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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Device driver for the PMU on 68K-based Apple PowerBooks | |
4 | * | |
5 | * The VIA (versatile interface adapter) interfaces to the PMU, | |
6 | * a 6805 microprocessor core whose primary function is to control | |
7 | * battery charging and system power on the PowerBooks. | |
8 | * The PMU also controls the ADB (Apple Desktop Bus) which connects | |
9 | * to the keyboard and mouse, as well as the non-volatile RAM | |
10 | * and the RTC (real time clock) chip. | |
11 | * | |
12 | * Adapted for 68K PMU by Joshua M. Thompson | |
13 | * | |
14 | * Based largely on the PowerMac PMU code by Paul Mackerras and | |
15 | * Fabio Riccardi. | |
16 | * | |
17 | * Also based on the PMU driver from MkLinux by Apple Computer, Inc. | |
18 | * and the Open Software Foundation, Inc. | |
19 | */ | |
20 | ||
21 | #include <stdarg.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/delay.h> | |
1da177e4 LT |
26 | #include <linux/miscdevice.h> |
27 | #include <linux/blkdev.h> | |
28 | #include <linux/pci.h> | |
1da177e4 LT |
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> | |
1da177e4 LT |
38 | #include <asm/mac_via.h> |
39 | ||
40 | #include <asm/pgtable.h> | |
1da177e4 | 41 | #include <asm/irq.h> |
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | |
44 | /* Misc minor number allocated for /dev/pmu */ | |
45 | #define PMU_MINOR 154 | |
46 | ||
47 | /* VIA registers - spaced 0x200 bytes apart */ | |
48 | #define RS 0x200 /* skip between registers */ | |
49 | #define B 0 /* B-side data */ | |
50 | #define A RS /* A-side data */ | |
51 | #define DIRB (2*RS) /* B-side direction (1=output) */ | |
52 | #define DIRA (3*RS) /* A-side direction (1=output) */ | |
53 | #define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */ | |
54 | #define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */ | |
55 | #define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */ | |
56 | #define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */ | |
57 | #define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */ | |
58 | #define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */ | |
59 | #define SR (10*RS) /* Shift register */ | |
60 | #define ACR (11*RS) /* Auxiliary control register */ | |
61 | #define PCR (12*RS) /* Peripheral control register */ | |
62 | #define IFR (13*RS) /* Interrupt flag register */ | |
63 | #define IER (14*RS) /* Interrupt enable register */ | |
64 | #define ANH (15*RS) /* A-side data, no handshake */ | |
65 | ||
66 | /* Bits in B data register: both active low */ | |
67 | #define TACK 0x02 /* Transfer acknowledge (input) */ | |
68 | #define TREQ 0x04 /* Transfer request (output) */ | |
69 | ||
70 | /* Bits in ACR */ | |
71 | #define SR_CTRL 0x1c /* Shift register control bits */ | |
72 | #define SR_EXT 0x0c /* Shift on external clock */ | |
73 | #define SR_OUT 0x10 /* Shift out if 1 */ | |
74 | ||
75 | /* Bits in IFR and IER */ | |
76 | #define SR_INT 0x04 /* Shift register full/empty */ | |
77 | #define CB1_INT 0x10 /* transition on CB1 input */ | |
78 | ||
79 | static enum pmu_state { | |
80 | idle, | |
81 | sending, | |
82 | intack, | |
83 | reading, | |
84 | reading_intr, | |
85 | } pmu_state; | |
86 | ||
87 | static struct adb_request *current_req; | |
88 | static struct adb_request *last_req; | |
89 | static struct adb_request *req_awaiting_reply; | |
90 | static unsigned char interrupt_data[32]; | |
91 | static unsigned char *reply_ptr; | |
92 | static int data_index; | |
93 | static int data_len; | |
94 | static int adb_int_pending; | |
95 | static int pmu_adb_flags; | |
87275856 | 96 | static int adb_dev_map; |
1da177e4 LT |
