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Linux 3.11-rc3
[cris-mirror.git] / drivers / pinctrl / pinctrl-samsung.c
bloba7fa9e2d475137252de98d7ff635171ff6124540
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 char *prop_cfg;
44 unsigned int cfg_type;
45 } pcfgs[] = {
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 };
51
52 /* Global list of devices (struct samsung_pinctrl_drv_data) */
53 static LIST_HEAD(drvdata_list);
54
55 static unsigned int pin_base;
56
57 static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
58 {
59 return container_of(gc, struct samsung_pin_bank, gpio_chip);
60 }
61
62 /* check if the selector is a valid pin group selector */
63 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
64 {
65 struct samsung_pinctrl_drv_data *drvdata;
66
67 drvdata = pinctrl_dev_get_drvdata(pctldev);
68 return drvdata->nr_groups;
69 }
70
71 /* return the name of the group selected by the group selector */
72 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
73 unsigned selector)
74 {
75 struct samsung_pinctrl_drv_data *drvdata;
76
77 drvdata = pinctrl_dev_get_drvdata(pctldev);
78 return drvdata->pin_groups[selector].name;
79 }
80
81 /* return the pin numbers associated with the specified group */
82 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
83 unsigned selector, const unsigned **pins, unsigned *num_pins)
84 {
85 struct samsung_pinctrl_drv_data *drvdata;
86
87 drvdata = pinctrl_dev_get_drvdata(pctldev);
88 *pins = drvdata->pin_groups[selector].pins;
89 *num_pins = drvdata->pin_groups[selector].num_pins;
90 return 0;
91 }
92
93 /* create pinctrl_map entries by parsing device tree nodes */
94 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
95 struct device_node *np, struct pinctrl_map **maps,
96 unsigned *nmaps)
97 {
98 struct device *dev = pctldev->dev;
99 struct pinctrl_map *map;
100 unsigned long *cfg = NULL;
101 char *gname, *fname;
102 int cfg_cnt = 0, map_cnt = 0, idx = 0;
103
104 /* count the number of config options specfied in the node */
105 for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
106 if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
107 cfg_cnt++;
108 }
109
110 /*
111 * Find out the number of map entries to create. All the config options
112 * can be accomadated into a single config map entry.
113 */
114 if (cfg_cnt)
115 map_cnt = 1;
116 if (of_find_property(np, "samsung,pin-function", NULL))
117 map_cnt++;
118 if (!map_cnt) {
119 dev_err(dev, "node %s does not have either config or function "
120 "configurations\n", np->name);
121 return -EINVAL;
122 }
123
124 /* Allocate memory for pin-map entries */
125 map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
126 if (!map) {
127 dev_err(dev, "could not alloc memory for pin-maps\n");
128 return -ENOMEM;
129 }
130 *nmaps = 0;
131
132 /*
133 * Allocate memory for pin group name. The pin group name is derived
134 * from the node name from which these map entries are be created.
135 */
136 gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
137 if (!gname) {
138 dev_err(dev, "failed to alloc memory for group name\n");
139 goto free_map;
140 }
141 sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
142
143 /*
144 * don't have config options? then skip over to creating function
145 * map entries.
146 */
147 if (!cfg_cnt)
148 goto skip_cfgs;
149
150 /* Allocate memory for config entries */
151 cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
152 if (!cfg) {
153 dev_err(dev, "failed to alloc memory for configs\n");
154 goto free_gname;
155 }
156
157 /* Prepare a list of config settings */
158 for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
159 u32 value;
160 if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
161 cfg[cfg_cnt++] =
162 PINCFG_PACK(pcfgs[idx].cfg_type, value);
163 }
164
165 /* create the config map entry */
166 map[*nmaps].data.configs.group_or_pin = gname;
167 map[*nmaps].data.configs.configs = cfg;
168 map[*nmaps].data.configs.num_configs = cfg_cnt;
169 map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
170 *nmaps += 1;
171
172 skip_cfgs:
173 /* create the function map entry */
174 if (of_find_property(np, "samsung,pin-function", NULL)) {
175 fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
176 if (!fname) {
177 dev_err(dev, "failed to alloc memory for func name\n");
178 goto free_cfg;
179 }
180 sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
181
182 map[*nmaps].data.mux.group = gname;
183 map[*nmaps].data.mux.function = fname;
184 map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
185 *nmaps += 1;
186 }
187
188 *maps = map;
189 return 0;
190
191 free_cfg:
192 kfree(cfg);
193 free_gname:
