2 * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's EXYNOS5440 SoC.
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18 #include <linux/gpio.h>
19 #include <linux/device.h>
20 #include <linux/pinctrl/pinctrl.h>
21 #include <linux/pinctrl/pinmux.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/interrupt.h>
24 #include <linux/irqdomain.h>
25 #include <linux/of_irq.h>
28 /* EXYNOS5440 GPIO and Pinctrl register offsets */
32 #define GPIO_TYPE 0x0C
42 #define EXYNOS5440_MAX_PINS 23
43 #define EXYNOS5440_MAX_GPIO_INT 8
44 #define PIN_NAME_LENGTH 10
46 #define GROUP_SUFFIX "-grp"
47 #define GSUFFIX_LEN sizeof(GROUP_SUFFIX)
48 #define FUNCTION_SUFFIX "-mux"
49 #define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX)
52 * pin configuration type and its value are packed together into a 16-bits.
53 * The upper 8-bits represent the configuration type and the lower 8-bits
54 * hold the value of the configuration type.
56 #define PINCFG_TYPE_MASK 0xFF
57 #define PINCFG_VALUE_SHIFT 8
58 #define PINCFG_VALUE_MASK (0xFF << PINCFG_VALUE_SHIFT)
59 #define PINCFG_PACK(type, value) (((value) << PINCFG_VALUE_SHIFT) | type)
60 #define PINCFG_UNPACK_TYPE(cfg) ((cfg) & PINCFG_TYPE_MASK)
61 #define PINCFG_UNPACK_VALUE(cfg) (((cfg) & PINCFG_VALUE_MASK) >> \
65 * enum pincfg_type - possible pin configuration types supported.
66 * @PINCFG_TYPE_PUD: Pull up/down configuration.
67 * @PINCFG_TYPE_DRV: Drive strength configuration.
68 * @PINCFG_TYPE_SKEW_RATE: Skew rate configuration.
69 * @PINCFG_TYPE_INPUT_TYPE: Pin input type configuration.
74 PINCFG_TYPE_SKEW_RATE,
75 PINCFG_TYPE_INPUT_TYPE
79 * struct exynos5440_pin_group: represent group of pins for pincfg setting.
80 * @name: name of the pin group, used to lookup the group.
81 * @pins: the pins included in this group.
82 * @num_pins: number of pins included in this group.
84 struct exynos5440_pin_group {
86 const unsigned int *pins;
91 * struct exynos5440_pmx_func: represent a pin function.
92 * @name: name of the pin function, used to lookup the function.
93 * @groups: one or more names of pin groups that provide this function.
94 * @num_groups: number of groups included in @groups.
95 * @function: the function number to be programmed when selected.
97 struct exynos5440_pmx_func {
101 unsigned long function;
105 * struct exynos5440_pinctrl_priv_data: driver's private runtime data.
106 * @reg_base: ioremapped based address of the register space.
107 * @gc: gpio chip registered with gpiolib.
108 * @pin_groups: list of pin groups parsed from device tree.
109 * @nr_groups: number of pin groups available.
110 * @pmx_functions: list of pin functions parsed from device tree.
111 * @nr_functions: number of pin functions available.
113 struct exynos5440_pinctrl_priv_data {
114 void __iomem *reg_base;
115 struct gpio_chip *gc;
116 struct irq_domain *irq_domain;
118 const struct exynos5440_pin_group *pin_groups;
119 unsigned int nr_groups;
120 const struct exynos5440_pmx_func *pmx_functions;
121 unsigned int nr_functions;
125 * struct exynos5440_gpio_intr_data: private data for gpio interrupts.
126 * @priv: driver's private runtime data.
127 * @gpio_int: gpio interrupt number.
