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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
96495d90 SG |
2 | /* |
3 | * Copyright (c) 2013 Google, Inc | |
96495d90 SG |
4 | */ |
5 | ||
6 | #include <common.h> | |
7 | #include <dm.h> | |
6c880b77 | 8 | #include <dt-bindings/gpio/gpio.h> |
96495d90 | 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 */ | |
75897910 | 70 | if (offset < uc_priv->gpio_count) |
fe1ef503 SG |
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 | ||
3a57123e SG |
116 | int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc, |
117 | struct ofnode_phandle_args *args) | |
6c880b77 EN |
118 | { |
119 | if (args->args_count < 1) | |
120 | return -EINVAL; | |
121 | ||
122 | desc->offset = args->args[0]; | |
123 | ||
124 | if (args->args_count < 2) | |
125 | return 0; | |
126 | ||
127 | if (args->args[1] & GPIO_ACTIVE_LOW) | |
128 | desc->flags = GPIOD_ACTIVE_LOW; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
3669e0e7 | 133 | static int gpio_find_and_xlate(struct gpio_desc *desc, |
3a57123e | 134 | struct ofnode_phandle_args *args) |
0dac4d51 SG |
135 | { |
136 | struct dm_gpio_ops *ops = gpio_get_ops(desc->dev); | |
137 | ||
6c880b77 EN |
138 | if (ops->xlate) |
139 | return ops->xlate(desc->dev, desc, args); | |
0dac4d51 | 140 | else |
6c880b77 | 141 | return gpio_xlate_offs_flags(desc->dev, desc, args); |
0dac4d51 SG |
142 | } |
143 | ||
efa677fb | 144 | int dm_gpio_request(struct gpio_desc *desc, const char *label) |
ae7123f8 SG |
145 | { |
146 | struct udevice *dev = desc->dev; | |
147 | struct gpio_dev_priv *uc_priv; | |
148 | char *str; | |
149 | int ret; | |
150 | ||
e564f054 | 151 | uc_priv = dev_get_uclass_priv(dev); |
ae7123f8 SG |
152 | if (uc_priv->name[desc->offset]) |
153 | return -EBUSY; | |
154 | str = strdup(label); | |
155 | if (!str) | |
156 | return -ENOMEM; | |
157 | if (gpio_get_ops(dev)->request) { | |
158 | ret = gpio_get_ops(dev)->request(dev, desc->offset, label); | |
159 | if (ret) { | |
160 | free(str); | |
161 | return ret; | |
162 | } | |
163 | } | |
164 | uc_priv->name[desc->offset] = str; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
3669e0e7 SG |
169 | static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...) |
170 | { | |
4dc5259a | 171 | #if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF) |
3669e0e7 SG |
172 | va_list args; |
173 | char buf[40]; | |
174 | ||
175 | va_start(args, fmt); | |
176 | vscnprintf(buf, sizeof(buf), fmt, args); | |
177 | va_end(args); | |
178 | return dm_gpio_request(desc, buf); | |
4dc5259a SG |
179 | #else |
180 | return dm_gpio_request(desc, fmt); | |
181 | #endif | |
3669e0e7 SG |
182 | } |
183 | ||
96495d90 SG |
184 | /** |
185 | * gpio_request() - [COMPAT] Request GPIO | |
186 | * gpio: GPIO number | |
187 | * label: Name for the requested GPIO | |
188 | * | |
b892d127 SG |
189 | * The label is copied and allocated so the caller does not need to keep |
190 | * the pointer around. | |
191 | * | |
96495d90 SG |
192 | * This function implements the API that's compatible with current |
193 | * GPIO API used in U-Boot. The request is forwarded to particular | |
