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Merge tag 'pinctrl-v3.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[deliverable/linux.git] / drivers / pinctrl / samsung / pinctrl-samsung.c
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 #include <linux/irqdomain.h>
30 #include <linux/spinlock.h>
31 #include <linux/syscore_ops.h>
32
33 #include "../core.h"
34 #include "pinctrl-samsung.h"
35
36 #define GROUP_SUFFIX "-grp"
37 #define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
38 #define FUNCTION_SUFFIX "-mux"
39 #define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
40
41 /* list of all possible config options supported */
42 static struct pin_config {
43 const char *property;
44 enum pincfg_type param;
45 } cfg_params[] = {
46 { "samsung,pin-pud", PINCFG_TYPE_PUD },
47 { "samsung,pin-drv", PINCFG_TYPE_DRV },
48 { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
49 { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
50 { "samsung,pin-val", PINCFG_TYPE_DAT },
51 };
52
53 /* Global list of devices (struct samsung_pinctrl_drv_data) */
54 static LIST_HEAD(drvdata_list);
55
56 static unsigned int pin_base;
57
58 static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
59 {
60 return container_of(gc, struct samsung_pin_bank, gpio_chip);
61 }
62
63 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
64 {
65 struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
66
67 return pmx->nr_groups;
68 }
69
70 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
71 unsigned group)
72 {
73 struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
74
75 return pmx->pin_groups[group].name;
76 }
77
78 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
79 unsigned group,
80 const unsigned **pins,
81 unsigned *num_pins)
82 {
83 struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
84
85 *pins = pmx->pin_groups[group].pins;
86 *num_pins = pmx->pin_groups[group].num_pins;
87
88 return 0;
89 }
90
91 static int reserve_map(struct device *dev, struct pinctrl_map **map,
92 unsigned *reserved_maps, unsigned *num_maps,
93 unsigned reserve)
94 {
95 unsigned old_num = *reserved_maps;
96 unsigned new_num = *num_maps + reserve;
97 struct pinctrl_map *new_map;
98
99 if (old_num >= new_num)
100 return 0;
101
102 new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
103 if (!new_map) {
104 dev_err(dev, "krealloc(map) failed\n");
105 return -ENOMEM;
106 }
107
108 memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
109
110 *map = new_map;
111 *reserved_maps = new_num;
112
113 return 0;
114 }
115
116 static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
117 unsigned *num_maps, const char *group,
118 const char *function)
119 {
120 if (WARN_ON(*num_maps == *reserved_maps))
121 return -ENOSPC;
122
123 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
124 (*map)[*num_maps].data.mux.group = group;
125 (*map)[*num_maps].data.mux.function = function;
126 (*num_maps)++;
127
128 return 0;
129 }
130
131 static int add_map_configs(struct device *dev, struct pinctrl_map **map,
132 unsigned *reserved_maps, unsigned *num_maps,
133 const char *group, unsigned long *configs,
134 unsigned num_configs)
135 {
136 unsigned long *dup_configs;
137
138 if (WARN_ON(*num_maps == *reserved_maps))
139 return -ENOSPC;
140
141 dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
142 GFP_KERNEL);
143 if (!dup_configs) {
144 dev_err(dev, "kmemdup(configs) failed\n");
145 return -ENOMEM;
146 }
147
148 (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
149 (*map)[*num_maps].data.configs.group_or_pin = group;
150 (*map)[*num_maps].data.configs.configs = dup_configs;
151 (*map)[*num_maps].data.configs.num_configs = num_configs;
152 (*num_maps)++;
153
154 return 0;
155 }
156
157 static int add_config(struct device *dev, unsigned long **configs,
158 unsigned *num_configs, unsigned long config)
159 {
160 unsigned old_num = *num_configs;
161 unsigned new_num = old_num + 1;
162 unsigned long *new_configs;
163
164 new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
165 GFP_KERNEL);
166 if (!new_configs) {
167 dev_err(dev, "krealloc(configs) failed\n");
168 return -ENOMEM;
169 }
170
171 new_configs[old_num] = config;
172
173 *configs = new_configs;
174 *num_configs = new_num;
175
176 return 0;
177 }
178
179 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
180 struct pinctrl_map *map,