194 kfree(gname);
195 free_map:
196 kfree(map);
197 return -ENOMEM;
198 }
199
200 /* free the memory allocated to hold the pin-map table */
201 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
202 struct pinctrl_map *map, unsigned num_maps)
203 {
204 int idx;
205
206 for (idx = 0; idx < num_maps; idx++) {
207 if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
208 kfree(map[idx].data.mux.function);
209 if (!idx)
210 kfree(map[idx].data.mux.group);
211 } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
212 kfree(map[idx].data.configs.configs);
213 if (!idx)
214 kfree(map[idx].data.configs.group_or_pin);
215 }
216 };
217
218 kfree(map);
219 }
220
221 /* list of pinctrl callbacks for the pinctrl core */
222 static const struct pinctrl_ops samsung_pctrl_ops = {
223 .get_groups_count = samsung_get_group_count,
224 .get_group_name = samsung_get_group_name,
225 .get_group_pins = samsung_get_group_pins,
226 .dt_node_to_map = samsung_dt_node_to_map,
227 .dt_free_map = samsung_dt_free_map,
228 };
229
230 /* check if the selector is a valid pin function selector */
231 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
232 {
233 struct samsung_pinctrl_drv_data *drvdata;
234
235 drvdata = pinctrl_dev_get_drvdata(pctldev);
236 return drvdata->nr_functions;
237 }
238
239 /* return the name of the pin function specified */
240 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
241 unsigned selector)
242 {
243 struct samsung_pinctrl_drv_data *drvdata;
244
245 drvdata = pinctrl_dev_get_drvdata(pctldev);
246 return drvdata->pmx_functions[selector].name;
247 }
248
249 /* return the groups associated for the specified function selector */
250 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
251 unsigned selector, const char * const **groups,
252 unsigned * const num_groups)
253 {
254 struct samsung_pinctrl_drv_data *drvdata;
255
256 drvdata = pinctrl_dev_get_drvdata(pctldev);
257 *groups = drvdata->pmx_functions[selector].groups;
258 *num_groups = drvdata->pmx_functions[selector].num_groups;
259 return 0;
260 }
261
262 /*
263 * given a pin number that is local to a pin controller, find out the pin bank
264 * and the register base of the pin bank.
265 */
266 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
267 unsigned pin, void __iomem **reg, u32 *offset,
268 struct samsung_pin_bank **bank)
269 {
270 struct samsung_pin_bank *b;
271
272 b = drvdata->ctrl->pin_banks;
273
274 while ((pin >= b->pin_base) &&
275 ((b->pin_base + b->nr_pins - 1) < pin))
276 b++;
277
278 *reg = drvdata->virt_base + b->pctl_offset;
279 *offset = pin - b->pin_base;
280 if (bank)
281 *bank = b;
282 }
283
284 /* enable or disable a pinmux function */
285 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
286 unsigned group, bool enable)
287 {
288 struct samsung_pinctrl_drv_data *drvdata;
289 const unsigned int *pins;
290 struct samsung_pin_bank *bank;
291 void __iomem *reg;
292 u32 mask, shift, data, pin_offset, cnt;
293 unsigned long flags;
294
295 drvdata = pinctrl_dev_get_drvdata(pctldev);
296 pins = drvdata->pin_groups[group].pins;
297
298 /*
299 * for each pin in the pin group selected, program the correspoding pin
300 * pin function number in the config register.
301 */
302 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
303 struct samsung_pin_bank_type *type;
304
305 pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base,
306 &reg, &pin_offset, &bank);
307 type = bank->type;
308 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
309 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
310 if (shift >= 32) {
311 /* Some banks have two config registers */
312 shift -= 32;
313 reg += 4;
314 }
315
316 spin_lock_irqsave(&bank->slock, flags);
317
318 data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
319 data &= ~(mask << shift);
320 if (enable)
321 data |= drvdata->pin_groups[group].func << shift;
322 writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
323
324 spin_unlock_irqrestore(&bank->slock, flags);
325 }
326 }
327
328 /* enable a specified pinmux by writing to registers */
329 static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
330 unsigned group)
331 {
332 samsung_pinmux_setup(pctldev, selector, group, true);
333 return 0;
334 }
335
336 /* disable a specified pinmux by writing to registers */
337 static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
338 unsigned selector, unsigned group)
339 {
340 samsung_pinmux_setup(pctldev, selector, group, false);
341 }
342
343 /*
344 * The calls to gpio_direction_output() and gpio_direction_input()
345 * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
346 * function called from the gpiolib interface).
