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>
32 #include "pinctrl-samsung.h"
34 #define GROUP_SUFFIX "-grp"
35 #define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
36 #define FUNCTION_SUFFIX "-mux"
37 #define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
39 /* list of all possible config options supported */
40 static struct pin_config {
42 unsigned int cfg_type;
44 { "samsung,pin-pud", PINCFG_TYPE_PUD },
45 { "samsung,pin-drv", PINCFG_TYPE_DRV },
46 { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
47 { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
50 static unsigned int pin_base;
52 static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
54 return container_of(gc, struct samsung_pin_bank, gpio_chip);
57 /* check if the selector is a valid pin group selector */
58 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
60 struct samsung_pinctrl_drv_data *drvdata;
62 drvdata = pinctrl_dev_get_drvdata(pctldev);
63 return drvdata->nr_groups;
66 /* return the name of the group selected by the group selector */
67 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
70 struct samsung_pinctrl_drv_data *drvdata;
72 drvdata = pinctrl_dev_get_drvdata(pctldev);
73 return drvdata->pin_groups[selector].name;
76 /* return the pin numbers associated with the specified group */
77 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
78 unsigned selector, const unsigned **pins, unsigned *num_pins)
80 struct samsung_pinctrl_drv_data *drvdata;
82 drvdata = pinctrl_dev_get_drvdata(pctldev);
83 *pins = drvdata->pin_groups[selector].pins;
84 *num_pins = drvdata->pin_groups[selector].num_pins;
88 /* create pinctrl_map entries by parsing device tree nodes */
89 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
90 struct device_node *np, struct pinctrl_map **maps,
93 struct device *dev = pctldev->dev;
94 struct pinctrl_map *map;
95 unsigned long *cfg = NULL;
97 int cfg_cnt = 0, map_cnt = 0, idx = 0;
99 /* count the number of config options specfied in the node */
100 for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
101 if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
106 * Find out the number of map entries to create. All the config options
107 * can be accomadated into a single config map entry.
111 if (of_find_property(np, "samsung,pin-function", NULL))
114 dev_err(dev, "node %s does not have either config or function "
115 "configurations\n", np->name);
119 /* Allocate memory for pin-map entries */
120 map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
122 dev_err(dev, "could not alloc memory for pin-maps\n");
128 * Allocate memory for pin group name. The pin group name is derived
129 * from the node name from which these map entries are be created.
131 gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
133 dev_err(dev, "failed to alloc memory for group name\n");
136 sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
139 * don't have config options? then skip over to creating function
145 /* Allocate memory for config entries */
146 cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
148 dev_err(dev, "failed to alloc memory for configs\n");
152 /* Prepare a list of config settings */
153 for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
155 if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
157 PINCFG_PACK(pcfgs[idx].cfg_type, value);
160 /* create the config map entry */
161 map[*nmaps].data.configs.group_or_pin = gname;
162 map[*nmaps].data.configs.configs = cfg;
163 map[*nmaps].data.configs.num_configs = cfg_cnt;
164 map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
168 /* create the function map entry */
169 if (of_find_property(np, "samsung,pin-function", NULL)) {
170 fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
172 dev_err(dev, "failed to alloc memory for func name\n");
175 sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
177 map[*nmaps].data.mux.group = gname;
178 map[*nmaps].data.mux.function = fname;
179 map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
195 /* free the memory allocated to hold the pin-map table */
196 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
197 struct pinctrl_map *map, unsigned num_maps)
201 for (idx = 0; idx < num_maps; idx++) {
202 if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
203 kfree(map[idx].data.mux.function);
205 kfree(map[idx].data.mux.group);
206 } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
207 kfree(map[idx].data.configs.configs);
209 kfree(map[idx].data.configs.group_or_pin);
216 /* list of pinctrl callbacks for the pinctrl core */
217 static struct pinctrl_ops samsung_pctrl_ops = {
218 .get_groups_count = samsung_get_group_count,
219 .get_group_name = samsung_get_group_name,
220 .get_group_pins = samsung_get_group_pins,
221 .dt_node_to_map = samsung_dt_node_to_map,
222 .dt_free_map = samsung_dt_free_map,
225 /* check if the selector is a valid pin function selector */
226 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
228 struct samsung_pinctrl_drv_data *drvdata;
230 drvdata = pinctrl_dev_get_drvdata(pctldev);
231 return drvdata->nr_functions;
234 /* return the name of the pin function specified */
235 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
238 struct samsung_pinctrl_drv_data *drvdata;
240 drvdata = pinctrl_dev_get_drvdata(pctldev);
241 return drvdata->pmx_functions[selector].name;
244 /* return the groups associated for the specified function selector */
245 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
246 unsigned selector, const char * const **groups,
247 unsigned * const num_groups)
249 struct samsung_pinctrl_drv_data *drvdata;
251 drvdata = pinctrl_dev_get_drvdata(pctldev);
252 *groups = drvdata->pmx_functions[selector].groups;
253 *num_groups = drvdata->pmx_functions[selector].num_groups;
258 * given a pin number that is local to a pin controller, find out the pin bank
259 * and the register base of the pin bank.
