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Thomas Abraham30574f02012-09-07 06:07:19 +09001/*
2 * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
6 * Copyright (c) 2012 Linaro Ltd
7 * http://www.linaro.org
8 *
9 * Author: Thomas Abraham <thomas.ab@samsung.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This driver implements the Samsung pinctrl driver. It supports setting up of
17 * pinmux and pinconf configurations. The gpiolib interface is also included.
18 * External interrupt (gpio and wakeup) support are not included in this driver
19 * but provides extensions to which platform specific implementation of the gpio
20 * and wakeup interrupts can be hooked to.
21 */
22
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/io.h>
26#include <linux/slab.h>
27#include <linux/err.h>
28#include <linux/gpio.h>
Tomasz Figaa19fe2d2012-10-11 10:11:20 +020029#include <linux/irqdomain.h>
Tomasz Figa19846952013-03-18 22:31:50 +010030#include <linux/spinlock.h>
Thomas Abraham30574f02012-09-07 06:07:19 +090031
32#include "core.h"
33#include "pinctrl-samsung.h"
34
35#define GROUP_SUFFIX "-grp"
36#define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
37#define FUNCTION_SUFFIX "-mux"
38#define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
39
40/* list of all possible config options supported */
Axel Lind5fd5da2012-12-10 09:54:03 +090041static struct pin_config {
Thomas Abraham30574f02012-09-07 06:07:19 +090042 char *prop_cfg;
43 unsigned int cfg_type;
44} pcfgs[] = {
45 { "samsung,pin-pud", PINCFG_TYPE_PUD },
46 { "samsung,pin-drv", PINCFG_TYPE_DRV },
47 { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
48 { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
49};
50
Sachin Kamat6fb6f1ba2012-11-24 11:20:51 +090051static unsigned int pin_base;
Tomasz Figa40ba6222012-10-11 10:11:09 +020052
Tomasz Figad3a7b9e2012-10-11 10:11:17 +020053static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
54{
55 return container_of(gc, struct samsung_pin_bank, gpio_chip);
56}
57
Thomas Abraham30574f02012-09-07 06:07:19 +090058/* check if the selector is a valid pin group selector */
59static int samsung_get_group_count(struct pinctrl_dev *pctldev)
60{
61 struct samsung_pinctrl_drv_data *drvdata;
62
63 drvdata = pinctrl_dev_get_drvdata(pctldev);
64 return drvdata->nr_groups;
65}
66
67/* return the name of the group selected by the group selector */
68static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
69 unsigned selector)
70{
71 struct samsung_pinctrl_drv_data *drvdata;
72
73 drvdata = pinctrl_dev_get_drvdata(pctldev);
74 return drvdata->pin_groups[selector].name;
75}
76
77/* return the pin numbers associated with the specified group */
78static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
79 unsigned selector, const unsigned **pins, unsigned *num_pins)
80{
81 struct samsung_pinctrl_drv_data *drvdata;
82
83 drvdata = pinctrl_dev_get_drvdata(pctldev);
84 *pins = drvdata->pin_groups[selector].pins;
85 *num_pins = drvdata->pin_groups[selector].num_pins;
86 return 0;
87}
88
89/* create pinctrl_map entries by parsing device tree nodes */
90static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
91 struct device_node *np, struct pinctrl_map **maps,
92 unsigned *nmaps)
93{
94 struct device *dev = pctldev->dev;
95 struct pinctrl_map *map;
96 unsigned long *cfg = NULL;
97 char *gname, *fname;
98 int cfg_cnt = 0, map_cnt = 0, idx = 0;
99
100 /* count the number of config options specfied in the node */
101 for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
102 if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
103 cfg_cnt++;
104 }
105
106 /*
107 * Find out the number of map entries to create. All the config options
108 * can be accomadated into a single config map entry.
109 */
110 if (cfg_cnt)
111 map_cnt = 1;
112 if (of_find_property(np, "samsung,pin-function", NULL))
113 map_cnt++;
114 if (!map_cnt) {
115 dev_err(dev, "node %s does not have either config or function "
116 "configurations\n", np->name);
117 return -EINVAL;
118 }
119
120 /* Allocate memory for pin-map entries */
121 map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
122 if (!map) {
123 dev_err(dev, "could not alloc memory for pin-maps\n");
124 return -ENOMEM;
125 }
126 *nmaps = 0;
127
128 /*
129 * Allocate memory for pin group name. The pin group name is derived
130 * from the node name from which these map entries are be created.
131 */
132 gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
133 if (!gname) {
134 dev_err(dev, "failed to alloc memory for group name\n");
135 goto free_map;
136 }
137 sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
138
139 /*
140 * don't have config options? then skip over to creating function
141 * map entries.
