drm: fix up irqflags in drm_lock.c
[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 BLOCKING_NOTIFIER_HEAD(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);
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 static void set_volume(int level);
123 static void pmu_enable_backlight(int on);
124 static void pmu_set_brightness(int level);
125
126 struct adb_driver via_pmu_driver = {
127         "68K PMU",
128         pmu_probe,
129         pmu_init,
130         pmu_send_request,
131         pmu_autopoll,
132         pmu_poll,
133         pmu_reset_bus
134 };
135
136 /*
137  * This table indicates for each PMU opcode:
138  * - the number of data bytes to be sent with the command, or -1
139  *   if a length byte should be sent,
140  * - the number of response bytes which the PMU will return, or
141  *   -1 if it will send a length byte.
142  */
143 static s8 pmu_data_len[256][2] = {
144 /*         0       1       2       3       4       5       6       7  */
145 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
146 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
147 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
148 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
149 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
150 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
151 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
152 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
153 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
154 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
155 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
156 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
157 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
158 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
159 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
160 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
161 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
162 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
163 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
164 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
165 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
166 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
167 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
168 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
169 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
170 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
171 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
172 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
173 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
174 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
175 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
176 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
177 };
178
179 int pmu_probe(void)
180 {
181         if (macintosh_config->adb_type == MAC_ADB_PB1) {
182                 pmu_kind = PMU_68K_V1;
183         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
184                 pmu_kind = PMU_68K_V2;
185         } else {
186                 return -ENODEV;
187         }
188
189         pmu_state = idle;
190
191         return 0;
192 }
193
194 static int 
195 pmu_init(void)
196 {
197         int timeout;
198         volatile struct adb_request req;
199
200         via2[B] |= TREQ;                                /* negate TREQ */
201         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
202
203         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
204         timeout =  100000;
205         while (!req.complete) {
206                 if (--timeout < 0) {
207                         printk(KERN_ERR "pmu_init: no response from PMU\n");
208                         return -EAGAIN;
209                 }
210                 udelay(10);
211                 pmu_poll();
212         }
213
214         /* ack all pending interrupts */
215         timeout = 100000;
216         interrupt_data[0] = 1;
217         while (interrupt_data[0] || pmu_state != idle) {
218                 if (--timeout < 0) {
219                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
220                         return -EAGAIN;
221                 }
222                 if (pmu_state == idle) {
223                         adb_int_pending = 1;
224                         pmu_interrupt(0, NULL);
225                 }
226                 pmu_poll();
227                 udelay(10);
228         }
229
230         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
231                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
232         timeout =  100000;
233         while (!req.complete) {
234                 if (--timeout < 0) {
235                         printk(KERN_ERR "pmu_init: no response from PMU\n");
236                         return -EAGAIN;
237                 }
238                 udelay(10);
239                 pmu_poll();
240         }
241
242         bright_req_1.complete = 1;
243         bright_req_2.complete = 1;
244         bright_req_3.complete = 1;
