Commit | Line | Data |
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394349f7 LW |
1 | /* |
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> | |
9cfd1724 | 15 | #include <linux/module.h> |
394349f7 LW |
16 | #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> | |
7db9af4b | 24 | #include <linux/of.h> |
394349f7 LW |
25 | #include "core.h" |
26 | #include "pinconf.h" | |
e81c8f18 | 27 | #include "pinctrl-utils.h" |
394349f7 LW |
28 | |
29 | #ifdef CONFIG_DEBUG_FS | |
30 | ||
31 | struct 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 | ||
1ef465c0 | 39 | static struct pin_config_item conf_items[] = { |
394349f7 LW |
40 | PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL), |
41 | PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL), | |
a2df4269 | 42 | PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL), |
394349f7 LW |
43 | PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL), |
44 | PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL), | |
7970cb77 HS |
45 | PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, |
46 | "input bias pull to pin specific state", NULL), | |
394349f7 LW |
47 | 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), | |
73ae368c | 50 | PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA"), |
8ba3f4d0 | 51 | PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL), |
ea27c396 | 52 | PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL), |
394349f7 | 53 | PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL), |
256aeb64 | 54 | PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"), |
394349f7 | 55 | PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"), |
684697cb | 56 | PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL), |
394349f7 | 57 | PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"), |
483f33f6 | 58 | PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"), |
394349f7 LW |
59 | }; |
60 | ||
61 | void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev, | |
62 | struct seq_file *s, unsigned pin) | |
63 | { | |
64 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
65 | int i; | |
66 | ||
67 | if (!ops->is_generic) | |
68 | return; | |
69 | ||
b6465424 | 70 | for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
394349f7 LW |
71 | unsigned long config; |
72 | int ret; | |
73 | ||
74 | /* We want to check out this parameter */ | |
75 | config = pinconf_to_config_packed(conf_items[i].param, 0); | |
76 | ret = pin_config_get_for_pin(pctldev, pin, &config); | |
77 | /* These are legal errors */ | |
78 | if (ret == -EINVAL || ret == -ENOTSUPP) | |
79 | continue; | |
80 | if (ret) { | |
81 | seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); | |
82 | continue; | |
83 | } | |
84 | /* Space between multiple configs */ | |
85 | seq_puts(s, " "); | |
86 | seq_puts(s, conf_items[i].display); | |
87 | /* Print unit if available */ | |
88 | if (conf_items[i].format && | |
89 | pinconf_to_config_argument(config) != 0) | |
90 | seq_printf(s, " (%u %s)", | |
91 | pinconf_to_config_argument(config), | |
92 | conf_items[i].format); | |
93 | } | |
94 | } | |
95 | ||
96 | void pinconf_generic_dump_group(struct pinctrl_dev *pctldev, | |
97 | struct seq_file *s, const char *gname) | |
98 | { | |
99 | const struct pinconf_ops *ops = pctldev->desc->confops; | |
100 | int i; | |
101 | ||
102 | if (!ops->is_generic) | |
103 | return; | |
104 | ||
b6465424 | 105 | for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
394349f7 LW |
106 | unsigned long config; |
107 | int ret; | |
108 | ||
109 | /* We want to check out this parameter */ | |
110 | config = pinconf_to_config_packed(conf_items[i].param, 0); | |
111 | ret = pin_config_group_get(dev_name(pctldev->dev), gname, | |
112 | &config); | |
113 | /* These are legal errors */ | |
114 | if (ret == -EINVAL || ret == -ENOTSUPP) | |
115 | continue; | |
116 | if (ret) { | |
117 | seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); | |
118 | continue; | |
