blob: 9ab9df4ce7a6cd5afd1a78813c13560a40265a29 [file] [log] [blame]
Simon Glass96495d92014-02-26 15:59:24 -07001/*
2 * Copyright (c) 2013 Google, Inc
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
Eric Nelson6c880b72016-04-24 16:32:40 -07009#include <dt-bindings/gpio/gpio.h>
Simon Glass96495d92014-02-26 15:59:24 -070010#include <errno.h>
Simon Glass0dac4d52015-01-05 20:05:28 -070011#include <fdtdec.h>
Simon Glassb892d122014-10-04 11:29:42 -060012#include <malloc.h>
Simon Glass96495d92014-02-26 15:59:24 -070013#include <asm/gpio.h>
Masahiro Yamada84b8bf62016-01-24 23:27:48 +090014#include <linux/bug.h>
Simon Glassfe1ef502014-10-22 21:37:01 -060015#include <linux/ctype.h>
Simon Glass96495d92014-02-26 15:59:24 -070016
Simon Glass3669e0e2015-01-05 20:05:29 -070017DECLARE_GLOBAL_DATA_PTR;
18
Simon Glass96495d92014-02-26 15:59:24 -070019/**
20 * gpio_to_device() - Convert global GPIO number to device, number
Simon Glass96495d92014-02-26 15:59:24 -070021 *
22 * Convert the GPIO number to an entry in the list of GPIOs
23 * or GPIO blocks registered with the GPIO controller. Returns
24 * entry on success, NULL on error.
Simon Glassae7123f2015-01-05 20:05:27 -070025 *
26 * @gpio: The numeric representation of the GPIO
27 * @desc: Returns description (desc->flags will always be 0)
28 * @return 0 if found, -ENOENT if not found
Simon Glass96495d92014-02-26 15:59:24 -070029 */
Simon Glassae7123f2015-01-05 20:05:27 -070030static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
Simon Glass96495d92014-02-26 15:59:24 -070031{
32 struct gpio_dev_priv *uc_priv;
Heiko Schocher54c5d082014-05-22 12:43:05 +020033 struct udevice *dev;
Simon Glass96495d92014-02-26 15:59:24 -070034 int ret;
35
36 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
37 dev;
38 ret = uclass_next_device(&dev)) {
Simon Glasse564f052015-03-05 12:25:20 -070039 uc_priv = dev_get_uclass_priv(dev);
Simon Glass96495d92014-02-26 15:59:24 -070040 if (gpio >= uc_priv->gpio_base &&
41 gpio < uc_priv->gpio_base + uc_priv->gpio_count) {
Simon Glassae7123f2015-01-05 20:05:27 -070042 desc->dev = dev;
43 desc->offset = gpio - uc_priv->gpio_base;
44 desc->flags = 0;
Simon Glass96495d92014-02-26 15:59:24 -070045 return 0;
46 }
47 }
48
49 /* No such GPIO */
Simon Glassae7123f2015-01-05 20:05:27 -070050 return ret ? ret : -ENOENT;
Simon Glass96495d92014-02-26 15:59:24 -070051}
52
Simon Glass32ec1592015-06-23 15:38:40 -060053int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
Simon Glass96495d92014-02-26 15:59:24 -070054{
Simon Glassfe1ef502014-10-22 21:37:01 -060055 struct gpio_dev_priv *uc_priv = NULL;
Heiko Schocher54c5d082014-05-22 12:43:05 +020056 struct udevice *dev;
Simon Glassfe1ef502014-10-22 21:37:01 -060057 ulong offset;
58 int numeric;
Simon Glass96495d92014-02-26 15:59:24 -070059 int ret;
60
Simon Glassfe1ef502014-10-22 21:37:01 -060061 numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1;
Simon Glass96495d92014-02-26 15:59:24 -070062 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
63 dev;
64 ret = uclass_next_device(&dev)) {
Simon Glass96495d92014-02-26 15:59:24 -070065 int len;
66
Simon Glasse564f052015-03-05 12:25:20 -070067 uc_priv = dev_get_uclass_priv(dev);
Simon Glassfe1ef502014-10-22 21:37:01 -060068 if (numeric != -1) {
69 offset = numeric - uc_priv->gpio_base;
70 /* Allow GPIOs to be numbered from 0 */
71 if (offset >= 0 && offset < uc_priv->gpio_count)
72 break;
73 }
74
Simon Glass96495d92014-02-26 15:59:24 -070075 len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0;
76
Simon Glass939cda52014-06-11 23:29:47 -060077 if (!strncasecmp(name, uc_priv->bank_name, len)) {
Simon Glassfe1ef502014-10-22 21:37:01 -060078 if (!strict_strtoul(name + len, 10, &offset))