142 */
143 if (!cfg_cnt)
144 goto skip_cfgs;
145
146 /* Allocate memory for config entries */
147 cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
148 if (!cfg) {
149 dev_err(dev, "failed to alloc memory for configs\n");
150 goto free_gname;
151 }
152
153 /* Prepare a list of config settings */
154 for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
155 u32 value;
156 if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
157 cfg[cfg_cnt++] =
158 PINCFG_PACK(pcfgs[idx].cfg_type, value);
159 }
160
161 /* create the config map entry */
162 map[*nmaps].data.configs.group_or_pin = gname;
163 map[*nmaps].data.configs.configs = cfg;
164 map[*nmaps].data.configs.num_configs = cfg_cnt;
165 map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
166 *nmaps += 1;
167
168skip_cfgs:
169 /* create the function map entry */
170 if (of_find_property(np, "samsung,pin-function", NULL)) {
171 fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
172 if (!fname) {
173 dev_err(dev, "failed to alloc memory for func name\n");
174 goto free_cfg;
175 }
176 sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
177
178 map[*nmaps].data.mux.group = gname;
179 map[*nmaps].data.mux.function = fname;
180 map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
181 *nmaps += 1;
182 }
183
184 *maps = map;
185 return 0;
186
187free_cfg:
188 kfree(cfg);
189free_gname:
190 kfree(gname);
191free_map:
192 kfree(map);
193 return -ENOMEM;
194}
195
196/* free the memory allocated to hold the pin-map table */
197static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
198 struct pinctrl_map *map, unsigned num_maps)
199{
200 int idx;
201
202 for (idx = 0; idx < num_maps; idx++) {
203 if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
204 kfree(map[idx].data.mux.function);
205 if (!idx)
206 kfree(map[idx].data.mux.group);
207 } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
208 kfree(map[idx].data.configs.configs);
209 if (!idx)
210 kfree(map[idx].data.configs.group_or_pin);
211 }
212 };
213
214 kfree(map);
215}
216
217/* list of pinctrl callbacks for the pinctrl core */
Laurent Pinchart022ab142013-02-16 10:25:07 +0100218static const struct pinctrl_ops samsung_pctrl_ops = {
Thomas Abraham30574f02012-09-07 06:07:19 +0900219 .get_groups_count = samsung_get_group_count,
220 .get_group_name = samsung_get_group_name,
221 .get_group_pins = samsung_get_group_pins,
222 .dt_node_to_map = samsung_dt_node_to_map,
223 .dt_free_map = samsung_dt_free_map,
224};
225
226/* check if the selector is a valid pin function selector */
227static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
228{
229 struct samsung_pinctrl_drv_data *drvdata;
230
231 drvdata = pinctrl_dev_get_drvdata(pctldev);
232 return drvdata->nr_functions;
233}
234
235/* return the name of the pin function specified */
236static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
237 unsigned selector)
238{
239 struct samsung_pinctrl_drv_data *drvdata;
240
241 drvdata = pinctrl_dev_get_drvdata(pctldev);
242 return drvdata->pmx_functions[selector].name;
243}
244
245/* return the groups associated for the specified function selector */
246static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
247 unsigned selector, const char * const **groups,
248 unsigned * const num_groups)
249{
250 struct samsung_pinctrl_drv_data *drvdata;
251
252 drvdata = pinctrl_dev_get_drvdata(pctldev);
253 *groups = drvdata->pmx_functions[selector].groups;
254 *num_groups = drvdata->pmx_functions[selector].num_groups;
255 return 0;
256}
257
258/*
259 * given a pin number that is local to a pin controller, find out the pin bank
260 * and the register base of the pin bank.
261 */
Tomasz Figa62f14c02012-10-11 10:11:08 +0200262static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
263 unsigned pin, void __iomem **reg, u32 *offset,
Thomas Abraham30574f02012-09-07 06:07:19 +0900264 struct samsung_pin_bank **bank)
265{
Thomas Abraham30574f02012-09-07 06:07:19 +0900266 struct samsung_pin_bank *b;
267
Thomas Abraham30574f02012-09-07 06:07:19 +0900268 b = drvdata->ctrl->pin_banks;
269
270 while ((pin >= b->pin_base) &&
271 ((b->pin_base + b->nr_pins - 1) < pin))
272 b++;
273
274 *reg = drvdata->virt_base + b->pctl_offset;
275 *offset = pin - b->pin_base;
276 if (bank)
277 *bank = b;
Thomas Abraham30574f02012-09-07 06:07:19 +0900278}
279
280/* enable or disable a pinmux function */
281static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
282 unsigned group, bool enable)
283{
284 struct samsung_pinctrl_drv_data *drvdata;
285 const unsigned int *pins;
286 struct samsung_pin_bank *bank;
287 void __iomem *reg;
288 u32 mask, shift, data, pin_offset, cnt;
Tomasz Figa19846952013-03-18 22:31:50 +0100289 unsigned long flags;
Thomas Abraham30574f02012-09-07 06:07:19 +0900290
291 drvdata = pinctrl_dev_get_drvdata(pctldev);
292 pins = drvdata->pin_groups[group].pins;
293
294 /*
295 * for each pin in the pin group selected, program the correspoding pin
296 * pin function number in the config register.
