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Commit | Line | Data |
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96495d90 SG |
1 | /* |
2 | * Copyright (c) 2013 Google, Inc | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <dm.h> | |
9 | #include <errno.h> | |
0dac4d51 | 10 | #include <fdtdec.h> |
b892d127 | 11 | #include <malloc.h> |
96495d90 | 12 | #include <asm/gpio.h> |
84b8bf6d | 13 | #include <linux/bug.h> |
fe1ef503 | 14 | #include <linux/ctype.h> |
96495d90 | 15 | |
3669e0e7 SG |
16 | DECLARE_GLOBAL_DATA_PTR; |
17 | ||
96495d90 SG |
18 | /** |
19 | * gpio_to_device() - Convert global GPIO number to device, number | |
96495d90 SG |
20 | * |
21 | * Convert the GPIO number to an entry in the list of GPIOs | |
22 | * or GPIO blocks registered with the GPIO controller. Returns | |
23 | * entry on success, NULL on error. | |
ae7123f8 SG |
24 | * |
25 | * @gpio: The numeric representation of the GPIO | |
26 | * @desc: Returns description (desc->flags will always be 0) | |
27 | * @return 0 if found, -ENOENT if not found | |
96495d90 | 28 | */ |
ae7123f8 | 29 | static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc) |
96495d90 SG |
30 | { |
31 | struct gpio_dev_priv *uc_priv; | |
54c5d08a | 32 | struct udevice *dev; |
96495d90 SG |
33 | int ret; |
34 | ||
35 | for (ret = uclass_first_device(UCLASS_GPIO, &dev); | |
36 | dev; | |
37 | ret = uclass_next_device(&dev)) { | |
e564f054 | 38 | uc_priv = dev_get_uclass_priv(dev); |
96495d90 SG |
39 | if (gpio >= uc_priv->gpio_base && |
40 | gpio < uc_priv->gpio_base + uc_priv->gpio_count) { | |
ae7123f8 SG |
41 | desc->dev = dev; |
42 | desc->offset = gpio - uc_priv->gpio_base; | |
43 | desc->flags = 0; | |
96495d90 SG |
44 | return 0; |
45 | } | |
46 | } | |
47 | ||
48 | /* No such GPIO */ | |
ae7123f8 | 49 | return ret ? ret : -ENOENT; |
96495d90 SG |
50 | } |
51 | ||
32ec1598 | 52 | int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc) |
96495d90 | 53 | { |
fe1ef503 | 54 | struct gpio_dev_priv *uc_priv = NULL; |
54c5d08a | 55 | struct udevice *dev; |
fe1ef503 SG |
56 | ulong offset; |
57 | int numeric; | |
96495d90 SG |
58 | int ret; |
59 | ||
fe1ef503 | 60 | numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1; |
96495d90 SG |
61 | for (ret = uclass_first_device(UCLASS_GPIO, &dev); |
62 | dev; | |
63 | ret = uclass_next_device(&dev)) { | |
96495d90 SG |
64 | int len; |
65 | ||
e564f054 | 66 | uc_priv = dev_get_uclass_priv(dev); |
fe1ef503 SG |
67 | if (numeric != -1) { |
68 | offset = numeric - uc_priv->gpio_base; | |
69 | /* Allow GPIOs to be numbered from 0 */ | |
70 | if (offset >= 0 && offset < uc_priv->gpio_count) | |
71 | break; | |
72 | } | |
73 | ||
96495d90 SG |
74 | len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0; |
75 | ||
939cda5b | 76 | if (!strncasecmp(name, uc_priv->bank_name, len)) { |
fe1ef503 SG |
77 | if (!strict_strtoul(name + len, 10, &offset)) |
78 | break; | |
96495d90 SG |
79 | } |
80 | } | |
81 | ||
fe1ef503 SG |
82 | if (!dev) |
83 | return ret ? ret : -EINVAL; | |
84 | ||
32ec1598 SG |
85 | desc->dev = dev; |
86 | desc->offset = offset; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | int gpio_lookup_name(const char *name, struct udevice **devp, | |
92 | unsigned int *offsetp, unsigned int *gpiop) | |
93 | { | |
94 | struct gpio_desc desc; | |
95 | int ret; | |
