Automatic merge of rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...
[linux-2.6] / drivers / macintosh / via-pmu68k.c
1 /*
2  * Device driver for the PMU on 68K-based Apple PowerBooks
3  *
4  * The VIA (versatile interface adapter) interfaces to the PMU,
5  * a 6805 microprocessor core whose primary function is to control
6  * battery charging and system power on the PowerBooks.
7  * The PMU also controls the ADB (Apple Desktop Bus) which connects
8  * to the keyboard and mouse, as well as the non-volatile RAM
9  * and the RTC (real time clock) chip.
10  *
11  * Adapted for 68K PMU by Joshua M. Thompson
12  *
13  * Based largely on the PowerMac PMU code by Paul Mackerras and
14  * Fabio Riccardi.
15  *
16  * Also based on the PMU driver from MkLinux by Apple Computer, Inc.
17  * and the Open Software Foundation, Inc.
18  */
19
20 #include <stdarg.h>
21 #include <linux/types.h>
22 #include <linux/errno.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/sched.h>
26 #include <linux/miscdevice.h>
27 #include <linux/blkdev.h>
28 #include <linux/pci.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/interrupt.h>
32
33 #include <linux/adb.h>
34 #include <linux/pmu.h>
35 #include <linux/cuda.h>
36
37 #include <asm/macintosh.h>
38 #include <asm/macints.h>
39 #include <asm/machw.h>
40 #include <asm/mac_via.h>
41
42 #include <asm/pgtable.h>
43 #include <asm/system.h>
44 #include <asm/irq.h>
45 #include <asm/uaccess.h>
46
47 /* Misc minor number allocated for /dev/pmu */
48 #define PMU_MINOR       154
49
50 /* VIA registers - spaced 0x200 bytes apart */
51 #define RS              0x200           /* skip between registers */
52 #define B               0               /* B-side data */
53 #define A               RS              /* A-side data */
54 #define DIRB            (2*RS)          /* B-side direction (1=output) */
55 #define DIRA            (3*RS)          /* A-side direction (1=output) */
56 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
57 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
58 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
59 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
60 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
61 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
62 #define SR              (10*RS)         /* Shift register */
63 #define ACR             (11*RS)         /* Auxiliary control register */
64 #define PCR             (12*RS)         /* Peripheral control register */
65 #define IFR             (13*RS)         /* Interrupt flag register */
66 #define IER             (14*RS)         /* Interrupt enable register */
67 #define ANH             (15*RS)         /* A-side data, no handshake */
68
69 /* Bits in B data register: both active low */
70 #define TACK            0x02            /* Transfer acknowledge (input) */
71 #define TREQ            0x04            /* Transfer request (output) */
72
73 /* Bits in ACR */
74 #define SR_CTRL         0x1c            /* Shift register control bits */
75 #define SR_EXT          0x0c            /* Shift on external clock */
76 #define SR_OUT          0x10            /* Shift out if 1 */
77
78 /* Bits in IFR and IER */
79 #define SR_INT          0x04            /* Shift register full/empty */
80 #define CB1_INT         0x10            /* transition on CB1 input */
81
82 static enum pmu_state {
83         idle,
84         sending,
85         intack,
86         reading,
87         reading_intr,
88 } pmu_state;
89
90 static struct adb_request *current_req;
91 static struct adb_request *last_req;
92 static struct adb_request *req_awaiting_reply;
93 static unsigned char interrupt_data[32];
94 static unsigned char *reply_ptr;
95 static int data_index;
96 static int data_len;
97 static int adb_int_pending;
98 static int pmu_adb_flags;
99 static int adb_dev_map = 0;
100 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
101 static int pmu_kind = PMU_UNKNOWN;
102 static int pmu_fully_inited = 0;
103
104 int asleep;
105 struct notifier_block *sleep_notifier_list;
106
107 static int pmu_probe(void);
108 static int pmu_init(void);
109 static void pmu_start(void);
110 static irqreturn_t pmu_interrupt(int irq, void *arg, struct pt_regs *regs);
111 static int pmu_send_request(struct adb_request *req, int sync);
112 static int pmu_autopoll(int devs);
113 void pmu_poll(void);
114 static int pmu_reset_bus(void);
115 static int pmu_queue_request(struct adb_request *req);
116
117 static void pmu_start(void);
118 static void send_byte(int x);
119 static void recv_byte(void);
120 static void pmu_done(struct adb_request *req);
121 static void pmu_handle_data(unsigned char *data, int len,
122                             struct pt_regs *regs);
123 static void set_volume(int level);
124 static void pmu_enable_backlight(int on);
125 static void pmu_set_brightness(int level);
126
127 struct adb_driver via_pmu_driver = {
128         "68K PMU",
129         pmu_probe,
130         pmu_init,
131         pmu_send_request,