129 struct exynos5440_gpio_intr_data {
130 struct exynos5440_pinctrl_priv_data *priv;
131 unsigned int gpio_int;
134 /* list of all possible config options supported */
135 static struct pin_config {
137 unsigned int cfg_type;
139 { "samsung,exynos5440-pin-pud", PINCFG_TYPE_PUD },
140 { "samsung,exynos5440-pin-drv", PINCFG_TYPE_DRV },
141 { "samsung,exynos5440-pin-skew-rate", PINCFG_TYPE_SKEW_RATE },
142 { "samsung,exynos5440-pin-input-type", PINCFG_TYPE_INPUT_TYPE },
145 /* check if the selector is a valid pin group selector */
146 static int exynos5440_get_group_count(struct pinctrl_dev *pctldev)
148 struct exynos5440_pinctrl_priv_data *priv;
150 priv = pinctrl_dev_get_drvdata(pctldev);
151 return priv->nr_groups;
154 /* return the name of the group selected by the group selector */
155 static const char *exynos5440_get_group_name(struct pinctrl_dev *pctldev,
158 struct exynos5440_pinctrl_priv_data *priv;
160 priv = pinctrl_dev_get_drvdata(pctldev);
161 return priv->pin_groups[selector].name;
164 /* return the pin numbers associated with the specified group */
165 static int exynos5440_get_group_pins(struct pinctrl_dev *pctldev,
166 unsigned selector, const unsigned **pins, unsigned *num_pins)
168 struct exynos5440_pinctrl_priv_data *priv;
170 priv = pinctrl_dev_get_drvdata(pctldev);
171 *pins = priv->pin_groups[selector].pins;
172 *num_pins = priv->pin_groups[selector].num_pins;
176 /* create pinctrl_map entries by parsing device tree nodes */
177 static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
178 struct device_node *np, struct pinctrl_map **maps,
181 struct device *dev = pctldev->dev;
182 struct pinctrl_map *map;
183 unsigned long *cfg = NULL;
185 int cfg_cnt = 0, map_cnt = 0, idx = 0;
187 /* count the number of config options specfied in the node */
188 for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++)
189 if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
193 * Find out the number of map entries to create. All the config options
194 * can be accomadated into a single config map entry.
198 if (of_find_property(np, "samsung,exynos5440-pin-function", NULL))
201 dev_err(dev, "node %s does not have either config or function "
202 "configurations\n", np->name);
206 /* Allocate memory for pin-map entries */
207 map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
209 dev_err(dev, "could not alloc memory for pin-maps\n");
215 * Allocate memory for pin group name. The pin group name is derived
216 * from the node name from which these map entries are be created.
218 gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
220 dev_err(dev, "failed to alloc memory for group name\n");
223 snprintf(gname, strlen(np->name) + 4, "%s%s", np->name, GROUP_SUFFIX);
226 * don't have config options? then skip over to creating function
232 /* Allocate memory for config entries */
233 cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
235 dev_err(dev, "failed to alloc memory for configs\n");
239 /* Prepare a list of config settings */
240 for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
242 if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
244 PINCFG_PACK(pcfgs[idx].cfg_type, value);
247 /* create the config map entry */
248 map[*nmaps].data.configs.group_or_pin = gname;
249 map[*nmaps].data.configs.configs = cfg;
250 map[*nmaps].data.configs.num_configs = cfg_cnt;
251 map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
255 /* create the function map entry */
256 if (of_find_property(np, "samsung,exynos5440-pin-function", NULL)) {
257 fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
259 dev_err(dev, "failed to alloc memory for func name\n");
262 snprintf(fname, strlen(np->name) + 4, "%s%s", np->name,
265 map[*nmaps].data.mux.group = gname;
266 map[*nmaps].data.mux.function = fname;
267 map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
283 /* free the memory allocated to hold the pin-map table */
284 static void exynos5440_dt_free_map(struct pinctrl_dev *pctldev,
285 struct pinctrl_map *map, unsigned num_maps)
289 for (idx = 0; idx < num_maps; idx++) {
290 if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
291 kfree(map[idx].data.mux.function);
293 kfree(map[idx].data.mux.group);
294 } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
295 kfree(map[idx].data.configs.configs);
297 kfree(map[idx].data.configs.group_or_pin);
304 /* list of pinctrl callbacks for the pinctrl core */