79 break;
Simon Glass96495d92014-02-26 15:59:24 -070080 }
81 }
82
Simon Glassfe1ef502014-10-22 21:37:01 -060083 if (!dev)
84 return ret ? ret : -EINVAL;
85
Simon Glass32ec1592015-06-23 15:38:40 -060086 desc->dev = dev;
87 desc->offset = offset;
88
89 return 0;
90}
91
92int gpio_lookup_name(const char *name, struct udevice **devp,
93 unsigned int *offsetp, unsigned int *gpiop)
94{
95 struct gpio_desc desc;
96 int ret;
97
Simon Glassfe1ef502014-10-22 21:37:01 -060098 if (devp)
Simon Glass32ec1592015-06-23 15:38:40 -060099 *devp = NULL;
100 ret = dm_gpio_lookup_name(name, &desc);
101 if (ret)
102 return ret;
103
104 if (devp)
105 *devp = desc.dev;
Simon Glassfe1ef502014-10-22 21:37:01 -0600106 if (offsetp)
Simon Glass32ec1592015-06-23 15:38:40 -0600107 *offsetp = desc.offset;
108 if (gpiop) {
109 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc.dev);
110
111 *gpiop = uc_priv->gpio_base + desc.offset;
112 }
Simon Glassfe1ef502014-10-22 21:37:01 -0600113
114 return 0;
Simon Glass96495d92014-02-26 15:59:24 -0700115}
116
Eric Nelson6c880b72016-04-24 16:32:40 -0700117int gpio_xlate_offs_flags(struct udevice *dev,
118 struct gpio_desc *desc,
119 struct fdtdec_phandle_args *args)
120{
121 if (args->args_count < 1)
122 return -EINVAL;
123
124 desc->offset = args->args[0];
125
126 if (args->args_count < 2)
127 return 0;
128
129 if (args->args[1] & GPIO_ACTIVE_LOW)
130 desc->flags = GPIOD_ACTIVE_LOW;
131
132 return 0;
133}
134
Simon Glass3669e0e2015-01-05 20:05:29 -0700135static int gpio_find_and_xlate(struct gpio_desc *desc,
136 struct fdtdec_phandle_args *args)
Simon Glass0dac4d52015-01-05 20:05:28 -0700137{
138 struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
139
Eric Nelson6c880b72016-04-24 16:32:40 -0700140 if (ops->xlate)
141 return ops->xlate(desc->dev, desc, args);
Simon Glass0dac4d52015-01-05 20:05:28 -0700142 else
Eric Nelson6c880b72016-04-24 16:32:40 -0700143 return gpio_xlate_offs_flags(desc->dev, desc, args);
Simon Glass0dac4d52015-01-05 20:05:28 -0700144}
145
Simon Glassefa677f2015-06-23 15:38:41 -0600146int dm_gpio_request(struct gpio_desc *desc, const char *label)
Simon Glassae7123f2015-01-05 20:05:27 -0700147{
148 struct udevice *dev = desc->dev;
149 struct gpio_dev_priv *uc_priv;
150 char *str;
151 int ret;
152
Simon Glasse564f052015-03-05 12:25:20 -0700153 uc_priv = dev_get_uclass_priv(dev);
Simon Glassae7123f2015-01-05 20:05:27 -0700154 if (uc_priv->name[desc->offset])
155 return -EBUSY;
156 str = strdup(label);
157 if (!str)
158 return -ENOMEM;
159 if (gpio_get_ops(dev)->request) {
160 ret = gpio_get_ops(dev)->request(dev, desc->offset, label);
161 if (ret) {
162 free(str);
163 return ret;
164 }
165 }
166 uc_priv->name[desc->offset] = str;
167
168 return 0;
169}
170
Simon Glass3669e0e2015-01-05 20:05:29 -0700171static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...)
172{
Simon Glass4dc52592015-12-29 05:22:48 -0700173#if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF)
Simon Glass3669e0e2015-01-05 20:05:29 -0700174 va_list args;
175 char buf[40];
176
177 va_start(args, fmt);
178 vscnprintf(buf, sizeof(buf), fmt, args);
179 va_end(args);
180 return dm_gpio_request(desc, buf);
Simon Glass4dc52592015-12-29 05:22:48 -0700181#else
182 return dm_gpio_request(desc, fmt);
183#endif
Simon Glass3669e0e2015-01-05 20:05:29 -0700184}
185
Simon Glass96495d92014-02-26 15:59:24 -0700186/**
187 * gpio_request() - [COMPAT] Request GPIO
188 * gpio: GPIO number
189 * label: Name for the requested GPIO
190 *
Simon Glassb892d122014-10-04 11:29:42 -0600191 * The label is copied and allocated so the caller does not need to keep
192 * the pointer around.