181 unsigned num_maps)
182 {
183 int i;
184
185 for (i = 0; i < num_maps; i++)
186 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
187 kfree(map[i].data.configs.configs);
188
189 kfree(map);
190 }
191
192 static int samsung_dt_subnode_to_map(struct samsung_pinctrl_drv_data *drvdata,
193 struct device *dev,
194 struct device_node *np,
195 struct pinctrl_map **map,
196 unsigned *reserved_maps,
197 unsigned *num_maps)
198 {
199 int ret, i;
200 u32 val;
201 unsigned long config;
202 unsigned long *configs = NULL;
203 unsigned num_configs = 0;
204 unsigned reserve;
205 struct property *prop;
206 const char *group;
207 bool has_func = false;
208
209 ret = of_property_read_u32(np, "samsung,pin-function", &val);
210 if (!ret)
211 has_func = true;
212
213 for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
214 ret = of_property_read_u32(np, cfg_params[i].property, &val);
215 if (!ret) {
216 config = PINCFG_PACK(cfg_params[i].param, val);
217 ret = add_config(dev, &configs, &num_configs, config);
218 if (ret < 0)
219 goto exit;
220 /* EINVAL=missing, which is fine since it's optional */
221 } else if (ret != -EINVAL) {
222 dev_err(dev, "could not parse property %s\n",
223 cfg_params[i].property);
224 }
225 }
226
227 reserve = 0;
228 if (has_func)
229 reserve++;
230 if (num_configs)
231 reserve++;
232 ret = of_property_count_strings(np, "samsung,pins");
233 if (ret < 0) {
234 dev_err(dev, "could not parse property samsung,pins\n");
235 goto exit;
236 }
237 reserve *= ret;
238
239 ret = reserve_map(dev, map, reserved_maps, num_maps, reserve);
240 if (ret < 0)
241 goto exit;
242
243 of_property_for_each_string(np, "samsung,pins", prop, group) {
244 if (has_func) {
245 ret = add_map_mux(map, reserved_maps,
246 num_maps, group, np->full_name);
247 if (ret < 0)
248 goto exit;
249 }
250
251 if (num_configs) {
252 ret = add_map_configs(dev, map, reserved_maps,
253 num_maps, group, configs,
254 num_configs);
255 if (ret < 0)
256 goto exit;
257 }
258 }
259
260 ret = 0;
261
262 exit:
263 kfree(configs);
264 return ret;
265 }
266
267 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
268 struct device_node *np_config,
269 struct pinctrl_map **map,
270 unsigned *num_maps)
271 {
272 struct samsung_pinctrl_drv_data *drvdata;
273 unsigned reserved_maps;
274 struct device_node *np;
275 int ret;
276
277 drvdata = pinctrl_dev_get_drvdata(pctldev);
278
279 reserved_maps = 0;
280 *map = NULL;
281 *num_maps = 0;
282
283 if (!of_get_child_count(np_config))
284 return samsung_dt_subnode_to_map(drvdata, pctldev->dev,
285 np_config, map,
286 &reserved_maps,
287 num_maps);
288
289 for_each_child_of_node(np_config, np) {
290 ret = samsung_dt_subnode_to_map(drvdata, pctldev->dev, np, map,
291 &reserved_maps, num_maps);
292 if (ret < 0) {
293 samsung_dt_free_map(pctldev, *map, *num_maps);
294 return ret;
295 }
296 }
297
298 return 0;
299 }
300
301 /* list of pinctrl callbacks for the pinctrl core */
302 static const struct pinctrl_ops samsung_pctrl_ops = {
303 .get_groups_count = samsung_get_group_count,
304 .get_group_name = samsung_get_group_name,
305 .get_group_pins = samsung_get_group_pins,
306 .dt_node_to_map = samsung_dt_node_to_map,
307 .dt_free_map = samsung_dt_free_map,
308 };
309
310 /* check if the selector is a valid pin function selector */
311 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
312 {
313 struct samsung_pinctrl_drv_data *drvdata;
314
315 drvdata = pinctrl_dev_get_drvdata(pctldev);
316 return drvdata->nr_functions;
317 }
318
319 /* return the name of the pin function specified */
320 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
321 unsigned selector)
322 {
323 struct samsung_pinctrl_drv_data *drvdata;
324
325 drvdata = pinctrl_dev_get_drvdata(pctldev);
326 return drvdata->pmx_functions[selector].name;
327 }
328
329 /* return the groups associated for the specified function selector */
330 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
331 unsigned selector, const char * const **groups,
332 unsigned * const num_groups)
333 {
334 struct samsung_pinctrl_drv_data *drvdata;
335
336 drvdata = pinctrl_dev_get_drvdata(pctldev);
337 *groups = drvdata->pmx_functions[selector].groups;
338 *num_groups = drvdata->pmx_functions[selector].num_groups;
339 return 0;
340 }
341
342 /*
343 * given a pin number that is local to a pin controller, find out the pin bank
344 * and the register base of the pin bank.
