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Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/i2c-2.6
[deliverable/linux.git] / arch / powerpc / platforms / powermac / pfunc_core.c
1 /*
2 *
3 * FIXME: Properly make this race free with refcounting etc...
4 *
5 * FIXME: LOCKING !!!
6 */
7
8 #include <linux/config.h>
9 #include <linux/init.h>
10 #include <linux/delay.h>
11 #include <linux/kernel.h>
12 #include <linux/spinlock.h>
13 #include <linux/module.h>
14 #include <linux/mutex.h>
15
16 #include <asm/semaphore.h>
17 #include <asm/prom.h>
18 #include <asm/pmac_pfunc.h>
19
20 /* Debug */
21 #define LOG_PARSE(fmt...)
22 #define LOG_ERROR(fmt...) printk(fmt)
23 #define LOG_BLOB(t,b,c)
24
25 #undef DEBUG
26 #ifdef DEBUG
27 #define DBG(fmt...) printk(fmt)
28 #else
29 #define DBG(fmt...)
30 #endif
31
32 /* Command numbers */
33 #define PMF_CMD_LIST 0
34 #define PMF_CMD_WRITE_GPIO 1
35 #define PMF_CMD_READ_GPIO 2
36 #define PMF_CMD_WRITE_REG32 3
37 #define PMF_CMD_READ_REG32 4
38 #define PMF_CMD_WRITE_REG16 5
39 #define PMF_CMD_READ_REG16 6
40 #define PMF_CMD_WRITE_REG8 7
41 #define PMF_CMD_READ_REG8 8
42 #define PMF_CMD_DELAY 9
43 #define PMF_CMD_WAIT_REG32 10
44 #define PMF_CMD_WAIT_REG16 11
45 #define PMF_CMD_WAIT_REG8 12
46 #define PMF_CMD_READ_I2C 13
47 #define PMF_CMD_WRITE_I2C 14
48 #define PMF_CMD_RMW_I2C 15
49 #define PMF_CMD_GEN_I2C 16
50 #define PMF_CMD_SHIFT_BYTES_RIGHT 17
51 #define PMF_CMD_SHIFT_BYTES_LEFT 18
52 #define PMF_CMD_READ_CFG 19
53 #define PMF_CMD_WRITE_CFG 20
54 #define PMF_CMD_RMW_CFG 21
55 #define PMF_CMD_READ_I2C_SUBADDR 22
56 #define PMF_CMD_WRITE_I2C_SUBADDR 23
57 #define PMF_CMD_SET_I2C_MODE 24
58 #define PMF_CMD_RMW_I2C_SUBADDR 25
59 #define PMF_CMD_READ_REG32_MASK_SHR_XOR 26
60 #define PMF_CMD_READ_REG16_MASK_SHR_XOR 27
61 #define PMF_CMD_READ_REG8_MASK_SHR_XOR 28
62 #define PMF_CMD_WRITE_REG32_SHL_MASK 29
63 #define PMF_CMD_WRITE_REG16_SHL_MASK 30
64 #define PMF_CMD_WRITE_REG8_SHL_MASK 31
65 #define PMF_CMD_MASK_AND_COMPARE 32
66 #define PMF_CMD_COUNT 33
67
68 /* This structure holds the state of the parser while walking through
69 * a function definition
70 */
71 struct pmf_cmd {
72 const void *cmdptr;
73 const void *cmdend;
74 struct pmf_function *func;
75 void *instdata;
76 struct pmf_args *args;
77 int error;
78 };
79
80 #if 0
81 /* Debug output */
82 static void print_blob(const char *title, const void *blob, int bytes)
83 {
84 printk("%s", title);
85 while(bytes--) {
86 printk("%02x ", *((u8 *)blob));
87 blob += 1;
88 }
89 printk("\n");
90 }
91 #endif
92
93 /*
94 * Parser helpers
95 */
96
97 static u32 pmf_next32(struct pmf_cmd *cmd)
98 {
99 u32 value;
100 if ((cmd->cmdend - cmd->cmdptr) < 4) {
101 cmd->error = 1;
102 return 0;
103 }
104 value = *((u32 *)cmd->cmdptr);
105 cmd->cmdptr += 4;
106 return value;
107 }
108
109 static const void* pmf_next_blob(struct pmf_cmd *cmd, int count)
110 {
111 const void *value;
112 if ((cmd->cmdend - cmd->cmdptr) < count) {
113 cmd->error = 1;
114 return NULL;
115 }
116 value = cmd->cmdptr;
117 cmd->cmdptr += count;
118 return value;
119 }
120
121 /*
122 * Individual command parsers
123 */
124
125 #define PMF_PARSE_CALL(name, cmd, handlers, p...) \
126 do { \
127 if (cmd->error) \
128 return -ENXIO; \
129 if (handlers == NULL) \
130 return 0; \
131 if (handlers->name) \
132 return handlers->name(cmd->func, cmd->instdata, \
133 cmd->args, p); \
134 return -1; \
135 } while(0) \
136
137
138 static int pmf_parser_write_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
139 {