245
246         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
247                         pmu_interrupt)) {
248                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
249                         IRQ_MAC_ADB_SR);
250                 return -EAGAIN;
251         }
252         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
253                         pmu_interrupt)) {
254                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
255                         IRQ_MAC_ADB_CL);
256                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
257                 return -EAGAIN;
258         }
259
260         pmu_fully_inited = 1;
261         
262         /* Enable backlight */
263         pmu_enable_backlight(1);
264
265         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
266
267         return 0;
268 }
269
270 int
271 pmu_get_model(void)
272 {
273         return pmu_kind;
274 }
275
276 /* Send an ADB command */
277 static int 
278 pmu_send_request(struct adb_request *req, int sync)
279 {
280     int i, ret;
281
282     if (!pmu_fully_inited)
283     {
284         req->complete = 1;
285         return -ENXIO;
286    }
287
288     ret = -EINVAL;
289         
290     switch (req->data[0]) {
291     case PMU_PACKET:
292                 for (i = 0; i < req->nbytes - 1; ++i)
293                         req->data[i] = req->data[i+1];
294                 --req->nbytes;
295                 if (pmu_data_len[req->data[0]][1] != 0) {
296                         req->reply[0] = ADB_RET_OK;
297                         req->reply_len = 1;
298                 } else
299                         req->reply_len = 0;
300                 ret = pmu_queue_request(req);
301                 break;
302     case CUDA_PACKET:
303                 switch (req->data[1]) {
304                 case CUDA_GET_TIME:
305                         if (req->nbytes != 2)
306                                 break;
307                         req->data[0] = PMU_READ_RTC;
308                         req->nbytes = 1;
309                         req->reply_len = 3;
310                         req->reply[0] = CUDA_PACKET;
311                         req->reply[1] = 0;
312                         req->reply[2] = CUDA_GET_TIME;
313                         ret = pmu_queue_request(req);
314                         break;
315                 case CUDA_SET_TIME:
316                         if (req->nbytes != 6)
317                                 break;
318                         req->data[0] = PMU_SET_RTC;
319                         req->nbytes = 5;
320                         for (i = 1; i <= 4; ++i)
321                                 req->data[i] = req->data[i+1];
322                         req->reply_len = 3;
323                         req->reply[0] = CUDA_PACKET;
324                         req->reply[1] = 0;
325                         req->reply[2] = CUDA_SET_TIME;
326                         ret = pmu_queue_request(req);
327                         break;
328                 case CUDA_GET_PRAM:
329                         if (req->nbytes != 4)
330                                 break;
331                         req->data[0] = PMU_READ_NVRAM;
332                         req->data[1] = req->data[2];
333                         req->data[2] = req->data[3];
334                         req->nbytes = 3;
335                         req->reply_len = 3;
336                         req->reply[0] = CUDA_PACKET;
337                         req->reply[1] = 0;
338                         req->reply[2] = CUDA_GET_PRAM;
339                         ret = pmu_queue_request(req);
340                         break;
341                 case CUDA_SET_PRAM:
342                         if (req->nbytes != 5)
343                                 break;
344                         req->data[0] = PMU_WRITE_NVRAM;
345                         req->data[1] = req->data[2];
346                         req->data[2] = req->data[3];
347                         req->data[3] = req->data[4];
348                         req->nbytes = 4;
349                         req->reply_len = 3;
350                         req->reply[0] = CUDA_PACKET;
351                         req->reply[1] = 0;
352                         req->reply[2] = CUDA_SET_PRAM;
353                         ret = pmu_queue_request(req);
354                         break;
355                 }
356                 break;
357     case ADB_PACKET:
358                 for (i = req->nbytes - 1; i > 1; --i)
359                         req->data[i+2] = req->data[i];
360                 req->data[3] = req->nbytes - 2;
361                 req->data[2] = pmu_adb_flags;
362                 /*req->data[1] = req->data[1];*/
363                 req->data[0] = PMU_ADB_CMD;
364                 req->nbytes += 2;
365                 req->reply_expected = 1;
366                 req->reply_len = 0;
367                 ret = pmu_queue_request(req);
368                 break;
369     }
370     if (ret)
371     {
372         req->complete = 1;
