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30574f0d TA |
1 | /* |
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> | |
29 | ||
30 | #include "core.h" | |
31 | #include "pinctrl-samsung.h" | |
32 | ||
33 | #define GROUP_SUFFIX "-grp" | |
34 | #define GSUFFIX_LEN sizeof(GROUP_SUFFIX) | |
35 | #define FUNCTION_SUFFIX "-mux" | |
36 | #define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX) | |
37 | ||
38 | /* list of all possible config options supported */ | |
39 | struct pin_config { | |
40 | char *prop_cfg; | |
41 | unsigned int cfg_type; | |
42 | } pcfgs[] = { | |
43 | { "samsung,pin-pud", PINCFG_TYPE_PUD }, | |
44 | { "samsung,pin-drv", PINCFG_TYPE_DRV }, | |
45 | { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN }, | |
46 | { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN }, | |
47 | }; | |
48 | ||
40ba6227 TF |
49 | static unsigned int pin_base = 0; |
50 | ||
d3a7b9e3 TF |
51 | static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc) |
52 | { | |
53 | return container_of(gc, struct samsung_pin_bank, gpio_chip); | |
54 | } | |
55 | ||
30574f0d TA |
56 | /* check if the selector is a valid pin group selector */ |
57 | static int samsung_get_group_count(struct pinctrl_dev *pctldev) | |
58 | { | |
59 | struct samsung_pinctrl_drv_data *drvdata; | |
60 | ||
61 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
62 | return drvdata->nr_groups; | |
63 | } | |
64 | ||
65 | /* return the name of the group selected by the group selector */ | |
66 | static const char *samsung_get_group_name(struct pinctrl_dev *pctldev, | |
67 | unsigned selector) | |
68 | { | |
69 | struct samsung_pinctrl_drv_data *drvdata; | |
70 | ||
71 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
72 | return drvdata->pin_groups[selector].name; | |
73 | } | |
74 | ||
75 | /* return the pin numbers associated with the specified group */ | |
76 | static int samsung_get_group_pins(struct pinctrl_dev *pctldev, | |
77 | unsigned selector, const unsigned **pins, unsigned *num_pins) | |
78 | { | |
79 | struct samsung_pinctrl_drv_data *drvdata; | |
80 | ||
81 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
82 | *pins = drvdata->pin_groups[selector].pins; | |
83 | *num_pins = drvdata->pin_groups[selector].num_pins; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | /* create pinctrl_map entries by parsing device tree nodes */ | |
88 | static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev, | |
89 | struct device_node *np, struct pinctrl_map **maps, | |
90 | unsigned *nmaps) | |
91 | { | |
92 | struct device *dev = pctldev->dev; | |
93 | struct pinctrl_map *map; | |
94 | unsigned long *cfg = NULL; | |
95 | char *gname, *fname; | |
96 | int cfg_cnt = 0, map_cnt = 0, idx = 0; | |
97 | ||
98 | /* count the number of config options specfied in the node */ | |
99 | for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) { | |
100 | if (of_find_property(np, pcfgs[idx].prop_cfg, NULL)) | |
101 | cfg_cnt++; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Find out the number of map entries to create. All the config options | |
106 | * can be accomadated into a single config map entry. | |
107 | */ | |
108 | if (cfg_cnt) | |
109 | map_cnt = 1; | |
110 | if (of_find_property(np, "samsung,pin-function", NULL)) | |
111 | map_cnt++; | |
112 | if (!map_cnt) { | |
113 | dev_err(dev, "node %s does not have either config or function " | |
114 | "configurations\n", np->name); | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
118 | /* Allocate memory for pin-map entries */ | |
119 | map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL); | |
120 | if (!map) { | |
121 | dev_err(dev, "could not alloc memory for pin-maps\n"); | |
122 | return -ENOMEM; | |
123 | } | |
124 | *nmaps = 0; | |
125 | ||
126 | /* | |
127 | * Allocate memory for pin group name. The pin group name is derived | |
128 | * from the node name from which these map entries are be created. | |
129 | */ | |
130 | gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL); | |
131 | if (!gname) { | |
132 | dev_err(dev, "failed to alloc memory for group name\n"); | |
133 | goto free_map; | |
134 | } | |
135 | sprintf(gname, "%s%s", np->name, GROUP_SUFFIX); | |
136 | ||
137 | /* | |
138 | * don't have config options? then skip over to creating function | |