345 */
346 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
347 unsigned pin, void __iomem **reg, u32 *offset,
348 struct samsung_pin_bank **bank)
349 {
350 struct samsung_pin_bank *b;
351
352 b = drvdata->ctrl->pin_banks;
353
354 while ((pin >= b->pin_base) &&
355 ((b->pin_base + b->nr_pins - 1) < pin))
356 b++;
357
358 *reg = drvdata->virt_base + b->pctl_offset;
359 *offset = pin - b->pin_base;
360 if (bank)
361 *bank = b;
362 }
363
364 /* enable or disable a pinmux function */
365 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
366 unsigned group, bool enable)
367 {
368 struct samsung_pinctrl_drv_data *drvdata;
369 struct samsung_pin_bank_type *type;
370 struct samsung_pin_bank *bank;
371 void __iomem *reg;
372 u32 mask, shift, data, pin_offset;
373 unsigned long flags;
374 const struct samsung_pmx_func *func;
375 const struct samsung_pin_group *grp;
376
377 drvdata = pinctrl_dev_get_drvdata(pctldev);
378 func = &drvdata->pmx_functions[selector];
379 grp = &drvdata->pin_groups[group];
380
381 pin_to_reg_bank(drvdata, grp->pins[0] - drvdata->ctrl->base,
382 &reg, &pin_offset, &bank);
383 type = bank->type;
384 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
385 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
386 if (shift >= 32) {
387 /* Some banks have two config registers */
388 shift -= 32;
389 reg += 4;
390 }
391
392 spin_lock_irqsave(&bank->slock, flags);
393
394 data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
395 data &= ~(mask << shift);
396 if (enable)
397 data |= func->val << shift;
398 writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
399
400 spin_unlock_irqrestore(&bank->slock, flags);
401 }
402
403 /* enable a specified pinmux by writing to registers */
404 static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
405 unsigned group)
406 {
407 samsung_pinmux_setup(pctldev, selector, group, true);
408 return 0;
409 }
410
411 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
412 static const struct pinmux_ops samsung_pinmux_ops = {
413 .get_functions_count = samsung_get_functions_count,
414 .get_function_name = samsung_pinmux_get_fname,
415 .get_function_groups = samsung_pinmux_get_groups,
416 .enable = samsung_pinmux_enable,
417 };
418
419 /* set or get the pin config settings for a specified pin */
420 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
421 unsigned long *config, bool set)
422 {
423 struct samsung_pinctrl_drv_data *drvdata;
424 struct samsung_pin_bank_type *type;
425 struct samsung_pin_bank *bank;
426 void __iomem *reg_base;
427 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
428 u32 data, width, pin_offset, mask, shift;
429 u32 cfg_value, cfg_reg;
430 unsigned long flags;
431
432 drvdata = pinctrl_dev_get_drvdata(pctldev);
433 pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, &reg_base,
434 &pin_offset, &bank);
435 type = bank->type;
436
437 if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
438 return -EINVAL;
439
440 width = type->fld_width[cfg_type];
441 cfg_reg = type->reg_offset[cfg_type];
442
443 spin_lock_irqsave(&bank->slock, flags);
444
445 mask = (1 << width) - 1;
446 shift = pin_offset * width;
447 data = readl(reg_base + cfg_reg);
448
449 if (set) {
450 cfg_value = PINCFG_UNPACK_VALUE(*config);
451 data &= ~(mask << shift);
452 data |= (cfg_value << shift);
453 writel(data, reg_base + cfg_reg);
454 } else {
455 data >>= shift;
456 data &= mask;
457 *config = PINCFG_PACK(cfg_type, data);
458 }
459
460 spin_unlock_irqrestore(&bank->slock, flags);
461
462 return 0;
463 }
464
465 /* set the pin config settings for a specified pin */
466 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
467 unsigned long *configs, unsigned num_configs)
468 {
469 int i, ret;
470
471 for (i = 0; i < num_configs; i++) {
472 ret = samsung_pinconf_rw(pctldev, pin, &configs[i], true);
473 if (ret < 0)
474 return ret;
475 } /* for each config */
476
477 return 0;
478 }
479
480 /* get the pin config settings for a specified pin */
481 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
482 unsigned long *config)
483 {
484 return samsung_pinconf_rw(pctldev, pin, config, false);
485 }
486
487 /* set the pin config settings for a specified pin group */
488 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
489 unsigned group, unsigned long *configs,
490 unsigned num_configs)
491 {
492 struct samsung_pinctrl_drv_data *drvdata;
493 const unsigned int *pins;
494 unsigned int cnt;
495
496 drvdata = pinctrl_dev_get_drvdata(pctldev);
497 pins = drvdata->pin_groups[group].pins;
498
499 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
500 samsung_pinconf_set(pctldev, pins[cnt], configs, num_configs);
501
502 return 0;
503 }
504
505 /* get the pin config settings for a specified pin group */
506 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
507 unsigned int group, unsigned long *config)
508 {
509 struct samsung_pinctrl_drv_data *drvdata;
510 const unsigned int *pins;
511
512 drvdata = pinctrl_dev_get_drvdata(pctldev);
513 pins = drvdata->pin_groups[group].pins;
514 samsung_pinconf_get(pctldev, pins[0], config);
515 return 0;
516 }
517
518 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
519 static const struct pinconf_ops samsung_pinconf_ops = {
520 .pin_config_get = samsung_pinconf_get,
521 .pin_config_set = samsung_pinconf_set,
522 .pin_config_group_get = samsung_pinconf_group_get,
523 .pin_config_group_set = samsung_pinconf_group_set,
524 };
525
526 /* gpiolib gpio_set callback function */
527 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
528 {
529 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
530 struct samsung_pin_bank_type *type = bank->type;
531 unsigned long flags;
532 void __iomem *reg;
533 u32 data;
534
535 reg = bank->drvdata->virt_base + bank->pctl_offset;
536
537 spin_lock_irqsave(&bank->slock, flags);
538
539 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
540 data &= ~(1 << offset);
541 if (value)
542 data |= 1 << offset;
543 writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
544
545 spin_unlock_irqrestore(&bank->slock, flags);
546 }
547
548 /* gpiolib gpio_get callback function */
549 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
550 {
551 void __iomem *reg;
552 u32 data;
553 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
554 struct samsung_pin_bank_type *type = bank->type;
555
556 reg = bank->drvdata->virt_base + bank->pctl_offset;
557
558 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
559 data >>= offset;
560 data &= 1;
561 return data;
562 }
563
564 /*
565 * The calls to gpio_direction_output() and gpio_direction_input()
566 * leads to this function call.