96 | ||
fe1ef503 | 97 | if (devp) |
32ec1598 SG |
98 | *devp = NULL; |
99 | ret = dm_gpio_lookup_name(name, &desc); | |
100 | if (ret) | |
101 | return ret; | |
102 | ||
103 | if (devp) | |
104 | *devp = desc.dev; | |
fe1ef503 | 105 | if (offsetp) |
32ec1598 SG |
106 | *offsetp = desc.offset; |
107 | if (gpiop) { | |
108 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc.dev); | |
109 | ||
110 | *gpiop = uc_priv->gpio_base + desc.offset; | |
111 | } | |
fe1ef503 SG |
112 | |
113 | return 0; | |
96495d90 SG |
114 | } |
115 | ||
3669e0e7 SG |
116 | static int gpio_find_and_xlate(struct gpio_desc *desc, |
117 | struct fdtdec_phandle_args *args) | |
0dac4d51 SG |
118 | { |
119 | struct dm_gpio_ops *ops = gpio_get_ops(desc->dev); | |
120 | ||
121 | /* Use the first argument as the offset by default */ | |
122 | if (args->args_count > 0) | |
123 | desc->offset = args->args[0]; | |
124 | else | |
125 | desc->offset = -1; | |
126 | desc->flags = 0; | |
127 | ||
128 | return ops->xlate ? ops->xlate(desc->dev, desc, args) : 0; | |
129 | } | |
130 | ||
efa677fb | 131 | int dm_gpio_request(struct gpio_desc *desc, const char *label) |
ae7123f8 SG |
132 | { |
133 | struct udevice *dev = desc->dev; | |
134 | struct gpio_dev_priv *uc_priv; | |
135 | char *str; | |
136 | int ret; | |
137 | ||
e564f054 | 138 | uc_priv = dev_get_uclass_priv(dev); |
ae7123f8 SG |
139 | if (uc_priv->name[desc->offset]) |
140 | return -EBUSY; | |
141 | str = strdup(label); | |
142 | if (!str) | |
143 | return -ENOMEM; | |
144 | if (gpio_get_ops(dev)->request) { | |
145 | ret = gpio_get_ops(dev)->request(dev, desc->offset, label); | |
146 | if (ret) { | |
147 | free(str); | |
148 | return ret; | |
149 | } | |
150 | } | |
151 | uc_priv->name[desc->offset] = str; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
3669e0e7 SG |
156 | static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...) |
157 | { | |
4dc5259a | 158 | #if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF) |
3669e0e7 SG |
159 | va_list args; |
160 | char buf[40]; | |
161 | ||
162 | va_start(args, fmt); | |
163 | vscnprintf(buf, sizeof(buf), fmt, args); | |
164 | va_end(args); | |
165 | return dm_gpio_request(desc, buf); | |
4dc5259a SG |
166 | #else |
167 | return dm_gpio_request(desc, fmt); | |
168 | #endif | |
3669e0e7 SG |
169 | } |
170 | ||
96495d90 SG |
171 | /** |
172 | * gpio_request() - [COMPAT] Request GPIO | |
173 | * gpio: GPIO number | |
174 | * label: Name for the requested GPIO | |
175 | * | |
b892d127 SG |
176 | * The label is copied and allocated so the caller does not need to keep |
177 | * the pointer around. | |
178 | * | |
96495d90 SG |
179 | * This function implements the API that's compatible with current |
180 | * GPIO API used in U-Boot. The request is forwarded to particular | |
181 | * GPIO driver. Returns 0 on success, negative value on error. | |
182 | */ | |
183 | int gpio_request(unsigned gpio, const char *label) | |
184 | { | |
ae7123f8 | 185 | struct gpio_desc desc; |
96495d90 SG |
186 | int ret; |
187 | ||
ae7123f8 | 188 | ret = gpio_to_device(gpio, &desc); |
96495d90 SG |
189 | if (ret) |
190 | return ret; | |
191 | ||
ae7123f8 | 192 | return dm_gpio_request(&desc, label); |
96495d90 SG |
193 | } |
194 | ||
d44f597b SG |
195 | /** |
196 | * gpio_requestf() - [COMPAT] Request GPIO | |
197 | * @gpio: GPIO number | |