97 | static struct adb_request bright_req_1, bright_req_2, bright_req_3; |
98 | static int pmu_kind = PMU_UNKNOWN; | |
87275856 | 99 | static int pmu_fully_inited; |
1da177e4 LT |
100 | |
101 | int asleep; | |
1da177e4 LT |
102 | |
103 | static int pmu_probe(void); | |
104 | static int pmu_init(void); | |
105 | static void pmu_start(void); | |
7d12e780 | 106 | static irqreturn_t pmu_interrupt(int irq, void *arg); |
1da177e4 LT |
107 | static int pmu_send_request(struct adb_request *req, int sync); |
108 | static int pmu_autopoll(int devs); | |
109 | void pmu_poll(void); | |
110 | static int pmu_reset_bus(void); | |
1da177e4 LT |
111 | |
112 | static void pmu_start(void); | |
113 | static void send_byte(int x); | |
114 | static void recv_byte(void); | |
115 | static void pmu_done(struct adb_request *req); | |
7d12e780 | 116 | static void pmu_handle_data(unsigned char *data, int len); |
1da177e4 LT |
117 | static void set_volume(int level); |
118 | static void pmu_enable_backlight(int on); | |
119 | static void pmu_set_brightness(int level); | |
120 | ||
121 | struct adb_driver via_pmu_driver = { | |
122 | "68K PMU", | |
123 | pmu_probe, | |
124 | pmu_init, | |
125 | pmu_send_request, | |
126 | pmu_autopoll, | |
127 | pmu_poll, | |
128 | pmu_reset_bus | |
129 | }; | |
130 | ||
131 | /* | |
132 | * This table indicates for each PMU opcode: | |
133 | * - the number of data bytes to be sent with the command, or -1 | |
134 | * if a length byte should be sent, | |
135 | * - the number of response bytes which the PMU will return, or | |
136 | * -1 if it will send a length byte. | |
137 | */ | |
138 | static s8 pmu_data_len[256][2] = { | |
139 | /* 0 1 2 3 4 5 6 7 */ | |
140 | /*00*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
141 | /*08*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
142 | /*10*/ { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
143 | /*18*/ { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0}, | |
144 | /*20*/ {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
145 | /*28*/ { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1}, | |
146 | /*30*/ { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
147 | /*38*/ { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0}, | |
148 | /*40*/ { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
149 | /*48*/ { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1}, | |
150 | /*50*/ { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0}, | |
151 | /*58*/ { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1}, | |
152 | /*60*/ { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
153 | /*68*/ { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1}, | |
154 | /*70*/ { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
155 | /*78*/ { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1}, | |
156 | /*80*/ { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
157 | /*88*/ { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
158 | /*90*/ { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
159 | /*98*/ { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
160 | /*a0*/ { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0}, | |
161 | /*a8*/ { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
162 | /*b0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
163 | /*b8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
164 | /*c0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
165 | /*c8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
166 | /*d0*/ { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
167 | /*d8*/ { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1}, | |
168 | /*e0*/ {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0}, | |
169 | /*e8*/ { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0}, | |