193 *
Simon Glass96495d92014-02-26 15:59:24 -0700194 * This function implements the API that's compatible with current
195 * GPIO API used in U-Boot. The request is forwarded to particular
196 * GPIO driver. Returns 0 on success, negative value on error.
197 */
198int gpio_request(unsigned gpio, const char *label)
199{
Simon Glassae7123f2015-01-05 20:05:27 -0700200 struct gpio_desc desc;
Simon Glass96495d92014-02-26 15:59:24 -0700201 int ret;
202
Simon Glassae7123f2015-01-05 20:05:27 -0700203 ret = gpio_to_device(gpio, &desc);
Simon Glass96495d92014-02-26 15:59:24 -0700204 if (ret)
205 return ret;
206
Simon Glassae7123f2015-01-05 20:05:27 -0700207 return dm_gpio_request(&desc, label);
Simon Glass96495d92014-02-26 15:59:24 -0700208}
209
210/**
Simon Glassd44f5972014-10-04 11:29:49 -0600211 * gpio_requestf() - [COMPAT] Request GPIO
212 * @gpio: GPIO number
213 * @fmt: Format string for the requested GPIO
214 * @...: Arguments for the printf() format string
215 *
216 * This function implements the API that's compatible with current
217 * GPIO API used in U-Boot. The request is forwarded to particular
218 * GPIO driver. Returns 0 on success, negative value on error.
219 */
220int gpio_requestf(unsigned gpio, const char *fmt, ...)
221{
Simon Glass4dc52592015-12-29 05:22:48 -0700222#if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF)
Simon Glassd44f5972014-10-04 11:29:49 -0600223 va_list args;
224 char buf[40];
225
226 va_start(args, fmt);
227 vscnprintf(buf, sizeof(buf), fmt, args);
228 va_end(args);
229 return gpio_request(gpio, buf);
Simon Glass4dc52592015-12-29 05:22:48 -0700230#else
231 return gpio_request(gpio, fmt);
232#endif
Simon Glassd44f5972014-10-04 11:29:49 -0600233}
234
Simon Glassae7123f2015-01-05 20:05:27 -0700235int _dm_gpio_free(struct udevice *dev, uint offset)
Simon Glass96495d92014-02-26 15:59:24 -0700236{
Simon Glassb892d122014-10-04 11:29:42 -0600237 struct gpio_dev_priv *uc_priv;
Simon Glass96495d92014-02-26 15:59:24 -0700238 int ret;
239
Simon Glasse564f052015-03-05 12:25:20 -0700240 uc_priv = dev_get_uclass_priv(dev);
Simon Glassb892d122014-10-04 11:29:42 -0600241 if (!uc_priv->name[offset])
242 return -ENXIO;
243 if (gpio_get_ops(dev)->free) {
244 ret = gpio_get_ops(dev)->free(dev, offset);
245 if (ret)
246 return ret;
247 }
248
249 free(uc_priv->name[offset]);
250 uc_priv->name[offset] = NULL;
251
252 return 0;
253}
254
Simon Glassae7123f2015-01-05 20:05:27 -0700255/**
256 * gpio_free() - [COMPAT] Relinquish GPIO
257 * gpio: GPIO number
258 *
259 * This function implements the API that's compatible with current
260 * GPIO API used in U-Boot. The request is forwarded to particular
261 * GPIO driver. Returns 0 on success, negative value on error.