198 | * @fmt: Format string for the requested GPIO | |
199 | * @...: Arguments for the printf() format string | |
200 | * | |
201 | * This function implements the API that's compatible with current | |
202 | * GPIO API used in U-Boot. The request is forwarded to particular | |
203 | * GPIO driver. Returns 0 on success, negative value on error. | |
204 | */ | |
205 | int gpio_requestf(unsigned gpio, const char *fmt, ...) | |
206 | { | |
4dc5259a | 207 | #if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF) |
d44f597b SG |
208 | va_list args; |
209 | char buf[40]; | |
210 | ||
211 | va_start(args, fmt); | |
212 | vscnprintf(buf, sizeof(buf), fmt, args); | |
213 | va_end(args); | |
214 | return gpio_request(gpio, buf); | |
4dc5259a SG |
215 | #else |
216 | return gpio_request(gpio, fmt); | |
217 | #endif | |
d44f597b SG |
218 | } |
219 | ||
ae7123f8 | 220 | int _dm_gpio_free(struct udevice *dev, uint offset) |
96495d90 | 221 | { |
b892d127 | 222 | struct gpio_dev_priv *uc_priv; |
96495d90 SG |
223 | int ret; |
224 | ||
e564f054 | 225 | uc_priv = dev_get_uclass_priv(dev); |
b892d127 SG |
226 | if (!uc_priv->name[offset]) |
227 | return -ENXIO; | |
228 | if (gpio_get_ops(dev)->free) { | |
229 | ret = gpio_get_ops(dev)->free(dev, offset); | |
230 | if (ret) | |
231 | return ret; | |
232 | } | |
233 | ||
234 | free(uc_priv->name[offset]); | |
235 | uc_priv->name[offset] = NULL; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
ae7123f8 SG |
240 | /** |
241 | * gpio_free() - [COMPAT] Relinquish GPIO | |
242 | * gpio: GPIO number | |
243 | * | |
244 | * This function implements the API that's compatible with current | |
245 | * GPIO API used in U-Boot. The request is forwarded to particular | |
246 | * GPIO driver. Returns 0 on success, negative value on error. | |
247 | */ | |
248 | int gpio_free(unsigned gpio) | |
b892d127 | 249 | { |
ae7123f8 SG |
250 | struct gpio_desc desc; |
251 | int ret; | |
252 | ||
253 | ret = gpio_to_device(gpio, &desc); | |
254 | if (ret) | |
255 | return ret; | |
256 | ||
257 | return _dm_gpio_free(desc.dev, desc.offset); | |
258 | } | |
b892d127 | 259 | |
17c43f1a | 260 | static int check_reserved(const struct gpio_desc *desc, const char *func) |
ae7123f8 | 261 | { |
eca48665 SG |
262 | struct gpio_dev_priv *uc_priv; |
263 | ||
264 | if (!dm_gpio_is_valid(desc)) | |
265 | return -ENOENT; | |
ae7123f8 | 266 | |
eca48665 | 267 | uc_priv = dev_get_uclass_priv(desc->dev); |
ae7123f8 | 268 | if (!uc_priv->name[desc->offset]) { |
b892d127 | 269 | printf("%s: %s: error: gpio %s%d not reserved\n", |
ae7123f8 SG |
270 | desc->dev->name, func, |
271 | uc_priv->bank_name ? uc_priv->bank_name : "", | |
272 | desc->offset); | |
b892d127 SG |
273 | return -EBUSY; |
274 | } | |
275 | ||
276 | return 0; | |
96495d90 SG |
277 | } |
278 | ||
279 | /** | |
280 | * gpio_direction_input() - [COMPAT] Set GPIO direction to input | |
281 | * gpio: GPIO number | |
282 | * | |
283 | * This function implements the API that's compatible with current | |
284 | * GPIO API used in U-Boot. The request is forwarded to particular | |
285 | * GPIO driver. Returns 0 on success, negative value on error. | |
286 | */ | |
287 | int gpio_direction_input(unsigned gpio) | |
288 | { | |
ae7123f8 | 289 | struct gpio_desc desc; |
96495d90 SG |
290 | int ret; |
291 | ||
ae7123f8 SG |