139 | * map entries. | |
140 | */ | |
141 | if (!cfg_cnt) | |
142 | goto skip_cfgs; | |
143 | ||
144 | /* Allocate memory for config entries */ | |
145 | cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL); | |
146 | if (!cfg) { | |
147 | dev_err(dev, "failed to alloc memory for configs\n"); | |
148 | goto free_gname; | |
149 | } | |
150 | ||
151 | /* Prepare a list of config settings */ | |
152 | for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) { | |
153 | u32 value; | |
154 | if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value)) | |
155 | cfg[cfg_cnt++] = | |
156 | PINCFG_PACK(pcfgs[idx].cfg_type, value); | |
157 | } | |
158 | ||
159 | /* create the config map entry */ | |
160 | map[*nmaps].data.configs.group_or_pin = gname; | |
161 | map[*nmaps].data.configs.configs = cfg; | |
162 | map[*nmaps].data.configs.num_configs = cfg_cnt; | |
163 | map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP; | |
164 | *nmaps += 1; | |
165 | ||
166 | skip_cfgs: | |
167 | /* create the function map entry */ | |
168 | if (of_find_property(np, "samsung,pin-function", NULL)) { | |
169 | fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL); | |
170 | if (!fname) { | |
171 | dev_err(dev, "failed to alloc memory for func name\n"); | |
172 | goto free_cfg; | |
173 | } | |
174 | sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX); | |
175 | ||
176 | map[*nmaps].data.mux.group = gname; | |
177 | map[*nmaps].data.mux.function = fname; | |
178 | map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP; | |
179 | *nmaps += 1; | |
180 | } | |
181 | ||
182 | *maps = map; | |
183 | return 0; | |
184 | ||
185 | free_cfg: | |
186 | kfree(cfg); | |
187 | free_gname: | |
188 | kfree(gname); | |
189 | free_map: | |
190 | kfree(map); | |
191 | return -ENOMEM; | |
192 | } | |
193 | ||
194 | /* free the memory allocated to hold the pin-map table */ | |
195 | static void samsung_dt_free_map(struct pinctrl_dev *pctldev, | |
196 | struct pinctrl_map *map, unsigned num_maps) | |
197 | { | |
198 | int idx; | |
199 | ||
200 | for (idx = 0; idx < num_maps; idx++) { | |
201 | if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) { | |
202 | kfree(map[idx].data.mux.function); | |
203 | if (!idx) | |
204 | kfree(map[idx].data.mux.group); | |
205 | } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) { | |
206 | kfree(map[idx].data.configs.configs); | |
207 | if (!idx) | |
208 | kfree(map[idx].data.configs.group_or_pin); | |
209 | } | |
210 | }; | |
211 | ||
212 | kfree(map); | |
213 | } | |
214 | ||
215 | /* list of pinctrl callbacks for the pinctrl core */ | |
216 | static struct pinctrl_ops samsung_pctrl_ops = { | |
217 | .get_groups_count = samsung_get_group_count, | |
218 | .get_group_name = samsung_get_group_name, | |
219 | .get_group_pins = samsung_get_group_pins, | |
220 | .dt_node_to_map = samsung_dt_node_to_map, | |
221 | .dt_free_map = samsung_dt_free_map, | |
222 | }; | |
223 | ||
224 | /* check if the selector is a valid pin function selector */ | |
225 | static int samsung_get_functions_count(struct pinctrl_dev *pctldev) | |
226 | { | |
227 | struct samsung_pinctrl_drv_data *drvdata; | |
228 | ||
229 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
230 | return drvdata->nr_functions; | |
231 | } | |
232 | ||
233 | /* return the name of the pin function specified */ | |
234 | static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev, | |
235 | unsigned selector) | |
236 | { | |
237 | struct samsung_pinctrl_drv_data *drvdata; | |
238 | ||
239 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
240 | return drvdata->pmx_functions[selector].name; | |
241 | } | |
242 | ||
243 | /* return the groups associated for the specified function selector */ | |
244 | static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev, | |
245 | unsigned selector, const char * const **groups, | |
246 | unsigned * const num_groups) | |
247 | { | |
248 | struct samsung_pinctrl_drv_data *drvdata; | |
249 | ||
250 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
251 | *groups = drvdata->pmx_functions[selector].groups; | |
252 | *num_groups = drvdata->pmx_functions[selector].num_groups; | |
253 | return 0; | |
254 | } | |
255 | ||
256 | /* | |
