Driver core: Remove unneeded get_{device,driver}() calls.
[linux-2.6.git] / drivers / serial / sunzilog.c
1 /* sunzilog.c: Zilog serial driver for Sparc systems.
2  *
3  * Driver for Zilog serial chips found on Sun workstations and
4  * servers.  This driver could actually be made more generic.
5  *
6  * This is based on the old drivers/sbus/char/zs.c code.  A lot
7  * of code has been simply moved over directly from there but
8  * much has been rewritten.  Credits therefore go out to Eddie
9  * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
10  * work there.
11  *
12  * Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
13  */
14
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/delay.h>
19 #include <linux/tty.h>
20 #include <linux/tty_flip.h>
21 #include <linux/major.h>
22 #include <linux/string.h>
23 #include <linux/ptrace.h>
24 #include <linux/ioport.h>
25 #include <linux/slab.h>
26 #include <linux/circ_buf.h>
27 #include <linux/serial.h>
28 #include <linux/sysrq.h>
29 #include <linux/console.h>
30 #include <linux/spinlock.h>
31 #ifdef CONFIG_SERIO
32 #include <linux/serio.h>
33 #endif
34 #include <linux/init.h>
35
36 #include <asm/io.h>
37 #include <asm/irq.h>
38 #include <asm/prom.h>
39 #include <asm/of_device.h>
40
41 #if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
42 #define SUPPORT_SYSRQ
43 #endif
44
45 #include <linux/serial_core.h>
46
47 #include "suncore.h"
48 #include "sunzilog.h"
49
50 /* On 32-bit sparcs we need to delay after register accesses
51  * to accommodate sun4 systems, but we do not need to flush writes.
52  * On 64-bit sparc we only need to flush single writes to ensure
53  * completion.
54  */
55 #ifndef CONFIG_SPARC64
56 #define ZSDELAY()               udelay(5)
57 #define ZSDELAY_LONG()          udelay(20)
58 #define ZS_WSYNC(channel)       do { } while (0)
59 #else
60 #define ZSDELAY()
61 #define ZSDELAY_LONG()
62 #define ZS_WSYNC(__channel) \
63         readb(&((__channel)->control))
64 #endif
65
66 #define ZS_CLOCK                4915200 /* Zilog input clock rate. */
67 #define ZS_CLOCK_DIVISOR        16      /* Divisor this driver uses. */
68
69 /*
70  * We wrap our port structure around the generic uart_port.
71  */
72 struct uart_sunzilog_port {
73         struct uart_port                port;
74
75         /* IRQ servicing chain.  */
76         struct uart_sunzilog_port       *next;
77
78         /* Current values of Zilog write registers.  */
79         unsigned char                   curregs[NUM_ZSREGS];
80
81         unsigned int                    flags;
82 #define SUNZILOG_FLAG_CONS_KEYB         0x00000001
83 #define SUNZILOG_FLAG_CONS_MOUSE        0x00000002
84 #define SUNZILOG_FLAG_IS_CONS           0x00000004
85 #define SUNZILOG_FLAG_IS_KGDB           0x00000008
86 #define SUNZILOG_FLAG_MODEM_STATUS      0x00000010
87 #define SUNZILOG_FLAG_IS_CHANNEL_A      0x00000020
88 #define SUNZILOG_FLAG_REGS_HELD         0x00000040
89 #define SUNZILOG_FLAG_TX_STOPPED        0x00000080
90 #define SUNZILOG_FLAG_TX_ACTIVE         0x00000100
91 #define SUNZILOG_FLAG_ESCC              0x00000200
92 #define SUNZILOG_FLAG_ISR_HANDLER       0x00000400
93
94         unsigned int cflag;
95
96         unsigned char                   parity_mask;
97         unsigned char                   prev_status;
98
99 #ifdef CONFIG_SERIO
100         struct serio                    serio;
101         int                             serio_open;
102 #endif
103 };
104
105 #define ZILOG_CHANNEL_FROM_PORT(PORT)   ((struct zilog_channel __iomem *)((PORT)->membase))
106 #define UART_ZILOG(PORT)                ((struct uart_sunzilog_port *)(PORT))
107
108 #define ZS_IS_KEYB(UP)  ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
109 #define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
110 #define ZS_IS_CONS(UP)  ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
111 #define ZS_IS_KGDB(UP)  ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
112 #define ZS_WANTS_MODEM_STATUS(UP)       ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
113 #define ZS_IS_CHANNEL_A(UP)     ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
114 #define ZS_REGS_HELD(UP)        ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
115 #define ZS_TX_STOPPED(UP)       ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
116 #define ZS_TX_ACTIVE(UP)        ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
117
118 /* Reading and writing Zilog8530 registers.  The delays are to make this
119  * driver work on the Sun4 which needs a settling delay after each chip
120  * register access, other machines handle this in hardware via auxiliary
121  * flip-flops which implement the settle time we do in software.
122  *
123  * The port lock must be held and local IRQs must be disabled
124  * when {read,write}_zsreg is invoked.
125  */
126 static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
127                                 unsigned char reg)
128 {
129         unsigned char retval;
130
131         writeb(reg, &channel->control);
132         ZSDELAY();
133         retval = readb(&channel->control);
134         ZSDELAY();
135
136         return retval;
137 }
138
139 static void write_zsreg(struct zilog_channel __iomem *channel,
140                         unsigned char reg, unsigned char value)
141 {
142         writeb(reg, &channel->control);
143         ZSDELAY();
144         writeb(value, &channel->control);
145         ZSDELAY();
146 }
147
148 static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
149 {
150         int i;
151
152         for (i = 0; i < 32; i++) {
153                 unsigned char regval;
154
155                 regval = readb(&channel->control);
156                 ZSDELAY();
157                 if (regval & Rx_CH_AV)
158                         break;
159
160                 regval = read_zsreg(channel, R1);
161                 readb(&channel->data);
162                 ZSDELAY();
163
164                 if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
165                         writeb(ERR_RES, &channel->control);
166                         ZSDELAY();
167                         ZS_WSYNC(channel);
168                 }
169         }
170 }
171
172 /* This function must only be called when the TX is not busy.  The UART
173  * port lock must be held and local interrupts disabled.
