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[S390] cio: Use path verification to check for path state.
[linux-2.6/libata-dev.git] / drivers / macintosh / via-pmu68k.c
blob356c7216a1795e7b4eb183cda6a349e3efdff133
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/miscdevice.h>
26 #include <linux/blkdev.h>
27 #include <linux/pci.h>
28 #include <linux/slab.h>
29 #include <linux/init.h>
30 #include <linux/interrupt.h>
31
32 #include <linux/adb.h>
33 #include <linux/pmu.h>
34 #include <linux/cuda.h>
35
36 #include <asm/macintosh.h>
37 #include <asm/macints.h>
38 #include <asm/machw.h>
39 #include <asm/mac_via.h>
40
41 #include <asm/pgtable.h>
42 #include <asm/system.h>
43 #include <asm/irq.h>
44 #include <asm/uaccess.h>
45
46 /* Misc minor number allocated for /dev/pmu */
47 #define PMU_MINOR 154
48
49 /* VIA registers - spaced 0x200 bytes apart */
50 #define RS 0x200 /* skip between registers */
51 #define B 0 /* B-side data */
52 #define A RS /* A-side data */
53 #define DIRB (2*RS) /* B-side direction (1=output) */
54 #define DIRA (3*RS) /* A-side direction (1=output) */
55 #define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
56 #define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
57 #define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
58 #define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
59 #define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
60 #define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
61 #define SR (10*RS) /* Shift register */
62 #define ACR (11*RS) /* Auxiliary control register */
63 #define PCR (12*RS) /* Peripheral control register */
64 #define IFR (13*RS) /* Interrupt flag register */
65 #define IER (14*RS) /* Interrupt enable register */
66 #define ANH (15*RS) /* A-side data, no handshake */
67
68 /* Bits in B data register: both active low */
69 #define TACK 0x02 /* Transfer acknowledge (input) */
70 #define TREQ 0x04 /* Transfer request (output) */
71
72 /* Bits in ACR */
73 #define SR_CTRL 0x1c /* Shift register control bits */
74 #define SR_EXT 0x0c /* Shift on external clock */
75 #define SR_OUT 0x10 /* Shift out if 1 */
76
77 /* Bits in IFR and IER */
78 #define SR_INT 0x04 /* Shift register full/empty */
79 #define CB1_INT 0x10 /* transition on CB1 input */
80
81 static enum pmu_state {
82 idle,
83 sending,
84 intack,
85 reading,
86 reading_intr,
87 } pmu_state;
88
89 static struct adb_request *current_req;
90 static struct adb_request *last_req;
91 static struct adb_request *req_awaiting_reply;
92 static unsigned char interrupt_data[32];
93 static unsigned char *reply_ptr;
94 static int data_index;
95 static int data_len;
96 static int adb_int_pending;
97 static int pmu_adb_flags;
98 static int adb_dev_map;
99 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
100 static int pmu_kind = PMU_UNKNOWN;
101 static int pmu_fully_inited;
102
103 int asleep;
104 BLOCKING_NOTIFIER_HEAD(sleep_notifier_list);
105
106 static int pmu_probe(void);
107 static int pmu_init(void);
108 static void pmu_start(void);
109 static irqreturn_t pmu_interrupt(int irq, void *arg);
110 static int pmu_send_request(struct adb_request *req, int sync);
111 static int pmu_autopoll(int devs);
112 void pmu_poll(void);
113 static int pmu_reset_bus(void);
114 static int pmu_queue_request(struct adb_request *req);
115
116 static void pmu_start(void);
117 static void send_byte(int x);
118 static void recv_byte(void);
119 static void pmu_done(struct adb_request *req);
120 static void pmu_handle_data(unsigned char *data, int len);
121 static void set_volume(int level);
122 static void pmu_enable_backlight(int on);
123 static void pmu_set_brightness(int level);
124
125 struct adb_driver via_pmu_driver = {
126 "68K PMU",
127 pmu_probe,
128 pmu_init,
129 pmu_send_request,
130 pmu_autopoll,
131 pmu_poll,
132 pmu_reset_bus
133 };
134
135 /*
136 * This table indicates for each PMU opcode:
137 * - the number of data bytes to be sent with the command, or -1
138 * if a length byte should be sent,
139 * - the number of response bytes which the PMU will return, or
140 * -1 if it will send a length byte.