119 | } | |
120 | /* Space between multiple configs */ | |
121 | seq_puts(s, " "); | |
122 | seq_puts(s, conf_items[i].display); | |
123 | /* Print unit if available */ | |
124 | if (conf_items[i].format && config != 0) | |
125 | seq_printf(s, " (%u %s)", | |
126 | pinconf_to_config_argument(config), | |
127 | conf_items[i].format); | |
128 | } | |
129 | } | |
130 | ||
9cfd1724 HZ |
131 | void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, |
132 | struct seq_file *s, unsigned long config) | |
133 | { | |
134 | int i; | |
135 | ||
b6465424 | 136 | for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
9cfd1724 HZ |
137 | if (pinconf_to_config_param(config) != conf_items[i].param) |
138 | continue; | |
139 | seq_printf(s, "%s: 0x%x", conf_items[i].display, | |
140 | pinconf_to_config_argument(config)); | |
141 | } | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); | |
394349f7 | 144 | #endif |
7db9af4b HS |
145 | |
146 | #ifdef CONFIG_OF | |
147 | struct pinconf_generic_dt_params { | |
148 | const char * const property; | |
149 | enum pin_config_param param; | |
150 | u32 default_value; | |
151 | }; | |
152 | ||
153 | static struct pinconf_generic_dt_params dt_params[] = { | |
154 | { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, | |
155 | { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 }, | |
156 | { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 }, | |
9ee1f7d2 HS |
157 | { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, |
158 | { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, | |
159 | { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, | |
7db9af4b HS |
160 | { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 }, |
161 | { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 }, | |
162 | { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 }, | |
163 | { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, | |
8ba3f4d0 SY |
164 | { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, |
165 | { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, | |
7db9af4b HS |
166 | { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, |
167 | { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, | |
7db9af4b | 168 | { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, |
9ee1f7d2 HS |
169 | { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 }, |
170 | { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 }, | |
7db9af4b HS |
171 | { "output-low", PIN_CONFIG_OUTPUT, 0, }, |
172 | { "output-high", PIN_CONFIG_OUTPUT, 1, }, | |
8ba3f4d0 | 173 | { "slew-rate", PIN_CONFIG_SLEW_RATE, 0}, |
7db9af4b HS |
174 | }; |
175 | ||
176 | /** | |
177 | * pinconf_generic_parse_dt_config() | |
178 | * parse the config properties into generic pinconfig values. | |
179 | * @np: node containing the pinconfig properties | |
180 | * @configs: array with nconfigs entries containing the generic pinconf values | |
181 | * @nconfigs: umber of configurations | |
182 | */ | |
183 | int pinconf_generic_parse_dt_config(struct device_node *np, | |
184 | unsigned long **configs, | |
185 | unsigned int *nconfigs) | |
186 | { | |
6abab2d4 | 187 | unsigned long *cfg; |
7db9af4b HS |
188 | unsigned int ncfg = 0; |
189 | int ret; | |
190 | int i; | |
191 | u32 val; | |
192 | ||
193 | if (!np) | |
194 | return -EINVAL; | |
195 | ||
6abab2d4 HS |
196 | /* allocate a temporary array big enough to hold one of each option */ |
197 | cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL); | |
198 | if (!cfg) | |
199 | return -ENOMEM; | |
200 | ||
7db9af4b HS |
201 | for (i = 0; i < ARRAY_SIZE(dt_params); i++) { |
202 | struct pinconf_generic_dt_params *par = &dt_params[i]; | |
203 | ret = of_property_read_u32(np, par->property, &val); | |
204 | ||
205 | /* property not found */ | |
206 | if (ret == -EINVAL) | |
207 | continue; | |
208 | ||
209 | /* use default value, when no value is specified */ | |
210 | if (ret) | |
211 | val = par->default_value; | |
212 | ||
