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