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CommitLineData
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
2500bcc9 30static const struct pin_config_item conf_items[] = {
3c4b23dd 31 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
eec45071
SB
32 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
33 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
eec45071 34 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
7970cb77 35 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
eec45071 36 "input bias pull to pin specific state", NULL, false),
3c4b23dd 37 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
eec45071
SB
38 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
39 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
3c4b23dd 40 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
eec45071 41 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
3c4b23dd 42 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
eec45071 43 PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
eec45071 44 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
3c4b23dd 45 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
eec45071
SB
46 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
47 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
3c4b23dd
MY
48 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
49 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
394349f7
LW
50};
51
dd4d01f7
SB
52static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
53 struct seq_file *s, const char *gname,
54 unsigned pin,
55 const struct pin_config_item *items,
56 int nitems)
394349f7 57{
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LW
58 int i;
59
dd4d01f7 60 for (i = 0; i < nitems; i++) {
394349f7
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61 unsigned long config;
62 int ret;
63
64 /* We want to check out this parameter */
dd4d01f7
SB
65 config = pinconf_to_config_packed(items[i].param, 0);
66 if (gname)
67 ret = pin_config_group_get(dev_name(pctldev->dev),
68 gname, &config);
69 else
70 ret = pin_config_get_for_pin(pctldev, pin, &config);
394349f7
LW
71 /* These are legal errors */
72 if (ret == -EINVAL || ret == -ENOTSUPP)
73 continue;
74 if (ret) {
75 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
76 continue;
77 }
78 /* Space between multiple configs */
79 seq_puts(s, " ");
dd4d01f7 80 seq_puts(s, items[i].display);
394349f7 81 /* Print unit if available */
dd4d01f7 82 if (items[i].has_arg) {
eec45071
SB
83 seq_printf(s, " (%u",
84 pinconf_to_config_argument(config));
dd4d01f7
SB
85 if (items[i].format)
86 seq_printf(s, " %s)", items[i].format);
eec45071
SB
87 else
88 seq_puts(s, ")");
89 }
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LW
90 }
91}
92
dd4d01f7
SB
93/**
94 * pinconf_generic_dump_pins - Print information about pin or group of pins
95 * @pctldev: Pincontrol device
96 * @s: File to print to
97 * @gname: Group name specifying pins
98 * @pin: Pin number specyfying pin
99 *
100 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
101 * specified either by pin using @pin or by group using @gname. Only one needs
102 * to be specified the other can be NULL/0.
103 */
104void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
105 const char *gname, unsigned pin)
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LW
106{
107 const struct pinconf_ops *ops = pctldev->desc->confops;
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108
109 if (!ops->is_generic)
110 return;
111
dd4d01f7
SB
112 /* generic parameters */
113 pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
114 ARRAY_SIZE(conf_items));
115 /* driver-specific parameters */
f684e4ac
LW
116 if (pctldev->desc->num_custom_params &&
117 pctldev->desc->custom_conf_items)
dd4d01f7 118 pinconf_generic_dump_one(pctldev, s, gname, pin,
f684e4ac
LW
119 pctldev->desc->custom_conf_items,
120 pctldev->desc->num_custom_params);
394349f7
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121}
122
9cfd1724
HZ
123void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
124 struct seq_file *s, unsigned long config)
125{
126 int i;
127
b6465424 128 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
9cfd1724
HZ
129 if (pinconf_to_config_param(config) != conf_items[i].param)
130 continue;
131 seq_printf(s, "%s: 0x%x", conf_items[i].display,
132 pinconf_to_config_argument(config));
133 }
dd4d01f7 134
f684e4ac
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135 if (!pctldev->desc->num_custom_params ||
136 !pctldev->desc->custom_conf_items)
dd4d01f7
SB
137 return;
138
f684e4ac
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139 for (i = 0; i < pctldev->desc->num_custom_params; i++) {
140 if (pinconf_to_config_param(config) !=
141 pctldev->desc->custom_conf_items[i].param)