140 u8 value = (u8)pmf_next32(cmd);
141 u8 mask = (u8)pmf_next32(cmd);
142
143 LOG_PARSE("pmf: write_gpio(value: %02x, mask: %02x)\n", value, mask);
144
145 PMF_PARSE_CALL(write_gpio, cmd, h, value, mask);
146 }
147
148 static int pmf_parser_read_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
149 {
150 u8 mask = (u8)pmf_next32(cmd);
151 int rshift = (int)pmf_next32(cmd);
152 u8 xor = (u8)pmf_next32(cmd);
153
154 LOG_PARSE("pmf: read_gpio(mask: %02x, rshift: %d, xor: %02x)\n",
155 mask, rshift, xor);
156
157 PMF_PARSE_CALL(read_gpio, cmd, h, mask, rshift, xor);
158 }
159
160 static int pmf_parser_write_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
161 {
162 u32 offset = pmf_next32(cmd);
163 u32 value = pmf_next32(cmd);
164 u32 mask = pmf_next32(cmd);
165
166 LOG_PARSE("pmf: write_reg32(offset: %08x, value: %08x, mask: %08x)\n",
167 offset, value, mask);
168
169 PMF_PARSE_CALL(write_reg32, cmd, h, offset, value, mask);
170 }
171
172 static int pmf_parser_read_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
173 {
174 u32 offset = pmf_next32(cmd);
175
176 LOG_PARSE("pmf: read_reg32(offset: %08x)\n", offset);
177
178 PMF_PARSE_CALL(read_reg32, cmd, h, offset);
179 }
180
181
182 static int pmf_parser_write_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
183 {
184 u32 offset = pmf_next32(cmd);
185 u16 value = (u16)pmf_next32(cmd);
186 u16 mask = (u16)pmf_next32(cmd);
187
188 LOG_PARSE("pmf: write_reg16(offset: %08x, value: %04x, mask: %04x)\n",
189 offset, value, mask);
190
191 PMF_PARSE_CALL(write_reg16, cmd, h, offset, value, mask);
192 }
193
194 static int pmf_parser_read_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
195 {
196 u32 offset = pmf_next32(cmd);
197
198 LOG_PARSE("pmf: read_reg16(offset: %08x)\n", offset);
199
200 PMF_PARSE_CALL(read_reg16, cmd, h, offset);
201 }
202
203
204 static int pmf_parser_write_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
205 {
206 u32 offset = pmf_next32(cmd);
207 u8 value = (u16)pmf_next32(cmd);
208 u8 mask = (u16)pmf_next32(cmd);
209
210 LOG_PARSE("pmf: write_reg8(offset: %08x, value: %02x, mask: %02x)\n",
211 offset, value, mask);
212
213 PMF_PARSE_CALL(write_reg8, cmd, h, offset, value, mask);
214 }
215
216 static int pmf_parser_read_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
217 {
218 u32 offset = pmf_next32(cmd);
219
220 LOG_PARSE("pmf: read_reg8(offset: %08x)\n", offset);
221
222 PMF_PARSE_CALL(read_reg8, cmd, h, offset);
223 }
224
225 static int pmf_parser_delay(struct pmf_cmd *cmd, struct pmf_handlers *h)
226 {
227 u32 duration = pmf_next32(cmd);
228
229 LOG_PARSE("pmf: delay(duration: %d us)\n", duration);
230
231 PMF_PARSE_CALL(delay, cmd, h, duration);
232 }
233
234 static int pmf_parser_wait_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
235 {
236 u32 offset = pmf_next32(cmd);
237 u32 value = pmf_next32(cmd);
238 u32 mask = pmf_next32(cmd);
239
240 LOG_PARSE("pmf: wait_reg32(offset: %08x, comp_value: %08x,mask: %08x)\n",
241 offset, value, mask);
242
243 PMF_PARSE_CALL(wait_reg32, cmd, h, offset, value, mask);
244 }
245
246 static int pmf_parser_wait_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
247 {
248 u32 offset = pmf_next32(cmd);
249 u16 value = (u16)pmf_next32(cmd);
250 u16 mask = (u16)pmf_next32(cmd);
251
252 LOG_PARSE("pmf: wait_reg16(offset: %08x, comp_value: %04x,mask: %04x)\n",
253 offset, value, mask);
254
255 PMF_PARSE_CALL(wait_reg16, cmd, h, offset, value, mask);
256 }
257
258 static int pmf_parser_wait_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