257 | * given a pin number that is local to a pin controller, find out the pin bank | |
258 | * and the register base of the pin bank. | |
259 | */ | |
62f14c0e TF |
260 | static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata, |
261 | unsigned pin, void __iomem **reg, u32 *offset, | |
30574f0d TA |
262 | struct samsung_pin_bank **bank) |
263 | { | |
30574f0d TA |
264 | struct samsung_pin_bank *b; |
265 | ||
30574f0d TA |
266 | b = drvdata->ctrl->pin_banks; |
267 | ||
268 | while ((pin >= b->pin_base) && | |
269 | ((b->pin_base + b->nr_pins - 1) < pin)) | |
270 | b++; | |
271 | ||
272 | *reg = drvdata->virt_base + b->pctl_offset; | |
273 | *offset = pin - b->pin_base; | |
274 | if (bank) | |
275 | *bank = b; | |
276 | ||
277 | /* some banks have two config registers in a single bank */ | |
278 | if (*offset * b->func_width > BITS_PER_LONG) | |
279 | *reg += 4; | |
280 | } | |
281 | ||
282 | /* enable or disable a pinmux function */ | |
283 | static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector, | |
284 | unsigned group, bool enable) | |
285 | { | |
286 | struct samsung_pinctrl_drv_data *drvdata; | |
287 | const unsigned int *pins; | |
288 | struct samsung_pin_bank *bank; | |
289 | void __iomem *reg; | |
290 | u32 mask, shift, data, pin_offset, cnt; | |
291 | ||
292 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
293 | pins = drvdata->pin_groups[group].pins; | |
294 | ||
295 | /* | |
296 | * for each pin in the pin group selected, program the correspoding pin | |
297 | * pin function number in the config register. | |
298 | */ | |
299 | for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) { | |
62f14c0e | 300 | pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base, |
30574f0d TA |
301 | ®, &pin_offset, &bank); |
302 | mask = (1 << bank->func_width) - 1; | |
303 | shift = pin_offset * bank->func_width; | |
304 | ||
305 | data = readl(reg); | |
306 | data &= ~(mask << shift); | |
307 | if (enable) | |
308 | data |= drvdata->pin_groups[group].func << shift; | |
309 | writel(data, reg); | |
310 | } | |
311 | } | |
312 | ||
313 | /* enable a specified pinmux by writing to registers */ | |
314 | static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector, | |
315 | unsigned group) | |
316 | { | |
317 | samsung_pinmux_setup(pctldev, selector, group, true); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /* disable a specified pinmux by writing to registers */ | |
322 | static void samsung_pinmux_disable(struct pinctrl_dev *pctldev, | |
323 | unsigned selector, unsigned group) | |
324 | { | |
325 | samsung_pinmux_setup(pctldev, selector, group, false); | |
326 | } | |
327 | ||
328 | /* | |
329 | * The calls to gpio_direction_output() and gpio_direction_input() | |
330 | * leads to this function call (via the pinctrl_gpio_direction_{input|output}() | |
331 | * function called from the gpiolib interface). | |
332 | */ | |
333 | static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev, | |
334 | struct pinctrl_gpio_range *range, unsigned offset, bool input) | |
335 | { | |
336 | struct samsung_pin_bank *bank; | |
62f14c0e | 337 | struct samsung_pinctrl_drv_data *drvdata; |
30574f0d TA |
338 | void __iomem *reg; |
339 | u32 data, pin_offset, mask, shift; | |
340 | ||
d3a7b9e3 | 341 | bank = gc_to_pin_bank(range->gc); |
62f14c0e TF |
342 | drvdata = pinctrl_dev_get_drvdata(pctldev); |
343 | ||
d3a7b9e3 TF |
344 | pin_offset = offset - bank->pin_base; |
345 | reg = drvdata->virt_base + bank->pctl_offset; | |
346 | ||
30574f0d TA |
347 | mask = (1 << bank->func_width) - 1; |
348 | shift = pin_offset * bank->func_width; | |
349 | ||
350 | data = readl(reg); | |
351 | data &= ~(mask << shift); | |
352 | if (!input) | |
353 | data |= FUNC_OUTPUT << shift; | |
354 | writel(data, reg); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* list of pinmux callbacks for the pinmux vertical in pinctrl core */ | |
359 | static struct pinmux_ops samsung_pinmux_ops = { | |
360 | .get_functions_count = samsung_get_functions_count, | |
361 | .get_function_name = samsung_pinmux_get_fname, | |
362 | .get_function_groups = samsung_pinmux_get_groups, | |
363 | .enable = samsung_pinmux_enable, | |
364 | .disable = samsung_pinmux_disable, | |
365 | .gpio_set_direction = samsung_pinmux_gpio_set_direction, | |
366 | }; | |
367 | ||