141 */
142 static s8 pmu_data_len[256][2] = {
143 /* 0 1 2 3 4 5 6 7 */
144 /*00*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
145 /*08*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
146 /*10*/ { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
147 /*18*/ { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
148 /*20*/ {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
149 /*28*/ { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
150 /*30*/ { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
151 /*38*/ { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
152 /*40*/ { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
153 /*48*/ { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
154 /*50*/ { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
155 /*58*/ { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
156 /*60*/ { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
157 /*68*/ { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
158 /*70*/ { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
159 /*78*/ { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
160 /*80*/ { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
161 /*88*/ { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
162 /*90*/ { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
163 /*98*/ { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
164 /*a0*/ { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
165 /*a8*/ { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
166 /*b0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
167 /*b8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
168 /*c0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
169 /*c8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
170 /*d0*/ { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
171 /*d8*/ { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
172 /*e0*/ {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
173 /*e8*/ { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
174 /*f0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
175 /*f8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
176 };
177
178 int pmu_probe(void)
179 {
180 if (macintosh_config->adb_type == MAC_ADB_PB1) {
181 pmu_kind = PMU_68K_V1;
182 } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
183 pmu_kind = PMU_68K_V2;
184 } else {
185 return -ENODEV;
186 }
187
188 pmu_state = idle;
189
190 return 0;
191 }
192
193 static int
194 pmu_init(void)
195 {
196 int timeout;
197 volatile struct adb_request req;
198
199 via2[B] |= TREQ; /* negate TREQ */
200 via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK; /* TACK in, TREQ out */
201
202 pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
203 timeout = 100000;
204 while (!req.complete) {
205 if (--timeout < 0) {
206 printk(KERN_ERR "pmu_init: no response from PMU\n");
207 return -EAGAIN;
208 }
209 udelay(10);
210 pmu_poll();
211 }
212
213 /* ack all pending interrupts */
214 timeout = 100000;
215 interrupt_data[0] = 1;
216 while (interrupt_data[0] || pmu_state != idle) {
217 if (--timeout < 0) {
218 printk(KERN_ERR "pmu_init: timed out acking intrs\n");
219 return -EAGAIN;
220 }
221 if (pmu_state == idle) {
222 adb_int_pending = 1;
223 pmu_interrupt(0, NULL);
224 }
225 pmu_poll();
226 udelay(10);
227 }
228
229 pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
230 PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
231 timeout = 100000;
232 while (!req.complete) {
233 if (--timeout < 0) {
234 printk(KERN_ERR "pmu_init: no response from PMU\n");
235 return -EAGAIN;
236 }
237 udelay(10);
238 pmu_poll();
239 }
240
241 bright_req_1.complete = 1;
242 bright_req_2.complete = 1;
243 bright_req_3.complete = 1;
244
245 if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
246 pmu_interrupt)) {
247 printk(KERN_ERR "pmu_init: can't get irq %d\n",
248 IRQ_MAC_ADB_SR);
249 return -EAGAIN;
250 }
251 if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
252 pmu_interrupt)) {
253 printk(KERN_ERR "pmu_init: can't get irq %d\n",
254 IRQ_MAC_ADB_CL);
255 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
256 return -EAGAIN;
257 }
258
259 pmu_fully_inited = 1;
260
261 /* Enable backlight */
262 pmu_enable_backlight(1);