567 */
568 static int samsung_gpio_set_direction(struct gpio_chip *gc,
569 unsigned offset, bool input)
570 {
571 struct samsung_pin_bank_type *type;
572 struct samsung_pin_bank *bank;
573 struct samsung_pinctrl_drv_data *drvdata;
574 void __iomem *reg;
575 u32 data, mask, shift;
576 unsigned long flags;
577
578 bank = gc_to_pin_bank(gc);
579 type = bank->type;
580 drvdata = bank->drvdata;
581
582 reg = drvdata->virt_base + bank->pctl_offset +
583 type->reg_offset[PINCFG_TYPE_FUNC];
584
585 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
586 shift = offset * type->fld_width[PINCFG_TYPE_FUNC];
587 if (shift >= 32) {
588 /* Some banks have two config registers */
589 shift -= 32;
590 reg += 4;
591 }
592
593 spin_lock_irqsave(&bank->slock, flags);
594
595 data = readl(reg);
596 data &= ~(mask << shift);
597 if (!input)
598 data |= FUNC_OUTPUT << shift;
599 writel(data, reg);
600
601 spin_unlock_irqrestore(&bank->slock, flags);
602
603 return 0;
604 }
605
606 /* gpiolib gpio_direction_input callback function. */
607 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
608 {
609 return samsung_gpio_set_direction(gc, offset, true);
610 }
611
612 /* gpiolib gpio_direction_output callback function. */
613 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
614 int value)
615 {
616 samsung_gpio_set(gc, offset, value);
617 return samsung_gpio_set_direction(gc, offset, false);
618 }
619
620 /*
621 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
622 * and a virtual IRQ, if not already present.
623 */
624 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
625 {
626 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
627 unsigned int virq;
628
629 if (!bank->irq_domain)
630 return -ENXIO;
631
632 virq = irq_create_mapping(bank->irq_domain, offset);
633
634 return (virq) ? : -ENXIO;
635 }
636
637 static struct samsung_pin_group *samsung_pinctrl_create_groups(
638 struct device *dev,
639 struct samsung_pinctrl_drv_data *drvdata,
640 unsigned int *cnt)
641 {
642 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
643 struct samsung_pin_group *groups, *grp;
644 const struct pinctrl_pin_desc *pdesc;
645 int i;
646
647 groups = devm_kzalloc(dev, ctrldesc->npins * sizeof(*groups),
648 GFP_KERNEL);
649 if (!groups)
650 return ERR_PTR(-EINVAL);
651 grp = groups;
652
653 pdesc = ctrldesc->pins;
654 for (i = 0; i < ctrldesc->npins; ++i, ++pdesc, ++grp) {
655 grp->name = pdesc->name;
656 grp->pins = &pdesc->number;
657 grp->num_pins = 1;
658 }
659
660 *cnt = ctrldesc->npins;
661 return groups;
662 }
663
664 static int samsung_pinctrl_create_function(struct device *dev,
665 struct samsung_pinctrl_drv_data *drvdata,
666 struct device_node *func_np,
667 struct samsung_pmx_func *func)
668 {
669 int npins;
670 int ret;
671 int i;
672
673 if (of_property_read_u32(func_np, "samsung,pin-function", &func->val))
674 return 0;
675
676 npins = of_property_count_strings(func_np, "samsung,pins");
677 if (npins < 1) {
678 dev_err(dev, "invalid pin list in %s node", func_np->name);
679 return -EINVAL;
680 }
681
682 func->name = func_np->full_name;
683
684 func->groups = devm_kzalloc(dev, npins * sizeof(char *), GFP_KERNEL);
685 if (!func->groups)
686 return -ENOMEM;
687
688 for (i = 0; i < npins; ++i) {
689 const char *gname;
690
691 ret = of_property_read_string_index(func_np, "samsung,pins",
692 i, &gname);
693 if (ret) {
694 dev_err(dev,
695 "failed to read pin name %d from %s node\n",
696 i, func_np->name);
697 return ret;
698 }
699
700 func->groups[i] = gname;
701 }
702
703 func->num_groups = npins;
704 return 1;
705 }
706
707 static struct samsung_pmx_func *samsung_pinctrl_create_functions(
708 struct device *dev,
709 struct samsung_pinctrl_drv_data *drvdata,
710 unsigned int *cnt)
711 {
712 struct samsung_pmx_func *functions, *func;
713 struct device_node *dev_np = dev->of_node;
714 struct device_node *cfg_np;
715 unsigned int func_cnt = 0;
716 int ret;
717
718 /*
719 * Iterate over all the child nodes of the pin controller node
720 * and create pin groups and pin function lists.