262 */
263int gpio_free(unsigned gpio)
Simon Glassb892d122014-10-04 11:29:42 -0600264{
Simon Glassae7123f2015-01-05 20:05:27 -0700265 struct gpio_desc desc;
266 int ret;
Simon Glassb892d122014-10-04 11:29:42 -0600267
Simon Glassae7123f2015-01-05 20:05:27 -0700268 ret = gpio_to_device(gpio, &desc);
269 if (ret)
270 return ret;
271
272 return _dm_gpio_free(desc.dev, desc.offset);
273}
274
Simon Glass17c43f12016-03-06 19:27:51 -0700275static int check_reserved(const struct gpio_desc *desc, const char *func)
Simon Glassae7123f2015-01-05 20:05:27 -0700276{
Simon Glasseca48662015-07-02 18:16:16 -0600277 struct gpio_dev_priv *uc_priv;
Simon Glassae7123f2015-01-05 20:05:27 -0700278
Simon Glasseca48662015-07-02 18:16:16 -0600279 if (!dm_gpio_is_valid(desc))
280 return -ENOENT;
281
282 uc_priv = dev_get_uclass_priv(desc->dev);
Simon Glassae7123f2015-01-05 20:05:27 -0700283 if (!uc_priv->name[desc->offset]) {
Simon Glassb892d122014-10-04 11:29:42 -0600284 printf("%s: %s: error: gpio %s%d not reserved\n",
Simon Glassae7123f2015-01-05 20:05:27 -0700285 desc->dev->name, func,
286 uc_priv->bank_name ? uc_priv->bank_name : "",
287 desc->offset);
Simon Glassb892d122014-10-04 11:29:42 -0600288 return -EBUSY;
289 }
290
291 return 0;
Simon Glass96495d92014-02-26 15:59:24 -0700292}
293
294/**
295 * gpio_direction_input() - [COMPAT] Set GPIO direction to input
296 * gpio: GPIO number
297 *
298 * This function implements the API that's compatible with current
299 * GPIO API used in U-Boot. The request is forwarded to particular
300 * GPIO driver. Returns 0 on success, negative value on error.
301 */
302int gpio_direction_input(unsigned gpio)
303{
Simon Glassae7123f2015-01-05 20:05:27 -0700304 struct gpio_desc desc;
Simon Glass96495d92014-02-26 15:59:24 -0700305 int ret;
306
Simon Glassae7123f2015-01-05 20:05:27 -0700307 ret = gpio_to_device(gpio, &desc);
Simon Glass96495d92014-02-26 15:59:24 -0700308 if (ret)
309 return ret;
Simon Glassae7123f2015-01-05 20:05:27 -0700310 ret = check_reserved(&desc, "dir_input");
311 if (ret)
312 return ret;
Simon Glass96495d92014-02-26 15:59:24 -0700313
Simon Glassae7123f2015-01-05 20:05:27 -0700314 return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset);
Simon Glass96495d92014-02-26 15:59:24 -0700315}
316
317/**
318 * gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value
319 * gpio: GPIO number
320 * value: Logical value to be set on the GPIO pin
321 *
322 * This function implements the API that's compatible with current
323 * GPIO API used in U-Boot. The request is forwarded to particular
324 * GPIO driver. Returns 0 on success, negative value on error.
325 */
326int gpio_direction_output(unsigned gpio, int value)
327{
Simon Glassae7123f2015-01-05 20:05:27 -0700328 struct gpio_desc desc;
Simon Glass96495d92014-02-26 15:59:24 -0700329 int ret;
330
Simon Glassae7123f2015-01-05 20:05:27 -0700331 ret = gpio_to_device(gpio, &desc);
Simon Glass96495d92014-02-26 15:59:24 -0700332 if (ret)
333 return ret;
Simon Glassae7123f2015-01-05 20:05:27 -0700334 ret = check_reserved(&desc, "dir_output");
335 if (ret)
336 return ret;
Simon Glass96495d92014-02-26 15:59:24 -0700337
Simon Glassae7123f2015-01-05 20:05:27 -0700338 return gpio_get_ops(desc.dev)->direction_output(desc.dev,
339 desc.offset, value);
340}
341
Simon Glass17c43f12016-03-06 19:27:51 -0700342int dm_gpio_get_value(const struct gpio_desc *desc)
Simon Glassae7123f2015-01-05 20:05:27 -0700343{
344 int value;
345 int ret;
346
347 ret = check_reserved(desc, "get_value");
348 if (ret)
349 return ret;
350
351 value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset);
352
353 return desc->flags & GPIOD_ACTIVE_LOW ? !value : value;