259 {
260 u32 offset = pmf_next32(cmd);
261 u8 value = (u8)pmf_next32(cmd);
262 u8 mask = (u8)pmf_next32(cmd);
263
264 LOG_PARSE("pmf: wait_reg8(offset: %08x, comp_value: %02x,mask: %02x)\n",
265 offset, value, mask);
266
267 PMF_PARSE_CALL(wait_reg8, cmd, h, offset, value, mask);
268 }
269
270 static int pmf_parser_read_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
271 {
272 u32 bytes = pmf_next32(cmd);
273
274 LOG_PARSE("pmf: read_i2c(bytes: %ud)\n", bytes);
275
276 PMF_PARSE_CALL(read_i2c, cmd, h, bytes);
277 }
278
279 static int pmf_parser_write_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
280 {
281 u32 bytes = pmf_next32(cmd);
282 const void *blob = pmf_next_blob(cmd, bytes);
283
284 LOG_PARSE("pmf: write_i2c(bytes: %ud) ...\n", bytes);
285 LOG_BLOB("pmf: data: \n", blob, bytes);
286
287 PMF_PARSE_CALL(write_i2c, cmd, h, bytes, blob);
288 }
289
290
291 static int pmf_parser_rmw_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
292 {
293 u32 maskbytes = pmf_next32(cmd);
294 u32 valuesbytes = pmf_next32(cmd);
295 u32 totalbytes = pmf_next32(cmd);
296 const void *maskblob = pmf_next_blob(cmd, maskbytes);
297 const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
298
299 LOG_PARSE("pmf: rmw_i2c(maskbytes: %ud, valuebytes: %ud, "
300 "totalbytes: %d) ...\n",
301 maskbytes, valuesbytes, totalbytes);
302 LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
303 LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
304
305 PMF_PARSE_CALL(rmw_i2c, cmd, h, maskbytes, valuesbytes, totalbytes,
306 maskblob, valuesblob);
307 }
308
309 static int pmf_parser_read_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
310 {
311 u32 offset = pmf_next32(cmd);
312 u32 bytes = pmf_next32(cmd);
313
314 LOG_PARSE("pmf: read_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
315
316 PMF_PARSE_CALL(read_cfg, cmd, h, offset, bytes);
317 }
318
319
320 static int pmf_parser_write_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
321 {
322 u32 offset = pmf_next32(cmd);
323 u32 bytes = pmf_next32(cmd);
324 const void *blob = pmf_next_blob(cmd, bytes);
325
326 LOG_PARSE("pmf: write_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
327 LOG_BLOB("pmf: data: \n", blob, bytes);
328
329 PMF_PARSE_CALL(write_cfg, cmd, h, offset, bytes, blob);
330 }
331
332 static int pmf_parser_rmw_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
333 {
334 u32 offset = pmf_next32(cmd);
335 u32 maskbytes = pmf_next32(cmd);
336 u32 valuesbytes = pmf_next32(cmd);
337 u32 totalbytes = pmf_next32(cmd);
338 const void *maskblob = pmf_next_blob(cmd, maskbytes);
339 const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
340
341 LOG_PARSE("pmf: rmw_cfg(maskbytes: %ud, valuebytes: %ud,"
342 " totalbytes: %d) ...\n",
343 maskbytes, valuesbytes, totalbytes);
344 LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
345 LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
346
347 PMF_PARSE_CALL(rmw_cfg, cmd, h, offset, maskbytes, valuesbytes,
348 totalbytes, maskblob, valuesblob);
349 }
350
351
352 static int pmf_parser_read_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
353 {
354 u8 subaddr = (u8)pmf_next32(cmd);
355 u32 bytes = pmf_next32(cmd);
356
357 LOG_PARSE("pmf: read_i2c_sub(subaddr: %x, bytes: %ud)\n",
358 subaddr, bytes);
359
360 PMF_PARSE_CALL(read_i2c_sub, cmd, h, subaddr, bytes);
361 }
362
363 static int pmf_parser_write_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
364 {
365 u8 subaddr = (u8)pmf_next32(cmd);
366 u32 bytes = pmf_next32(cmd);
