blob: 55a0ebe830ac5b19d7986023bd83463a100737e2 [file] [log] [blame]
Linus Walleij394349f2011-11-24 18:27:15 +01001/*
2 * Core driver for the generic pin config portions of the pin control subsystem
3 *
4 * Copyright (C) 2011 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 *
7 * Author: Linus Walleij <linus.walleij@linaro.org>
8 *
9 * License terms: GNU General Public License (GPL) version 2
10 */
11
12#define pr_fmt(fmt) "generic pinconfig core: " fmt
13
14#include <linux/kernel.h>
Haojian Zhuang9cfd1722013-02-17 19:42:53 +080015#include <linux/module.h>
Linus Walleij394349f2011-11-24 18:27:15 +010016#include <linux/init.h>
17#include <linux/device.h>
18#include <linux/slab.h>
19#include <linux/debugfs.h>
20#include <linux/seq_file.h>
21#include <linux/pinctrl/pinctrl.h>
22#include <linux/pinctrl/pinconf.h>
23#include <linux/pinctrl/pinconf-generic.h>
Heiko Stübner7db9af42013-06-10 21:40:29 +020024#include <linux/of.h>
Linus Walleij394349f2011-11-24 18:27:15 +010025#include "core.h"
26#include "pinconf.h"
Laxman Dewangane81c8f12013-08-06 18:42:34 +053027#include "pinctrl-utils.h"
Linus Walleij394349f2011-11-24 18:27:15 +010028
29#ifdef CONFIG_DEBUG_FS
30
31struct pin_config_item {
32 const enum pin_config_param param;
33 const char * const display;
34 const char * const format;
35};
36
37#define PCONFDUMP(a, b, c) { .param = a, .display = b, .format = c }
38
Sachin Kamat1ef465c2013-03-15 10:23:15 +053039static struct pin_config_item conf_items[] = {
Linus Walleij394349f2011-11-24 18:27:15 +010040 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
41 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
James Hogana2df4262013-05-24 17:21:12 +010042 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL),
Linus Walleij394349f2011-11-24 18:27:15 +010043 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
44 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
Heiko Stübner7970cb72013-06-06 16:44:25 +020045 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
46 "input bias pull to pin specific state", NULL),
Linus Walleij394349f2011-11-24 18:27:15 +010047 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
48 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL),
49 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL),
James Hogan73ae3682013-05-24 17:21:11 +010050 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"),
Haojian Zhuangea27c392013-02-12 01:10:57 +080051 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL),
Linus Walleij394349f2011-11-24 18:27:15 +010052 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL),
Heiko Stübner256aeb62013-06-25 14:56:11 +020053 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"),
Linus Walleij394349f2011-11-24 18:27:15 +010054 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"),
Haojian Zhuang684697c2013-01-18 15:31:15 +080055 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL),
Linus Walleij394349f2011-11-24 18:27:15 +010056 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"),
Linus Walleij483f33f2013-01-04 17:57:40 +010057 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"),
Linus Walleij394349f2011-11-24 18:27:15 +010058};
59
60void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
61 struct seq_file *s, unsigned pin)
62{
63 const struct pinconf_ops *ops = pctldev->desc->confops;
64 int i;
65
66 if (!ops->is_generic)
67 return;
68
Sachin Kamatb6465422013-03-15 10:23:16 +053069 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
Linus Walleij394349f2011-11-24 18:27:15 +010070 unsigned long config;
71 int ret;
72
73 /* We want to check out this parameter */
74 config = pinconf_to_config_packed(conf_items[i].param, 0);
75 ret = pin_config_get_for_pin(pctldev, pin, &config);
76 /* These are legal errors */
77 if (ret == -EINVAL || ret == -ENOTSUPP)
78 continue;
79 if (ret) {
80 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
81 continue;
82 }
83 /* Space between multiple configs */
84 seq_puts(s, " ");
85 seq_puts(s, conf_items[i].display);
86 /* Print unit if available */
87 if (conf_items[i].format &&
88 pinconf_to_config_argument(config) != 0)
89 seq_printf(s, " (%u %s)",
90 pinconf_to_config_argument(config),
91 conf_items[i].format);
92 }
93}
94
95void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
96 struct seq_file *s, const char *gname)
97{
98 const struct pinconf_ops *ops = pctldev->desc->confops;
99 int i;
100
101 if (!ops->is_generic)
102 return;
103
Sachin Kamatb6465422013-03-15 10:23:16 +0530104 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
Linus Walleij394349f2011-11-24 18:27:15 +0100105 unsigned long config;
106 int ret;
107