368 | /* set or get the pin config settings for a specified pin */ | |
369 | static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin, | |
370 | unsigned long *config, bool set) | |
371 | { | |
372 | struct samsung_pinctrl_drv_data *drvdata; | |
373 | struct samsung_pin_bank *bank; | |
374 | void __iomem *reg_base; | |
375 | enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config); | |
376 | u32 data, width, pin_offset, mask, shift; | |
377 | u32 cfg_value, cfg_reg; | |
378 | ||
379 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
62f14c0e | 380 | pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, ®_base, |
30574f0d TA |
381 | &pin_offset, &bank); |
382 | ||
383 | switch (cfg_type) { | |
384 | case PINCFG_TYPE_PUD: | |
385 | width = bank->pud_width; | |
386 | cfg_reg = PUD_REG; | |
387 | break; | |
388 | case PINCFG_TYPE_DRV: | |
389 | width = bank->drv_width; | |
390 | cfg_reg = DRV_REG; | |
391 | break; | |
392 | case PINCFG_TYPE_CON_PDN: | |
393 | width = bank->conpdn_width; | |
394 | cfg_reg = CONPDN_REG; | |
395 | break; | |
396 | case PINCFG_TYPE_PUD_PDN: | |
397 | width = bank->pudpdn_width; | |
398 | cfg_reg = PUDPDN_REG; | |
399 | break; | |
400 | default: | |
401 | WARN_ON(1); | |
402 | return -EINVAL; | |
403 | } | |
404 | ||
7c367d3d TF |
405 | if (!width) |
406 | return -EINVAL; | |
407 | ||
30574f0d TA |
408 | mask = (1 << width) - 1; |
409 | shift = pin_offset * width; | |
410 | data = readl(reg_base + cfg_reg); | |
411 | ||
412 | if (set) { | |
413 | cfg_value = PINCFG_UNPACK_VALUE(*config); | |
414 | data &= ~(mask << shift); | |
415 | data |= (cfg_value << shift); | |
416 | writel(data, reg_base + cfg_reg); | |
417 | } else { | |
418 | data >>= shift; | |
419 | data &= mask; | |
420 | *config = PINCFG_PACK(cfg_type, data); | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
425 | /* set the pin config settings for a specified pin */ | |
426 | static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, | |
427 | unsigned long config) | |
428 | { | |
429 | return samsung_pinconf_rw(pctldev, pin, &config, true); | |
430 | } | |
431 | ||
432 | /* get the pin config settings for a specified pin */ | |
433 | static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, | |
434 | unsigned long *config) | |
435 | { | |
436 | return samsung_pinconf_rw(pctldev, pin, config, false); | |
437 | } | |
438 | ||
439 | /* set the pin config settings for a specified pin group */ | |
440 | static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev, | |
441 | unsigned group, unsigned long config) | |
442 | { | |
443 | struct samsung_pinctrl_drv_data *drvdata; | |
444 | const unsigned int *pins; | |
445 | unsigned int cnt; | |
446 | ||
447 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
448 | pins = drvdata->pin_groups[group].pins; | |
449 | ||
450 | for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) | |
451 | samsung_pinconf_set(pctldev, pins[cnt], config); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | /* get the pin config settings for a specified pin group */ | |
457 | static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev, | |
458 | unsigned int group, unsigned long *config) | |
459 | { | |
460 | struct samsung_pinctrl_drv_data *drvdata; | |
461 | const unsigned int *pins; | |
462 | ||
463 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
464 | pins = drvdata->pin_groups[group].pins; | |
465 | samsung_pinconf_get(pctldev, pins[0], config); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */ | |
470 | static struct pinconf_ops samsung_pinconf_ops = { | |
471 | .pin_config_get = samsung_pinconf_get, | |
472 | .pin_config_set = samsung_pinconf_set, | |
473 | .pin_config_group_get = samsung_pinconf_group_get, | |
474 | .pin_config_group_set = samsung_pinconf_group_set, | |
475 | }; | |
476 | ||
477 | /* gpiolib gpio_set callback function */ | |
478 | static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value) | |
479 | { | |
d3a7b9e3 | 480 | struct samsung_pin_bank *bank = gc_to_pin_bank(gc); |
30574f0d | 481 | void __iomem *reg; |
d3a7b9e3 | 482 | u32 data; |
30574f0d | 483 | |
d3a7b9e3 | 484 | reg = bank->drvdata->virt_base + bank->pctl_offset; |
62f14c0e | 485 | |
30574f0d | 486 | data = readl(reg + DAT_REG); |
d3a7b9e3 | 487 | data &= ~(1 << offset); |