132         pmu_autopoll,
133         pmu_poll,
134         pmu_reset_bus
135 };
136
137 /*
138  * This table indicates for each PMU opcode:
139  * - the number of data bytes to be sent with the command, or -1
140  *   if a length byte should be sent,
141  * - the number of response bytes which the PMU will return, or
142  *   -1 if it will send a length byte.
143  */
144 static s8 pmu_data_len[256][2] = {
145 /*         0       1       2       3       4       5       6       7  */
146 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
147 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
148 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
149 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
150 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
151 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
152 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
153 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
154 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
155 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
156 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
157 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
158 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
159 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
160 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
161 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
162 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
163 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
164 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
165 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
166 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
167 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
168 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
169 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
170 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
171 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
172 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
173 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
174 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
175 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
176 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
177 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
178 };
179
180 int pmu_probe(void)
181 {
182         if (macintosh_config->adb_type == MAC_ADB_PB1) {
183                 pmu_kind = PMU_68K_V1;
184         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
185                 pmu_kind = PMU_68K_V2;
186         } else {
187                 return -ENODEV;
188         }
189
190         pmu_state = idle;
191
192         return 0;
193 }
194
195 static int 
196 pmu_init(void)
197 {
198         int timeout;
199         volatile struct adb_request req;
200
201         via2[B] |= TREQ;                                /* negate TREQ */
202         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
203
204         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
205         timeout =  100000;
206         while (!req.complete) {
207                 if (--timeout < 0) {
208                         printk(KERN_ERR "pmu_init: no response from PMU\n");
209                         return -EAGAIN;
210                 }
211                 udelay(10);
212                 pmu_poll();
213         }
214
215         /* ack all pending interrupts */
216         timeout = 100000;
217         interrupt_data[0] = 1;
218         while (interrupt_data[0] || pmu_state != idle) {
219                 if (--timeout < 0) {
220                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
221                         return -EAGAIN;
222                 }
223                 if (pmu_state == idle) {
224                         adb_int_pending = 1;
225                         pmu_interrupt(0, NULL, NULL);
226                 }
227                 pmu_poll();
228                 udelay(10);
229         }
230
231         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
232                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
233         timeout =  100000;
234         while (!req.complete) {
235                 if (--timeout < 0) {
236                         printk(KERN_ERR "pmu_init: no response from PMU\n");
237                         return -EAGAIN;
238                 }
239                 udelay(10);
240                 pmu_poll();
241         }
242
243         bright_req_1.complete = 1;
244         bright_req_2.complete = 1;
245         bright_req_3.complete = 1;
246
247         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
248                         pmu_interrupt)) {
249                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
250                         IRQ_MAC_ADB_SR);
251                 return -EAGAIN;
252         }
253         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
254                         pmu_interrupt)) {