263
264 printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
265
266 return 0;
267 }
268
269 int
270 pmu_get_model(void)
271 {
272 return pmu_kind;
273 }
274
275 /* Send an ADB command */
276 static int
277 pmu_send_request(struct adb_request *req, int sync)
278 {
279 int i, ret;
280
281 if (!pmu_fully_inited)
282 {
283 req->complete = 1;
284 return -ENXIO;
285 }
286
287 ret = -EINVAL;
288
289 switch (req->data[0]) {
290 case PMU_PACKET:
291 for (i = 0; i < req->nbytes - 1; ++i)
292 req->data[i] = req->data[i+1];
293 --req->nbytes;
294 if (pmu_data_len[req->data[0]][1] != 0) {
295 req->reply[0] = ADB_RET_OK;
296 req->reply_len = 1;
297 } else
298 req->reply_len = 0;
299 ret = pmu_queue_request(req);
300 break;
301 case CUDA_PACKET:
302 switch (req->data[1]) {
303 case CUDA_GET_TIME:
304 if (req->nbytes != 2)
305 break;
306 req->data[0] = PMU_READ_RTC;
307 req->nbytes = 1;
308 req->reply_len = 3;
309 req->reply[0] = CUDA_PACKET;
310 req->reply[1] = 0;
311 req->reply[2] = CUDA_GET_TIME;
312 ret = pmu_queue_request(req);
313 break;
314 case CUDA_SET_TIME:
315 if (req->nbytes != 6)
316 break;
317 req->data[0] = PMU_SET_RTC;
318 req->nbytes = 5;
319 for (i = 1; i <= 4; ++i)
320 req->data[i] = req->data[i+1];
321 req->reply_len = 3;
322 req->reply[0] = CUDA_PACKET;
323 req->reply[1] = 0;
324 req->reply[2] = CUDA_SET_TIME;
325 ret = pmu_queue_request(req);
326 break;
327 case CUDA_GET_PRAM:
328 if (req->nbytes != 4)
329 break;
330 req->data[0] = PMU_READ_NVRAM;
331 req->data[1] = req->data[2];
332 req->data[2] = req->data[3];
333 req->nbytes = 3;
334 req->reply_len = 3;
335 req->reply[0] = CUDA_PACKET;
336 req->reply[1] = 0;
337 req->reply[2] = CUDA_GET_PRAM;
338 ret = pmu_queue_request(req);
339 break;
340 case CUDA_SET_PRAM:
341 if (req->nbytes != 5)
342 break;
343 req->data[0] = PMU_WRITE_NVRAM;
344 req->data[1] = req->data[2];
345 req->data[2] = req->data[3];
346 req->data[3] = req->data[4];
347 req->nbytes = 4;
348 req->reply_len = 3;
349 req->reply[0] = CUDA_PACKET;
350 req->reply[1] = 0;
351 req->reply[2] = CUDA_SET_PRAM;
352 ret = pmu_queue_request(req);
353 break;
354 }
355 break;
356 case ADB_PACKET:
357 for (i = req->nbytes - 1; i > 1; --i)
358 req->data[i+2] = req->data[i];
359 req->data[3] = req->nbytes - 2;
360 req->data[2] = pmu_adb_flags;
361 /*req->data[1] = req->data[1];*/
362 req->data[0] = PMU_ADB_CMD;
363 req->nbytes += 2;
364 req->reply_expected = 1;
365 req->reply_len = 0;
366 ret = pmu_queue_request(req);
367 break;
368 }
369 if (ret)
370 {
371 req->complete = 1;
372 return ret;
373 }
374
375 if (sync) {
376 while (!req->complete)
377 pmu_poll();
378 }
379
380 return 0;
381 }
382
383 /* Enable/disable autopolling */
384 static int
385 pmu_autopoll(int devs)
386 {
387 struct adb_request req;
388
389 if (!pmu_fully_inited) return -ENXIO;
390
391 if (devs) {
392 adb_dev_map = devs;
393 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
394 adb_dev_map >> 8, adb_dev_map);
395 pmu_adb_flags = 2;
396 } else {
397 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
398 pmu_adb_flags = 0;
399 }
400 while (!req.complete)
401 pmu_poll();
402 return 0;
403 }
404
405 /* Reset the ADB bus */
406 static int
407 pmu_reset_bus(void)
408 {
409 struct adb_request req;
410 long timeout;
411 int save_autopoll = adb_dev_map;
412
413 if (!pmu_fully_inited) return -ENXIO;
414
415 /* anyone got a better idea?? */
416 pmu_autopoll(0);
417
418 req.nbytes = 5;
419 req.done = NULL;
420 req.data[0] = PMU_ADB_CMD;
421 req.data[1] = 0;
422 req.data[2] = 3; /* ADB_BUSRESET ??? */
423 req.data[3] = 0;
424 req.data[4] = 0;
425 req.reply_len = 0;
426 req.reply_expected = 1;
427 if (pmu_queue_request(&req) != 0)
428 {
429 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
430 return -EIO;
431 }
432 while (!req.complete)
433 pmu_poll();
434 timeout = 100000;
435 while (!req.complete) {
436 if (--timeout < 0) {
437 printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
438 return -EIO;
439 }
440 udelay(10);
441 pmu_poll();
442 }
443
444 if (save_autopoll != 0)
445 pmu_autopoll(save_autopoll);
446
447 return 0;
448 }
449
450 /* Construct and send a pmu request */
451 int
452 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
453 int nbytes, ...)