30574f0d | 488 | if (value) |
d3a7b9e3 | 489 | data |= 1 << offset; |
30574f0d TA |
490 | writel(data, reg + DAT_REG); |
491 | } | |
492 | ||
493 | /* gpiolib gpio_get callback function */ | |
494 | static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset) | |
495 | { | |
496 | void __iomem *reg; | |
d3a7b9e3 TF |
497 | u32 data; |
498 | struct samsung_pin_bank *bank = gc_to_pin_bank(gc); | |
62f14c0e | 499 | |
d3a7b9e3 | 500 | reg = bank->drvdata->virt_base + bank->pctl_offset; |
30574f0d | 501 | |
30574f0d | 502 | data = readl(reg + DAT_REG); |
d3a7b9e3 | 503 | data >>= offset; |
30574f0d TA |
504 | data &= 1; |
505 | return data; | |
506 | } | |
507 | ||
508 | /* | |
509 | * gpiolib gpio_direction_input callback function. The setting of the pin | |
510 | * mux function as 'gpio input' will be handled by the pinctrl susbsystem | |
511 | * interface. | |
512 | */ | |
513 | static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
514 | { | |
515 | return pinctrl_gpio_direction_input(gc->base + offset); | |
516 | } | |
517 | ||
518 | /* | |
519 | * gpiolib gpio_direction_output callback function. The setting of the pin | |
520 | * mux function as 'gpio output' will be handled by the pinctrl susbsystem | |
521 | * interface. | |
522 | */ | |
523 | static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset, | |
524 | int value) | |
525 | { | |
526 | samsung_gpio_set(gc, offset, value); | |
527 | return pinctrl_gpio_direction_output(gc->base + offset); | |
528 | } | |
529 | ||
530 | /* | |
531 | * Parse the pin names listed in the 'samsung,pins' property and convert it | |
532 | * into a list of gpio numbers are create a pin group from it. | |
533 | */ | |
534 | static int __init samsung_pinctrl_parse_dt_pins(struct platform_device *pdev, | |
535 | struct device_node *cfg_np, struct pinctrl_desc *pctl, | |
536 | unsigned int **pin_list, unsigned int *npins) | |
537 | { | |
538 | struct device *dev = &pdev->dev; | |
539 | struct property *prop; | |
540 | struct pinctrl_pin_desc const *pdesc = pctl->pins; | |
541 | unsigned int idx = 0, cnt; | |
542 | const char *pin_name; | |
543 | ||
544 | *npins = of_property_count_strings(cfg_np, "samsung,pins"); | |
545 | if (*npins < 0) { | |
546 | dev_err(dev, "invalid pin list in %s node", cfg_np->name); | |
547 | return -EINVAL; | |
548 | } | |
549 | ||
550 | *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL); | |
551 | if (!*pin_list) { | |
552 | dev_err(dev, "failed to allocate memory for pin list\n"); | |
553 | return -ENOMEM; | |
554 | } | |
555 | ||
556 | of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) { | |
557 | for (cnt = 0; cnt < pctl->npins; cnt++) { | |
558 | if (pdesc[cnt].name) { | |
559 | if (!strcmp(pin_name, pdesc[cnt].name)) { | |
560 | (*pin_list)[idx++] = pdesc[cnt].number; | |
561 | break; | |
562 | } | |
563 | } | |
564 | } | |
565 | if (cnt == pctl->npins) { | |
566 | dev_err(dev, "pin %s not valid in %s node\n", | |
567 | pin_name, cfg_np->name); | |
568 | devm_kfree(dev, *pin_list); | |
569 | return -EINVAL; | |
570 | } | |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Parse the information about all the available pin groups and pin functions | |
578 | * from device node of the pin-controller. A pin group is formed with all | |
579 | * the pins listed in the "samsung,pins" property. | |
580 | */ | |
581 | static int __init samsung_pinctrl_parse_dt(struct platform_device *pdev, | |
582 | struct samsung_pinctrl_drv_data *drvdata) | |
583 | { | |
584 | struct device *dev = &pdev->dev; | |
585 | struct device_node *dev_np = dev->of_node; | |
586 | struct device_node *cfg_np; | |
587 | struct samsung_pin_group *groups, *grp; | |
588 | struct samsung_pmx_func *functions, *func; | |
589 | unsigned *pin_list; | |
590 | unsigned int npins, grp_cnt, func_idx = 0; | |
591 | char *gname, *fname; | |
592 | int ret; | |
593 | ||
594 | grp_cnt = of_get_child_count(dev_np); | |
595 | if (!grp_cnt) | |
596 | return -EINVAL; | |
597 | ||
598 | groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL); | |
599 | if (!groups) { | |
600 | dev_err(dev, "failed allocate memory for ping group list\n"); | |
601 | return -EINVAL; | |
602 | } | |
603 | grp = groups; | |
604 | ||
605 | functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL); | |