174  */
175 static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
176 {
177         int i;
178         int escc;
179         unsigned char r15;
180
181         /* Let pending transmits finish.  */
182         for (i = 0; i < 1000; i++) {
183                 unsigned char stat = read_zsreg(channel, R1);
184                 if (stat & ALL_SNT)
185                         break;
186                 udelay(100);
187         }
188
189         writeb(ERR_RES, &channel->control);
190         ZSDELAY();
191         ZS_WSYNC(channel);
192
193         sunzilog_clear_fifo(channel);
194
195         /* Disable all interrupts.  */
196         write_zsreg(channel, R1,
197                     regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
198
199         /* Set parity, sync config, stop bits, and clock divisor.  */
200         write_zsreg(channel, R4, regs[R4]);
201
202         /* Set misc. TX/RX control bits.  */
203         write_zsreg(channel, R10, regs[R10]);
204
205         /* Set TX/RX controls sans the enable bits.  */
206         write_zsreg(channel, R3, regs[R3] & ~RxENAB);
207         write_zsreg(channel, R5, regs[R5] & ~TxENAB);
208
209         /* Synchronous mode config.  */
210         write_zsreg(channel, R6, regs[R6]);
211         write_zsreg(channel, R7, regs[R7]);
212
213         /* Don't mess with the interrupt vector (R2, unused by us) and
214          * master interrupt control (R9).  We make sure this is setup
215          * properly at probe time then never touch it again.
216          */
217
218         /* Disable baud generator.  */
219         write_zsreg(channel, R14, regs[R14] & ~BRENAB);
220
221         /* Clock mode control.  */
222         write_zsreg(channel, R11, regs[R11]);
223
224         /* Lower and upper byte of baud rate generator divisor.  */
225         write_zsreg(channel, R12, regs[R12]);
226         write_zsreg(channel, R13, regs[R13]);
227         
228         /* Now rewrite R14, with BRENAB (if set).  */
229         write_zsreg(channel, R14, regs[R14]);
230
231         /* External status interrupt control.  */
232         write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
233
234         /* ESCC Extension Register */
235         r15 = read_zsreg(channel, R15);
236         if (r15 & 0x01) {
237                 write_zsreg(channel, R7,  regs[R7p]);
238
239                 /* External status interrupt and FIFO control.  */
240                 write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
241                 escc = 1;
242         } else {
243                  /* Clear FIFO bit case it is an issue */
244                 regs[R15] &= ~FIFOEN;
245                 escc = 0;
246         }
247
248         /* Reset external status interrupts.  */
249         write_zsreg(channel, R0, RES_EXT_INT); /* First Latch  */
250         write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
251
252         /* Rewrite R3/R5, this time without enables masked.  */
253         write_zsreg(channel, R3, regs[R3]);
254         write_zsreg(channel, R5, regs[R5]);
255
256         /* Rewrite R1, this time without IRQ enabled masked.  */
257         write_zsreg(channel, R1, regs[R1]);
258
259         return escc;
260 }
261
262 /* Reprogram the Zilog channel HW registers with the copies found in the
263  * software state struct.  If the transmitter is busy, we defer this update
264  * until the next TX complete interrupt.  Else, we do it right now.
265  *
266  * The UART port lock must be held and local interrupts disabled.
267  */
268 static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
269                                        struct zilog_channel __iomem *channel)
270 {
271         if (!ZS_REGS_HELD(up)) {
272                 if (ZS_TX_ACTIVE(up)) {
273                         up->flags |= SUNZILOG_FLAG_REGS_HELD;
274                 } else {
275                         __load_zsregs(channel, up->curregs);
276                 }
277         }
278 }
279
280 static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
281 {
282         unsigned int cur_cflag = up->cflag;
283         int brg, new_baud;
284
285         up->cflag &= ~CBAUD;
286         up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
287
288         brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
289         up->curregs[R12] = (brg & 0xff);
290         up->curregs[R13] = (brg >> 8) & 0xff;
291         sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
292 }
293
294 static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
295                                          unsigned char ch, int is_break)
296 {
297         if (ZS_IS_KEYB(up)) {
298                 /* Stop-A is handled by drivers/char/keyboard.c now. */
299 #ifdef CONFIG_SERIO
300                 if (up->serio_open)
301                         serio_interrupt(&up->serio, ch, 0);
302 #endif
303         } else if (ZS_IS_MOUSE(up)) {
304                 int ret = suncore_mouse_baud_detection(ch, is_break);
305
306                 switch (ret) {
307                 case 2:
308                         sunzilog_change_mouse_baud(up);
309                         /* fallthru */
310                 case 1:
311                         break;
312
313                 case 0:
314 #ifdef CONFIG_SERIO
315                         if (up->serio_open)
316                                 serio_interrupt(&up->serio, ch, 0);
317 #endif
318                         break;
319                 };
320         }
321 }
322
323 static struct tty_struct *
324 sunzilog_receive_chars(struct uart_sunzilog_port *up,
325                        struct zilog_channel __iomem *channel)
326 {
327         struct tty_struct *tty;
328         unsigned char ch, r1, flag;
329
330         tty = NULL;
331         if (up->port.info != NULL &&            /* Unopened serial console */
332             up->port.info->tty != NULL)         /* Keyboard || mouse */
333                 tty = up->port.info->tty;
334
335         for (;;) {
336
337                 r1 = read_zsreg(channel, R1);
338                 if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
339                         writeb(ERR_RES, &channel->control);
340                         ZSDELAY();
341                         ZS_WSYNC(channel);
342                 }
343
344                 ch = readb(&channel->control);
345                 ZSDELAY();
346
347                 /* This funny hack depends upon BRK_ABRT not interfering
348                  * with the other bits we care about in R1.