255                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
256                         IRQ_MAC_ADB_CL);
257                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
258                 return -EAGAIN;
259         }
260
261         pmu_fully_inited = 1;
262         
263         /* Enable backlight */
264         pmu_enable_backlight(1);
265
266         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
267
268         return 0;
269 }
270
271 int
272 pmu_get_model(void)
273 {
274         return pmu_kind;
275 }
276
277 /* Send an ADB command */
278 static int 
279 pmu_send_request(struct adb_request *req, int sync)
280 {
281     int i, ret;
282
283     if (!pmu_fully_inited)
284     {
285         req->complete = 1;
286         return -ENXIO;
287    }
288
289     ret = -EINVAL;
290         
291     switch (req->data[0]) {
292     case PMU_PACKET:
293                 for (i = 0; i < req->nbytes - 1; ++i)
294                         req->data[i] = req->data[i+1];
295                 --req->nbytes;
296                 if (pmu_data_len[req->data[0]][1] != 0) {
297                         req->reply[0] = ADB_RET_OK;
298                         req->reply_len = 1;
299                 } else
300                         req->reply_len = 0;
301                 ret = pmu_queue_request(req);
302                 break;
303     case CUDA_PACKET:
304                 switch (req->data[1]) {
305                 case CUDA_GET_TIME:
306                         if (req->nbytes != 2)
307                                 break;
308                         req->data[0] = PMU_READ_RTC;
309                         req->nbytes = 1;
310                         req->reply_len = 3;
311                         req->reply[0] = CUDA_PACKET;
312                         req->reply[1] = 0;
313                         req->reply[2] = CUDA_GET_TIME;
314                         ret = pmu_queue_request(req);
315                         break;
316                 case CUDA_SET_TIME:
317                         if (req->nbytes != 6)
318                                 break;
319                         req->data[0] = PMU_SET_RTC;
320                         req->nbytes = 5;
321                         for (i = 1; i <= 4; ++i)
322                                 req->data[i] = req->data[i+1];
323                         req->reply_len = 3;
324                         req->reply[0] = CUDA_PACKET;
325                         req->reply[1] = 0;
326                         req->reply[2] = CUDA_SET_TIME;
327                         ret = pmu_queue_request(req);
328                         break;
329                 case CUDA_GET_PRAM:
330                         if (req->nbytes != 4)
331                                 break;
332                         req->data[0] = PMU_READ_NVRAM;
333                         req->data[1] = req->data[2];
334                         req->data[2] = req->data[3];
335                         req->nbytes = 3;
336                         req->reply_len = 3;
337                         req->reply[0] = CUDA_PACKET;
338                         req->reply[1] = 0;
339                         req->reply[2] = CUDA_GET_PRAM;
340                         ret = pmu_queue_request(req);
341                         break;
342                 case CUDA_SET_PRAM:
343                         if (req->nbytes != 5)
344                                 break;
345                         req->data[0] = PMU_WRITE_NVRAM;
346                         req->data[1] = req->data[2];
347                         req->data[2] = req->data[3];
348                         req->data[3] = req->data[4];
349                         req->nbytes = 4;
350                         req->reply_len = 3;
351                         req->reply[0] = CUDA_PACKET;
352                         req->reply[1] = 0;
353                         req->reply[2] = CUDA_SET_PRAM;
354                         ret = pmu_queue_request(req);
355                         break;
356                 }
357                 break;
358     case ADB_PACKET:
359                 for (i = req->nbytes - 1; i > 1; --i)
360                         req->data[i+2] = req->data[i];
361                 req->data[3] = req->nbytes - 2;
362                 req->data[2] = pmu_adb_flags;
363                 /*req->data[1] = req->data[1];*/
364                 req->data[0] = PMU_ADB_CMD;
365                 req->nbytes += 2;
366                 req->reply_expected = 1;
367                 req->reply_len = 0;
368                 ret = pmu_queue_request(req);
369                 break;
370     }
371     if (ret)
372     {
373         req->complete = 1;
374         return ret;
375     }
376         
377     if (sync) {
378         while (!req->complete)
379                 pmu_poll();
380     }
381
382     return 0;
383 }
384
385 /* Enable/disable autopolling */
386 static int 
387 pmu_autopoll(int devs)
388 {
389         struct adb_request req;
390
391         if (!pmu_fully_inited) return -ENXIO;