454 {
455 va_list list;
456 int i;
457
458 if (nbytes < 0 || nbytes > 32) {
459 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
460 req->complete = 1;
461 return -EINVAL;
462 }
463 req->nbytes = nbytes;
464 req->done = done;
465 va_start(list, nbytes);
466 for (i = 0; i < nbytes; ++i)
467 req->data[i] = va_arg(list, int);
468 va_end(list);
469 if (pmu_data_len[req->data[0]][1] != 0) {
470 req->reply[0] = ADB_RET_OK;
471 req->reply_len = 1;
472 } else
473 req->reply_len = 0;
474 req->reply_expected = 0;
475 return pmu_queue_request(req);
476 }
477
478 static int
479 pmu_queue_request(struct adb_request *req)
480 {
481 unsigned long flags;
482 int nsend;
483
484 if (req->nbytes <= 0) {
485 req->complete = 1;
486 return 0;
487 }
488 nsend = pmu_data_len[req->data[0]][0];
489 if (nsend >= 0 && req->nbytes != nsend + 1) {
490 req->complete = 1;
491 return -EINVAL;
492 }
493
494 req->next = NULL;
495 req->sent = 0;
496 req->complete = 0;
497 local_irq_save(flags);
498
499 if (current_req != 0) {
500 last_req->next = req;
501 last_req = req;
502 } else {
503 current_req = req;
504 last_req = req;
505 if (pmu_state == idle)
506 pmu_start();
507 }
508
509 local_irq_restore(flags);
510 return 0;
511 }
512
513 static void
514 send_byte(int x)
515 {
516 via1[ACR] |= SR_CTRL;
517 via1[SR] = x;
518 via2[B] &= ~TREQ; /* assert TREQ */
519 }
520
521 static void
522 recv_byte(void)
523 {
524 char c;
525
526 via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
527 c = via1[SR]; /* resets SR */
528 via2[B] &= ~TREQ;
529 }
530
531 static void
532 pmu_start(void)
533 {
534 unsigned long flags;
535 struct adb_request *req;
536
537 /* assert pmu_state == idle */
538 /* get the packet to send */
539 local_irq_save(flags);
540 req = current_req;
541 if (req == 0 || pmu_state != idle
542 || (req->reply_expected && req_awaiting_reply))
543 goto out;
544
545 pmu_state = sending;
546 data_index = 1;
547 data_len = pmu_data_len[req->data[0]][0];
548
549 /* set the shift register to shift out and send a byte */
550 send_byte(req->data[0]);
551
552 out:
553 local_irq_restore(flags);
554 }
555
556 void
557 pmu_poll(void)
558 {
559 unsigned long flags;
560
561 local_irq_save(flags);
562 if (via1[IFR] & SR_INT) {
563 via1[IFR] = SR_INT;
564 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
565 }
566 if (via1[IFR] & CB1_INT) {
567 via1[IFR] = CB1_INT;
568 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
569 }
570 local_irq_restore(flags);
571 }
572
573 static irqreturn_t
574 pmu_interrupt(int irq, void *dev_id)
575 {
576 struct adb_request *req;
577 int timeout, bite = 0; /* to prevent compiler warning */
578
579 #if 0
580 printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
581 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
582 #endif
583
584 if (irq == IRQ_MAC_ADB_CL) { /* CB1 interrupt */
585 adb_int_pending = 1;
586 } else if (irq == IRQ_MAC_ADB_SR) { /* SR interrupt */
587 if (via2[B] & TACK) {
588 printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
589 }
590
591 /* if reading grab the byte */
592 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
593
594 /* reset TREQ and wait for TACK to go high */
595 via2[B] |= TREQ;
596 timeout = 3200;
597 while (!(via2[B] & TACK)) {
598 if (--timeout < 0) {
599 printk(KERN_ERR "PMU not responding (!ack)\n");
600 goto finish;
601 }
602 udelay(10);
603 }
604
605 switch (pmu_state) {
606 case sending:
607 req = current_req;
608 if (data_len < 0) {
609 data_len = req->nbytes - 1;
610 send_byte(data_len);
611 break;
612 }
613 if (data_index <= data_len) {
614 send_byte(req->data[data_index++]);
615 break;
616 }
617 req->sent = 1;
618 data_len = pmu_data_len[req->data[0]][1];
619 if (data_len == 0) {
620 pmu_state = idle;
621 current_req = req->next;
622 if (req->reply_expected)
623 req_awaiting_reply = req;
624 else
625 pmu_done(req);
626 } else {
627 pmu_state = reading;
628 data_index = 0;
629 reply_ptr = req->reply + req->reply_len;
630 recv_byte();
631 }
632 break;
633
634 case intack:
635 data_index = 0;
636 data_len = -1;
637 pmu_state = reading_intr;
638 reply_ptr = interrupt_data;
639 recv_byte();
640 break;
641
642 case reading:
643 case reading_intr:
644 if (data_len == -1) {