367 const void *blob = pmf_next_blob(cmd, bytes);
368
369 LOG_PARSE("pmf: write_i2c_sub(subaddr: %x, bytes: %ud) ...\n",
370 subaddr, bytes);
371 LOG_BLOB("pmf: data: \n", blob, bytes);
372
373 PMF_PARSE_CALL(write_i2c_sub, cmd, h, subaddr, bytes, blob);
374 }
375
376 static int pmf_parser_set_i2c_mode(struct pmf_cmd *cmd, struct pmf_handlers *h)
377 {
378 u32 mode = pmf_next32(cmd);
379
380 LOG_PARSE("pmf: set_i2c_mode(mode: %d)\n", mode);
381
382 PMF_PARSE_CALL(set_i2c_mode, cmd, h, mode);
383 }
384
385
386 static int pmf_parser_rmw_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
387 {
388 u8 subaddr = (u8)pmf_next32(cmd);
389 u32 maskbytes = pmf_next32(cmd);
390 u32 valuesbytes = pmf_next32(cmd);
391 u32 totalbytes = pmf_next32(cmd);
392 const void *maskblob = pmf_next_blob(cmd, maskbytes);
393 const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
394
395 LOG_PARSE("pmf: rmw_i2c_sub(subaddr: %x, maskbytes: %ud, valuebytes: %ud"
396 ", totalbytes: %d) ...\n",
397 subaddr, maskbytes, valuesbytes, totalbytes);
398 LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
399 LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
400
401 PMF_PARSE_CALL(rmw_i2c_sub, cmd, h, subaddr, maskbytes, valuesbytes,
402 totalbytes, maskblob, valuesblob);
403 }
404
405 static int pmf_parser_read_reg32_msrx(struct pmf_cmd *cmd,
406 struct pmf_handlers *h)
407 {
408 u32 offset = pmf_next32(cmd);
409 u32 mask = pmf_next32(cmd);
410 u32 shift = pmf_next32(cmd);
411 u32 xor = pmf_next32(cmd);
412
413 LOG_PARSE("pmf: read_reg32_msrx(offset: %x, mask: %x, shift: %x,"
414 " xor: %x\n", offset, mask, shift, xor);
415
416 PMF_PARSE_CALL(read_reg32_msrx, cmd, h, offset, mask, shift, xor);
417 }
418
419 static int pmf_parser_read_reg16_msrx(struct pmf_cmd *cmd,
420 struct pmf_handlers *h)
421 {
422 u32 offset = pmf_next32(cmd);
423 u32 mask = pmf_next32(cmd);
424 u32 shift = pmf_next32(cmd);
425 u32 xor = pmf_next32(cmd);
426
427 LOG_PARSE("pmf: read_reg16_msrx(offset: %x, mask: %x, shift: %x,"
428 " xor: %x\n", offset, mask, shift, xor);
429
430 PMF_PARSE_CALL(read_reg16_msrx, cmd, h, offset, mask, shift, xor);
431 }
432 static int pmf_parser_read_reg8_msrx(struct pmf_cmd *cmd,
433 struct pmf_handlers *h)
434 {
435 u32 offset = pmf_next32(cmd);
436 u32 mask = pmf_next32(cmd);
437 u32 shift = pmf_next32(cmd);
438 u32 xor = pmf_next32(cmd);
439
440 LOG_PARSE("pmf: read_reg8_msrx(offset: %x, mask: %x, shift: %x,"
441 " xor: %x\n", offset, mask, shift, xor);
442
443 PMF_PARSE_CALL(read_reg8_msrx, cmd, h, offset, mask, shift, xor);
444 }
445
446 static int pmf_parser_write_reg32_slm(struct pmf_cmd *cmd,
447 struct pmf_handlers *h)
448 {
449 u32 offset = pmf_next32(cmd);
450 u32 shift = pmf_next32(cmd);
451 u32 mask = pmf_next32(cmd);
452
453 LOG_PARSE("pmf: write_reg32_slm(offset: %x, shift: %x, mask: %x\n",
454 offset, shift, mask);
455
456 PMF_PARSE_CALL(write_reg32_slm, cmd, h, offset, shift, mask);
457 }
458
459 static int pmf_parser_write_reg16_slm(struct pmf_cmd *cmd,
460 struct pmf_handlers *h)
461 {
462 u32 offset = pmf_next32(cmd);
463 u32 shift = pmf_next32(cmd);
464 u32 mask = pmf_next32(cmd);
465
466 LOG_PARSE("pmf: write_reg16_slm(offset: %x, shift: %x, mask: %x\n",
467 offset, shift, mask);
468
469 PMF_PARSE_CALL(write_reg16_slm, cmd, h, offset, shift, mask);
470 }
471
472 static int pmf_parser_write_reg8_slm(struct pmf_cmd *cmd,
473 struct pmf_handlers *h)
474 {
475 u32 offset = pmf_next32(cmd);
476 u32 shift = pmf_next32(cmd);
477 u32 mask = pmf_next32(cmd);
478