392
393         if (devs) {
394                 adb_dev_map = devs;
395                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
396                             adb_dev_map >> 8, adb_dev_map);
397                 pmu_adb_flags = 2;
398         } else {
399                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
400                 pmu_adb_flags = 0;
401         }
402         while (!req.complete)
403                 pmu_poll();
404         return 0;
405 }
406
407 /* Reset the ADB bus */
408 static int 
409 pmu_reset_bus(void)
410 {
411         struct adb_request req;
412         long timeout;
413         int save_autopoll = adb_dev_map;
414
415         if (!pmu_fully_inited) return -ENXIO;
416
417         /* anyone got a better idea?? */
418         pmu_autopoll(0);
419
420         req.nbytes = 5;
421         req.done = NULL;
422         req.data[0] = PMU_ADB_CMD;
423         req.data[1] = 0;
424         req.data[2] = 3; /* ADB_BUSRESET ??? */
425         req.data[3] = 0;
426         req.data[4] = 0;
427         req.reply_len = 0;
428         req.reply_expected = 1;
429         if (pmu_queue_request(&req) != 0)
430         {
431                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
432                 return -EIO;
433         }
434         while (!req.complete)
435                 pmu_poll();
436         timeout = 100000;
437         while (!req.complete) {
438                 if (--timeout < 0) {
439                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
440                         return -EIO;
441                 }
442                 udelay(10);
443                 pmu_poll();
444         }
445
446         if (save_autopoll != 0)
447                 pmu_autopoll(save_autopoll);
448                 
449         return 0;
450 }
451
452 /* Construct and send a pmu request */
453 int 
454 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
455             int nbytes, ...)
456 {
457         va_list list;
458         int i;
459
460         if (nbytes < 0 || nbytes > 32) {
461                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
462                 req->complete = 1;
463                 return -EINVAL;
464         }
465         req->nbytes = nbytes;
466         req->done = done;
467         va_start(list, nbytes);
468         for (i = 0; i < nbytes; ++i)
469                 req->data[i] = va_arg(list, int);
470         va_end(list);
471         if (pmu_data_len[req->data[0]][1] != 0) {
472                 req->reply[0] = ADB_RET_OK;
473                 req->reply_len = 1;
474         } else
475                 req->reply_len = 0;
476         req->reply_expected = 0;
477         return pmu_queue_request(req);
478 }
479
480 static int 
481 pmu_queue_request(struct adb_request *req)
482 {
483         unsigned long flags;
484         int nsend;
485
486         if (req->nbytes <= 0) {
487                 req->complete = 1;
488                 return 0;
489         }
490         nsend = pmu_data_len[req->data[0]][0];
491         if (nsend >= 0 && req->nbytes != nsend + 1) {
492                 req->complete = 1;
493                 return -EINVAL;
494         }
495
496         req->next = 0;
497         req->sent = 0;
498         req->complete = 0;
499         local_irq_save(flags);
500
501         if (current_req != 0) {
502                 last_req->next = req;
503                 last_req = req;
504         } else {
505                 current_req = req;
506                 last_req = req;
507                 if (pmu_state == idle)
508                         pmu_start();
509         }
510
511         local_irq_restore(flags);
512         return 0;
513 }
514
515 static void 
516 send_byte(int x)
517 {
518         via1[ACR] |= SR_CTRL;
519         via1[SR] = x;
520         via2[B] &= ~TREQ;               /* assert TREQ */
521 }
522
523 static void 
524 recv_byte(void)
525 {
526         char c;
527
528         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
529         c = via1[SR];           /* resets SR */
530         via2[B] &= ~TREQ;
531 }
532
533 static void 
534 pmu_start(void)
535 {
536         unsigned long flags;
537         struct adb_request *req;
538
539         /* assert pmu_state == idle */
540         /* get the packet to send */
541         local_irq_save(flags);
542         req = current_req;
543         if (req == 0 || pmu_state != idle
544             || (req->reply_expected && req_awaiting_reply))
545                 goto out;
546
547         pmu_state = sending;
548         data_index = 1;
549         data_len = pmu_data_len[req->data[0]][0];
550
551         /* set the shift register to shift out and send a byte */
552         send_byte(req->data[0]);
553
554 out:
555         local_irq_restore(flags);
556 }
557
558 void 
559 pmu_poll(void)
560 {
561         unsigned long flags;
562
563         local_irq_save(flags);
564         if (via1[IFR] & SR_INT) {
565                 via1[IFR] = SR_INT;