292 | ret = gpio_to_device(gpio, &desc); |
293 | if (ret) | |
294 | return ret; | |
295 | ret = check_reserved(&desc, "dir_input"); | |
96495d90 SG |
296 | if (ret) |
297 | return ret; | |
298 | ||
ae7123f8 | 299 | return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset); |
96495d90 SG |
300 | } |
301 | ||
302 | /** | |
303 | * gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value | |
304 | * gpio: GPIO number | |
305 | * value: Logical value to be set on the GPIO pin | |
306 | * | |
307 | * This function implements the API that's compatible with current | |
308 | * GPIO API used in U-Boot. The request is forwarded to particular | |
309 | * GPIO driver. Returns 0 on success, negative value on error. | |
310 | */ | |
311 | int gpio_direction_output(unsigned gpio, int value) | |
312 | { | |
ae7123f8 | 313 | struct gpio_desc desc; |
96495d90 SG |
314 | int ret; |
315 | ||
ae7123f8 SG |
316 | ret = gpio_to_device(gpio, &desc); |
317 | if (ret) | |
318 | return ret; | |
319 | ret = check_reserved(&desc, "dir_output"); | |
320 | if (ret) | |
321 | return ret; | |
322 | ||
323 | return gpio_get_ops(desc.dev)->direction_output(desc.dev, | |
324 | desc.offset, value); | |
325 | } | |
326 | ||
17c43f1a | 327 | int dm_gpio_get_value(const struct gpio_desc *desc) |
ae7123f8 SG |
328 | { |
329 | int value; | |
330 | int ret; | |
331 | ||
332 | ret = check_reserved(desc, "get_value"); | |
96495d90 SG |
333 | if (ret) |
334 | return ret; | |
335 | ||
ae7123f8 SG |
336 | value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset); |
337 | ||
338 | return desc->flags & GPIOD_ACTIVE_LOW ? !value : value; | |
339 | } | |
340 | ||
17c43f1a | 341 | int dm_gpio_set_value(const struct gpio_desc *desc, int value) |
ae7123f8 SG |
342 | { |
343 | int ret; | |
344 | ||
345 | ret = check_reserved(desc, "set_value"); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | if (desc->flags & GPIOD_ACTIVE_LOW) | |
350 | value = !value; | |
351 | gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags) | |
356 | { | |
357 | struct udevice *dev = desc->dev; | |
358 | struct dm_gpio_ops *ops = gpio_get_ops(dev); | |
359 | int ret; | |
360 | ||
361 | ret = check_reserved(desc, "set_dir"); | |
362 | if (ret) | |
363 | return ret; | |
364 | ||
365 | if (flags & GPIOD_IS_OUT) { | |
366 | int value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0; | |
367 | ||
368 | if (flags & GPIOD_ACTIVE_LOW) | |
369 | value = !value; | |
370 | ret = ops->direction_output(dev, desc->offset, value); | |
371 | } else if (flags & GPIOD_IS_IN) { | |
372 | ret = ops->direction_input(dev, desc->offset); | |
373 | } | |
374 | if (ret) | |
375 | return ret; | |
376 | /* | |
377 | * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in | |
378 | * futures | |
379 | */ | |
380 | desc->flags = flags; | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | int dm_gpio_set_dir(struct gpio_desc *desc) | |
386 | { | |
387 | return dm_gpio_set_dir_flags(desc, desc->flags); | |
96495d90 SG |
388 | } |
389 | ||
390 | /** | |
391 | * gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value | |
392 | * gpio: GPIO number | |
393 | * | |
394 | * This function implements the API that's compatible with current | |
395 | * GPIO API used in U-Boot. The request is forwarded to particular | |
396 | * GPIO driver. Returns the value of the GPIO pin, or negative value | |