479 LOG_PARSE("pmf: write_reg8_slm(offset: %x, shift: %x, mask: %x\n",
480 offset, shift, mask);
481
482 PMF_PARSE_CALL(write_reg8_slm, cmd, h, offset, shift, mask);
483 }
484
485 static int pmf_parser_mask_and_compare(struct pmf_cmd *cmd,
486 struct pmf_handlers *h)
487 {
488 u32 bytes = pmf_next32(cmd);
489 const void *maskblob = pmf_next_blob(cmd, bytes);
490 const void *valuesblob = pmf_next_blob(cmd, bytes);
491
492 LOG_PARSE("pmf: mask_and_compare(length: %ud ...\n", bytes);
493 LOG_BLOB("pmf: mask data: \n", maskblob, bytes);
494 LOG_BLOB("pmf: values data: \n", valuesblob, bytes);
495
496 PMF_PARSE_CALL(mask_and_compare, cmd, h,
497 bytes, maskblob, valuesblob);
498 }
499
500
501 typedef int (*pmf_cmd_parser_t)(struct pmf_cmd *cmd, struct pmf_handlers *h);
502
503 static pmf_cmd_parser_t pmf_parsers[PMF_CMD_COUNT] =
504 {
505 NULL,
506 pmf_parser_write_gpio,
507 pmf_parser_read_gpio,
508 pmf_parser_write_reg32,
509 pmf_parser_read_reg32,
510 pmf_parser_write_reg16,
511 pmf_parser_read_reg16,
512 pmf_parser_write_reg8,
513 pmf_parser_read_reg8,
514 pmf_parser_delay,
515 pmf_parser_wait_reg32,
516 pmf_parser_wait_reg16,
517 pmf_parser_wait_reg8,
518 pmf_parser_read_i2c,
519 pmf_parser_write_i2c,
520 pmf_parser_rmw_i2c,
521 NULL, /* Bogus command */
522 NULL, /* Shift bytes right: NYI */
523 NULL, /* Shift bytes left: NYI */
524 pmf_parser_read_cfg,
525 pmf_parser_write_cfg,
526 pmf_parser_rmw_cfg,
527 pmf_parser_read_i2c_sub,
528 pmf_parser_write_i2c_sub,
529 pmf_parser_set_i2c_mode,
530 pmf_parser_rmw_i2c_sub,
531 pmf_parser_read_reg32_msrx,
532 pmf_parser_read_reg16_msrx,
533 pmf_parser_read_reg8_msrx,
534 pmf_parser_write_reg32_slm,
535 pmf_parser_write_reg16_slm,
536 pmf_parser_write_reg8_slm,
537 pmf_parser_mask_and_compare,
538 };
539
540 struct pmf_device {
541 struct list_head link;
542 struct device_node *node;
543 struct pmf_handlers *handlers;
544 struct list_head functions;
545 struct kref ref;
546 };
547
548 static LIST_HEAD(pmf_devices);
549 static spinlock_t pmf_lock = SPIN_LOCK_UNLOCKED;
550 static DEFINE_MUTEX(pmf_irq_mutex);
551
552 static void pmf_release_device(struct kref *kref)
553 {
554 struct pmf_device *dev = container_of(kref, struct pmf_device, ref);
555 kfree(dev);
556 }
557
558 static inline void pmf_put_device(struct pmf_device *dev)
559 {
560 kref_put(&dev->ref, pmf_release_device);
561 }
562
563 static inline struct pmf_device *pmf_get_device(struct pmf_device *dev)
564 {
565 kref_get(&dev->ref);
566 return dev;
567 }
568
569 static inline struct pmf_device *pmf_find_device(struct device_node *np)
570 {
571 struct pmf_device *dev;
572
573 list_for_each_entry(dev, &pmf_devices, link) {
574 if (dev->node == np)
575 return pmf_get_device(dev);
576 }
577 return NULL;
578 }
579
580 static int pmf_parse_one(struct pmf_function *func,
581 struct pmf_handlers *handlers,
582 void *instdata, struct pmf_args *args)
583 {
584 struct pmf_cmd cmd;
585 u32 ccode;
586 int count, rc;
587
588 cmd.cmdptr = func->data;
589 cmd.cmdend = func->data + func->length;
590 cmd.func = func;
591 cmd.instdata = instdata;
592 cmd.args = args;
593 cmd.error = 0;
594
595 LOG_PARSE("pmf: func %s, %d bytes, %s...\n",
596 func->name, func->length,
597 handlers ? "executing" : "parsing");
598
599 /* One subcommand to parse for now */
600 count = 1;
601
602 while(count-- && cmd.cmdptr < cmd.cmdend) {
603 /* Get opcode */
604 ccode = pmf_next32(&cmd);
605 /* Check if we are hitting a command list, fetch new count */
606 if (ccode == 0) {
607 count = pmf_next32(&cmd) - 1;
608 ccode = pmf_next32(&cmd);