213 | pr_debug("found %s with value %u\n", par->property, val); | |
214 | cfg[ncfg] = pinconf_to_config_packed(par->param, val); | |
215 | ncfg++; | |
216 | } | |
217 | ||
6abab2d4 HS |
218 | ret = 0; |
219 | ||
e4a8844c HS |
220 | /* no configs found at all */ |
221 | if (ncfg == 0) { | |
222 | *configs = NULL; | |
223 | *nconfigs = 0; | |
6abab2d4 | 224 | goto out; |
e4a8844c HS |
225 | } |
226 | ||
7db9af4b HS |
227 | /* |
228 | * Now limit the number of configs to the real number of | |
229 | * found properties. | |
230 | */ | |
231 | *configs = kzalloc(ncfg * sizeof(unsigned long), GFP_KERNEL); | |
6abab2d4 HS |
232 | if (!*configs) { |
233 | ret = -ENOMEM; | |
234 | goto out; | |
235 | } | |
7db9af4b | 236 | |
6abab2d4 | 237 | memcpy(*configs, cfg, ncfg * sizeof(unsigned long)); |
7db9af4b | 238 | *nconfigs = ncfg; |
6abab2d4 HS |
239 | |
240 | out: | |
241 | kfree(cfg); | |
242 | return ret; | |
7db9af4b | 243 | } |
e81c8f18 LD |
244 | |
245 | int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev, | |
246 | struct device_node *np, struct pinctrl_map **map, | |
3287c240 LD |
247 | unsigned *reserved_maps, unsigned *num_maps, |
248 | enum pinctrl_map_type type) | |
e81c8f18 LD |
249 | { |
250 | int ret; | |
251 | const char *function; | |
252 | struct device *dev = pctldev->dev; | |
253 | unsigned long *configs = NULL; | |
254 | unsigned num_configs = 0; | |
255 | unsigned reserve; | |
256 | struct property *prop; | |
257 | const char *group; | |
258 | ||
259 | ret = of_property_read_string(np, "function", &function); | |
260 | if (ret < 0) { | |
261 | /* EINVAL=missing, which is fine since it's optional */ | |
262 | if (ret != -EINVAL) | |
acf564a8 | 263 | dev_err(dev, "could not parse property function\n"); |
e81c8f18 LD |
264 | function = NULL; |
265 | } | |
266 | ||
267 | ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs); | |
268 | if (ret < 0) { | |
269 | dev_err(dev, "could not parse node property\n"); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | reserve = 0; | |
274 | if (function != NULL) | |
275 | reserve++; | |
276 | if (num_configs) | |
277 | reserve++; | |
278 | ret = of_property_count_strings(np, "pins"); | |
279 | if (ret < 0) { | |
acf564a8 | 280 | dev_err(dev, "could not parse property pins\n"); |
e81c8f18 LD |
281 | goto exit; |
282 | } | |
283 | reserve *= ret; | |
284 | ||
285 | ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, | |
286 | num_maps, reserve); | |
287 | if (ret < 0) | |
288 | goto exit; | |
289 | ||
290 | of_property_for_each_string(np, "pins", prop, group) { | |
291 | if (function) { | |
292 | ret = pinctrl_utils_add_map_mux(pctldev, map, | |
293 | reserved_maps, num_maps, group, | |
294 | function); | |
295 | if (ret < 0) | |
296 | goto exit; | |
297 | } | |
298 | ||
299 | if (num_configs) { | |
300 | ret = pinctrl_utils_add_map_configs(pctldev, map, | |
301 | reserved_maps, num_maps, group, configs, | |
3287c240 | 302 | num_configs, type); |
e81c8f18 LD |
303 | if (ret < 0) |
304 | goto exit; | |
305 | } | |
306 | } | |
307 | ret = 0; | |
308 | ||
309 | exit: | |
310 | kfree(configs); | |
311 | return ret; | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map); | |
314 | ||
315 | int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev, | |
316 | struct device_node *np_config, struct pinctrl_map **map, | |
3287c240 | 317 | unsigned *num_maps, enum pinctrl_map_type type) |
e81c8f18 LD |
318 | { |
319 | unsigned reserved_maps; | |
320 | struct device_node *np; | |
321 | int ret; | |
322 | ||
323 | reserved_maps = 0; | |
324 | *map = NULL; | |
325 | *num_maps = 0; | |
326 | ||
327 | for_each_child_of_node(np_config, np) { | |
328 | ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map, | |
3287c240 | 329 | &reserved_maps, num_maps, type); |
e81c8f18 LD |
330 | if (ret < 0) { |
331 | pinctrl_utils_dt_free_map(pctldev, *map, *num_maps); | |
332 | return ret; | |
333 | } | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map); | |
338 | ||
7db9af4b | 339 | #endif |