2 * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
6 * Copyright (c) 2012 Linaro Ltd
7 * http://www.linaro.org
9 * Author: Thomas Abraham <thomas.ab@samsung.com>
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.
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.
23 #include <linux/module.h>
24 #include <linux/platform_device.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>
33 #include "pinctrl-samsung.h"
35 #define GROUP_SUFFIX "-grp"
36 #define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
37 #define FUNCTION_SUFFIX "-mux"
38 #define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
40 /* list of all possible config options supported */
41 static struct pin_config {
43 unsigned int cfg_type;
45 { "samsung,pin-pud", PINCFG_TYPE_PUD },
46 { "samsung,pin-drv", PINCFG_TYPE_DRV },
47 { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
48 { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
51 static unsigned int pin_base;
53 static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
55 return container_of(gc, struct samsung_pin_bank, gpio_chip);
58 /* check if the selector is a valid pin group selector */
59 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
61 struct samsung_pinctrl_drv_data *drvdata;
63 drvdata = pinctrl_dev_get_drvdata(pctldev);
64 return drvdata->nr_groups;
67 /* return the name of the group selected by the group selector */
68 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
71 struct samsung_pinctrl_drv_data *drvdata;
73 drvdata = pinctrl_dev_get_drvdata(pctldev);
74 return drvdata->pin_groups[selector].name;
77 /* return the pin numbers associated with the specified group */
78 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
79 unsigned selector, const unsigned **pins, unsigned *num_pins)
81 struct samsung_pinctrl_drv_data *drvdata;
83 drvdata = pinctrl_dev_get_drvdata(pctldev);
84 *pins = drvdata->pin_groups[selector].pins;
85 *num_pins = drvdata->pin_groups[selector].num_pins;
89 /* create pinctrl_map entries by parsing device tree nodes */
90 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
91 struct device_node *np, struct pinctrl_map **maps,
94 struct device *dev = pctldev->dev;
95 struct pinctrl_map *map;
96 unsigned long *cfg = NULL;
98 int cfg_cnt = 0, map_cnt = 0, idx = 0;
100 /* count the number of config options specfied in the node */
101 for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
102 if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
107 * Find out the number of map entries to create. All the config options
108 * can be accomadated into a single config map entry.
112 if (of_find_property(np, "samsung,pin-function", NULL))
115 dev_err(dev, "node %s does not have either config or function "
116 "configurations\n", np->name);
120 /* Allocate memory for pin-map entries */
121 map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
123 dev_err(dev, "could not alloc memory for pin-maps\n");
129 * Allocate memory for pin group name. The pin group name is derived
130 * from the node name from which these map entries are be created.
132 gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
134 dev_err(dev, "failed to alloc memory for group name\n");
137 sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
140 * don't have config options? then skip over to creating function
146 /* Allocate memory for config entries */
147 cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
149 dev_err(dev, "failed to alloc memory for configs\n");
153 /* Prepare a list of config settings */
154 for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
156 if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
158 PINCFG_PACK(pcfgs[idx].cfg_type, value);
161 /* create the config map entry */
162 map[*nmaps].data.configs.group_or_pin = gname;
163 map[*nmaps].data.configs.configs = cfg;
164 map[*nmaps].data.configs.num_configs = cfg_cnt;
165 map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
169 /* create the function map entry */
170 if (of_find_property(np, "samsung,pin-function", NULL)) {
171 fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
173 dev_err(dev, "failed to alloc memory for func name\n");
176 sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
178 map[*nmaps].data.mux.group = gname;
179 map[*nmaps].data.mux.function = fname;
180 map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
196 /* free the memory allocated to hold the pin-map table */
197 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
198 struct pinctrl_map *map, unsigned num_maps)
202 for (idx = 0; idx < num_maps; idx++) {
203 if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
204 kfree(map[idx].data.mux.function);
206 kfree(map[idx].data.mux.group);
207 } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
208 kfree(map[idx].data.configs.configs);
210 kfree(map[idx].data.configs.group_or_pin);
217 /* list of pinctrl callbacks for the pinctrl core */
218 static const struct pinctrl_ops samsung_pctrl_ops = {
219 .get_groups_count = samsung_get_group_count,
220 .get_group_name = samsung_get_group_name,
221 .get_group_pins = samsung_get_group_pins,
222 .dt_node_to_map = samsung_dt_node_to_map,
223 .dt_free_map = samsung_dt_free_map,
226 /* check if the selector is a valid pin function selector */
227 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
229 struct samsung_pinctrl_drv_data *drvdata;
231 drvdata = pinctrl_dev_get_drvdata(pctldev);
232 return drvdata->nr_functions;
235 /* return the name of the pin function specified */
236 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
239 struct samsung_pinctrl_drv_data *drvdata;
241 drvdata = pinctrl_dev_get_drvdata(pctldev);
242 return drvdata->pmx_functions[selector].name;
245 /* return the groups associated for the specified function selector */
246 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
247 unsigned selector, const char * const **groups,
248 unsigned * const num_groups)
250 struct samsung_pinctrl_drv_data *drvdata;
252 drvdata = pinctrl_dev_get_drvdata(pctldev);
253 *groups = drvdata->pmx_functions[selector].groups;
254 *num_groups = drvdata->pmx_functions[selector].num_groups;
259 * given a pin number that is local to a pin controller, find out the pin bank
260 * and the register base of the pin bank.