349                  */
350                 if (ch & BRK_ABRT)
351                         r1 |= BRK_ABRT;
352
353                 if (!(ch & Rx_CH_AV))
354                         break;
355
356                 ch = readb(&channel->data);
357                 ZSDELAY();
358
359                 ch &= up->parity_mask;
360
361                 if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
362                         sunzilog_kbdms_receive_chars(up, ch, 0);
363                         continue;
364                 }
365
366                 if (tty == NULL) {
367                         uart_handle_sysrq_char(&up->port, ch);
368                         continue;
369                 }
370
371                 /* A real serial line, record the character and status.  */
372                 flag = TTY_NORMAL;
373                 up->port.icount.rx++;
374                 if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
375                         if (r1 & BRK_ABRT) {
376                                 r1 &= ~(PAR_ERR | CRC_ERR);
377                                 up->port.icount.brk++;
378                                 if (uart_handle_break(&up->port))
379                                         continue;
380                         }
381                         else if (r1 & PAR_ERR)
382                                 up->port.icount.parity++;
383                         else if (r1 & CRC_ERR)
384                                 up->port.icount.frame++;
385                         if (r1 & Rx_OVR)
386                                 up->port.icount.overrun++;
387                         r1 &= up->port.read_status_mask;
388                         if (r1 & BRK_ABRT)
389                                 flag = TTY_BREAK;
390                         else if (r1 & PAR_ERR)
391                                 flag = TTY_PARITY;
392                         else if (r1 & CRC_ERR)
393                                 flag = TTY_FRAME;
394                 }
395                 if (uart_handle_sysrq_char(&up->port, ch))
396                         continue;
397
398                 if (up->port.ignore_status_mask == 0xff ||
399                     (r1 & up->port.ignore_status_mask) == 0) {
400                         tty_insert_flip_char(tty, ch, flag);
401                 }
402                 if (r1 & Rx_OVR)
403                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
404         }
405
406         return tty;
407 }
408
409 static void sunzilog_status_handle(struct uart_sunzilog_port *up,
410                                    struct zilog_channel __iomem *channel)
411 {
412         unsigned char status;
413
414         status = readb(&channel->control);
415         ZSDELAY();
416
417         writeb(RES_EXT_INT, &channel->control);
418         ZSDELAY();
419         ZS_WSYNC(channel);
420
421         if (status & BRK_ABRT) {
422                 if (ZS_IS_MOUSE(up))
423                         sunzilog_kbdms_receive_chars(up, 0, 1);
424                 if (ZS_IS_CONS(up)) {
425                         /* Wait for BREAK to deassert to avoid potentially
426                          * confusing the PROM.
427                          */
428                         while (1) {
429                                 status = readb(&channel->control);
430                                 ZSDELAY();
431                                 if (!(status & BRK_ABRT))
432                                         break;
433                         }
434                         sun_do_break();
435                         return;
436                 }
437         }
438
439         if (ZS_WANTS_MODEM_STATUS(up)) {
440                 if (status & SYNC)
441                         up->port.icount.dsr++;
442
443                 /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
444                  * But it does not tell us which bit has changed, we have to keep
445                  * track of this ourselves.
446                  */
447                 if ((status ^ up->prev_status) ^ DCD)
448                         uart_handle_dcd_change(&up->port,
449                                                (status & DCD));
450                 if ((status ^ up->prev_status) ^ CTS)
451                         uart_handle_cts_change(&up->port,
452                                                (status & CTS));
453
454                 wake_up_interruptible(&up->port.info->delta_msr_wait);
455         }
456
457         up->prev_status = status;
458 }
459
460 static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
461                                     struct zilog_channel __iomem *channel)
462 {
463         struct circ_buf *xmit;
464
465         if (ZS_IS_CONS(up)) {
466                 unsigned char status = readb(&channel->control);
467                 ZSDELAY();
468
469                 /* TX still busy?  Just wait for the next TX done interrupt.
470                  *
471                  * It can occur because of how we do serial console writes.  It would
472                  * be nice to transmit console writes just like we normally would for
473                  * a TTY line. (ie. buffered and TX interrupt driven).  That is not
474                  * easy because console writes cannot sleep.  One solution might be
475                  * to poll on enough port->xmit space becomming free.  -DaveM
476                  */
477                 if (!(status & Tx_BUF_EMP))
478                         return;
479         }
480
481         up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
482
483         if (ZS_REGS_HELD(up)) {
484                 __load_zsregs(channel, up->curregs);
485                 up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
486         }
487
488         if (ZS_TX_STOPPED(up)) {
489                 up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
490                 goto ack_tx_int;
491         }
492
493         if (up->port.x_char) {
494                 up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
495                 writeb(up->port.x_char, &channel->data);
496                 ZSDELAY();
497                 ZS_WSYNC(channel);
498
499                 up->port.icount.tx++;
500                 up->port.x_char = 0;
501                 return;
502         }
503
504         if (up->port.info == NULL)
505                 goto ack_tx_int;
506         xmit = &up->port.info->xmit;
507         if (uart_circ_empty(xmit))
508                 goto ack_tx_int;
509
510         if (uart_tx_stopped(&up->port))
511                 goto ack_tx_int;
512
513         up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
514         writeb(xmit->buf[xmit->tail], &channel->data);
515         ZSDELAY();
516         ZS_WSYNC(channel);
517
518         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
519         up->port.icount.tx++;
520
521         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
522                 uart_write_wakeup(&up->port);
523
524         return;
525
526 ack_tx_int:
527         writeb(RES_Tx_P, &channel->control);
528         ZSDELAY();
529         ZS_WSYNC(channel);
530 }
531
532 static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
533 {
534         struct uart_sunzilog_port *up = dev_id;
535
536         while (up) {
537                 struct zilog_channel __iomem *channel
538                         = ZILOG_CHANNEL_FROM_PORT(&up->port);
539                 struct tty_struct *tty;
540                 unsigned char r3;
541
542                 spin_lock(&up->port.lock);
543                 r3 = read_zsreg(channel, R3);
544
545                 /* Channel A */
546                 tty = NULL;
547                 if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
548                         writeb(RES_H_IUS, &channel->control);
549                         ZSDELAY();
550                         ZS_WSYNC(channel);
551
552                         if (r3 & CHARxIP)
553                                 tty = sunzilog_receive_chars(up, channel);
554                         if (r3 & CHAEXT)
555                                 sunzilog_status_handle(up, channel);
556                         if (r3 & CHATxIP)
557                                 sunzilog_transmit_chars(up, channel);
558                 }
559                 spin_unlock(&up->port.lock);
560
561                 if (tty)
562                         tty_flip_buffer_push(tty);
563
564                 /* Channel B */
565                 up = up->next;
566                 channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
567
568                 spin_lock(&up->port.lock);
569                 tty = NULL;
570                 if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
571                         writeb(RES_H_IUS, &channel->control);
572                         ZSDELAY();
573                         ZS_WSYNC(channel);
574
575                         if (r3 & CHBRxIP)
576                                 tty = sunzilog_receive_chars(up, channel);
577                         if (r3 & CHBEXT)
578                                 sunzilog_status_handle(up, channel);
579                         if (r3 & CHBTxIP)
580                                 sunzilog_transmit_chars(up, channel);
581                 }
582                 spin_unlock(&up->port.lock);
583
584                 if (tty)
585                         tty_flip_buffer_push(tty);
586
587                 up = up->next;
588         }
589
590         return IRQ_HANDLED;
591 }
592
593 /* A convenient way to quickly get R0 status.  The caller must _not_ hold the
594  * port lock, it is acquired here.