297 */
298 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
Tomasz Figa499147c2013-03-18 22:31:52 +0100299 struct samsung_pin_bank_type *type;
300
Tomasz Figa62f14c02012-10-11 10:11:08 +0200301 pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base,
Thomas Abraham30574f02012-09-07 06:07:19 +0900302 &reg, &pin_offset, &bank);
Tomasz Figa499147c2013-03-18 22:31:52 +0100303 type = bank->type;
304 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
305 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
Tomasz Figac16150d2013-03-18 22:31:54 +0100306 if (shift >= 32) {
307 /* Some banks have two config registers */
308 shift -= 32;
309 reg += 4;
310 }
Thomas Abraham30574f02012-09-07 06:07:19 +0900311
Tomasz Figa19846952013-03-18 22:31:50 +0100312 spin_lock_irqsave(&bank->slock, flags);
313
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100314 data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
Thomas Abraham30574f02012-09-07 06:07:19 +0900315 data &= ~(mask << shift);
316 if (enable)
317 data |= drvdata->pin_groups[group].func << shift;
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100318 writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
Tomasz Figa19846952013-03-18 22:31:50 +0100319
320 spin_unlock_irqrestore(&bank->slock, flags);
Thomas Abraham30574f02012-09-07 06:07:19 +0900321 }
322}
323
324/* enable a specified pinmux by writing to registers */
325static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
326 unsigned group)
327{
328 samsung_pinmux_setup(pctldev, selector, group, true);
329 return 0;
330}
331
332/* disable a specified pinmux by writing to registers */
333static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
334 unsigned selector, unsigned group)
335{
336 samsung_pinmux_setup(pctldev, selector, group, false);
337}
338
339/*
340 * The calls to gpio_direction_output() and gpio_direction_input()
341 * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
342 * function called from the gpiolib interface).
343 */
344static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
345 struct pinctrl_gpio_range *range, unsigned offset, bool input)
346{
Tomasz Figa499147c2013-03-18 22:31:52 +0100347 struct samsung_pin_bank_type *type;
Thomas Abraham30574f02012-09-07 06:07:19 +0900348 struct samsung_pin_bank *bank;
Tomasz Figa62f14c02012-10-11 10:11:08 +0200349 struct samsung_pinctrl_drv_data *drvdata;
Thomas Abraham30574f02012-09-07 06:07:19 +0900350 void __iomem *reg;
351 u32 data, pin_offset, mask, shift;
Tomasz Figa19846952013-03-18 22:31:50 +0100352 unsigned long flags;
Thomas Abraham30574f02012-09-07 06:07:19 +0900353
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200354 bank = gc_to_pin_bank(range->gc);
Tomasz Figa499147c2013-03-18 22:31:52 +0100355 type = bank->type;
Tomasz Figa62f14c02012-10-11 10:11:08 +0200356 drvdata = pinctrl_dev_get_drvdata(pctldev);
357
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200358 pin_offset = offset - bank->pin_base;
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100359 reg = drvdata->virt_base + bank->pctl_offset +
360 type->reg_offset[PINCFG_TYPE_FUNC];
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200361
Tomasz Figa499147c2013-03-18 22:31:52 +0100362 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
363 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
Tomasz Figac16150d2013-03-18 22:31:54 +0100364 if (shift >= 32) {
365 /* Some banks have two config registers */
366 shift -= 32;
367 reg += 4;
368 }
Thomas Abraham30574f02012-09-07 06:07:19 +0900369
Tomasz Figa19846952013-03-18 22:31:50 +0100370 spin_lock_irqsave(&bank->slock, flags);
371
Thomas Abraham30574f02012-09-07 06:07:19 +0900372 data = readl(reg);
373 data &= ~(mask << shift);
374 if (!input)
375 data |= FUNC_OUTPUT << shift;
376 writel(data, reg);
Tomasz Figa19846952013-03-18 22:31:50 +0100377
378 spin_unlock_irqrestore(&bank->slock, flags);
379
Thomas Abraham30574f02012-09-07 06:07:19 +0900380 return 0;
381}
382
383/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
Laurent Pinchart022ab142013-02-16 10:25:07 +0100384static const struct pinmux_ops samsung_pinmux_ops = {
Thomas Abraham30574f02012-09-07 06:07:19 +0900385 .get_functions_count = samsung_get_functions_count,
386 .get_function_name = samsung_pinmux_get_fname,
387 .get_function_groups = samsung_pinmux_get_groups,
388 .enable = samsung_pinmux_enable,
389 .disable = samsung_pinmux_disable,
390 .gpio_set_direction = samsung_pinmux_gpio_set_direction,
391};
392
393/* set or get the pin config settings for a specified pin */
394static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
395 unsigned long *config, bool set)
396{
397 struct samsung_pinctrl_drv_data *drvdata;
Tomasz Figa499147c2013-03-18 22:31:52 +0100398 struct samsung_pin_bank_type *type;
Thomas Abraham30574f02012-09-07 06:07:19 +0900399 struct samsung_pin_bank *bank;
400 void __iomem *reg_base;
401 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
402 u32 data, width, pin_offset, mask, shift;
403 u32 cfg_value, cfg_reg;
Tomasz Figa19846952013-03-18 22:31:50 +0100404 unsigned long flags;
Thomas Abraham30574f02012-09-07 06:07:19 +0900405
406 drvdata = pinctrl_dev_get_drvdata(pctldev);
Tomasz Figa62f14c02012-10-11 10:11:08 +0200407 pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, &reg_base,