194 | * GPIO driver. Returns 0 on success, negative value on error. | |
195 | */ | |
196 | int gpio_request(unsigned gpio, const char *label) | |
197 | { | |
ae7123f8 | 198 | struct gpio_desc desc; |
96495d90 SG |
199 | int ret; |
200 | ||
ae7123f8 | 201 | ret = gpio_to_device(gpio, &desc); |
96495d90 SG |
202 | if (ret) |
203 | return ret; | |
204 | ||
ae7123f8 | 205 | return dm_gpio_request(&desc, label); |
96495d90 SG |
206 | } |
207 | ||
d44f597b SG |
208 | /** |
209 | * gpio_requestf() - [COMPAT] Request GPIO | |
210 | * @gpio: GPIO number | |
211 | * @fmt: Format string for the requested GPIO | |
212 | * @...: Arguments for the printf() format string | |
213 | * | |
214 | * This function implements the API that's compatible with current | |
215 | * GPIO API used in U-Boot. The request is forwarded to particular | |
216 | * GPIO driver. Returns 0 on success, negative value on error. | |
217 | */ | |
218 | int gpio_requestf(unsigned gpio, const char *fmt, ...) | |
219 | { | |
4dc5259a | 220 | #if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF) |
d44f597b SG |
221 | va_list args; |
222 | char buf[40]; | |
223 | ||
224 | va_start(args, fmt); | |
225 | vscnprintf(buf, sizeof(buf), fmt, args); | |
226 | va_end(args); | |
227 | return gpio_request(gpio, buf); | |
4dc5259a SG |
228 | #else |
229 | return gpio_request(gpio, fmt); | |
230 | #endif | |
d44f597b SG |
231 | } |
232 | ||
ae7123f8 | 233 | int _dm_gpio_free(struct udevice *dev, uint offset) |
96495d90 | 234 | { |
b892d127 | 235 | struct gpio_dev_priv *uc_priv; |
96495d90 SG |
236 | int ret; |
237 | ||
e564f054 | 238 | uc_priv = dev_get_uclass_priv(dev); |
b892d127 SG |
239 | if (!uc_priv->name[offset]) |
240 | return -ENXIO; | |
241 | if (gpio_get_ops(dev)->free) { | |
242 | ret = gpio_get_ops(dev)->free(dev, offset); | |
243 | if (ret) | |
244 | return ret; | |
245 | } | |
246 | ||
247 | free(uc_priv->name[offset]); | |
248 | uc_priv->name[offset] = NULL; | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
ae7123f8 SG |
253 | /** |
254 | * gpio_free() - [COMPAT] Relinquish GPIO | |
255 | * gpio: GPIO number | |
256 | * | |
257 | * This function implements the API that's compatible with current | |
258 | * GPIO API used in U-Boot. The request is forwarded to particular | |
259 | * GPIO driver. Returns 0 on success, negative value on error. | |
260 | */ | |
261 | int gpio_free(unsigned gpio) | |
b892d127 | 262 | { |
ae7123f8 SG |
263 | struct gpio_desc desc; |
264 | int ret; | |
265 | ||
266 | ret = gpio_to_device(gpio, &desc); | |
267 | if (ret) | |
268 | return ret; | |
269 | ||
270 | return _dm_gpio_free(desc.dev, desc.offset); | |
271 | } | |
b892d127 | 272 | |
17c43f1a | 273 | static int check_reserved(const struct gpio_desc *desc, const char *func) |
ae7123f8 | 274 | { |
eca48665 SG |
275 | struct gpio_dev_priv *uc_priv; |
276 | ||
277 | if (!dm_gpio_is_valid(desc)) | |
278 | return -ENOENT; | |
ae7123f8 | 279 | |
eca48665 | 280 | uc_priv = dev_get_uclass_priv(desc->dev); |
ae7123f8 | 281 | if (!uc_priv->name[desc->offset]) { |
b892d127 | 282 | printf("%s: %s: error: gpio %s%d not reserved\n", |
ae7123f8 SG |
283 | desc->dev->name, func, |
284 | uc_priv->bank_name ? uc_priv->bank_name : "", | |