397 | * on error. | |
398 | */ | |
399 | int gpio_get_value(unsigned gpio) | |
400 | { | |
96495d90 SG |
401 | int ret; |
402 | ||
ae7123f8 SG |
403 | struct gpio_desc desc; |
404 | ||
405 | ret = gpio_to_device(gpio, &desc); | |
96495d90 SG |
406 | if (ret) |
407 | return ret; | |
ae7123f8 | 408 | return dm_gpio_get_value(&desc); |
96495d90 SG |
409 | } |
410 | ||
411 | /** | |
412 | * gpio_set_value() - [COMPAT] Configure logical value on GPIO pin | |
413 | * gpio: GPIO number | |
414 | * value: Logical value to be set on the GPIO pin. | |
415 | * | |
416 | * This function implements the API that's compatible with current | |
417 | * GPIO API used in U-Boot. The request is forwarded to particular | |
418 | * GPIO driver. Returns 0 on success, negative value on error. | |
419 | */ | |
420 | int gpio_set_value(unsigned gpio, int value) | |
421 | { | |
ae7123f8 | 422 | struct gpio_desc desc; |
96495d90 SG |
423 | int ret; |
424 | ||
ae7123f8 | 425 | ret = gpio_to_device(gpio, &desc); |
96495d90 SG |
426 | if (ret) |
427 | return ret; | |
ae7123f8 | 428 | return dm_gpio_set_value(&desc, value); |
96495d90 SG |
429 | } |
430 | ||
54c5d08a | 431 | const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) |
96495d90 SG |
432 | { |
433 | struct gpio_dev_priv *priv; | |
434 | ||
435 | /* Must be called on an active device */ | |
e564f054 | 436 | priv = dev_get_uclass_priv(dev); |
96495d90 SG |
437 | assert(priv); |
438 | ||
439 | *bit_count = priv->gpio_count; | |
440 | return priv->bank_name; | |
441 | } | |
442 | ||
6449a506 SG |
443 | static const char * const gpio_function[GPIOF_COUNT] = { |
444 | "input", | |
445 | "output", | |
446 | "unused", | |
447 | "unknown", | |
448 | "func", | |
449 | }; | |
450 | ||
451 | int get_function(struct udevice *dev, int offset, bool skip_unused, | |
452 | const char **namep) | |
453 | { | |
e564f054 | 454 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
6449a506 SG |
455 | struct dm_gpio_ops *ops = gpio_get_ops(dev); |
456 | ||
457 | BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); | |
458 | if (!device_active(dev)) | |
459 | return -ENODEV; | |
460 | if (offset < 0 || offset >= uc_priv->gpio_count) | |
461 | return -EINVAL; | |
462 | if (namep) | |
463 | *namep = uc_priv->name[offset]; | |
464 | if (skip_unused && !uc_priv->name[offset]) | |
465 | return GPIOF_UNUSED; | |
466 | if (ops->get_function) { | |
467 | int ret; | |
468 | ||
469 | ret = ops->get_function(dev, offset); | |
470 | if (ret < 0) | |
471 | return ret; | |
472 | if (ret >= ARRAY_SIZE(gpio_function)) | |
473 | return -ENODATA; | |
474 | return ret; | |
475 | } | |
476 | ||
477 | return GPIOF_UNKNOWN; | |
478 | } | |
479 | ||
480 | int gpio_get_function(struct udevice *dev, int offset, const char **namep) | |
481 | { | |
482 | return get_function(dev, offset, true, namep); | |
483 | } | |
484 | ||
485 | int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep) | |
486 | { | |
487 | return get_function(dev, offset, false, namep); | |
488 | } | |
489 | ||
0757535a SG |
490 | int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize) |
491 | { | |
492 | struct dm_gpio_ops *ops = gpio_get_ops(dev); | |
493 | struct gpio_dev_priv *priv; | |
494 | char *str = buf; | |
495 | int func; | |
496 | int ret; | |
497 | int len; | |
498 | ||