Thomas Abraham30574f02012-09-07 06:07:19 +0900408 &pin_offset, &bank);
Tomasz Figa499147c2013-03-18 22:31:52 +0100409 type = bank->type;
Thomas Abraham30574f02012-09-07 06:07:19 +0900410
Tomasz Figa499147c2013-03-18 22:31:52 +0100411 if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
Tomasz Figa7c367d32012-10-11 10:11:07 +0200412 return -EINVAL;
413
Tomasz Figa499147c2013-03-18 22:31:52 +0100414 width = type->fld_width[cfg_type];
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100415 cfg_reg = type->reg_offset[cfg_type];
Tomasz Figa499147c2013-03-18 22:31:52 +0100416
Tomasz Figa19846952013-03-18 22:31:50 +0100417 spin_lock_irqsave(&bank->slock, flags);
418
Thomas Abraham30574f02012-09-07 06:07:19 +0900419 mask = (1 << width) - 1;
420 shift = pin_offset * width;
421 data = readl(reg_base + cfg_reg);
422
423 if (set) {
424 cfg_value = PINCFG_UNPACK_VALUE(*config);
425 data &= ~(mask << shift);
426 data |= (cfg_value << shift);
427 writel(data, reg_base + cfg_reg);
428 } else {
429 data >>= shift;
430 data &= mask;
431 *config = PINCFG_PACK(cfg_type, data);
432 }
Tomasz Figa19846952013-03-18 22:31:50 +0100433
434 spin_unlock_irqrestore(&bank->slock, flags);
435
Thomas Abraham30574f02012-09-07 06:07:19 +0900436 return 0;
437}
438
439/* set the pin config settings for a specified pin */
440static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
441 unsigned long config)
442{
443 return samsung_pinconf_rw(pctldev, pin, &config, true);
444}
445
446/* get the pin config settings for a specified pin */
447static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
448 unsigned long *config)
449{
450 return samsung_pinconf_rw(pctldev, pin, config, false);
451}
452
453/* set the pin config settings for a specified pin group */
454static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
455 unsigned group, unsigned long config)
456{
457 struct samsung_pinctrl_drv_data *drvdata;
458 const unsigned int *pins;
459 unsigned int cnt;
460
461 drvdata = pinctrl_dev_get_drvdata(pctldev);
462 pins = drvdata->pin_groups[group].pins;
463
464 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
465 samsung_pinconf_set(pctldev, pins[cnt], config);
466
467 return 0;
468}
469
470/* get the pin config settings for a specified pin group */
471static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
472 unsigned int group, unsigned long *config)
473{
474 struct samsung_pinctrl_drv_data *drvdata;
475 const unsigned int *pins;
476
477 drvdata = pinctrl_dev_get_drvdata(pctldev);
478 pins = drvdata->pin_groups[group].pins;
479 samsung_pinconf_get(pctldev, pins[0], config);
480 return 0;
481}
482
483/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
Laurent Pinchart022ab142013-02-16 10:25:07 +0100484static const struct pinconf_ops samsung_pinconf_ops = {
Thomas Abraham30574f02012-09-07 06:07:19 +0900485 .pin_config_get = samsung_pinconf_get,
486 .pin_config_set = samsung_pinconf_set,
487 .pin_config_group_get = samsung_pinconf_group_get,
488 .pin_config_group_set = samsung_pinconf_group_set,
489};
490
491/* gpiolib gpio_set callback function */
492static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
493{
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200494 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
Tomasz Figa499147c2013-03-18 22:31:52 +0100495 struct samsung_pin_bank_type *type = bank->type;
Tomasz Figa19846952013-03-18 22:31:50 +0100496 unsigned long flags;
Thomas Abraham30574f02012-09-07 06:07:19 +0900497 void __iomem *reg;
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200498 u32 data;
Thomas Abraham30574f02012-09-07 06:07:19 +0900499
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200500 reg = bank->drvdata->virt_base + bank->pctl_offset;
Tomasz Figa62f14c02012-10-11 10:11:08 +0200501
Tomasz Figa19846952013-03-18 22:31:50 +0100502 spin_lock_irqsave(&bank->slock, flags);
503
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100504 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200505 data &= ~(1 << offset);
Thomas Abraham30574f02012-09-07 06:07:19 +0900506 if (value)
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200507 data |= 1 << offset;
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100508 writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
Tomasz Figa19846952013-03-18 22:31:50 +0100509
510 spin_unlock_irqrestore(&bank->slock, flags);
Thomas Abraham30574f02012-09-07 06:07:19 +0900511}
512
513/* gpiolib gpio_get callback function */
514static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
515{
516 void __iomem *reg;
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200517 u32 data;
518 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100519 struct samsung_pin_bank_type *type = bank->type;
Thomas Abraham30574f02012-09-07 06:07:19 +0900520
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200521 reg = bank->drvdata->virt_base + bank->pctl_offset;
Tomasz Figa62f14c02012-10-11 10:11:08 +0200522
Tomasz Figa43fc9e72013-03-18 22:31:53 +0100523 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200524 data >>= offset;
Thomas Abraham30574f02012-09-07 06:07:19 +0900525 data &= 1;
526 return data;
527}
528
529/*
530 * gpiolib gpio_direction_input callback function. The setting of the pin
531 * mux function as 'gpio input' will be handled by the pinctrl susbsystem
532 * interface.