595  */
596 static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
597 {
598         struct zilog_channel __iomem *channel;
599         unsigned char status;
600
601         channel = ZILOG_CHANNEL_FROM_PORT(port);
602         status = readb(&channel->control);
603         ZSDELAY();
604
605         return status;
606 }
607
608 /* The port lock is not held.  */
609 static unsigned int sunzilog_tx_empty(struct uart_port *port)
610 {
611         unsigned long flags;
612         unsigned char status;
613         unsigned int ret;
614
615         spin_lock_irqsave(&port->lock, flags);
616
617         status = sunzilog_read_channel_status(port);
618
619         spin_unlock_irqrestore(&port->lock, flags);
620
621         if (status & Tx_BUF_EMP)
622                 ret = TIOCSER_TEMT;
623         else
624                 ret = 0;
625
626         return ret;
627 }
628
629 /* The port lock is held and interrupts are disabled.  */
630 static unsigned int sunzilog_get_mctrl(struct uart_port *port)
631 {
632         unsigned char status;
633         unsigned int ret;
634
635         status = sunzilog_read_channel_status(port);
636
637         ret = 0;
638         if (status & DCD)
639                 ret |= TIOCM_CAR;
640         if (status & SYNC)
641                 ret |= TIOCM_DSR;
642         if (status & CTS)
643                 ret |= TIOCM_CTS;
644
645         return ret;
646 }
647
648 /* The port lock is held and interrupts are disabled.  */
649 static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
650 {
651         struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
652         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
653         unsigned char set_bits, clear_bits;
654
655         set_bits = clear_bits = 0;
656
657         if (mctrl & TIOCM_RTS)
658                 set_bits |= RTS;
659         else
660                 clear_bits |= RTS;
661         if (mctrl & TIOCM_DTR)
662                 set_bits |= DTR;
663         else
664                 clear_bits |= DTR;
665
666         /* NOTE: Not subject to 'transmitter active' rule.  */ 
667         up->curregs[R5] |= set_bits;
668         up->curregs[R5] &= ~clear_bits;
669         write_zsreg(channel, R5, up->curregs[R5]);
670 }
671
672 /* The port lock is held and interrupts are disabled.  */
673 static void sunzilog_stop_tx(struct uart_port *port)
674 {
675         struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
676
677         up->flags |= SUNZILOG_FLAG_TX_STOPPED;
678 }
679
680 /* The port lock is held and interrupts are disabled.  */
681 static void sunzilog_start_tx(struct uart_port *port)
682 {
683         struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
684         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
685         unsigned char status;
686
687         up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
688         up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
689
690         status = readb(&channel->control);
691         ZSDELAY();
692
693         /* TX busy?  Just wait for the TX done interrupt.  */
694         if (!(status & Tx_BUF_EMP))
695                 return;
696
697         /* Send the first character to jump-start the TX done
698          * IRQ sending engine.
699          */
700         if (port->x_char) {
701                 writeb(port->x_char, &channel->data);
702                 ZSDELAY();
703                 ZS_WSYNC(channel);
704
705                 port->icount.tx++;
706                 port->x_char = 0;
707         } else {
708                 struct circ_buf *xmit = &port->info->xmit;
709
710                 writeb(xmit->buf[xmit->tail], &channel->data);
711                 ZSDELAY();
712                 ZS_WSYNC(channel);
713
714                 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
715                 port->icount.tx++;
716
717                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
718                         uart_write_wakeup(&up->port);
719         }
720 }
721
722 /* The port lock is held.  */
723 static void sunzilog_stop_rx(struct uart_port *port)
724 {
725         struct uart_sunzilog_port *up = UART_ZILOG(port);
726         struct zilog_channel __iomem *channel;
727
728         if (ZS_IS_CONS(up))
729                 return;
730
731         channel = ZILOG_CHANNEL_FROM_PORT(port);
732
733         /* Disable all RX interrupts.  */
734         up->curregs[R1] &= ~RxINT_MASK;
735         sunzilog_maybe_update_regs(up, channel);
736 }
737
738 /* The port lock is held.  */
739 static void sunzilog_enable_ms(struct uart_port *port)
740 {
741         struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
742         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
743         unsigned char new_reg;
744
745         new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
746         if (new_reg != up->curregs[R15]) {
747                 up->curregs[R15] = new_reg;
748
749                 /* NOTE: Not subject to 'transmitter active' rule.  */ 
750                 write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
751         }
752 }
753
754 /* The port lock is not held.  */
755 static void sunzilog_break_ctl(struct uart_port *port, int break_state)
756 {
757         struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
758         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
759         unsigned char set_bits, clear_bits, new_reg;
760         unsigned long flags;
761
762         set_bits = clear_bits = 0;
763
764         if (break_state)
765                 set_bits |= SND_BRK;
766         else
767                 clear_bits |= SND_BRK;
768
769         spin_lock_irqsave(&port->lock, flags);
770
771         new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
772         if (new_reg != up->curregs[R5]) {
773                 up->curregs[R5] = new_reg;
774
775                 /* NOTE: Not subject to 'transmitter active' rule.  */ 
776                 write_zsreg(channel, R5, up->curregs[R5]);
777         }
778
779         spin_unlock_irqrestore(&port->lock, flags);
780 }
781
782 static void __sunzilog_startup(struct uart_sunzilog_port *up)
783 {
784         struct zilog_channel __iomem *channel;
785
786         channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
787         up->prev_status = readb(&channel->control);
788
789         /* Enable receiver and transmitter.  */
790         up->curregs[R3] |= RxENAB;
791         up->curregs[R5] |= TxENAB;
792
793         up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
794         sunzilog_maybe_update_regs(up, channel);
795 }
796
797 static int sunzilog_startup(struct uart_port *port)
798 {
799         struct uart_sunzilog_port *up = UART_ZILOG(port);
800         unsigned long flags;
801
802         if (ZS_IS_CONS(up))
803                 return 0;
804
805         spin_lock_irqsave(&port->lock, flags);
806         __sunzilog_startup(up);
807         spin_unlock_irqrestore(&port->lock, flags);
808         return 0;
809 }
810
811 /*
812  * The test for ZS_IS_CONS is explained by the following e-mail:
813  *****
814  * From: Russell King <rmk@arm.linux.org.uk>
815  * Date: Sun, 8 Dec 2002 10:18:38 +0000
816  *
817  * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
818  * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
819  * > and I noticed that something is not right with reference
820  * > counting in this case. It seems that when the console
821  * > is open by kernel initially, this is not accounted
822  * > as an open, and uart_startup is not called.
823  *
824  * That is correct.  We are unable to call uart_startup when the serial
825  * console is initialised because it may need to allocate memory (as
826  * request_irq does) and the memory allocators may not have been
827  * initialised.