347 */
348 static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
349 struct pinctrl_gpio_range *range, unsigned offset, bool input)
350 {
351 struct samsung_pin_bank_type *type;
352 struct samsung_pin_bank *bank;
353 struct samsung_pinctrl_drv_data *drvdata;
354 void __iomem *reg;
355 u32 data, pin_offset, mask, shift;
356 unsigned long flags;
357
358 bank = gc_to_pin_bank(range->gc);
359 type = bank->type;
360 drvdata = pinctrl_dev_get_drvdata(pctldev);
361
362 pin_offset = offset - bank->pin_base;
363 reg = drvdata->virt_base + bank->pctl_offset +
364 type->reg_offset[PINCFG_TYPE_FUNC];
365
366 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
367 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
368 if (shift >= 32) {
369 /* Some banks have two config registers */
370 shift -= 32;
371 reg += 4;
372 }
373
374 spin_lock_irqsave(&bank->slock, flags);
375
376 data = readl(reg);
377 data &= ~(mask << shift);
378 if (!input)
379 data |= FUNC_OUTPUT << shift;
380 writel(data, reg);
381
382 spin_unlock_irqrestore(&bank->slock, flags);
383
384 return 0;
385 }
386
387 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
388 static const struct pinmux_ops samsung_pinmux_ops = {
389 .get_functions_count = samsung_get_functions_count,
390 .get_function_name = samsung_pinmux_get_fname,
391 .get_function_groups = samsung_pinmux_get_groups,
392 .enable = samsung_pinmux_enable,
393 .disable = samsung_pinmux_disable,
394 .gpio_set_direction = samsung_pinmux_gpio_set_direction,
395 };
396
397 /* set or get the pin config settings for a specified pin */
398 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
399 unsigned long *config, bool set)
400 {
401 struct samsung_pinctrl_drv_data *drvdata;
402 struct samsung_pin_bank_type *type;
403 struct samsung_pin_bank *bank;
404 void __iomem *reg_base;
405 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
406 u32 data, width, pin_offset, mask, shift;
407 u32 cfg_value, cfg_reg;
408 unsigned long flags;
409
410 drvdata = pinctrl_dev_get_drvdata(pctldev);
411 pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, &reg_base,
412 &pin_offset, &bank);
413 type = bank->type;
414
415 if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
416 return -EINVAL;
417
418 width = type->fld_width[cfg_type];
419 cfg_reg = type->reg_offset[cfg_type];
420
421 spin_lock_irqsave(&bank->slock, flags);
422
423 mask = (1 << width) - 1;
424 shift = pin_offset * width;
425 data = readl(reg_base + cfg_reg);
426
427 if (set) {
428 cfg_value = PINCFG_UNPACK_VALUE(*config);
429 data &= ~(mask << shift);
430 data |= (cfg_value << shift);
431 writel(data, reg_base + cfg_reg);
432 } else {
433 data >>= shift;
434 data &= mask;
435 *config = PINCFG_PACK(cfg_type, data);
436 }
437
438 spin_unlock_irqrestore(&bank->slock, flags);
439
440 return 0;
441 }
442
443 /* set the pin config settings for a specified pin */
444 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
445 unsigned long config)
446 {
447 return samsung_pinconf_rw(pctldev, pin, &config, true);
448 }
449
450 /* get the pin config settings for a specified pin */
451 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
452 unsigned long *config)
453 {
454 return samsung_pinconf_rw(pctldev, pin, config, false);
455 }
456
457 /* set the pin config settings for a specified pin group */
458 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
459 unsigned group, unsigned long config)
460 {
461 struct samsung_pinctrl_drv_data *drvdata;
462 const unsigned int *pins;
463 unsigned int cnt;
464
465 drvdata = pinctrl_dev_get_drvdata(pctldev);
466 pins = drvdata->pin_groups[group].pins;
467
468 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
469 samsung_pinconf_set(pctldev, pins[cnt], config);
470
471 return 0;
472 }
473
474 /* get the pin config settings for a specified pin group */
475 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
476 unsigned int group, unsigned long *config)
477 {
478 struct samsung_pinctrl_drv_data *drvdata;
479 const unsigned int *pins;
480
481 drvdata = pinctrl_dev_get_drvdata(pctldev);
482 pins = drvdata->pin_groups[group].pins;
483 samsung_pinconf_get(pctldev, pins[0], config);
484 return 0;
485 }
486
487 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
488 static const struct pinconf_ops samsung_pinconf_ops = {
489 .pin_config_get = samsung_pinconf_get,
490 .pin_config_set = samsung_pinconf_set,
491 .pin_config_group_get = samsung_pinconf_group_get,
492 .pin_config_group_set = samsung_pinconf_group_set,
493 };
494
495 /* gpiolib gpio_set callback function */
496 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
497 {
498 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
499 struct samsung_pin_bank_type *type = bank->type;
500 unsigned long flags;
501 void __iomem *reg;
502 u32 data;
503
504 reg = bank->drvdata->virt_base + bank->pctl_offset;
505
506 spin_lock_irqsave(&bank->slock, flags);
507
508 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
509 data &= ~(1 << offset);
510 if (value)
511 data |= 1 << offset;
512 writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
513
514 spin_unlock_irqrestore(&bank->slock, flags);
515 }
516
517 /* gpiolib gpio_get callback function */
518 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
519 {
520 void __iomem *reg;
521 u32 data;
522 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
523 struct samsung_pin_bank_type *type = bank->type;
524
525 reg = bank->drvdata->virt_base + bank->pctl_offset;
526
527 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
528 data >>= offset;
529 data &= 1;
530 return data;
531 }
532
533 /*
534 * gpiolib gpio_direction_input callback function. The setting of the pin
535 * mux function as 'gpio input' will be handled by the pinctrl susbsystem
536 * interface.
