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airport: remove useless return in a function returning void
[linux/fpc-iii.git] / arch / powerpc / platforms / powermac / pfunc_core.c
blob96d5ce50364eab840571b216c10819e71834408d
1 /*
2 *
3 * FIXME: Properly make this race free with refcounting etc...
4 *
5 * FIXME: LOCKING !!!
6 */
7
8 #include <linux/init.h>
9 #include <linux/delay.h>
10 #include <linux/kernel.h>
11 #include <linux/spinlock.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14
15 #include <asm/prom.h>
16 #include <asm/pmac_pfunc.h>
17
18 /* Debug */
19 #define LOG_PARSE(fmt...)
20 #define LOG_ERROR(fmt...) printk(fmt)
21 #define LOG_BLOB(t,b,c)
22
23 #undef DEBUG
24 #ifdef DEBUG
25 #define DBG(fmt...) printk(fmt)
26 #else
27 #define DBG(fmt...)
28 #endif
29
30 /* Command numbers */
31 #define PMF_CMD_LIST 0
32 #define PMF_CMD_WRITE_GPIO 1
33 #define PMF_CMD_READ_GPIO 2
34 #define PMF_CMD_WRITE_REG32 3
35 #define PMF_CMD_READ_REG32 4
36 #define PMF_CMD_WRITE_REG16 5
37 #define PMF_CMD_READ_REG16 6
38 #define PMF_CMD_WRITE_REG8 7
39 #define PMF_CMD_READ_REG8 8
40 #define PMF_CMD_DELAY 9
41 #define PMF_CMD_WAIT_REG32 10
42 #define PMF_CMD_WAIT_REG16 11
43 #define PMF_CMD_WAIT_REG8 12
44 #define PMF_CMD_READ_I2C 13
45 #define PMF_CMD_WRITE_I2C 14
46 #define PMF_CMD_RMW_I2C 15
47 #define PMF_CMD_GEN_I2C 16
48 #define PMF_CMD_SHIFT_BYTES_RIGHT 17
49 #define PMF_CMD_SHIFT_BYTES_LEFT 18
50 #define PMF_CMD_READ_CFG 19
51 #define PMF_CMD_WRITE_CFG 20
52 #define PMF_CMD_RMW_CFG 21
53 #define PMF_CMD_READ_I2C_SUBADDR 22
54 #define PMF_CMD_WRITE_I2C_SUBADDR 23
55 #define PMF_CMD_SET_I2C_MODE 24
56 #define PMF_CMD_RMW_I2C_SUBADDR 25
57 #define PMF_CMD_READ_REG32_MASK_SHR_XOR 26
58 #define PMF_CMD_READ_REG16_MASK_SHR_XOR 27
59 #define PMF_CMD_READ_REG8_MASK_SHR_XOR 28
60 #define PMF_CMD_WRITE_REG32_SHL_MASK 29
61 #define PMF_CMD_WRITE_REG16_SHL_MASK 30
62 #define PMF_CMD_WRITE_REG8_SHL_MASK 31
63 #define PMF_CMD_MASK_AND_COMPARE 32
64 #define PMF_CMD_COUNT 33
65
66 /* This structure holds the state of the parser while walking through
67 * a function definition
68 */
69 struct pmf_cmd {
70 const void *cmdptr;
71 const void *cmdend;
72 struct pmf_function *func;
73 void *instdata;
74 struct pmf_args *args;
75 int error;
76 };
77
78 #if 0
79 /* Debug output */
80 static void print_blob(const char *title, const void *blob, int bytes)
81 {
82 printk("%s", title);
83 while(bytes--) {
84 printk("%02x ", *((u8 *)blob));
85 blob += 1;
86 }
87 printk("\n");
88 }
89 #endif
90
91 /*
92 * Parser helpers
93 */
94
95 static u32 pmf_next32(struct pmf_cmd *cmd)
96 {
97 u32 value;
98 if ((cmd->cmdend - cmd->cmdptr) < 4) {
99 cmd->error = 1;
100 return 0;
101 }
102 value = *((u32 *)cmd->cmdptr);
103 cmd->cmdptr += 4;
104 return value;
105 }
106
107 static const void* pmf_next_blob(struct pmf_cmd *cmd, int count)
108 {
109 const void *value;
110 if ((cmd->cmdend - cmd->cmdptr) < count) {
111 cmd->error = 1;
112 return NULL;
113 }
114 value = cmd->cmdptr;
115 cmd->cmdptr += count;
116 return value;
117 }
118
119 /*
120 * Individual command parsers
121 */
122
123 #define PMF_PARSE_CALL(name, cmd, handlers, p...) \
124 do { \
125 if (cmd->error) \
126 return -ENXIO; \
127 if (handlers == NULL) \
128 return 0; \
129 if (handlers->name) \
130 return handlers->name(cmd->func, cmd->instdata, \
131 cmd->args, p); \
132 return -1; \
133 } while(0) \
134
135
136 static int pmf_parser_write_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
137 {
138 u8 value = (u8)pmf_next32(cmd);
139 u8 mask = (u8)pmf_next32(cmd);
140