828  *
829  * 1. initialise the port into a state where it can send characters in the
830  *    console write method.
831  *
832  * 2. don't do the actual hardware shutdown in your shutdown() method (but
833  *    do the normal software shutdown - ie, free irqs etc)
834  *****
835  */
836 static void sunzilog_shutdown(struct uart_port *port)
837 {
838         struct uart_sunzilog_port *up = UART_ZILOG(port);
839         struct zilog_channel __iomem *channel;
840         unsigned long flags;
841
842         if (ZS_IS_CONS(up))
843                 return;
844
845         spin_lock_irqsave(&port->lock, flags);
846
847         channel = ZILOG_CHANNEL_FROM_PORT(port);
848
849         /* Disable receiver and transmitter.  */
850         up->curregs[R3] &= ~RxENAB;
851         up->curregs[R5] &= ~TxENAB;
852
853         /* Disable all interrupts and BRK assertion.  */
854         up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
855         up->curregs[R5] &= ~SND_BRK;
856         sunzilog_maybe_update_regs(up, channel);
857
858         spin_unlock_irqrestore(&port->lock, flags);
859 }
860
861 /* Shared by TTY driver and serial console setup.  The port lock is held
862  * and local interrupts are disabled.
863  */
864 static void
865 sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
866                        unsigned int iflag, int brg)
867 {
868
869         up->curregs[R10] = NRZ;
870         up->curregs[R11] = TCBR | RCBR;
871
872         /* Program BAUD and clock source. */
873         up->curregs[R4] &= ~XCLK_MASK;
874         up->curregs[R4] |= X16CLK;
875         up->curregs[R12] = brg & 0xff;
876         up->curregs[R13] = (brg >> 8) & 0xff;
877         up->curregs[R14] = BRSRC | BRENAB;
878
879         /* Character size, stop bits, and parity. */
880         up->curregs[R3] &= ~RxN_MASK;
881         up->curregs[R5] &= ~TxN_MASK;
882         switch (cflag & CSIZE) {
883         case CS5:
884                 up->curregs[R3] |= Rx5;
885                 up->curregs[R5] |= Tx5;
886                 up->parity_mask = 0x1f;
887                 break;
888         case CS6:
889                 up->curregs[R3] |= Rx6;
890                 up->curregs[R5] |= Tx6;
891                 up->parity_mask = 0x3f;
892                 break;
893         case CS7:
894                 up->curregs[R3] |= Rx7;
895                 up->curregs[R5] |= Tx7;
896                 up->parity_mask = 0x7f;
897                 break;
898         case CS8:
899         default:
900                 up->curregs[R3] |= Rx8;
901                 up->curregs[R5] |= Tx8;
902                 up->parity_mask = 0xff;
903                 break;
904         };
905         up->curregs[R4] &= ~0x0c;
906         if (cflag & CSTOPB)
907                 up->curregs[R4] |= SB2;
908         else
909                 up->curregs[R4] |= SB1;
910         if (cflag & PARENB)
911                 up->curregs[R4] |= PAR_ENAB;
912         else
913                 up->curregs[R4] &= ~PAR_ENAB;
914         if (!(cflag & PARODD))
915                 up->curregs[R4] |= PAR_EVEN;
916         else
917                 up->curregs[R4] &= ~PAR_EVEN;
918
919         up->port.read_status_mask = Rx_OVR;
920         if (iflag & INPCK)
921                 up->port.read_status_mask |= CRC_ERR | PAR_ERR;
922         if (iflag & (BRKINT | PARMRK))
923                 up->port.read_status_mask |= BRK_ABRT;
924
925         up->port.ignore_status_mask = 0;
926         if (iflag & IGNPAR)
927                 up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
928         if (iflag & IGNBRK) {
929                 up->port.ignore_status_mask |= BRK_ABRT;
930                 if (iflag & IGNPAR)
931                         up->port.ignore_status_mask |= Rx_OVR;
932         }
933
934         if ((cflag & CREAD) == 0)
935                 up->port.ignore_status_mask = 0xff;
936 }
937
938 /* The port lock is not held.  */
939 static void
940 sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
941                      struct ktermios *old)
942 {
943         struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
944         unsigned long flags;
945         int baud, brg;
946
947         baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
948
949         spin_lock_irqsave(&up->port.lock, flags);
950
951         brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
952
953         sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
954
955         if (UART_ENABLE_MS(&up->port, termios->c_cflag))
956                 up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
957         else
958                 up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
959
960         up->cflag = termios->c_cflag;
961
962         sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
963
964         uart_update_timeout(port, termios->c_cflag, baud);
965
966         spin_unlock_irqrestore(&up->port.lock, flags);
967 }
968
969 static const char *sunzilog_type(struct uart_port *port)
970 {
971         struct uart_sunzilog_port *up = UART_ZILOG(port);
972
973         return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
974 }
975
976 /* We do not request/release mappings of the registers here, this
977  * happens at early serial probe time.