354}
355
Simon Glass17c43f12016-03-06 19:27:51 -0700356int dm_gpio_set_value(const struct gpio_desc *desc, int value)
Simon Glassae7123f2015-01-05 20:05:27 -0700357{
358 int ret;
359
360 ret = check_reserved(desc, "set_value");
361 if (ret)
362 return ret;
363
364 if (desc->flags & GPIOD_ACTIVE_LOW)
365 value = !value;
366 gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value);
367 return 0;
368}
369
mario.six@gdsys.cc53ecdfb2016-05-25 15:15:21 +0200370int dm_gpio_get_open_drain(struct gpio_desc *desc)
371{
372 struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
373 int ret;
374
375 ret = check_reserved(desc, "get_open_drain");
376 if (ret)
377 return ret;
378
379 if (ops->set_open_drain)
380 return ops->get_open_drain(desc->dev, desc->offset);
381 else
382 return -ENOSYS;
383}
384
385int dm_gpio_set_open_drain(struct gpio_desc *desc, int value)
386{
387 struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
388 int ret;
389
390 ret = check_reserved(desc, "set_open_drain");
391 if (ret)
392 return ret;
393
394 if (ops->set_open_drain)
395 ret = ops->set_open_drain(desc->dev, desc->offset, value);
396 else
397 return 0; /* feature not supported -> ignore setting */
398
399 return ret;
400}
401
Simon Glassae7123f2015-01-05 20:05:27 -0700402int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
403{
404 struct udevice *dev = desc->dev;
405 struct dm_gpio_ops *ops = gpio_get_ops(dev);
406 int ret;
407
408 ret = check_reserved(desc, "set_dir");
409 if (ret)
410 return ret;
411
412 if (flags & GPIOD_IS_OUT) {
413 int value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0;
414
415 if (flags & GPIOD_ACTIVE_LOW)
416 value = !value;
417 ret = ops->direction_output(dev, desc->offset, value);
418 } else if (flags & GPIOD_IS_IN) {
419 ret = ops->direction_input(dev, desc->offset);
420 }
421 if (ret)
422 return ret;
423 /*
424 * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in
425 * futures
426 */
427 desc->flags = flags;
428
429 return 0;
430}
431
432int dm_gpio_set_dir(struct gpio_desc *desc)
433{
434 return dm_gpio_set_dir_flags(desc, desc->flags);
Simon Glass96495d92014-02-26 15:59:24 -0700435}
436
437/**
438 * gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value
439 * gpio: GPIO number
440 *
441 * This function implements the API that's compatible with current
442 * GPIO API used in U-Boot. The request is forwarded to particular
443 * GPIO driver. Returns the value of the GPIO pin, or negative value
444 * on error.
445 */
446int gpio_get_value(unsigned gpio)
447{
Simon Glass96495d92014-02-26 15:59:24 -0700448 int ret;
449
Simon Glassae7123f2015-01-05 20:05:27 -0700450 struct gpio_desc desc;
451
452 ret = gpio_to_device(gpio, &desc);
Simon Glass96495d92014-02-26 15:59:24 -0700453 if (ret)
454 return ret;
Simon Glassae7123f2015-01-05 20:05:27 -0700455 return dm_gpio_get_value(&desc);
Simon Glass96495d92014-02-26 15:59:24 -0700456}
457
458/**
459 * gpio_set_value() - [COMPAT] Configure logical value on GPIO pin
460 * gpio: GPIO number
461 * value: Logical value to be set on the GPIO pin.
462 *
463 * This function implements the API that's compatible with current
464 * GPIO API used in U-Boot. The request is forwarded to particular
465 * GPIO driver. Returns 0 on success, negative value on error.
466 */
467int gpio_set_value(unsigned gpio, int value)
468{
Simon Glassae7123f2015-01-05 20:05:27 -0700469 struct gpio_desc desc;
Simon Glass96495d92014-02-26 15:59:24 -0700470 int ret;
471
Simon Glassae7123f2015-01-05 20:05:27 -0700472 ret = gpio_to_device(gpio, &desc);
Simon Glass96495d92014-02-26 15:59:24 -0700473 if (ret)
474 return ret;
Simon Glassae7123f2015-01-05 20:05:27 -0700475 return dm_gpio_set_value(&desc, value);