606 | if (!functions) { | |
607 | dev_err(dev, "failed to allocate memory for function list\n"); | |
608 | return -EINVAL; | |
609 | } | |
610 | func = functions; | |
611 | ||
612 | /* | |
613 | * Iterate over all the child nodes of the pin controller node | |
614 | * and create pin groups and pin function lists. | |
615 | */ | |
616 | for_each_child_of_node(dev_np, cfg_np) { | |
617 | u32 function; | |
724e56a4 | 618 | if (!of_find_property(cfg_np, "samsung,pins", NULL)) |
30574f0d TA |
619 | continue; |
620 | ||
621 | ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np, | |
622 | &drvdata->pctl, &pin_list, &npins); | |
623 | if (ret) | |
624 | return ret; | |
625 | ||
626 | /* derive pin group name from the node name */ | |
627 | gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN, | |
628 | GFP_KERNEL); | |
629 | if (!gname) { | |
630 | dev_err(dev, "failed to alloc memory for group name\n"); | |
631 | return -ENOMEM; | |
632 | } | |
633 | sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX); | |
634 | ||
635 | grp->name = gname; | |
636 | grp->pins = pin_list; | |
637 | grp->num_pins = npins; | |
638 | of_property_read_u32(cfg_np, "samsung,pin-function", &function); | |
639 | grp->func = function; | |
640 | grp++; | |
641 | ||
642 | if (!of_find_property(cfg_np, "samsung,pin-function", NULL)) | |
643 | continue; | |
644 | ||
645 | /* derive function name from the node name */ | |
646 | fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN, | |
647 | GFP_KERNEL); | |
648 | if (!fname) { | |
649 | dev_err(dev, "failed to alloc memory for func name\n"); | |
650 | return -ENOMEM; | |
651 | } | |
652 | sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX); | |
653 | ||
654 | func->name = fname; | |
655 | func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL); | |
656 | if (!func->groups) { | |
657 | dev_err(dev, "failed to alloc memory for group list " | |
658 | "in pin function"); | |
659 | return -ENOMEM; | |
660 | } | |
661 | func->groups[0] = gname; | |
662 | func->num_groups = 1; | |
663 | func++; | |
664 | func_idx++; | |
665 | } | |
666 | ||
667 | drvdata->pin_groups = groups; | |
668 | drvdata->nr_groups = grp_cnt; | |
669 | drvdata->pmx_functions = functions; | |
670 | drvdata->nr_functions = func_idx; | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | /* register the pinctrl interface with the pinctrl subsystem */ | |
676 | static int __init samsung_pinctrl_register(struct platform_device *pdev, | |
677 | struct samsung_pinctrl_drv_data *drvdata) | |
678 | { | |
679 | struct pinctrl_desc *ctrldesc = &drvdata->pctl; | |
680 | struct pinctrl_pin_desc *pindesc, *pdesc; | |
681 | struct samsung_pin_bank *pin_bank; | |
682 | char *pin_names; | |
683 | int pin, bank, ret; | |
684 | ||
685 | ctrldesc->name = "samsung-pinctrl"; | |
686 | ctrldesc->owner = THIS_MODULE; | |
687 | ctrldesc->pctlops = &samsung_pctrl_ops; | |
688 | ctrldesc->pmxops = &samsung_pinmux_ops; | |
689 | ctrldesc->confops = &samsung_pinconf_ops; | |
690 | ||
691 | pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) * | |
692 | drvdata->ctrl->nr_pins, GFP_KERNEL); | |
693 | if (!pindesc) { | |
694 | dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n"); | |
695 | return -ENOMEM; | |
696 | } | |
697 | ctrldesc->pins = pindesc; | |
698 | ctrldesc->npins = drvdata->ctrl->nr_pins; | |
699 | ctrldesc->npins = drvdata->ctrl->nr_pins; | |
700 | ||
701 | /* dynamically populate the pin number and pin name for pindesc */ | |
702 | for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++) | |
703 | pdesc->number = pin + drvdata->ctrl->base; | |
704 | ||
705 | /* | |
706 | * allocate space for storing the dynamically generated names for all | |
707 | * the pins which belong to this pin-controller. | |
708 | */ | |
709 | pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH * | |
710 | drvdata->ctrl->nr_pins, GFP_KERNEL); | |
711 | if (!pin_names) { | |
712 | dev_err(&pdev->dev, "mem alloc for pin names failed\n"); | |
713 | return -ENOMEM; | |
714 | } | |
715 | ||
716 | /* for each pin, the name of the pin is pin-bank name + pin number */ | |
717 | for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) { | |
718 | pin_bank = &drvdata->ctrl->pin_banks[bank]; | |