170 | /*f0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0}, | |
171 | /*f8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1}, | |
172 | }; | |
173 | ||
174 | int pmu_probe(void) | |
175 | { | |
176 | if (macintosh_config->adb_type == MAC_ADB_PB1) { | |
177 | pmu_kind = PMU_68K_V1; | |
178 | } else if (macintosh_config->adb_type == MAC_ADB_PB2) { | |
179 | pmu_kind = PMU_68K_V2; | |
180 | } else { | |
181 | return -ENODEV; | |
182 | } | |
183 | ||
184 | pmu_state = idle; | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static int | |
190 | pmu_init(void) | |
191 | { | |
192 | int timeout; | |
193 | volatile struct adb_request req; | |
194 | ||
195 | via2[B] |= TREQ; /* negate TREQ */ | |
196 | via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK; /* TACK in, TREQ out */ | |
197 | ||
198 | pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB); | |
199 | timeout = 100000; | |
200 | while (!req.complete) { | |
201 | if (--timeout < 0) { | |
202 | printk(KERN_ERR "pmu_init: no response from PMU\n"); | |
203 | return -EAGAIN; | |
204 | } | |
205 | udelay(10); | |
206 | pmu_poll(); | |
207 | } | |
208 | ||
209 | /* ack all pending interrupts */ | |
210 | timeout = 100000; | |
211 | interrupt_data[0] = 1; | |
212 | while (interrupt_data[0] || pmu_state != idle) { | |
213 | if (--timeout < 0) { | |
214 | printk(KERN_ERR "pmu_init: timed out acking intrs\n"); | |
215 | return -EAGAIN; | |
216 | } | |
217 | if (pmu_state == idle) { | |
218 | adb_int_pending = 1; | |
2850bc27 | 219 | pmu_interrupt(0, NULL); |
1da177e4 LT |
220 | } |
221 | pmu_poll(); | |
222 | udelay(10); | |
223 | } | |
224 | ||
225 | pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, | |
226 | PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB); | |
227 | timeout = 100000; | |
228 | while (!req.complete) { | |
229 | if (--timeout < 0) { | |
230 | printk(KERN_ERR "pmu_init: no response from PMU\n"); | |
231 | return -EAGAIN; | |
232 | } | |
233 | udelay(10); | |
234 | pmu_poll(); | |
235 | } | |
236 | ||
237 | bright_req_1.complete = 1; | |
238 | bright_req_2.complete = 1; | |
239 | bright_req_3.complete = 1; | |
240 | ||
241 | if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift", | |
242 | pmu_interrupt)) { | |
243 | printk(KERN_ERR "pmu_init: can't get irq %d\n", | |
244 | IRQ_MAC_ADB_SR); | |
245 | return -EAGAIN; | |
246 | } | |
247 | if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock", | |
248 | pmu_interrupt)) { | |
249 | printk(KERN_ERR "pmu_init: can't get irq %d\n", | |
250 | IRQ_MAC_ADB_CL); | |
251 | free_irq(IRQ_MAC_ADB_SR, pmu_interrupt); | |
252 | return -EAGAIN; | |
253 | } | |
254 | ||
255 | pmu_fully_inited = 1; | |
256 | ||
257 | /* Enable backlight */ | |
258 | pmu_enable_backlight(1); | |
259 | ||
260 | printk("adb: PMU 68K driver v0.5 for Unified ADB.\n"); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | int | |
266 | pmu_get_model(void) | |
267 | { | |
268 | return pmu_kind; | |
269 | } | |
270 | ||
271 | /* Send an ADB command */ | |
272 | static int | |
273 | pmu_send_request(struct adb_request *req, int sync) | |
274 | { | |
275 | int i, ret; | |
276 | ||
277 | if (!pmu_fully_inited) | |
278 | { | |
279 | req->complete = 1; | |
280 | return -ENXIO; | |
281 | } | |
282 | ||
283 | ret = -EINVAL; | |
284 | ||
285 | switch (req->data[0]) { | |
286 | case PMU_PACKET: | |
287 | for (i = 0; i < req->nbytes - 1; ++i) | |
288 | req->data[i] = req->data[i+1]; | |
289 | --req->nbytes; | |
290 | if (pmu_data_len[req->data[0]][1] != 0) { | |
291 | req->reply[0] = ADB_RET_OK; | |
292 | req->reply_len = 1; | |
293 | } else | |
294 | req->reply_len = 0; | |
295 | ret = pmu_queue_request(req); | |
296 | break; | |
297 | case CUDA_PACKET: | |