978  */
979 static void sunzilog_release_port(struct uart_port *port)
980 {
981 }
982
983 static int sunzilog_request_port(struct uart_port *port)
984 {
985         return 0;
986 }
987
988 /* These do not need to do anything interesting either.  */
989 static void sunzilog_config_port(struct uart_port *port, int flags)
990 {
991 }
992
993 /* We do not support letting the user mess with the divisor, IRQ, etc. */
994 static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
995 {
996         return -EINVAL;
997 }
998
999 static struct uart_ops sunzilog_pops = {
1000         .tx_empty       =       sunzilog_tx_empty,
1001         .set_mctrl      =       sunzilog_set_mctrl,
1002         .get_mctrl      =       sunzilog_get_mctrl,
1003         .stop_tx        =       sunzilog_stop_tx,
1004         .start_tx       =       sunzilog_start_tx,
1005         .stop_rx        =       sunzilog_stop_rx,
1006         .enable_ms      =       sunzilog_enable_ms,
1007         .break_ctl      =       sunzilog_break_ctl,
1008         .startup        =       sunzilog_startup,
1009         .shutdown       =       sunzilog_shutdown,
1010         .set_termios    =       sunzilog_set_termios,
1011         .type           =       sunzilog_type,
1012         .release_port   =       sunzilog_release_port,
1013         .request_port   =       sunzilog_request_port,
1014         .config_port    =       sunzilog_config_port,
1015         .verify_port    =       sunzilog_verify_port,
1016 };
1017
1018 static struct uart_sunzilog_port *sunzilog_port_table;
1019 static struct zilog_layout __iomem **sunzilog_chip_regs;
1020
1021 static struct uart_sunzilog_port *sunzilog_irq_chain;
1022
1023 static struct uart_driver sunzilog_reg = {
1024         .owner          =       THIS_MODULE,
1025         .driver_name    =       "ttyS",
1026         .dev_name       =       "ttyS",
1027         .major          =       TTY_MAJOR,
1028 };
1029
1030 static int __init sunzilog_alloc_tables(int num_sunzilog)
1031 {
1032         struct uart_sunzilog_port *up;
1033         unsigned long size;
1034         int num_channels = num_sunzilog * 2;
1035         int i;
1036
1037         size = num_channels * sizeof(struct uart_sunzilog_port);
1038         sunzilog_port_table = kzalloc(size, GFP_KERNEL);
1039         if (!sunzilog_port_table)
1040                 return -ENOMEM;
1041
1042         for (i = 0; i < num_channels; i++) {
1043                 up = &sunzilog_port_table[i];
1044
1045                 spin_lock_init(&up->port.lock);
1046
1047                 if (i == 0)
1048                         sunzilog_irq_chain = up;
1049
1050                 if (i < num_channels - 1)
1051                         up->next = up + 1;
1052                 else
1053                         up->next = NULL;
1054         }
1055
1056         size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
1057         sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
1058         if (!sunzilog_chip_regs) {
1059                 kfree(sunzilog_port_table);
1060                 sunzilog_irq_chain = NULL;
1061                 return -ENOMEM;
1062         }
1063
1064         return 0;
1065 }
1066
1067 static void sunzilog_free_tables(void)
1068 {
1069         kfree(sunzilog_port_table);
1070         sunzilog_irq_chain = NULL;
1071         kfree(sunzilog_chip_regs);
1072 }
1073
1074 #define ZS_PUT_CHAR_MAX_DELAY   2000    /* 10 ms */
1075
1076 static void sunzilog_putchar(struct uart_port *port, int ch)
1077 {
1078         struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
1079         int loops = ZS_PUT_CHAR_MAX_DELAY;
1080
1081         /* This is a timed polling loop so do not switch the explicit
1082          * udelay with ZSDELAY as that is a NOP on some platforms.  -DaveM
1083          */
1084         do {
1085                 unsigned char val = readb(&channel->control);
1086                 if (val & Tx_BUF_EMP) {
1087                         ZSDELAY();
1088                         break;
1089                 }
1090                 udelay(5);
1091         } while (--loops);
1092
1093         writeb(ch, &channel->data);
1094         ZSDELAY();
1095         ZS_WSYNC(channel);
1096 }
1097
1098 #ifdef CONFIG_SERIO
1099
1100 static DEFINE_SPINLOCK(sunzilog_serio_lock);
1101
1102 static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
1103 {
1104         struct uart_sunzilog_port *up = serio->port_data;
1105         unsigned long flags;
1106
1107         spin_lock_irqsave(&sunzilog_serio_lock, flags);
1108
1109         sunzilog_putchar(&up->port, ch);
1110
1111         spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1112
1113         return 0;
1114 }
1115
1116 static int sunzilog_serio_open(struct serio *serio)
1117 {
1118         struct uart_sunzilog_port *up = serio->port_data;
1119         unsigned long flags;
1120         int ret;
1121
1122         spin_lock_irqsave(&sunzilog_serio_lock, flags);
1123         if (!up->serio_open) {
1124                 up->serio_open = 1;
1125                 ret = 0;
1126         } else
1127                 ret = -EBUSY;
1128         spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1129
1130         return ret;
1131 }
1132
1133 static void sunzilog_serio_close(struct serio *serio)
1134 {
1135         struct uart_sunzilog_port *up = serio->port_data;
1136         unsigned long flags;
1137
1138         spin_lock_irqsave(&sunzilog_serio_lock, flags);
1139         up->serio_open = 0;
1140         spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
1141 }
1142
1143 #endif /* CONFIG_SERIO */
1144
1145 #ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
1146 static void
1147 sunzilog_console_write(struct console *con, const char *s, unsigned int count)
1148 {
1149         struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1150         unsigned long flags;
1151         int locked = 1;
1152
1153         local_irq_save(flags);
1154         if (up->port.sysrq) {
1155                 locked = 0;
1156         } else if (oops_in_progress) {
1157                 locked = spin_trylock(&up->port.lock);
1158         } else
1159                 spin_lock(&up->port.lock);
1160
1161         uart_console_write(&up->port, s, count, sunzilog_putchar);
1162         udelay(2);
1163
1164         if (locked)
1165                 spin_unlock(&up->port.lock);
1166         local_irq_restore(flags);
1167 }
1168
1169 static int __init sunzilog_console_setup(struct console *con, char *options)
1170 {
1171         struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
1172         unsigned long flags;
1173         int baud, brg;
1174
1175         if (up->port.type != PORT_SUNZILOG)
1176                 return -1;
1177
1178         printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
1179                (sunzilog_reg.minor - 64) + con->index, con->index);
1180
1181         /* Get firmware console settings.  */
1182         sunserial_console_termios(con);
1183
1184         /* Firmware console speed is limited to 150-->38400 baud so
1185          * this hackish cflag thing is OK.