Simon Glass96495d92014-02-26 15:59:24 -0700476}
477
Heiko Schocher54c5d082014-05-22 12:43:05 +0200478const char *gpio_get_bank_info(struct udevice *dev, int *bit_count)
Simon Glass96495d92014-02-26 15:59:24 -0700479{
480 struct gpio_dev_priv *priv;
481
482 /* Must be called on an active device */
Simon Glasse564f052015-03-05 12:25:20 -0700483 priv = dev_get_uclass_priv(dev);
Simon Glass96495d92014-02-26 15:59:24 -0700484 assert(priv);
485
486 *bit_count = priv->gpio_count;
487 return priv->bank_name;
488}
489
Simon Glass6449a502014-10-04 11:29:43 -0600490static const char * const gpio_function[GPIOF_COUNT] = {
491 "input",
492 "output",
493 "unused",
494 "unknown",
495 "func",
496};
497
498int get_function(struct udevice *dev, int offset, bool skip_unused,
499 const char **namep)
500{
Simon Glasse564f052015-03-05 12:25:20 -0700501 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
Simon Glass6449a502014-10-04 11:29:43 -0600502 struct dm_gpio_ops *ops = gpio_get_ops(dev);
503
504 BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
505 if (!device_active(dev))
506 return -ENODEV;
507 if (offset < 0 || offset >= uc_priv->gpio_count)
508 return -EINVAL;
509 if (namep)
510 *namep = uc_priv->name[offset];
511 if (skip_unused && !uc_priv->name[offset])
512 return GPIOF_UNUSED;
513 if (ops->get_function) {
514 int ret;
515
516 ret = ops->get_function(dev, offset);
517 if (ret < 0)
518 return ret;
519 if (ret >= ARRAY_SIZE(gpio_function))
520 return -ENODATA;
521 return ret;
522 }
523
524 return GPIOF_UNKNOWN;
525}
526
527int gpio_get_function(struct udevice *dev, int offset, const char **namep)
528{
529 return get_function(dev, offset, true, namep);
530}
531
532int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep)
533{
534 return get_function(dev, offset, false, namep);
535}
536
Simon Glass07575352014-10-04 11:29:44 -0600537int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
538{
539 struct dm_gpio_ops *ops = gpio_get_ops(dev);
540 struct gpio_dev_priv *priv;
541 char *str = buf;
542 int func;
543 int ret;
544 int len;
545
546 BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
547
548 *buf = 0;
Simon Glasse564f052015-03-05 12:25:20 -0700549 priv = dev_get_uclass_priv(dev);
Simon Glass07575352014-10-04 11:29:44 -0600550 ret = gpio_get_raw_function(dev, offset, NULL);
551 if (ret < 0)
552 return ret;
553 func = ret;
554 len = snprintf(str, buffsize, "%s%d: %s",
555 priv->bank_name ? priv->bank_name : "",
556 offset, gpio_function[func]);
557 if (func == GPIOF_INPUT || func == GPIOF_OUTPUT ||
558 func == GPIOF_UNUSED) {
559 const char *label;
560 bool used;
561
562 ret = ops->get_value(dev, offset);
563 if (ret < 0)
564 return ret;
565 used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED;
566 snprintf(str + len, buffsize - len, ": %d [%c]%s%s",
567 ret,
568 used ? 'x' : ' ',
569 used ? " " : "",
570 label ? label : "");
571 }
572
573 return 0;
574}
575
Simon Glass962f5ca2015-04-14 21:03:20 -0600576int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
577{
578 int i, ret;
579 int gpio;
580
581 for (i = 0; i < 32; i++) {
582 gpio = gpio_num_array[i];
583 if (gpio == -1)
584 break;
585 ret = gpio_requestf(gpio, fmt, i);
586 if (ret)
587 goto err;
588 ret = gpio_direction_input(gpio);
589 if (ret) {
590 gpio_free(gpio);
591 goto err;
592 }
593 }
594
595 return 0;
596err:
597 for (i--; i >= 0; i--)
598 gpio_free(gpio_num_array[i]);
599
600 return ret;
601}
602
Simon Glasse5901c92014-11-10 18:00:21 -0700603/*
604 * get a number comprised of multiple GPIO values. gpio_num_array points to
605 * the array of gpio pin numbers to scan, terminated by -1.