298 | switch (req->data[1]) { | |
299 | case CUDA_GET_TIME: | |
300 | if (req->nbytes != 2) | |
301 | break; | |
302 | req->data[0] = PMU_READ_RTC; | |
303 | req->nbytes = 1; | |
304 | req->reply_len = 3; | |
305 | req->reply[0] = CUDA_PACKET; | |
306 | req->reply[1] = 0; | |
307 | req->reply[2] = CUDA_GET_TIME; | |
308 | ret = pmu_queue_request(req); | |
309 | break; | |
310 | case CUDA_SET_TIME: | |
311 | if (req->nbytes != 6) | |
312 | break; | |
313 | req->data[0] = PMU_SET_RTC; | |
314 | req->nbytes = 5; | |
315 | for (i = 1; i <= 4; ++i) | |
316 | req->data[i] = req->data[i+1]; | |
317 | req->reply_len = 3; | |
318 | req->reply[0] = CUDA_PACKET; | |
319 | req->reply[1] = 0; | |
320 | req->reply[2] = CUDA_SET_TIME; | |
321 | ret = pmu_queue_request(req); | |
322 | break; | |
323 | case CUDA_GET_PRAM: | |
324 | if (req->nbytes != 4) | |
325 | break; | |
326 | req->data[0] = PMU_READ_NVRAM; | |
327 | req->data[1] = req->data[2]; | |
328 | req->data[2] = req->data[3]; | |
329 | req->nbytes = 3; | |
330 | req->reply_len = 3; | |
331 | req->reply[0] = CUDA_PACKET; | |
332 | req->reply[1] = 0; | |
333 | req->reply[2] = CUDA_GET_PRAM; | |
334 | ret = pmu_queue_request(req); | |
335 | break; | |
336 | case CUDA_SET_PRAM: | |
337 | if (req->nbytes != 5) | |
338 | break; | |
339 | req->data[0] = PMU_WRITE_NVRAM; | |
340 | req->data[1] = req->data[2]; | |
341 | req->data[2] = req->data[3]; | |
342 | req->data[3] = req->data[4]; | |
343 | req->nbytes = 4; | |
344 | req->reply_len = 3; | |
345 | req->reply[0] = CUDA_PACKET; | |
346 | req->reply[1] = 0; | |
347 | req->reply[2] = CUDA_SET_PRAM; | |
348 | ret = pmu_queue_request(req); | |
349 | break; | |
350 | } | |
351 | break; | |
352 | case ADB_PACKET: | |
353 | for (i = req->nbytes - 1; i > 1; --i) | |
354 | req->data[i+2] = req->data[i]; | |
355 | req->data[3] = req->nbytes - 2; | |
356 | req->data[2] = pmu_adb_flags; | |
357 | /*req->data[1] = req->data[1];*/ | |
358 | req->data[0] = PMU_ADB_CMD; | |
359 | req->nbytes += 2; | |
360 | req->reply_expected = 1; | |
361 | req->reply_len = 0; | |
362 | ret = pmu_queue_request(req); | |
363 | break; | |
364 | } | |
365 | if (ret) | |
366 | { | |
367 | req->complete = 1; | |
368 | return ret; | |
369 | } | |
370 | ||
371 | if (sync) { | |
372 | while (!req->complete) | |
373 | pmu_poll(); | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | /* Enable/disable autopolling */ | |
380 | static int | |
381 | pmu_autopoll(int devs) | |
382 | { | |
383 | struct adb_request req; | |
384 | ||
385 | if (!pmu_fully_inited) return -ENXIO; | |
386 | ||
387 | if (devs) { | |
388 | adb_dev_map = devs; | |
389 | pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86, | |
390 | adb_dev_map >> 8, adb_dev_map); | |
391 | pmu_adb_flags = 2; | |
392 | } else { | |
393 | pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF); | |
394 | pmu_adb_flags = 0; | |
395 | } | |
396 | while (!req.complete) | |
397 | pmu_poll(); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | /* Reset the ADB bus */ | |
402 | static int | |
403 | pmu_reset_bus(void) | |
404 | { | |
405 | struct adb_request req; | |
406 | long timeout; | |
407 | int save_autopoll = adb_dev_map; | |
408 | ||
409 | if (!pmu_fully_inited) return -ENXIO; | |
410 | ||
411 | /* anyone got a better idea?? */ | |
412 | pmu_autopoll(0); | |
413 | ||
414 | req.nbytes = 5; | |
415 | req.done = NULL; | |
416 | req.data[0] = PMU_ADB_CMD; | |
417 | req.data[1] = 0; | |
418 | req.data[2] = 3; /* ADB_BUSRESET ??? */ | |
419 | req.data[3] = 0; | |
420 | req.data[4] = 0; | |
421 | req.reply_len = 0; | |
422 | req.reply_expected = 1; | |
423 | if (pmu_queue_request(&req) != 0) | |
424 | { | |
425 | printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n"); | |