645 data_len = bite;
646 if (bite > 32)
647 printk(KERN_ERR "PMU: bad reply len %d\n",
648 bite);
649 } else {
650 reply_ptr[data_index++] = bite;
651 }
652 if (data_index < data_len) {
653 recv_byte();
654 break;
655 }
656
657 if (pmu_state == reading_intr) {
658 pmu_handle_data(interrupt_data, data_index);
659 } else {
660 req = current_req;
661 current_req = req->next;
662 req->reply_len += data_index;
663 pmu_done(req);
664 }
665 pmu_state = idle;
666
667 break;
668
669 default:
670 printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
671 pmu_state);
672 }
673 }
674 finish:
675 if (pmu_state == idle) {
676 if (adb_int_pending) {
677 pmu_state = intack;
678 send_byte(PMU_INT_ACK);
679 adb_int_pending = 0;
680 } else if (current_req) {
681 pmu_start();
682 }
683 }
684
685 #if 0
686 printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
687 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
688 #endif
689 return IRQ_HANDLED;
690 }
691
692 static void
693 pmu_done(struct adb_request *req)
694 {
695 req->complete = 1;
696 if (req->done)
697 (*req->done)(req);
698 }
699
700 /* Interrupt data could be the result data from an ADB cmd */
701 static void
702 pmu_handle_data(unsigned char *data, int len)
703 {
704 static int show_pmu_ints = 1;
705
706 asleep = 0;
707 if (len < 1) {
708 adb_int_pending = 0;
709 return;
710 }
711 if (data[0] & PMU_INT_ADB) {
712 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
713 struct adb_request *req = req_awaiting_reply;
714 if (req == 0) {
715 printk(KERN_ERR "PMU: extra ADB reply\n");
716 return;
717 }
718 req_awaiting_reply = NULL;
719 if (len <= 2)
720 req->reply_len = 0;
721 else {
722 memcpy(req->reply, data + 1, len - 1);
723 req->reply_len = len - 1;
724 }
725 pmu_done(req);
726 } else {
727 adb_input(data+1, len-1, 1);
728 }
729 } else {
730 if (data[0] == 0x08 && len == 3) {
731 /* sound/brightness buttons pressed */
732 pmu_set_brightness(data[1] >> 3);
733 set_volume(data[2]);
734 } else if (show_pmu_ints
735 && !(data[0] == PMU_INT_TICK && len == 1)) {
736 int i;
737 printk(KERN_DEBUG "pmu intr");
738 for (i = 0; i < len; ++i)
739 printk(" %.2x", data[i]);
740 printk("\n");
741 }
742 }
743 }
744
745 int backlight_level = -1;
746 int backlight_enabled = 0;
747
748 #define LEVEL_TO_BRIGHT(lev) ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
749
750 static void
751 pmu_enable_backlight(int on)
752 {
753 struct adb_request req;
754
755 if (on) {
756 /* first call: get current backlight value */
757 if (backlight_level < 0) {
758 switch(pmu_kind) {
759 case PMU_68K_V1:
760 case PMU_68K_V2:
761 pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
762 while (!req.complete)
763 pmu_poll();
764 printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
765 backlight_level = req.reply[1];
766 break;
767 default:
768 backlight_enabled = 0;
769 return;
770 }
771 }
772 pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
773 LEVEL_TO_BRIGHT(backlight_level));
774 while (!req.complete)
775 pmu_poll();
776 }
777 pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
778 PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
779 while (!req.complete)
780 pmu_poll();
781 backlight_enabled = on;
782 }
783
784 static void
785 pmu_set_brightness(int level)
786 {
787 int bright;
788
789 backlight_level = level;
790 bright = LEVEL_TO_BRIGHT(level);
791 if (!backlight_enabled)
792 return;
793 if (bright_req_1.complete)
794 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
795 bright);
796 if (bright_req_2.complete)
797 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
798 PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
799 }
800
801 void
802 pmu_enable_irled(int on)
803 {
804 struct adb_request req;
805
806 pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
807 (on ? PMU_POW_ON : PMU_POW_OFF));
808 while (!req.complete)
809 pmu_poll();
810 }
811
812 static void
813 set_volume(int level)
814 {
815 }
816
817 int
818 pmu_present(void)
819 {
820 return (pmu_kind != PMU_UNKNOWN);
821 }
822
823 #if 0 /* needs some work for 68K */
824
825 /*
826 * This struct is used to store config register values for
827 * PCI devices which may get powered off when we sleep.