566                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL, NULL);
567         }
568         if (via1[IFR] & CB1_INT) {
569                 via1[IFR] = CB1_INT;
570                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL, NULL);
571         }
572         local_irq_restore(flags);
573 }
574
575 static irqreturn_t
576 pmu_interrupt(int irq, void *dev_id, struct pt_regs *regs)
577 {
578         struct adb_request *req;
579         int timeout, bite = 0;  /* to prevent compiler warning */
580
581 #if 0
582         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
583                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
584 #endif
585
586         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
587                 adb_int_pending = 1;
588         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
589                 if (via2[B] & TACK) {
590                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
591                 }
592
593                 /* if reading grab the byte */
594                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
595
596                 /* reset TREQ and wait for TACK to go high */
597                 via2[B] |= TREQ;
598                 timeout = 3200;
599                 while (!(via2[B] & TACK)) {
600                         if (--timeout < 0) {
601                                 printk(KERN_ERR "PMU not responding (!ack)\n");
602                                 goto finish;
603                         }
604                         udelay(10);
605                 }
606
607                 switch (pmu_state) {
608                 case sending:
609                         req = current_req;
610                         if (data_len < 0) {
611                                 data_len = req->nbytes - 1;
612                                 send_byte(data_len);
613                                 break;
614                         }
615                         if (data_index <= data_len) {
616                                 send_byte(req->data[data_index++]);
617                                 break;
618                         }
619                         req->sent = 1;
620                         data_len = pmu_data_len[req->data[0]][1];
621                         if (data_len == 0) {
622                                 pmu_state = idle;
623                                 current_req = req->next;
624                                 if (req->reply_expected)
625                                         req_awaiting_reply = req;
626                                 else
627                                         pmu_done(req);
628                         } else {
629                                 pmu_state = reading;
630                                 data_index = 0;
631                                 reply_ptr = req->reply + req->reply_len;
632                                 recv_byte();
633                         }
634                         break;
635
636                 case intack:
637                         data_index = 0;
638                         data_len = -1;
639                         pmu_state = reading_intr;
640                         reply_ptr = interrupt_data;
641                         recv_byte();
642                         break;
643
644                 case reading:
645                 case reading_intr:
646                         if (data_len == -1) {
647                                 data_len = bite;
648                                 if (bite > 32)
649                                         printk(KERN_ERR "PMU: bad reply len %d\n",
650                                                bite);
651                         } else {
652                                 reply_ptr[data_index++] = bite;
653                         }
654                         if (data_index < data_len) {
655                                 recv_byte();
656                                 break;
657                         }
658
659                         if (pmu_state == reading_intr) {
660                                 pmu_handle_data(interrupt_data, data_index, regs);
661                         } else {
662                                 req = current_req;
663                                 current_req = req->next;
664                                 req->reply_len += data_index;
665                                 pmu_done(req);
666                         }
667                         pmu_state = idle;
668
669                         break;
670
671                 default:
672                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
673                                pmu_state);
674                 }
675         }
676 finish:
677         if (pmu_state == idle) {
678                 if (adb_int_pending) {
679                         pmu_state = intack;
680                         send_byte(PMU_INT_ACK);
681                         adb_int_pending = 0;