262 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
263 unsigned pin, void __iomem **reg, u32 *offset,
264 struct samsung_pin_bank **bank)
266 struct samsung_pin_bank *b;
268 b = drvdata->ctrl->pin_banks;
270 while ((pin >= b->pin_base) &&
271 ((b->pin_base + b->nr_pins - 1) < pin))
274 *reg = drvdata->virt_base + b->pctl_offset;
275 *offset = pin - b->pin_base;
280 /* enable or disable a pinmux function */
281 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
282 unsigned group, bool enable)
284 struct samsung_pinctrl_drv_data *drvdata;
285 const unsigned int *pins;
286 struct samsung_pin_bank *bank;
288 u32 mask, shift, data, pin_offset, cnt;
291 drvdata = pinctrl_dev_get_drvdata(pctldev);
292 pins = drvdata->pin_groups[group].pins;
295 * for each pin in the pin group selected, program the correspoding pin
296 * pin function number in the config register.
298 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
299 struct samsung_pin_bank_type *type;
301 pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base,
302 ®, &pin_offset, &bank);
304 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
305 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
307 spin_lock_irqsave(&bank->slock, flags);
309 data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
310 data &= ~(mask << shift);
312 data |= drvdata->pin_groups[group].func << shift;
313 writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
315 spin_unlock_irqrestore(&bank->slock, flags);
319 /* enable a specified pinmux by writing to registers */
320 static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
323 samsung_pinmux_setup(pctldev, selector, group, true);
327 /* disable a specified pinmux by writing to registers */
328 static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
329 unsigned selector, unsigned group)
331 samsung_pinmux_setup(pctldev, selector, group, false);
335 * The calls to gpio_direction_output() and gpio_direction_input()
336 * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
337 * function called from the gpiolib interface).
339 static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
340 struct pinctrl_gpio_range *range, unsigned offset, bool input)
342 struct samsung_pin_bank_type *type;
343 struct samsung_pin_bank *bank;
344 struct samsung_pinctrl_drv_data *drvdata;
346 u32 data, pin_offset, mask, shift;
349 bank = gc_to_pin_bank(range->gc);
351 drvdata = pinctrl_dev_get_drvdata(pctldev);
353 pin_offset = offset - bank->pin_base;
354 reg = drvdata->virt_base + bank->pctl_offset +
355 type->reg_offset[PINCFG_TYPE_FUNC];
357 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
358 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
360 spin_lock_irqsave(&bank->slock, flags);
363 data &= ~(mask << shift);
365 data |= FUNC_OUTPUT << shift;
368 spin_unlock_irqrestore(&bank->slock, flags);
373 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
374 static const struct pinmux_ops samsung_pinmux_ops = {
375 .get_functions_count = samsung_get_functions_count,
376 .get_function_name = samsung_pinmux_get_fname,
377 .get_function_groups = samsung_pinmux_get_groups,
378 .enable = samsung_pinmux_enable,
379 .disable = samsung_pinmux_disable,
380 .gpio_set_direction = samsung_pinmux_gpio_set_direction,
383 /* set or get the pin config settings for a specified pin */
384 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
385 unsigned long *config, bool set)
387 struct samsung_pinctrl_drv_data *drvdata;
388 struct samsung_pin_bank_type *type;
389 struct samsung_pin_bank *bank;
390 void __iomem *reg_base;
391 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
392 u32 data, width, pin_offset, mask, shift;
393 u32 cfg_value, cfg_reg;
396 drvdata = pinctrl_dev_get_drvdata(pctldev);
397 pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, ®_base,
401 if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
404 width = type->fld_width[cfg_type];
405 cfg_reg = type->reg_offset[cfg_type];
407 spin_lock_irqsave(&bank->slock, flags);
409 mask = (1 << width) - 1;
410 shift = pin_offset * width;
411 data = readl(reg_base + cfg_reg);
414 cfg_value = PINCFG_UNPACK_VALUE(*config);
415 data &= ~(mask << shift);
416 data |= (cfg_value << shift);
417 writel(data, reg_base + cfg_reg);
421 *config = PINCFG_PACK(cfg_type, data);
424 spin_unlock_irqrestore(&bank->slock, flags);
429 /* set the pin config settings for a specified pin */
430 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
431 unsigned long config)