828 */
829 static struct pci_save {
830 u16 command;
831 u16 cache_lat;
832 u16 intr;
833 } *pbook_pci_saves;
834 static int n_pbook_pci_saves;
835
836 static inline void
837 pbook_pci_save(void)
838 {
839 int npci;
840 struct pci_dev *pd = NULL;
841 struct pci_save *ps;
842
843 npci = 0;
844 while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL)
845 ++npci;
846 n_pbook_pci_saves = npci;
847 if (npci == 0)
848 return;
849 ps = kmalloc(npci * sizeof(*ps), GFP_KERNEL);
850 pbook_pci_saves = ps;
851 if (ps == NULL)
852 return;
853
854 pd = NULL;
855 while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
856 pci_read_config_word(pd, PCI_COMMAND, &ps->command);
857 pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
858 pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
859 ++ps;
860 --npci;
861 }
862 }
863
864 static inline void
865 pbook_pci_restore(void)
866 {
867 u16 cmd;
868 struct pci_save *ps = pbook_pci_saves;
869 struct pci_dev *pd = NULL;
870 int j;
871
872 while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
873 if (ps->command == 0)
874 continue;
875 pci_read_config_word(pd, PCI_COMMAND, &cmd);
876 if ((ps->command & ~cmd) == 0)
877 continue;
878 switch (pd->hdr_type) {
879 case PCI_HEADER_TYPE_NORMAL:
880 for (j = 0; j < 6; ++j)
881 pci_write_config_dword(pd,
882 PCI_BASE_ADDRESS_0 + j*4,
883 pd->resource[j].start);
884 pci_write_config_dword(pd, PCI_ROM_ADDRESS,
885 pd->resource[PCI_ROM_RESOURCE].start);
886 pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
887 ps->cache_lat);
888 pci_write_config_word(pd, PCI_INTERRUPT_LINE,
889 ps->intr);
890 pci_write_config_word(pd, PCI_COMMAND, ps->command);
891 break;
892 /* other header types not restored at present */
893 }
894 }
895 }
896
897 /*
898 * Put the powerbook to sleep.