499 | BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); | |
500 | ||
501 | *buf = 0; | |
e564f054 | 502 | priv = dev_get_uclass_priv(dev); |
0757535a SG |
503 | ret = gpio_get_raw_function(dev, offset, NULL); |
504 | if (ret < 0) | |
505 | return ret; | |
506 | func = ret; | |
507 | len = snprintf(str, buffsize, "%s%d: %s", | |
508 | priv->bank_name ? priv->bank_name : "", | |
509 | offset, gpio_function[func]); | |
510 | if (func == GPIOF_INPUT || func == GPIOF_OUTPUT || | |
511 | func == GPIOF_UNUSED) { | |
512 | const char *label; | |
513 | bool used; | |
514 | ||
515 | ret = ops->get_value(dev, offset); | |
516 | if (ret < 0) | |
517 | return ret; | |
518 | used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED; | |
519 | snprintf(str + len, buffsize - len, ": %d [%c]%s%s", | |
520 | ret, | |
521 | used ? 'x' : ' ', | |
522 | used ? " " : "", | |
523 | label ? label : ""); | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
962f5caf SG |
529 | int gpio_claim_vector(const int *gpio_num_array, const char *fmt) |
530 | { | |
531 | int i, ret; | |
532 | int gpio; | |
533 | ||
534 | for (i = 0; i < 32; i++) { | |
535 | gpio = gpio_num_array[i]; | |
536 | if (gpio == -1) | |
537 | break; | |
538 | ret = gpio_requestf(gpio, fmt, i); | |
539 | if (ret) | |
540 | goto err; | |
541 | ret = gpio_direction_input(gpio); | |
542 | if (ret) { | |
543 | gpio_free(gpio); | |
544 | goto err; | |
545 | } | |
546 | } | |
547 | ||
548 | return 0; | |
549 | err: | |
550 | for (i--; i >= 0; i--) | |
551 | gpio_free(gpio_num_array[i]); | |
552 | ||
553 | return ret; | |
554 | } | |
555 | ||
e5901c94 SG |
556 | /* |
557 | * get a number comprised of multiple GPIO values. gpio_num_array points to | |
558 | * the array of gpio pin numbers to scan, terminated by -1. | |
559 | */ | |
962f5caf | 560 | int gpio_get_values_as_int(const int *gpio_list) |
e5901c94 SG |
561 | { |
562 | int gpio; | |
563 | unsigned bitmask = 1; | |
564 | unsigned vector = 0; | |
962f5caf | 565 | int ret; |
e5901c94 SG |
566 | |
567 | while (bitmask && | |
962f5caf SG |
568 | ((gpio = *gpio_list++) != -1)) { |
569 | ret = gpio_get_value(gpio); | |
570 | if (ret < 0) | |
571 | return ret; | |
572 | else if (ret) | |
e5901c94 SG |
573 | vector |= bitmask; |
574 | bitmask <<= 1; | |
575 | } | |
962f5caf | 576 | |
e5901c94 SG |
577 | return vector; |
578 | } | |
579 | ||
17c43f1a | 580 | int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count) |
bbf24780 SG |
581 | { |
582 | unsigned bitmask = 1; | |
583 | unsigned vector = 0; | |
584 | int ret, i; | |
585 | ||
586 | for (i = 0; i < count; i++) { | |
587 | ret = dm_gpio_get_value(&desc_list[i]); | |
588 | if (ret < 0) | |
589 | return ret; | |
590 | else if (ret) | |
591 | vector |= bitmask; | |
592 | bitmask <<= 1; | |
593 | } | |
594 | ||
595 | return vector; | |
596 | } | |
597 | ||
3669e0e7 SG |
598 | static int _gpio_request_by_name_nodev(const void *blob, int node, |
599 | const char *list_name, int index, | |
600 | struct gpio_desc *desc, int flags, | |
601 | bool add_index) | |
602 | { | |
603 | struct fdtdec_phandle_args args; | |
604 | int ret; | |
605 | ||
606 | desc->dev = NULL; | |
607 | desc->offset = 0; | |
608 | ret = fdtdec_parse_phandle_with_args(blob, node, list_name, | |
609 | "#gpio-cells", 0, index, &args); | |
610 | if (ret) { | |
611 | debug("%s: fdtdec_parse_phandle_with_args failed\n", __func__); | |
