc(struct mac_serial * info)
965 {
966 write_zsreg(info->zs_channel, 9,
967 (info->zs_channel == info->zs_chan_a? CHRA: CHRB));
968 udelay(10);
969 write_zsreg(info->zs_channel, 9,
970 ((info->zs_channel == info->zs_chan_a? CHRA: CHRB) | NV));
971
972 write_zsreg(info->zs_channel, 4, (X1CLK | EXTSYNC));
973
974 /* I think this is wrong....but, I just copying code....
975 */
976 write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
977
978 write_zsreg(info->zs_channel, 5, (8 & ~TxENAB));
979 write_zsreg(info->zs_channel, 9, NV); /* Didn't we already do this? */
980 write_zsreg(info->zs_channel, 11, (RCBR | TCBR));
981 write_zsreg(info->zs_channel, 12, 0);
982 write_zsreg(info->zs_channel, 13, 0);
983 write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR));
984 write_zsreg(info->zs_channel, 14, (LOOPBAK | SSBR | BRENABL));
985 write_zsreg(info->zs_channel, 3, (8 | RxENABLE));
986 write_zsreg(info->zs_channel, 0, RES_EXT_INT);
987 write_zsreg(info->zs_channel, 0, RES_EXT_INT); /* to kill some time */
988
989 /* The channel should be OK now, but it is probably receiving
990 * loopback garbage.
991 * Switch to asynchronous mode, disable the receiver,
992 * and discard everything in the receive buffer.
993 */
994 write_zsreg(info->zs_channel, 9, NV);
995 write_zsreg(info->zs_channel, 4, PAR_ENA);
996 write_zsreg(info->zs_channel, 3, (8 & ~RxENABLE));
997
998 while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV) {
999 (void)read_zsreg(info->zs_channel, 8);
1000 write_zsreg(info->zs_channel, 0, RES_EXT_INT);
1001 write_zsreg(info->zs_channel, 0, ERR_RES);
1002 }
1003 }
1004
1005 static int setup_scc(struct mac_serial * info)
1006 {
1007 unsigned long flags;
1008
1009 OPNDBG("setting up ttyS%d SCC...\n", info->line);
1010
1011 spin_lock_irqsave(&info->lock, flags);
1012
1013 /* Nice buggy HW ... */
1014 fix_zero_bug_scc(info);
1015
1016 /*
1017 * Reset the chip.
1018 */
1019 write_zsreg(info->zs_channel, 9,
1020 (info->zs_channel == info->zs_chan_a? CHRA: CHRB));
1021 udelay(10);
1022 write_zsreg(info->zs_channel, 9, 0);
1023
1024 /*
1025 * Clear the receive FIFO.
1026 */
1027 ZS_CLEARFIFO(info->zs_channel);
1028 info->xmit_fifo_size = 1;
1029
1030 /*
1031 * Reset DMAs
1032 */
1033 if (info->has_dma)
1034 dma_init(info);
1035
1036 /*
1037 * Clear the interrupt registers.
1038 */
1039 write_zsreg(info->zs_channel, 0, ERR_RES);
1040 write_zsreg(info->zs_channel, 0, RES_H_IUS);
1041
1042 /*
1043 * Turn on RTS and DTR.
1044 */
1045 if (!info->is_irda)
1046 zs_rtsdtr(info, 1);
1047
1048 /*
1049 * Finally, enable sequencing and interrupts
1050 */
1051 if (!info->dma_initted) {
1052 /* interrupt on ext/status changes, all received chars,
1053 transmit ready */
1054 info->curregs[1] = (info->curregs[1] & ~0x18)
1055 | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
1056 } else {
1057 /* interrupt on ext/status changes, W/Req pin is
1058 receive DMA request */
1059 info->curregs[1] = (info->curregs[1] & ~(0x18 | TxINT_ENAB))
1060 | (EXT_INT_ENAB | WT_RDY_RT | WT_FN_RDYFN);
1061 write_zsreg(info->zs_channel, 1, info->curregs[1]);
1062 /* enable W/Req pin */
1063 info->curregs[1] |= WT_RDY_ENAB;
1064 write_zsreg(info->zs_channel, 1, info->curregs[1]);
1065 /* enable interrupts on transmit ready and receive errors */
1066 info->curregs[1] |= INT_ERR_Rx | TxINT_ENAB;
1067 }
1068 info->pendregs[1] = info->curregs[1];
1069 info->curregs[3] |= (RxENABLE | Rx8);
1070 info->pendregs[3] = info->curregs[3];
1071 info->curregs[5] |= (TxENAB | Tx8);
1072 info->pendregs[5] = info->curregs[5];
1073 info->curregs[9] |= (NV | MIE);
1074 info->pendregs[9] = info->curregs[9];
1075 write_zsreg(info->zs_channel, 3, info->curregs[3]);
1076 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1077 write_zsreg(info->zs_channel, 9, info->curregs[9]);
1078
1079 if (info->tty)
1080 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1081 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1082
1083 spin_unlock_irqrestore(&info->lock, flags);
1084
1085 /*
1086 * Set the speed of the serial port
1087 */
1088 change_speed(info, 0);
1089
1090 /* Save the current value of RR0 */
1091 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
1092
1093 if (info->dma_initted) {
1094 spin_lock_irqsave(&info->rx_dma_lock, flags);
1095 rxdma_start(info, 0);
1096 info->poll_dma_timer.expires = RX_DMA_TIMER;
1097 add_timer(&info->poll_dma_timer);
1098 spin_unlock_irqrestore(&info->rx_dma_lock, flags);
1099 }
1100
1101 return 0;
1102 }
1103
1104 /*
1105 * This routine will shutdown a serial port; interrupts are disabled, and
1106 * DTR is dropped if the hangup on close termio flag is on.
1107 */
1108 static void shutdown(struct mac_serial * info)
1109 {
1110 OPNDBG("Shutting down serial port %d (irq %d)....\n", info->line,
1111 info->irq);
1112
1113 if (!(info->flags & ZILOG_INITIALIZED)) {
1114 OPNDBG("(already shutdown)\n");
1115 return;
1116 }
1117
1118 if (info->has_dma) {
1119 del_timer(&info->poll_dma_timer);
1120 dbdma_reset(info->tx_dma);
1121 dbdma_reset(&info->rx->dma);
1122 disable_irq(info->tx_dma_irq);
1123 disable_irq(info->rx_dma_irq);
1124 }
1125 disable_irq(info->irq);
1126
1127 info->pendregs[1] = info->curregs[1] = 0;
1128 write_zsreg(info->zs_channel, 1, 0); /* no interrupts */
1129
1130 info->curregs[3] &= ~RxENABLE;
1131 info->pendregs[3] = info->curregs[3];
1132 write_zsreg(info->zs_channel, 3, info->curregs[3]);
1133
1134 info->curregs[5] &= ~TxENAB;
1135 if (!info->tty || C_HUPCL(info->tty))
1136 info->curregs[5] &= ~DTR;
1137 info->pendregs[5] = info->curregs[5];
1138 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1139
1140 if (info->tty)
1141 set_bit(TTY_IO_ERROR, &info->tty->flags);
1142
1143 set_scc_power(info, 0);
1144
1145 if (info->xmit_buf) {
1146 free_page((unsigned long) info->xmit_buf);
1147 info->xmit_buf = 0;
1148 }
1149
1150 if (info->has_dma && info->dma_priv) {
1151 kfree(info->dma_priv);
1152 info->dma_priv = NULL;
1153 info->dma_initted = 0;
1154 }
1155
1156 memset(info->curregs, 0, sizeof(info->curregs));
1157 memset(info->pendregs, 0, sizeof(info->pendregs));
1158
1159 info->flags &= ~ZILOG_INITIALIZED;
1160 }
1161
1162 /*
1163 * Turn power on or off to the SCC and associated stuff
1164 * (port drivers, modem, IR port, etc.)
1165 * Returns the number of milliseconds we should wait before
1166 * trying to use the port.
1167 */
1168 static int set_scc_power(struct mac_serial * info, int state)
1169 {
1170 int delay = 0;
1171
1172 if (state) {
1173 PWRDBG("ttyS%d: powering up hardware\n", info->line);
1174 pmac_call_feature(
1175 PMAC_FTR_SCC_ENABLE,
1176 info->dev_node, info->port_type, 1);
1177 if (info->is_internal_modem) {
1178 pmac_call_feature(
1179 PMAC_FTR_MODEM_ENABLE,
1180 info->dev_node, 0, 1);
1181 delay = 2500; /* wait for 2.5s before using */
1182 } else if (info->is_irda)
1183 mdelay(50); /* Do better here once the problems
1184 * with blocking have been ironed out
1185 */
1186 } else {
1187 /* TODO: Make that depend on a timer, don't power down
1188 * immediately
1189 */
1190 PWRDBG("ttyS%d: shutting down hardware\n", info->line);
1191 if (info->is_internal_modem) {
1192 PWRDBG("ttyS%d: shutting down modem\n", info->line);
1193 pmac_call_feature(
1194 PMAC_FTR_MODEM_ENABLE,
1195 info->dev_node, 0, 0);
1196 }
1197 pmac_call_feature(
1198 PMAC_FTR_SCC_ENABLE,
1199 info->dev_node, info->port_type, 0);
1200 }
1201 return delay;
1202 }
1203
1204 static void irda_rts_pulses(struct mac_serial *info, int w)
1205 {
1206 udelay(w);
1207 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB);
1208 udelay(2);
1209 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
1210 udelay(8);
1211 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB);
1212 udelay(4);
1213 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
1214 }
1215
1216 /*
1217 * Set the irda codec on the imac to the specified baud rate.