426 | return -EIO; | |
427 | } | |
428 | while (!req.complete) | |
429 | pmu_poll(); | |
430 | timeout = 100000; | |
431 | while (!req.complete) { | |
432 | if (--timeout < 0) { | |
433 | printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n"); | |
434 | return -EIO; | |
435 | } | |
436 | udelay(10); | |
437 | pmu_poll(); | |
438 | } | |
439 | ||
440 | if (save_autopoll != 0) | |
441 | pmu_autopoll(save_autopoll); | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | /* Construct and send a pmu request */ | |
447 | int | |
448 | pmu_request(struct adb_request *req, void (*done)(struct adb_request *), | |
449 | int nbytes, ...) | |
450 | { | |
451 | va_list list; | |
452 | int i; | |
453 | ||
454 | if (nbytes < 0 || nbytes > 32) { | |
455 | printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes); | |
456 | req->complete = 1; | |
457 | return -EINVAL; | |
458 | } | |
459 | req->nbytes = nbytes; | |
460 | req->done = done; | |
461 | va_start(list, nbytes); | |
462 | for (i = 0; i < nbytes; ++i) | |
463 | req->data[i] = va_arg(list, int); | |
464 | va_end(list); | |
465 | if (pmu_data_len[req->data[0]][1] != 0) { | |
466 | req->reply[0] = ADB_RET_OK; | |
467 | req->reply_len = 1; | |
468 | } else | |
469 | req->reply_len = 0; | |
470 | req->reply_expected = 0; | |
471 | return pmu_queue_request(req); | |
472 | } | |
473 | ||
bff832cd | 474 | int |
1da177e4 LT |
475 | pmu_queue_request(struct adb_request *req) |
476 | { | |
477 | unsigned long flags; | |
478 | int nsend; | |
479 | ||
480 | if (req->nbytes <= 0) { | |
481 | req->complete = 1; | |
482 | return 0; | |
483 | } | |
484 | nsend = pmu_data_len[req->data[0]][0]; | |
485 | if (nsend >= 0 && req->nbytes != nsend + 1) { | |
486 | req->complete = 1; | |
487 | return -EINVAL; | |
488 | } | |
489 | ||
a5d361fc | 490 | req->next = NULL; |
1da177e4 LT |
491 | req->sent = 0; |
492 | req->complete = 0; | |
493 | local_irq_save(flags); | |
494 | ||
495 | if (current_req != 0) { | |
496 | last_req->next = req; | |
497 | last_req = req; | |
498 | } else { | |
499 | current_req = req; | |
500 | last_req = req; | |
501 | if (pmu_state == idle) | |
502 | pmu_start(); | |
503 | } | |
504 | ||
505 | local_irq_restore(flags); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static void | |
510 | send_byte(int x) | |
511 | { | |
512 | via1[ACR] |= SR_CTRL; | |
513 | via1[SR] = x; | |
514 | via2[B] &= ~TREQ; /* assert TREQ */ | |
515 | } | |
516 | ||
517 | static void | |
518 | recv_byte(void) | |
519 | { | |
520 | char c; | |
521 | ||
522 | via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT; | |
523 | c = via1[SR]; /* resets SR */ | |
524 | via2[B] &= ~TREQ; | |
525 | } | |
526 | ||
527 | static void | |
528 | pmu_start(void) | |
529 | { | |
530 | unsigned long flags; | |
531 | struct adb_request *req; | |
532 | ||
533 | /* assert pmu_state == idle */ | |
534 | /* get the packet to send */ | |
535 | local_irq_save(flags); | |
536 | req = current_req; | |
537 | if (req == 0 || pmu_state != idle | |
538 | || (req->reply_expected && req_awaiting_reply)) | |
539 | goto out; | |
540 | ||
541 | pmu_state = sending; | |
542 | data_index = 1; | |
543 | data_len = pmu_data_len[req->data[0]][0]; | |
544 | ||
545 | /* set the shift register to shift out and send a byte */ | |
546 | send_byte(req->data[0]); | |
547 | ||
548 | out: | |
549 | local_irq_restore(flags); | |
550 | } | |
551 | ||
552 | void | |
553 | pmu_poll(void) | |
554 | { | |
555 | unsigned long flags; | |
556 | ||
557 | local_irq_save(flags); | |
558 | if (via1[IFR] & SR_INT) { | |
559 | via1[IFR] = SR_INT; | |
2850bc27 | 560 | pmu_interrupt(IRQ_MAC_ADB_SR, NULL); |
1da177e4 LT |
561 | } |
562 | if (via1[IFR] & CB1_INT) { | |
563 | via1[IFR] = CB1_INT; | |
