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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 | ||
49 | /* check if the selector is a valid pin group selector */ | |
50 | static int samsung_get_group_count(struct pinctrl_dev *pctldev) | |
51 | { | |
52 | struct samsung_pinctrl_drv_data *drvdata; | |
53 | ||
54 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
55 | return drvdata->nr_groups; | |
56 | } | |
57 | ||
58 | /* return the name of the group selected by the group selector */ | |
59 | static const char *samsung_get_group_name(struct pinctrl_dev *pctldev, | |
60 | unsigned selector) | |
61 | { | |
62 | struct samsung_pinctrl_drv_data *drvdata; | |
63 | ||
64 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
65 | return drvdata->pin_groups[selector].name; | |
66 | } | |
67 | ||
68 | /* return the pin numbers associated with the specified group */ | |
69 | static int samsung_get_group_pins(struct pinctrl_dev *pctldev, | |
70 | unsigned selector, const unsigned **pins, unsigned *num_pins) | |
71 | { | |
72 | struct samsung_pinctrl_drv_data *drvdata; | |
73 | ||
74 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
75 | *pins = drvdata->pin_groups[selector].pins; | |
76 | *num_pins = drvdata->pin_groups[selector].num_pins; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /* create pinctrl_map entries by parsing device tree nodes */ | |
81 | static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev, | |
82 | struct device_node *np, struct pinctrl_map **maps, | |
83 | unsigned *nmaps) | |
84 | { | |
85 | struct device *dev = pctldev->dev; | |
86 | struct pinctrl_map *map; | |
87 | unsigned long *cfg = NULL; | |
88 | char *gname, *fname; | |
89 | int cfg_cnt = 0, map_cnt = 0, idx = 0; | |
90 | ||
91 | /* count the number of config options specfied in the node */ | |
92 | for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) { | |
93 | if (of_find_property(np, pcfgs[idx].prop_cfg, NULL)) | |
94 | cfg_cnt++; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Find out the number of map entries to create. All the config options | |
99 | * can be accomadated into a single config map entry. | |
100 | */ | |
101 | if (cfg_cnt) | |
102 | map_cnt = 1; | |
103 | if (of_find_property(np, "samsung,pin-function", NULL)) | |
104 | map_cnt++; | |
105 | if (!map_cnt) { | |
106 | dev_err(dev, "node %s does not have either config or function " | |
107 | "configurations\n", np->name); | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | /* Allocate memory for pin-map entries */ | |
112 | map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL); | |
113 | if (!map) { | |
114 | dev_err(dev, "could not alloc memory for pin-maps\n"); | |
115 | return -ENOMEM; | |
116 | } | |
117 | *nmaps = 0; | |
118 | ||
119 | /* | |
120 | * Allocate memory for pin group name. The pin group name is derived | |
121 | * from the node name from which these map entries are be created. | |
122 | */ | |
123 | gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL); | |
124 | if (!gname) { | |
125 | dev_err(dev, "failed to alloc memory for group name\n"); | |
126 | goto free_map; | |
127 | } | |
128 | sprintf(gname, "%s%s", np->name, GROUP_SUFFIX); | |
129 | ||
130 | /* | |
131 | * don't have config options? then skip over to creating function | |
132 | * map entries. | |
133 | */ | |
134 | if (!cfg_cnt) | |
135 | goto skip_cfgs; | |
136 | ||
137 | /* Allocate memory for config entries */ | |
138 | cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL); | |
139 | if (!cfg) { | |
140 | dev_err(dev, "failed to alloc memory for configs\n"); | |
141 | goto free_gname; | |
142 | } | |
143 | ||
144 | /* Prepare a list of config settings */ | |
145 | for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) { | |
146 | u32 value; | |
147 | if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value)) | |