141 LOG_PARSE("pmf: write_gpio(value: %02x, mask: %02x)\n", value, mask);
142
143 PMF_PARSE_CALL(write_gpio, cmd, h, value, mask);
144 }
145
146 static int pmf_parser_read_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
147 {
148 u8 mask = (u8)pmf_next32(cmd);
149 int rshift = (int)pmf_next32(cmd);
150 u8 xor = (u8)pmf_next32(cmd);
151
152 LOG_PARSE("pmf: read_gpio(mask: %02x, rshift: %d, xor: %02x)\n",
153 mask, rshift, xor);
154
155 PMF_PARSE_CALL(read_gpio, cmd, h, mask, rshift, xor);
156 }
157
158 static int pmf_parser_write_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
159 {
160 u32 offset = pmf_next32(cmd);
161 u32 value = pmf_next32(cmd);
162 u32 mask = pmf_next32(cmd);
163
164 LOG_PARSE("pmf: write_reg32(offset: %08x, value: %08x, mask: %08x)\n",
165 offset, value, mask);
166
167 PMF_PARSE_CALL(write_reg32, cmd, h, offset, value, mask);
168 }
169
170 static int pmf_parser_read_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
171 {
172 u32 offset = pmf_next32(cmd);
173
174 LOG_PARSE("pmf: read_reg32(offset: %08x)\n", offset);
175
176 PMF_PARSE_CALL(read_reg32, cmd, h, offset);
177 }
178
179
180 static int pmf_parser_write_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
181 {
182 u32 offset = pmf_next32(cmd);
183 u16 value = (u16)pmf_next32(cmd);
184 u16 mask = (u16)pmf_next32(cmd);
185
186 LOG_PARSE("pmf: write_reg16(offset: %08x, value: %04x, mask: %04x)\n",
187 offset, value, mask);
188
189 PMF_PARSE_CALL(write_reg16, cmd, h, offset, value, mask);
190 }
191
192 static int pmf_parser_read_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
193 {
194 u32 offset = pmf_next32(cmd);
195
196 LOG_PARSE("pmf: read_reg16(offset: %08x)\n", offset);
197
198 PMF_PARSE_CALL(read_reg16, cmd, h, offset);
199 }
200
201
202 static int pmf_parser_write_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
203 {
204 u32 offset = pmf_next32(cmd);
205 u8 value = (u16)pmf_next32(cmd);
206 u8 mask = (u16)pmf_next32(cmd);
207
208 LOG_PARSE("pmf: write_reg8(offset: %08x, value: %02x, mask: %02x)\n",
209 offset, value, mask);
210
211 PMF_PARSE_CALL(write_reg8, cmd, h, offset, value, mask);
212 }
213
214 static int pmf_parser_read_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
215 {
216 u32 offset = pmf_next32(cmd);
217
218 LOG_PARSE("pmf: read_reg8(offset: %08x)\n", offset);
219
220 PMF_PARSE_CALL(read_reg8, cmd, h, offset);
221 }
222
223 static int pmf_parser_delay(struct pmf_cmd *cmd, struct pmf_handlers *h)
224 {
225 u32 duration = pmf_next32(cmd);
226
227 LOG_PARSE("pmf: delay(duration: %d us)\n", duration);
228
229 PMF_PARSE_CALL(delay, cmd, h, duration);
230 }
231
232 static int pmf_parser_wait_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
233 {
234 u32 offset = pmf_next32(cmd);
235 u32 value = pmf_next32(cmd);
236 u32 mask = pmf_next32(cmd);
237
238 LOG_PARSE("pmf: wait_reg32(offset: %08x, comp_value: %08x,mask: %08x)\n",
239 offset, value, mask);
240
241 PMF_PARSE_CALL(wait_reg32, cmd, h, offset, value, mask);
242 }
243
244 static int pmf_parser_wait_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
245 {
246 u32 offset = pmf_next32(cmd);
247 u16 value = (u16)pmf_next32(cmd);
248 u16 mask = (u16)pmf_next32(cmd);
249
250 LOG_PARSE("pmf: wait_reg16(offset: %08x, comp_value: %04x,mask: %04x)\n",
251 offset, value, mask);
252
253 PMF_PARSE_CALL(wait_reg16, cmd, h, offset, value, mask);
254 }
255
256 static int pmf_parser_wait_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
257 {
258 u32 offset = pmf_next32(cmd);
259 u8 value = (u8)pmf_next32(cmd);
260 u8 mask = (u8)pmf_next32(cmd);
261