533 */
534static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
535{
536 return pinctrl_gpio_direction_input(gc->base + offset);
537}
538
539/*
540 * gpiolib gpio_direction_output callback function. The setting of the pin
541 * mux function as 'gpio output' will be handled by the pinctrl susbsystem
542 * interface.
543 */
544static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
545 int value)
546{
547 samsung_gpio_set(gc, offset, value);
548 return pinctrl_gpio_direction_output(gc->base + offset);
549}
550
551/*
Tomasz Figaa19fe2d2012-10-11 10:11:20 +0200552 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
553 * and a virtual IRQ, if not already present.
554 */
555static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
556{
557 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
558 unsigned int virq;
559
560 if (!bank->irq_domain)
561 return -ENXIO;
562
563 virq = irq_create_mapping(bank->irq_domain, offset);
564
565 return (virq) ? : -ENXIO;
566}
567
568/*
Thomas Abraham30574f02012-09-07 06:07:19 +0900569 * Parse the pin names listed in the 'samsung,pins' property and convert it
570 * into a list of gpio numbers are create a pin group from it.
571 */
Greg Kroah-Hartman150632b2012-12-21 13:10:23 -0800572static int samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
573 struct device_node *cfg_np,
574 struct pinctrl_desc *pctl,
575 unsigned int **pin_list,
576 unsigned int *npins)
Thomas Abraham30574f02012-09-07 06:07:19 +0900577{
578 struct device *dev = &pdev->dev;
579 struct property *prop;
580 struct pinctrl_pin_desc const *pdesc = pctl->pins;
581 unsigned int idx = 0, cnt;
582 const char *pin_name;
583
584 *npins = of_property_count_strings(cfg_np, "samsung,pins");
Tushar Behera4a991b42012-11-19 09:45:19 +0900585 if (IS_ERR_VALUE(*npins)) {
Thomas Abraham30574f02012-09-07 06:07:19 +0900586 dev_err(dev, "invalid pin list in %s node", cfg_np->name);
587 return -EINVAL;
588 }
589
590 *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
591 if (!*pin_list) {
592 dev_err(dev, "failed to allocate memory for pin list\n");
593 return -ENOMEM;
594 }
595
596 of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
597 for (cnt = 0; cnt < pctl->npins; cnt++) {
598 if (pdesc[cnt].name) {
599 if (!strcmp(pin_name, pdesc[cnt].name)) {
600 (*pin_list)[idx++] = pdesc[cnt].number;
601 break;
602 }
603 }
604 }
605 if (cnt == pctl->npins) {
606 dev_err(dev, "pin %s not valid in %s node\n",
607 pin_name, cfg_np->name);
608 devm_kfree(dev, *pin_list);
609 return -EINVAL;
610 }
611 }
612
613 return 0;
614}
615
616/*
617 * Parse the information about all the available pin groups and pin functions
618 * from device node of the pin-controller. A pin group is formed with all
619 * the pins listed in the "samsung,pins" property.
620 */
Greg Kroah-Hartman150632b2012-12-21 13:10:23 -0800621static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
622 struct samsung_pinctrl_drv_data *drvdata)
Thomas Abraham30574f02012-09-07 06:07:19 +0900623{
624 struct device *dev = &pdev->dev;
625 struct device_node *dev_np = dev->of_node;
626 struct device_node *cfg_np;
627 struct samsung_pin_group *groups, *grp;
628 struct samsung_pmx_func *functions, *func;
629 unsigned *pin_list;
630 unsigned int npins, grp_cnt, func_idx = 0;
631 char *gname, *fname;
632 int ret;
633
634 grp_cnt = of_get_child_count(dev_np);
635 if (!grp_cnt)
636 return -EINVAL;
637
638 groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
639 if (!groups) {
640 dev_err(dev, "failed allocate memory for ping group list\n");
641 return -EINVAL;
642 }
643 grp = groups;
644
645 functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
646 if (!functions) {
647 dev_err(dev, "failed to allocate memory for function list\n");
648 return -EINVAL;
649 }
650 func = functions;
651
652 /*
653 * Iterate over all the child nodes of the pin controller node
654 * and create pin groups and pin function lists.