682                 } else if (current_req) {
683                         pmu_start();
684                 }
685         }
686
687 #if 0
688         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
689                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
690 #endif
691         return IRQ_HANDLED;
692 }
693
694 static void 
695 pmu_done(struct adb_request *req)
696 {
697         req->complete = 1;
698         if (req->done)
699                 (*req->done)(req);
700 }
701
702 /* Interrupt data could be the result data from an ADB cmd */
703 static void 
704 pmu_handle_data(unsigned char *data, int len, struct pt_regs *regs)
705 {
706         static int show_pmu_ints = 1;
707
708         asleep = 0;
709         if (len < 1) {
710                 adb_int_pending = 0;
711                 return;
712         }
713         if (data[0] & PMU_INT_ADB) {
714                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
715                         struct adb_request *req = req_awaiting_reply;
716                         if (req == 0) {
717                                 printk(KERN_ERR "PMU: extra ADB reply\n");
718                                 return;
719                         }
720                         req_awaiting_reply = 0;
721                         if (len <= 2)
722                                 req->reply_len = 0;
723                         else {
724                                 memcpy(req->reply, data + 1, len - 1);
725                                 req->reply_len = len - 1;
726                         }
727                         pmu_done(req);
728                 } else {
729                         adb_input(data+1, len-1, regs, 1);
730                 }
731         } else {
732                 if (data[0] == 0x08 && len == 3) {
733                         /* sound/brightness buttons pressed */
734                         pmu_set_brightness(data[1] >> 3);
735                         set_volume(data[2]);
736                 } else if (show_pmu_ints
737                            && !(data[0] == PMU_INT_TICK && len == 1)) {
738                         int i;
739                         printk(KERN_DEBUG "pmu intr");
740                         for (i = 0; i < len; ++i)
741                                 printk(" %.2x", data[i]);
742                         printk("\n");
743                 }
744         }
745 }
746
747 int backlight_level = -1;
748 int backlight_enabled = 0;
749
750 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
751
752 static void 
753 pmu_enable_backlight(int on)
754 {
755         struct adb_request req;
756
757         if (on) {
758             /* first call: get current backlight value */
759             if (backlight_level < 0) {
760                 switch(pmu_kind) {
761                     case PMU_68K_V1:
762                     case PMU_68K_V2:
763                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
764                         while (!req.complete)
765                                 pmu_poll();
766                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
767                         backlight_level = req.reply[1];
768                         break;
769                     default:
770                         backlight_enabled = 0;
771                         return;
772                 }
773             }
774             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
775                 LEVEL_TO_BRIGHT(backlight_level));
776             while (!req.complete)
777                 pmu_poll();
778         }
779         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
780             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
781         while (!req.complete)
782                 pmu_poll();
783         backlight_enabled = on;
784 }
785
786 static void 
787 pmu_set_brightness(int level)
788 {
789         int bright;
790
791         backlight_level = level;
792         bright = LEVEL_TO_BRIGHT(level);
793         if (!backlight_enabled)
794                 return;
795         if (bright_req_1.complete)
796                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
797                     bright);
798         if (bright_req_2.complete)
799                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
800                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
801 }
802
803 void 
804 pmu_enable_irled(int on)
805 {
806         struct adb_request req;
807
808         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
809             (on ? PMU_POW_ON : PMU_POW_OFF));
810         while (!req.complete)
811                 pmu_poll();
812 }
813
814 static void 
815 set_volume(int level)
816 {
817 }
818
819 int
820 pmu_present(void)
821 {
822         return (pmu_kind != PMU_UNKNOWN);
823 }
824
825 #if 0 /* needs some work for 68K */
826
827 /*
828  * This struct is used to store config register values for
829  * PCI devices which may get powered off when we sleep.