262 LOG_PARSE("pmf: wait_reg8(offset: %08x, comp_value: %02x,mask: %02x)\n",
263 offset, value, mask);
264
265 PMF_PARSE_CALL(wait_reg8, cmd, h, offset, value, mask);
266 }
267
268 static int pmf_parser_read_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
269 {
270 u32 bytes = pmf_next32(cmd);
271
272 LOG_PARSE("pmf: read_i2c(bytes: %ud)\n", bytes);
273
274 PMF_PARSE_CALL(read_i2c, cmd, h, bytes);
275 }
276
277 static int pmf_parser_write_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
278 {
279 u32 bytes = pmf_next32(cmd);
280 const void *blob = pmf_next_blob(cmd, bytes);
281
282 LOG_PARSE("pmf: write_i2c(bytes: %ud) ...\n", bytes);
283 LOG_BLOB("pmf: data: \n", blob, bytes);
284
285 PMF_PARSE_CALL(write_i2c, cmd, h, bytes, blob);
286 }
287
288
289 static int pmf_parser_rmw_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
290 {
291 u32 maskbytes = pmf_next32(cmd);
292 u32 valuesbytes = pmf_next32(cmd);
293 u32 totalbytes = pmf_next32(cmd);
294 const void *maskblob = pmf_next_blob(cmd, maskbytes);
295 const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
296
297 LOG_PARSE("pmf: rmw_i2c(maskbytes: %ud, valuebytes: %ud, "
298 "totalbytes: %d) ...\n",
299 maskbytes, valuesbytes, totalbytes);
300 LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
301 LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
302
303 PMF_PARSE_CALL(rmw_i2c, cmd, h, maskbytes, valuesbytes, totalbytes,
304 maskblob, valuesblob);
305 }
306
307 static int pmf_parser_read_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
308 {
309 u32 offset = pmf_next32(cmd);
310 u32 bytes = pmf_next32(cmd);
311
312 LOG_PARSE("pmf: read_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
313
314 PMF_PARSE_CALL(read_cfg, cmd, h, offset, bytes);
315 }
316
317
318 static int pmf_parser_write_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
319 {
320 u32 offset = pmf_next32(cmd);
321 u32 bytes = pmf_next32(cmd);
322 const void *blob = pmf_next_blob(cmd, bytes);
323
324 LOG_PARSE("pmf: write_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
325 LOG_BLOB("pmf: data: \n", blob, bytes);
326
327 PMF_PARSE_CALL(write_cfg, cmd, h, offset, bytes, blob);
328 }
329
330 static int pmf_parser_rmw_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
331 {
332 u32 offset = pmf_next32(cmd);
333 u32 maskbytes = pmf_next32(cmd);
334 u32 valuesbytes = pmf_next32(cmd);
335 u32 totalbytes = pmf_next32(cmd);
336 const void *maskblob = pmf_next_blob(cmd, maskbytes);
337 const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
338
339 LOG_PARSE("pmf: rmw_cfg(maskbytes: %ud, valuebytes: %ud,"
340 " totalbytes: %d) ...\n",
341 maskbytes, valuesbytes, totalbytes);
342 LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
343 LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
344
345 PMF_PARSE_CALL(rmw_cfg, cmd, h, offset, maskbytes, valuesbytes,
346 totalbytes, maskblob, valuesblob);
347 }
348
349
350 static int pmf_parser_read_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
351 {
352 u8 subaddr = (u8)pmf_next32(cmd);
353 u32 bytes = pmf_next32(cmd);
354
355 LOG_PARSE("pmf: read_i2c_sub(subaddr: %x, bytes: %ud)\n",
356 subaddr, bytes);
357
358 PMF_PARSE_CALL(read_i2c_sub, cmd, h, subaddr, bytes);
359 }
360
361 static int pmf_parser_write_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
362 {
363 u8 subaddr = (u8)pmf_next32(cmd);
364 u32 bytes = pmf_next32(cmd);
365 const void *blob = pmf_next_blob(cmd, bytes);
366
367 LOG_PARSE("pmf: write_i2c_sub(subaddr: %x, bytes: %ud) ...\n",
368 subaddr, bytes);
369 LOG_BLOB("pmf: data: \n", blob, bytes);