148 | cfg[cfg_cnt++] = | |
149 | PINCFG_PACK(pcfgs[idx].cfg_type, value); | |
150 | } | |
151 | ||
152 | /* create the config map entry */ | |
153 | map[*nmaps].data.configs.group_or_pin = gname; | |
154 | map[*nmaps].data.configs.configs = cfg; | |
155 | map[*nmaps].data.configs.num_configs = cfg_cnt; | |
156 | map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP; | |
157 | *nmaps += 1; | |
158 | ||
159 | skip_cfgs: | |
160 | /* create the function map entry */ | |
161 | if (of_find_property(np, "samsung,pin-function", NULL)) { | |
162 | fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL); | |
163 | if (!fname) { | |
164 | dev_err(dev, "failed to alloc memory for func name\n"); | |
165 | goto free_cfg; | |
166 | } | |
167 | sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX); | |
168 | ||
169 | map[*nmaps].data.mux.group = gname; | |
170 | map[*nmaps].data.mux.function = fname; | |
171 | map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP; | |
172 | *nmaps += 1; | |
173 | } | |
174 | ||
175 | *maps = map; | |
176 | return 0; | |
177 | ||
178 | free_cfg: | |
179 | kfree(cfg); | |
180 | free_gname: | |
181 | kfree(gname); | |
182 | free_map: | |
183 | kfree(map); | |
184 | return -ENOMEM; | |
185 | } | |
186 | ||
187 | /* free the memory allocated to hold the pin-map table */ | |
188 | static void samsung_dt_free_map(struct pinctrl_dev *pctldev, | |
189 | struct pinctrl_map *map, unsigned num_maps) | |
190 | { | |
191 | int idx; | |
192 | ||
193 | for (idx = 0; idx < num_maps; idx++) { | |
194 | if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) { | |
195 | kfree(map[idx].data.mux.function); | |
196 | if (!idx) | |
197 | kfree(map[idx].data.mux.group); | |
198 | } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) { | |
199 | kfree(map[idx].data.configs.configs); | |
200 | if (!idx) | |
201 | kfree(map[idx].data.configs.group_or_pin); | |
202 | } | |
203 | }; | |
204 | ||
205 | kfree(map); | |
206 | } | |
207 | ||
208 | /* list of pinctrl callbacks for the pinctrl core */ | |
209 | static struct pinctrl_ops samsung_pctrl_ops = { | |
210 | .get_groups_count = samsung_get_group_count, | |
211 | .get_group_name = samsung_get_group_name, | |
212 | .get_group_pins = samsung_get_group_pins, | |
213 | .dt_node_to_map = samsung_dt_node_to_map, | |
214 | .dt_free_map = samsung_dt_free_map, | |
215 | }; | |
216 | ||
217 | /* check if the selector is a valid pin function selector */ | |
218 | static int samsung_get_functions_count(struct pinctrl_dev *pctldev) | |
219 | { | |
220 | struct samsung_pinctrl_drv_data *drvdata; | |
221 | ||
222 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
223 | return drvdata->nr_functions; | |
224 | } | |
225 | ||
226 | /* return the name of the pin function specified */ | |
227 | static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev, | |
228 | unsigned selector) | |
229 | { | |
230 | struct samsung_pinctrl_drv_data *drvdata; | |
231 | ||
232 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
233 | return drvdata->pmx_functions[selector].name; | |
234 | } | |
235 | ||
236 | /* return the groups associated for the specified function selector */ | |
237 | static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev, | |
238 | unsigned selector, const char * const **groups, | |
239 | unsigned * const num_groups) | |
240 | { | |
241 | struct samsung_pinctrl_drv_data *drvdata; | |
242 | ||
243 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
244 | *groups = drvdata->pmx_functions[selector].groups; | |
245 | *num_groups = drvdata->pmx_functions[selector].num_groups; | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* | |
250 | * given a pin number that is local to a pin controller, find out the pin bank | |
251 | * and the register base of the pin bank. | |