373         return ret;
374     }
375         
376     if (sync) {
377         while (!req->complete)
378                 pmu_poll();
379     }
380
381     return 0;
382 }
383
384 /* Enable/disable autopolling */
385 static int 
386 pmu_autopoll(int devs)
387 {
388         struct adb_request req;
389
390         if (!pmu_fully_inited) return -ENXIO;
391
392         if (devs) {
393                 adb_dev_map = devs;
394                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
395                             adb_dev_map >> 8, adb_dev_map);
396                 pmu_adb_flags = 2;
397         } else {
398                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
399                 pmu_adb_flags = 0;
400         }
401         while (!req.complete)
402                 pmu_poll();
403         return 0;
404 }
405
406 /* Reset the ADB bus */
407 static int 
408 pmu_reset_bus(void)
409 {
410         struct adb_request req;
411         long timeout;
412         int save_autopoll = adb_dev_map;
413
414         if (!pmu_fully_inited) return -ENXIO;
415
416         /* anyone got a better idea?? */
417         pmu_autopoll(0);
418
419         req.nbytes = 5;
420         req.done = NULL;
421         req.data[0] = PMU_ADB_CMD;
422         req.data[1] = 0;
423         req.data[2] = 3; /* ADB_BUSRESET ??? */
424         req.data[3] = 0;
425         req.data[4] = 0;
426         req.reply_len = 0;
427         req.reply_expected = 1;
428         if (pmu_queue_request(&req) != 0)
429         {
430                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
431                 return -EIO;
432         }
433         while (!req.complete)
434                 pmu_poll();
435         timeout = 100000;
436         while (!req.complete) {
437                 if (--timeout < 0) {
438                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
439                         return -EIO;
440                 }
441                 udelay(10);
442                 pmu_poll();
443         }
444
445         if (save_autopoll != 0)
446                 pmu_autopoll(save_autopoll);
447                 
448         return 0;
449 }
450
451 /* Construct and send a pmu request */
452 int 
453 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
454             int nbytes, ...)
455 {
456         va_list list;
457         int i;
458
459         if (nbytes < 0 || nbytes > 32) {
460                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
461                 req->complete = 1;
462                 return -EINVAL;
463         }
464         req->nbytes = nbytes;
465         req->done = done;
466         va_start(list, nbytes);
467         for (i = 0; i < nbytes; ++i)
468                 req->data[i] = va_arg(list, int);
469         va_end(list);
470         if (pmu_data_len[req->data[0]][1] != 0) {
471                 req->reply[0] = ADB_RET_OK;
472                 req->reply_len = 1;
473         } else
474                 req->reply_len = 0;
475         req->reply_expected = 0;
476         return pmu_queue_request(req);
477 }
478
479 static int 
480 pmu_queue_request(struct adb_request *req)
481 {
482         unsigned long flags;
483         int nsend;
484
485         if (req->nbytes <= 0) {
486                 req->complete = 1;
487                 return 0;
488         }
489         nsend = pmu_data_len[req->data[0]][0];
490         if (nsend >= 0 && req->nbytes != nsend + 1) {
491                 req->complete = 1;
492                 return -EINVAL;
493         }
494
495         req->next = NULL;
496         req->sent = 0;
497         req->complete = 0;
498         local_irq_save(flags);
499
500         if (current_req != 0) {
501                 last_req->next = req;
502                 last_req = req;
503         } else {
504                 current_req = req;
505                 last_req = req;
506                 if (pmu_state == idle)
507                         pmu_start();
508         }
509
510         local_irq_restore(flags);
511         return 0;
512 }
513
514 static void 
515 send_byte(int x)
516 {
517         via1[ACR] |= SR_CTRL;
518         via1[SR] = x;
519         via2[B] &= ~TREQ;               /* assert TREQ */
520 }
521
522 static void 
523 recv_byte(void)
524 {
525         char c;
526
527         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
528         c = via1[SR];           /* resets SR */
529         via2[B] &= ~TREQ;
530 }
531
532 static void 
533 pmu_start(void)
534 {
535         unsigned long flags;
536         struct adb_request *req;
537
538         /* assert pmu_state == idle */
539         /* get the packet to send */
540         local_irq_save(flags);
541         req = current_req;
542         if (req == 0 || pmu_state != idle
543             || (req->reply_expected && req_awaiting_reply))
544                 goto out;
545
546         pmu_state = sending;
547         data_index = 1;
548         data_len = pmu_data_len[req->data[0]][0];
549
550         /* set the shift register to shift out and send a byte */
551         send_byte(req->data[0]);
552