830  */
831 static struct pci_save {
832         u16     command;
833         u16     cache_lat;
834         u16     intr;
835 } *pbook_pci_saves;
836 static int n_pbook_pci_saves;
837
838 static inline void __openfirmware
839 pbook_pci_save(void)
840 {
841         int npci;
842         struct pci_dev *pd = NULL;
843         struct pci_save *ps;
844
845         npci = 0;
846         while ((pd = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL)
847                 ++npci;
848         n_pbook_pci_saves = npci;
849         if (npci == 0)
850                 return;
851         ps = (struct pci_save *) kmalloc(npci * sizeof(*ps), GFP_KERNEL);
852         pbook_pci_saves = ps;
853         if (ps == NULL)
854                 return;
855
856         pd = NULL;
857         while ((pd = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
858                 pci_read_config_word(pd, PCI_COMMAND, &ps->command);
859                 pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
860                 pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
861                 ++ps;
862                 --npci;
863         }
864 }
865
866 static inline void __openfirmware
867 pbook_pci_restore(void)
868 {
869         u16 cmd;
870         struct pci_save *ps = pbook_pci_saves;
871         struct pci_dev *pd = NULL;
872         int j;
873
874         while ((pd = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
875                 if (ps->command == 0)
876                         continue;
877                 pci_read_config_word(pd, PCI_COMMAND, &cmd);
878                 if ((ps->command & ~cmd) == 0)
879                         continue;
880                 switch (pd->hdr_type) {
881                 case PCI_HEADER_TYPE_NORMAL:
882                         for (j = 0; j < 6; ++j)
883                                 pci_write_config_dword(pd,
884                                         PCI_BASE_ADDRESS_0 + j*4,
885                                         pd->resource[j].start);
886                         pci_write_config_dword(pd, PCI_ROM_ADDRESS,
887                                pd->resource[PCI_ROM_RESOURCE].start);
888                         pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
889                                 ps->cache_lat);
890                         pci_write_config_word(pd, PCI_INTERRUPT_LINE,
891                                 ps->intr);
892                         pci_write_config_word(pd, PCI_COMMAND, ps->command);
893                         break;
894                         /* other header types not restored at present */
895                 }
896         }
897 }
898
899 /*
900  * Put the powerbook to sleep.
901  */
902 #define IRQ_ENABLE      ((unsigned int *)0xf3000024)
903 #define MEM_CTRL        ((unsigned int *)0xf8000070)
904
905 int __openfirmware powerbook_sleep(void)
906 {
907         int ret, i, x;
908         static int save_backlight;
909         static unsigned int save_irqen;
910         unsigned long msr;
911         unsigned int hid0;
912         unsigned long p, wait;
913         struct adb_request sleep_req;
914
915         /* Notify device drivers */
916         ret = notifier_call_chain(&sleep_notifier_list, PBOOK_SLEEP, NULL);
917         if (ret & NOTIFY_STOP_MASK)
918                 return -EBUSY;
919
920         /* Sync the disks. */
921         /* XXX It would be nice to have some way to ensure that
922          * nobody is dirtying any new buffers while we wait. */
923         sys_sync();
924
925         /* Turn off the display backlight */
926         save_backlight = backlight_enabled;
927         if (save_backlight)
928                 pmu_enable_backlight(0);
929
930         /* Give the disks a little time to actually finish writing */
931         for (wait = jiffies + (HZ/4); time_before(jiffies, wait); )
932                 mb();
933
934         /* Disable all interrupts except pmu */
935         save_irqen = in_le32(IRQ_ENABLE);
936         for (i = 0; i < 32; ++i)
937                 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
938                         disable_irq(i);
939         asm volatile("mtdec %0" : : "r" (0x7fffffff));