719 | for (pin = 0; pin < pin_bank->nr_pins; pin++) { | |
720 | sprintf(pin_names, "%s-%d", pin_bank->name, pin); | |
721 | pdesc = pindesc + pin_bank->pin_base + pin; | |
722 | pdesc->name = pin_names; | |
723 | pin_names += PIN_NAME_LENGTH; | |
724 | } | |
725 | } | |
726 | ||
727 | drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata); | |
728 | if (!drvdata->pctl_dev) { | |
729 | dev_err(&pdev->dev, "could not register pinctrl driver\n"); | |
730 | return -EINVAL; | |
731 | } | |
732 | ||
d3a7b9e3 TF |
733 | for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) { |
734 | pin_bank = &drvdata->ctrl->pin_banks[bank]; | |
735 | pin_bank->grange.name = pin_bank->name; | |
736 | pin_bank->grange.id = bank; | |
737 | pin_bank->grange.pin_base = pin_bank->pin_base; | |
738 | pin_bank->grange.base = pin_bank->gpio_chip.base; | |
739 | pin_bank->grange.npins = pin_bank->gpio_chip.ngpio; | |
740 | pin_bank->grange.gc = &pin_bank->gpio_chip; | |
741 | pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange); | |
742 | } | |
30574f0d TA |
743 | |
744 | ret = samsung_pinctrl_parse_dt(pdev, drvdata); | |
745 | if (ret) { | |
746 | pinctrl_unregister(drvdata->pctl_dev); | |
747 | return ret; | |
748 | } | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
d3a7b9e3 TF |
753 | static const struct gpio_chip samsung_gpiolib_chip = { |
754 | .set = samsung_gpio_set, | |
755 | .get = samsung_gpio_get, | |
756 | .direction_input = samsung_gpio_direction_input, | |
757 | .direction_output = samsung_gpio_direction_output, | |
758 | .owner = THIS_MODULE, | |
759 | }; | |
760 | ||
30574f0d TA |
761 | /* register the gpiolib interface with the gpiolib subsystem */ |
762 | static int __init samsung_gpiolib_register(struct platform_device *pdev, | |
763 | struct samsung_pinctrl_drv_data *drvdata) | |
764 | { | |
d3a7b9e3 TF |
765 | struct samsung_pin_ctrl *ctrl = drvdata->ctrl; |
766 | struct samsung_pin_bank *bank = ctrl->pin_banks; | |
30574f0d TA |
767 | struct gpio_chip *gc; |
768 | int ret; | |
d3a7b9e3 TF |
769 | int i; |
770 | ||
771 | for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { | |
772 | bank->gpio_chip = samsung_gpiolib_chip; | |
773 | ||
774 | gc = &bank->gpio_chip; | |
775 | gc->base = ctrl->base + bank->pin_base; | |
776 | gc->ngpio = bank->nr_pins; | |
777 | gc->dev = &pdev->dev; | |
778 | gc->of_node = bank->of_node; | |
779 | gc->label = bank->name; | |
780 | ||
781 | ret = gpiochip_add(gc); | |
782 | if (ret) { | |
783 | dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n", | |
784 | gc->label, ret); | |
785 | goto fail; | |
786 | } | |
30574f0d TA |
787 | } |
788 | ||
789 | return 0; | |
d3a7b9e3 TF |
790 | |
791 | fail: | |
792 | for (--i, --bank; i >= 0; --i, --bank) | |
793 | if (gpiochip_remove(&bank->gpio_chip)) | |
794 | dev_err(&pdev->dev, "gpio chip %s remove failed\n", | |
795 | bank->gpio_chip.label); | |
796 | return ret; | |
30574f0d TA |
797 | } |
798 | ||
799 | /* unregister the gpiolib interface with the gpiolib subsystem */ | |
800 | static int __init samsung_gpiolib_unregister(struct platform_device *pdev, | |
801 | struct samsung_pinctrl_drv_data *drvdata) | |
802 | { | |
d3a7b9e3 TF |
803 | struct samsung_pin_ctrl *ctrl = drvdata->ctrl; |
804 | struct samsung_pin_bank *bank = ctrl->pin_banks; | |
805 | int ret = 0; | |
806 | int i; | |
807 | ||
808 | for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank) | |
809 | ret = gpiochip_remove(&bank->gpio_chip); | |
810 | ||
811 | if (ret) | |
30574f0d | 812 | dev_err(&pdev->dev, "gpio chip remove failed\n"); |
d3a7b9e3 TF |
813 | |
814 | return ret; | |
30574f0d TA |
815 | } |
816 | ||
817 | static const struct of_device_id samsung_pinctrl_dt_match[]; | |
818 | ||
819 | /* retrieve the soc specific data */ | |
2f0253ff | 820 | static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data( |
6defe9a0 | 821 | struct samsung_pinctrl_drv_data *d, |
30574f0d TA |
822 | struct platform_device *pdev) |
823 | { | |
824 | int id; | |
825 | const struct of_device_id *match; | |
6defe9a0 | 826 | struct device_node *node = pdev->dev.of_node; |
ab663789 | 827 | struct device_node *np; |
40ba6227 TF |
828 | struct samsung_pin_ctrl *ctrl; |
829 | struct samsung_pin_bank *bank; | |
830 | int i; | |
30574f0d | 831 | |