655 */
656 for_each_child_of_node(dev_np, cfg_np) {
657 u32 function;
Tomasz Figa724e56a2012-10-11 10:11:11 +0200658 if (!of_find_property(cfg_np, "samsung,pins", NULL))
Thomas Abraham30574f02012-09-07 06:07:19 +0900659 continue;
660
661 ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
662 &drvdata->pctl, &pin_list, &npins);
663 if (ret)
664 return ret;
665
666 /* derive pin group name from the node name */
667 gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
668 GFP_KERNEL);
669 if (!gname) {
670 dev_err(dev, "failed to alloc memory for group name\n");
671 return -ENOMEM;
672 }
673 sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
674
675 grp->name = gname;
676 grp->pins = pin_list;
677 grp->num_pins = npins;
678 of_property_read_u32(cfg_np, "samsung,pin-function", &function);
679 grp->func = function;
680 grp++;
681
682 if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
683 continue;
684
685 /* derive function name from the node name */
686 fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
687 GFP_KERNEL);
688 if (!fname) {
689 dev_err(dev, "failed to alloc memory for func name\n");
690 return -ENOMEM;
691 }
692 sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
693
694 func->name = fname;
695 func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
696 if (!func->groups) {
697 dev_err(dev, "failed to alloc memory for group list "
698 "in pin function");
699 return -ENOMEM;
700 }
701 func->groups[0] = gname;
702 func->num_groups = 1;
703 func++;
704 func_idx++;
705 }
706
707 drvdata->pin_groups = groups;
708 drvdata->nr_groups = grp_cnt;
709 drvdata->pmx_functions = functions;
710 drvdata->nr_functions = func_idx;
711
712 return 0;
713}
714
715/* register the pinctrl interface with the pinctrl subsystem */
Greg Kroah-Hartman150632b2012-12-21 13:10:23 -0800716static int samsung_pinctrl_register(struct platform_device *pdev,
717 struct samsung_pinctrl_drv_data *drvdata)
Thomas Abraham30574f02012-09-07 06:07:19 +0900718{
719 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
720 struct pinctrl_pin_desc *pindesc, *pdesc;
721 struct samsung_pin_bank *pin_bank;
722 char *pin_names;
723 int pin, bank, ret;
724
725 ctrldesc->name = "samsung-pinctrl";
726 ctrldesc->owner = THIS_MODULE;
727 ctrldesc->pctlops = &samsung_pctrl_ops;
728 ctrldesc->pmxops = &samsung_pinmux_ops;
729 ctrldesc->confops = &samsung_pinconf_ops;
730
731 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
732 drvdata->ctrl->nr_pins, GFP_KERNEL);
733 if (!pindesc) {
734 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
735 return -ENOMEM;
736 }
737 ctrldesc->pins = pindesc;
738 ctrldesc->npins = drvdata->ctrl->nr_pins;
Thomas Abraham30574f02012-09-07 06:07:19 +0900739
740 /* dynamically populate the pin number and pin name for pindesc */
741 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
742 pdesc->number = pin + drvdata->ctrl->base;
743
744 /*
745 * allocate space for storing the dynamically generated names for all
746 * the pins which belong to this pin-controller.
747 */
748 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
749 drvdata->ctrl->nr_pins, GFP_KERNEL);
750 if (!pin_names) {
751 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
752 return -ENOMEM;
753 }
754
755 /* for each pin, the name of the pin is pin-bank name + pin number */
756 for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
757 pin_bank = &drvdata->ctrl->pin_banks[bank];
758 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
759 sprintf(pin_names, "%s-%d", pin_bank->name, pin);
760 pdesc = pindesc + pin_bank->pin_base + pin;
761 pdesc->name = pin_names;
762 pin_names += PIN_NAME_LENGTH;
763 }
764 }
765
766 drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
767 if (!drvdata->pctl_dev) {
768 dev_err(&pdev->dev, "could not register pinctrl driver\n");
769 return -EINVAL;
770 }
771
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200772 for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
773 pin_bank = &drvdata->ctrl->pin_banks[bank];
774 pin_bank->grange.name = pin_bank->name;
775 pin_bank->grange.id = bank;
776 pin_bank->grange.pin_base = pin_bank->pin_base;
777 pin_bank->grange.base = pin_bank->gpio_chip.base;
778 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
779 pin_bank->grange.gc = &pin_bank->gpio_chip;
780 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