261 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
262 unsigned pin, void __iomem **reg, u32 *offset,
263 struct samsung_pin_bank **bank)
265 struct samsung_pin_bank *b;
267 b = drvdata->ctrl->pin_banks;
269 while ((pin >= b->pin_base) &&
270 ((b->pin_base + b->nr_pins - 1) < pin))
273 *reg = drvdata->virt_base + b->pctl_offset;
274 *offset = pin - b->pin_base;
278 /* some banks have two config registers in a single bank */
279 if (*offset * b->func_width > BITS_PER_LONG)
283 /* enable or disable a pinmux function */
284 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
285 unsigned group, bool enable)
287 struct samsung_pinctrl_drv_data *drvdata;
288 const unsigned int *pins;
289 struct samsung_pin_bank *bank;
291 u32 mask, shift, data, pin_offset, cnt;
293 drvdata = pinctrl_dev_get_drvdata(pctldev);
294 pins = drvdata->pin_groups[group].pins;
297 * for each pin in the pin group selected, program the correspoding pin
298 * pin function number in the config register.
300 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
301 pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base,
302 ®, &pin_offset, &bank);
303 mask = (1 << bank->func_width) - 1;
304 shift = pin_offset * bank->func_width;
307 data &= ~(mask << shift);
309 data |= drvdata->pin_groups[group].func << shift;
314 /* enable a specified pinmux by writing to registers */
315 static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
318 samsung_pinmux_setup(pctldev, selector, group, true);
322 /* disable a specified pinmux by writing to registers */
323 static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
324 unsigned selector, unsigned group)
326 samsung_pinmux_setup(pctldev, selector, group, false);
330 * The calls to gpio_direction_output() and gpio_direction_input()
331 * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
332 * function called from the gpiolib interface).
334 static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
335 struct pinctrl_gpio_range *range, unsigned offset, bool input)
337 struct samsung_pin_bank *bank;
338 struct samsung_pinctrl_drv_data *drvdata;
340 u32 data, pin_offset, mask, shift;
342 bank = gc_to_pin_bank(range->gc);
343 drvdata = pinctrl_dev_get_drvdata(pctldev);
345 pin_offset = offset - bank->pin_base;
346 reg = drvdata->virt_base + bank->pctl_offset;
348 mask = (1 << bank->func_width) - 1;
349 shift = pin_offset * bank->func_width;
352 data &= ~(mask << shift);
354 data |= FUNC_OUTPUT << shift;
359 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
360 static struct pinmux_ops samsung_pinmux_ops = {
361 .get_functions_count = samsung_get_functions_count,
362 .get_function_name = samsung_pinmux_get_fname,
363 .get_function_groups = samsung_pinmux_get_groups,
364 .enable = samsung_pinmux_enable,
365 .disable = samsung_pinmux_disable,
366 .gpio_set_direction = samsung_pinmux_gpio_set_direction,
369 /* set or get the pin config settings for a specified pin */
370 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
371 unsigned long *config, bool set)
373 struct samsung_pinctrl_drv_data *drvdata;
374 struct samsung_pin_bank *bank;
375 void __iomem *reg_base;
376 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
377 u32 data, width, pin_offset, mask, shift;
378 u32 cfg_value, cfg_reg;
380 drvdata = pinctrl_dev_get_drvdata(pctldev);
381 pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, ®_base,
385 case PINCFG_TYPE_PUD:
386 width = bank->pud_width;
389 case PINCFG_TYPE_DRV:
390 width = bank->drv_width;
393 case PINCFG_TYPE_CON_PDN:
394 width = bank->conpdn_width;
395 cfg_reg = CONPDN_REG;
397 case PINCFG_TYPE_PUD_PDN:
398 width = bank->pudpdn_width;
399 cfg_reg = PUDPDN_REG;
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);
426 /* set the pin config settings for a specified pin */
427 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
428 unsigned long config)
430 return samsung_pinconf_rw(pctldev, pin, &config, true);
433 /* get the pin config settings for a specified pin */
434 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
435 unsigned long *config)
437 return samsung_pinconf_rw(pctldev, pin, config, false);
440 /* set the pin config settings for a specified pin group */
441 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
442 unsigned group, unsigned long config)
444 struct samsung_pinctrl_drv_data *drvdata;
445 const unsigned int *pins;
448 drvdata = pinctrl_dev_get_drvdata(pctldev);