1218 */
1219 static void irda_setup(struct mac_serial *info)
1220 {
1221 int code, speed, t;
1222
1223 speed = info->tty->termios->c_cflag & CBAUD;
1224 if (speed < B2400 || speed > B115200)
1225 return;
1226 code = 0x4d + B115200 - speed;
1227
1228 /* disable serial interrupts and receive DMA */
1229 write_zsreg(info->zs_channel, 1, info->curregs[1] & ~0x9f);
1230
1231 /* wait for transmitter to drain */
1232 t = 10000;
1233 while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0
1234 || (read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
1235 if (--t <= 0) {
1236 printk(KERN_ERR "transmitter didn't drain\n");
1237 return;
1238 }
1239 udelay(10);
1240 }
1241 udelay(100);
1242
1243 /* set to 8 bits, no parity, 19200 baud, RTS on, DTR off */
1244 write_zsreg(info->zs_channel, 4, X16CLK | SB1);
1245 write_zsreg(info->zs_channel, 11, TCBR | RCBR);
1246 t = BPS_TO_BRG(19200, ZS_CLOCK/16);
1247 write_zsreg(info->zs_channel, 12, t);
1248 write_zsreg(info->zs_channel, 13, t >> 8);
1249 write_zsreg(info->zs_channel, 14, BRENABL);
1250 write_zsreg(info->zs_channel, 3, Rx8 | RxENABLE);
1251 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
1252
1253 /* set TxD low for ~104us and pulse RTS */
1254 udelay(1000);
1255 write_zsdata(info->zs_channel, 0xfe);
1256 irda_rts_pulses(info, 150);
1257 irda_rts_pulses(info, 180);
1258 irda_rts_pulses(info, 50);
1259 udelay(100);
1260
1261 /* assert DTR, wait 30ms, talk to the chip */
1262 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS | DTR);
1263 mdelay(30);
1264 while (read_zsreg(info->zs_channel, 0) & Rx_CH_AV)
1265 read_zsdata(info->zs_channel);
1266
1267 write_zsdata(info->zs_channel, 1);
1268 t = 1000;
1269 while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) {
1270 if (--t <= 0) {
1271 printk(KERN_ERR "irda_setup timed out on 1st byte\n");
1272 goto out;
1273 }
1274 udelay(10);
1275 }
1276 t = read_zsdata(info->zs_channel);
1277 if (t != 4)
1278 printk(KERN_ERR "irda_setup 1st byte = %x\n", t);
1279
1280 write_zsdata(info->zs_channel, code);
1281 t = 1000;
1282 while ((read_zsreg(info->zs_channel, 0) & Rx_CH_AV) == 0) {
1283 if (--t <= 0) {
1284 printk(KERN_ERR "irda_setup timed out on 2nd byte\n");
1285 goto out;
1286 }
1287 udelay(10);
1288 }
1289 t = read_zsdata(info->zs_channel);
1290 if (t != code)
1291 printk(KERN_ERR "irda_setup 2nd byte = %x (%x)\n", t, code);
1292
1293 /* Drop DTR again and do some more RTS pulses */
1294 out:
1295 udelay(100);
1296 write_zsreg(info->zs_channel, 5, Tx8 | TxENAB | RTS);
1297 irda_rts_pulses(info, 80);
1298
1299 /* We should be right to go now. We assume that load_zsregs
1300 will get called soon to load up the correct baud rate etc. */
1301 info->curregs[5] = (info->curregs[5] | RTS) & ~DTR;
1302 info->pendregs[5] = info->curregs[5];
1303 }
1304
1305 /*
1306 * This routine is called to set the UART divisor registers to match
1307 * the specified baud rate for a serial port.
1308 */
1309 static void change_speed(struct mac_serial *info, struct termios *old_termios)
1310 {
1311 unsigned cflag;
1312 int bits;
1313 int brg, baud;
1314 unsigned long flags;
1315
1316 if (!info->tty || !info->tty->termios)
1317 return;
1318
1319 cflag = info->tty->termios->c_cflag;
1320 baud = tty_get_baud_rate(info->tty);
1321 if (baud == 0) {
1322 if (old_termios) {
1323 info->tty->termios->c_cflag &= ~CBAUD;
1324 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
1325 cflag = info->tty->termios->c_cflag;
1326 baud = tty_get_baud_rate(info->tty);
1327 }
1328 else
1329 baud = info->zs_baud;
1330 }
1331 if (baud > 230400)
1332 baud = 230400;
1333 else if (baud == 0)
1334 baud = 38400;
1335
1336 spin_lock_irqsave(&info->lock, flags);
1337 info->zs_baud = baud;
1338 info->clk_divisor = 16;
1339
1340 BAUDBG(KERN_DEBUG "set speed to %d bds, ", baud);
1341
1342 switch (baud) {
1343 case ZS_CLOCK/16: /* 230400 */
1344 info->curregs[4] = X16CLK;
1345 info->curregs[11] = 0;
1346 break;
1347 case ZS_CLOCK/32: /* 115200 */
1348 info->curregs[4] = X32CLK;
1349 info->curregs[11] = 0;
1350 break;
1351 default:
1352 info->curregs[4] = X16CLK;
1353 info->curregs[11] = TCBR | RCBR;
1354 brg = BPS_TO_BRG(baud, ZS_CLOCK/info->clk_divisor);
1355 info->curregs[12] = (brg & 255);
1356 info->curregs[13] = ((brg >> 8) & 255);
1357 info->curregs[14] = BRENABL;
1358 }
1359
1360 /* byte size and parity */
1361 info->curregs[3] &= ~RxNBITS_MASK;
1362 info->curregs[5] &= ~TxNBITS_MASK;
1363 switch (cflag & CSIZE) {
1364 case CS5:
1365 info->curregs[3] |= Rx5;
1366 info->curregs[5] |= Tx5;
1367 BAUDBG("5 bits, ");
1368 bits = 7;
1369 break;
1370 case CS6:
1371 info->curregs[3] |= Rx6;
1372 info->curregs[5] |= Tx6;
1373 BAUDBG("6 bits, ");
1374 bits = 8;
1375 break;
1376 case CS7:
1377 info->curregs[3] |= Rx7;
1378 info->curregs[5] |= Tx7;
1379 BAUDBG("7 bits, ");
1380 bits = 9;
1381 break;
1382 case CS8:
1383 default: /* defaults to 8 bits */
1384 info->curregs[3] |= Rx8;
1385 info->curregs[5] |= Tx8;
1386 BAUDBG("8 bits, ");
1387 bits = 10;
1388 break;
1389 }
1390 info->pendregs[3] = info->curregs[3];
1391 info->pendregs[5] = info->curregs[5];
1392
1393 info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
1394 if (cflag & CSTOPB) {
1395 info->curregs[4] |= SB2;
1396 bits++;
1397 BAUDBG("2 stop, ");
1398 } else {
1399 info->curregs[4] |= SB1;
1400 BAUDBG("1 stop, ");
1401 }
1402 if (cflag & PARENB) {
1403 bits++;
1404 info->curregs[4] |= PAR_ENA;
1405 BAUDBG("parity, ");
1406 }
1407 if (!(cflag & PARODD)) {
1408 info->curregs[4] |= PAR_EVEN;
1409 }
1410 info->pendregs[4] = info->curregs[4];
1411
1412 if (!(cflag & CLOCAL)) {
1413 if (!(info->curregs[15] & DCDIE))
1414 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
1415 info->curregs[15] |= DCDIE;
1416 } else
1417 info->curregs[15] &= ~DCDIE;
1418 if (cflag & CRTSCTS) {
1419 info->curregs[15] |= CTSIE;
1420 if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
1421 info->tx_stopped = 1;
1422 } else {
1423 info->curregs[15] &= ~CTSIE;
1424 info->tx_stopped = 0;
1425 }
1426 info->pendregs[15] = info->curregs[15];
1427
1428 /* Calc timeout value. This is pretty broken with high baud rates with HZ=100.