899 */
900 #define IRQ_ENABLE ((unsigned int *)0xf3000024)
901 #define MEM_CTRL ((unsigned int *)0xf8000070)
902
903 int powerbook_sleep(void)
904 {
905 int ret, i, x;
906 static int save_backlight;
907 static unsigned int save_irqen;
908 unsigned long msr;
909 unsigned int hid0;
910 unsigned long p, wait;
911 struct adb_request sleep_req;
912
913 /* Notify device drivers */
914 ret = blocking_notifier_call_chain(&sleep_notifier_list,
915 PBOOK_SLEEP, NULL);
916 if (ret & NOTIFY_STOP_MASK)
917 return -EBUSY;
918
919 /* Sync the disks. */
920 /* XXX It would be nice to have some way to ensure that
921 * nobody is dirtying any new buffers while we wait. */
922 sys_sync();
923
924 /* Turn off the display backlight */
925 save_backlight = backlight_enabled;
926 if (save_backlight)
927 pmu_enable_backlight(0);
928
929 /* Give the disks a little time to actually finish writing */
930 for (wait = jiffies + (HZ/4); time_before(jiffies, wait); )
931 mb();
932
933 /* Disable all interrupts except pmu */
934 save_irqen = in_le32(IRQ_ENABLE);
935 for (i = 0; i < 32; ++i)
936 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
937 disable_irq(i);
938 asm volatile("mtdec %0" : : "r" (0x7fffffff));
939
940 /* Save the state of PCI config space for some slots */
941 pbook_pci_save();
942
943 /* Set the memory controller to keep the memory refreshed
944 while we're asleep */
945 for (i = 0x403f; i >= 0x4000; --i) {
946 out_be32(MEM_CTRL, i);
947 do {
948 x = (in_be32(MEM_CTRL) >> 16) & 0x3ff;
949 } while (x == 0);
950 if (x >= 0x100)
951 break;
952 }
953
954 /* Ask the PMU to put us to sleep */
955 pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
956 while (!sleep_req.complete)
957 mb();
958 /* displacement-flush the L2 cache - necessary? */
959 for (p = KERNELBASE; p < KERNELBASE + 0x100000; p += 0x1000)
960 i = *(volatile int *)p;
961 asleep = 1;
962
963 /* Put the CPU into sleep mode */
964 asm volatile("mfspr %0,1008" : "=r" (hid0) :);
965 hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
966 asm volatile("mtspr 1008,%0" : : "r" (hid0));
967 local_save_flags(msr);
968 msr |= MSR_POW | MSR_EE;
969 local_irq_restore(msr);
970 udelay(10);
971
972 /* OK, we're awake again, start restoring things */
973 out_be32(MEM_CTRL, 0x3f);
974 pbook_pci_restore();
975
976 /* wait for the PMU interrupt sequence to complete */
977 while (asleep)
978 mb();
979
980 /* reenable interrupts */
981 for (i = 0; i < 32; ++i)
982 if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
983 enable_irq(i);
984
985 /* Notify drivers */
986 blocking_notifier_call_chain(&sleep_notifier_list, PBOOK_WAKE, NULL);
987
988 /* reenable ADB autopoll */
989 pmu_adb_autopoll(adb_dev_map);
990
991 /* Turn on the screen backlight, if it was on before */
992 if (save_backlight)
993 pmu_enable_backlight(1);
994
995 /* Wait for the hard disk to spin up */
996
997 return 0;
998 }
999
1000 /*
1001 * Support for /dev/pmu device
1002 */
1003 static int pmu_open(struct inode *inode, struct file *file)
1004 {
1005 return 0;
1006 }
1007
1008 static ssize_t pmu_read(struct file *file, char *buf,
1009 size_t count, loff_t *ppos)
1010 {
1011 return 0;
1012 }
1013
1014 static ssize_t pmu_write(struct file *file, const char *buf,
1015 size_t count, loff_t *ppos)
1016 {
1017 return 0;
1018 }
1019
1020 static int pmu_ioctl(struct inode * inode, struct file *filp,
1021 u_int cmd, u_long arg)
1022 {
1023 int error;
1024 __u32 value;
1025
1026 switch (cmd) {
1027 case PMU_IOC_SLEEP:
1028 return -ENOSYS;
1029 case PMU_IOC_GET_BACKLIGHT:
1030 return put_user(backlight_level, (__u32 *)arg);
1031 case PMU_IOC_SET_BACKLIGHT:
1032 error = get_user(value, (__u32 *)arg);
1033 if (!error)
1034 pmu_set_brightness(value);
1035 return error;
1036 case PMU_IOC_GET_MODEL:
1037 return put_user(pmu_kind, (__u32 *)arg);
1038 }
1039 return -EINVAL;
1040 }
1041
1042 static const struct file_operations pmu_device_fops = {
1043 .read = pmu_read,
1044 .write = pmu_write,
1045 .ioctl = pmu_ioctl,
1046 .open = pmu_open,
1047 };
1048
1049 static struct miscdevice pmu_device = {
1050 PMU_MINOR, "pmu", &pmu_device_fops
1051 };
1052
1053 void pmu_device_init(void)
1054 {
1055 if (!via)
1056 return;
1057 if (misc_register(&pmu_device) < 0)
1058 printk(KERN_ERR "via-pmu68k: cannot register misc device.\n");
1059 }
1060 #endif /* CONFIG_PMAC_PBOOK */
1061
Linux 2.6 libata-dev (mirror)