449 pins = drvdata->pin_groups[group].pins;
451 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
452 samsung_pinconf_set(pctldev, pins[cnt], config);
457 /* get the pin config settings for a specified pin group */
458 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
459 unsigned int group, unsigned long *config)
461 struct samsung_pinctrl_drv_data *drvdata;
462 const unsigned int *pins;
464 drvdata = pinctrl_dev_get_drvdata(pctldev);
465 pins = drvdata->pin_groups[group].pins;
466 samsung_pinconf_get(pctldev, pins[0], config);
470 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
471 static struct pinconf_ops samsung_pinconf_ops = {
472 .pin_config_get = samsung_pinconf_get,
473 .pin_config_set = samsung_pinconf_set,
474 .pin_config_group_get = samsung_pinconf_group_get,
475 .pin_config_group_set = samsung_pinconf_group_set,
478 /* gpiolib gpio_set callback function */
479 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
481 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
485 reg = bank->drvdata->virt_base + bank->pctl_offset;
487 data = readl(reg + DAT_REG);
488 data &= ~(1 << offset);
491 writel(data, reg + DAT_REG);
494 /* gpiolib gpio_get callback function */
495 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
499 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
501 reg = bank->drvdata->virt_base + bank->pctl_offset;
503 data = readl(reg + DAT_REG);
510 * gpiolib gpio_direction_input callback function. The setting of the pin
511 * mux function as 'gpio input' will be handled by the pinctrl susbsystem
514 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
516 return pinctrl_gpio_direction_input(gc->base + offset);
520 * gpiolib gpio_direction_output callback function. The setting of the pin
521 * mux function as 'gpio output' will be handled by the pinctrl susbsystem
524 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
527 samsung_gpio_set(gc, offset, value);
528 return pinctrl_gpio_direction_output(gc->base + offset);
532 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
533 * and a virtual IRQ, if not already present.
535 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
537 struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
540 if (!bank->irq_domain)
543 virq = irq_create_mapping(bank->irq_domain, offset);
545 return (virq) ? : -ENXIO;
549 * Parse the pin names listed in the 'samsung,pins' property and convert it
550 * into a list of gpio numbers are create a pin group from it.
552 static int samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
553 struct device_node *cfg_np,
554 struct pinctrl_desc *pctl,
555 unsigned int **pin_list,
558 struct device *dev = &pdev->dev;
559 struct property *prop;
560 struct pinctrl_pin_desc const *pdesc = pctl->pins;
561 unsigned int idx = 0, cnt;
562 const char *pin_name;
564 *npins = of_property_count_strings(cfg_np, "samsung,pins");
565 if (IS_ERR_VALUE(*npins)) {
566 dev_err(dev, "invalid pin list in %s node", cfg_np->name);
570 *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
572 dev_err(dev, "failed to allocate memory for pin list\n");
576 of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
577 for (cnt = 0; cnt < pctl->npins; cnt++) {
578 if (pdesc[cnt].name) {
579 if (!strcmp(pin_name, pdesc[cnt].name)) {
580 (*pin_list)[idx++] = pdesc[cnt].number;
585 if (cnt == pctl->npins) {
586 dev_err(dev, "pin %s not valid in %s node\n",
587 pin_name, cfg_np->name);
588 devm_kfree(dev, *pin_list);
597 * Parse the information about all the available pin groups and pin functions
598 * from device node of the pin-controller. A pin group is formed with all
599 * the pins listed in the "samsung,pins" property.
601 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
602 struct samsung_pinctrl_drv_data *drvdata)
604 struct device *dev = &pdev->dev;
605 struct device_node *dev_np = dev->of_node;
606 struct device_node *cfg_np;
607 struct samsung_pin_group *groups, *grp;
608 struct samsung_pmx_func *functions, *func;
610 unsigned int npins, grp_cnt, func_idx = 0;
614 grp_cnt = of_get_child_count(dev_np);
618 groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
620 dev_err(dev, "failed allocate memory for ping group list\n");
625 functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
627 dev_err(dev, "failed to allocate memory for function list\n");
633 * Iterate over all the child nodes of the pin controller node
634 * and create pin groups and pin function lists.