252 | */ | |
253 | static void pin_to_reg_bank(struct gpio_chip *gc, unsigned pin, | |
254 | void __iomem **reg, u32 *offset, | |
255 | struct samsung_pin_bank **bank) | |
256 | { | |
257 | struct samsung_pinctrl_drv_data *drvdata; | |
258 | struct samsung_pin_bank *b; | |
259 | ||
260 | drvdata = dev_get_drvdata(gc->dev); | |
261 | b = drvdata->ctrl->pin_banks; | |
262 | ||
263 | while ((pin >= b->pin_base) && | |
264 | ((b->pin_base + b->nr_pins - 1) < pin)) | |
265 | b++; | |
266 | ||
267 | *reg = drvdata->virt_base + b->pctl_offset; | |
268 | *offset = pin - b->pin_base; | |
269 | if (bank) | |
270 | *bank = b; | |
271 | ||
272 | /* some banks have two config registers in a single bank */ | |
273 | if (*offset * b->func_width > BITS_PER_LONG) | |
274 | *reg += 4; | |
275 | } | |
276 | ||
277 | /* enable or disable a pinmux function */ | |
278 | static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector, | |
279 | unsigned group, bool enable) | |
280 | { | |
281 | struct samsung_pinctrl_drv_data *drvdata; | |
282 | const unsigned int *pins; | |
283 | struct samsung_pin_bank *bank; | |
284 | void __iomem *reg; | |
285 | u32 mask, shift, data, pin_offset, cnt; | |
286 | ||
287 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
288 | pins = drvdata->pin_groups[group].pins; | |
289 | ||
290 | /* | |
291 | * for each pin in the pin group selected, program the correspoding pin | |
292 | * pin function number in the config register. | |
293 | */ | |
294 | for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) { | |
295 | pin_to_reg_bank(drvdata->gc, pins[cnt] - drvdata->ctrl->base, | |
296 | ®, &pin_offset, &bank); | |
297 | mask = (1 << bank->func_width) - 1; | |
298 | shift = pin_offset * bank->func_width; | |
299 | ||
300 | data = readl(reg); | |
301 | data &= ~(mask << shift); | |
302 | if (enable) | |
303 | data |= drvdata->pin_groups[group].func << shift; | |
304 | writel(data, reg); | |
305 | } | |
306 | } | |
307 | ||
308 | /* enable a specified pinmux by writing to registers */ | |
309 | static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector, | |
310 | unsigned group) | |
311 | { | |
312 | samsung_pinmux_setup(pctldev, selector, group, true); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /* disable a specified pinmux by writing to registers */ | |
317 | static void samsung_pinmux_disable(struct pinctrl_dev *pctldev, | |
318 | unsigned selector, unsigned group) | |
319 | { | |
320 | samsung_pinmux_setup(pctldev, selector, group, false); | |
321 | } | |
322 | ||
323 | /* | |
324 | * The calls to gpio_direction_output() and gpio_direction_input() | |
325 | * leads to this function call (via the pinctrl_gpio_direction_{input|output}() | |
326 | * function called from the gpiolib interface). | |
327 | */ | |
328 | static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev, | |
329 | struct pinctrl_gpio_range *range, unsigned offset, bool input) | |
330 | { | |
331 | struct samsung_pin_bank *bank; | |
332 | void __iomem *reg; | |
333 | u32 data, pin_offset, mask, shift; | |
334 | ||
335 | pin_to_reg_bank(range->gc, offset, ®, &pin_offset, &bank); | |
336 | mask = (1 << bank->func_width) - 1; | |
337 | shift = pin_offset * bank->func_width; | |
338 | ||
339 | data = readl(reg); | |
340 | data &= ~(mask << shift); | |
341 | if (!input) | |
342 | data |= FUNC_OUTPUT << shift; | |
343 | writel(data, reg); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* list of pinmux callbacks for the pinmux vertical in pinctrl core */ | |
348 | static struct pinmux_ops samsung_pinmux_ops = { | |
349 | .get_functions_count = samsung_get_functions_count, | |
350 | .get_function_name = samsung_pinmux_get_fname, | |
351 | .get_function_groups = samsung_pinmux_get_groups, | |
352 | .enable = samsung_pinmux_enable, | |
353 | .disable = samsung_pinmux_disable, | |
