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