1429 This code would love a larger HZ and a >1 fifo size, but this is not
1430 a priority. The resulting value must be >HZ/2
1431 */
1432 info->timeout = ((info->xmit_fifo_size*HZ*bits) / baud);
1433 info->timeout += HZ/50+1; /* Add .02 seconds of slop */
1434
1435 BAUDBG("timeout=%d/%ds, base:%d\n", (int)info->timeout, (int)HZ,
1436 (int)info->baud_base);
1437
1438 /* set the irda codec to the right rate */
1439 if (info->is_irda)
1440 irda_setup(info);
1441
1442 /* Load up the new values */
1443 load_zsregs(info->zs_channel, info->curregs);
1444
1445 spin_unlock_irqrestore(&info->lock, flags);
1446 }
1447
1448 static void rs_flush_chars(struct tty_struct *tty)
1449 {
1450 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1451 unsigned long flags;
1452
1453 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1454 return;
1455
1456 spin_lock_irqsave(&info->lock, flags);
1457 if (!(info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped ||
1458 !info->xmit_buf))
1459 /* Enable transmitter */
1460 transmit_chars(info);
1461 spin_unlock_irqrestore(&info->lock, flags);
1462 }
1463
1464 static int rs_write(struct tty_struct * tty, int from_user,
1465 const unsigned char *buf, int count)
1466 {
1467 int c, ret = 0;
1468 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1469 unsigned long flags;
1470
1471 if (serial_paranoia_check(info, tty->name, "rs_write"))
1472 return 0;
1473
1474 if (!tty || !info->xmit_buf || !tmp_buf)
1475 return 0;
1476
1477 if (from_user) {
1478 down(&tmp_buf_sem);
1479 while (1) {
1480 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1481 SERIAL_XMIT_SIZE - info->xmit_head));
1482 if (c <= 0)
1483 break;
1484
1485 c -= copy_from_user(tmp_buf, buf, c);
1486 if (!c) {
1487 if (!ret)
1488 ret = -EFAULT;
1489 break;
1490 }
1491 spin_lock_irqsave(&info->lock, flags);
1492 c = min_t(int, c, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1493 SERIAL_XMIT_SIZE - info->xmit_head));
1494 memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
1495 info->xmit_head = ((info->xmit_head + c) &
1496 (SERIAL_XMIT_SIZE-1));
1497 info->xmit_cnt += c;
1498 spin_unlock_irqrestore(&info->lock, flags);
1499 buf += c;
1500 count -= c;
1501 ret += c;
1502 }
1503 up(&tmp_buf_sem);
1504 } else {
1505 while (1) {
1506 spin_lock_irqsave(&info->lock, flags);
1507 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1508 SERIAL_XMIT_SIZE - info->xmit_head));
1509 if (c <= 0) {
1510 spin_unlock_irqrestore(&info->lock, flags);
1511 break;
1512 }
1513 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1514 info->xmit_head = ((info->xmit_head + c) &
1515 (SERIAL_XMIT_SIZE-1));
1516 info->xmit_cnt += c;
1517 spin_unlock_irqrestore(&info->lock, flags);
1518 buf += c;
1519 count -= c;
1520 ret += c;
1521 }
1522 }
1523 spin_lock_irqsave(&info->lock, flags);
1524 if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
1525 && !info->tx_active)
1526 transmit_chars(info);
1527 spin_unlock_irqrestore(&info->lock, flags);
1528 return ret;
1529 }
1530
1531 static int rs_write_room(struct tty_struct *tty)
1532 {
1533 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1534 int ret;
1535
1536 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1537 return 0;
1538 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1539 if (ret < 0)
1540 ret = 0;
1541 return ret;
1542 }
1543
1544 static int rs_chars_in_buffer(struct tty_struct *tty)
1545 {
1546 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1547
1548 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1549 return 0;
1550 return info->xmit_cnt;
1551 }
1552
1553 static void rs_flush_buffer(struct tty_struct *tty)
1554 {
1555 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1556 unsigned long flags;
1557
1558 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1559 return;
1560 spin_lock_irqsave(&info->lock, flags);
1561 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1562 spin_unlock_irqrestore(&info->lock, flags);
1563 tty_wakeup(tty);
1564 }
1565
1566 /*
1567 * ------------------------------------------------------------
1568 * rs_throttle()
1569 *
1570 * This routine is called by the upper-layer tty layer to signal that
1571 * incoming characters should be throttled.
1572 * ------------------------------------------------------------
1573 */
1574 static void rs_throttle(struct tty_struct * tty)
1575 {
1576 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1577 unsigned long flags;
1578 #ifdef SERIAL_DEBUG_THROTTLE
1579 printk(KERN_DEBUG "throttle %ld....\n",tty->ldisc.chars_in_buffer(tty));
1580 #endif
1581
1582 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1583 return;
1584
1585 if (I_IXOFF(tty)) {
1586 spin_lock_irqsave(&info->lock, flags);
1587 info->x_char = STOP_CHAR(tty);
1588 if (!info->tx_active)
1589 transmit_chars(info);
1590 spin_unlock_irqrestore(&info->lock, flags);
1591 }
1592
1593 if (C_CRTSCTS(tty)) {
1594 /*
1595 * Here we want to turn off the RTS line. On Macintoshes,
1596 * the external serial ports using a DIN-8 or DIN-9
1597 * connector only have the DTR line (which is usually
1598 * wired to both RTS and DTR on an external modem in
1599 * the cable). RTS doesn't go out to the serial port
1600 * socket, it acts as an output enable for the transmit
1601 * data line. So in this case we don't drop RTS.
1602 *
1603 * Macs with internal modems generally do have both RTS
1604 * and DTR wired to the modem, so in that case we do
1605 * drop RTS.
1606 */
1607 if (info->is_internal_modem) {
1608 spin_lock_irqsave(&info->lock, flags);
1609 info->curregs[5] &= ~RTS;
1610 info->pendregs[5] &= ~RTS;
1611 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1612 spin_unlock_irqrestore(&info->lock, flags);
1613 }
1614 }
1615
1616 #ifdef CDTRCTS
1617 if (tty->termios->c_cflag & CDTRCTS) {
1618 spin_lock_irqsave(&info->lock, flags);
1619 info->curregs[5] &= ~DTR;
1620 info->pendregs[5] &= ~DTR;
1621 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1622 spin_unlock_irqrestore(&info->lock, flags);
1623 }
1624 #endif /* CDTRCTS */
1625 }
1626
1627 static void rs_unthrottle(struct tty_struct * tty)
1628 {
1629 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1630 unsigned long flags;
1631 #ifdef SERIAL_DEBUG_THROTTLE
1632 printk(KERN_DEBUG "unthrottle %s: %d....\n",
1633 tty->ldisc.chars_in_buffer(tty));
1634 #endif
1635
1636 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1637 return;
1638
1639 if (I_IXOFF(tty)) {
1640 spin_lock_irqsave(&info->lock, flags);
1641 if (info->x_char)
1642 info->x_char = 0;
1643 else {
1644 info->x_char = START_CHAR(tty);
1645 if (!info->tx_active)
1646 transmit_chars(info);
1647 }
1648 spin_unlock_irqrestore(&info->lock, flags);
1649 }
1650
1651 if (C_CRTSCTS(tty) && info->is_internal_modem) {
1652 /* Assert RTS line */
1653 spin_lock_irqsave(&info->lock, flags);
1654 info->curregs[5] |= RTS;
1655 info->pendregs[5] |= RTS;
1656 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1657 spin_unlock_irqrestore(&info->lock, flags);
1658 }
1659
1660 #ifdef CDTRCTS
1661 if (tty->termios->c_cflag & CDTRCTS) {
1662 /* Assert DTR line */
1663 spin_lock_irqsave(&info->lock, flags);
1664 info->curregs[5] |= DTR;
1665 info->pendregs[5] |= DTR;
1666 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1667 spin_unlock_irqrestore(&info->lock, flags);
1668 }
1669 #endif
1670 }
1671
1672 /*
1673 * ------------------------------------------------------------
1674 * rs_ioctl() and friends
1675 * ------------------------------------------------------------
1676 */
1677
1678 static int get_serial_info(struct mac_serial * info,
1679 struct serial_struct __user * retinfo)
1680 {
1681 struct serial_struct tmp;
1682
1683 if (!retinfo)
1684 return -EFAULT;
1685 memset(&tmp, 0, sizeof(tmp));
1686 tmp.type = info->type;
1687 tmp.line = info->line;
1688 tmp.port = info->port;
1689 tmp.irq = info->irq;
1690 tmp.flags = info->flags;
1691 tmp.baud_base = info->baud_base;
1692 tmp.close_delay = info->close_delay;
1693 tmp.closing_wait = info->closing_wait;
1694 tmp.custom_divisor = info->custom_divisor;
1695 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1696 return -EFAULT;
1697 return 0;
1698 }
1699
1700 static int set_serial_info(struct mac_serial * info,
1701 struct serial_struct __user * new_info)
1702 {
1703 struct serial_struct new_serial;
1704 struct mac_serial old_info;
1705 int retval = 0;
1706
1707 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1708 return -EFAULT;
1709 old_info = *info;
1710
1711 if (!capable(CAP_SYS_ADMIN)) {
1712 if ((new_serial.baud_base != info->baud_base) ||
1713 (new_serial.type != info->type) ||
1714 (new_serial.close_delay != info->close_delay) ||
1715 ((new_serial.flags & ~ZILOG_USR_MASK) !=
1716 (info->flags & ~ZILOG_USR_MASK)))
1717 return -EPERM;
1718 info->flags = ((info->flags & ~ZILOG_USR_MASK) |
1719 (new_serial.flags & ZILOG_USR_MASK));
1720 info->custom_divisor = new_serial.custom_divisor;
1721 goto check_and_exit;
1722 }
1723
1724 if (info->count > 1)
1725 return -EBUSY;
1726
1727 /*
1728 * OK, past this point, all the error checking has been done.
1729 * At this point, we start making changes.....
1730 */
1731
1732 info->baud_base = new_serial.baud_base;
1733 info->flags = ((info->flags & ~ZILOG_FLAGS) |
1734 (new_serial.flags & ZILOG_FLAGS));
1735 info->type = new_serial.type;
1736 info->close_delay = new_serial.close_delay;
1737 info->closing_wait = new_serial.closing_wait;
1738
1739 check_and_exit:
1740 if (info->flags & ZILOG_INITIALIZED)
1741 retval = setup_scc(info);
1742 return retval;
1743 }
1744
1745 /*
1746 * get_lsr_info - get line status register info
1747 *
1748 * Purpose: Let user call ioctl() to get info when the UART physically
1749 * is emptied. On bus types like RS485, the transmitter must
1750 * release the bus after transmitting. This must be done when
1751 * the transmit shift register is empty, not be done when the
1752 * transmit holding register is empty. This functionality
1753 * allows an RS485 driver to be written in user space.