354 | .gpio_set_direction = samsung_pinmux_gpio_set_direction, | |
355 | }; | |
356 | ||
357 | /* set or get the pin config settings for a specified pin */ | |
358 | static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin, | |
359 | unsigned long *config, bool set) | |
360 | { | |
361 | struct samsung_pinctrl_drv_data *drvdata; | |
362 | struct samsung_pin_bank *bank; | |
363 | void __iomem *reg_base; | |
364 | enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config); | |
365 | u32 data, width, pin_offset, mask, shift; | |
366 | u32 cfg_value, cfg_reg; | |
367 | ||
368 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
369 | pin_to_reg_bank(drvdata->gc, pin - drvdata->ctrl->base, ®_base, | |
370 | &pin_offset, &bank); | |
371 | ||
372 | switch (cfg_type) { | |
373 | case PINCFG_TYPE_PUD: | |
374 | width = bank->pud_width; | |
375 | cfg_reg = PUD_REG; | |
376 | break; | |
377 | case PINCFG_TYPE_DRV: | |
378 | width = bank->drv_width; | |
379 | cfg_reg = DRV_REG; | |
380 | break; | |
381 | case PINCFG_TYPE_CON_PDN: | |
382 | width = bank->conpdn_width; | |
383 | cfg_reg = CONPDN_REG; | |
384 | break; | |
385 | case PINCFG_TYPE_PUD_PDN: | |
386 | width = bank->pudpdn_width; | |
387 | cfg_reg = PUDPDN_REG; | |
388 | break; | |
389 | default: | |
390 | WARN_ON(1); | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | mask = (1 << width) - 1; | |
395 | shift = pin_offset * width; | |
396 | data = readl(reg_base + cfg_reg); | |
397 | ||
398 | if (set) { | |
399 | cfg_value = PINCFG_UNPACK_VALUE(*config); | |
400 | data &= ~(mask << shift); | |
401 | data |= (cfg_value << shift); | |
402 | writel(data, reg_base + cfg_reg); | |
403 | } else { | |
404 | data >>= shift; | |
405 | data &= mask; | |
406 | *config = PINCFG_PACK(cfg_type, data); | |
407 | } | |
408 | return 0; | |
409 | } | |
410 | ||
411 | /* set the pin config settings for a specified pin */ | |
412 | static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, | |
413 | unsigned long config) | |
414 | { | |
415 | return samsung_pinconf_rw(pctldev, pin, &config, true); | |
416 | } | |
417 | ||
418 | /* get the pin config settings for a specified pin */ | |
419 | static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, | |
420 | unsigned long *config) | |
421 | { | |
422 | return samsung_pinconf_rw(pctldev, pin, config, false); | |
423 | } | |
424 | ||
425 | /* set the pin config settings for a specified pin group */ | |
426 | static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev, | |
427 | unsigned group, unsigned long config) | |
428 | { | |
429 | struct samsung_pinctrl_drv_data *drvdata; | |
430 | const unsigned int *pins; | |
431 | unsigned int cnt; | |
432 | ||
433 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
434 | pins = drvdata->pin_groups[group].pins; | |
435 | ||
436 | for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) | |
437 | samsung_pinconf_set(pctldev, pins[cnt], config); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | /* get the pin config settings for a specified pin group */ | |
443 | static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev, | |
444 | unsigned int group, unsigned long *config) | |
445 | { | |
446 | struct samsung_pinctrl_drv_data *drvdata; | |
447 | const unsigned int *pins; | |
448 | ||
449 | drvdata = pinctrl_dev_get_drvdata(pctldev); | |
450 | pins = drvdata->pin_groups[group].pins; | |
451 | samsung_pinconf_get(pctldev, pins[0], config); | |
452 | return 0; | |
453 | } | |
454 | ||
455 | /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */ | |
456 | static struct pinconf_ops samsung_pinconf_ops = { | |
457 | .pin_config_get = samsung_pinconf_get, | |
458 | .pin_config_set = samsung_pinconf_set, | |
459 | .pin_config_group_get = samsung_pinconf_group_get, | |
460 | .pin_config_group_set = samsung_pinconf_group_set, | |