370
371 PMF_PARSE_CALL(write_i2c_sub, cmd, h, subaddr, bytes, blob);
372 }
373
374 static int pmf_parser_set_i2c_mode(struct pmf_cmd *cmd, struct pmf_handlers *h)
375 {
376 u32 mode = pmf_next32(cmd);
377
378 LOG_PARSE("pmf: set_i2c_mode(mode: %d)\n", mode);
379
380 PMF_PARSE_CALL(set_i2c_mode, cmd, h, mode);
381 }
382
383
384 static int pmf_parser_rmw_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
385 {
386 u8 subaddr = (u8)pmf_next32(cmd);
387 u32 maskbytes = pmf_next32(cmd);
388 u32 valuesbytes = pmf_next32(cmd);
389 u32 totalbytes = pmf_next32(cmd);
390 const void *maskblob = pmf_next_blob(cmd, maskbytes);
391 const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
392
393 LOG_PARSE("pmf: rmw_i2c_sub(subaddr: %x, maskbytes: %ud, valuebytes: %ud"
394 ", totalbytes: %d) ...\n",
395 subaddr, maskbytes, valuesbytes, totalbytes);
396 LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
397 LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
398
399 PMF_PARSE_CALL(rmw_i2c_sub, cmd, h, subaddr, maskbytes, valuesbytes,
400 totalbytes, maskblob, valuesblob);
401 }
402
403 static int pmf_parser_read_reg32_msrx(struct pmf_cmd *cmd,
404 struct pmf_handlers *h)
405 {
406 u32 offset = pmf_next32(cmd);
407 u32 mask = pmf_next32(cmd);
408 u32 shift = pmf_next32(cmd);
409 u32 xor = pmf_next32(cmd);
410
411 LOG_PARSE("pmf: read_reg32_msrx(offset: %x, mask: %x, shift: %x,"
412 " xor: %x\n", offset, mask, shift, xor);
413
414 PMF_PARSE_CALL(read_reg32_msrx, cmd, h, offset, mask, shift, xor);
415 }
416
417 static int pmf_parser_read_reg16_msrx(struct pmf_cmd *cmd,
418 struct pmf_handlers *h)
419 {
420 u32 offset = pmf_next32(cmd);
421 u32 mask = pmf_next32(cmd);
422 u32 shift = pmf_next32(cmd);
423 u32 xor = pmf_next32(cmd);
424
425 LOG_PARSE("pmf: read_reg16_msrx(offset: %x, mask: %x, shift: %x,"
426 " xor: %x\n", offset, mask, shift, xor);
427
428 PMF_PARSE_CALL(read_reg16_msrx, cmd, h, offset, mask, shift, xor);
429 }
430 static int pmf_parser_read_reg8_msrx(struct pmf_cmd *cmd,
431 struct pmf_handlers *h)
432 {
433 u32 offset = pmf_next32(cmd);
434 u32 mask = pmf_next32(cmd);
435 u32 shift = pmf_next32(cmd);
436 u32 xor = pmf_next32(cmd);
437
438 LOG_PARSE("pmf: read_reg8_msrx(offset: %x, mask: %x, shift: %x,"
439 " xor: %x\n", offset, mask, shift, xor);
440
441 PMF_PARSE_CALL(read_reg8_msrx, cmd, h, offset, mask, shift, xor);
442 }
443
444 static int pmf_parser_write_reg32_slm(struct pmf_cmd *cmd,
445 struct pmf_handlers *h)
446 {
447 u32 offset = pmf_next32(cmd);
448 u32 shift = pmf_next32(cmd);
449 u32 mask = pmf_next32(cmd);
450
451 LOG_PARSE("pmf: write_reg32_slm(offset: %x, shift: %x, mask: %x\n",
452 offset, shift, mask);
453
454 PMF_PARSE_CALL(write_reg32_slm, cmd, h, offset, shift, mask);
455 }
456
457 static int pmf_parser_write_reg16_slm(struct pmf_cmd *cmd,
458 struct pmf_handlers *h)
459 {
460 u32 offset = pmf_next32(cmd);
461 u32 shift = pmf_next32(cmd);
462 u32 mask = pmf_next32(cmd);
463
464 LOG_PARSE("pmf: write_reg16_slm(offset: %x, shift: %x, mask: %x\n",
465 offset, shift, mask);
466
467 PMF_PARSE_CALL(write_reg16_slm, cmd, h, offset, shift, mask);
468 }
469
470 static int pmf_parser_write_reg8_slm(struct pmf_cmd *cmd,
471 struct pmf_handlers *h)
472 {
473 u32 offset = pmf_next32(cmd);
474 u32 shift = pmf_next32(cmd);
475 u32 mask = pmf_next32(cmd);
476
477 LOG_PARSE("pmf: write_reg8_slm(offset: %x, shift: %x, mask: %x\n",
478 offset, shift, mask);
479
480 PMF_PARSE_CALL(write_reg8_slm, cmd, h, offset, shift, mask);
481 }
482
483 static int pmf_parser_mask_and_compare(struct pmf_cmd *cmd,