1754 */
1755 static int get_lsr_info(struct mac_serial * info, unsigned int *value)
1756 {
1757 unsigned char status;
1758 unsigned long flags;
1759
1760 spin_lock_irqsave(&info->lock, flags);
1761 status = read_zsreg(info->zs_channel, 0);
1762 spin_unlock_irqrestore(&info->lock, flags);
1763 status = (status & Tx_BUF_EMP)? TIOCSER_TEMT: 0;
1764 return put_user(status,value);
1765 }
1766
1767 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1768 {
1769 struct mac_serial * info = (struct mac_serial *)tty->driver_data;
1770 unsigned char control, status;
1771 unsigned long flags;
1772
1773 #ifdef CONFIG_KGDB
1774 if (info->kgdb_channel)
1775 return -ENODEV;
1776 #endif
1777 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1778 return -ENODEV;
1779
1780 if (tty->flags & (1 << TTY_IO_ERROR))
1781 return -EIO;
1782
1783 spin_lock_irqsave(&info->lock, flags);
1784 control = info->curregs[5];
1785 status = read_zsreg(info->zs_channel, 0);
1786 spin_unlock_irqrestore(&info->lock, flags);
1787 return ((control & RTS) ? TIOCM_RTS: 0)
1788 | ((control & DTR) ? TIOCM_DTR: 0)
1789 | ((status & DCD) ? TIOCM_CAR: 0)
1790 | ((status & CTS) ? 0: TIOCM_CTS);
1791 }
1792
1793 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1794 unsigned int set, unsigned int clear)
1795 {
1796 struct mac_serial * info = (struct mac_serial *)tty->driver_data;
1797 unsigned int arg, bits;
1798 unsigned long flags;
1799
1800 #ifdef CONFIG_KGDB
1801 if (info->kgdb_channel)
1802 return -ENODEV;
1803 #endif
1804 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1805 return -ENODEV;
1806
1807 if (tty->flags & (1 << TTY_IO_ERROR))
1808 return -EIO;
1809
1810 spin_lock_irqsave(&info->lock, flags);
1811 if (set & TIOCM_RTS)
1812 info->curregs[5] |= RTS;
1813 if (set & TIOCM_DTR)
1814 info->curregs[5] |= DTR;
1815 if (clear & TIOCM_RTS)
1816 info->curregs[5] &= ~RTS;
1817 if (clear & TIOCM_DTR)
1818 info->curregs[5] &= ~DTR;
1819
1820 info->pendregs[5] = info->curregs[5];
1821 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1822 spin_unlock_irqrestore(&info->lock, flags);
1823 return 0;
1824 }
1825
1826 /*
1827 * rs_break - turn transmit break condition on/off
1828 */
1829 static void rs_break(struct tty_struct *tty, int break_state)
1830 {
1831 struct mac_serial *info = (struct mac_serial *) tty->driver_data;
1832 unsigned long flags;
1833
1834 if (serial_paranoia_check(info, tty->name, "rs_break"))
1835 return;
1836
1837 spin_lock_irqsave(&info->lock, flags);
1838 if (break_state == -1)
1839 info->curregs[5] |= SND_BRK;
1840 else
1841 info->curregs[5] &= ~SND_BRK;
1842 write_zsreg(info->zs_channel, 5, info->curregs[5]);
1843 spin_unlock_irqrestore(&info->lock, flags);
1844 }
1845
1846 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1847 unsigned int cmd, unsigned long arg)
1848 {
1849 struct mac_serial * info = (struct mac_serial *)tty->driver_data;
1850
1851 #ifdef CONFIG_KGDB
1852 if (info->kgdb_channel)
1853 return -ENODEV;
1854 #endif
1855 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1856 return -ENODEV;
1857
1858 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1859 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT)) {
1860 if (tty->flags & (1 << TTY_IO_ERROR))
1861 return -EIO;
1862 }
1863
1864 switch (cmd) {
1865 case TIOCGSERIAL:
1866 return get_serial_info(info,
1867 (struct serial_struct __user *) arg);
1868 case TIOCSSERIAL:
1869 return set_serial_info(info,
1870 (struct serial_struct __user *) arg);
1871 case TIOCSERGETLSR: /* Get line status register */
1872 return get_lsr_info(info, (unsigned int *) arg);
1873
1874 case TIOCSERGSTRUCT:
1875 if (copy_to_user((struct mac_serial __user *) arg,
1876 info, sizeof(struct mac_serial)))
1877 return -EFAULT;
1878 return 0;
1879
1880 default:
1881 return -ENOIOCTLCMD;
1882 }
1883 return 0;
1884 }
1885
1886 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1887 {
1888 struct mac_serial *info = (struct mac_serial *)tty->driver_data;
1889 int was_stopped;
1890
1891 if (tty->termios->c_cflag == old_termios->c_cflag)
1892 return;
1893 was_stopped = info->tx_stopped;
1894
1895 change_speed(info, old_termios);
1896
1897 if (was_stopped && !info->tx_stopped) {
1898 tty->hw_stopped = 0;
1899 rs_start(tty);
1900 }
1901 }
1902
1903 /*
1904 * ------------------------------------------------------------
1905 * rs_close()
1906 *
1907 * This routine is called when the serial port gets closed.
1908 * Wait for the last remaining data to be sent.
1909 * ------------------------------------------------------------
1910 */
1911 static void rs_close(struct tty_struct *tty, struct file * filp)
1912 {
1913 struct mac_serial * info = (struct mac_serial *)tty->driver_data;
1914 unsigned long flags;
1915
1916 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1917 return;
1918
1919 spin_lock_irqsave(&info->lock, flags);
1920
1921 if (tty_hung_up_p(filp)) {
1922 spin_unlock_irqrestore(&info->lock, flags);
1923 return;
1924 }
1925
1926 OPNDBG("rs_close ttyS%d, count = %d\n", info->line, info->count);
1927 if ((tty->count == 1) && (info->count != 1)) {
1928 /*
1929 * Uh, oh. tty->count is 1, which means that the tty
1930 * structure will be freed. Info->count should always
1931 * be one in these conditions. If it's greater than
1932 * one, we've got real problems, since it means the
1933 * serial port won't be shutdown.
1934 */
1935 printk(KERN_ERR "rs_close: bad serial port count; tty->count "
1936 "is 1, info->count is %d\n", info->count);
1937 info->count = 1;
1938 }
1939 if (--info->count < 0) {
1940 printk(KERN_ERR "rs_close: bad serial port count for "
1941 "ttyS%d: %d\n", info->line, info->count);
1942 info->count = 0;
1943 }
1944 if (info->count) {
1945 spin_unlock_irqrestore(&info->lock, flags);
1946 return;
1947 }
1948 info->flags |= ZILOG_CLOSING;
1949 /*
1950 * Now we wait for the transmit buffer to clear; and we notify
1951 * the line discipline to only process XON/XOFF characters.
1952 */
1953 OPNDBG("waiting end of Tx... (timeout:%d)\n", info->closing_wait);
1954 tty->closing = 1;
1955 if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE) {
1956 spin_unlock_irqrestore(&info->lock, flags);
1957 tty_wait_until_sent(tty, info->closing_wait);
1958 spin_lock_irqsave(&info->lock, flags);
1959 }
1960
1961 /*
1962 * At this point we stop accepting input. To do this, we
1963 * disable the receiver and receive interrupts.
1964 */
1965 info->curregs[3] &= ~RxENABLE;
1966 info->pendregs[3] = info->curregs[3];
1967 write_zsreg(info->zs_channel, 3, info->curregs[3]);
1968 info->curregs[1] &= ~(0x18); /* disable any rx ints */
1969 info->pendregs[1] = info->curregs[1];
1970 write_zsreg(info->zs_channel, 1, info->curregs[1]);
1971 ZS_CLEARFIFO(info->zs_channel);
1972 if (info->flags & ZILOG_INITIALIZED) {
1973 /*
1974 * Before we drop DTR, make sure the SCC transmitter
1975 * has completely drained.
1976 */
1977 OPNDBG("waiting end of Rx...\n");
1978 spin_unlock_irqrestore(&info->lock, flags);
1979 rs_wait_until_sent(tty, info->timeout);
1980 spin_lock_irqsave(&info->lock, flags);
1981 }
1982
1983 shutdown(info);
1984 /* restore flags now since shutdown() will have disabled this port's
1985 specific irqs */
1986 spin_unlock_irqrestore(&info->lock, flags);
1987
1988 if (tty->driver->flush_buffer)
1989 tty->driver->flush_buffer(tty);
1990 tty_ldisc_flush(tty);
1991 tty->closing = 0;
1992 info->event = 0;
1993 info->tty = 0;
1994
1995 if (info->blocked_open) {
1996 if (info->close_delay) {
1997 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1998 }
1999 wake_up_interruptible(&info->open_wait);
2000 }
2001 info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING);
2002 wake_up_interruptible(&info->close_wait);
2003 }
2004
2005 /*
2006 * rs_wait_until_sent() --- wait until the transmitter is empty
2007 */
2008 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2009 {
2010 struct mac_serial *info = (struct mac_serial *) tty->driver_data;
2011 unsigned long orig_jiffies, char_time;
2012
2013 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2014 return;
2015
2016 /* printk("rs_wait_until_sent, timeout:%d, tty_stopped:%d, tx_stopped:%d\n",
2017 timeout, tty->stopped, info->tx_stopped);
2018 */
2019 orig_jiffies = jiffies;
2020 /*
2021 * Set the check interval to be 1/5 of the estimated time to
2022 * send a single character, and make it at least 1. The check
2023 * interval should also be less than the timeout.