285 | desc->offset); | |
b892d127 SG |
286 | return -EBUSY; |
287 | } | |
288 | ||
289 | return 0; | |
96495d90 SG |
290 | } |
291 | ||
292 | /** | |
293 | * gpio_direction_input() - [COMPAT] Set GPIO direction to input | |
294 | * gpio: GPIO number | |
295 | * | |
296 | * This function implements the API that's compatible with current | |
297 | * GPIO API used in U-Boot. The request is forwarded to particular | |
298 | * GPIO driver. Returns 0 on success, negative value on error. | |
299 | */ | |
300 | int gpio_direction_input(unsigned gpio) | |
301 | { | |
ae7123f8 | 302 | struct gpio_desc desc; |
96495d90 SG |
303 | int ret; |
304 | ||
ae7123f8 SG |
305 | ret = gpio_to_device(gpio, &desc); |
306 | if (ret) | |
307 | return ret; | |
308 | ret = check_reserved(&desc, "dir_input"); | |
96495d90 SG |
309 | if (ret) |
310 | return ret; | |
311 | ||
ae7123f8 | 312 | return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset); |
96495d90 SG |
313 | } |
314 | ||
315 | /** | |
316 | * gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value | |
317 | * gpio: GPIO number | |
318 | * value: Logical value to be set on the GPIO pin | |
319 | * | |
320 | * This function implements the API that's compatible with current | |
321 | * GPIO API used in U-Boot. The request is forwarded to particular | |
322 | * GPIO driver. Returns 0 on success, negative value on error. | |
323 | */ | |
324 | int gpio_direction_output(unsigned gpio, int value) | |
325 | { | |
ae7123f8 | 326 | struct gpio_desc desc; |
96495d90 SG |
327 | int ret; |
328 | ||
ae7123f8 SG |
329 | ret = gpio_to_device(gpio, &desc); |
330 | if (ret) | |
331 | return ret; | |
332 | ret = check_reserved(&desc, "dir_output"); | |
333 | if (ret) | |
334 | return ret; | |
335 | ||
336 | return gpio_get_ops(desc.dev)->direction_output(desc.dev, | |
337 | desc.offset, value); | |
338 | } | |
339 | ||
17c43f1a | 340 | int dm_gpio_get_value(const struct gpio_desc *desc) |
ae7123f8 SG |
341 | { |
342 | int value; | |
343 | int ret; | |
344 | ||
345 | ret = check_reserved(desc, "get_value"); | |
96495d90 SG |
346 | if (ret) |
347 | return ret; | |
348 | ||
ae7123f8 SG |
349 | value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset); |
350 | ||
351 | return desc->flags & GPIOD_ACTIVE_LOW ? !value : value; | |
352 | } | |
353 | ||
17c43f1a | 354 | int dm_gpio_set_value(const struct gpio_desc *desc, int value) |
ae7123f8 SG |
355 | { |
356 | int ret; | |
357 | ||
358 | ret = check_reserved(desc, "set_value"); | |
359 | if (ret) | |
360 | return ret; | |
361 | ||
362 | if (desc->flags & GPIOD_ACTIVE_LOW) | |
363 | value = !value; | |
364 | gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value); | |
365 | return 0; | |
366 | } | |
367 | ||
53ecdfb9 | 368 | int dm_gpio_get_open_drain(struct gpio_desc *desc) |
369 | { | |
370 | struct dm_gpio_ops *ops = gpio_get_ops(desc->dev); | |
371 | int ret; | |
372 | ||
373 | ret = check_reserved(desc, "get_open_drain"); | |
374 | if (ret) | |
375 | return ret; | |
376 | ||
377 | if (ops->set_open_drain) | |
378 | return ops->get_open_drain(desc->dev, desc->offset); | |
379 | else | |
380 | return -ENOSYS; | |
381 | } | |