108 /* We want to check out this parameter */
109 config = pinconf_to_config_packed(conf_items[i].param, 0);
110 ret = pin_config_group_get(dev_name(pctldev->dev), gname,
111 &config);
112 /* These are legal errors */
113 if (ret == -EINVAL || ret == -ENOTSUPP)
114 continue;
115 if (ret) {
116 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
117 continue;
118 }
119 /* Space between multiple configs */
120 seq_puts(s, " ");
121 seq_puts(s, conf_items[i].display);
122 /* Print unit if available */
123 if (conf_items[i].format && config != 0)
124 seq_printf(s, " (%u %s)",
125 pinconf_to_config_argument(config),
126 conf_items[i].format);
127 }
128}
129
Haojian Zhuang9cfd1722013-02-17 19:42:53 +0800130void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
131 struct seq_file *s, unsigned long config)
132{
133 int i;
134
Sachin Kamatb6465422013-03-15 10:23:16 +0530135 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
Haojian Zhuang9cfd1722013-02-17 19:42:53 +0800136 if (pinconf_to_config_param(config) != conf_items[i].param)
137 continue;
138 seq_printf(s, "%s: 0x%x", conf_items[i].display,
139 pinconf_to_config_argument(config));
140 }
141}
142EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
Linus Walleij394349f2011-11-24 18:27:15 +0100143#endif
Heiko Stübner7db9af42013-06-10 21:40:29 +0200144
145#ifdef CONFIG_OF
146struct pinconf_generic_dt_params {
147 const char * const property;
148 enum pin_config_param param;
149 u32 default_value;
150};
151
152static struct pinconf_generic_dt_params dt_params[] = {
153 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
154 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
155 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
Heiko Stübner9ee1f7d2013-06-14 17:42:49 +0200156 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
157 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
158 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
Heiko Stübner7db9af42013-06-10 21:40:29 +0200159 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
160 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
161 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
162 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
163 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
164 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
Heiko Stübner7db9af42013-06-10 21:40:29 +0200165 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
Heiko Stübner9ee1f7d2013-06-14 17:42:49 +0200166 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
167 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
Heiko Stübner7db9af42013-06-10 21:40:29 +0200168 { "output-low", PIN_CONFIG_OUTPUT, 0, },
169 { "output-high", PIN_CONFIG_OUTPUT, 1, },
170};
171
172/**
173 * pinconf_generic_parse_dt_config()
174 * parse the config properties into generic pinconfig values.
175 * @np: node containing the pinconfig properties
176 * @configs: array with nconfigs entries containing the generic pinconf values
177 * @nconfigs: umber of configurations
178 */
179int pinconf_generic_parse_dt_config(struct device_node *np,
180 unsigned long **configs,
181 unsigned int *nconfigs)
182{
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200183 unsigned long *cfg;
Heiko Stübner7db9af42013-06-10 21:40:29 +0200184 unsigned int ncfg = 0;
185 int ret;
186 int i;
187 u32 val;
188
189 if (!np)
190 return -EINVAL;
191
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200192 /* allocate a temporary array big enough to hold one of each option */
193 cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
194 if (!cfg)
195 return -ENOMEM;
196
Heiko Stübner7db9af42013-06-10 21:40:29 +0200197 for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
198 struct pinconf_generic_dt_params *par = &dt_params[i];
199 ret = of_property_read_u32(np, par->property, &val);
200
201 /* property not found */
202 if (ret == -EINVAL)
203 continue;
204
205 /* use default value, when no value is specified */
206 if (ret)
207 val = par->default_value;
208
209 pr_debug("found %s with value %u\n", par->property, val);
210 cfg[ncfg] = pinconf_to_config_packed(par->param, val);
211 ncfg++;
212 }
213
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200214 ret = 0;
215
Heiko Stübnere4a88442013-06-14 17:43:21 +0200216 /* no configs found at all */
217 if (ncfg == 0) {
218 *configs = NULL;
219 *nconfigs = 0;
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200220 goto out;
Heiko Stübnere4a88442013-06-14 17:43:21 +0200221 }
222
Heiko Stübner7db9af42013-06-10 21:40:29 +0200223 /*
224 * Now limit the number of configs to the real number of
225 * found properties.