2024 */
2025 if (info->timeout <= HZ/50) {
2026 printk(KERN_INFO "macserial: invalid info->timeout=%d\n",
2027 info->timeout);
2028 info->timeout = HZ/50+1;
2029 }
2030
2031 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
2032 char_time = char_time / 5;
2033 if (char_time > HZ) {
2034 printk(KERN_WARNING "macserial: char_time %ld >HZ !!!\n",
2035 char_time);
2036 char_time = 1;
2037 } else if (char_time == 0)
2038 char_time = 1;
2039 if (timeout)
2040 char_time = min_t(unsigned long, char_time, timeout);
2041 while ((read_zsreg(info->zs_channel, 1) & ALL_SNT) == 0) {
2042 msleep_interruptible(jiffies_to_msecs(char_time));
2043 if (signal_pending(current))
2044 break;
2045 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2046 break;
2047 }
2048 current->state = TASK_RUNNING;
2049 }
2050
2051 /*
2052 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
2053 */
2054 static void rs_hangup(struct tty_struct *tty)
2055 {
2056 struct mac_serial * info = (struct mac_serial *)tty->driver_data;
2057
2058 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
2059 return;
2060
2061 rs_flush_buffer(tty);
2062 shutdown(info);
2063 info->event = 0;
2064 info->count = 0;
2065 info->flags &= ~ZILOG_NORMAL_ACTIVE;
2066 info->tty = 0;
2067 wake_up_interruptible(&info->open_wait);
2068 }
2069
2070 /*
2071 * ------------------------------------------------------------
2072 * rs_open() and friends
2073 * ------------------------------------------------------------
2074 */
2075 static int block_til_ready(struct tty_struct *tty, struct file * filp,
2076 struct mac_serial *info)
2077 {
2078 DECLARE_WAITQUEUE(wait,current);
2079 int retval;
2080 int do_clocal = 0;
2081
2082 /*
2083 * If the device is in the middle of being closed, then block
2084 * until it's done, and then try again.
2085 */
2086 if (info->flags & ZILOG_CLOSING) {
2087 interruptible_sleep_on(&info->close_wait);
2088 return -EAGAIN;
2089 }
2090
2091 /*
2092 * If non-blocking mode is set, or the port is not enabled,
2093 * then make the check up front and then exit.
2094 */
2095 if ((filp->f_flags & O_NONBLOCK) ||
2096 (tty->flags & (1 << TTY_IO_ERROR))) {
2097 info->flags |= ZILOG_NORMAL_ACTIVE;
2098 return 0;
2099 }
2100
2101 if (tty->termios->c_cflag & CLOCAL)
2102 do_clocal = 1;
2103
2104 /*
2105 * Block waiting for the carrier detect and the line to become
2106 * free (i.e., not in use by the callout). While we are in
2107 * this loop, info->count is dropped by one, so that
2108 * rs_close() knows when to free things. We restore it upon
2109 * exit, either normal or abnormal.
2110 */
2111 retval = 0;
2112 add_wait_queue(&info->open_wait, &wait);
2113 OPNDBG("block_til_ready before block: ttyS%d, count = %d\n",
2114 info->line, info->count);
2115 spin_lock_irq(&info->lock);
2116 if (!tty_hung_up_p(filp))
2117 info->count--;
2118 spin_unlock_irq(&info->lock);
2119 info->blocked_open++;
2120 while (1) {
2121 spin_lock_irq(&info->lock);
2122 if ((tty->termios->c_cflag & CBAUD) &&
2123 !info->is_irda)
2124 zs_rtsdtr(info, 1);
2125 spin_unlock_irq(&info->lock);
2126 set_current_state(TASK_INTERRUPTIBLE);
2127 if (tty_hung_up_p(filp) ||
2128 !(info->flags & ZILOG_INITIALIZED)) {
2129 retval = -EAGAIN;
2130 break;
2131 }
2132 if (!(info->flags & ZILOG_CLOSING) &&
2133 (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD)))
2134 break;
2135 if (signal_pending(current)) {
2136 retval = -ERESTARTSYS;
2137 break;
2138 }
2139 OPNDBG("block_til_ready blocking: ttyS%d, count = %d\n",
2140 info->line, info->count);
2141 schedule();
2142 }
2143 current->state = TASK_RUNNING;
2144 remove_wait_queue(&info->open_wait, &wait);
2145 if (!tty_hung_up_p(filp))
2146 info->count++;
2147 info->blocked_open--;
2148 OPNDBG("block_til_ready after blocking: ttyS%d, count = %d\n",
2149 info->line, info->count);
2150 if (retval)
2151 return retval;
2152 info->flags |= ZILOG_NORMAL_ACTIVE;
2153 return 0;
2154 }
2155
2156 /*
2157 * This routine is called whenever a serial port is opened. It
2158 * enables interrupts for a serial port, linking in its ZILOG structure into
2159 * the IRQ chain. It also performs the serial-specific
2160 * initialization for the tty structure.
2161 */
2162 static int rs_open(struct tty_struct *tty, struct file * filp)
2163 {
2164 struct mac_serial *info;
2165 int retval, line;
2166 unsigned long page;
2167
2168 line = tty->index;
2169 if ((line < 0) || (line >= zs_channels_found)) {
2170 return -ENODEV;
2171 }
2172 info = zs_soft + line;
2173
2174 #ifdef CONFIG_KGDB
2175 if (info->kgdb_channel) {
2176 return -ENODEV;
2177 }
2178 #endif
2179 if (serial_paranoia_check(info, tty->name, "rs_open"))
2180 return -ENODEV;
2181 OPNDBG("rs_open %s, count = %d, tty=%p\n", tty->name,
2182 info->count, tty);
2183
2184 info->count++;
2185 tty->driver_data = info;
2186 info->tty = tty;
2187
2188 if (!tmp_buf) {
2189 page = get_zeroed_page(GFP_KERNEL);
2190 if (!page)
2191 return -ENOMEM;
2192 if (tmp_buf)
2193 free_page(page);
2194 else
2195 tmp_buf = (unsigned char *) page;
2196 }
2197
2198 /*
2199 * If the port is the middle of closing, bail out now
2200 */
2201 if (tty_hung_up_p(filp) ||
2202 (info->flags & ZILOG_CLOSING)) {
2203 if (info->flags & ZILOG_CLOSING)
2204 interruptible_sleep_on(&info->close_wait);
2205 return -EAGAIN;
2206 }
2207
2208 /*
2209 * Start up serial port
2210 */
2211
2212 retval = startup(info);
2213 if (retval)
2214 return retval;
2215
2216 retval = block_til_ready(tty, filp, info);
2217 if (retval) {
2218 OPNDBG("rs_open returning after block_til_ready with %d\n",
2219 retval);
2220 return retval;
2221 }
2222
2223 #ifdef CONFIG_SERIAL_CONSOLE
2224 if (sercons.cflag && sercons.index == line) {
2225 tty->termios->c_cflag = sercons.cflag;
2226 sercons.cflag = 0;
2227 change_speed(info, 0);
2228 }
2229 #endif
2230
2231 OPNDBG("rs_open %s successful...\n", tty->name);
2232 return 0;
2233 }
2234
2235 /* Finally, routines used to initialize the serial driver. */
2236
2237 static void show_serial_version(void)
2238 {
2239 printk(KERN_INFO "PowerMac Z8530 serial driver version " MACSERIAL_VERSION "\n");
2240 }
2241
2242 /*
2243 * Initialize one channel, both the mac_serial and mac_zschannel
2244 * structs. We use the dev_node field of the mac_serial struct.