461 | }; | |
462 | ||
463 | /* gpiolib gpio_set callback function */ | |
464 | static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value) | |
465 | { | |
466 | void __iomem *reg; | |
467 | u32 pin_offset, data; | |
468 | ||
469 | pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL); | |
470 | data = readl(reg + DAT_REG); | |
471 | data &= ~(1 << pin_offset); | |
472 | if (value) | |
473 | data |= 1 << pin_offset; | |
474 | writel(data, reg + DAT_REG); | |
475 | } | |
476 | ||
477 | /* gpiolib gpio_get callback function */ | |
478 | static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset) | |
479 | { | |
480 | void __iomem *reg; | |
481 | u32 pin_offset, data; | |
482 | ||
483 | pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL); | |
484 | data = readl(reg + DAT_REG); | |
485 | data >>= pin_offset; | |
486 | data &= 1; | |
487 | return data; | |
488 | } | |
489 | ||
490 | /* | |
491 | * gpiolib gpio_direction_input callback function. The setting of the pin | |
492 | * mux function as 'gpio input' will be handled by the pinctrl susbsystem | |
493 | * interface. | |
494 | */ | |
495 | static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset) | |
496 | { | |
497 | return pinctrl_gpio_direction_input(gc->base + offset); | |
498 | } | |
499 | ||
500 | /* | |
501 | * gpiolib gpio_direction_output callback function. The setting of the pin | |
502 | * mux function as 'gpio output' will be handled by the pinctrl susbsystem | |
503 | * interface. | |
504 | */ | |
505 | static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset, | |
506 | int value) | |
507 | { | |
508 | samsung_gpio_set(gc, offset, value); | |
509 | return pinctrl_gpio_direction_output(gc->base + offset); | |
510 | } | |
511 | ||
512 | /* | |
513 | * Parse the pin names listed in the 'samsung,pins' property and convert it | |
514 | * into a list of gpio numbers are create a pin group from it. | |
515 | */ | |
47dbec59 | 516 | static int __devinit samsung_pinctrl_parse_dt_pins(struct platform_device *pdev, |
30574f0d TA |
517 | struct device_node *cfg_np, struct pinctrl_desc *pctl, |
518 | unsigned int **pin_list, unsigned int *npins) | |
519 | { | |
520 | struct device *dev = &pdev->dev; | |
521 | struct property *prop; | |
522 | struct pinctrl_pin_desc const *pdesc = pctl->pins; | |
523 | unsigned int idx = 0, cnt; | |
524 | const char *pin_name; | |
525 | ||
526 | *npins = of_property_count_strings(cfg_np, "samsung,pins"); | |
527 | if (*npins < 0) { | |
528 | dev_err(dev, "invalid pin list in %s node", cfg_np->name); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL); | |
533 | if (!*pin_list) { | |
534 | dev_err(dev, "failed to allocate memory for pin list\n"); | |
535 | return -ENOMEM; | |
536 | } | |
537 | ||
538 | of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) { | |
539 | for (cnt = 0; cnt < pctl->npins; cnt++) { | |
540 | if (pdesc[cnt].name) { | |
541 | if (!strcmp(pin_name, pdesc[cnt].name)) { | |
542 | (*pin_list)[idx++] = pdesc[cnt].number; | |
543 | break; | |
544 | } | |
545 | } | |
546 | } | |
547 | if (cnt == pctl->npins) { | |
548 | dev_err(dev, "pin %s not valid in %s node\n", | |
549 | pin_name, cfg_np->name); | |
550 | devm_kfree(dev, *pin_list); | |
551 | return -EINVAL; | |
552 | } | |
553 | } | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | /* | |
559 | * Parse the information about all the available pin groups and pin functions | |
560 | * from device node of the pin-controller. A pin group is formed with all | |
561 | * the pins listed in the "samsung,pins" property. | |
562 | */ | |
47dbec59 | 563 | static int __devinit samsung_pinctrl_parse_dt(struct platform_device *pdev, |
30574f0d TA |
564 | struct samsung_pinctrl_drv_data *drvdata) |
565 | { | |
566 | struct device *dev = &pdev->dev; | |