305 static const struct pinctrl_ops exynos5440_pctrl_ops = {
306 .get_groups_count = exynos5440_get_group_count,
307 .get_group_name = exynos5440_get_group_name,
308 .get_group_pins = exynos5440_get_group_pins,
309 .dt_node_to_map = exynos5440_dt_node_to_map,
310 .dt_free_map = exynos5440_dt_free_map,
313 /* check if the selector is a valid pin function selector */
314 static int exynos5440_get_functions_count(struct pinctrl_dev *pctldev)
316 struct exynos5440_pinctrl_priv_data *priv;
318 priv = pinctrl_dev_get_drvdata(pctldev);
319 return priv->nr_functions;
322 /* return the name of the pin function specified */
323 static const char *exynos5440_pinmux_get_fname(struct pinctrl_dev *pctldev,
326 struct exynos5440_pinctrl_priv_data *priv;
328 priv = pinctrl_dev_get_drvdata(pctldev);
329 return priv->pmx_functions[selector].name;
332 /* return the groups associated for the specified function selector */
333 static int exynos5440_pinmux_get_groups(struct pinctrl_dev *pctldev,
334 unsigned selector, const char * const **groups,
335 unsigned * const num_groups)
337 struct exynos5440_pinctrl_priv_data *priv;
339 priv = pinctrl_dev_get_drvdata(pctldev);
340 *groups = priv->pmx_functions[selector].groups;
341 *num_groups = priv->pmx_functions[selector].num_groups;
345 /* enable or disable a pinmux function */
346 static void exynos5440_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
347 unsigned group, bool enable)
349 struct exynos5440_pinctrl_priv_data *priv;
354 priv = pinctrl_dev_get_drvdata(pctldev);
355 base = priv->reg_base;
356 function = priv->pmx_functions[selector].function;
358 data = readl(base + GPIO_MUX);
360 data |= (1 << function);
362 data &= ~(1 << function);
363 writel(data, base + GPIO_MUX);
366 /* enable a specified pinmux by writing to registers */
367 static int exynos5440_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
370 exynos5440_pinmux_setup(pctldev, selector, group, true);
375 * The calls to gpio_direction_output() and gpio_direction_input()
376 * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
377 * function called from the gpiolib interface).
379 static int exynos5440_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
380 struct pinctrl_gpio_range *range, unsigned offset, bool input)
385 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
386 static const struct pinmux_ops exynos5440_pinmux_ops = {
387 .get_functions_count = exynos5440_get_functions_count,
388 .get_function_name = exynos5440_pinmux_get_fname,
389 .get_function_groups = exynos5440_pinmux_get_groups,
390 .enable = exynos5440_pinmux_enable,
391 .gpio_set_direction = exynos5440_pinmux_gpio_set_direction,
394 /* set the pin config settings for a specified pin */
395 static int exynos5440_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
396 unsigned long *configs,
397 unsigned num_configs)
399 struct exynos5440_pinctrl_priv_data *priv;
401 enum pincfg_type cfg_type;
406 priv = pinctrl_dev_get_drvdata(pctldev);
407 base = priv->reg_base;
409 for (i = 0; i < num_configs; i++) {
410 cfg_type = PINCFG_UNPACK_TYPE(configs[i]);
411 cfg_value = PINCFG_UNPACK_VALUE(configs[i]);
414 case PINCFG_TYPE_PUD:
415 /* first set pull enable/disable bit */
416 data = readl(base + GPIO_PE);
420 writel(data, base + GPIO_PE);
422 /* then set pull up/down bit */
423 data = readl(base + GPIO_PS);
427 writel(data, base + GPIO_PS);
430 case PINCFG_TYPE_DRV:
431 /* set the first bit of the drive strength */
432 data = readl(base + GPIO_DS0);
434 data |= ((cfg_value & 1) << pin);
435 writel(data, base + GPIO_DS0);
438 /* set the second bit of the driver strength */
439 data = readl(base + GPIO_DS1);
441 data |= ((cfg_value & 1) << pin);
442 writel(data, base + GPIO_DS1);
444 case PINCFG_TYPE_SKEW_RATE:
445 data = readl(base + GPIO_SR);
447 data |= ((cfg_value & 1) << pin);
448 writel(data, base + GPIO_SR);
450 case PINCFG_TYPE_INPUT_TYPE:
451 data = readl(base + GPIO_TYPE);
453 data |= ((cfg_value & 1) << pin);
454 writel(data, base + GPIO_TYPE);
460 } /* for each config */
465 /* get the pin config settings for a specified pin */
466 static int exynos5440_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
467 unsigned long *config)
469 struct exynos5440_pinctrl_priv_data *priv;
471 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
474 priv = pinctrl_dev_get_drvdata(pctldev);
475 base = priv->reg_base;
478 case PINCFG_TYPE_PUD:
479 data = readl(base + GPIO_PE);
480 data = (data >> pin) & 1;