2245 */
2246 static int
2247 chan_init(struct mac_serial *zss, struct mac_zschannel *zs_chan,
2248 struct mac_zschannel *zs_chan_a)
2249 {
2250 struct device_node *ch = zss->dev_node;
2251 char *conn;
2252 int len;
2253 struct slot_names_prop {
2254 int count;
2255 char name[1];
2256 } *slots;
2257
2258 zss->irq = ch->intrs[0].line;
2259 zss->has_dma = 0;
2260 #if !defined(CONFIG_KGDB) && defined(SUPPORT_SERIAL_DMA)
2261 if (ch->n_addrs >= 3 && ch->n_intrs == 3)
2262 zss->has_dma = 1;
2263 #endif
2264 zss->dma_initted = 0;
2265
2266 zs_chan->control = (volatile unsigned char *)
2267 ioremap(ch->addrs[0].address, 0x1000);
2268 zs_chan->data = zs_chan->control + 0x10;
2269 spin_lock_init(&zs_chan->lock);
2270 zs_chan->parent = zss;
2271 zss->zs_channel = zs_chan;
2272 zss->zs_chan_a = zs_chan_a;
2273
2274 /* setup misc varariables */
2275 zss->kgdb_channel = 0;
2276
2277 /* For now, we assume you either have a slot-names property
2278 * with "Modem" in it, or your channel is compatible with
2279 * "cobalt". Might need additional fixups
2280 */
2281 zss->is_internal_modem = device_is_compatible(ch, "cobalt");
2282 conn = get_property(ch, "AAPL,connector", &len);
2283 zss->is_irda = conn && (strcmp(conn, "infrared") == 0);
2284 zss->port_type = PMAC_SCC_ASYNC;
2285 /* 1999 Powerbook G3 has slot-names property instead */
2286 slots = (struct slot_names_prop *)get_property(ch, "slot-names", &len);
2287 if (slots && slots->count > 0) {
2288 if (strcmp(slots->name, "IrDA") == 0)
2289 zss->is_irda = 1;
2290 else if (strcmp(slots->name, "Modem") == 0)
2291 zss->is_internal_modem = 1;
2292 }
2293 if (zss->is_irda)
2294 zss->port_type = PMAC_SCC_IRDA;
2295 if (zss->is_internal_modem) {
2296 struct device_node* i2c_modem = find_devices("i2c-modem");
2297 if (i2c_modem) {
2298 char* mid = get_property(i2c_modem, "modem-id", NULL);
2299 if (mid) switch(*mid) {
2300 case 0x04 :
2301 case 0x05 :
2302 case 0x07 :
2303 case 0x08 :
2304 case 0x0b :
2305 case 0x0c :
2306 zss->port_type = PMAC_SCC_I2S1;
2307 }
2308 printk(KERN_INFO "macserial: i2c-modem detected, id: %d\n",
2309 mid ? (*mid) : 0);
2310 } else {
2311 printk(KERN_INFO "macserial: serial modem detected\n");
2312 }
2313 }
2314
2315 while (zss->has_dma) {
2316 zss->dma_priv = NULL;
2317 /* it seems that the last two addresses are the
2318 DMA controllers */
2319 zss->tx_dma = (volatile struct dbdma_regs *)
2320 ioremap(ch->addrs[ch->n_addrs - 2].address, 0x100);
2321 zss->rx = (volatile struct mac_dma *)
2322 ioremap(ch->addrs[ch->n_addrs - 1].address, 0x100);
2323 zss->tx_dma_irq = ch->intrs[1].line;
2324 zss->rx_dma_irq = ch->intrs[2].line;
2325 spin_lock_init(&zss->rx_dma_lock);
2326 break;
2327 }
2328
2329 init_timer(&zss->powerup_timer);
2330 zss->powerup_timer.function = powerup_done;
2331 zss->powerup_timer.data = (unsigned long) zss;
2332 return 0;
2333 }
2334
2335 /*
2336 * /proc fs routines. TODO: Add status lines & error stats
2337 */
2338 static inline int
2339 line_info(char *buf, struct mac_serial *info)
2340 {
2341 int ret=0;
2342 unsigned char* connector;
2343 int lenp;
2344
2345 ret += sprintf(buf, "%d: port:0x%X irq:%d", info->line, info->port, info->irq);
2346
2347 connector = get_property(info->dev_node, "AAPL,connector", &lenp);
2348 if (connector)
2349 ret+=sprintf(buf+ret," con:%s ", connector);
2350 if (info->is_internal_modem) {
2351 if (!connector)
2352 ret+=sprintf(buf+ret," con:");
2353 ret+=sprintf(buf+ret,"%s", " (internal modem)");
2354 }
2355 if (info->is_irda) {
2356 if (!connector)
2357 ret+=sprintf(buf+ret," con:");
2358 ret+=sprintf(buf+ret,"%s", " (IrDA)");
2359 }
2360 ret+=sprintf(buf+ret,"\n");
2361
2362 return ret;
2363 }
2364
2365 int macserial_read_proc(char *page, char **start, off_t off, int count,
2366 int *eof, void *data)
2367 {
2368 int l, len = 0;
2369 off_t begin = 0;
2370 struct mac_serial *info;
2371
2372 len += sprintf(page, "serinfo:1.0 driver:" MACSERIAL_VERSION "\n");
2373 for (info = zs_chain; info && len < 4000; info = info->zs_next) {
2374 l = line_info(page + len, info);
2375 len += l;
2376 if (len+begin > off+count)
2377 goto done;
2378 if (len+begin < off) {
2379 begin += len;
2380 len = 0;
2381 }
2382 }
2383 *eof = 1;
2384 done:
2385 if (off >= len+begin)
2386 return 0;
2387 *start = page + (off-begin);
2388 return ((count < begin+len-off) ? count : begin+len-off);
2389 }
2390
2391 /* Ask the PROM how many Z8530s we have and initialize their zs_channels */
2392 static void
2393 probe_sccs(void)
2394 {
2395 struct device_node *dev, *ch;
2396 struct mac_serial **pp;
2397 int n, chip, nchan;
2398 struct mac_zschannel *zs_chan;
2399 int chan_a_index;
2400
2401 n = 0;
2402 pp = &zs_chain;
2403 zs_chan = zs_channels;
2404 for (dev = find_devices("escc"); dev != 0; dev = dev->next) {
2405 nchan = 0;
2406 chip = n;
2407 if (n >= NUM_CHANNELS) {
2408 printk(KERN_WARNING "Sorry, can't use %s: no more "
2409 "channels\n", dev->full_name);
2410 continue;
2411 }
2412 chan_a_index = 0;
2413 for (ch = dev->child; ch != 0; ch = ch->sibling) {
2414 if (nchan >= 2) {
2415 printk(KERN_WARNING "SCC: Only 2 channels per "
2416 "chip are supported\n");
2417 break;
2418 }
2419 if (ch->n_addrs < 1 || (ch ->n_intrs < 1)) {
2420 printk("Can't use %s: %d addrs %d intrs\n",
2421 ch->full_name, ch->n_addrs, ch->n_intrs);
2422 continue;
2423 }
2424
2425 /* The channel with the higher address
2426 will be the A side. */
2427 if (nchan > 0 &&
2428 ch->addrs[0].address
2429 > zs_soft[n-1].dev_node->addrs[0].address)
2430 chan_a_index = 1;
2431
2432 /* minimal initialization for now */
2433 zs_soft[n].dev_node = ch;
2434 *pp = &zs_soft[n];
2435 pp = &zs_soft[n].zs_next;
2436 ++nchan;
2437 ++n;
2438 }
2439 if (nchan == 0)
2440 continue;
2441
2442 /* set up A side */
2443 if (chan_init(&zs_soft[chip + chan_a_index], zs_chan, zs_chan))
2444 continue;
2445 ++zs_chan;
2446
2447 /* set up B side, if it exists */
2448 if (nchan > 1)
2449 if (chan_init(&zs_soft[chip + 1 - chan_a_index],
2450 zs_chan, zs_chan - 1))
2451 continue;
2452 ++zs_chan;
2453 }
2454 *pp = 0;
2455
2456 zs_channels_found = n;
2457 #ifdef CONFIG_PMAC_PBOOK
2458 if (n)
2459 pmu_register_sleep_notifier(&serial_sleep_notifier);
2460 #endif /* CONFIG_PMAC_PBOOK */
2461 }
2462
2463 static struct tty_operations serial_ops = {
2464 .open = rs_open,
2465 .close = rs_close,
2466 .write = rs_write,
2467 .flush_chars = rs_flush_chars,
2468 .write_room = rs_write_room,
2469 .chars_in_buffer = rs_chars_in_buffer,
2470 .flush_buffer = rs_flush_buffer,
2471 .ioctl = rs_ioctl,
2472 .throttle = rs_throttle,
2473 .unthrottle = rs_unthrottle,
2474 .set_termios = rs_set_termios,
2475 .stop = rs_stop,
2476 .start = rs_start,
2477 .hangup = rs_hangup,
2478 .break_ctl = rs_break,
2479 .wait_until_sent = rs_wait_until_sent,
2480 .read_proc = macserial_read_proc,
2481 .tiocmget = rs_tiocmget,
2482 .tiocmset = rs_tiocmset,
2483 };
2484
2485 static int macserial_init(void)
2486 {
2487 int channel, i;
2488 struct mac_serial *info;
2489
2490 /* Find out how many Z8530 SCCs we have */
2491 if (zs_chain == 0)
2492 probe_sccs();
2493
2494 serial_driver = alloc_tty_driver(zs_channels_found);
2495 if (!serial_driver)
2496 return -ENOMEM;
2497
2498 /* XXX assume it's a powerbook if we have a via-pmu
2499 *
2500 * This is OK for core99 machines as well.