567 | struct device_node *dev_np = dev->of_node; | |
568 | struct device_node *cfg_np; | |
569 | struct samsung_pin_group *groups, *grp; | |
570 | struct samsung_pmx_func *functions, *func; | |
571 | unsigned *pin_list; | |
572 | unsigned int npins, grp_cnt, func_idx = 0; | |
573 | char *gname, *fname; | |
574 | int ret; | |
575 | ||
576 | grp_cnt = of_get_child_count(dev_np); | |
577 | if (!grp_cnt) | |
578 | return -EINVAL; | |
579 | ||
580 | groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL); | |
581 | if (!groups) { | |
582 | dev_err(dev, "failed allocate memory for ping group list\n"); | |
583 | return -EINVAL; | |
584 | } | |
585 | grp = groups; | |
586 | ||
587 | functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL); | |
588 | if (!functions) { | |
589 | dev_err(dev, "failed to allocate memory for function list\n"); | |
590 | return -EINVAL; | |
591 | } | |
592 | func = functions; | |
593 | ||
594 | /* | |
595 | * Iterate over all the child nodes of the pin controller node | |
596 | * and create pin groups and pin function lists. | |
597 | */ | |
598 | for_each_child_of_node(dev_np, cfg_np) { | |
599 | u32 function; | |
600 | if (of_find_property(cfg_np, "interrupt-controller", NULL)) | |
601 | continue; | |
602 | ||
603 | ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np, | |
604 | &drvdata->pctl, &pin_list, &npins); | |
605 | if (ret) | |
606 | return ret; | |
607 | ||
608 | /* derive pin group name from the node name */ | |
609 | gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN, | |
610 | GFP_KERNEL); | |
611 | if (!gname) { | |
612 | dev_err(dev, "failed to alloc memory for group name\n"); | |
613 | return -ENOMEM; | |
614 | } | |
615 | sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX); | |
616 | ||
617 | grp->name = gname; | |
618 | grp->pins = pin_list; | |
619 | grp->num_pins = npins; | |
620 | of_property_read_u32(cfg_np, "samsung,pin-function", &function); | |
621 | grp->func = function; | |
622 | grp++; | |
623 | ||
624 | if (!of_find_property(cfg_np, "samsung,pin-function", NULL)) | |
625 | continue; | |
626 | ||
627 | /* derive function name from the node name */ | |
628 | fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN, | |
629 | GFP_KERNEL); | |
630 | if (!fname) { | |
631 | dev_err(dev, "failed to alloc memory for func name\n"); | |
632 | return -ENOMEM; | |
633 | } | |
634 | sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX); | |
635 | ||
636 | func->name = fname; | |
637 | func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL); | |
638 | if (!func->groups) { | |
639 | dev_err(dev, "failed to alloc memory for group list " | |
640 | "in pin function"); | |
641 | return -ENOMEM; | |
642 | } | |
643 | func->groups[0] = gname; | |
644 | func->num_groups = 1; | |
645 | func++; | |
646 | func_idx++; | |
647 | } | |
648 | ||
649 | drvdata->pin_groups = groups; | |
650 | drvdata->nr_groups = grp_cnt; | |
651 | drvdata->pmx_functions = functions; | |
652 | drvdata->nr_functions = func_idx; | |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
657 | /* register the pinctrl interface with the pinctrl subsystem */ | |
47dbec59 | 658 | static int __devinit samsung_pinctrl_register(struct platform_device *pdev, |
30574f0d TA |
659 | struct samsung_pinctrl_drv_data *drvdata) |
660 | { | |
661 | struct pinctrl_desc *ctrldesc = &drvdata->pctl; | |
662 | struct pinctrl_pin_desc *pindesc, *pdesc; | |
663 | struct samsung_pin_bank *pin_bank; | |
664 | char *pin_names; | |
665 | int pin, bank, ret; | |
666 | ||
667 | ctrldesc->name = "samsung-pinctrl"; | |
668 | ctrldesc->owner = THIS_MODULE; | |
669 | ctrldesc->pctlops = &samsung_pctrl_ops; | |
670 | ctrldesc->pmxops = &samsung_pinmux_ops; | |
671 | ctrldesc->confops = &samsung_pinconf_ops; | |
672 | ||
673 | pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) * | |