dd4d01f7 142 continue;
f684e4ac
LW
143 seq_printf(s, "%s: 0x%x",
144 pctldev->desc->custom_conf_items[i].display,
145 pinconf_to_config_argument(config));
dd4d01f7 146 }
9cfd1724
HZ
147}
148EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
394349f7 149#endif
7db9af4b
HS
150
151#ifdef CONFIG_OF
f684e4ac 152static const struct pinconf_generic_params dt_params[] = {
3c4b23dd 153 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
7db9af4b
HS
154 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
155 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
9ee1f7d2 156 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
9ee1f7d2 157 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
3c4b23dd 158 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
7db9af4b
HS
159 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
160 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
3c4b23dd 161 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
7db9af4b 162 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
3c4b23dd 163 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
8ba3f4d0 164 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
3c4b23dd 165 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
69c308e2 166 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
7db9af4b 167 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
3c4b23dd 168 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
9ee1f7d2 169 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
3c4b23dd 170 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
7db9af4b 171 { "output-high", PIN_CONFIG_OUTPUT, 1, },
3c4b23dd
MY
172 { "output-low", PIN_CONFIG_OUTPUT, 0, },
173 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
174 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
7db9af4b
HS
175};
176
dd4d01f7 177/**
f684e4ac 178 * parse_dt_cfg() - Parse DT pinconf parameters
dd4d01f7 179 * @np: DT node
f684e4ac 180 * @params: Array of describing generic parameters
dd4d01f7
SB
181 * @count: Number of entries in @params
182 * @cfg: Array of parsed config options
183 * @ncfg: Number of entries in @cfg
184 *
185 * Parse the config options described in @params from @np and puts the result
186 * in @cfg. @cfg does not need to be empty, entries are added beggining at
187 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
188 * needs to have enough memory allocated to hold all possible entries.
189 */
190static void parse_dt_cfg(struct device_node *np,
f684e4ac 191 const struct pinconf_generic_params *params,
dd4d01f7
SB
192 unsigned int count, unsigned long *cfg,
193 unsigned int *ncfg)
194{
195 int i;
196
197 for (i = 0; i < count; i++) {
198 u32 val;
199 int ret;
f684e4ac 200 const struct pinconf_generic_params *par = &params[i];
dd4d01f7
SB
201
202 ret = of_property_read_u32(np, par->property, &val);
203
204 /* property not found */
205 if (ret == -EINVAL)
206 continue;
207
208 /* use default value, when no value is specified */
209 if (ret)
210 val = par->default_value;
211
212 pr_debug("found %s with value %u\n", par->property, val);
213 cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
214 (*ncfg)++;
215 }
216}
217
7db9af4b
HS
218/**
219 * pinconf_generic_parse_dt_config()
220 * parse the config properties into generic pinconfig values.
221 * @np: node containing the pinconfig properties
222 * @configs: array with nconfigs entries containing the generic pinconf values
d9ac5e25 223 * must be freed when no longer necessary.
7db9af4b
HS
224 * @nconfigs: umber of configurations
225 */
226int pinconf_generic_parse_dt_config(struct device_node *np,
dd4d01f7 227 struct pinctrl_dev *pctldev,
7db9af4b
HS
228 unsigned long **configs,
229 unsigned int *nconfigs)
230{
6abab2d4 231 unsigned long *cfg;
dd4d01f7 232 unsigned int max_cfg, ncfg = 0;
7db9af4b 233 int ret;
7db9af4b
HS
234
235 if (!np)
236 return -EINVAL;
237
6abab2d4 238 /* allocate a temporary array big enough to hold one of each option */
dd4d01f7
SB
239 max_cfg = ARRAY_SIZE(dt_params);
240 if (pctldev)
f684e4ac 241 max_cfg += pctldev->desc->num_custom_params;
dd4d01f7 242 cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
6abab2d4
HS
243 if (!cfg)
244 return -ENOMEM;
245
dd4d01f7 246 parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
f684e4ac
LW
247 if (pctldev && pctldev->desc->num_custom_params &&
248 pctldev->desc->custom_params)
249 parse_dt_cfg(np, pctldev->desc->custom_params,
250 pctldev->desc->num_custom_params, cfg, &ncfg);
7db9af4b 251
6abab2d4
HS
252 ret = 0;
253
e4a8844c
HS
254 /* no configs found at all */
255 if (ncfg == 0) {
256 *configs = NULL;
257 *nconfigs = 0;
6abab2d4 258 goto out;
e4a8844c
HS
259 }
260
7db9af4b
HS
261 /*
262 * Now limit the number of configs to the real number of
263 * found properties.