636 for_each_child_of_node(dev_np, cfg_np) {
638 if (!of_find_property(cfg_np, "samsung,pins", NULL))
641 ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
642 &drvdata->pctl, &pin_list, &npins);
646 /* derive pin group name from the node name */
647 gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
650 dev_err(dev, "failed to alloc memory for group name\n");
653 sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
656 grp->pins = pin_list;
657 grp->num_pins = npins;
658 of_property_read_u32(cfg_np, "samsung,pin-function", &function);
659 grp->func = function;
662 if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
665 /* derive function name from the node name */
666 fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
669 dev_err(dev, "failed to alloc memory for func name\n");
672 sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
675 func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
677 dev_err(dev, "failed to alloc memory for group list "
681 func->groups[0] = gname;
682 func->num_groups = 1;
687 drvdata->pin_groups = groups;
688 drvdata->nr_groups = grp_cnt;
689 drvdata->pmx_functions = functions;
690 drvdata->nr_functions = func_idx;
695 /* register the pinctrl interface with the pinctrl subsystem */
696 static int samsung_pinctrl_register(struct platform_device *pdev,
697 struct samsung_pinctrl_drv_data *drvdata)
699 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
700 struct pinctrl_pin_desc *pindesc, *pdesc;
701 struct samsung_pin_bank *pin_bank;
705 ctrldesc->name = "samsung-pinctrl";
706 ctrldesc->owner = THIS_MODULE;
707 ctrldesc->pctlops = &samsung_pctrl_ops;
708 ctrldesc->pmxops = &samsung_pinmux_ops;
709 ctrldesc->confops = &samsung_pinconf_ops;
711 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
712 drvdata->ctrl->nr_pins, GFP_KERNEL);
714 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
717 ctrldesc->pins = pindesc;
718 ctrldesc->npins = drvdata->ctrl->nr_pins;
719 ctrldesc->npins = drvdata->ctrl->nr_pins;
721 /* dynamically populate the pin number and pin name for pindesc */
722 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
723 pdesc->number = pin + drvdata->ctrl->base;
726 * allocate space for storing the dynamically generated names for all
727 * the pins which belong to this pin-controller.
729 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
730 drvdata->ctrl->nr_pins, GFP_KERNEL);
732 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
736 /* for each pin, the name of the pin is pin-bank name + pin number */
737 for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
738 pin_bank = &drvdata->ctrl->pin_banks[bank];
739 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
740 sprintf(pin_names, "%s-%d", pin_bank->name, pin);
741 pdesc = pindesc + pin_bank->pin_base + pin;
742 pdesc->name = pin_names;
743 pin_names += PIN_NAME_LENGTH;
747 drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
748 if (!drvdata->pctl_dev) {
749 dev_err(&pdev->dev, "could not register pinctrl driver\n");
753 for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
754 pin_bank = &drvdata->ctrl->pin_banks[bank];
755 pin_bank->grange.name = pin_bank->name;
756 pin_bank->grange.id = bank;
757 pin_bank->grange.pin_base = pin_bank->pin_base;
758 pin_bank->grange.base = pin_bank->gpio_chip.base;
759 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
760 pin_bank->grange.gc = &pin_bank->gpio_chip;
761 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
764 ret = samsung_pinctrl_parse_dt(pdev, drvdata);
766 pinctrl_unregister(drvdata->pctl_dev);
773 static const struct gpio_chip samsung_gpiolib_chip = {
774 .set = samsung_gpio_set,
775 .get = samsung_gpio_get,
776 .direction_input = samsung_gpio_direction_input,
777 .direction_output = samsung_gpio_direction_output,
778 .to_irq = samsung_gpio_to_irq,
779 .owner = THIS_MODULE,
782 /* register the gpiolib interface with the gpiolib subsystem */
783 static int samsung_gpiolib_register(struct platform_device *pdev,
784 struct samsung_pinctrl_drv_data *drvdata)
786 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
787 struct samsung_pin_bank *bank = ctrl->pin_banks;
788 struct gpio_chip *gc;
792 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
