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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"), |
ea27c396 | 51 | PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL), |
394349f7 | 52 | PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL), |
256aeb64 | 53 | PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec"), |
394349f7 | 54 | PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector"), |
684697cb | 55 | PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL), |
394349f7 | 56 | PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode"), |
483f33f6 | 57 | PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level"), |
394349f7 LW |
58 | }; |
59 | ||
60 | void 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 | ||
b6465424 | 69 | for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
394349f7 LW |
70 | 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 | ||
95 | void 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 | ||
b6465424 | 104 | for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
394349f7 LW |
105 | 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 | ||
9cfd1724 HZ |
130 | void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, |
131 | struct seq_file *s, unsigned long config) | |
132 | { | |
133 | int i; | |
134 | ||
b6465424 | 135 | for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
9cfd1724 HZ |
136 | 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 | } | |
142 | EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); | |
394349f7 | 143 | #endif |
7db9af4b HS |
144 | |
145 | #ifdef CONFIG_OF | |
146 | struct pinconf_generic_dt_params { | |
147 | const char * const property; | |
148 | enum pin_config_param param; | |
149 | u32 default_value; | |
150 | }; | |
151 | ||
152 | static 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 }, | |
9ee1f7d2 HS |
156 | { "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 }, | |
7db9af4b HS |
159 | { "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 }, | |
7db9af4b | 165 | { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, |
9ee1f7d2 HS |
166 | { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 }, |
167 | { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 }, | |
7db9af4b HS |
168 | { "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 | */ | |
179 | int pinconf_generic_parse_dt_config(struct device_node *np, | |
180 | unsigned long **configs, | |
181 | unsigned int *nconfigs) | |
182 | { | |
6abab2d4 | 183 | unsigned long *cfg; |
7db9af4b HS |
184 | unsigned int ncfg = 0; |
185 | int ret; | |
186 | int i; | |
187 | u32 val; | |
188 | ||
189 | if (!np) | |
190 | return -EINVAL; | |
191 | ||
6abab2d4 HS |
192 | /* 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 | ||
7db9af4b HS |
197 | 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 | ||
6abab2d4 HS |
214 | ret = 0; |
215 | ||
e4a8844c HS |
216 | /* no configs found at all */ |
217 | if (ncfg == 0) { | |
218 | *configs = NULL; | |
219 | *nconfigs = 0; | |
6abab2d4 | 220 | goto out; |
e4a8844c HS |
221 | } |
222 | ||
7db9af4b HS |
223 | /* |
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); | |
6abab2d4 HS |
228 | if (!*configs) { |
229 | ret = -ENOMEM; | |
230 | goto out; | |
231 | } | |
7db9af4b | 232 | |
6abab2d4 | 233 | memcpy(*configs, cfg, ncfg * sizeof(unsigned long)); |
7db9af4b | 234 | *nconfigs = ncfg; |
6abab2d4 HS |
235 | |
236 | out: | |
237 | kfree(cfg); | |
238 | return ret; | |
7db9af4b | 239 | } |
e81c8f18 LD |
240 | |
241 | int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev, | |
242 | struct device_node *np, struct pinctrl_map **map, | |
3287c240 LD |
243 | unsigned *reserved_maps, unsigned *num_maps, |
244 | enum pinctrl_map_type type) | |
e81c8f18 LD |
245 | { |
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) | |
acf564a8 | 259 | dev_err(dev, "could not parse property function\n"); |
e81c8f18 LD |
260 | 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) { | |
acf564a8 | 276 | dev_err(dev, "could not parse property pins\n"); |
e81c8f18 LD |
277 | 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, | |
3287c240 | 298 | num_configs, type); |
e81c8f18 LD |
299 | if (ret < 0) |
300 | goto exit; | |
301 | } | |
302 | } | |
303 | ret = 0; | |
304 | ||
305 | exit: | |
306 | kfree(configs); | |
307 | return ret; | |
308 | } | |
309 | EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map); | |
310 | ||
311 | int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev, | |
312 | struct device_node *np_config, struct pinctrl_map **map, | |
3287c240 | 313 | unsigned *num_maps, enum pinctrl_map_type type) |
e81c8f18 LD |
314 | { |
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, | |
3287c240 | 325 | &reserved_maps, num_maps, type); |
e81c8f18 LD |
326 | if (ret < 0) { |
327 | pinctrl_utils_dt_free_map(pctldev, *map, *num_maps); | |
328 | return ret; | |
329 | } | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map); | |
334 | ||
7db9af4b | 335 | #endif |