609 }
610 if (cmd.error) {
611 LOG_ERROR("pmf: parse error, not enough data\n");
612 return -ENXIO;
613 }
614 if (ccode >= PMF_CMD_COUNT) {
615 LOG_ERROR("pmf: command code %d unknown !\n", ccode);
616 return -ENXIO;
617 }
618 if (pmf_parsers[ccode] == NULL) {
619 LOG_ERROR("pmf: no parser for command %d !\n", ccode);
620 return -ENXIO;
621 }
622 rc = pmf_parsers[ccode](&cmd, handlers);
623 if (rc != 0) {
624 LOG_ERROR("pmf: parser for command %d returned"
625 " error %d\n", ccode, rc);
626 return rc;
627 }
628 }
629
630 /* We are doing an initial parse pass, we need to adjust the size */
631 if (handlers == NULL)
632 func->length = cmd.cmdptr - func->data;
633
634 return 0;
635 }
636
637 static int pmf_add_function_prop(struct pmf_device *dev, void *driverdata,
638 const char *name, u32 *data,
639 unsigned int length)
640 {
641 int count = 0;
642 struct pmf_function *func = NULL;
643
644 DBG("pmf: Adding functions for platform-do-%s\n", name);
645
646 while (length >= 12) {
647 /* Allocate a structure */
648 func = kzalloc(sizeof(struct pmf_function), GFP_KERNEL);
649 if (func == NULL)
650 goto bail;
651 kref_init(&func->ref);
652 INIT_LIST_HEAD(&func->irq_clients);
653 func->node = dev->node;
654 func->driver_data = driverdata;
655 func->name = name;
656 func->phandle = data[0];
657 func->flags = data[1];
658 data += 2;
659 length -= 8;
660 func->data = data;
661 func->length = length;
662 func->dev = dev;
663 DBG("pmf: idx %d: flags=%08x, phandle=%08x "
664 " %d bytes remaining, parsing...\n",
665 count+1, func->flags, func->phandle, length);
666 if (pmf_parse_one(func, NULL, NULL, NULL)) {
667 kfree(func);
668 goto bail;
669 }
670 length -= func->length;
671 data = (u32 *)(((u8 *)data) + func->length);
672 list_add(&func->link, &dev->functions);
673 pmf_get_device(dev);
674 count++;
675 }
676 bail:
677 DBG("pmf: Added %d functions\n", count);
678
679 return count;
680 }
681
682 static int pmf_add_functions(struct pmf_device *dev, void *driverdata)
683 {
684 struct property *pp;
685 #define PP_PREFIX "platform-do-"
686 const int plen = strlen(PP_PREFIX);
687 int count = 0;
688
689 for (pp = dev->node->properties; pp != 0; pp = pp->next) {
690 char *name;
691 if (strncmp(pp->name, PP_PREFIX, plen) != 0)
692 continue;
693 name = pp->name + plen;
694 if (strlen(name) && pp->length >= 12)
695 count += pmf_add_function_prop(dev, driverdata, name,
696 (u32 *)pp->value,
697 pp->length);
698 }
699 return count;
700 }
701
702
703 int pmf_register_driver(struct device_node *np,
704 struct pmf_handlers *handlers,
705 void *driverdata)
706 {
707 struct pmf_device *dev;
708 unsigned long flags;
709 int rc = 0;
710
711 if (handlers == NULL)
712 return -EINVAL;
713
714 DBG("pmf: registering driver for node %s\n", np->full_name);
715
716 spin_lock_irqsave(&pmf_lock, flags);
717 dev = pmf_find_device(np);
718 spin_unlock_irqrestore(&pmf_lock, flags);
719 if (dev != NULL) {
720 DBG("pmf: already there !\n");
721 pmf_put_device(dev);
722 return -EBUSY;
723 }
724
725 dev = kzalloc(sizeof(struct pmf_device), GFP_KERNEL);
726 if (dev == NULL) {
727 DBG("pmf: no memory !\n");
728 return -ENOMEM;
729 }
730 kref_init(&dev->ref);
731 dev->node = of_node_get(np);
732 dev->handlers = handlers;
733 INIT_LIST_HEAD(&dev->functions);
734
735 rc = pmf_add_functions(dev, driverdata);
736 if (rc == 0) {
737 DBG("pmf: no functions, disposing.. \n");
738 of_node_put(np);
739 kfree(dev);
740 return -ENODEV;
741 }
742
743 spin_lock_irqsave(&pmf_lock, flags);
744 list_add(&dev->link, &pmf_devices);