537 */
538 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
539 {
540 return pinctrl_gpio_direction_input(gc->base + offset);
541 }
542
543 /*
544 * gpiolib gpio_direction_output callback function. The setting of the pin
545 * mux function as 'gpio output' will be handled by the pinctrl susbsystem
546 * interface.
547 */
548 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
549 int value)
550 {
551 samsung_gpio_set(gc, offset, value);
552 return pinctrl_gpio_direction_output(gc->base + offset);
553 }
554
555 /*
556 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
557 * and a virtual IRQ, if not already present.
558 */
559 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
560 {
561 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
562 unsigned int virq;
563
564 if (!bank->irq_domain)
565 return -ENXIO;
566
567 virq = irq_create_mapping(bank->irq_domain, offset);
568
569 return (virq) ? : -ENXIO;
570 }
571
572 /*
573 * Parse the pin names listed in the 'samsung,pins' property and convert it
574 * into a list of gpio numbers are create a pin group from it.
575 */
576 static int samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
577 struct device_node *cfg_np,
578 struct pinctrl_desc *pctl,
579 unsigned int **pin_list,
580 unsigned int *npins)
581 {
582 struct device *dev = &pdev->dev;
583 struct property *prop;
584 struct pinctrl_pin_desc const *pdesc = pctl->pins;
585 unsigned int idx = 0, cnt;
586 const char *pin_name;
587
588 *npins = of_property_count_strings(cfg_np, "samsung,pins");
589 if (IS_ERR_VALUE(*npins)) {
590 dev_err(dev, "invalid pin list in %s node", cfg_np->name);
591 return -EINVAL;
592 }
593
594 *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
595 if (!*pin_list) {
596 dev_err(dev, "failed to allocate memory for pin list\n");
597 return -ENOMEM;
598 }
599
600 of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
601 for (cnt = 0; cnt < pctl->npins; cnt++) {
602 if (pdesc[cnt].name) {
603 if (!strcmp(pin_name, pdesc[cnt].name)) {
604 (*pin_list)[idx++] = pdesc[cnt].number;
605 break;
606 }
607 }
608 }
609 if (cnt == pctl->npins) {
610 dev_err(dev, "pin %s not valid in %s node\n",
611 pin_name, cfg_np->name);
612 devm_kfree(dev, *pin_list);
613 return -EINVAL;
614 }
615 }
616
617 return 0;
618 }
619
620 /*
621 * Parse the information about all the available pin groups and pin functions
622 * from device node of the pin-controller. A pin group is formed with all
623 * the pins listed in the "samsung,pins" property.
624 */
625 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
626 struct samsung_pinctrl_drv_data *drvdata)
627 {
628 struct device *dev = &pdev->dev;
629 struct device_node *dev_np = dev->of_node;
630 struct device_node *cfg_np;
631 struct samsung_pin_group *groups, *grp;
632 struct samsung_pmx_func *functions, *func;
633 unsigned *pin_list;
634 unsigned int npins, grp_cnt, func_idx = 0;
635 char *gname, *fname;
636 int ret;
637
638 grp_cnt = of_get_child_count(dev_np);
639 if (!grp_cnt)
640 return -EINVAL;
641
642 groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
643 if (!groups) {
644 dev_err(dev, "failed allocate memory for ping group list\n");
645 return -EINVAL;
646 }
647 grp = groups;
648
649 functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
650 if (!functions) {
651 dev_err(dev, "failed to allocate memory for function list\n");
652 return -EINVAL;
653 }
654 func = functions;
655
656 /*
657 * Iterate over all the child nodes of the pin controller node
658 * and create pin groups and pin function lists.