721 */
722 for_each_child_of_node(dev_np, cfg_np) {
723 struct device_node *func_np;
724
725 if (!of_get_child_count(cfg_np)) {
726 if (!of_find_property(cfg_np,
727 "samsung,pin-function", NULL))
728 continue;
729 ++func_cnt;
730 continue;
731 }
732
733 for_each_child_of_node(cfg_np, func_np) {
734 if (!of_find_property(func_np,
735 "samsung,pin-function", NULL))
736 continue;
737 ++func_cnt;
738 }
739 }
740
741 functions = devm_kzalloc(dev, func_cnt * sizeof(*functions),
742 GFP_KERNEL);
743 if (!functions) {
744 dev_err(dev, "failed to allocate memory for function list\n");
745 return ERR_PTR(-EINVAL);
746 }
747 func = functions;
748
749 /*
750 * Iterate over all the child nodes of the pin controller node
751 * and create pin groups and pin function lists.
752 */
753 func_cnt = 0;
754 for_each_child_of_node(dev_np, cfg_np) {
755 struct device_node *func_np;
756
757 if (!of_get_child_count(cfg_np)) {
758 ret = samsung_pinctrl_create_function(dev, drvdata,
759 cfg_np, func);
760 if (ret < 0)
761 return ERR_PTR(ret);
762 if (ret > 0) {
763 ++func;
764 ++func_cnt;
765 }
766 continue;
767 }
768
769 for_each_child_of_node(cfg_np, func_np) {
770 ret = samsung_pinctrl_create_function(dev, drvdata,
771 func_np, func);
772 if (ret < 0)
773 return ERR_PTR(ret);
774 if (ret > 0) {
775 ++func;
776 ++func_cnt;
777 }
778 }
779 }
780
781 *cnt = func_cnt;
782 return functions;
783 }
784
785 /*
786 * Parse the information about all the available pin groups and pin functions
787 * from device node of the pin-controller. A pin group is formed with all
788 * the pins listed in the "samsung,pins" property.
789 */
790
791 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
792 struct samsung_pinctrl_drv_data *drvdata)
793 {
794 struct device *dev = &pdev->dev;
795 struct samsung_pin_group *groups;
796 struct samsung_pmx_func *functions;
797 unsigned int grp_cnt = 0, func_cnt = 0;
798
799 groups = samsung_pinctrl_create_groups(dev, drvdata, &grp_cnt);
800 if (IS_ERR(groups)) {
801 dev_err(dev, "failed to parse pin groups\n");
802 return PTR_ERR(groups);
803 }
804
805 functions = samsung_pinctrl_create_functions(dev, drvdata, &func_cnt);
806 if (IS_ERR(functions)) {
807 dev_err(dev, "failed to parse pin functions\n");
808 return PTR_ERR(groups);
809 }
810
811 drvdata->pin_groups = groups;
812 drvdata->nr_groups = grp_cnt;
813 drvdata->pmx_functions = functions;
814 drvdata->nr_functions = func_cnt;
815
816 return 0;
817 }
818
819 /* register the pinctrl interface with the pinctrl subsystem */
820 static int samsung_pinctrl_register(struct platform_device *pdev,
821 struct samsung_pinctrl_drv_data *drvdata)
822 {
823 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
824 struct pinctrl_pin_desc *pindesc, *pdesc;
825 struct samsung_pin_bank *pin_bank;
826 char *pin_names;
827 int pin, bank, ret;
828
829 ctrldesc->name = "samsung-pinctrl";
830 ctrldesc->owner = THIS_MODULE;
831 ctrldesc->pctlops = &samsung_pctrl_ops;
832 ctrldesc->pmxops = &samsung_pinmux_ops;
833 ctrldesc->confops = &samsung_pinconf_ops;
834
835 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
836 drvdata->ctrl->nr_pins, GFP_KERNEL);
837 if (!pindesc) {
838 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
839 return -ENOMEM;
840 }
841 ctrldesc->pins = pindesc;
842 ctrldesc->npins = drvdata->ctrl->nr_pins;
843
844 /* dynamically populate the pin number and pin name for pindesc */
845 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
846 pdesc->number = pin + drvdata->ctrl->base;
847
848 /*
849 * allocate space for storing the dynamically generated names for all
850 * the pins which belong to this pin-controller.