793 bank->gpio_chip = samsung_gpiolib_chip;
795 gc = &bank->gpio_chip;
796 gc->base = ctrl->base + bank->pin_base;
797 gc->ngpio = bank->nr_pins;
798 gc->dev = &pdev->dev;
799 gc->of_node = bank->of_node;
800 gc->label = bank->name;
802 ret = gpiochip_add(gc);
804 dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
813 for (--i, --bank; i >= 0; --i, --bank)
814 if (gpiochip_remove(&bank->gpio_chip))
815 dev_err(&pdev->dev, "gpio chip %s remove failed\n",
816 bank->gpio_chip.label);
820 /* unregister the gpiolib interface with the gpiolib subsystem */
821 static int samsung_gpiolib_unregister(struct platform_device *pdev,
822 struct samsung_pinctrl_drv_data *drvdata)
824 struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
825 struct samsung_pin_bank *bank = ctrl->pin_banks;
829 for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
830 ret = gpiochip_remove(&bank->gpio_chip);
833 dev_err(&pdev->dev, "gpio chip remove failed\n");
838 static const struct of_device_id samsung_pinctrl_dt_match[];
840 /* retrieve the soc specific data */
841 static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
842 struct samsung_pinctrl_drv_data *d,
843 struct platform_device *pdev)
846 const struct of_device_id *match;
847 struct device_node *node = pdev->dev.of_node;
848 struct device_node *np;
849 struct samsung_pin_ctrl *ctrl;
850 struct samsung_pin_bank *bank;
853 id = of_alias_get_id(node, "pinctrl");
855 dev_err(&pdev->dev, "failed to get alias id\n");
858 match = of_match_node(samsung_pinctrl_dt_match, node);
859 ctrl = (struct samsung_pin_ctrl *)match->data + id;
861 bank = ctrl->pin_banks;
862 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
864 bank->pin_base = ctrl->nr_pins;
865 ctrl->nr_pins += bank->nr_pins;
868 for_each_child_of_node(node, np) {
869 if (!of_find_property(np, "gpio-controller", NULL))
871 bank = ctrl->pin_banks;
872 for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
873 if (!strcmp(bank->name, np->name)) {
880 ctrl->base = pin_base;
881 pin_base += ctrl->nr_pins;
886 static int samsung_pinctrl_probe(struct platform_device *pdev)
888 struct samsung_pinctrl_drv_data *drvdata;
889 struct device *dev = &pdev->dev;
890 struct samsung_pin_ctrl *ctrl;
891 struct resource *res;
895 dev_err(dev, "device tree node not found\n");
899 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
901 dev_err(dev, "failed to allocate memory for driver's "
906 ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
908 dev_err(&pdev->dev, "driver data not available\n");
911 drvdata->ctrl = ctrl;
914 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
916 dev_err(dev, "cannot find IO resource\n");
920 drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res);
921 if (!drvdata->virt_base) {
922 dev_err(dev, "ioremap failed\n");
926 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
928 drvdata->irq = res->start;
930 ret = samsung_gpiolib_register(pdev, drvdata);
934 ret = samsung_pinctrl_register(pdev, drvdata);
936 samsung_gpiolib_unregister(pdev, drvdata);
940 if (ctrl->eint_gpio_init)
941 ctrl->eint_gpio_init(drvdata);
942 if (ctrl->eint_wkup_init)
943 ctrl->eint_wkup_init(drvdata);
945 platform_set_drvdata(pdev, drvdata);
949 static const struct of_device_id samsung_pinctrl_dt_match[] = {
950 { .compatible = "samsung,pinctrl-exynos4210",
951 .data = (void *)exynos4210_pin_ctrl },
952 { .compatible = "samsung,pinctrl-exynos4x12",
953 .data = (void *)exynos4x12_pin_ctrl },
956 MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
958 static struct platform_driver samsung_pinctrl_driver = {
959 .probe = samsung_pinctrl_probe,
961 .name = "samsung-pinctrl",
962 .owner = THIS_MODULE,
963 .of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
967 static int __init samsung_pinctrl_drv_register(void)
969 return platform_driver_register(&samsung_pinctrl_driver);
971 postcore_initcall(samsung_pinctrl_drv_register);
973 static void __exit samsung_pinctrl_drv_unregister(void)
975 platform_driver_unregister(&samsung_pinctrl_driver);
977 module_exit(samsung_pinctrl_drv_unregister);
979 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
980 MODULE_DESCRIPTION("Samsung pinctrl driver");
981 MODULE_LICENSE("GPL v2");