484 struct pmf_handlers *h)
485 {
486 u32 bytes = pmf_next32(cmd);
487 const void *maskblob = pmf_next_blob(cmd, bytes);
488 const void *valuesblob = pmf_next_blob(cmd, bytes);
489
490 LOG_PARSE("pmf: mask_and_compare(length: %ud ...\n", bytes);
491 LOG_BLOB("pmf: mask data: \n", maskblob, bytes);
492 LOG_BLOB("pmf: values data: \n", valuesblob, bytes);
493
494 PMF_PARSE_CALL(mask_and_compare, cmd, h,
495 bytes, maskblob, valuesblob);
496 }
497
498
499 typedef int (*pmf_cmd_parser_t)(struct pmf_cmd *cmd, struct pmf_handlers *h);
500
501 static pmf_cmd_parser_t pmf_parsers[PMF_CMD_COUNT] =
502 {
503 NULL,
504 pmf_parser_write_gpio,
505 pmf_parser_read_gpio,
506 pmf_parser_write_reg32,
507 pmf_parser_read_reg32,
508 pmf_parser_write_reg16,
509 pmf_parser_read_reg16,
510 pmf_parser_write_reg8,
511 pmf_parser_read_reg8,
512 pmf_parser_delay,
513 pmf_parser_wait_reg32,
514 pmf_parser_wait_reg16,
515 pmf_parser_wait_reg8,
516 pmf_parser_read_i2c,
517 pmf_parser_write_i2c,
518 pmf_parser_rmw_i2c,
519 NULL, /* Bogus command */
520 NULL, /* Shift bytes right: NYI */
521 NULL, /* Shift bytes left: NYI */
522 pmf_parser_read_cfg,
523 pmf_parser_write_cfg,
524 pmf_parser_rmw_cfg,
525 pmf_parser_read_i2c_sub,
526 pmf_parser_write_i2c_sub,
527 pmf_parser_set_i2c_mode,
528 pmf_parser_rmw_i2c_sub,
529 pmf_parser_read_reg32_msrx,
530 pmf_parser_read_reg16_msrx,
531 pmf_parser_read_reg8_msrx,
532 pmf_parser_write_reg32_slm,
533 pmf_parser_write_reg16_slm,
534 pmf_parser_write_reg8_slm,
535 pmf_parser_mask_and_compare,
536 };
537
538 struct pmf_device {
539 struct list_head link;
540 struct device_node *node;
541 struct pmf_handlers *handlers;
542 struct list_head functions;
543 struct kref ref;
544 };
545
546 static LIST_HEAD(pmf_devices);
547 static DEFINE_SPINLOCK(pmf_lock);
548 static DEFINE_MUTEX(pmf_irq_mutex);
549
550 static void pmf_release_device(struct kref *kref)
551 {
552 struct pmf_device *dev = container_of(kref, struct pmf_device, ref);
553 kfree(dev);
554 }
555
556 static inline void pmf_put_device(struct pmf_device *dev)
557 {
558 kref_put(&dev->ref, pmf_release_device);
559 }
560
561 static inline struct pmf_device *pmf_get_device(struct pmf_device *dev)
562 {
563 kref_get(&dev->ref);
564 return dev;
565 }
566
567 static inline struct pmf_device *pmf_find_device(struct device_node *np)
568 {
569 struct pmf_device *dev;
570
571 list_for_each_entry(dev, &pmf_devices, link) {
572 if (dev->node == np)
573 return pmf_get_device(dev);
574 }
575 return NULL;
576 }
577
578 static int pmf_parse_one(struct pmf_function *func,
579 struct pmf_handlers *handlers,
580 void *instdata, struct pmf_args *args)
581 {
582 struct pmf_cmd cmd;
583 u32 ccode;
584 int count, rc;
585
586 cmd.cmdptr = func->data;
587 cmd.cmdend = func->data + func->length;
588 cmd.func = func;
589 cmd.instdata = instdata;
590 cmd.args = args;
591 cmd.error = 0;
592
593 LOG_PARSE("pmf: func %s, %d bytes, %s...\n",
594 func->name, func->length,
595 handlers ? "executing" : "parsing");
596
597 /* One subcommand to parse for now */
598 count = 1;
599
600 while(count-- && cmd.cmdptr < cmd.cmdend) {
601 /* Get opcode */
602 ccode = pmf_next32(&cmd);
603 /* Check if we are hitting a command list, fetch new count */
604 if (ccode == 0) {
605 count = pmf_next32(&cmd) - 1;
606 ccode = pmf_next32(&cmd);
607 }
608 if (cmd.error) {
609 LOG_ERROR("pmf: parse error, not enough data\n");
610 return -ENXIO;
611 }
612 if (ccode >= PMF_CMD_COUNT) {
613 LOG_ERROR("pmf: command code %d unknown !\n", ccode);
614 return -ENXIO;
615 }
616 if (pmf_parsers[ccode] == NULL) {