484 *config = ((readl(base + GPIO_PS) >> pin) & 1) + 1;
486 case PINCFG_TYPE_DRV:
487 data = readl(base + GPIO_DS0);
488 data = (data >> pin) & 1;
490 data = readl(base + GPIO_DS1);
491 data = (data >> pin) & 1;
492 *config |= (data << 1);
494 case PINCFG_TYPE_SKEW_RATE:
495 data = readl(base + GPIO_SR);
496 *config = (data >> pin) & 1;
498 case PINCFG_TYPE_INPUT_TYPE:
499 data = readl(base + GPIO_TYPE);
500 *config = (data >> pin) & 1;
510 /* set the pin config settings for a specified pin group */
511 static int exynos5440_pinconf_group_set(struct pinctrl_dev *pctldev,
512 unsigned group, unsigned long *configs,
513 unsigned num_configs)
515 struct exynos5440_pinctrl_priv_data *priv;
516 const unsigned int *pins;
519 priv = pinctrl_dev_get_drvdata(pctldev);
520 pins = priv->pin_groups[group].pins;
522 for (cnt = 0; cnt < priv->pin_groups[group].num_pins; cnt++)
523 exynos5440_pinconf_set(pctldev, pins[cnt], configs,
529 /* get the pin config settings for a specified pin group */
530 static int exynos5440_pinconf_group_get(struct pinctrl_dev *pctldev,
531 unsigned int group, unsigned long *config)
533 struct exynos5440_pinctrl_priv_data *priv;
534 const unsigned int *pins;
536 priv = pinctrl_dev_get_drvdata(pctldev);
537 pins = priv->pin_groups[group].pins;
538 exynos5440_pinconf_get(pctldev, pins[0], config);
542 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
543 static const struct pinconf_ops exynos5440_pinconf_ops = {
544 .pin_config_get = exynos5440_pinconf_get,
545 .pin_config_set = exynos5440_pinconf_set,
546 .pin_config_group_get = exynos5440_pinconf_group_get,
547 .pin_config_group_set = exynos5440_pinconf_group_set,
550 /* gpiolib gpio_set callback function */
551 static void exynos5440_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
553 struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
554 void __iomem *base = priv->reg_base;
557 data = readl(base + GPIO_VAL);
558 data &= ~(1 << offset);
561 writel(data, base + GPIO_VAL);
564 /* gpiolib gpio_get callback function */
565 static int exynos5440_gpio_get(struct gpio_chip *gc, unsigned offset)
567 struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
568 void __iomem *base = priv->reg_base;
571 data = readl(base + GPIO_IN);
577 /* gpiolib gpio_direction_input callback function */
578 static int exynos5440_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
580 struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
581 void __iomem *base = priv->reg_base;
584 /* first disable the data output enable on this pin */
585 data = readl(base + GPIO_OE);
586 data &= ~(1 << offset);
587 writel(data, base + GPIO_OE);
589 /* now enable input on this pin */
590 data = readl(base + GPIO_IE);
592 writel(data, base + GPIO_IE);
596 /* gpiolib gpio_direction_output callback function */
597 static int exynos5440_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
600 struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
601 void __iomem *base = priv->reg_base;
604 exynos5440_gpio_set(gc, offset, value);
606 /* first disable the data input enable on this pin */
607 data = readl(base + GPIO_IE);
608 data &= ~(1 << offset);
609 writel(data, base + GPIO_IE);
611 /* now enable output on this pin */
612 data = readl(base + GPIO_OE);
614 writel(data, base + GPIO_OE);
618 /* gpiolib gpio_to_irq callback function */
619 static int exynos5440_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
621 struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
624 if (offset < 16 || offset > 23)
627 if (!priv->irq_domain)
630 virq = irq_create_mapping(priv->irq_domain, offset - 16);
631 return virq ? : -ENXIO;
634 /* parse the pin numbers listed in the 'samsung,exynos5440-pins' property */
635 static int exynos5440_pinctrl_parse_dt_pins(struct platform_device *pdev,
636 struct device_node *cfg_np, unsigned int **pin_list,
639 struct device *dev = &pdev->dev;
640 struct property *prop;
642 prop = of_find_property(cfg_np, "samsung,exynos5440-pins", NULL);
646 *npins = prop->length / sizeof(unsigned long);
648 dev_err(dev, "invalid pin list in %s node", cfg_np->name);
652 *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
654 dev_err(dev, "failed to allocate memory for pin list\n");
658 return of_property_read_u32_array(cfg_np, "samsung,exynos5440-pins",
663 * Parse the information about all the available pin groups and pin functions
664 * from device node of the pin-controller.
