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[PATCH] kdump: Routines for copying dump pages
[linux-2.6/mini2440.git] / drivers / macintosh / via-pmu68k.c
blob820dc52e30bce417c52267a4f4dd36dd5a35c0aa
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
Support for the Chinese Samsung S3C2440 based development boards