851 */
852 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
853 drvdata->ctrl->nr_pins, GFP_KERNEL);
854 if (!pin_names) {
855 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
856 return -ENOMEM;
857 }
858
859 /* for each pin, the name of the pin is pin-bank name + pin number */
860 for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
861 pin_bank = &drvdata->ctrl->pin_banks[bank];
862 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
863 sprintf(pin_names, "%s-%d", pin_bank->name, pin);
864 pdesc = pindesc + pin_bank->pin_base + pin;
865 pdesc->name = pin_names;
866 pin_names += PIN_NAME_LENGTH;
867 }
868 }
869
870 ret = samsung_pinctrl_parse_dt(pdev, drvdata);
871 if (ret)
872 return ret;
873
874 drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
875 if (!drvdata->pctl_dev) {
876 dev_err(&pdev->dev, "could not register pinctrl driver\n");
877 return -EINVAL;
878 }
879
880 for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
881 pin_bank = &drvdata->ctrl->pin_banks[bank];
882 pin_bank->grange.name = pin_bank->name;
883 pin_bank->grange.id = bank;
884 pin_bank->grange.pin_base = drvdata->ctrl->base
885 + pin_bank->pin_base;
886 pin_bank->grange.base = pin_bank->gpio_chip.base;
887 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
888 pin_bank->grange.gc = &pin_bank->gpio_chip;
889 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
890 }
891
892 return 0;
893 }
894
895 static int samsung_gpio_request(struct gpio_chip *chip, unsigned offset)
896 {
897 return pinctrl_request_gpio(chip->base + offset);
898 }
899
900 static void samsung_gpio_free(struct gpio_chip *chip, unsigned offset)
901 {
902 pinctrl_free_gpio(chip->base + offset);
903 }
904
905 static const struct gpio_chip samsung_gpiolib_chip = {
906 .request = samsung_gpio_request,
907 .free = samsung_gpio_free,
908 .set = samsung_gpio_set,
909 .get = samsung_gpio_get,
910 .direction_input = samsung_gpio_direction_input,
911 .direction_output = samsung_gpio_direction_output,
912 .to_irq = samsung_gpio_to_irq,
913 .owner = THIS_MODULE,
914 };
915
916 /* register the gpiolib interface with the gpiolib subsystem */
917 static int samsung_gpiolib_register(struct platform_device *pdev,
918 struct samsung_pinctrl_drv_data *drvdata)
919 {
920 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
921 struct samsung_pin_bank *bank = ctrl->pin_banks;
922 struct gpio_chip *gc;
923 int ret;
924 int i;
925
926 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
927 bank->gpio_chip = samsung_gpiolib_chip;
928
929 gc = &bank->gpio_chip;
930 gc->base = ctrl->base + bank->pin_base;
931 gc->ngpio = bank->nr_pins;
932 gc->dev = &pdev->dev;
933 gc->of_node = bank->of_node;
934 gc->label = bank->name;
935
936 ret = gpiochip_add(gc);
937 if (ret) {
938 dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
939 gc->label, ret);
940 goto fail;
941 }
942 }
943
944 return 0;
945
946 fail:
947 for (--i, --bank; i >= 0; --i, --bank)
948 if (gpiochip_remove(&bank->gpio_chip))
949 dev_err(&pdev->dev, "gpio chip %s remove failed\n",
950 bank->gpio_chip.label);
951 return ret;
952 }
953
954 /* unregister the gpiolib interface with the gpiolib subsystem */
955 static int samsung_gpiolib_unregister(struct platform_device *pdev,
956 struct samsung_pinctrl_drv_data *drvdata)
957 {
958 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
959 struct samsung_pin_bank *bank = ctrl->pin_banks;
960 int ret = 0;
961 int i;
962
963 for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
964 ret = gpiochip_remove(&bank->gpio_chip);
965
966 if (ret)
967 dev_err(&pdev->dev, "gpio chip remove failed\n");
968
969 return ret;
970 }
971
972 static const struct of_device_id samsung_pinctrl_dt_match[];
973
974 /* retrieve the soc specific data */
975 static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
976 struct samsung_pinctrl_drv_data *d,
977 struct platform_device *pdev)
978 {
979 int id;
980 const struct of_device_id *match;
981 struct device_node *node = pdev->dev.of_node;
982 struct device_node *np;
983 struct samsung_pin_ctrl *ctrl;
984 struct samsung_pin_bank *bank;
985 int i;
986
987 id = of_alias_get_id(node, "pinctrl");
988 if (id < 0) {
989 dev_err(&pdev->dev, "failed to get alias id\n");
990 return NULL;
991 }
992 match = of_match_node(samsung_pinctrl_dt_match, node);
993 ctrl = (struct samsung_pin_ctrl *)match->data + id;
994
995 bank = ctrl->pin_banks;
996 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
997 spin_lock_init(&bank->slock);
998 bank->drvdata = d;
999 bank->pin_base = ctrl->nr_pins;
1000 ctrl->nr_pins += bank->nr_pins;
1001 }
1002
1003 for_each_child_of_node(node, np) {
1004 if (!of_find_property(np, "gpio-controller", NULL))
1005 continue;
1006 bank = ctrl->pin_banks;
1007 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
1008 if (!strcmp(bank->name, np->name)) {
1009 bank->of_node = np;
1010 break;
1011 }
1012 }
1013 }
1014
1015 ctrl->base = pin_base;
1016 pin_base += ctrl->nr_pins;
1017
1018 return ctrl;
1019 }