6defe9a0 | 832 | id = of_alias_get_id(node, "pinctrl"); |
30574f0d TA |
833 | if (id < 0) { |
834 | dev_err(&pdev->dev, "failed to get alias id\n"); | |
835 | return NULL; | |
836 | } | |
837 | match = of_match_node(samsung_pinctrl_dt_match, node); | |
40ba6227 TF |
838 | ctrl = (struct samsung_pin_ctrl *)match->data + id; |
839 | ||
840 | bank = ctrl->pin_banks; | |
841 | for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { | |
6defe9a0 | 842 | bank->drvdata = d; |
40ba6227 TF |
843 | bank->pin_base = ctrl->nr_pins; |
844 | ctrl->nr_pins += bank->nr_pins; | |
40ba6227 TF |
845 | } |
846 | ||
ab663789 TF |
847 | for_each_child_of_node(node, np) { |
848 | if (!of_find_property(np, "gpio-controller", NULL)) | |
849 | continue; | |
850 | bank = ctrl->pin_banks; | |
851 | for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { | |
852 | if (!strcmp(bank->name, np->name)) { | |
853 | bank->of_node = np; | |
854 | break; | |
855 | } | |
856 | } | |
857 | } | |
858 | ||
40ba6227 TF |
859 | ctrl->base = pin_base; |
860 | pin_base += ctrl->nr_pins; | |
861 | ||
862 | return ctrl; | |
30574f0d TA |
863 | } |
864 | ||
865 | static int __devinit samsung_pinctrl_probe(struct platform_device *pdev) | |
866 | { | |
867 | struct samsung_pinctrl_drv_data *drvdata; | |
868 | struct device *dev = &pdev->dev; | |
869 | struct samsung_pin_ctrl *ctrl; | |
870 | struct resource *res; | |
871 | int ret; | |
872 | ||
873 | if (!dev->of_node) { | |
874 | dev_err(dev, "device tree node not found\n"); | |
875 | return -ENODEV; | |
876 | } | |
877 | ||
30574f0d TA |
878 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
879 | if (!drvdata) { | |
880 | dev_err(dev, "failed to allocate memory for driver's " | |
881 | "private data\n"); | |
882 | return -ENOMEM; | |
883 | } | |
6defe9a0 TF |
884 | |
885 | ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev); | |
886 | if (!ctrl) { | |
887 | dev_err(&pdev->dev, "driver data not available\n"); | |
888 | return -EINVAL; | |
889 | } | |
30574f0d TA |
890 | drvdata->ctrl = ctrl; |
891 | drvdata->dev = dev; | |
892 | ||
893 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
894 | if (!res) { | |
895 | dev_err(dev, "cannot find IO resource\n"); | |
896 | return -ENOENT; | |
897 | } | |
898 | ||
899 | drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res); | |
900 | if (!drvdata->virt_base) { | |
901 | dev_err(dev, "ioremap failed\n"); | |
902 | return -ENODEV; | |
903 | } | |
904 | ||
905 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
906 | if (res) | |
907 | drvdata->irq = res->start; | |
908 | ||
909 | ret = samsung_gpiolib_register(pdev, drvdata); | |
910 | if (ret) | |
911 | return ret; | |
912 | ||
913 | ret = samsung_pinctrl_register(pdev, drvdata); | |
914 | if (ret) { | |
915 | samsung_gpiolib_unregister(pdev, drvdata); | |
916 | return ret; | |
917 | } | |
918 | ||
919 | if (ctrl->eint_gpio_init) | |
920 | ctrl->eint_gpio_init(drvdata); | |
921 | if (ctrl->eint_wkup_init) | |
922 | ctrl->eint_wkup_init(drvdata); | |
923 | ||
924 | platform_set_drvdata(pdev, drvdata); | |
925 | return 0; | |
926 | } | |
927 | ||
928 | static const struct of_device_id samsung_pinctrl_dt_match[] = { | |
929 | { .compatible = "samsung,pinctrl-exynos4210", | |
930 | .data = (void *)exynos4210_pin_ctrl }, | |
931 | {}, | |
932 | }; | |
933 | MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match); | |
934 | ||
935 | static struct platform_driver samsung_pinctrl_driver = { | |
936 | .probe = samsung_pinctrl_probe, | |
937 | .driver = { | |
938 | .name = "samsung-pinctrl", | |
939 | .owner = THIS_MODULE, | |
940 | .of_match_table = of_match_ptr(samsung_pinctrl_dt_match), | |
941 | }, | |
942 | }; | |
943 | ||
944 | static int __init samsung_pinctrl_drv_register(void) | |
945 | { | |
946 | return platform_driver_register(&samsung_pinctrl_driver); | |
947 | } | |
948 | postcore_initcall(samsung_pinctrl_drv_register); | |
949 | ||
950 | static void __exit samsung_pinctrl_drv_unregister(void) | |
951 | { | |
952 | platform_driver_unregister(&samsung_pinctrl_driver); | |
953 | } | |
954 | module_exit(samsung_pinctrl_drv_unregister); | |
955 | ||
956 | MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); | |
957 | MODULE_DESCRIPTION("Samsung pinctrl driver"); | |
958 | MODULE_LICENSE("GPL v2"); |