617 LOG_ERROR("pmf: no parser for command %d !\n", ccode);
618 return -ENXIO;
619 }
620 rc = pmf_parsers[ccode](&cmd, handlers);
621 if (rc != 0) {
622 LOG_ERROR("pmf: parser for command %d returned"
623 " error %d\n", ccode, rc);
624 return rc;
625 }
626 }
627
628 /* We are doing an initial parse pass, we need to adjust the size */
629 if (handlers == NULL)
630 func->length = cmd.cmdptr - func->data;
631
632 return 0;
633 }
634
635 static int pmf_add_function_prop(struct pmf_device *dev, void *driverdata,
636 const char *name, u32 *data,
637 unsigned int length)
638 {
639 int count = 0;
640 struct pmf_function *func = NULL;
641
642 DBG("pmf: Adding functions for platform-do-%s\n", name);
643
644 while (length >= 12) {
645 /* Allocate a structure */
646 func = kzalloc(sizeof(struct pmf_function), GFP_KERNEL);
647 if (func == NULL)
648 goto bail;
649 kref_init(&func->ref);
650 INIT_LIST_HEAD(&func->irq_clients);
651 func->node = dev->node;
652 func->driver_data = driverdata;
653 func->name = name;
654 func->phandle = data[0];
655 func->flags = data[1];
656 data += 2;
657 length -= 8;
658 func->data = data;
659 func->length = length;
660 func->dev = dev;
661 DBG("pmf: idx %d: flags=%08x, phandle=%08x "
662 " %d bytes remaining, parsing...\n",
663 count+1, func->flags, func->phandle, length);
664 if (pmf_parse_one(func, NULL, NULL, NULL)) {
665 kfree(func);
666 goto bail;
667 }
668 length -= func->length;
669 data = (u32 *)(((u8 *)data) + func->length);
670 list_add(&func->link, &dev->functions);
671 pmf_get_device(dev);
672 count++;
673 }
674 bail:
675 DBG("pmf: Added %d functions\n", count);
676
677 return count;
678 }
679
680 static int pmf_add_functions(struct pmf_device *dev, void *driverdata)
681 {
682 struct property *pp;
683 #define PP_PREFIX "platform-do-"
684 const int plen = strlen(PP_PREFIX);
685 int count = 0;
686
687 for (pp = dev->node->properties; pp != 0; pp = pp->next) {
688 char *name;
689 if (strncmp(pp->name, PP_PREFIX, plen) != 0)
690 continue;
691 name = pp->name + plen;
692 if (strlen(name) && pp->length >= 12)
693 count += pmf_add_function_prop(dev, driverdata, name,
694 pp->value, pp->length);
695 }
696 return count;
697 }
698
699
700 int pmf_register_driver(struct device_node *np,
701 struct pmf_handlers *handlers,
702 void *driverdata)
703 {
704 struct pmf_device *dev;
705 unsigned long flags;
706 int rc = 0;
707
708 if (handlers == NULL)
709 return -EINVAL;
710
711 DBG("pmf: registering driver for node %s\n", np->full_name);
712
713 spin_lock_irqsave(&pmf_lock, flags);
714 dev = pmf_find_device(np);
715 spin_unlock_irqrestore(&pmf_lock, flags);
716 if (dev != NULL) {
717 DBG("pmf: already there !\n");
718 pmf_put_device(dev);
719 return -EBUSY;
720 }
721
722 dev = kzalloc(sizeof(struct pmf_device), GFP_KERNEL);
723 if (dev == NULL) {
724 DBG("pmf: no memory !\n");
725 return -ENOMEM;
726 }
727 kref_init(&dev->ref);
728 dev->node = of_node_get(np);
729 dev->handlers = handlers;
730 INIT_LIST_HEAD(&dev->functions);
731
732 rc = pmf_add_functions(dev, driverdata);
733 if (rc == 0) {
734 DBG("pmf: no functions, disposing.. \n");
735 of_node_put(np);
736 kfree(dev);
737 return -ENODEV;
738 }
739
740 spin_lock_irqsave(&pmf_lock, flags);
741 list_add(&dev->link, &pmf_devices);
742 spin_unlock_irqrestore(&pmf_lock, flags);
743
744 return 0;
745 }
746 EXPORT_SYMBOL_GPL(pmf_register_driver);
747
748 struct pmf_function *pmf_get_function(struct pmf_function *func)
749 {
750 if (!try_module_get(func->dev->handlers->owner))
751 return NULL;
752 kref_get(&func->ref);
753 return func;
754 }