612 | goto err; | |
613 | } | |
614 | ||
615 | ret = uclass_get_device_by_of_offset(UCLASS_GPIO, args.node, | |
616 | &desc->dev); | |
617 | if (ret) { | |
618 | debug("%s: uclass_get_device_by_of_offset failed\n", __func__); | |
619 | goto err; | |
620 | } | |
621 | ret = gpio_find_and_xlate(desc, &args); | |
622 | if (ret) { | |
623 | debug("%s: gpio_find_and_xlate failed\n", __func__); | |
624 | goto err; | |
625 | } | |
626 | ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s", | |
627 | fdt_get_name(blob, node, NULL), | |
628 | list_name, index); | |
629 | if (ret) { | |
630 | debug("%s: dm_gpio_requestf failed\n", __func__); | |
631 | goto err; | |
632 | } | |
633 | ret = dm_gpio_set_dir_flags(desc, flags | desc->flags); | |
634 | if (ret) { | |
635 | debug("%s: dm_gpio_set_dir failed\n", __func__); | |
636 | goto err; | |
637 | } | |
638 | ||
639 | return 0; | |
640 | err: | |
641 | debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n", | |
642 | __func__, fdt_get_name(blob, node, NULL), list_name, index, ret); | |
643 | return ret; | |
644 | } | |
645 | ||
646 | int gpio_request_by_name_nodev(const void *blob, int node, | |
647 | const char *list_name, int index, | |
648 | struct gpio_desc *desc, int flags) | |
649 | { | |
650 | return _gpio_request_by_name_nodev(blob, node, list_name, index, desc, | |
651 | flags, index > 0); | |
652 | } | |
653 | ||
654 | int gpio_request_by_name(struct udevice *dev, const char *list_name, int index, | |
655 | struct gpio_desc *desc, int flags) | |
656 | { | |
657 | /* | |
658 | * This isn't ideal since we don't use dev->name in the debug() | |
659 | * calls in gpio_request_by_name(), but we can do this until | |
660 | * gpio_request_by_name_nodev() can be dropped. | |
661 | */ | |
662 | return gpio_request_by_name_nodev(gd->fdt_blob, dev->of_offset, | |
663 | list_name, index, desc, flags); | |
664 | } | |
665 | ||
666 | int gpio_request_list_by_name_nodev(const void *blob, int node, | |
667 | const char *list_name, | |
668 | struct gpio_desc *desc, int max_count, | |
669 | int flags) | |
670 | { | |
671 | int count; | |
672 | int ret; | |
673 | ||
2984e7a1 | 674 | for (count = 0; count < max_count; count++) { |
3669e0e7 SG |
675 | ret = _gpio_request_by_name_nodev(blob, node, list_name, count, |
676 | &desc[count], flags, true); | |
677 | if (ret == -ENOENT) | |
678 | break; | |
679 | else if (ret) | |
680 | goto err; | |
681 | } | |
682 | ||
683 | /* We ran out of GPIOs in the list */ | |
684 | return count; | |
685 | ||
686 | err: | |
687 | gpio_free_list_nodev(desc, count - 1); | |
688 | ||
689 | return ret; | |
690 | } | |
691 | ||
692 | int gpio_request_list_by_name(struct udevice *dev, const char *list_name, | |
693 | struct gpio_desc *desc, int max_count, | |
694 | int flags) | |
695 | { | |
696 | /* | |
697 | * This isn't ideal since we don't use dev->name in the debug() | |
698 | * calls in gpio_request_by_name(), but we can do this until | |
699 | * gpio_request_list_by_name_nodev() can be dropped. | |
700 | */ | |
701 | return gpio_request_list_by_name_nodev(gd->fdt_blob, dev->of_offset, | |
702 | list_name, desc, max_count, | |
703 | flags); | |
704 | } | |
705 | ||
706 | int gpio_get_list_count(struct udevice *dev, const char *list_name) | |
707 | { | |
708 | int ret; | |
709 | ||