674 | drvdata->ctrl->nr_pins, GFP_KERNEL); | |
675 | if (!pindesc) { | |
676 | dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n"); | |
677 | return -ENOMEM; | |
678 | } | |
679 | ctrldesc->pins = pindesc; | |
680 | ctrldesc->npins = drvdata->ctrl->nr_pins; | |
681 | ctrldesc->npins = drvdata->ctrl->nr_pins; | |
682 | ||
683 | /* dynamically populate the pin number and pin name for pindesc */ | |
684 | for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++) | |
685 | pdesc->number = pin + drvdata->ctrl->base; | |
686 | ||
687 | /* | |
688 | * allocate space for storing the dynamically generated names for all | |
689 | * the pins which belong to this pin-controller. | |
690 | */ | |
691 | pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH * | |
692 | drvdata->ctrl->nr_pins, GFP_KERNEL); | |
693 | if (!pin_names) { | |
694 | dev_err(&pdev->dev, "mem alloc for pin names failed\n"); | |
695 | return -ENOMEM; | |
696 | } | |
697 | ||
698 | /* for each pin, the name of the pin is pin-bank name + pin number */ | |
699 | for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) { | |
700 | pin_bank = &drvdata->ctrl->pin_banks[bank]; | |
701 | for (pin = 0; pin < pin_bank->nr_pins; pin++) { | |
702 | sprintf(pin_names, "%s-%d", pin_bank->name, pin); | |
703 | pdesc = pindesc + pin_bank->pin_base + pin; | |
704 | pdesc->name = pin_names; | |
705 | pin_names += PIN_NAME_LENGTH; | |
706 | } | |
707 | } | |
708 | ||
709 | drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata); | |
710 | if (!drvdata->pctl_dev) { | |
711 | dev_err(&pdev->dev, "could not register pinctrl driver\n"); | |
712 | return -EINVAL; | |
713 | } | |
714 | ||
715 | drvdata->grange.name = "samsung-pctrl-gpio-range"; | |
716 | drvdata->grange.id = 0; | |
717 | drvdata->grange.base = drvdata->ctrl->base; | |
718 | drvdata->grange.npins = drvdata->ctrl->nr_pins; | |
719 | drvdata->grange.gc = drvdata->gc; | |
720 | pinctrl_add_gpio_range(drvdata->pctl_dev, &drvdata->grange); | |
721 | ||
722 | ret = samsung_pinctrl_parse_dt(pdev, drvdata); | |
723 | if (ret) { | |
724 | pinctrl_unregister(drvdata->pctl_dev); | |
725 | return ret; | |
726 | } | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | /* register the gpiolib interface with the gpiolib subsystem */ | |
47dbec59 | 732 | static int __devinit samsung_gpiolib_register(struct platform_device *pdev, |
30574f0d TA |
733 | struct samsung_pinctrl_drv_data *drvdata) |
734 | { | |
735 | struct gpio_chip *gc; | |
736 | int ret; | |
737 | ||
738 | gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); | |
739 | if (!gc) { | |
740 | dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n"); | |
741 | return -ENOMEM; | |
742 | } | |
743 | ||
744 | drvdata->gc = gc; | |
745 | gc->base = drvdata->ctrl->base; | |
746 | gc->ngpio = drvdata->ctrl->nr_pins; | |
747 | gc->dev = &pdev->dev; | |
748 | gc->set = samsung_gpio_set; | |
749 | gc->get = samsung_gpio_get; | |
750 | gc->direction_input = samsung_gpio_direction_input; | |
751 | gc->direction_output = samsung_gpio_direction_output; | |
752 | gc->label = drvdata->ctrl->label; | |
753 | gc->owner = THIS_MODULE; | |
754 | ret = gpiochip_add(gc); | |
755 | if (ret) { | |
756 | dev_err(&pdev->dev, "failed to register gpio_chip %s, error " | |
757 | "code: %d\n", gc->label, ret); | |
758 | return ret; | |
759 | } | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | /* unregister the gpiolib interface with the gpiolib subsystem */ | |
47dbec59 | 765 | static int __devinit samsung_gpiolib_unregister(struct platform_device *pdev, |
30574f0d TA |
766 | struct samsung_pinctrl_drv_data *drvdata) |
767 | { | |
768 | int ret = gpiochip_remove(drvdata->gc); | |
769 | if (ret) { | |
770 | dev_err(&pdev->dev, "gpio chip remove failed\n"); | |
771 | return ret; | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | ||