433 return samsung_pinconf_rw(pctldev, pin, &config, true);
436 /* get the pin config settings for a specified pin */
437 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
438 unsigned long *config)
440 return samsung_pinconf_rw(pctldev, pin, config, false);
443 /* set the pin config settings for a specified pin group */
444 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
445 unsigned group, unsigned long config)
447 struct samsung_pinctrl_drv_data *drvdata;
448 const unsigned int *pins;
451 drvdata = pinctrl_dev_get_drvdata(pctldev);
452 pins = drvdata->pin_groups[group].pins;
454 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
455 samsung_pinconf_set(pctldev, pins[cnt], config);
460 /* get the pin config settings for a specified pin group */
461 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
462 unsigned int group, unsigned long *config)
464 struct samsung_pinctrl_drv_data *drvdata;
465 const unsigned int *pins;
467 drvdata = pinctrl_dev_get_drvdata(pctldev);
468 pins = drvdata->pin_groups[group].pins;
469 samsung_pinconf_get(pctldev, pins[0], config);
473 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
474 static const struct pinconf_ops samsung_pinconf_ops = {
475 .pin_config_get = samsung_pinconf_get,
476 .pin_config_set = samsung_pinconf_set,
477 .pin_config_group_get = samsung_pinconf_group_get,
478 .pin_config_group_set = samsung_pinconf_group_set,
481 /* gpiolib gpio_set callback function */
482 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
484 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
485 struct samsung_pin_bank_type *type = bank->type;
490 reg = bank->drvdata->virt_base + bank->pctl_offset;
492 spin_lock_irqsave(&bank->slock, flags);
494 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
495 data &= ~(1 << offset);
498 writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
500 spin_unlock_irqrestore(&bank->slock, flags);
503 /* gpiolib gpio_get callback function */
504 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
508 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
509 struct samsung_pin_bank_type *type = bank->type;
511 reg = bank->drvdata->virt_base + bank->pctl_offset;
513 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
520 * gpiolib gpio_direction_input callback function. The setting of the pin
521 * mux function as 'gpio input' will be handled by the pinctrl susbsystem
524 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
526 return pinctrl_gpio_direction_input(gc->base + offset);
530 * gpiolib gpio_direction_output callback function. The setting of the pin
531 * mux function as 'gpio output' will be handled by the pinctrl susbsystem
534 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
537 samsung_gpio_set(gc, offset, value);
538 return pinctrl_gpio_direction_output(gc->base + offset);
542 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
543 * and a virtual IRQ, if not already present.
545 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
547 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
550 if (!bank->irq_domain)
553 virq = irq_create_mapping(bank->irq_domain, offset);
555 return (virq) ? : -ENXIO;
559 * Parse the pin names listed in the 'samsung,pins' property and convert it
560 * into a list of gpio numbers are create a pin group from it.
562 static int samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
563 struct device_node *cfg_np,
564 struct pinctrl_desc *pctl,
565 unsigned int **pin_list,
568 struct device *dev = &pdev->dev;
569 struct property *prop;
570 struct pinctrl_pin_desc const *pdesc = pctl->pins;
571 unsigned int idx = 0, cnt;
572 const char *pin_name;
574 *npins = of_property_count_strings(cfg_np, "samsung,pins");
575 if (IS_ERR_VALUE(*npins)) {
576 dev_err(dev, "invalid pin list in %s node", cfg_np->name);
580 *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
582 dev_err(dev, "failed to allocate memory for pin list\n");
586 of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
587 for (cnt = 0; cnt < pctl->npins; cnt++) {
588 if (pdesc[cnt].name) {
589 if (!strcmp(pin_name, pdesc[cnt].name)) {
590 (*pin_list)[idx++] = pdesc[cnt].number;
595 if (cnt == pctl->npins) {
596 dev_err(dev, "pin %s not valid in %s node\n",
597 pin_name, cfg_np->name);
598 devm_kfree(dev, *pin_list);
607 * Parse the information about all the available pin groups and pin functions
608 * from device node of the pin-controller. A pin group is formed with all
609 * the pins listed in the "samsung,pins" property.