606 */
Simon Glass962f5ca2015-04-14 21:03:20 -0600607int gpio_get_values_as_int(const int *gpio_list)
Simon Glasse5901c92014-11-10 18:00:21 -0700608{
609 int gpio;
610 unsigned bitmask = 1;
611 unsigned vector = 0;
Simon Glass962f5ca2015-04-14 21:03:20 -0600612 int ret;
Simon Glasse5901c92014-11-10 18:00:21 -0700613
614 while (bitmask &&
Simon Glass962f5ca2015-04-14 21:03:20 -0600615 ((gpio = *gpio_list++) != -1)) {
616 ret = gpio_get_value(gpio);
617 if (ret < 0)
618 return ret;
619 else if (ret)
Simon Glasse5901c92014-11-10 18:00:21 -0700620 vector |= bitmask;
621 bitmask <<= 1;
622 }
Simon Glass962f5ca2015-04-14 21:03:20 -0600623
Simon Glasse5901c92014-11-10 18:00:21 -0700624 return vector;
625}
626
Simon Glass17c43f12016-03-06 19:27:51 -0700627int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count)
Simon Glassbbf24782016-03-06 19:27:50 -0700628{
629 unsigned bitmask = 1;
630 unsigned vector = 0;
631 int ret, i;
632
633 for (i = 0; i < count; i++) {
634 ret = dm_gpio_get_value(&desc_list[i]);
635 if (ret < 0)
636 return ret;
637 else if (ret)
638 vector |= bitmask;
639 bitmask <<= 1;
640 }
641
642 return vector;
643}
644
Simon Glass3669e0e2015-01-05 20:05:29 -0700645static int _gpio_request_by_name_nodev(const void *blob, int node,
646 const char *list_name, int index,
647 struct gpio_desc *desc, int flags,
648 bool add_index)
649{
650 struct fdtdec_phandle_args args;
651 int ret;
652
653 desc->dev = NULL;
654 desc->offset = 0;
Eric Nelson6c880b72016-04-24 16:32:40 -0700655 desc->flags = 0;
Simon Glass3669e0e2015-01-05 20:05:29 -0700656 ret = fdtdec_parse_phandle_with_args(blob, node, list_name,
657 "#gpio-cells", 0, index, &args);
658 if (ret) {
659 debug("%s: fdtdec_parse_phandle_with_args failed\n", __func__);
660 goto err;
661 }
662
663 ret = uclass_get_device_by_of_offset(UCLASS_GPIO, args.node,
664 &desc->dev);
665 if (ret) {
666 debug("%s: uclass_get_device_by_of_offset failed\n", __func__);
667 goto err;
668 }
669 ret = gpio_find_and_xlate(desc, &args);
670 if (ret) {
671 debug("%s: gpio_find_and_xlate failed\n", __func__);
672 goto err;
673 }
674 ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s",
675 fdt_get_name(blob, node, NULL),
676 list_name, index);
677 if (ret) {
678 debug("%s: dm_gpio_requestf failed\n", __func__);
679 goto err;
680 }
681 ret = dm_gpio_set_dir_flags(desc, flags | desc->flags);
682 if (ret) {
683 debug("%s: dm_gpio_set_dir failed\n", __func__);
684 goto err;
685 }
686
687 return 0;
688err:
689 debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n",
690 __func__, fdt_get_name(blob, node, NULL), list_name, index, ret);
691 return ret;
692}
693
694int gpio_request_by_name_nodev(const void *blob, int node,
695 const char *list_name, int index,
696 struct gpio_desc *desc, int flags)
697{
698 return _gpio_request_by_name_nodev(blob, node, list_name, index, desc,
699 flags, index > 0);
700}
701
702int gpio_request_by_name(struct udevice *dev, const char *list_name, int index,
703 struct gpio_desc *desc, int flags)
704{
705 /*
706 * This isn't ideal since we don't use dev->name in the debug()
707 * calls in gpio_request_by_name(), but we can do this until
708 * gpio_request_by_name_nodev() can be dropped.
709 */
Simon Glasse160f7d2017-01-17 16:52:55 -0700710 return gpio_request_by_name_nodev(gd->fdt_blob, dev_of_offset(dev),
Simon Glass3669e0e2015-01-05 20:05:29 -0700711 list_name, index, desc, flags);
712}
713
714int gpio_request_list_by_name_nodev(const void *blob, int node,
715 const char *list_name,
716 struct gpio_desc *desc, int max_count,
717 int flags)
718{
719 int count;
720 int ret;
721
Przemyslaw Marczak2984e7a2015-03-31 18:57:16 +0200722 for (count = 0; count < max_count; count++) {
Simon Glass3669e0e2015-01-05 20:05:29 -0700723 ret = _gpio_request_by_name_nodev(blob, node, list_name, count,
724 &desc[count], flags, true);
725 if (ret == -ENOENT)
726 break;
727 else if (ret)
728 goto err;
729 }
730
731 /* We ran out of GPIOs in the list */
732 return count;
733
734err:
735 gpio_free_list_nodev(desc, count - 1);
736
737 return ret;
738}
739
740int gpio_request_list_by_name(struct udevice *dev, const char *list_name,
741 struct gpio_desc *desc, int max_count,
742 int flags)
743{
744 /*
745 * This isn't ideal since we don't use dev->name in the debug()
746 * calls in gpio_request_by_name(), but we can do this until
747 * gpio_request_list_by_name_nodev() can be dropped.