781 }
Thomas Abraham30574f02012-09-07 06:07:19 +0900782
783 ret = samsung_pinctrl_parse_dt(pdev, drvdata);
784 if (ret) {
785 pinctrl_unregister(drvdata->pctl_dev);
786 return ret;
787 }
788
789 return 0;
790}
791
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200792static const struct gpio_chip samsung_gpiolib_chip = {
793 .set = samsung_gpio_set,
794 .get = samsung_gpio_get,
795 .direction_input = samsung_gpio_direction_input,
796 .direction_output = samsung_gpio_direction_output,
Tomasz Figaa19fe2d2012-10-11 10:11:20 +0200797 .to_irq = samsung_gpio_to_irq,
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200798 .owner = THIS_MODULE,
799};
800
Thomas Abraham30574f02012-09-07 06:07:19 +0900801/* register the gpiolib interface with the gpiolib subsystem */
Greg Kroah-Hartman150632b2012-12-21 13:10:23 -0800802static int samsung_gpiolib_register(struct platform_device *pdev,
803 struct samsung_pinctrl_drv_data *drvdata)
Thomas Abraham30574f02012-09-07 06:07:19 +0900804{
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200805 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
806 struct samsung_pin_bank *bank = ctrl->pin_banks;
Thomas Abraham30574f02012-09-07 06:07:19 +0900807 struct gpio_chip *gc;
808 int ret;
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200809 int i;
Thomas Abraham30574f02012-09-07 06:07:19 +0900810
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200811 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
812 bank->gpio_chip = samsung_gpiolib_chip;
Thomas Abraham30574f02012-09-07 06:07:19 +0900813
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200814 gc = &bank->gpio_chip;
815 gc->base = ctrl->base + bank->pin_base;
816 gc->ngpio = bank->nr_pins;
817 gc->dev = &pdev->dev;
818 gc->of_node = bank->of_node;
819 gc->label = bank->name;
820
821 ret = gpiochip_add(gc);
822 if (ret) {
823 dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
824 gc->label, ret);
825 goto fail;
826 }
Thomas Abraham30574f02012-09-07 06:07:19 +0900827 }
828
829 return 0;
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200830
831fail:
832 for (--i, --bank; i >= 0; --i, --bank)
833 if (gpiochip_remove(&bank->gpio_chip))
834 dev_err(&pdev->dev, "gpio chip %s remove failed\n",
835 bank->gpio_chip.label);
836 return ret;
Thomas Abraham30574f02012-09-07 06:07:19 +0900837}
838
839/* unregister the gpiolib interface with the gpiolib subsystem */
Greg Kroah-Hartman150632b2012-12-21 13:10:23 -0800840static int samsung_gpiolib_unregister(struct platform_device *pdev,
841 struct samsung_pinctrl_drv_data *drvdata)
Thomas Abraham30574f02012-09-07 06:07:19 +0900842{
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200843 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
844 struct samsung_pin_bank *bank = ctrl->pin_banks;
845 int ret = 0;
846 int i;
847
848 for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
849 ret = gpiochip_remove(&bank->gpio_chip);
850
851 if (ret)
Thomas Abraham30574f02012-09-07 06:07:19 +0900852 dev_err(&pdev->dev, "gpio chip remove failed\n");
Tomasz Figad3a7b9e2012-10-11 10:11:17 +0200853
854 return ret;
Thomas Abraham30574f02012-09-07 06:07:19 +0900855}
856
857static const struct of_device_id samsung_pinctrl_dt_match[];
858
859/* retrieve the soc specific data */
Tomasz Figa2f0253f2012-09-21 07:34:04 +0900860static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
Tomasz Figa6defe9a2012-10-11 10:11:14 +0200861 struct samsung_pinctrl_drv_data *d,
Thomas Abraham30574f02012-09-07 06:07:19 +0900862 struct platform_device *pdev)
863{
864 int id;
865 const struct of_device_id *match;
Tomasz Figa6defe9a2012-10-11 10:11:14 +0200866 struct device_node *node = pdev->dev.of_node;
Tomasz Figaab663782012-10-11 10:11:13 +0200867 struct device_node *np;
Tomasz Figa40ba6222012-10-11 10:11:09 +0200868 struct samsung_pin_ctrl *ctrl;
869 struct samsung_pin_bank *bank;
870 int i;
Thomas Abraham30574f02012-09-07 06:07:19 +0900871
Tomasz Figa6defe9a2012-10-11 10:11:14 +0200872 id = of_alias_get_id(node, "pinctrl");
Thomas Abraham30574f02012-09-07 06:07:19 +0900873 if (id < 0) {
874 dev_err(&pdev->dev, "failed to get alias id\n");
875 return NULL;
876 }
877 match = of_match_node(samsung_pinctrl_dt_match, node);
Tomasz Figa40ba6222012-10-11 10:11:09 +0200878 ctrl = (struct samsung_pin_ctrl *)match->data + id;
879
880 bank = ctrl->pin_banks;