755 EXPORT_SYMBOL_GPL(pmf_get_function);
756
757 static void pmf_release_function(struct kref *kref)
758 {
759 struct pmf_function *func =
760 container_of(kref, struct pmf_function, ref);
761 pmf_put_device(func->dev);
762 kfree(func);
763 }
764
765 static inline void __pmf_put_function(struct pmf_function *func)
766 {
767 kref_put(&func->ref, pmf_release_function);
768 }
769
770 void pmf_put_function(struct pmf_function *func)
771 {
772 if (func == NULL)
773 return;
774 module_put(func->dev->handlers->owner);
775 __pmf_put_function(func);
776 }
777 EXPORT_SYMBOL_GPL(pmf_put_function);
778
779 void pmf_unregister_driver(struct device_node *np)
780 {
781 struct pmf_device *dev;
782 unsigned long flags;
783
784 DBG("pmf: unregistering driver for node %s\n", np->full_name);
785
786 spin_lock_irqsave(&pmf_lock, flags);
787 dev = pmf_find_device(np);
788 if (dev == NULL) {
789 DBG("pmf: not such driver !\n");
790 spin_unlock_irqrestore(&pmf_lock, flags);
791 return;
792 }
793 list_del(&dev->link);
794
795 while(!list_empty(&dev->functions)) {
796 struct pmf_function *func =
797 list_entry(dev->functions.next, typeof(*func), link);
798 list_del(&func->link);
799 __pmf_put_function(func);
800 }
801
802 pmf_put_device(dev);
803 spin_unlock_irqrestore(&pmf_lock, flags);
804 }
805 EXPORT_SYMBOL_GPL(pmf_unregister_driver);
806
807 struct pmf_function *__pmf_find_function(struct device_node *target,
808 const char *name, u32 flags)
809 {
810 struct device_node *actor = of_node_get(target);
811 struct pmf_device *dev;
812 struct pmf_function *func, *result = NULL;
813 char fname[64];
814 const u32 *prop;
815 u32 ph;
816
817 /*
818 * Look for a "platform-*" function reference. If we can't find
819 * one, then we fallback to a direct call attempt
820 */
821 snprintf(fname, 63, "platform-%s", name);
822 prop = of_get_property(target, fname, NULL);
823 if (prop == NULL)
824 goto find_it;
825 ph = *prop;
826 if (ph == 0)
827 goto find_it;
828
829 /*
830 * Ok, now try to find the actor. If we can't find it, we fail,
831 * there is no point in falling back there
832 */
833 of_node_put(actor);
834 actor = of_find_node_by_phandle(ph);
835 if (actor == NULL)
836 return NULL;
837 find_it:
838 dev = pmf_find_device(actor);
839 if (dev == NULL)
840 return NULL;
841
842 list_for_each_entry(func, &dev->functions, link) {
843 if (name && strcmp(name, func->name))
844 continue;
845 if (func->phandle && target->node != func->phandle)
846 continue;
847 if ((func->flags & flags) == 0)
848 continue;
849 result = func;
850 break;
851 }
852 of_node_put(actor);
853 pmf_put_device(dev);
854 return result;
855 }
856
857
858 int pmf_register_irq_client(struct device_node *target,
859 const char *name,
860 struct pmf_irq_client *client)
861 {
862 struct pmf_function *func;
863 unsigned long flags;
864
865 spin_lock_irqsave(&pmf_lock, flags);
866 func = __pmf_find_function(target, name, PMF_FLAGS_INT_GEN);
867 if (func)
868 func = pmf_get_function(func);
869 spin_unlock_irqrestore(&pmf_lock, flags);
870 if (func == NULL)
871 return -ENODEV;
872
873 /* guard against manipulations of list */
874 mutex_lock(&pmf_irq_mutex);
875 if (list_empty(&func->irq_clients))
876 func->dev->handlers->irq_enable(func);
877
878 /* guard against pmf_do_irq while changing list */
879 spin_lock_irqsave(&pmf_lock, flags);
880 list_add(&client->link, &func->irq_clients);
881 spin_unlock_irqrestore(&pmf_lock, flags);
882
883 client->func = func;
884 mutex_unlock(&pmf_irq_mutex);
885
886 return 0;
887 }
888 EXPORT_SYMBOL_GPL(pmf_register_irq_client);
889