748 */
Simon Glasse160f7d2017-01-17 16:52:55 -0700749 return gpio_request_list_by_name_nodev(gd->fdt_blob, dev_of_offset(dev),
Simon Glass3669e0e2015-01-05 20:05:29 -0700750 list_name, desc, max_count,
751 flags);
752}
753
754int gpio_get_list_count(struct udevice *dev, const char *list_name)
755{
756 int ret;
757
Simon Glasse160f7d2017-01-17 16:52:55 -0700758 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
Simon Glass3669e0e2015-01-05 20:05:29 -0700759 list_name, "#gpio-cells", 0, -1,
760 NULL);
761 if (ret) {
762 debug("%s: Node '%s', property '%s', GPIO count failed: %d\n",
763 __func__, dev->name, list_name, ret);
764 }
765
766 return ret;
767}
768
769int dm_gpio_free(struct udevice *dev, struct gpio_desc *desc)
770{
771 /* For now, we don't do any checking of dev */
772 return _dm_gpio_free(desc->dev, desc->offset);
773}
774
775int gpio_free_list(struct udevice *dev, struct gpio_desc *desc, int count)
776{
777 int i;
778
779 /* For now, we don't do any checking of dev */
780 for (i = 0; i < count; i++)
781 dm_gpio_free(dev, &desc[i]);
782
783 return 0;
784}
785
786int gpio_free_list_nodev(struct gpio_desc *desc, int count)
787{
788 return gpio_free_list(NULL, desc, count);
789}
790
Simon Glass96495d92014-02-26 15:59:24 -0700791/* We need to renumber the GPIOs when any driver is probed/removed */
Simon Glassb892d122014-10-04 11:29:42 -0600792static int gpio_renumber(struct udevice *removed_dev)
Simon Glass96495d92014-02-26 15:59:24 -0700793{
794 struct gpio_dev_priv *uc_priv;
Heiko Schocher54c5d082014-05-22 12:43:05 +0200795 struct udevice *dev;
Simon Glass96495d92014-02-26 15:59:24 -0700796 struct uclass *uc;
797 unsigned base;
798 int ret;
799
800 ret = uclass_get(UCLASS_GPIO, &uc);
801 if (ret)
802 return ret;
803
804 /* Ensure that we have a base for each bank */
805 base = 0;
806 uclass_foreach_dev(dev, uc) {
Simon Glassb892d122014-10-04 11:29:42 -0600807 if (device_active(dev) && dev != removed_dev) {
Simon Glasse564f052015-03-05 12:25:20 -0700808 uc_priv = dev_get_uclass_priv(dev);
Simon Glass96495d92014-02-26 15:59:24 -0700809 uc_priv->gpio_base = base;
810 base += uc_priv->gpio_count;
811 }
812 }
813
814 return 0;
815}
816
Simon Glass17c43f12016-03-06 19:27:51 -0700817int gpio_get_number(const struct gpio_desc *desc)
Simon Glass56a71f82015-03-25 12:21:58 -0600818{
819 struct udevice *dev = desc->dev;
820 struct gpio_dev_priv *uc_priv;
821
822 if (!dev)
823 return -1;
824 uc_priv = dev->uclass_priv;
825
826 return uc_priv->gpio_base + desc->offset;
827}
828
Heiko Schocher54c5d082014-05-22 12:43:05 +0200829static int gpio_post_probe(struct udevice *dev)
Simon Glass96495d92014-02-26 15:59:24 -0700830{
Simon Glasse564f052015-03-05 12:25:20 -0700831 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
Simon Glassb892d122014-10-04 11:29:42 -0600832
833 uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *));
834 if (!uc_priv->name)
835 return -ENOMEM;
836
837 return gpio_renumber(NULL);
Simon Glass96495d92014-02-26 15:59:24 -0700838}
839
Heiko Schocher54c5d082014-05-22 12:43:05 +0200840static int gpio_pre_remove(struct udevice *dev)
Simon Glass96495d92014-02-26 15:59:24 -0700841{
Simon Glasse564f052015-03-05 12:25:20 -0700842 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
Simon Glassb892d122014-10-04 11:29:42 -0600843 int i;
844
845 for (i = 0; i < uc_priv->gpio_count; i++) {
846 if (uc_priv->name[i])
847 free(uc_priv->name[i]);
848 }
849 free(uc_priv->name);
850
851 return gpio_renumber(dev);
Simon Glass96495d92014-02-26 15:59:24 -0700852}
853
854UCLASS_DRIVER(gpio) = {
855 .id = UCLASS_GPIO,
856 .name = "gpio",
Bhuvanchandra DVae89bb02015-06-01 18:37:15 +0530857 .flags = DM_UC_FLAG_SEQ_ALIAS,
Simon Glass96495d92014-02-26 15:59:24 -0700858 .post_probe = gpio_post_probe,
859 .pre_remove = gpio_pre_remove,
860 .per_device_auto_alloc_size = sizeof(struct gpio_dev_priv),
861};