659 */
660 for_each_child_of_node(dev_np, cfg_np) {
661 u32 function;
662 if (!of_find_property(cfg_np, "samsung,pins", NULL))
663 continue;
664
665 ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
666 &drvdata->pctl, &pin_list, &npins);
667 if (ret)
668 return ret;
669
670 /* derive pin group name from the node name */
671 gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
672 GFP_KERNEL);
673 if (!gname) {
674 dev_err(dev, "failed to alloc memory for group name\n");
675 return -ENOMEM;
676 }
677 sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
678
679 grp->name = gname;
680 grp->pins = pin_list;
681 grp->num_pins = npins;
682 of_property_read_u32(cfg_np, "samsung,pin-function", &function);
683 grp->func = function;
684 grp++;
685
686 if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
687 continue;
688
689 /* derive function name from the node name */
690 fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
691 GFP_KERNEL);
692 if (!fname) {
693 dev_err(dev, "failed to alloc memory for func name\n");
694 return -ENOMEM;
695 }
696 sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
697
698 func->name = fname;
699 func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
700 if (!func->groups) {
701 dev_err(dev, "failed to alloc memory for group list "
702 "in pin function");
703 return -ENOMEM;
704 }
705 func->groups[0] = gname;
706 func->num_groups = 1;
707 func++;
708 func_idx++;
709 }
710
711 drvdata->pin_groups = groups;
712 drvdata->nr_groups = grp_cnt;
713 drvdata->pmx_functions = functions;
714 drvdata->nr_functions = func_idx;
715
716 return 0;
717 }
718
719 /* register the pinctrl interface with the pinctrl subsystem */
720 static int samsung_pinctrl_register(struct platform_device *pdev,
721 struct samsung_pinctrl_drv_data *drvdata)
722 {
723 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
724 struct pinctrl_pin_desc *pindesc, *pdesc;
725 struct samsung_pin_bank *pin_bank;
726 char *pin_names;
727 int pin, bank, ret;
728
729 ctrldesc->name = "samsung-pinctrl";
730 ctrldesc->owner = THIS_MODULE;
731 ctrldesc->pctlops = &samsung_pctrl_ops;
732 ctrldesc->pmxops = &samsung_pinmux_ops;
733 ctrldesc->confops = &samsung_pinconf_ops;
734
735 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
736 drvdata->ctrl->nr_pins, GFP_KERNEL);
737 if (!pindesc) {
738 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
739 return -ENOMEM;
740 }
741 ctrldesc->pins = pindesc;
742 ctrldesc->npins = drvdata->ctrl->nr_pins;
743
744 /* dynamically populate the pin number and pin name for pindesc */
745 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
746 pdesc->number = pin + drvdata->ctrl->base;
747
748 /*
749 * allocate space for storing the dynamically generated names for all
750 * the pins which belong to this pin-controller.