1186          */
1187         switch (con->cflag & CBAUD) {
1188         case B150: baud = 150; break;
1189         case B300: baud = 300; break;
1190         case B600: baud = 600; break;
1191         case B1200: baud = 1200; break;
1192         case B2400: baud = 2400; break;
1193         case B4800: baud = 4800; break;
1194         default: case B9600: baud = 9600; break;
1195         case B19200: baud = 19200; break;
1196         case B38400: baud = 38400; break;
1197         };
1198
1199         brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1200
1201         spin_lock_irqsave(&up->port.lock, flags);
1202
1203         up->curregs[R15] |= BRKIE;
1204         sunzilog_convert_to_zs(up, con->cflag, 0, brg);
1205
1206         sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1207         __sunzilog_startup(up);
1208
1209         spin_unlock_irqrestore(&up->port.lock, flags);
1210
1211         return 0;
1212 }
1213
1214 static struct console sunzilog_console_ops = {
1215         .name   =       "ttyS",
1216         .write  =       sunzilog_console_write,
1217         .device =       uart_console_device,
1218         .setup  =       sunzilog_console_setup,
1219         .flags  =       CON_PRINTBUFFER,
1220         .index  =       -1,
1221         .data   =       &sunzilog_reg,
1222 };
1223
1224 static inline struct console *SUNZILOG_CONSOLE(void)
1225 {
1226         return &sunzilog_console_ops;
1227 }
1228
1229 #else
1230 #define SUNZILOG_CONSOLE()      (NULL)
1231 #endif
1232
1233 static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
1234 {
1235         int baud, brg;
1236
1237         if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1238                 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1239                 baud = 1200;
1240         } else {
1241                 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1242                 baud = 4800;
1243         }
1244
1245         up->curregs[R15] |= BRKIE;
1246         brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1247         sunzilog_convert_to_zs(up, up->cflag, 0, brg);
1248         sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
1249         __sunzilog_startup(up);
1250 }
1251
1252 #ifdef CONFIG_SERIO
1253 static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
1254 {
1255         struct serio *serio = &up->serio;
1256
1257         serio->port_data = up;
1258
1259         serio->id.type = SERIO_RS232;
1260         if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
1261                 serio->id.proto = SERIO_SUNKBD;
1262                 strlcpy(serio->name, "zskbd", sizeof(serio->name));
1263         } else {
1264                 serio->id.proto = SERIO_SUN;
1265                 serio->id.extra = 1;
1266                 strlcpy(serio->name, "zsms", sizeof(serio->name));
1267         }
1268         strlcpy(serio->phys,
1269                 ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
1270                  "zs/serio0" : "zs/serio1"),
1271                 sizeof(serio->phys));
1272
1273         serio->write = sunzilog_serio_write;
1274         serio->open = sunzilog_serio_open;
1275         serio->close = sunzilog_serio_close;
1276         serio->dev.parent = up->port.dev;
1277
1278         serio_register_port(serio);
1279 }
1280 #endif
1281
1282 static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
1283 {
1284         struct zilog_channel __iomem *channel;
1285         unsigned long flags;
1286         int baud, brg;
1287
1288         channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
1289
1290         spin_lock_irqsave(&up->port.lock, flags);
1291         if (ZS_IS_CHANNEL_A(up)) {
1292                 write_zsreg(channel, R9, FHWRES);
1293                 ZSDELAY_LONG();
1294                 (void) read_zsreg(channel, R0);
1295         }
1296
1297         if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1298                          SUNZILOG_FLAG_CONS_MOUSE)) {
1299                 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1300                 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1301                 up->curregs[R3] = RxENAB | Rx8;
1302                 up->curregs[R5] = TxENAB | Tx8;
1303                 up->curregs[R6] = 0x00; /* SDLC Address */
1304                 up->curregs[R7] = 0x7E; /* SDLC Flag    */
1305                 up->curregs[R9] = NV;
1306                 up->curregs[R7p] = 0x00;
1307                 sunzilog_init_kbdms(up, up->port.line);
1308                 /* Only enable interrupts if an ISR handler available */
1309                 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1310                         up->curregs[R9] |= MIE;
1311                 write_zsreg(channel, R9, up->curregs[R9]);
1312         } else {
1313                 /* Normal serial TTY. */
1314                 up->parity_mask = 0xff;
1315                 up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
1316                 up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
1317                 up->curregs[R3] = RxENAB | Rx8;
1318                 up->curregs[R5] = TxENAB | Tx8;
1319                 up->curregs[R6] = 0x00; /* SDLC Address */
1320                 up->curregs[R7] = 0x7E; /* SDLC Flag    */
1321                 up->curregs[R9] = NV;
1322                 up->curregs[R10] = NRZ;
1323                 up->curregs[R11] = TCBR | RCBR;
1324                 baud = 9600;
1325                 brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
1326                 up->curregs[R12] = (brg & 0xff);
1327                 up->curregs[R13] = (brg >> 8) & 0xff;
1328                 up->curregs[R14] = BRSRC | BRENAB;
1329                 up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
1330                 up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
1331                 if (__load_zsregs(channel, up->curregs)) {
1332                         up->flags |= SUNZILOG_FLAG_ESCC;
1333                 }
1334                 /* Only enable interrupts if an ISR handler available */
1335                 if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
1336                         up->curregs[R9] |= MIE;
1337                 write_zsreg(channel, R9, up->curregs[R9]);
1338         }
1339
1340         spin_unlock_irqrestore(&up->port.lock, flags);
1341
1342 #ifdef CONFIG_SERIO
1343         if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
1344                          SUNZILOG_FLAG_CONS_MOUSE))
1345                 sunzilog_register_serio(up);
1346 #endif
1347 }
1348
1349 static int zilog_irq = -1;
1350
1351 static int __devinit zs_probe(struct of_device *op, const struct of_device_id *match)
1352 {
1353         static int inst;
1354         struct uart_sunzilog_port *up;
1355         struct zilog_layout __iomem *rp;
1356         int keyboard_mouse;
1357         int err;
1358
1359         keyboard_mouse = 0;
1360         if (of_find_property(op->node, "keyboard", NULL))
1361                 keyboard_mouse = 1;
1362
1363         sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
1364                                               sizeof(struct zilog_layout),
1365                                               "zs");
1366         if (!sunzilog_chip_regs[inst])
1367                 return -ENOMEM;
1368
1369         rp = sunzilog_chip_regs[inst];
1370
1371         if (zilog_irq == -1)
1372                 zilog_irq = op->irqs[0];
1373
1374         up = &sunzilog_port_table[inst * 2];
1375
1376         /* Channel A */
1377         up[0].port.mapbase = op->resource[0].start + 0x00;
1378         up[0].port.membase = (void __iomem *) &rp->channelA;
1379         up[0].port.iotype = UPIO_MEM;
1380         up[0].port.irq = op->irqs[0];
1381         up[0].port.uartclk = ZS_CLOCK;
1382         up[0].port.fifosize = 1;
1383         up[0].port.ops = &sunzilog_pops;
1384         up[0].port.type = PORT_SUNZILOG;
1385         up[0].port.flags = 0;