890 void pmf_unregister_irq_client(struct pmf_irq_client *client)
891 {
892 struct pmf_function *func = client->func;
893 unsigned long flags;
894
895 BUG_ON(func == NULL);
896
897 /* guard against manipulations of list */
898 mutex_lock(&pmf_irq_mutex);
899 client->func = NULL;
900
901 /* guard against pmf_do_irq while changing list */
902 spin_lock_irqsave(&pmf_lock, flags);
903 list_del(&client->link);
904 spin_unlock_irqrestore(&pmf_lock, flags);
905
906 if (list_empty(&func->irq_clients))
907 func->dev->handlers->irq_disable(func);
908 mutex_unlock(&pmf_irq_mutex);
909 pmf_put_function(func);
910 }
911 EXPORT_SYMBOL_GPL(pmf_unregister_irq_client);
912
913
914 void pmf_do_irq(struct pmf_function *func)
915 {
916 unsigned long flags;
917 struct pmf_irq_client *client;
918
919 /* For now, using a spinlock over the whole function. Can be made
920 * to drop the lock using 2 lists if necessary
921 */
922 spin_lock_irqsave(&pmf_lock, flags);
923 list_for_each_entry(client, &func->irq_clients, link) {
924 if (!try_module_get(client->owner))
925 continue;
926 client->handler(client->data);
927 module_put(client->owner);
928 }
929 spin_unlock_irqrestore(&pmf_lock, flags);
930 }
931 EXPORT_SYMBOL_GPL(pmf_do_irq);
932
933
934 int pmf_call_one(struct pmf_function *func, struct pmf_args *args)
935 {
936 struct pmf_device *dev = func->dev;
937 void *instdata = NULL;
938 int rc = 0;
939
940 DBG(" ** pmf_call_one(%s/%s) **\n", dev->node->full_name, func->name);
941
942 if (dev->handlers->begin)
943 instdata = dev->handlers->begin(func, args);
944 rc = pmf_parse_one(func, dev->handlers, instdata, args);
945 if (dev->handlers->end)
946 dev->handlers->end(func, instdata);
947
948 return rc;
949 }
950 EXPORT_SYMBOL_GPL(pmf_call_one);
951
952 int pmf_do_functions(struct device_node *np, const char *name,
953 u32 phandle, u32 fflags, struct pmf_args *args)
954 {
955 struct pmf_device *dev;
956 struct pmf_function *func, *tmp;
957 unsigned long flags;
958 int rc = -ENODEV;
959
960 spin_lock_irqsave(&pmf_lock, flags);
961
962 dev = pmf_find_device(np);
963 if (dev == NULL) {
964 spin_unlock_irqrestore(&pmf_lock, flags);
965 return -ENODEV;
966 }
967 list_for_each_entry_safe(func, tmp, &dev->functions, link) {
968 if (name && strcmp(name, func->name))
969 continue;
970 if (phandle && func->phandle && phandle != func->phandle)
971 continue;
972 if ((func->flags & fflags) == 0)
973 continue;
974 if (pmf_get_function(func) == NULL)
975 continue;
976 spin_unlock_irqrestore(&pmf_lock, flags);
977 rc = pmf_call_one(func, args);
978 pmf_put_function(func);
979 spin_lock_irqsave(&pmf_lock, flags);
980 }
981 pmf_put_device(dev);
982 spin_unlock_irqrestore(&pmf_lock, flags);
983
984 return rc;
985 }
986 EXPORT_SYMBOL_GPL(pmf_do_functions);
987
988
989 struct pmf_function *pmf_find_function(struct device_node *target,
990 const char *name)
991 {
992 struct pmf_function *func;
993 unsigned long flags;
994
995 spin_lock_irqsave(&pmf_lock, flags);
996 func = __pmf_find_function(target, name, PMF_FLAGS_ON_DEMAND);
997 if (func)
998 func = pmf_get_function(func);
999 spin_unlock_irqrestore(&pmf_lock, flags);
1000 return func;
1001 }
1002 EXPORT_SYMBOL_GPL(pmf_find_function);
1003
1004 int pmf_call_function(struct device_node *target, const char *name,
1005 struct pmf_args *args)
1006 {
1007 struct pmf_function *func = pmf_find_function(target, name);
1008 int rc;
1009
1010 if (func == NULL)
1011 return -ENODEV;
1012
1013 rc = pmf_call_one(func, args);
1014 pmf_put_function(func);
1015 return rc;
1016 }
1017 EXPORT_SYMBOL_GPL(pmf_call_function);
1018
Linux with added FPC-III support