751 */
752 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
753 drvdata->ctrl->nr_pins, GFP_KERNEL);
754 if (!pin_names) {
755 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
756 return -ENOMEM;
757 }
758
759 /* for each pin, the name of the pin is pin-bank name + pin number */
760 for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
761 pin_bank = &drvdata->ctrl->pin_banks[bank];
762 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
763 sprintf(pin_names, "%s-%d", pin_bank->name, pin);
764 pdesc = pindesc + pin_bank->pin_base + pin;
765 pdesc->name = pin_names;
766 pin_names += PIN_NAME_LENGTH;
767 }
768 }
769
770 drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
771 if (!drvdata->pctl_dev) {
772 dev_err(&pdev->dev, "could not register pinctrl driver\n");
773 return -EINVAL;
774 }
775
776 for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
777 pin_bank = &drvdata->ctrl->pin_banks[bank];
778 pin_bank->grange.name = pin_bank->name;
779 pin_bank->grange.id = bank;
780 pin_bank->grange.pin_base = pin_bank->pin_base;
781 pin_bank->grange.base = pin_bank->gpio_chip.base;
782 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
783 pin_bank->grange.gc = &pin_bank->gpio_chip;
784 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
785 }
786
787 ret = samsung_pinctrl_parse_dt(pdev, drvdata);
788 if (ret) {
789 pinctrl_unregister(drvdata->pctl_dev);
790 return ret;
791 }
792
793 return 0;
794 }
795
796 static const struct gpio_chip samsung_gpiolib_chip = {
797 .set = samsung_gpio_set,
798 .get = samsung_gpio_get,
799 .direction_input = samsung_gpio_direction_input,
800 .direction_output = samsung_gpio_direction_output,
801 .to_irq = samsung_gpio_to_irq,
802 .owner = THIS_MODULE,
803 };
804
805 /* register the gpiolib interface with the gpiolib subsystem */
806 static int samsung_gpiolib_register(struct platform_device *pdev,
807 struct samsung_pinctrl_drv_data *drvdata)
808 {
809 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
810 struct samsung_pin_bank *bank = ctrl->pin_banks;
811 struct gpio_chip *gc;
812 int ret;
813 int i;
814
815 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
816 bank->gpio_chip = samsung_gpiolib_chip;
817
818 gc = &bank->gpio_chip;
819 gc->base = ctrl->base + bank->pin_base;
820 gc->ngpio = bank->nr_pins;
821 gc->dev = &pdev->dev;
822 gc->of_node = bank->of_node;
823 gc->label = bank->name;
824
825 ret = gpiochip_add(gc);
826 if (ret) {
827 dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
828 gc->label, ret);
829 goto fail;
830 }
831 }
832
833 return 0;
834
835 fail:
836 for (--i, --bank; i >= 0; --i, --bank)
837 if (gpiochip_remove(&bank->gpio_chip))
838 dev_err(&pdev->dev, "gpio chip %s remove failed\n",
839 bank->gpio_chip.label);
840 return ret;
841 }
842
843 /* unregister the gpiolib interface with the gpiolib subsystem */
844 static int samsung_gpiolib_unregister(struct platform_device *pdev,
845 struct samsung_pinctrl_drv_data *drvdata)
846 {
847 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
848 struct samsung_pin_bank *bank = ctrl->pin_banks;
849 int ret = 0;
850 int i;
851
852 for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
853 ret = gpiochip_remove(&bank->gpio_chip);
854
855 if (ret)
856 dev_err(&pdev->dev, "gpio chip remove failed\n");
857
858 return ret;
859 }
860
861 static const struct of_device_id samsung_pinctrl_dt_match[];
862
863 /* retrieve the soc specific data */
864 static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
865 struct samsung_pinctrl_drv_data *d,
866 struct platform_device *pdev)
867 {
868 int id;
869 const struct of_device_id *match;
870 struct device_node *node = pdev->dev.of_node;
871 struct device_node *np;
872 struct samsung_pin_ctrl *ctrl;
873 struct samsung_pin_bank *bank;
874 int i;
875
876 id = of_alias_get_id(node, "pinctrl");
877 if (id < 0) {
878 dev_err(&pdev->dev, "failed to get alias id\n");
879 return NULL;
880 }
881 match = of_match_node(samsung_pinctrl_dt_match, node);
882 ctrl = (struct samsung_pin_ctrl *)match->data + id;
883
884 bank = ctrl->pin_banks;
885 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
886 spin_lock_init(&bank->slock);
887 bank->drvdata = d;
888 bank->pin_base = ctrl->nr_pins;
889 ctrl->nr_pins += bank->nr_pins;
890 }
891
892 for_each_child_of_node(node, np) {
893 if (!of_find_property(np, "gpio-controller", NULL))
894 continue;
895 bank = ctrl->pin_banks;
896 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
897 if (!strcmp(bank->name, np->name)) {
898 bank->of_node = np;
899 break;
900 }
901 }
902 }
903
904 ctrl->base = pin_base;
905 pin_base += ctrl->nr_pins;
906
907 return ctrl;
908 }
909
910 static int samsung_pinctrl_probe(struct platform_device *pdev)
911 {
912 struct samsung_pinctrl_drv_data *drvdata;
913 struct device *dev = &pdev->dev;
914 struct samsung_pin_ctrl *ctrl;
915 struct resource *res;
916 int ret;
917
918 if (!dev->of_node) {
919 dev_err(dev, "device tree node not found\n");
920 return -ENODEV;
921 }
922
923 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
924 if (!drvdata) {
925 dev_err(dev, "failed to allocate memory for driver's "
926 "private data\n");
927 return -ENOMEM;
928 }
929
930 ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
931 if (!ctrl) {
932 dev_err(&pdev->dev, "driver data not available\n");
933 return -EINVAL;
934 }
935 drvdata->ctrl = ctrl;
936 drvdata->dev = dev;
937
938 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
939 drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
940 if (IS_ERR(drvdata->virt_base))
941 return PTR_ERR(drvdata->virt_base);
942
943 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
944 if (res)
945 drvdata->irq = res->start;
946
947 ret = samsung_gpiolib_register(pdev, drvdata);
948 if (ret)
949 return ret;
950
951 ret = samsung_pinctrl_register(pdev, drvdata);
952 if (ret) {
953 samsung_gpiolib_unregister(pdev, drvdata);
954 return ret;
955 }
956
957 if (ctrl->eint_gpio_init)
958 ctrl->eint_gpio_init(drvdata);
959 if (ctrl->eint_wkup_init)
960 ctrl->eint_wkup_init(drvdata);
961
962 platform_set_drvdata(pdev, drvdata);
963
964 /* Add to the global list */
965 list_add_tail(&drvdata->node, &drvdata_list);
966
967 return 0;
968 }
969
970 #ifdef CONFIG_PM
971
972 /**
973 * samsung_pinctrl_suspend_dev - save pinctrl state for suspend for a device
974 *
975 * Save data for all banks handled by this device.