382 | ||
383 | int dm_gpio_set_open_drain(struct gpio_desc *desc, int value) | |
384 | { | |
385 | struct dm_gpio_ops *ops = gpio_get_ops(desc->dev); | |
386 | int ret; | |
387 | ||
388 | ret = check_reserved(desc, "set_open_drain"); | |
389 | if (ret) | |
390 | return ret; | |
391 | ||
392 | if (ops->set_open_drain) | |
393 | ret = ops->set_open_drain(desc->dev, desc->offset, value); | |
394 | else | |
395 | return 0; /* feature not supported -> ignore setting */ | |
396 | ||
397 | return ret; | |
398 | } | |
399 | ||
ae7123f8 SG |
400 | int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags) |
401 | { | |
402 | struct udevice *dev = desc->dev; | |
403 | struct dm_gpio_ops *ops = gpio_get_ops(dev); | |
404 | int ret; | |
405 | ||
406 | ret = check_reserved(desc, "set_dir"); | |
407 | if (ret) | |
408 | return ret; | |
409 | ||
410 | if (flags & GPIOD_IS_OUT) { | |
411 | int value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0; | |
412 | ||
413 | if (flags & GPIOD_ACTIVE_LOW) | |
414 | value = !value; | |
415 | ret = ops->direction_output(dev, desc->offset, value); | |
416 | } else if (flags & GPIOD_IS_IN) { | |
417 | ret = ops->direction_input(dev, desc->offset); | |
418 | } | |
419 | if (ret) | |
420 | return ret; | |
421 | /* | |
422 | * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in | |
423 | * futures | |
424 | */ | |
425 | desc->flags = flags; | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | int dm_gpio_set_dir(struct gpio_desc *desc) | |
431 | { | |
432 | return dm_gpio_set_dir_flags(desc, desc->flags); | |
96495d90 SG |
433 | } |
434 | ||
435 | /** | |
436 | * gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value | |
437 | * gpio: GPIO number | |
438 | * | |
439 | * This function implements the API that's compatible with current | |
440 | * GPIO API used in U-Boot. The request is forwarded to particular | |
441 | * GPIO driver. Returns the value of the GPIO pin, or negative value | |
442 | * on error. | |
443 | */ | |
444 | int gpio_get_value(unsigned gpio) | |
445 | { | |
96495d90 SG |
446 | int ret; |
447 | ||
ae7123f8 SG |
448 | struct gpio_desc desc; |
449 | ||
450 | ret = gpio_to_device(gpio, &desc); | |
96495d90 SG |
451 | if (ret) |
452 | return ret; | |
ae7123f8 | 453 | return dm_gpio_get_value(&desc); |
96495d90 SG |
454 | } |
455 | ||
456 | /** | |
457 | * gpio_set_value() - [COMPAT] Configure logical value on GPIO pin | |
458 | * gpio: GPIO number | |
459 | * value: Logical value to be set on the GPIO pin. | |
460 | * | |
461 | * This function implements the API that's compatible with current | |
462 | * GPIO API used in U-Boot. The request is forwarded to particular | |
463 | * GPIO driver. Returns 0 on success, negative value on error. | |
464 | */ | |
465 | int gpio_set_value(unsigned gpio, int value) | |
466 | { | |
ae7123f8 | 467 | struct gpio_desc desc; |
96495d90 SG |
468 | int ret; |
469 | ||
ae7123f8 | 470 | ret = gpio_to_device(gpio, &desc); |
96495d90 SG |
471 | if (ret) |
472 | return ret; | |
ae7123f8 | 473 | return dm_gpio_set_value(&desc, value); |
96495d90 SG |
474 | } |
475 | ||
54c5d08a | 476 | const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) |