553 out:
554         local_irq_restore(flags);
555 }
556
557 void 
558 pmu_poll(void)
559 {
560         unsigned long flags;
561
562         local_irq_save(flags);
563         if (via1[IFR] & SR_INT) {
564                 via1[IFR] = SR_INT;
565                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
566         }
567         if (via1[IFR] & CB1_INT) {
568                 via1[IFR] = CB1_INT;
569                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
570         }
571         local_irq_restore(flags);
572 }
573
574 static irqreturn_t
575 pmu_interrupt(int irq, void *dev_id)
576 {
577         struct adb_request *req;
578         int timeout, bite = 0;  /* to prevent compiler warning */
579
580 #if 0
581         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
582                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
583 #endif
584
585         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
586                 adb_int_pending = 1;
587         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
588                 if (via2[B] & TACK) {
589                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
590                 }
591
592                 /* if reading grab the byte */
593                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
594
595                 /* reset TREQ and wait for TACK to go high */
596                 via2[B] |= TREQ;
597                 timeout = 3200;
598                 while (!(via2[B] & TACK)) {
599                         if (--timeout < 0) {
600                                 printk(KERN_ERR "PMU not responding (!ack)\n");
601                                 goto finish;
602                         }
603                         udelay(10);
604                 }
605
606                 switch (pmu_state) {
607                 case sending:
608                         req = current_req;
609                         if (data_len < 0) {
610                                 data_len = req->nbytes - 1;
611                                 send_byte(data_len);
612                                 break;
613                         }
614                         if (data_index <= data_len) {
615                                 send_byte(req->data[data_index++]);
616                                 break;
617                         }
618                         req->sent = 1;
619                         data_len = pmu_data_len[req->data[0]][1];
620                         if (data_len == 0) {
621                                 pmu_state = idle;
622                                 current_req = req->next;
623                                 if (req->reply_expected)
624                                         req_awaiting_reply = req;
625                                 else
626                                         pmu_done(req);
627                         } else {
628                                 pmu_state = reading;
629                                 data_index = 0;
630                                 reply_ptr = req->reply + req->reply_len;
631                                 recv_byte();
632                         }
633                         break;
634
635                 case intack:
636                         data_index = 0;
637                         data_len = -1;
638                         pmu_state = reading_intr;
639                         reply_ptr = interrupt_data;
640                         recv_byte();
641                         break;
642
643                 case reading:
644                 case reading_intr:
645                         if (data_len == -1) {
646                                 data_len = bite;
647                                 if (bite > 32)
648                                         printk(KERN_ERR "PMU: bad reply len %d\n",
649                                                bite);
650                         } else {
651                                 reply_ptr[data_index++] = bite;
652                         }
653                         if (data_index < data_len) {
654                                 recv_byte();
655                                 break;
656                         }
657
658                         if (pmu_state == reading_intr) {
659                                 pmu_handle_data(interrupt_data, data_index);
660                         } else {
661                                 req = current_req;
662                                 current_req = req->next;
663                                 req->reply_len += data_index;
664                                 pmu_done(req);
665                         }
666                         pmu_state = idle;
667
668                         break;
669
670                 default:
671                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
672                                pmu_state);
673                 }
674         }
675 finish:
676         if (pmu_state == idle) {
677                 if (adb_int_pending) {
678                         pmu_state = intack;