976 */
977 static void samsung_pinctrl_suspend_dev(
978 struct samsung_pinctrl_drv_data *drvdata)
979 {
980 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
981 void __iomem *virt_base = drvdata->virt_base;
982 int i;
983
984 for (i = 0; i < ctrl->nr_banks; i++) {
985 struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
986 void __iomem *reg = virt_base + bank->pctl_offset;
987
988 u8 *offs = bank->type->reg_offset;
989 u8 *widths = bank->type->fld_width;
990 enum pincfg_type type;
991
992 /* Registers without a powerdown config aren't lost */
993 if (!widths[PINCFG_TYPE_CON_PDN])
994 continue;
995
996 for (type = 0; type < PINCFG_TYPE_NUM; type++)
997 if (widths[type])
998 bank->pm_save[type] = readl(reg + offs[type]);
999
1000 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1001 /* Some banks have two config registers */
1002 bank->pm_save[PINCFG_TYPE_NUM] =
1003 readl(reg + offs[PINCFG_TYPE_FUNC] + 4);
1004 pr_debug("Save %s @ %p (con %#010x %08x)\n",
1005 bank->name, reg,
1006 bank->pm_save[PINCFG_TYPE_FUNC],
1007 bank->pm_save[PINCFG_TYPE_NUM]);
1008 } else {
1009 pr_debug("Save %s @ %p (con %#010x)\n", bank->name,
1010 reg, bank->pm_save[PINCFG_TYPE_FUNC]);
1011 }
1012 }
1013
1014 if (ctrl->suspend)
1015 ctrl->suspend(drvdata);
1016 }
1017
1018 /**
1019 * samsung_pinctrl_resume_dev - restore pinctrl state from suspend for a device
1020 *
1021 * Restore one of the banks that was saved during suspend.
1022 *
1023 * We don't bother doing anything complicated to avoid glitching lines since
1024 * we're called before pad retention is turned off.
1025 */
1026 static void samsung_pinctrl_resume_dev(struct samsung_pinctrl_drv_data *drvdata)
1027 {
1028 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
1029 void __iomem *virt_base = drvdata->virt_base;
1030 int i;
1031
1032 if (ctrl->resume)
1033 ctrl->resume(drvdata);
1034
1035 for (i = 0; i < ctrl->nr_banks; i++) {
1036 struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
1037 void __iomem *reg = virt_base + bank->pctl_offset;
1038
1039 u8 *offs = bank->type->reg_offset;
1040 u8 *widths = bank->type->fld_width;
1041 enum pincfg_type type;
1042
1043 /* Registers without a powerdown config aren't lost */
1044 if (!widths[PINCFG_TYPE_CON_PDN])
1045 continue;
1046
1047 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1048 /* Some banks have two config registers */
1049 pr_debug("%s @ %p (con %#010x %08x => %#010x %08x)\n",
1050 bank->name, reg,
1051 readl(reg + offs[PINCFG_TYPE_FUNC]),
1052 readl(reg + offs[PINCFG_TYPE_FUNC] + 4),
1053 bank->pm_save[PINCFG_TYPE_FUNC],
1054 bank->pm_save[PINCFG_TYPE_NUM]);
1055 writel(bank->pm_save[PINCFG_TYPE_NUM],
1056 reg + offs[PINCFG_TYPE_FUNC] + 4);
1057 } else {
1058 pr_debug("%s @ %p (con %#010x => %#010x)\n", bank->name,
1059 reg, readl(reg + offs[PINCFG_TYPE_FUNC]),
1060 bank->pm_save[PINCFG_TYPE_FUNC]);
1061 }
1062 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1063 if (widths[type])
1064 writel(bank->pm_save[type], reg + offs[type]);
1065 }
1066 }
1067
1068 /**
1069 * samsung_pinctrl_suspend - save pinctrl state for suspend
1070 *
1071 * Save data for all banks across all devices.