2850bc27 | 564 | pmu_interrupt(IRQ_MAC_ADB_CL, NULL); |
1da177e4 LT |
565 | } |
566 | local_irq_restore(flags); | |
567 | } | |
568 | ||
569 | static irqreturn_t | |
7d12e780 | 570 | pmu_interrupt(int irq, void *dev_id) |
1da177e4 LT |
571 | { |
572 | struct adb_request *req; | |
573 | int timeout, bite = 0; /* to prevent compiler warning */ | |
574 | ||
575 | #if 0 | |
576 | printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n", | |
577 | irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending); | |
578 | #endif | |
579 | ||
580 | if (irq == IRQ_MAC_ADB_CL) { /* CB1 interrupt */ | |
581 | adb_int_pending = 1; | |
582 | } else if (irq == IRQ_MAC_ADB_SR) { /* SR interrupt */ | |
583 | if (via2[B] & TACK) { | |
584 | printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]); | |
585 | } | |
586 | ||
587 | /* if reading grab the byte */ | |
588 | if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR]; | |
589 | ||
590 | /* reset TREQ and wait for TACK to go high */ | |
591 | via2[B] |= TREQ; | |
592 | timeout = 3200; | |
593 | while (!(via2[B] & TACK)) { | |
594 | if (--timeout < 0) { | |
595 | printk(KERN_ERR "PMU not responding (!ack)\n"); | |
596 | goto finish; | |
597 | } | |
598 | udelay(10); | |
599 | } | |
600 | ||
601 | switch (pmu_state) { | |
602 | case sending: | |
603 | req = current_req; | |
604 | if (data_len < 0) { | |
605 | data_len = req->nbytes - 1; | |
606 | send_byte(data_len); | |
607 | break; | |
608 | } | |
609 | if (data_index <= data_len) { | |
610 | send_byte(req->data[data_index++]); | |
611 | break; | |
612 | } | |
613 | req->sent = 1; | |
614 | data_len = pmu_data_len[req->data[0]][1]; | |
615 | if (data_len == 0) { | |
616 | pmu_state = idle; | |
617 | current_req = req->next; | |
618 | if (req->reply_expected) | |
619 | req_awaiting_reply = req; | |
620 | else | |
621 | pmu_done(req); | |
622 | } else { | |
623 | pmu_state = reading; | |
624 | data_index = 0; | |
625 | reply_ptr = req->reply + req->reply_len; | |
626 | recv_byte(); | |
627 | } | |
628 | break; | |
629 | ||
630 | case intack: | |
631 | data_index = 0; | |
632 | data_len = -1; | |
633 | pmu_state = reading_intr; | |
634 | reply_ptr = interrupt_data; | |
635 | recv_byte(); | |
636 | break; | |
637 | ||
638 | case reading: | |
639 | case reading_intr: | |
640 | if (data_len == -1) { | |
641 | data_len = bite; | |
642 | if (bite > 32) | |
643 | printk(KERN_ERR "PMU: bad reply len %d\n", | |
644 | bite); | |
645 | } else { | |
646 | reply_ptr[data_index++] = bite; | |
647 | } | |
648 | if (data_index < data_len) { | |
649 | recv_byte(); | |
650 | break; | |
651 | } | |
652 | ||
653 | if (pmu_state == reading_intr) { | |
7d12e780 | 654 | pmu_handle_data(interrupt_data, data_index); |
1da177e4 LT |
655 | } else { |
656 | req = current_req; | |
657 | current_req = req->next; | |
658 | req->reply_len += data_index; | |
659 | pmu_done(req); | |
660 | } | |
661 | pmu_state = idle; | |
662 | ||
663 | break; | |
664 | ||
665 | default: | |
666 | printk(KERN_ERR "pmu_interrupt: unknown state %d?\n", | |
667 | pmu_state); | |
668 | } | |
669 | } | |
670 | finish: | |
671 | if (pmu_state == idle) { | |
672 | if (adb_int_pending) { | |
673 | pmu_state = intack; | |
674 | send_byte(PMU_INT_ACK); | |
675 | adb_int_pending = 0; | |
676 | } else if (current_req) { | |
677 | pmu_start(); | |
678 | } | |
679 | } | |
680 | ||
681 | #if 0 | |
682 | printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n", | |
683 | pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending); | |
684 | #endif | |
685 | return IRQ_HANDLED; | |
686 | } | |
687 | ||
688 | static void | |
689 | pmu_done(struct adb_request *req) | |
690 | { | |
691 | req->complete = 1; | |
692 | if (req->done) | |
693 | (*req->done)(req); | |