611 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
612 struct samsung_pinctrl_drv_data *drvdata)
614 struct device *dev = &pdev->dev;
615 struct device_node *dev_np = dev->of_node;
616 struct device_node *cfg_np;
617 struct samsung_pin_group *groups, *grp;
618 struct samsung_pmx_func *functions, *func;
620 unsigned int npins, grp_cnt, func_idx = 0;
624 grp_cnt = of_get_child_count(dev_np);
628 groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
630 dev_err(dev, "failed allocate memory for ping group list\n");
635 functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
637 dev_err(dev, "failed to allocate memory for function list\n");
643 * Iterate over all the child nodes of the pin controller node
644 * and create pin groups and pin function lists.
646 for_each_child_of_node(dev_np, cfg_np) {
648 if (!of_find_property(cfg_np, "samsung,pins", NULL))
651 ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
652 &drvdata->pctl, &pin_list, &npins);
656 /* derive pin group name from the node name */
657 gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
660 dev_err(dev, "failed to alloc memory for group name\n");
663 sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
666 grp->pins = pin_list;
667 grp->num_pins = npins;
668 of_property_read_u32(cfg_np, "samsung,pin-function", &function);
669 grp->func = function;
672 if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
675 /* derive function name from the node name */
676 fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
679 dev_err(dev, "failed to alloc memory for func name\n");
682 sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
685 func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
687 dev_err(dev, "failed to alloc memory for group list "
691 func->groups[0] = gname;
692 func->num_groups = 1;
697 drvdata->pin_groups = groups;
698 drvdata->nr_groups = grp_cnt;
699 drvdata->pmx_functions = functions;
700 drvdata->nr_functions = func_idx;
705 /* register the pinctrl interface with the pinctrl subsystem */
706 static int samsung_pinctrl_register(struct platform_device *pdev,
707 struct samsung_pinctrl_drv_data *drvdata)
709 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
710 struct pinctrl_pin_desc *pindesc, *pdesc;
711 struct samsung_pin_bank *pin_bank;
715 ctrldesc->name = "samsung-pinctrl";
716 ctrldesc->owner = THIS_MODULE;
717 ctrldesc->pctlops = &samsung_pctrl_ops;
718 ctrldesc->pmxops = &samsung_pinmux_ops;
719 ctrldesc->confops = &samsung_pinconf_ops;
721 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
722 drvdata->ctrl->nr_pins, GFP_KERNEL);
724 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
727 ctrldesc->pins = pindesc;
728 ctrldesc->npins = drvdata->ctrl->nr_pins;
730 /* dynamically populate the pin number and pin name for pindesc */
731 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
732 pdesc->number = pin + drvdata->ctrl->base;
735 * allocate space for storing the dynamically generated names for all
736 * the pins which belong to this pin-controller.
738 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
739 drvdata->ctrl->nr_pins, GFP_KERNEL);
741 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
745 /* for each pin, the name of the pin is pin-bank name + pin number */
746 for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
747 pin_bank = &drvdata->ctrl->pin_banks[bank];
748 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
749 sprintf(pin_names, "%s-%d", pin_bank->name, pin);
750 pdesc = pindesc + pin_bank->pin_base + pin;
751 pdesc->name = pin_names;
752 pin_names += PIN_NAME_LENGTH;
756 drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
757 if (!drvdata->pctl_dev) {
758 dev_err(&pdev->dev, "could not register pinctrl driver\n");
762 for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
763 pin_bank = &drvdata->ctrl->pin_banks[bank];
764 pin_bank->grange.name = pin_bank->name;
765 pin_bank->grange.id = bank;
766 pin_bank->grange.pin_base = pin_bank->pin_base;
767 pin_bank->grange.base = pin_bank->gpio_chip.base;
768 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
769 pin_bank->grange.gc = &pin_bank->gpio_chip;
770 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
773 ret = samsung_pinctrl_parse_dt(pdev, drvdata);
775 pinctrl_unregister(drvdata->pctl_dev);
782 static const struct gpio_chip samsung_gpiolib_chip = {
783 .set = samsung_gpio_set,
784 .get = samsung_gpio_get,
785 .direction_input = samsung_gpio_direction_input,
786 .direction_output = samsung_gpio_direction_output,
787 .to_irq = samsung_gpio_to_irq,
788 .owner = THIS_MODULE,