1072 */
1073 static int samsung_pinctrl_suspend(void)
1074 {
1075 struct samsung_pinctrl_drv_data *drvdata;
1076
1077 list_for_each_entry(drvdata, &drvdata_list, node) {
1078 samsung_pinctrl_suspend_dev(drvdata);
1079 }
1080
1081 return 0;
1082 }
1083
1084 /**
1085 * samsung_pinctrl_resume - restore pinctrl state for suspend
1086 *
1087 * Restore data for all banks across all devices.
1088 */
1089 static void samsung_pinctrl_resume(void)
1090 {
1091 struct samsung_pinctrl_drv_data *drvdata;
1092
1093 list_for_each_entry_reverse(drvdata, &drvdata_list, node) {
1094 samsung_pinctrl_resume_dev(drvdata);
1095 }
1096 }
1097
1098 #else
1099 #define samsung_pinctrl_suspend NULL
1100 #define samsung_pinctrl_resume NULL
1101 #endif
1102
1103 static struct syscore_ops samsung_pinctrl_syscore_ops = {
1104 .suspend = samsung_pinctrl_suspend,
1105 .resume = samsung_pinctrl_resume,
1106 };
1107
1108 static const struct of_device_id samsung_pinctrl_dt_match[] = {
1109 #ifdef CONFIG_PINCTRL_EXYNOS
1110 { .compatible = "samsung,exynos4210-pinctrl",
1111 .data = (void *)exynos4210_pin_ctrl },
1112 { .compatible = "samsung,exynos4x12-pinctrl",
1113 .data = (void *)exynos4x12_pin_ctrl },
1114 { .compatible = "samsung,exynos5250-pinctrl",
1115 .data = (void *)exynos5250_pin_ctrl },
1116 { .compatible = "samsung,exynos5420-pinctrl",
1117 .data = (void *)exynos5420_pin_ctrl },
1118 #endif
1119 #ifdef CONFIG_PINCTRL_S3C64XX
1120 { .compatible = "samsung,s3c64xx-pinctrl",
1121 .data = s3c64xx_pin_ctrl },
1122 #endif
1123 #ifdef CONFIG_PINCTRL_S3C24XX
1124 { .compatible = "samsung,s3c2412-pinctrl",
1125 .data = s3c2412_pin_ctrl },
1126 { .compatible = "samsung,s3c2416-pinctrl",
1127 .data = s3c2416_pin_ctrl },
1128 { .compatible = "samsung,s3c2440-pinctrl",
1129 .data = s3c2440_pin_ctrl },
1130 { .compatible = "samsung,s3c2450-pinctrl",
1131 .data = s3c2450_pin_ctrl },
1132 #endif
1133 {},
1134 };
1135 MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
1136
1137 static struct platform_driver samsung_pinctrl_driver = {
1138 .probe = samsung_pinctrl_probe,
1139 .driver = {
1140 .name = "samsung-pinctrl",
1141 .owner = THIS_MODULE,
1142 .of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
1143 },
1144 };
1145
1146 static int __init samsung_pinctrl_drv_register(void)
1147 {
1148 /*
1149 * Register syscore ops for save/restore of registers across suspend.
1150 * It's important to ensure that this driver is running at an earlier
1151 * initcall level than any arch-specific init calls that install syscore
1152 * ops that turn off pad retention (like exynos_pm_resume).
1153 */
1154 register_syscore_ops(&samsung_pinctrl_syscore_ops);
1155
1156 return platform_driver_register(&samsung_pinctrl_driver);
1157 }
1158 postcore_initcall(samsung_pinctrl_drv_register);
1159
1160 static void __exit samsung_pinctrl_drv_unregister(void)
1161 {
1162 platform_driver_unregister(&samsung_pinctrl_driver);
1163 }
1164 module_exit(samsung_pinctrl_drv_unregister);
1165
1166 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
1167 MODULE_DESCRIPTION("Samsung pinctrl driver");
1168 MODULE_LICENSE("GPL v2");
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