666 static int exynos5440_pinctrl_parse_dt(struct platform_device *pdev,
667 struct exynos5440_pinctrl_priv_data *priv)
669 struct device *dev = &pdev->dev;
670 struct device_node *dev_np = dev->of_node;
671 struct device_node *cfg_np;
672 struct exynos5440_pin_group *groups, *grp;
673 struct exynos5440_pmx_func *functions, *func;
675 unsigned int npins, grp_cnt, func_idx = 0;
679 grp_cnt = of_get_child_count(dev_np);
683 groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
685 dev_err(dev, "failed allocate memory for ping group list\n");
690 functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
692 dev_err(dev, "failed to allocate memory for function list\n");
698 * Iterate over all the child nodes of the pin controller node
699 * and create pin groups and pin function lists.
701 for_each_child_of_node(dev_np, cfg_np) {
704 ret = exynos5440_pinctrl_parse_dt_pins(pdev, cfg_np,
708 goto skip_to_pin_function;
711 /* derive pin group name from the node name */
712 gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
715 dev_err(dev, "failed to alloc memory for group name\n");
718 snprintf(gname, strlen(cfg_np->name) + 4, "%s%s", cfg_np->name,
722 grp->pins = pin_list;
723 grp->num_pins = npins;
726 skip_to_pin_function:
727 ret = of_property_read_u32(cfg_np, "samsung,exynos5440-pin-function",
732 /* derive function name from the node name */
733 fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
736 dev_err(dev, "failed to alloc memory for func name\n");
739 snprintf(fname, strlen(cfg_np->name) + 4, "%s%s", cfg_np->name,
743 func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
745 dev_err(dev, "failed to alloc memory for group list "
749 func->groups[0] = gname;
750 func->num_groups = gname ? 1 : 0;
751 func->function = function;
756 priv->pin_groups = groups;
757 priv->nr_groups = grp_cnt;
758 priv->pmx_functions = functions;
759 priv->nr_functions = func_idx;
763 /* register the pinctrl interface with the pinctrl subsystem */
764 static int exynos5440_pinctrl_register(struct platform_device *pdev,
765 struct exynos5440_pinctrl_priv_data *priv)
767 struct device *dev = &pdev->dev;
768 struct pinctrl_desc *ctrldesc;
769 struct pinctrl_dev *pctl_dev;
770 struct pinctrl_pin_desc *pindesc, *pdesc;
771 struct pinctrl_gpio_range grange;
775 ctrldesc = devm_kzalloc(dev, sizeof(*ctrldesc), GFP_KERNEL);
777 dev_err(dev, "could not allocate memory for pinctrl desc\n");
781 ctrldesc->name = "exynos5440-pinctrl";
782 ctrldesc->owner = THIS_MODULE;
783 ctrldesc->pctlops = &exynos5440_pctrl_ops;
784 ctrldesc->pmxops = &exynos5440_pinmux_ops;
785 ctrldesc->confops = &exynos5440_pinconf_ops;
787 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
788 EXYNOS5440_MAX_PINS, GFP_KERNEL);
790 dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
793 ctrldesc->pins = pindesc;
794 ctrldesc->npins = EXYNOS5440_MAX_PINS;
796 /* dynamically populate the pin number and pin name for pindesc */
797 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
801 * allocate space for storing the dynamically generated names for all
802 * the pins which belong to this pin-controller.