710 | ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, | |
711 | list_name, "#gpio-cells", 0, -1, | |
712 | NULL); | |
713 | if (ret) { | |
714 | debug("%s: Node '%s', property '%s', GPIO count failed: %d\n", | |
715 | __func__, dev->name, list_name, ret); | |
716 | } | |
717 | ||
718 | return ret; | |
719 | } | |
720 | ||
721 | int dm_gpio_free(struct udevice *dev, struct gpio_desc *desc) | |
722 | { | |
723 | /* For now, we don't do any checking of dev */ | |
724 | return _dm_gpio_free(desc->dev, desc->offset); | |
725 | } | |
726 | ||
727 | int gpio_free_list(struct udevice *dev, struct gpio_desc *desc, int count) | |
728 | { | |
729 | int i; | |
730 | ||
731 | /* For now, we don't do any checking of dev */ | |
732 | for (i = 0; i < count; i++) | |
733 | dm_gpio_free(dev, &desc[i]); | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | int gpio_free_list_nodev(struct gpio_desc *desc, int count) | |
739 | { | |
740 | return gpio_free_list(NULL, desc, count); | |
741 | } | |
742 | ||
96495d90 | 743 | /* We need to renumber the GPIOs when any driver is probed/removed */ |
b892d127 | 744 | static int gpio_renumber(struct udevice *removed_dev) |
96495d90 SG |
745 | { |
746 | struct gpio_dev_priv *uc_priv; | |
54c5d08a | 747 | struct udevice *dev; |
96495d90 SG |
748 | struct uclass *uc; |
749 | unsigned base; | |
750 | int ret; | |
751 | ||
752 | ret = uclass_get(UCLASS_GPIO, &uc); | |
753 | if (ret) | |
754 | return ret; | |
755 | ||
756 | /* Ensure that we have a base for each bank */ | |
757 | base = 0; | |
758 | uclass_foreach_dev(dev, uc) { | |
b892d127 | 759 | if (device_active(dev) && dev != removed_dev) { |
e564f054 | 760 | uc_priv = dev_get_uclass_priv(dev); |
96495d90 SG |
761 | uc_priv->gpio_base = base; |
762 | base += uc_priv->gpio_count; | |
763 | } | |
764 | } | |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
17c43f1a | 769 | int gpio_get_number(const struct gpio_desc *desc) |
56a71f89 SG |
770 | { |
771 | struct udevice *dev = desc->dev; | |
772 | struct gpio_dev_priv *uc_priv; | |
773 | ||
774 | if (!dev) | |
775 | return -1; | |
776 | uc_priv = dev->uclass_priv; | |
777 | ||
778 | return uc_priv->gpio_base + desc->offset; | |
779 | } | |
780 | ||
54c5d08a | 781 | static int gpio_post_probe(struct udevice *dev) |
96495d90 | 782 | { |
e564f054 | 783 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
b892d127 SG |
784 | |
785 | uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *)); | |
786 | if (!uc_priv->name) | |
787 | return -ENOMEM; | |
788 | ||
789 | return gpio_renumber(NULL); | |
96495d90 SG |
790 | } |
791 | ||
54c5d08a | 792 | static int gpio_pre_remove(struct udevice *dev) |
96495d90 | 793 | { |
e564f054 | 794 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
b892d127 SG |
795 | int i; |
796 | ||
797 | for (i = 0; i < uc_priv->gpio_count; i++) { | |
798 | if (uc_priv->name[i]) | |
799 | free(uc_priv->name[i]); | |
800 | } | |
801 | free(uc_priv->name); | |
802 | ||
803 | return gpio_renumber(dev); | |
96495d90 SG |
804 | } |
805 | ||
806 | UCLASS_DRIVER(gpio) = { | |
807 | .id = UCLASS_GPIO, | |
808 | .name = "gpio", | |
ae89bb0d | 809 | .flags = DM_UC_FLAG_SEQ_ALIAS, |
96495d90 SG |
810 | .post_probe = gpio_post_probe, |
811 | .pre_remove = gpio_pre_remove, | |
812 | .per_device_auto_alloc_size = sizeof(struct gpio_dev_priv), | |
813 | }; |