96495d90 SG |
477 | { |
478 | struct gpio_dev_priv *priv; | |
479 | ||
480 | /* Must be called on an active device */ | |
e564f054 | 481 | priv = dev_get_uclass_priv(dev); |
96495d90 SG |
482 | assert(priv); |
483 | ||
484 | *bit_count = priv->gpio_count; | |
485 | return priv->bank_name; | |
486 | } | |
487 | ||
6449a506 SG |
488 | static const char * const gpio_function[GPIOF_COUNT] = { |
489 | "input", | |
490 | "output", | |
491 | "unused", | |
492 | "unknown", | |
493 | "func", | |
494 | }; | |
495 | ||
fb07f97d MY |
496 | static int get_function(struct udevice *dev, int offset, bool skip_unused, |
497 | const char **namep) | |
6449a506 | 498 | { |
e564f054 | 499 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
6449a506 SG |
500 | struct dm_gpio_ops *ops = gpio_get_ops(dev); |
501 | ||
502 | BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); | |
503 | if (!device_active(dev)) | |
504 | return -ENODEV; | |
505 | if (offset < 0 || offset >= uc_priv->gpio_count) | |
506 | return -EINVAL; | |
507 | if (namep) | |
508 | *namep = uc_priv->name[offset]; | |
509 | if (skip_unused && !uc_priv->name[offset]) | |
510 | return GPIOF_UNUSED; | |
511 | if (ops->get_function) { | |
512 | int ret; | |
513 | ||
514 | ret = ops->get_function(dev, offset); | |
515 | if (ret < 0) | |
516 | return ret; | |
517 | if (ret >= ARRAY_SIZE(gpio_function)) | |
518 | return -ENODATA; | |
519 | return ret; | |
520 | } | |
521 | ||
522 | return GPIOF_UNKNOWN; | |
523 | } | |
524 | ||
525 | int gpio_get_function(struct udevice *dev, int offset, const char **namep) | |
526 | { | |
527 | return get_function(dev, offset, true, namep); | |
528 | } | |
529 | ||
530 | int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep) | |
531 | { | |
532 | return get_function(dev, offset, false, namep); | |
533 | } | |
534 | ||
0757535a SG |
535 | int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize) |
536 | { | |
537 | struct dm_gpio_ops *ops = gpio_get_ops(dev); | |
538 | struct gpio_dev_priv *priv; | |
539 | char *str = buf; | |
540 | int func; | |
541 | int ret; | |
542 | int len; | |
543 | ||
544 | BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); | |
545 | ||
546 | *buf = 0; | |
e564f054 | 547 | priv = dev_get_uclass_priv(dev); |
0757535a SG |
548 | ret = gpio_get_raw_function(dev, offset, NULL); |
549 | if (ret < 0) | |
550 | return ret; | |
551 | func = ret; | |
552 | len = snprintf(str, buffsize, "%s%d: %s", | |
553 | priv->bank_name ? priv->bank_name : "", | |
554 | offset, gpio_function[func]); | |
555 | if (func == GPIOF_INPUT || func == GPIOF_OUTPUT || | |
556 | func == GPIOF_UNUSED) { | |
557 | const char *label; | |
558 | bool used; | |
559 | ||
560 | ret = ops->get_value(dev, offset); | |
561 | if (ret < 0) | |
562 | return ret; | |
563 | used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED; | |
564 | snprintf(str + len, buffsize - len, ": %d [%c]%s%s", | |
565 | ret, | |
566 | used ? 'x' : ' ', | |
567 | used ? " " : "", | |
568 | label ? label : ""); | |
569 | } | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
962f5caf SG |
574 | int gpio_claim_vector(const int *gpio_num_array, const char *fmt) |