804 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
805 ctrldesc->npins, GFP_KERNEL);
807 dev_err(&pdev->dev, "mem alloc for pin names failed\n");
811 /* for each pin, set the name of the pin */
812 for (pin = 0; pin < ctrldesc->npins; pin++) {
813 snprintf(pin_names, 6, "gpio%02d", pin);
814 pdesc = pindesc + pin;
815 pdesc->name = pin_names;
816 pin_names += PIN_NAME_LENGTH;
819 ret = exynos5440_pinctrl_parse_dt(pdev, priv);
823 pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, priv);
825 dev_err(&pdev->dev, "could not register pinctrl driver\n");
829 grange.name = "exynos5440-pctrl-gpio-range";
832 grange.npins = EXYNOS5440_MAX_PINS;
833 grange.gc = priv->gc;
834 pinctrl_add_gpio_range(pctl_dev, &grange);
838 /* register the gpiolib interface with the gpiolib subsystem */
839 static int exynos5440_gpiolib_register(struct platform_device *pdev,
840 struct exynos5440_pinctrl_priv_data *priv)
842 struct gpio_chip *gc;
845 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
847 dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n");
853 gc->ngpio = EXYNOS5440_MAX_PINS;
854 gc->dev = &pdev->dev;
855 gc->set = exynos5440_gpio_set;
856 gc->get = exynos5440_gpio_get;
857 gc->direction_input = exynos5440_gpio_direction_input;
858 gc->direction_output = exynos5440_gpio_direction_output;
859 gc->to_irq = exynos5440_gpio_to_irq;
860 gc->label = "gpiolib-exynos5440";
861 gc->owner = THIS_MODULE;
862 ret = gpiochip_add(gc);
864 dev_err(&pdev->dev, "failed to register gpio_chip %s, error "
865 "code: %d\n", gc->label, ret);
872 /* unregister the gpiolib interface with the gpiolib subsystem */
873 static int exynos5440_gpiolib_unregister(struct platform_device *pdev,
874 struct exynos5440_pinctrl_priv_data *priv)
876 int ret = gpiochip_remove(priv->gc);
878 dev_err(&pdev->dev, "gpio chip remove failed\n");
884 static void exynos5440_gpio_irq_unmask(struct irq_data *irqd)
886 struct exynos5440_pinctrl_priv_data *d;
887 unsigned long gpio_int;
889 d = irq_data_get_irq_chip_data(irqd);
890 gpio_int = readl(d->reg_base + GPIO_INT);
891 gpio_int |= 1 << irqd->hwirq;
892 writel(gpio_int, d->reg_base + GPIO_INT);
895 static void exynos5440_gpio_irq_mask(struct irq_data *irqd)
897 struct exynos5440_pinctrl_priv_data *d;
898 unsigned long gpio_int;
900 d = irq_data_get_irq_chip_data(irqd);
901 gpio_int = readl(d->reg_base + GPIO_INT);
902 gpio_int &= ~(1 << irqd->hwirq);
903 writel(gpio_int, d->reg_base + GPIO_INT);
906 /* irq_chip for gpio interrupts */
907 static struct irq_chip exynos5440_gpio_irq_chip = {
908 .name = "exynos5440_gpio_irq_chip",
909 .irq_unmask = exynos5440_gpio_irq_unmask,
910 .irq_mask = exynos5440_gpio_irq_mask,
913 /* interrupt handler for GPIO interrupts 0..7 */
914 static irqreturn_t exynos5440_gpio_irq(int irq, void *data)
916 struct exynos5440_gpio_intr_data *intd = data;
917 struct exynos5440_pinctrl_priv_data *d = intd->priv;
920 virq = irq_linear_revmap(d->irq_domain, intd->gpio_int);
923 generic_handle_irq(virq);
927 static int exynos5440_gpio_irq_map(struct irq_domain *h, unsigned int virq,