226 */
227 *configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL);
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200228 if (!*configs) {
229 ret = -ENOMEM;
230 goto out;
231 }
Heiko Stübner7db9af42013-06-10 21:40:29 +0200232
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200233 memcpy(*configs, cfg, ncfg * sizeof(unsigned long));
Heiko Stübner7db9af42013-06-10 21:40:29 +0200234 *nconfigs = ncfg;
Heiko Stübner6abab2d2013-06-14 17:43:55 +0200235
236out:
237 kfree(cfg);
238 return ret;
Heiko Stübner7db9af42013-06-10 21:40:29 +0200239}
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530240
241int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
242 struct device_node *np, struct pinctrl_map **map,
Laxman Dewangan3287c242013-08-21 16:53:37 +0530243 unsigned *reserved_maps, unsigned *num_maps,
244 enum pinctrl_map_type type)
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530245{
246 int ret;
247 const char *function;
248 struct device *dev = pctldev->dev;
249 unsigned long *configs = NULL;
250 unsigned num_configs = 0;
251 unsigned reserve;
252 struct property *prop;
253 const char *group;
254
255 ret = of_property_read_string(np, "function", &function);
256 if (ret < 0) {
257 /* EINVAL=missing, which is fine since it's optional */
258 if (ret != -EINVAL)
Axel Linacf564a2013-08-29 10:05:06 +0800259 dev_err(dev, "could not parse property function\n");
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530260 function = NULL;
261 }
262
263 ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
264 if (ret < 0) {
265 dev_err(dev, "could not parse node property\n");
266 return ret;
267 }
268
269 reserve = 0;
270 if (function != NULL)
271 reserve++;
272 if (num_configs)
273 reserve++;
274 ret = of_property_count_strings(np, "pins");
275 if (ret < 0) {
Axel Linacf564a2013-08-29 10:05:06 +0800276 dev_err(dev, "could not parse property pins\n");
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530277 goto exit;
278 }
279 reserve *= ret;
280
281 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
282 num_maps, reserve);
283 if (ret < 0)
284 goto exit;
285
286 of_property_for_each_string(np, "pins", prop, group) {
287 if (function) {
288 ret = pinctrl_utils_add_map_mux(pctldev, map,
289 reserved_maps, num_maps, group,
290 function);
291 if (ret < 0)
292 goto exit;
293 }
294
295 if (num_configs) {
296 ret = pinctrl_utils_add_map_configs(pctldev, map,
297 reserved_maps, num_maps, group, configs,
Laxman Dewangan3287c242013-08-21 16:53:37 +0530298 num_configs, type);
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530299 if (ret < 0)
300 goto exit;
301 }
302 }
303 ret = 0;
304
305exit:
306 kfree(configs);
307 return ret;
308}
309EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
310
311int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
312 struct device_node *np_config, struct pinctrl_map **map,
Laxman Dewangan3287c242013-08-21 16:53:37 +0530313 unsigned *num_maps, enum pinctrl_map_type type)
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530314{
315 unsigned reserved_maps;
316 struct device_node *np;
317 int ret;
318
319 reserved_maps = 0;
320 *map = NULL;
321 *num_maps = 0;
322
323 for_each_child_of_node(np_config, np) {
324 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
Laxman Dewangan3287c242013-08-21 16:53:37 +0530325 &reserved_maps, num_maps, type);
Laxman Dewangane81c8f12013-08-06 18:42:34 +0530326 if (ret < 0) {
327 pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
328 return ret;
329 }
330 }
331 return 0;
332}
333EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
334
Heiko Stübner7db9af42013-06-10 21:40:29 +0200335#endif