264 */
db388dfb 265 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
6abab2d4
HS
266 if (!*configs) {
267 ret = -ENOMEM;
268 goto out;
269 }
7db9af4b 270
7db9af4b 271 *nconfigs = ncfg;
6abab2d4
HS
272
273out:
274 kfree(cfg);
275 return ret;
7db9af4b 276}
e81c8f18
LD
277
278int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
279 struct device_node *np, struct pinctrl_map **map,
3287c240
LD
280 unsigned *reserved_maps, unsigned *num_maps,
281 enum pinctrl_map_type type)
e81c8f18
LD
282{
283 int ret;
284 const char *function;
285 struct device *dev = pctldev->dev;
286 unsigned long *configs = NULL;
287 unsigned num_configs = 0;
c7289500 288 unsigned reserve, strings_count;
e81c8f18
LD
289 struct property *prop;
290 const char *group;
31c89c95 291 const char *subnode_target_type = "pins";
e81c8f18 292
c7289500
BS
293 ret = of_property_count_strings(np, "pins");
294 if (ret < 0) {
295 ret = of_property_count_strings(np, "groups");
296 if (ret < 0)
297 /* skip this node; may contain config child nodes */
298 return 0;
299 if (type == PIN_MAP_TYPE_INVALID)
300 type = PIN_MAP_TYPE_CONFIGS_GROUP;
301 subnode_target_type = "groups";
302 } else {
303 if (type == PIN_MAP_TYPE_INVALID)
304 type = PIN_MAP_TYPE_CONFIGS_PIN;
305 }
306 strings_count = ret;
307
e81c8f18
LD
308 ret = of_property_read_string(np, "function", &function);
309 if (ret < 0) {
310 /* EINVAL=missing, which is fine since it's optional */
311 if (ret != -EINVAL)
4024efb4
BS
312 dev_err(dev, "%s: could not parse property function\n",
313 of_node_full_name(np));
e81c8f18
LD
314 function = NULL;
315 }
316
dd4d01f7
SB
317 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
318 &num_configs);
e81c8f18 319 if (ret < 0) {
4024efb4
BS
320 dev_err(dev, "%s: could not parse node property\n",
321 of_node_full_name(np));
e81c8f18
LD
322 return ret;
323 }
324
325 reserve = 0;
326 if (function != NULL)
327 reserve++;
328 if (num_configs)
329 reserve++;
31c89c95 330
c7289500 331 reserve *= strings_count;
e81c8f18
LD
332
333 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
334 num_maps, reserve);
335 if (ret < 0)
336 goto exit;
337
31c89c95 338 of_property_for_each_string(np, subnode_target_type, prop, group) {
e81c8f18
LD
339 if (function) {
340 ret = pinctrl_utils_add_map_mux(pctldev, map,
341 reserved_maps, num_maps, group,
342 function);
343 if (ret < 0)
344 goto exit;
345 }
346
347 if (num_configs) {
348 ret = pinctrl_utils_add_map_configs(pctldev, map,
349 reserved_maps, num_maps, group, configs,
3287c240 350 num_configs, type);
e81c8f18
LD
351 if (ret < 0)
352 goto exit;
353 }
354 }
355 ret = 0;
356
357exit:
358 kfree(configs);
359 return ret;
360}
361EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
362
363int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
364 struct device_node *np_config, struct pinctrl_map **map,
3287c240 365 unsigned *num_maps, enum pinctrl_map_type type)
e81c8f18
LD
366{
367 unsigned reserved_maps;
368 struct device_node *np;
369 int ret;
370
371 reserved_maps = 0;
372 *map = NULL;
373 *num_maps = 0;
374
c7289500
BS
375 ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
376 &reserved_maps, num_maps, type);
377 if (ret < 0)
378 goto exit;
379
e81c8f18
LD
380 for_each_child_of_node(np_config, np) {
381 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
3287c240 382 &reserved_maps, num_maps, type);
c7289500
BS
383 if (ret < 0)
384 goto exit;
e81c8f18
LD
385 }
386 return 0;
c7289500
BS
387
388exit:
389 pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
390 return ret;
e81c8f18
LD
391}
392EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
393
7db9af4b 394#endif