1020
1021 static int samsung_pinctrl_probe(struct platform_device *pdev)
1022 {
1023 struct samsung_pinctrl_drv_data *drvdata;
1024 struct device *dev = &pdev->dev;
1025 struct samsung_pin_ctrl *ctrl;
1026 struct resource *res;
1027 int ret;
1028
1029 if (!dev->of_node) {
1030 dev_err(dev, "device tree node not found\n");
1031 return -ENODEV;
1032 }
1033
1034 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
1035 if (!drvdata) {
1036 dev_err(dev, "failed to allocate memory for driver's "
1037 "private data\n");
1038 return -ENOMEM;
1039 }
1040
1041 ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
1042 if (!ctrl) {
1043 dev_err(&pdev->dev, "driver data not available\n");
1044 return -EINVAL;
1045 }
1046 drvdata->ctrl = ctrl;
1047 drvdata->dev = dev;
1048
1049 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1050 drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
1051 if (IS_ERR(drvdata->virt_base))
1052 return PTR_ERR(drvdata->virt_base);
1053
1054 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1055 if (res)
1056 drvdata->irq = res->start;
1057
1058 ret = samsung_gpiolib_register(pdev, drvdata);
1059 if (ret)
1060 return ret;
1061
1062 ret = samsung_pinctrl_register(pdev, drvdata);
1063 if (ret) {
1064 samsung_gpiolib_unregister(pdev, drvdata);
1065 return ret;
1066 }
1067
1068 if (ctrl->eint_gpio_init)
1069 ctrl->eint_gpio_init(drvdata);
1070 if (ctrl->eint_wkup_init)
1071 ctrl->eint_wkup_init(drvdata);
1072
1073 platform_set_drvdata(pdev, drvdata);
1074
1075 /* Add to the global list */
1076 list_add_tail(&drvdata->node, &drvdata_list);
1077
1078 return 0;
1079 }
1080
1081 #ifdef CONFIG_PM
1082
1083 /**
1084 * samsung_pinctrl_suspend_dev - save pinctrl state for suspend for a device
1085 *
1086 * Save data for all banks handled by this device.
1087 */
1088 static void samsung_pinctrl_suspend_dev(
1089 struct samsung_pinctrl_drv_data *drvdata)
1090 {
1091 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
1092 void __iomem *virt_base = drvdata->virt_base;
1093 int i;
1094
1095 for (i = 0; i < ctrl->nr_banks; i++) {
1096 struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
1097 void __iomem *reg = virt_base + bank->pctl_offset;
1098
1099 u8 *offs = bank->type->reg_offset;
1100 u8 *widths = bank->type->fld_width;
1101 enum pincfg_type type;
1102
1103 /* Registers without a powerdown config aren't lost */
1104 if (!widths[PINCFG_TYPE_CON_PDN])
1105 continue;
1106
1107 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1108 if (widths[type])
1109 bank->pm_save[type] = readl(reg + offs[type]);
1110
1111 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1112 /* Some banks have two config registers */
1113 bank->pm_save[PINCFG_TYPE_NUM] =
1114 readl(reg + offs[PINCFG_TYPE_FUNC] + 4);
1115 pr_debug("Save %s @ %p (con %#010x %08x)\n",
1116 bank->name, reg,
1117 bank->pm_save[PINCFG_TYPE_FUNC],
1118 bank->pm_save[PINCFG_TYPE_NUM]);
1119 } else {
1120 pr_debug("Save %s @ %p (con %#010x)\n", bank->name,
1121 reg, bank->pm_save[PINCFG_TYPE_FUNC]);
1122 }
1123 }
1124
1125 if (ctrl->suspend)
1126 ctrl->suspend(drvdata);
1127 }
1128
1129 /**
1130 * samsung_pinctrl_resume_dev - restore pinctrl state from suspend for a device
1131 *
1132 * Restore one of the banks that was saved during suspend.
1133 *
1134 * We don't bother doing anything complicated to avoid glitching lines since
1135 * we're called before pad retention is turned off.
1136 */
1137 static void samsung_pinctrl_resume_dev(struct samsung_pinctrl_drv_data *drvdata)
1138 {
1139 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
1140 void __iomem *virt_base = drvdata->virt_base;
1141 int i;
1142
1143 if (ctrl->resume)
1144 ctrl->resume(drvdata);
1145
1146 for (i = 0; i < ctrl->nr_banks; i++) {
1147 struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
1148 void __iomem *reg = virt_base + bank->pctl_offset;
1149
1150 u8 *offs = bank->type->reg_offset;
1151 u8 *widths = bank->type->fld_width;
1152 enum pincfg_type type;
1153
1154 /* Registers without a powerdown config aren't lost */
1155 if (!widths[PINCFG_TYPE_CON_PDN])
1156 continue;
1157
1158 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1159 /* Some banks have two config registers */
1160 pr_debug("%s @ %p (con %#010x %08x => %#010x %08x)\n",
1161 bank->name, reg,
1162 readl(reg + offs[PINCFG_TYPE_FUNC]),
1163 readl(reg + offs[PINCFG_TYPE_FUNC] + 4),
1164 bank->pm_save[PINCFG_TYPE_FUNC],
1165 bank->pm_save[PINCFG_TYPE_NUM]);
1166 writel(bank->pm_save[PINCFG_TYPE_NUM],
1167 reg + offs[PINCFG_TYPE_FUNC] + 4);
1168 } else {
1169 pr_debug("%s @ %p (con %#010x => %#010x)\n", bank->name,
1170 reg, readl(reg + offs[PINCFG_TYPE_FUNC]),
1171 bank->pm_save[PINCFG_TYPE_FUNC]);
1172 }
1173 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1174 if (widths[type])
1175 writel(bank->pm_save[type], reg + offs[type]);
1176 }
1177 }
1178
1179 /**
1180 * samsung_pinctrl_suspend - save pinctrl state for suspend
1181 *
1182 * Save data for all banks across all devices.