881 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
Tomasz Figa19846952013-03-18 22:31:50 +0100882 spin_lock_init(&bank->slock);
Tomasz Figa6defe9a2012-10-11 10:11:14 +0200883 bank->drvdata = d;
Tomasz Figa40ba6222012-10-11 10:11:09 +0200884 bank->pin_base = ctrl->nr_pins;
885 ctrl->nr_pins += bank->nr_pins;
Tomasz Figa40ba6222012-10-11 10:11:09 +0200886 }
887
Tomasz Figaab663782012-10-11 10:11:13 +0200888 for_each_child_of_node(node, np) {
889 if (!of_find_property(np, "gpio-controller", NULL))
890 continue;
891 bank = ctrl->pin_banks;
892 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
893 if (!strcmp(bank->name, np->name)) {
894 bank->of_node = np;
895 break;
896 }
897 }
898 }
899
Tomasz Figa40ba6222012-10-11 10:11:09 +0200900 ctrl->base = pin_base;
901 pin_base += ctrl->nr_pins;
902
903 return ctrl;
Thomas Abraham30574f02012-09-07 06:07:19 +0900904}
905
Greg Kroah-Hartman150632b2012-12-21 13:10:23 -0800906static int samsung_pinctrl_probe(struct platform_device *pdev)
Thomas Abraham30574f02012-09-07 06:07:19 +0900907{
908 struct samsung_pinctrl_drv_data *drvdata;
909 struct device *dev = &pdev->dev;
910 struct samsung_pin_ctrl *ctrl;
911 struct resource *res;
912 int ret;
913
914 if (!dev->of_node) {
915 dev_err(dev, "device tree node not found\n");
916 return -ENODEV;
917 }
918
Thomas Abraham30574f02012-09-07 06:07:19 +0900919 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
920 if (!drvdata) {
921 dev_err(dev, "failed to allocate memory for driver's "
922 "private data\n");
923 return -ENOMEM;
924 }
Tomasz Figa6defe9a2012-10-11 10:11:14 +0200925
926 ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
927 if (!ctrl) {
928 dev_err(&pdev->dev, "driver data not available\n");
929 return -EINVAL;
930 }
Thomas Abraham30574f02012-09-07 06:07:19 +0900931 drvdata->ctrl = ctrl;
932 drvdata->dev = dev;
933
934 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
935 if (!res) {
936 dev_err(dev, "cannot find IO resource\n");
937 return -ENOENT;
938 }
939
Thierry Reding9e0c1fb2013-01-21 11:09:14 +0100940 drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
941 if (IS_ERR(drvdata->virt_base))
942 return PTR_ERR(drvdata->virt_base);
Thomas Abraham30574f02012-09-07 06:07:19 +0900943
944 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
945 if (res)
946 drvdata->irq = res->start;
947
948 ret = samsung_gpiolib_register(pdev, drvdata);
949 if (ret)
950 return ret;
951
952 ret = samsung_pinctrl_register(pdev, drvdata);
953 if (ret) {
954 samsung_gpiolib_unregister(pdev, drvdata);
955 return ret;
956 }
957
958 if (ctrl->eint_gpio_init)
959 ctrl->eint_gpio_init(drvdata);
960 if (ctrl->eint_wkup_init)
961 ctrl->eint_wkup_init(drvdata);
962
963 platform_set_drvdata(pdev, drvdata);
964 return 0;
965}
966
967static const struct of_device_id samsung_pinctrl_dt_match[] = {
Tomasz Figad5517be2013-03-18 22:31:51 +0100968#ifdef CONFIG_PINCTRL_EXYNOS
Kukjin Kimb533c862013-01-02 16:05:42 -0800969 { .compatible = "samsung,exynos4210-pinctrl",
Thomas Abraham30574f02012-09-07 06:07:19 +0900970 .data = (void *)exynos4210_pin_ctrl },
Kukjin Kimb533c862013-01-02 16:05:42 -0800971 { .compatible = "samsung,exynos4x12-pinctrl",
Tomasz Figa6edc7942012-11-07 08:44:59 +0900972 .data = (void *)exynos4x12_pin_ctrl },
Tomasz Figad5517be2013-03-18 22:31:51 +0100973#endif
Tomasz Figa61dd7262013-03-18 22:31:55 +0100974#ifdef CONFIG_PINCTRL_S3C64XX
975 { .compatible = "samsung,s3c64xx-pinctrl",
976 .data = s3c64xx_pin_ctrl },
977#endif
Thomas Abraham30574f02012-09-07 06:07:19 +0900978 {},
979};
980MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
981
982static struct platform_driver samsung_pinctrl_driver = {
983 .probe = samsung_pinctrl_probe,
984 .driver = {
985 .name = "samsung-pinctrl",
986 .owner = THIS_MODULE,
987 .of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
988 },
989};
990
991static int __init samsung_pinctrl_drv_register(void)
992{
993 return platform_driver_register(&samsung_pinctrl_driver);
994}
995postcore_initcall(samsung_pinctrl_drv_register);
996
997static void __exit samsung_pinctrl_drv_unregister(void)
998{
999 platform_driver_unregister(&samsung_pinctrl_driver);
1000}
1001module_exit(samsung_pinctrl_drv_unregister);
1002
1003MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
1004MODULE_DESCRIPTION("Samsung pinctrl driver");
1005MODULE_LICENSE("GPL v2");