575 | { | |
576 | int i, ret; | |
577 | int gpio; | |
578 | ||
579 | for (i = 0; i < 32; i++) { | |
580 | gpio = gpio_num_array[i]; | |
581 | if (gpio == -1) | |
582 | break; | |
583 | ret = gpio_requestf(gpio, fmt, i); | |
584 | if (ret) | |
585 | goto err; | |
586 | ret = gpio_direction_input(gpio); | |
587 | if (ret) { | |
588 | gpio_free(gpio); | |
589 | goto err; | |
590 | } | |
591 | } | |
592 | ||
593 | return 0; | |
594 | err: | |
595 | for (i--; i >= 0; i--) | |
596 | gpio_free(gpio_num_array[i]); | |
597 | ||
598 | return ret; | |
599 | } | |
600 | ||
e5901c94 SG |
601 | /* |
602 | * get a number comprised of multiple GPIO values. gpio_num_array points to | |
603 | * the array of gpio pin numbers to scan, terminated by -1. | |
604 | */ | |
962f5caf | 605 | int gpio_get_values_as_int(const int *gpio_list) |
e5901c94 SG |
606 | { |
607 | int gpio; | |
608 | unsigned bitmask = 1; | |
609 | unsigned vector = 0; | |
962f5caf | 610 | int ret; |
e5901c94 SG |
611 | |
612 | while (bitmask && | |
962f5caf SG |
613 | ((gpio = *gpio_list++) != -1)) { |
614 | ret = gpio_get_value(gpio); | |
615 | if (ret < 0) | |
616 | return ret; | |
617 | else if (ret) | |
e5901c94 SG |
618 | vector |= bitmask; |
619 | bitmask <<= 1; | |
620 | } | |
962f5caf | 621 | |
e5901c94 SG |
622 | return vector; |
623 | } | |
624 | ||
17c43f1a | 625 | int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count) |
bbf24780 SG |
626 | { |
627 | unsigned bitmask = 1; | |
628 | unsigned vector = 0; | |
629 | int ret, i; | |
630 | ||
631 | for (i = 0; i < count; i++) { | |
632 | ret = dm_gpio_get_value(&desc_list[i]); | |
633 | if (ret < 0) | |
634 | return ret; | |
635 | else if (ret) | |
636 | vector |= bitmask; | |
637 | bitmask <<= 1; | |
638 | } | |
639 | ||
640 | return vector; | |
641 | } | |
642 | ||
3a57123e SG |
643 | static int gpio_request_tail(int ret, ofnode node, |
644 | struct ofnode_phandle_args *args, | |
645 | const char *list_name, int index, | |
646 | struct gpio_desc *desc, int flags, bool add_index) | |
3669e0e7 | 647 | { |
3669e0e7 SG |
648 | desc->dev = NULL; |
649 | desc->offset = 0; | |
6c880b77 | 650 | desc->flags = 0; |
3a57123e | 651 | if (ret) |
3669e0e7 | 652 | goto err; |
3669e0e7 | 653 | |
3a57123e SG |
654 | ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node, |
655 | &desc->dev); | |
3669e0e7 | 656 | if (ret) { |
b053dd7c | 657 | debug("%s: uclass_get_device_by_ofnode failed\n", __func__); |
3669e0e7 SG |
658 | goto err; |
659 | } | |
3a57123e | 660 | ret = gpio_find_and_xlate(desc, args); |
3669e0e7 SG |
661 | if (ret) { |
662 | debug("%s: gpio_find_and_xlate failed\n", __func__); | |
663 | goto err; | |
664 | } | |
665 | ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s", | |
3a57123e | 666 | ofnode_get_name(node), |
3669e0e7 SG |
667 | list_name, index); |
668 | if (ret) { | |
669 | debug("%s: dm_gpio_requestf failed\n", __func__); | |
670 | goto err; | |
671 | } | |
672 | ret = dm_gpio_set_dir_flags(desc, flags | desc->flags); | |
673 | if (ret) { | |
674 | debug("%s: dm_gpio_set_dir failed\n", __func__); | |
675 | goto err; | |
676 | } | |
677 | ||
678 | return 0; | |
679 | err: | |