745 spin_unlock_irqrestore(&pmf_lock, flags);
746
747 return 0;
748 }
749 EXPORT_SYMBOL_GPL(pmf_register_driver);
750
751 struct pmf_function *pmf_get_function(struct pmf_function *func)
752 {
753 if (!try_module_get(func->dev->handlers->owner))
754 return NULL;
755 kref_get(&func->ref);
756 return func;
757 }
758 EXPORT_SYMBOL_GPL(pmf_get_function);
759
760 static void pmf_release_function(struct kref *kref)
761 {
762 struct pmf_function *func =
763 container_of(kref, struct pmf_function, ref);
764 pmf_put_device(func->dev);
765 kfree(func);
766 }
767
768 static inline void __pmf_put_function(struct pmf_function *func)
769 {
770 kref_put(&func->ref, pmf_release_function);
771 }
772
773 void pmf_put_function(struct pmf_function *func)
774 {
775 if (func == NULL)
776 return;
777 module_put(func->dev->handlers->owner);
778 __pmf_put_function(func);
779 }
780 EXPORT_SYMBOL_GPL(pmf_put_function);
781
782 void pmf_unregister_driver(struct device_node *np)
783 {
784 struct pmf_device *dev;
785 unsigned long flags;
786
787 DBG("pmf: unregistering driver for node %s\n", np->full_name);
788
789 spin_lock_irqsave(&pmf_lock, flags);
790 dev = pmf_find_device(np);
791 if (dev == NULL) {
792 DBG("pmf: not such driver !\n");
793 spin_unlock_irqrestore(&pmf_lock, flags);
794 return;
795 }
796 list_del(&dev->link);
797
798 while(!list_empty(&dev->functions)) {
799 struct pmf_function *func =
800 list_entry(dev->functions.next, typeof(*func), link);
801 list_del(&func->link);
802 __pmf_put_function(func);
803 }
804
805 pmf_put_device(dev);
806 spin_unlock_irqrestore(&pmf_lock, flags);
807 }
808 EXPORT_SYMBOL_GPL(pmf_unregister_driver);
809
810 struct pmf_function *__pmf_find_function(struct device_node *target,
811 const char *name, u32 flags)
812 {
813 struct device_node *actor = of_node_get(target);
814 struct pmf_device *dev;
815 struct pmf_function *func, *result = NULL;
816 char fname[64];
817 u32 *prop, ph;
818
819 /*
820 * Look for a "platform-*" function reference. If we can't find
821 * one, then we fallback to a direct call attempt
822 */
823 snprintf(fname, 63, "platform-%s", name);
824 prop = (u32 *)get_property(target, fname, NULL);
825 if (prop == NULL)
826 goto find_it;
827 ph = *prop;
828 if (ph == 0)
829 goto find_it;
830
831 /*
832 * Ok, now try to find the actor. If we can't find it, we fail,
833 * there is no point in falling back there
834 */
835 of_node_put(actor);
836 actor = of_find_node_by_phandle(ph);
837 if (actor == NULL)
838 return NULL;
839 find_it:
840 dev = pmf_find_device(actor);
841 if (dev == NULL)
842 return NULL;
843
844 list_for_each_entry(func, &dev->functions, link) {
845 if (name && strcmp(name, func->name))
846 continue;
847 if (func->phandle && target->node != func->phandle)
848 continue;
849 if ((func->flags & flags) == 0)
850 continue;
851 result = func;
852 break;
853 }
854 of_node_put(actor);
855 pmf_put_device(dev);
856 return result;
857 }
858
859
860 int pmf_register_irq_client(struct device_node *target,
861 const char *name,
862 struct pmf_irq_client *client)
863 {
864 struct pmf_function *func;
865 unsigned long flags;
866
867 spin_lock_irqsave(&pmf_lock, flags);
868 func = __pmf_find_function(target, name, PMF_FLAGS_INT_GEN);
869 if (func)
870 func = pmf_get_function(func);
871 spin_unlock_irqrestore(&pmf_lock, flags);
872 if (func == NULL)
873 return -ENODEV;
874 mutex_lock(&pmf_irq_mutex);
875 if (list_empty(&func->irq_clients))
876 func->dev->handlers->irq_enable(func);
877 list_add(&client->link, &func->irq_clients);
878 client->func = func;