679                         send_byte(PMU_INT_ACK);
680                         adb_int_pending = 0;
681                 } else if (current_req) {
682                         pmu_start();
683                 }
684         }
685
686 #if 0
687         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
688                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
689 #endif
690         return IRQ_HANDLED;
691 }
692
693 static void 
694 pmu_done(struct adb_request *req)
695 {
696         req->complete = 1;
697         if (req->done)
698                 (*req->done)(req);
699 }
700
701 /* Interrupt data could be the result data from an ADB cmd */
702 static void 
703 pmu_handle_data(unsigned char *data, int len)
704 {
705         static int show_pmu_ints = 1;
706
707         asleep = 0;
708         if (len < 1) {
709                 adb_int_pending = 0;
710                 return;
711         }
712         if (data[0] & PMU_INT_ADB) {
713                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
714                         struct adb_request *req = req_awaiting_reply;
715                         if (req == 0) {
716                                 printk(KERN_ERR "PMU: extra ADB reply\n");
717                                 return;
718                         }
719                         req_awaiting_reply = NULL;
720                         if (len <= 2)
721                                 req->reply_len = 0;
722                         else {
723                                 memcpy(req->reply, data + 1, len - 1);
724                                 req->reply_len = len - 1;
725                         }
726                         pmu_done(req);
727                 } else {
728                         adb_input(data+1, len-1, 1);
729                 }
730         } else {
731                 if (data[0] == 0x08 && len == 3) {
732                         /* sound/brightness buttons pressed */
733                         pmu_set_brightness(data[1] >> 3);
734                         set_volume(data[2]);
735                 } else if (show_pmu_ints
736                            && !(data[0] == PMU_INT_TICK && len == 1)) {
737                         int i;
738                         printk(KERN_DEBUG "pmu intr");
739                         for (i = 0; i < len; ++i)
740                                 printk(" %.2x", data[i]);
741                         printk("\n");
742                 }
743         }
744 }
745
746 int backlight_level = -1;
747 int backlight_enabled = 0;
748
749 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
750
751 static void 
752 pmu_enable_backlight(int on)
753 {
754         struct adb_request req;
755
756         if (on) {
757             /* first call: get current backlight value */
758             if (backlight_level < 0) {
759                 switch(pmu_kind) {
760                     case PMU_68K_V1:
761                     case PMU_68K_V2:
762                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
763                         while (!req.complete)
764                                 pmu_poll();
765                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
766                         backlight_level = req.reply[1];
767                         break;
768                     default:
769                         backlight_enabled = 0;
770                         return;
771                 }
772             }
773             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
774                 LEVEL_TO_BRIGHT(backlight_level));
775             while (!req.complete)
776                 pmu_poll();
777         }
778         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
779             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
780         while (!req.complete)
781                 pmu_poll();
782         backlight_enabled = on;
783 }
784
785 static void 
786 pmu_set_brightness(int level)
787 {
788         int bright;
789
790         backlight_level = level;
791         bright = LEVEL_TO_BRIGHT(level);
792         if (!backlight_enabled)
793                 return;
794         if (bright_req_1.complete)
795                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
796                     bright);
797         if (bright_req_2.complete)
798                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
799                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
800 }
801
802 void 
803 pmu_enable_irled(int on)
804 {
805         struct adb_request req;
806
807         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
808             (on ? PMU_POW_ON : PMU_POW_OFF));
809         while (!req.complete)
810                 pmu_poll();
811 }
812
813 static void 
814 set_volume(int level)
815 {
816 }
817
818 int
819 pmu_present(void)
820 {
821         return (pmu_kind != PMU_UNKNOWN);
822 }
823
824 #if 0 /* needs some work for 68K */
825
826 /*
827  * This struct is used to store config register values for
828  * PCI devices which may get powered off when we sleep.