1183 */
1184 static int samsung_pinctrl_suspend(void)
1185 {
1186 struct samsung_pinctrl_drv_data *drvdata;
1187
1188 list_for_each_entry(drvdata, &drvdata_list, node) {
1189 samsung_pinctrl_suspend_dev(drvdata);
1190 }
1191
1192 return 0;
1193 }
1194
1195 /**
1196 * samsung_pinctrl_resume - restore pinctrl state for suspend
1197 *
1198 * Restore data for all banks across all devices.
1199 */
1200 static void samsung_pinctrl_resume(void)
1201 {
1202 struct samsung_pinctrl_drv_data *drvdata;
1203
1204 list_for_each_entry_reverse(drvdata, &drvdata_list, node) {
1205 samsung_pinctrl_resume_dev(drvdata);
1206 }
1207 }
1208
1209 #else
1210 #define samsung_pinctrl_suspend NULL
1211 #define samsung_pinctrl_resume NULL
1212 #endif
1213
1214 static struct syscore_ops samsung_pinctrl_syscore_ops = {
1215 .suspend = samsung_pinctrl_suspend,
1216 .resume = samsung_pinctrl_resume,
1217 };
1218
1219 static const struct of_device_id samsung_pinctrl_dt_match[] = {
1220 #ifdef CONFIG_PINCTRL_EXYNOS
1221 { .compatible = "samsung,exynos3250-pinctrl",
1222 .data = (void *)exynos3250_pin_ctrl },
1223 { .compatible = "samsung,exynos4210-pinctrl",
1224 .data = (void *)exynos4210_pin_ctrl },
1225 { .compatible = "samsung,exynos4x12-pinctrl",
1226 .data = (void *)exynos4x12_pin_ctrl },
1227 { .compatible = "samsung,exynos5250-pinctrl",
1228 .data = (void *)exynos5250_pin_ctrl },
1229 { .compatible = "samsung,exynos5260-pinctrl",
1230 .data = (void *)exynos5260_pin_ctrl },
1231 { .compatible = "samsung,exynos5420-pinctrl",
1232 .data = (void *)exynos5420_pin_ctrl },
1233 { .compatible = "samsung,s5pv210-pinctrl",
1234 .data = (void *)s5pv210_pin_ctrl },
1235 #endif
1236 #ifdef CONFIG_PINCTRL_S3C64XX
1237 { .compatible = "samsung,s3c64xx-pinctrl",
1238 .data = s3c64xx_pin_ctrl },
1239 #endif
1240 #ifdef CONFIG_PINCTRL_S3C24XX
1241 { .compatible = "samsung,s3c2412-pinctrl",
1242 .data = s3c2412_pin_ctrl },
1243 { .compatible = "samsung,s3c2416-pinctrl",
1244 .data = s3c2416_pin_ctrl },
1245 { .compatible = "samsung,s3c2440-pinctrl",
1246 .data = s3c2440_pin_ctrl },
1247 { .compatible = "samsung,s3c2450-pinctrl",
1248 .data = s3c2450_pin_ctrl },
1249 #endif
1250 {},
1251 };
1252 MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
1253
1254 static struct platform_driver samsung_pinctrl_driver = {
1255 .probe = samsung_pinctrl_probe,
1256 .driver = {
1257 .name = "samsung-pinctrl",
1258 .owner = THIS_MODULE,
1259 .of_match_table = samsung_pinctrl_dt_match,
1260 },
1261 };
1262
1263 static int __init samsung_pinctrl_drv_register(void)
1264 {
1265 /*
1266 * Register syscore ops for save/restore of registers across suspend.
1267 * It's important to ensure that this driver is running at an earlier
1268 * initcall level than any arch-specific init calls that install syscore
1269 * ops that turn off pad retention (like exynos_pm_resume).
1270 */
1271 register_syscore_ops(&samsung_pinctrl_syscore_ops);
1272
1273 return platform_driver_register(&samsung_pinctrl_driver);
1274 }
1275 postcore_initcall(samsung_pinctrl_drv_register);
1276
1277 static void __exit samsung_pinctrl_drv_unregister(void)
1278 {
1279 platform_driver_unregister(&samsung_pinctrl_driver);
1280 }
1281 module_exit(samsung_pinctrl_drv_unregister);
1282
1283 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
1284 MODULE_DESCRIPTION("Samsung pinctrl driver");
1285 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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