680 | debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n", | |
3a57123e | 681 | __func__, ofnode_get_name(node), list_name, index, ret); |
3669e0e7 SG |
682 | return ret; |
683 | } | |
684 | ||
150c5afe SG |
685 | static int _gpio_request_by_name_nodev(ofnode node, const char *list_name, |
686 | int index, struct gpio_desc *desc, | |
687 | int flags, bool add_index) | |
3a57123e SG |
688 | { |
689 | struct ofnode_phandle_args args; | |
690 | int ret; | |
691 | ||
150c5afe SG |
692 | ret = ofnode_parse_phandle_with_args(node, list_name, "#gpio-cells", 0, |
693 | index, &args); | |
3a57123e | 694 | |
150c5afe SG |
695 | return gpio_request_tail(ret, node, &args, list_name, index, desc, |
696 | flags, add_index); | |
3a57123e SG |
697 | } |
698 | ||
150c5afe | 699 | int gpio_request_by_name_nodev(ofnode node, const char *list_name, int index, |
3669e0e7 SG |
700 | struct gpio_desc *desc, int flags) |
701 | { | |
150c5afe SG |
702 | return _gpio_request_by_name_nodev(node, list_name, index, desc, flags, |
703 | index > 0); | |
3669e0e7 SG |
704 | } |
705 | ||
150c5afe | 706 | int gpio_request_by_name(struct udevice *dev, const char *list_name, int index, |
3669e0e7 SG |
707 | struct gpio_desc *desc, int flags) |
708 | { | |
150c5afe SG |
709 | struct ofnode_phandle_args args; |
710 | int ret; | |
711 | ||
712 | ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0, | |
713 | index, &args); | |
714 | ||
715 | return gpio_request_tail(ret, dev_ofnode(dev), &args, list_name, | |
716 | index, desc, flags, index > 0); | |
3669e0e7 SG |
717 | } |
718 | ||
150c5afe | 719 | int gpio_request_list_by_name_nodev(ofnode node, const char *list_name, |
3669e0e7 SG |
720 | struct gpio_desc *desc, int max_count, |
721 | int flags) | |
722 | { | |
723 | int count; | |
724 | int ret; | |
725 | ||
2984e7a1 | 726 | for (count = 0; count < max_count; count++) { |
150c5afe | 727 | ret = _gpio_request_by_name_nodev(node, list_name, count, |
3669e0e7 SG |
728 | &desc[count], flags, true); |
729 | if (ret == -ENOENT) | |
730 | break; | |
731 | else if (ret) | |
732 | goto err; | |
733 | } | |
734 | ||
735 | /* We ran out of GPIOs in the list */ | |
736 | return count; | |
737 | ||
738 | err: | |
739 | gpio_free_list_nodev(desc, count - 1); | |
740 | ||
741 | return ret; | |
742 | } | |
743 | ||
744 | int gpio_request_list_by_name(struct udevice *dev, const char *list_name, | |
745 | struct gpio_desc *desc, int max_count, | |
746 | int flags) | |
747 | { | |
748 | /* | |
749 | * This isn't ideal since we don't use dev->name in the debug() | |
750 | * calls in gpio_request_by_name(), but we can do this until | |
751 | * gpio_request_list_by_name_nodev() can be dropped. | |
752 | */ | |
150c5afe SG |
753 | return gpio_request_list_by_name_nodev(dev_ofnode(dev), list_name, desc, |
754 | max_count, flags); | |
3669e0e7 SG |
755 | } |
756 | ||
757 | int gpio_get_list_count(struct udevice *dev, const char *list_name) | |
758 | { | |
759 | int ret; | |
760 | ||
e160f7d4 | 761 | ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev), |
3669e0e7 SG |
762 | list_name, "#gpio-cells", 0, -1, |
763 | NULL); | |
764 | if (ret) { | |