940
941         /* Save the state of PCI config space for some slots */
942         pbook_pci_save();
943
944         /* Set the memory controller to keep the memory refreshed
945            while we're asleep */
946         for (i = 0x403f; i >= 0x4000; --i) {
947                 out_be32(MEM_CTRL, i);
948                 do {
949                         x = (in_be32(MEM_CTRL) >> 16) & 0x3ff;
950                 } while (x == 0);
951                 if (x >= 0x100)
952                         break;
953         }
954
955         /* Ask the PMU to put us to sleep */
956         pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
957         while (!sleep_req.complete)
958                 mb();
959         /* displacement-flush the L2 cache - necessary? */
960         for (p = KERNELBASE; p < KERNELBASE + 0x100000; p += 0x1000)
961                 i = *(volatile int *)p;
962         asleep = 1;
963
964         /* Put the CPU into sleep mode */
965         asm volatile("mfspr %0,1008" : "=r" (hid0) :);
966         hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
967         asm volatile("mtspr 1008,%0" : : "r" (hid0));
968         local_save_flags(msr);
969         msr |= MSR_POW | MSR_EE;
970         local_irq_restore(msr);
971         udelay(10);
972
973         /* OK, we're awake again, start restoring things */
974         out_be32(MEM_CTRL, 0x3f);
975         pbook_pci_restore();
976
977         /* wait for the PMU interrupt sequence to complete */
978         while (asleep)
979                 mb();
980
981         /* reenable interrupts */
982         for (i = 0; i < 32; ++i)
983                 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
984                         enable_irq(i);
985
986         /* Notify drivers */
987         notifier_call_chain(&sleep_notifier_list, PBOOK_WAKE, NULL);
988
989         /* reenable ADB autopoll */
990         pmu_adb_autopoll(adb_dev_map);
991
992         /* Turn on the screen backlight, if it was on before */
993         if (save_backlight)
994                 pmu_enable_backlight(1);
995
996         /* Wait for the hard disk to spin up */
997
998         return 0;
999 }
1000
1001 /*
1002  * Support for /dev/pmu device
1003  */
1004 static int __openfirmware pmu_open(struct inode *inode, struct file *file)
1005 {
1006         return 0;
1007 }
1008
1009 static ssize_t __openfirmware pmu_read(struct file *file, char *buf,
1010                         size_t count, loff_t *ppos)
1011 {
1012         return 0;
1013 }
1014
1015 static ssize_t __openfirmware pmu_write(struct file *file, const char *buf,
1016                          size_t count, loff_t *ppos)
1017 {
1018         return 0;
1019 }
1020
1021 /* Note: removed __openfirmware here since it causes link errors */
1022 static int /*__openfirmware*/ pmu_ioctl(struct inode * inode, struct file *filp,
1023                      u_int cmd, u_long arg)
1024 {
1025         int error;
1026         __u32 value;
1027
1028         switch (cmd) {
1029             case PMU_IOC_SLEEP:
1030                 return -ENOSYS;
1031             case PMU_IOC_GET_BACKLIGHT:
1032                 return put_user(backlight_level, (__u32 *)arg);
1033             case PMU_IOC_SET_BACKLIGHT:
1034                 error = get_user(value, (__u32 *)arg);
1035                 if (!error)
1036                         pmu_set_brightness(value);
1037                 return error;
1038             case PMU_IOC_GET_MODEL:
1039                 return put_user(pmu_kind, (__u32 *)arg);
1040         }
1041         return -EINVAL;
1042 }
1043
1044 static struct file_operations pmu_device_fops = {
1045         .read           = pmu_read,
1046         .write          = pmu_write,
1047         .ioctl          = pmu_ioctl,
1048         .open           = pmu_open,
1049 };
1050
1051 static struct miscdevice pmu_device = {
1052         PMU_MINOR, "pmu", &pmu_device_fops
1053 };
1054
1055 void pmu_device_init(void)
1056 {
1057         if (!via)
1058                 return;
1059         if (misc_register(&pmu_device) < 0)
1060                 printk(KERN_ERR "via-pmu68k: cannot register misc device.\n");
1061 }
1062 #endif /* CONFIG_PMAC_PBOOK */
1063