776 | static const struct of_device_id samsung_pinctrl_dt_match[]; | |
777 | ||
778 | /* retrieve the soc specific data */ | |
2f0253ff | 779 | static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data( |
30574f0d TA |
780 | struct platform_device *pdev) |
781 | { | |
782 | int id; | |
783 | const struct of_device_id *match; | |
784 | const struct device_node *node = pdev->dev.of_node; | |
785 | ||
786 | id = of_alias_get_id(pdev->dev.of_node, "pinctrl"); | |
787 | if (id < 0) { | |
788 | dev_err(&pdev->dev, "failed to get alias id\n"); | |
789 | return NULL; | |
790 | } | |
791 | match = of_match_node(samsung_pinctrl_dt_match, node); | |
792 | return (struct samsung_pin_ctrl *)match->data + id; | |
793 | } | |
794 | ||
795 | static int __devinit samsung_pinctrl_probe(struct platform_device *pdev) | |
796 | { | |
797 | struct samsung_pinctrl_drv_data *drvdata; | |
798 | struct device *dev = &pdev->dev; | |
799 | struct samsung_pin_ctrl *ctrl; | |
800 | struct resource *res; | |
801 | int ret; | |
802 | ||
803 | if (!dev->of_node) { | |
804 | dev_err(dev, "device tree node not found\n"); | |
805 | return -ENODEV; | |
806 | } | |
807 | ||
808 | ctrl = samsung_pinctrl_get_soc_data(pdev); | |
809 | if (!ctrl) { | |
810 | dev_err(&pdev->dev, "driver data not available\n"); | |
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); | |
815 | if (!drvdata) { | |
816 | dev_err(dev, "failed to allocate memory for driver's " | |
817 | "private data\n"); | |
818 | return -ENOMEM; | |
819 | } | |
820 | drvdata->ctrl = ctrl; | |
821 | drvdata->dev = dev; | |
822 | ||
823 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
824 | if (!res) { | |
825 | dev_err(dev, "cannot find IO resource\n"); | |
826 | return -ENOENT; | |
827 | } | |
828 | ||
829 | drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res); | |
830 | if (!drvdata->virt_base) { | |
831 | dev_err(dev, "ioremap failed\n"); | |
832 | return -ENODEV; | |
833 | } | |
834 | ||
835 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
836 | if (res) | |
837 | drvdata->irq = res->start; | |
838 | ||
839 | ret = samsung_gpiolib_register(pdev, drvdata); | |
840 | if (ret) | |
841 | return ret; | |
842 | ||
843 | ret = samsung_pinctrl_register(pdev, drvdata); | |
844 | if (ret) { | |
845 | samsung_gpiolib_unregister(pdev, drvdata); | |
846 | return ret; | |
847 | } | |
848 | ||
849 | if (ctrl->eint_gpio_init) | |
850 | ctrl->eint_gpio_init(drvdata); | |
851 | if (ctrl->eint_wkup_init) | |
852 | ctrl->eint_wkup_init(drvdata); | |
853 | ||
854 | platform_set_drvdata(pdev, drvdata); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | static const struct of_device_id samsung_pinctrl_dt_match[] = { | |
859 | { .compatible = "samsung,pinctrl-exynos4210", | |
860 | .data = (void *)exynos4210_pin_ctrl }, | |
861 | {}, | |
862 | }; | |
863 | MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match); | |
864 | ||
865 | static struct platform_driver samsung_pinctrl_driver = { | |
866 | .probe = samsung_pinctrl_probe, | |
867 | .driver = { | |
868 | .name = "samsung-pinctrl", | |
869 | .owner = THIS_MODULE, | |
870 | .of_match_table = of_match_ptr(samsung_pinctrl_dt_match), | |
871 | }, | |
872 | }; | |
873 | ||
874 | static int __init samsung_pinctrl_drv_register(void) | |
875 | { | |
876 | return platform_driver_register(&samsung_pinctrl_driver); | |
877 | } | |
878 | postcore_initcall(samsung_pinctrl_drv_register); | |
879 | ||
880 | static void __exit samsung_pinctrl_drv_unregister(void) | |
881 | { | |
882 | platform_driver_unregister(&samsung_pinctrl_driver); | |
883 | } | |
884 | module_exit(samsung_pinctrl_drv_unregister); | |
885 | ||
886 | MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); | |
887 | MODULE_DESCRIPTION("Samsung pinctrl driver"); | |
888 | MODULE_LICENSE("GPL v2"); |