2501 */
2502 is_powerbook = find_devices("via-pmu") != 0;
2503
2504 /* Register the interrupt handler for each one
2505 * We also request the OF resources here as probe_sccs()
2506 * might be called too early for that
2507 */
2508 for (i = 0; i < zs_channels_found; ++i) {
2509 struct device_node* ch = zs_soft[i].dev_node;
2510 if (!request_OF_resource(ch, 0, NULL)) {
2511 printk(KERN_ERR "macserial: can't request IO resource !\n");
2512 put_tty_driver(serial_driver);
2513 return -ENODEV;
2514 }
2515 if (zs_soft[i].has_dma) {
2516 if (!request_OF_resource(ch, ch->n_addrs - 2, " (tx dma)")) {
2517 printk(KERN_ERR "macserial: can't request TX DMA resource !\n");
2518 zs_soft[i].has_dma = 0;
2519 goto no_dma;
2520 }
2521 if (!request_OF_resource(ch, ch->n_addrs - 1, " (rx dma)")) {
2522 release_OF_resource(ch, ch->n_addrs - 2);
2523 printk(KERN_ERR "macserial: can't request RX DMA resource !\n");
2524 zs_soft[i].has_dma = 0;
2525 goto no_dma;
2526 }
2527 if (request_irq(zs_soft[i].tx_dma_irq, rs_txdma_irq, 0,
2528 "SCC-txdma", &zs_soft[i]))
2529 printk(KERN_ERR "macserial: can't get irq %d\n",
2530 zs_soft[i].tx_dma_irq);
2531 disable_irq(zs_soft[i].tx_dma_irq);
2532 if (request_irq(zs_soft[i].rx_dma_irq, rs_rxdma_irq, 0,
2533 "SCC-rxdma", &zs_soft[i]))
2534 printk(KERN_ERR "macserial: can't get irq %d\n",
2535 zs_soft[i].rx_dma_irq);
2536 disable_irq(zs_soft[i].rx_dma_irq);
2537 }
2538 no_dma:
2539 if (request_irq(zs_soft[i].irq, rs_interrupt, 0,
2540 "SCC", &zs_soft[i]))
2541 printk(KERN_ERR "macserial: can't get irq %d\n",
2542 zs_soft[i].irq);
2543 disable_irq(zs_soft[i].irq);
2544 }
2545
2546 show_serial_version();
2547
2548 /* Initialize the tty_driver structure */
2549 /* Not all of this is exactly right for us. */
2550
2551 serial_driver->owner = THIS_MODULE;
2552 serial_driver->driver_name = "macserial";
2553 serial_driver->devfs_name = "tts/";
2554 serial_driver->name = "ttyS";
2555 serial_driver->major = TTY_MAJOR;
2556 serial_driver->minor_start = 64;
2557 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2558 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2559 serial_driver->init_termios = tty_std_termios;
2560 serial_driver->init_termios.c_cflag =
2561 B38400 | CS8 | CREAD | HUPCL | CLOCAL;
2562 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2563 tty_set_operations(serial_driver, &serial_ops);
2564
2565 if (tty_register_driver(serial_driver))
2566 printk(KERN_ERR "Error: couldn't register serial driver\n");
2567
2568 for (channel = 0; channel < zs_channels_found; ++channel) {
2569 #ifdef CONFIG_KGDB
2570 if (zs_soft[channel].kgdb_channel) {
2571 kgdb_interruptible(1);
2572 continue;
2573 }
2574 #endif
2575 zs_soft[channel].clk_divisor = 16;
2576 /* -- we are not sure the SCC is powered ON at this point
2577 zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
2578 */
2579 zs_soft[channel].zs_baud = 38400;
2580
2581 /* If console serial line, then enable interrupts. */
2582 if (zs_soft[channel].is_cons) {
2583 printk(KERN_INFO "macserial: console line, enabling "
2584 "interrupt %d\n", zs_soft[channel].irq);
2585 panic("macserial: console not supported yet !");
2586 write_zsreg(zs_soft[channel].zs_channel, R1,
2587 (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB));
2588 write_zsreg(zs_soft[channel].zs_channel, R9,
2589 (NV | MIE));
2590 }
2591 }
2592
2593 for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
2594 {
2595 unsigned char* connector;
2596 int lenp;
2597
2598 #ifdef CONFIG_KGDB
2599 if (info->kgdb_channel) {
2600 continue;
2601 }
2602 #endif
2603 info->magic = SERIAL_MAGIC;
2604 info->port = (int) info->zs_channel->control;
2605 info->line = i;
2606 info->tty = 0;
2607 info->custom_divisor = 16;
2608 info->timeout = 0;
2609 info->close_delay = 50;
2610 info->closing_wait = 3000;
2611 info->x_char = 0;
2612 info->event = 0;
2613 info->count = 0;
2614 info->blocked_open = 0;
2615 INIT_WORK(&info->tqueue, do_softint, info);
2616 spin_lock_init(&info->lock);
2617 init_waitqueue_head(&info->open_wait);
2618 init_waitqueue_head(&info->close_wait);
2619 info->timeout = HZ;
2620 printk(KERN_INFO "tty%02d at 0x%08x (irq = %d)", info->line,
2621 info->port, info->irq);
2622 printk(" is a Z8530 ESCC");
2623 connector = get_property(info->dev_node, "AAPL,connector", &lenp);
2624 if (connector)
2625 printk(", port = %s", connector);
2626 if (info->is_internal_modem)
2627 printk(" (internal modem)");
2628 if (info->is_irda)
2629 printk(" (IrDA)");
2630 printk("\n");
2631 }
2632 tmp_buf = 0;
2633
2634 return 0;
2635 }
2636
2637 void macserial_cleanup(void)
2638 {
2639 int i;
2640 unsigned long flags;
2641 struct mac_serial *info;
2642
2643 for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
2644 set_scc_power(info, 0);
2645 spin_lock_irqsave(&info->lock, flags);
2646 for (i = 0; i < zs_channels_found; ++i) {
2647 free_irq(zs_soft[i].irq, &zs_soft[i]);
2648 if (zs_soft[i].has_dma) {
2649 free_irq(zs_soft[i].tx_dma_irq, &zs_soft[i]);
2650 free_irq(zs_soft[i].rx_dma_irq, &zs_soft[i]);
2651 }
2652 release_OF_resource(zs_soft[i].dev_node, 0);
2653 if (zs_soft[i].has_dma) {
2654 struct device_node* ch = zs_soft[i].dev_node;
2655 release_OF_resource(ch, ch->n_addrs - 2);
2656 release_OF_resource(ch, ch->n_addrs - 1);
2657 }
2658 }
2659 spin_unlock_irqrestore(&info->lock, flags);
2660 tty_unregister_driver(serial_driver);
2661 put_tty_driver(serial_driver);
2662
2663 if (tmp_buf) {
2664 free_page((unsigned long) tmp_buf);
2665 tmp_buf = 0;
2666 }
2667
2668 #ifdef CONFIG_PMAC_PBOOK
2669 if (zs_channels_found)
2670 pmu_unregister_sleep_notifier(&serial_sleep_notifier);
2671 #endif /* CONFIG_PMAC_PBOOK */
2672 }
2673
2674 module_init(macserial_init);
2675 module_exit(macserial_cleanup);
2676 MODULE_LICENSE("GPL");
2677
2678 #if 0
2679 /*
2680 * register_serial and unregister_serial allows for serial ports to be
2681 * configured at run-time, to support PCMCIA modems.
2682 */
2683 /* PowerMac: Unused at this time, just here to make things link. */
2684 int register_serial(struct serial_struct *req)
2685 {
2686 return -1;
2687 }
2688
2689 void unregister_serial(int line)
2690 {
2691 return;
2692 }
2693 #endif
2694
2695 /*
2696 * ------------------------------------------------------------
2697 * Serial console driver
2698 * ------------------------------------------------------------
2699 */
2700 #ifdef CONFIG_SERIAL_CONSOLE
2701
2702 /*
2703 * Print a string to the serial port trying not to disturb
2704 * any possible real use of the port...
2705 */
2706 static void serial_console_write(struct console *co, const char *s,
2707 unsigned count)
2708 {
2709 struct mac_serial *info = zs_soft + co->index;
2710 int i;
2711
2712 /* Turn of interrupts and enable the transmitter. */
2713 write_zsreg(info->zs_channel, R1, info->curregs[1] & ~TxINT_ENAB);
2714 write_zsreg(info->zs_channel, R5, info->curregs[5] | TxENAB | RTS | DTR);
2715
2716 for (i=0; i<count; i++) {
2717 /* Wait for the transmit buffer to empty. */
2718 while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP) == 0) {
2719 eieio();
2720 }
2721
2722 write_zsdata(info->zs_channel, s[i]);
2723 if (s[i] == 10) {
2724 while ((read_zsreg(info->zs_channel, 0) & Tx_BUF_EMP)
2725 == 0)
2726 eieio();
2727
2728 write_zsdata(info->zs_channel, 13);
2729 }
2730 }
2731
2732 /* Restore the values in the registers. */
2733 write_zsreg(info->zs_channel, R1, info->curregs[1]);
2734 /* Don't disable the transmitter. */
2735 }
2736
2737 static struct tty_driver *serial_driver;
2738
2739 static struct tty_driver *serial_console_device(struct console *c, int *index)
2740 {
2741 *index = c->index;
2742 return serial_driver;
2743 }
2744
2745 /*
2746 * Setup initial baud/bits/parity. We do two things here:
2747 * - construct a cflag setting for the first rs_open()
2748 * - initialize the serial port
2749 * Return non-zero if we didn't find a serial port.
2750 */
2751 static int __init serial_console_setup(struct console *co, char *options)
2752 {
2753 struct mac_serial *info;
2754 int baud = 38400;
2755 int bits = 8;
2756 int parity = 'n';
2757 int cflag = CREAD | HUPCL | CLOCAL;
2758 int brg;
2759 char *s;
2760 long flags;
2761
2762 /* Find out how many Z8530 SCCs we have */
2763 if (zs_chain == 0)
2764 probe_sccs();
2765
2766 if (zs_chain == 0)
2767 return -1;
2768
2769 /* Do we have the device asked for? */
2770 if (co->index >= zs_channels_found)
2771 return -1;
2772 info = zs_soft + co->index;
2773
2774 set_scc_power(info, 1);
2775
2776 /* Reset the channel */
2777 write_zsreg(info->zs_channel, R9, CHRA);
2778
2779 if (options) {
2780 baud = simple_strtoul(options, NULL, 10);
2781 s = options;
2782 while(*s >= '0' && *s <= '9')
2783 s++;
2784 if (*s)
2785 parity = *s++;
2786 if (*s)
2787 bits = *s - '0';
2788 }
2789
2790 /*
2791 * Now construct a cflag setting.