930 struct exynos5440_pinctrl_priv_data *d = h->host_data;
932 irq_set_chip_data(virq, d);
933 irq_set_chip_and_handler(virq, &exynos5440_gpio_irq_chip,
935 set_irq_flags(virq, IRQF_VALID);
939 /* irq domain callbacks for gpio interrupt controller */
940 static const struct irq_domain_ops exynos5440_gpio_irqd_ops = {
941 .map = exynos5440_gpio_irq_map,
942 .xlate = irq_domain_xlate_twocell,
945 /* setup handling of gpio interrupts */
946 static int exynos5440_gpio_irq_init(struct platform_device *pdev,
947 struct exynos5440_pinctrl_priv_data *priv)
949 struct device *dev = &pdev->dev;
950 struct exynos5440_gpio_intr_data *intd;
953 intd = devm_kzalloc(dev, sizeof(*intd) * EXYNOS5440_MAX_GPIO_INT,
956 dev_err(dev, "failed to allocate memory for gpio intr data\n");
960 for (i = 0; i < EXYNOS5440_MAX_GPIO_INT; i++) {
961 irq = irq_of_parse_and_map(dev->of_node, i);
963 dev_err(dev, "irq parsing failed\n");
969 ret = devm_request_irq(dev, irq, exynos5440_gpio_irq,
970 0, dev_name(dev), intd++);
972 dev_err(dev, "irq request failed\n");
977 priv->irq_domain = irq_domain_add_linear(dev->of_node,
978 EXYNOS5440_MAX_GPIO_INT,
979 &exynos5440_gpio_irqd_ops, priv);
980 if (!priv->irq_domain) {
981 dev_err(dev, "failed to create irq domain\n");
988 static int exynos5440_pinctrl_probe(struct platform_device *pdev)
990 struct device *dev = &pdev->dev;
991 struct exynos5440_pinctrl_priv_data *priv;
992 struct resource *res;
996 dev_err(dev, "device tree node not found\n");
1000 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
1002 dev_err(dev, "could not allocate memory for private data\n");
1006 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1007 priv->reg_base = devm_ioremap_resource(&pdev->dev, res);
1008 if (IS_ERR(priv->reg_base))
1009 return PTR_ERR(priv->reg_base);
1011 ret = exynos5440_gpiolib_register(pdev, priv);
1015 ret = exynos5440_pinctrl_register(pdev, priv);
1017 exynos5440_gpiolib_unregister(pdev, priv);
1021 ret = exynos5440_gpio_irq_init(pdev, priv);
1023 dev_err(dev, "failed to setup gpio interrupts\n");
1027 platform_set_drvdata(pdev, priv);
1028 dev_info(dev, "EXYNOS5440 pinctrl driver registered\n");
1032 static const struct of_device_id exynos5440_pinctrl_dt_match[] = {
1033 { .compatible = "samsung,exynos5440-pinctrl" },
1036 MODULE_DEVICE_TABLE(of, exynos5440_pinctrl_dt_match);
1038 static struct platform_driver exynos5440_pinctrl_driver = {
1039 .probe = exynos5440_pinctrl_probe,
1041 .name = "exynos5440-pinctrl",
1042 .owner = THIS_MODULE,
1043 .of_match_table = exynos5440_pinctrl_dt_match,
1047 static int __init exynos5440_pinctrl_drv_register(void)
1049 return platform_driver_register(&exynos5440_pinctrl_driver);
1051 postcore_initcall(exynos5440_pinctrl_drv_register);
1053 static void __exit exynos5440_pinctrl_drv_unregister(void)
1055 platform_driver_unregister(&exynos5440_pinctrl_driver);
1057 module_exit(exynos5440_pinctrl_drv_unregister);
1059 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
1060 MODULE_DESCRIPTION("Samsung EXYNOS5440 SoC pinctrl driver");
1061 MODULE_LICENSE("GPL v2");