1386         up[0].port.line = (inst * 2) + 0;
1387         up[0].port.dev = &op->dev;
1388         up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
1389         if (keyboard_mouse)
1390                 up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
1391         sunzilog_init_hw(&up[0]);
1392
1393         /* Channel B */
1394         up[1].port.mapbase = op->resource[0].start + 0x04;
1395         up[1].port.membase = (void __iomem *) &rp->channelB;
1396         up[1].port.iotype = UPIO_MEM;
1397         up[1].port.irq = op->irqs[0];
1398         up[1].port.uartclk = ZS_CLOCK;
1399         up[1].port.fifosize = 1;
1400         up[1].port.ops = &sunzilog_pops;
1401         up[1].port.type = PORT_SUNZILOG;
1402         up[1].port.flags = 0;
1403         up[1].port.line = (inst * 2) + 1;
1404         up[1].port.dev = &op->dev;
1405         up[1].flags |= 0;
1406         if (keyboard_mouse)
1407                 up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
1408         sunzilog_init_hw(&up[1]);
1409
1410         if (!keyboard_mouse) {
1411                 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1412                                             &sunzilog_reg, up[0].port.line))
1413                         up->flags |= SUNZILOG_FLAG_IS_CONS;
1414                 err = uart_add_one_port(&sunzilog_reg, &up[0].port);
1415                 if (err) {
1416                         of_iounmap(&op->resource[0],
1417                                    rp, sizeof(struct zilog_layout));
1418                         return err;
1419                 }
1420                 if (sunserial_console_match(SUNZILOG_CONSOLE(), op->node,
1421                                             &sunzilog_reg, up[1].port.line))
1422                         up->flags |= SUNZILOG_FLAG_IS_CONS;
1423                 err = uart_add_one_port(&sunzilog_reg, &up[1].port);
1424                 if (err) {
1425                         uart_remove_one_port(&sunzilog_reg, &up[0].port);
1426                         of_iounmap(&op->resource[0],
1427                                    rp, sizeof(struct zilog_layout));
1428                         return err;
1429                 }
1430         } else {
1431                 printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
1432                        "is a %s\n",
1433                        op->dev.bus_id,
1434                        (unsigned long long) up[0].port.mapbase,
1435                        op->irqs[0], sunzilog_type(&up[0].port));
1436                 printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
1437                        "is a %s\n",
1438                        op->dev.bus_id,
1439                        (unsigned long long) up[1].port.mapbase,
1440                        op->irqs[0], sunzilog_type(&up[1].port));
1441         }
1442
1443         dev_set_drvdata(&op->dev, &up[0]);
1444
1445         inst++;
1446
1447         return 0;
1448 }
1449
1450 static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
1451 {
1452         if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
1453 #ifdef CONFIG_SERIO
1454                 serio_unregister_port(&up->serio);
1455 #endif
1456         } else
1457                 uart_remove_one_port(&sunzilog_reg, &up->port);
1458 }
1459
1460 static int __devexit zs_remove(struct of_device *op)
1461 {
1462         struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
1463         struct zilog_layout __iomem *regs;
1464
1465         zs_remove_one(&up[0]);
1466         zs_remove_one(&up[1]);
1467
1468         regs = sunzilog_chip_regs[up[0].port.line / 2];
1469         of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
1470
1471         dev_set_drvdata(&op->dev, NULL);
1472
1473         return 0;
1474 }
1475
1476 static struct of_device_id zs_match[] = {
1477         {
1478                 .name = "zs",
1479         },
1480         {},
1481 };
1482 MODULE_DEVICE_TABLE(of, zs_match);
1483
1484 static struct of_platform_driver zs_driver = {
1485         .name           = "zs",
1486         .match_table    = zs_match,
1487         .probe          = zs_probe,
1488         .remove         = __devexit_p(zs_remove),
1489 };
1490
1491 static int __init sunzilog_init(void)
1492 {
1493         struct device_node *dp;
1494         int err, uart_count;
1495         int num_keybms;
1496         int num_sunzilog = 0;
1497
1498         num_keybms = 0;
1499         for_each_node_by_name(dp, "zs") {
1500                 num_sunzilog++;
1501                 if (of_find_property(dp, "keyboard", NULL))
1502                         num_keybms++;
1503         }
1504
1505         uart_count = 0;
1506         if (num_sunzilog) {
1507                 int uart_count;
1508
1509                 err = sunzilog_alloc_tables(num_sunzilog);
1510                 if (err)
1511                         goto out;
1512
1513                 uart_count = (num_sunzilog * 2) - (2 * num_keybms);
1514
1515                 err = sunserial_register_minors(&sunzilog_reg, uart_count);
1516                 if (err)
1517                         goto out_free_tables;
1518         }
1519
1520         err = of_register_driver(&zs_driver, &of_bus_type);
1521         if (err)
1522                 goto out_unregister_uart;
1523
1524         if (zilog_irq != -1) {
1525                 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1526                 err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
1527                                   "zs", sunzilog_irq_chain);
1528                 if (err)
1529                         goto out_unregister_driver;
1530
1531                 /* Enable Interrupts */
1532                 while (up) {
1533                         struct zilog_channel __iomem *channel;
1534
1535                         /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
1536                         channel          = ZILOG_CHANNEL_FROM_PORT(&up->port);
1537                         up->flags       |= SUNZILOG_FLAG_ISR_HANDLER;
1538                         up->curregs[R9] |= MIE;
1539                         write_zsreg(channel, R9, up->curregs[R9]);
1540                         up = up->next;
1541                 }
1542         }
1543
1544 out:
1545         return err;
1546
1547 out_unregister_driver:
1548         of_unregister_driver(&zs_driver);
1549
1550 out_unregister_uart:
1551         if (num_sunzilog) {
1552                 sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
1553                 sunzilog_reg.cons = NULL;
1554         }
1555
1556 out_free_tables:
1557         sunzilog_free_tables();
1558         goto out;
1559 }
1560
1561 static void __exit sunzilog_exit(void)
1562 {
1563         of_unregister_driver(&zs_driver);
1564
1565         if (zilog_irq != -1) {
1566                 struct uart_sunzilog_port *up = sunzilog_irq_chain;
1567
1568                 /* Disable Interrupts */
1569                 while (up) {
1570                         struct zilog_channel __iomem *channel;
1571
1572                         /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
1573                         channel          = ZILOG_CHANNEL_FROM_PORT(&up->port);
1574                         up->flags       &= ~SUNZILOG_FLAG_ISR_HANDLER;
1575                         up->curregs[R9] &= ~MIE;
1576                         write_zsreg(channel, R9, up->curregs[R9]);
1577                         up = up->next;
1578                 }
1579
1580                 free_irq(zilog_irq, sunzilog_irq_chain);
1581                 zilog_irq = -1;
1582         }
1583
1584         if (sunzilog_reg.nr) {
1585                 sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
1586                 sunzilog_free_tables();
1587         }
1588 }
1589
1590 module_init(sunzilog_init);
1591 module_exit(sunzilog_exit);
1592
1593 MODULE_AUTHOR("David S. Miller");
1594 MODULE_DESCRIPTION("Sun Zilog serial port driver");
1595 MODULE_VERSION("2.0");
1596 MODULE_LICENSE("GPL");