2792 */
2793 switch(baud) {
2794 case 1200:
2795 cflag |= B1200;
2796 break;
2797 case 2400:
2798 cflag |= B2400;
2799 break;
2800 case 4800:
2801 cflag |= B4800;
2802 break;
2803 case 9600:
2804 cflag |= B9600;
2805 break;
2806 case 19200:
2807 cflag |= B19200;
2808 break;
2809 case 57600:
2810 cflag |= B57600;
2811 break;
2812 case 115200:
2813 cflag |= B115200;
2814 break;
2815 case 38400:
2816 default:
2817 cflag |= B38400;
2818 break;
2819 }
2820 switch(bits) {
2821 case 7:
2822 cflag |= CS7;
2823 break;
2824 default:
2825 case 8:
2826 cflag |= CS8;
2827 break;
2828 }
2829 switch(parity) {
2830 case 'o': case 'O':
2831 cflag |= PARENB | PARODD;
2832 break;
2833 case 'e': case 'E':
2834 cflag |= PARENB;
2835 break;
2836 }
2837 co->cflag = cflag;
2838
2839 spin_lock_irqsave(&info->lock, flags);
2840 memset(info->curregs, 0, sizeof(info->curregs));
2841
2842 info->zs_baud = baud;
2843 info->clk_divisor = 16;
2844 switch (info->zs_baud) {
2845 case ZS_CLOCK/16: /* 230400 */
2846 info->curregs[4] = X16CLK;
2847 info->curregs[11] = 0;
2848 break;
2849 case ZS_CLOCK/32: /* 115200 */
2850 info->curregs[4] = X32CLK;
2851 info->curregs[11] = 0;
2852 break;
2853 default:
2854 info->curregs[4] = X16CLK;
2855 info->curregs[11] = TCBR | RCBR;
2856 brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
2857 info->curregs[12] = (brg & 255);
2858 info->curregs[13] = ((brg >> 8) & 255);
2859 info->curregs[14] = BRENABL;
2860 }
2861
2862 /* byte size and parity */
2863 info->curregs[3] &= ~RxNBITS_MASK;
2864 info->curregs[5] &= ~TxNBITS_MASK;
2865 switch (cflag & CSIZE) {
2866 case CS5:
2867 info->curregs[3] |= Rx5;
2868 info->curregs[5] |= Tx5;
2869 break;
2870 case CS6:
2871 info->curregs[3] |= Rx6;
2872 info->curregs[5] |= Tx6;
2873 break;
2874 case CS7:
2875 info->curregs[3] |= Rx7;
2876 info->curregs[5] |= Tx7;
2877 break;
2878 case CS8:
2879 default: /* defaults to 8 bits */
2880 info->curregs[3] |= Rx8;
2881 info->curregs[5] |= Tx8;
2882 break;
2883 }
2884 info->curregs[5] |= TxENAB | RTS | DTR;
2885 info->pendregs[3] = info->curregs[3];
2886 info->pendregs[5] = info->curregs[5];
2887
2888 info->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
2889 if (cflag & CSTOPB) {
2890 info->curregs[4] |= SB2;
2891 } else {
2892 info->curregs[4] |= SB1;
2893 }
2894 if (cflag & PARENB) {
2895 info->curregs[4] |= PAR_ENA;
2896 if (!(cflag & PARODD)) {
2897 info->curregs[4] |= PAR_EVEN;
2898 }
2899 }
2900 info->pendregs[4] = info->curregs[4];
2901
2902 if (!(cflag & CLOCAL)) {
2903 if (!(info->curregs[15] & DCDIE))
2904 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
2905 info->curregs[15] |= DCDIE;
2906 } else
2907 info->curregs[15] &= ~DCDIE;
2908 if (cflag & CRTSCTS) {
2909 info->curregs[15] |= CTSIE;
2910 if ((read_zsreg(info->zs_channel, 0) & CTS) != 0)
2911 info->tx_stopped = 1;
2912 } else {
2913 info->curregs[15] &= ~CTSIE;
2914 info->tx_stopped = 0;
2915 }
2916 info->pendregs[15] = info->curregs[15];
2917
2918 /* Load up the new values */
2919 load_zsregs(info->zs_channel, info->curregs);
2920
2921 spin_unlock_irqrestore(&info->lock, flags);
2922
2923 return 0;
2924 }
2925
2926 static struct console sercons = {
2927 .name = "ttyS",
2928 .write = serial_console_write,
2929 .device = serial_console_device,
2930 .setup = serial_console_setup,
2931 .flags = CON_PRINTBUFFER,
2932 .index = -1,
2933 };
2934
2935 /*
2936 * Register console.
2937 */
2938 static void __init mac_scc_console_init(void)
2939 {
2940 register_console(&sercons);
2941 }
2942 console_initcall(mac_scc_console_init);
2943
2944 #endif /* ifdef CONFIG_SERIAL_CONSOLE */
2945
2946 #ifdef CONFIG_KGDB
2947 /* These are for receiving and sending characters under the kgdb
2948 * source level kernel debugger.
2949 */
2950 void putDebugChar(char kgdb_char)
2951 {
2952 struct mac_zschannel *chan = zs_kgdbchan;
2953 while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
2954 udelay(5);
2955 write_zsdata(chan, kgdb_char);
2956 }
2957
2958 char getDebugChar(void)
2959 {
2960 struct mac_zschannel *chan = zs_kgdbchan;
2961 while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
2962 eieio(); /*barrier();*/
2963 return read_zsdata(chan);
2964 }
2965
2966 void kgdb_interruptible(int yes)
2967 {
2968 struct mac_zschannel *chan = zs_kgdbchan;
2969 int one, nine;
2970 nine = read_zsreg(chan, 9);
2971 if (yes == 1) {
2972 one = EXT_INT_ENAB|INT_ALL_Rx;
2973 nine |= MIE;
2974 printk("turning serial ints on\n");
2975 } else {
2976 one = RxINT_DISAB;
2977 nine &= ~MIE;
2978 printk("turning serial ints off\n");
2979 }
2980 write_zsreg(chan, 1, one);
2981 write_zsreg(chan, 9, nine);
2982 }
2983
2984 /* This sets up the serial port we're using, and turns on
2985 * interrupts for that channel, so kgdb is usable once we're done.
2986 */
2987 static inline void kgdb_chaninit(struct mac_zschannel *ms, int intson, int bps)
2988 {
2989 int brg;
2990 int i, x;
2991 volatile char *sccc = ms->control;
2992 brg = BPS_TO_BRG(bps, ZS_CLOCK/16);
2993 printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg);
2994 for (i = 20000; i != 0; --i) {
2995 x = *sccc; eieio();
2996 }
2997 for (i = 0; i < sizeof(scc_inittab); ++i) {
2998 write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]);
2999 i++;
3000 }
3001 }
3002
3003 /* This is called at boot time to prime the kgdb serial debugging
3004 * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1
3005 * for /dev/ttyb which is determined in setup_arch() from the
3006 * boot command line flags.
3007 * XXX at the moment probably only channel A will work
3008 */
3009 void __init zs_kgdb_hook(int tty_num)
3010 {
3011 /* Find out how many Z8530 SCCs we have */
3012 if (zs_chain == 0)
3013 probe_sccs();
3014
3015 set_scc_power(&zs_soft[tty_num], 1);
3016
3017 zs_kgdbchan = zs_soft[tty_num].zs_channel;
3018 zs_soft[tty_num].change_needed = 0;
3019 zs_soft[tty_num].clk_divisor = 16;
3020 zs_soft[tty_num].zs_baud = 38400;
3021 zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */
3022
3023 /* Turn on transmitter/receiver at 8-bits/char */
3024 kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400);
3025 printk("KGDB: on channel %d initialized\n", tty_num);
3026 set_debug_traps(); /* init stub */
3027 }
3028 #endif /* ifdef CONFIG_KGDB */
3029
3030 #ifdef CONFIG_PMAC_PBOOK
3031 /*
3032 * notify clients before sleep and reset bus afterwards
3033 */
3034 int
3035 serial_notify_sleep(struct pmu_sleep_notifier *self, int when)
3036 {
3037 int i;
3038
3039 switch (when) {
3040 case PBOOK_SLEEP_REQUEST:
3041 case PBOOK_SLEEP_REJECT:
3042 break;
3043
3044 case PBOOK_SLEEP_NOW:
3045 for (i=0; i<zs_channels_found; i++) {
3046 struct mac_serial *info = &zs_soft[i];
3047 if (info->flags & ZILOG_INITIALIZED) {
3048 shutdown(info);
3049 info->flags |= ZILOG_SLEEPING;
3050 }
3051 }
3052 break;
3053 case PBOOK_WAKE:
3054 for (i=0; i<zs_channels_found; i++) {
3055 struct mac_serial *info = &zs_soft[i];
3056 if (info->flags & ZILOG_SLEEPING) {
3057 info->flags &= ~ZILOG_SLEEPING;
3058 startup(info);
3059 }
3060 }
3061 break;
3062 }
3063 return PBOOK_SLEEP_OK;
3064 }
3065 #endif /* CONFIG_PMAC_PBOOK */
MOXA 2.6.9 from sdlinux-moxaart.tgz