694 | } | |
695 | ||
696 | /* Interrupt data could be the result data from an ADB cmd */ | |
697 | static void | |
7d12e780 | 698 | pmu_handle_data(unsigned char *data, int len) |
1da177e4 LT |
699 | { |
700 | static int show_pmu_ints = 1; | |
701 | ||
702 | asleep = 0; | |
703 | if (len < 1) { | |
704 | adb_int_pending = 0; | |
705 | return; | |
706 | } | |
707 | if (data[0] & PMU_INT_ADB) { | |
708 | if ((data[0] & PMU_INT_ADB_AUTO) == 0) { | |
709 | struct adb_request *req = req_awaiting_reply; | |
710 | if (req == 0) { | |
711 | printk(KERN_ERR "PMU: extra ADB reply\n"); | |
712 | return; | |
713 | } | |
a5d361fc | 714 | req_awaiting_reply = NULL; |
1da177e4 LT |
715 | if (len <= 2) |
716 | req->reply_len = 0; | |
717 | else { | |
718 | memcpy(req->reply, data + 1, len - 1); | |
719 | req->reply_len = len - 1; | |
720 | } | |
721 | pmu_done(req); | |
722 | } else { | |
7d12e780 | 723 | adb_input(data+1, len-1, 1); |
1da177e4 LT |
724 | } |
725 | } else { | |
726 | if (data[0] == 0x08 && len == 3) { | |
727 | /* sound/brightness buttons pressed */ | |
728 | pmu_set_brightness(data[1] >> 3); | |
729 | set_volume(data[2]); | |
730 | } else if (show_pmu_ints | |
731 | && !(data[0] == PMU_INT_TICK && len == 1)) { | |
732 | int i; | |
733 | printk(KERN_DEBUG "pmu intr"); | |
734 | for (i = 0; i < len; ++i) | |
735 | printk(" %.2x", data[i]); | |
736 | printk("\n"); | |
737 | } | |
738 | } | |
739 | } | |
740 | ||
9b4a8dd2 AB |
741 | static int backlight_level = -1; |
742 | static int backlight_enabled = 0; | |
1da177e4 LT |
743 | |
744 | #define LEVEL_TO_BRIGHT(lev) ((lev) < 1? 0x7f: 0x4a - ((lev) << 1)) | |
745 | ||
746 | static void | |
747 | pmu_enable_backlight(int on) | |
748 | { | |
749 | struct adb_request req; | |
750 | ||
751 | if (on) { | |
752 | /* first call: get current backlight value */ | |
753 | if (backlight_level < 0) { | |
754 | switch(pmu_kind) { | |
755 | case PMU_68K_V1: | |
756 | case PMU_68K_V2: | |
757 | pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe); | |
758 | while (!req.complete) | |
759 | pmu_poll(); | |
760 | printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]); | |
761 | backlight_level = req.reply[1]; | |
762 | break; | |
763 | default: | |
764 | backlight_enabled = 0; | |
765 | return; | |
766 | } | |
767 | } | |
768 | pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT, | |
769 | LEVEL_TO_BRIGHT(backlight_level)); | |
770 | while (!req.complete) | |
771 | pmu_poll(); | |
772 | } | |
773 | pmu_request(&req, NULL, 2, PMU_POWER_CTRL, | |
774 | PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF)); | |
775 | while (!req.complete) | |
776 | pmu_poll(); | |
777 | backlight_enabled = on; | |
778 | } | |
779 | ||
780 | static void | |
781 | pmu_set_brightness(int level) | |
782 | { | |
783 | int bright; | |
784 | ||
785 | backlight_level = level; | |
786 | bright = LEVEL_TO_BRIGHT(level); | |
787 | if (!backlight_enabled) | |
788 | return; | |
789 | if (bright_req_1.complete) | |
790 | pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT, | |
791 | bright); | |
792 | if (bright_req_2.complete) | |
793 | pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL, | |
794 | PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF)); | |
795 | } | |
796 | ||
797 | void | |
798 | pmu_enable_irled(int on) | |
799 | { | |
800 | struct adb_request req; | |
801 | ||
802 | pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED | | |
803 | (on ? PMU_POW_ON : PMU_POW_OFF)); | |
804 | while (!req.complete) | |
805 | pmu_poll(); | |
806 | } | |
807 | ||
808 | static void | |
809 | set_volume(int level) | |
810 | { | |
811 | } | |
812 | ||
813 | int | |
814 | pmu_present(void) | |
815 | { | |
816 | return (pmu_kind != PMU_UNKNOWN); | |
817 | } |