765 | debug("%s: Node '%s', property '%s', GPIO count failed: %d\n", | |
766 | __func__, dev->name, list_name, ret); | |
767 | } | |
768 | ||
769 | return ret; | |
770 | } | |
771 | ||
772 | int dm_gpio_free(struct udevice *dev, struct gpio_desc *desc) | |
773 | { | |
774 | /* For now, we don't do any checking of dev */ | |
775 | return _dm_gpio_free(desc->dev, desc->offset); | |
776 | } | |
777 | ||
778 | int gpio_free_list(struct udevice *dev, struct gpio_desc *desc, int count) | |
779 | { | |
780 | int i; | |
781 | ||
782 | /* For now, we don't do any checking of dev */ | |
783 | for (i = 0; i < count; i++) | |
784 | dm_gpio_free(dev, &desc[i]); | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | int gpio_free_list_nodev(struct gpio_desc *desc, int count) | |
790 | { | |
791 | return gpio_free_list(NULL, desc, count); | |
792 | } | |
793 | ||
96495d90 | 794 | /* We need to renumber the GPIOs when any driver is probed/removed */ |
b892d127 | 795 | static int gpio_renumber(struct udevice *removed_dev) |
96495d90 SG |
796 | { |
797 | struct gpio_dev_priv *uc_priv; | |
54c5d08a | 798 | struct udevice *dev; |
96495d90 SG |
799 | struct uclass *uc; |
800 | unsigned base; | |
801 | int ret; | |
802 | ||
803 | ret = uclass_get(UCLASS_GPIO, &uc); | |
804 | if (ret) | |
805 | return ret; | |
806 | ||
807 | /* Ensure that we have a base for each bank */ | |
808 | base = 0; | |
809 | uclass_foreach_dev(dev, uc) { | |
b892d127 | 810 | if (device_active(dev) && dev != removed_dev) { |
e564f054 | 811 | uc_priv = dev_get_uclass_priv(dev); |
96495d90 SG |
812 | uc_priv->gpio_base = base; |
813 | base += uc_priv->gpio_count; | |
814 | } | |
815 | } | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
17c43f1a | 820 | int gpio_get_number(const struct gpio_desc *desc) |
56a71f89 SG |
821 | { |
822 | struct udevice *dev = desc->dev; | |
823 | struct gpio_dev_priv *uc_priv; | |
824 | ||
825 | if (!dev) | |
826 | return -1; | |
827 | uc_priv = dev->uclass_priv; | |
828 | ||
829 | return uc_priv->gpio_base + desc->offset; | |
830 | } | |
831 | ||
54c5d08a | 832 | static int gpio_post_probe(struct udevice *dev) |
96495d90 | 833 | { |
e564f054 | 834 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
b892d127 SG |
835 | |
836 | uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *)); | |
837 | if (!uc_priv->name) | |
838 | return -ENOMEM; | |
839 | ||
840 | return gpio_renumber(NULL); | |
96495d90 SG |
841 | } |
842 | ||
54c5d08a | 843 | static int gpio_pre_remove(struct udevice *dev) |
96495d90 | 844 | { |
e564f054 | 845 | struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); |
b892d127 SG |
846 | int i; |
847 | ||
848 | for (i = 0; i < uc_priv->gpio_count; i++) { | |
849 | if (uc_priv->name[i]) | |
850 | free(uc_priv->name[i]); | |
851 | } | |
852 | free(uc_priv->name); | |
853 | ||
854 | return gpio_renumber(dev); | |
96495d90 SG |
855 | } |
856 | ||
857 | UCLASS_DRIVER(gpio) = { | |
858 | .id = UCLASS_GPIO, | |
859 | .name = "gpio", | |
ae89bb0d | 860 | .flags = DM_UC_FLAG_SEQ_ALIAS, |
96495d90 SG |
861 | .post_probe = gpio_post_probe, |
862 | .pre_remove = gpio_pre_remove, | |
863 | .per_device_auto_alloc_size = sizeof(struct gpio_dev_priv), | |
864 | }; |