829  */
830 static struct pci_save {
831         u16     command;
832         u16     cache_lat;
833         u16     intr;
834 } *pbook_pci_saves;
835 static int n_pbook_pci_saves;
836
837 static inline void
838 pbook_pci_save(void)
839 {
840         int npci;
841         struct pci_dev *pd = NULL;
842         struct pci_save *ps;
843
844         npci = 0;
845         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL)
846                 ++npci;
847         n_pbook_pci_saves = npci;
848         if (npci == 0)
849                 return;
850         ps = (struct pci_save *) kmalloc(npci * sizeof(*ps), GFP_KERNEL);
851         pbook_pci_saves = ps;
852         if (ps == NULL)
853                 return;
854
855         pd = NULL;
856         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
857                 pci_read_config_word(pd, PCI_COMMAND, &ps->command);
858                 pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
859                 pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
860                 ++ps;
861                 --npci;
862         }
863 }
864
865 static inline void
866 pbook_pci_restore(void)
867 {
868         u16 cmd;
869         struct pci_save *ps = pbook_pci_saves;
870         struct pci_dev *pd = NULL;
871         int j;
872
873         while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
874                 if (ps->command == 0)
875                         continue;
876                 pci_read_config_word(pd, PCI_COMMAND, &cmd);
877                 if ((ps->command & ~cmd) == 0)
878                         continue;
879                 switch (pd->hdr_type) {
880                 case PCI_HEADER_TYPE_NORMAL:
881                         for (j = 0; j < 6; ++j)
882                                 pci_write_config_dword(pd,
883                                         PCI_BASE_ADDRESS_0 + j*4,
884                                         pd->resource[j].start);
885                         pci_write_config_dword(pd, PCI_ROM_ADDRESS,
886                                pd->resource[PCI_ROM_RESOURCE].start);
887                         pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
888                                 ps->cache_lat);
889                         pci_write_config_word(pd, PCI_INTERRUPT_LINE,
890                                 ps->intr);
891                         pci_write_config_word(pd, PCI_COMMAND, ps->command);
892                         break;
893                         /* other header types not restored at present */
894                 }
895         }
896 }
897
898 /*
899  * Put the powerbook to sleep.
900  */
901 #define IRQ_ENABLE      ((unsigned int *)0xf3000024)
902 #define MEM_CTRL        ((unsigned int *)0xf8000070)
903
904 int powerbook_sleep(void)
905 {
906         int ret, i, x;
907         static int save_backlight;
908         static unsigned int save_irqen;
909         unsigned long msr;
910         unsigned int hid0;
911         unsigned long p, wait;
912         struct adb_request sleep_req;
913
914         /* Notify device drivers */
915         ret = blocking_notifier_call_chain(&sleep_notifier_list,
916                         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         blocking_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 pmu_open(struct inode *inode, struct file *file)
1005 {
1006         return 0;
1007 }
1008
1009 static ssize_t pmu_read(struct file *file, char *buf,
1010                         size_t count, loff_t *ppos)
1011 {
1012         return 0;
1013 }
1014
1015 static ssize_t pmu_write(struct file *file, const char *buf,
1016                          size_t count, loff_t *ppos)
1017 {
1018         return 0;
1019 }
1020
1021 static int pmu_ioctl(struct inode * inode, struct file *filp,
1022                      u_int cmd, u_long arg)
1023 {
1024         int error;
1025         __u32 value;
1026
1027         switch (cmd) {
1028             case PMU_IOC_SLEEP:
1029                 return -ENOSYS;
1030             case PMU_IOC_GET_BACKLIGHT:
1031                 return put_user(backlight_level, (__u32 *)arg);
1032             case PMU_IOC_SET_BACKLIGHT:
1033                 error = get_user(value, (__u32 *)arg);
1034                 if (!error)
1035                         pmu_set_brightness(value);
1036                 return error;
1037             case PMU_IOC_GET_MODEL:
1038                 return put_user(pmu_kind, (__u32 *)arg);
1039         }
1040         return -EINVAL;
1041 }
1042
1043 static struct file_operations pmu_device_fops = {
1044         .read           = pmu_read,
1045         .write          = pmu_write,
1046         .ioctl          = pmu_ioctl,
1047         .open           = pmu_open,
1048 };
1049
1050 static struct miscdevice pmu_device = {
1051         PMU_MINOR, "pmu", &pmu_device_fops
1052 };
1053
1054 void pmu_device_init(void)
1055 {
1056         if (!via)
1057                 return;
1058         if (misc_register(&pmu_device) < 0)
1059                 printk(KERN_ERR "via-pmu68k: cannot register misc device.\n");
1060 }
1061 #endif /* CONFIG_PMAC_PBOOK */
1062