791 /* register the gpiolib interface with the gpiolib subsystem */
792 static int samsung_gpiolib_register(struct platform_device *pdev,
793 struct samsung_pinctrl_drv_data *drvdata)
795 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
796 struct samsung_pin_bank *bank = ctrl->pin_banks;
797 struct gpio_chip *gc;
801 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
802 bank->gpio_chip = samsung_gpiolib_chip;
804 gc = &bank->gpio_chip;
805 gc->base = ctrl->base + bank->pin_base;
806 gc->ngpio = bank->nr_pins;
807 gc->dev = &pdev->dev;
808 gc->of_node = bank->of_node;
809 gc->label = bank->name;
811 ret = gpiochip_add(gc);
813 dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
822 for (--i, --bank; i >= 0; --i, --bank)
823 if (gpiochip_remove(&bank->gpio_chip))
824 dev_err(&pdev->dev, "gpio chip %s remove failed\n",
825 bank->gpio_chip.label);
829 /* unregister the gpiolib interface with the gpiolib subsystem */
830 static int samsung_gpiolib_unregister(struct platform_device *pdev,
831 struct samsung_pinctrl_drv_data *drvdata)
833 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
834 struct samsung_pin_bank *bank = ctrl->pin_banks;
838 for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
839 ret = gpiochip_remove(&bank->gpio_chip);
842 dev_err(&pdev->dev, "gpio chip remove failed\n");
847 static const struct of_device_id samsung_pinctrl_dt_match[];
849 /* retrieve the soc specific data */
850 static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
851 struct samsung_pinctrl_drv_data *d,
852 struct platform_device *pdev)
855 const struct of_device_id *match;
856 struct device_node *node = pdev->dev.of_node;
857 struct device_node *np;
858 struct samsung_pin_ctrl *ctrl;
859 struct samsung_pin_bank *bank;
862 id = of_alias_get_id(node, "pinctrl");
864 dev_err(&pdev->dev, "failed to get alias id\n");
867 match = of_match_node(samsung_pinctrl_dt_match, node);
868 ctrl = (struct samsung_pin_ctrl *)match->data + id;
870 bank = ctrl->pin_banks;
871 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
872 spin_lock_init(&bank->slock);
874 bank->pin_base = ctrl->nr_pins;
875 ctrl->nr_pins += bank->nr_pins;
878 for_each_child_of_node(node, np) {
879 if (!of_find_property(np, "gpio-controller", NULL))
881 bank = ctrl->pin_banks;
882 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
883 if (!strcmp(bank->name, np->name)) {
890 ctrl->base = pin_base;
891 pin_base += ctrl->nr_pins;
896 static int samsung_pinctrl_probe(struct platform_device *pdev)
898 struct samsung_pinctrl_drv_data *drvdata;
899 struct device *dev = &pdev->dev;
900 struct samsung_pin_ctrl *ctrl;
901 struct resource *res;
905 dev_err(dev, "device tree node not found\n");
909 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
911 dev_err(dev, "failed to allocate memory for driver's "
916 ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
918 dev_err(&pdev->dev, "driver data not available\n");
921 drvdata->ctrl = ctrl;
924 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
926 dev_err(dev, "cannot find IO resource\n");
930 drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
931 if (IS_ERR(drvdata->virt_base))
932 return PTR_ERR(drvdata->virt_base);
934 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
936 drvdata->irq = res->start;
938 ret = samsung_gpiolib_register(pdev, drvdata);
942 ret = samsung_pinctrl_register(pdev, drvdata);
944 samsung_gpiolib_unregister(pdev, drvdata);
948 if (ctrl->eint_gpio_init)
949 ctrl->eint_gpio_init(drvdata);
950 if (ctrl->eint_wkup_init)
951 ctrl->eint_wkup_init(drvdata);
953 platform_set_drvdata(pdev, drvdata);
957 static const struct of_device_id samsung_pinctrl_dt_match[] = {
958 #ifdef CONFIG_PINCTRL_EXYNOS
959 { .compatible = "samsung,exynos4210-pinctrl",
960 .data = (void *)exynos4210_pin_ctrl },
961 { .compatible = "samsung,exynos4x12-pinctrl",
962 .data = (void *)exynos4x12_pin_ctrl },
966 MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
968 static struct platform_driver samsung_pinctrl_driver = {
969 .probe = samsung_pinctrl_probe,
971 .name = "samsung-pinctrl",
972 .owner = THIS_MODULE,
973 .of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
977 static int __init samsung_pinctrl_drv_register(void)
979 return platform_driver_register(&samsung_pinctrl_driver);
981 postcore_initcall(samsung_pinctrl_drv_register);
983 static void __exit samsung_pinctrl_drv_unregister(void)
985 platform_driver_unregister(&samsung_pinctrl_driver);
987 module_exit(samsung_pinctrl_drv_unregister);
989 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
990 MODULE_DESCRIPTION("Samsung pinctrl driver");
991 MODULE_LICENSE("GPL v2");