879 mutex_unlock(&pmf_irq_mutex);
880
881 return 0;
882 }
883 EXPORT_SYMBOL_GPL(pmf_register_irq_client);
884
885 void pmf_unregister_irq_client(struct pmf_irq_client *client)
886 {
887 struct pmf_function *func = client->func;
888
889 BUG_ON(func == NULL);
890
891 mutex_lock(&pmf_irq_mutex);
892 client->func = NULL;
893 list_del(&client->link);
894 if (list_empty(&func->irq_clients))
895 func->dev->handlers->irq_disable(func);
896 mutex_unlock(&pmf_irq_mutex);
897 pmf_put_function(func);
898 }
899 EXPORT_SYMBOL_GPL(pmf_unregister_irq_client);
900
901
902 void pmf_do_irq(struct pmf_function *func)
903 {
904 unsigned long flags;
905 struct pmf_irq_client *client;
906
907 /* For now, using a spinlock over the whole function. Can be made
908 * to drop the lock using 2 lists if necessary
909 */
910 spin_lock_irqsave(&pmf_lock, flags);
911 list_for_each_entry(client, &func->irq_clients, link) {
912 if (!try_module_get(client->owner))
913 continue;
914 client->handler(client->data);
915 module_put(client->owner);
916 }
917 spin_unlock_irqrestore(&pmf_lock, flags);
918 }
919 EXPORT_SYMBOL_GPL(pmf_do_irq);
920
921
922 int pmf_call_one(struct pmf_function *func, struct pmf_args *args)
923 {
924 struct pmf_device *dev = func->dev;
925 void *instdata = NULL;
926 int rc = 0;
927
928 DBG(" ** pmf_call_one(%s/%s) **\n", dev->node->full_name, func->name);
929
930 if (dev->handlers->begin)
931 instdata = dev->handlers->begin(func, args);
932 rc = pmf_parse_one(func, dev->handlers, instdata, args);
933 if (dev->handlers->end)
934 dev->handlers->end(func, instdata);
935
936 return rc;
937 }
938 EXPORT_SYMBOL_GPL(pmf_call_one);
939
940 int pmf_do_functions(struct device_node *np, const char *name,
941 u32 phandle, u32 fflags, struct pmf_args *args)
942 {
943 struct pmf_device *dev;
944 struct pmf_function *func, *tmp;
945 unsigned long flags;
946 int rc = -ENODEV;
947
948 spin_lock_irqsave(&pmf_lock, flags);
949
950 dev = pmf_find_device(np);
951 if (dev == NULL) {
952 spin_unlock_irqrestore(&pmf_lock, flags);
953 return -ENODEV;
954 }
955 list_for_each_entry_safe(func, tmp, &dev->functions, link) {
956 if (name && strcmp(name, func->name))
957 continue;
958 if (phandle && func->phandle && phandle != func->phandle)
959 continue;
960 if ((func->flags & fflags) == 0)
961 continue;
962 if (pmf_get_function(func) == NULL)
963 continue;
964 spin_unlock_irqrestore(&pmf_lock, flags);
965 rc = pmf_call_one(func, args);
966 pmf_put_function(func);
967 spin_lock_irqsave(&pmf_lock, flags);
968 }
969 pmf_put_device(dev);
970 spin_unlock_irqrestore(&pmf_lock, flags);
971
972 return rc;
973 }
974 EXPORT_SYMBOL_GPL(pmf_do_functions);
975
976
977 struct pmf_function *pmf_find_function(struct device_node *target,
978 const char *name)
979 {
980 struct pmf_function *func;
981 unsigned long flags;
982
983 spin_lock_irqsave(&pmf_lock, flags);
984 func = __pmf_find_function(target, name, PMF_FLAGS_ON_DEMAND);
985 if (func)
986 func = pmf_get_function(func);
987 spin_unlock_irqrestore(&pmf_lock, flags);
988 return func;
989 }
990 EXPORT_SYMBOL_GPL(pmf_find_function);
991
992 int pmf_call_function(struct device_node *target, const char *name,
993 struct pmf_args *args)
994 {
995 struct pmf_function *func = pmf_find_function(target, name);
996 int rc;
997
998 if (func == NULL)
999 return -ENODEV;
1000
1001 rc = pmf_call_one(func, args);
1002 pmf_put_function(func);
1003 return rc;
1004 }
1005 EXPORT_SYMBOL_GPL(pmf_call_function);
1006
Linux kernel - Deliverables
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