diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-samsung.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-samsung.c | 888 |
1 files changed, 888 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c new file mode 100644 index 00000000000..dd108a94acf --- /dev/null +++ b/drivers/pinctrl/pinctrl-samsung.c @@ -0,0 +1,888 @@ +/* + * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's. + * + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * Copyright (c) 2012 Linaro Ltd + * http://www.linaro.org + * + * Author: Thomas Abraham <thomas.ab@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This driver implements the Samsung pinctrl driver. It supports setting up of + * pinmux and pinconf configurations. The gpiolib interface is also included. + * External interrupt (gpio and wakeup) support are not included in this driver + * but provides extensions to which platform specific implementation of the gpio + * and wakeup interrupts can be hooked to. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/gpio.h> + +#include "core.h" +#include "pinctrl-samsung.h" + +#define GROUP_SUFFIX "-grp" +#define GSUFFIX_LEN sizeof(GROUP_SUFFIX) +#define FUNCTION_SUFFIX "-mux" +#define FSUFFIX_LEN sizeof(FUNCTION_SUFFIX) + +/* list of all possible config options supported */ +struct pin_config { + char *prop_cfg; + unsigned int cfg_type; +} pcfgs[] = { + { "samsung,pin-pud", PINCFG_TYPE_PUD }, + { "samsung,pin-drv", PINCFG_TYPE_DRV }, + { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN }, + { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN }, +}; + +/* check if the selector is a valid pin group selector */ +static int samsung_get_group_count(struct pinctrl_dev *pctldev) +{ + struct samsung_pinctrl_drv_data *drvdata; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + return drvdata->nr_groups; +} + +/* return the name of the group selected by the group selector */ +static const char *samsung_get_group_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + struct samsung_pinctrl_drv_data *drvdata; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + return drvdata->pin_groups[selector].name; +} + +/* return the pin numbers associated with the specified group */ +static int samsung_get_group_pins(struct pinctrl_dev *pctldev, + unsigned selector, const unsigned **pins, unsigned *num_pins) +{ + struct samsung_pinctrl_drv_data *drvdata; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + *pins = drvdata->pin_groups[selector].pins; + *num_pins = drvdata->pin_groups[selector].num_pins; + return 0; +} + +/* create pinctrl_map entries by parsing device tree nodes */ +static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, struct pinctrl_map **maps, + unsigned *nmaps) +{ + struct device *dev = pctldev->dev; + struct pinctrl_map *map; + unsigned long *cfg = NULL; + char *gname, *fname; + int cfg_cnt = 0, map_cnt = 0, idx = 0; + + /* count the number of config options specfied in the node */ + for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) { + if (of_find_property(np, pcfgs[idx].prop_cfg, NULL)) + cfg_cnt++; + } + + /* + * Find out the number of map entries to create. All the config options + * can be accomadated into a single config map entry. + */ + if (cfg_cnt) + map_cnt = 1; + if (of_find_property(np, "samsung,pin-function", NULL)) + map_cnt++; + if (!map_cnt) { + dev_err(dev, "node %s does not have either config or function " + "configurations\n", np->name); + return -EINVAL; + } + + /* Allocate memory for pin-map entries */ + map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL); + if (!map) { + dev_err(dev, "could not alloc memory for pin-maps\n"); + return -ENOMEM; + } + *nmaps = 0; + + /* + * Allocate memory for pin group name. The pin group name is derived + * from the node name from which these map entries are be created. + */ + gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL); + if (!gname) { + dev_err(dev, "failed to alloc memory for group name\n"); + goto free_map; + } + sprintf(gname, "%s%s", np->name, GROUP_SUFFIX); + + /* + * don't have config options? then skip over to creating function + * map entries. + */ + if (!cfg_cnt) + goto skip_cfgs; + + /* Allocate memory for config entries */ + cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL); + if (!cfg) { + dev_err(dev, "failed to alloc memory for configs\n"); + goto free_gname; + } + + /* Prepare a list of config settings */ + for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) { + u32 value; + if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value)) + cfg[cfg_cnt++] = + PINCFG_PACK(pcfgs[idx].cfg_type, value); + } + + /* create the config map entry */ + map[*nmaps].data.configs.group_or_pin = gname; + map[*nmaps].data.configs.configs = cfg; + map[*nmaps].data.configs.num_configs = cfg_cnt; + map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP; + *nmaps += 1; + +skip_cfgs: + /* create the function map entry */ + if (of_find_property(np, "samsung,pin-function", NULL)) { + fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL); + if (!fname) { + dev_err(dev, "failed to alloc memory for func name\n"); + goto free_cfg; + } + sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX); + + map[*nmaps].data.mux.group = gname; + map[*nmaps].data.mux.function = fname; + map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP; + *nmaps += 1; + } + + *maps = map; + return 0; + +free_cfg: + kfree(cfg); +free_gname: + kfree(gname); +free_map: + kfree(map); + return -ENOMEM; +} + +/* free the memory allocated to hold the pin-map table */ +static void samsung_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *map, unsigned num_maps) +{ + int idx; + + for (idx = 0; idx < num_maps; idx++) { + if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) { + kfree(map[idx].data.mux.function); + if (!idx) + kfree(map[idx].data.mux.group); + } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) { + kfree(map[idx].data.configs.configs); + if (!idx) + kfree(map[idx].data.configs.group_or_pin); + } + }; + + kfree(map); +} + +/* list of pinctrl callbacks for the pinctrl core */ +static struct pinctrl_ops samsung_pctrl_ops = { + .get_groups_count = samsung_get_group_count, + .get_group_name = samsung_get_group_name, + .get_group_pins = samsung_get_group_pins, + .dt_node_to_map = samsung_dt_node_to_map, + .dt_free_map = samsung_dt_free_map, +}; + +/* check if the selector is a valid pin function selector */ +static int samsung_get_functions_count(struct pinctrl_dev *pctldev) +{ + struct samsung_pinctrl_drv_data *drvdata; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + return drvdata->nr_functions; +} + +/* return the name of the pin function specified */ +static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev, + unsigned selector) +{ + struct samsung_pinctrl_drv_data *drvdata; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + return drvdata->pmx_functions[selector].name; +} + +/* return the groups associated for the specified function selector */ +static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev, + unsigned selector, const char * const **groups, + unsigned * const num_groups) +{ + struct samsung_pinctrl_drv_data *drvdata; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + *groups = drvdata->pmx_functions[selector].groups; + *num_groups = drvdata->pmx_functions[selector].num_groups; + return 0; +} + +/* + * given a pin number that is local to a pin controller, find out the pin bank + * and the register base of the pin bank. + */ +static void pin_to_reg_bank(struct gpio_chip *gc, unsigned pin, + void __iomem **reg, u32 *offset, + struct samsung_pin_bank **bank) +{ + struct samsung_pinctrl_drv_data *drvdata; + struct samsung_pin_bank *b; + + drvdata = dev_get_drvdata(gc->dev); + b = drvdata->ctrl->pin_banks; + + while ((pin >= b->pin_base) && + ((b->pin_base + b->nr_pins - 1) < pin)) + b++; + + *reg = drvdata->virt_base + b->pctl_offset; + *offset = pin - b->pin_base; + if (bank) + *bank = b; + + /* some banks have two config registers in a single bank */ + if (*offset * b->func_width > BITS_PER_LONG) + *reg += 4; +} + +/* enable or disable a pinmux function */ +static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector, + unsigned group, bool enable) +{ + struct samsung_pinctrl_drv_data *drvdata; + const unsigned int *pins; + struct samsung_pin_bank *bank; + void __iomem *reg; + u32 mask, shift, data, pin_offset, cnt; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + pins = drvdata->pin_groups[group].pins; + + /* + * for each pin in the pin group selected, program the correspoding pin + * pin function number in the config register. + */ + for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) { + pin_to_reg_bank(drvdata->gc, pins[cnt] - drvdata->ctrl->base, + ®, &pin_offset, &bank); + mask = (1 << bank->func_width) - 1; + shift = pin_offset * bank->func_width; + + data = readl(reg); + data &= ~(mask << shift); + if (enable) + data |= drvdata->pin_groups[group].func << shift; + writel(data, reg); + } +} + +/* enable a specified pinmux by writing to registers */ +static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector, + unsigned group) +{ + samsung_pinmux_setup(pctldev, selector, group, true); + return 0; +} + +/* disable a specified pinmux by writing to registers */ +static void samsung_pinmux_disable(struct pinctrl_dev *pctldev, + unsigned selector, unsigned group) +{ + samsung_pinmux_setup(pctldev, selector, group, false); +} + +/* + * The calls to gpio_direction_output() and gpio_direction_input() + * leads to this function call (via the pinctrl_gpio_direction_{input|output}() + * function called from the gpiolib interface). + */ +static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned offset, bool input) +{ + struct samsung_pin_bank *bank; + void __iomem *reg; + u32 data, pin_offset, mask, shift; + + pin_to_reg_bank(range->gc, offset, ®, &pin_offset, &bank); + mask = (1 << bank->func_width) - 1; + shift = pin_offset * bank->func_width; + + data = readl(reg); + data &= ~(mask << shift); + if (!input) + data |= FUNC_OUTPUT << shift; + writel(data, reg); + return 0; +} + +/* list of pinmux callbacks for the pinmux vertical in pinctrl core */ +static struct pinmux_ops samsung_pinmux_ops = { + .get_functions_count = samsung_get_functions_count, + .get_function_name = samsung_pinmux_get_fname, + .get_function_groups = samsung_pinmux_get_groups, + .enable = samsung_pinmux_enable, + .disable = samsung_pinmux_disable, + .gpio_set_direction = samsung_pinmux_gpio_set_direction, +}; + +/* set or get the pin config settings for a specified pin */ +static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *config, bool set) +{ + struct samsung_pinctrl_drv_data *drvdata; + struct samsung_pin_bank *bank; + void __iomem *reg_base; + enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config); + u32 data, width, pin_offset, mask, shift; + u32 cfg_value, cfg_reg; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + pin_to_reg_bank(drvdata->gc, pin - drvdata->ctrl->base, ®_base, + &pin_offset, &bank); + + switch (cfg_type) { + case PINCFG_TYPE_PUD: + width = bank->pud_width; + cfg_reg = PUD_REG; + break; + case PINCFG_TYPE_DRV: + width = bank->drv_width; + cfg_reg = DRV_REG; + break; + case PINCFG_TYPE_CON_PDN: + width = bank->conpdn_width; + cfg_reg = CONPDN_REG; + break; + case PINCFG_TYPE_PUD_PDN: + width = bank->pudpdn_width; + cfg_reg = PUDPDN_REG; + break; + default: + WARN_ON(1); + return -EINVAL; + } + + mask = (1 << width) - 1; + shift = pin_offset * width; + data = readl(reg_base + cfg_reg); + + if (set) { + cfg_value = PINCFG_UNPACK_VALUE(*config); + data &= ~(mask << shift); + data |= (cfg_value << shift); + writel(data, reg_base + cfg_reg); + } else { + data >>= shift; + data &= mask; + *config = PINCFG_PACK(cfg_type, data); + } + return 0; +} + +/* set the pin config settings for a specified pin */ +static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long config) +{ + return samsung_pinconf_rw(pctldev, pin, &config, true); +} + +/* get the pin config settings for a specified pin */ +static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *config) +{ + return samsung_pinconf_rw(pctldev, pin, config, false); +} + +/* set the pin config settings for a specified pin group */ +static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev, + unsigned group, unsigned long config) +{ + struct samsung_pinctrl_drv_data *drvdata; + const unsigned int *pins; + unsigned int cnt; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + pins = drvdata->pin_groups[group].pins; + + for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) + samsung_pinconf_set(pctldev, pins[cnt], config); + + return 0; +} + +/* get the pin config settings for a specified pin group */ +static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev, + unsigned int group, unsigned long *config) +{ + struct samsung_pinctrl_drv_data *drvdata; + const unsigned int *pins; + + drvdata = pinctrl_dev_get_drvdata(pctldev); + pins = drvdata->pin_groups[group].pins; + samsung_pinconf_get(pctldev, pins[0], config); + return 0; +} + +/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */ +static struct pinconf_ops samsung_pinconf_ops = { + .pin_config_get = samsung_pinconf_get, + .pin_config_set = samsung_pinconf_set, + .pin_config_group_get = samsung_pinconf_group_get, + .pin_config_group_set = samsung_pinconf_group_set, +}; + +/* gpiolib gpio_set callback function */ +static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value) +{ + void __iomem *reg; + u32 pin_offset, data; + + pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL); + data = readl(reg + DAT_REG); + data &= ~(1 << pin_offset); + if (value) + data |= 1 << pin_offset; + writel(data, reg + DAT_REG); +} + +/* gpiolib gpio_get callback function */ +static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + void __iomem *reg; + u32 pin_offset, data; + + pin_to_reg_bank(gc, offset, ®, &pin_offset, NULL); + data = readl(reg + DAT_REG); + data >>= pin_offset; + data &= 1; + return data; +} + +/* + * gpiolib gpio_direction_input callback function. The setting of the pin + * mux function as 'gpio input' will be handled by the pinctrl susbsystem + * interface. + */ +static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset) +{ + return pinctrl_gpio_direction_input(gc->base + offset); +} + +/* + * gpiolib gpio_direction_output callback function. The setting of the pin + * mux function as 'gpio output' will be handled by the pinctrl susbsystem + * interface. + */ +static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset, + int value) +{ + samsung_gpio_set(gc, offset, value); + return pinctrl_gpio_direction_output(gc->base + offset); +} + +/* + * Parse the pin names listed in the 'samsung,pins' property and convert it + * into a list of gpio numbers are create a pin group from it. + */ +static int __init samsung_pinctrl_parse_dt_pins(struct platform_device *pdev, + struct device_node *cfg_np, struct pinctrl_desc *pctl, + unsigned int **pin_list, unsigned int *npins) +{ + struct device *dev = &pdev->dev; + struct property *prop; + struct pinctrl_pin_desc const *pdesc = pctl->pins; + unsigned int idx = 0, cnt; + const char *pin_name; + + *npins = of_property_count_strings(cfg_np, "samsung,pins"); + if (*npins < 0) { + dev_err(dev, "invalid pin list in %s node", cfg_np->name); + return -EINVAL; + } + + *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL); + if (!*pin_list) { + dev_err(dev, "failed to allocate memory for pin list\n"); + return -ENOMEM; + } + + of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) { + for (cnt = 0; cnt < pctl->npins; cnt++) { + if (pdesc[cnt].name) { + if (!strcmp(pin_name, pdesc[cnt].name)) { + (*pin_list)[idx++] = pdesc[cnt].number; + break; + } + } + } + if (cnt == pctl->npins) { + dev_err(dev, "pin %s not valid in %s node\n", + pin_name, cfg_np->name); + devm_kfree(dev, *pin_list); + return -EINVAL; + } + } + + return 0; +} + +/* + * Parse the information about all the available pin groups and pin functions + * from device node of the pin-controller. A pin group is formed with all + * the pins listed in the "samsung,pins" property. + */ +static int __init samsung_pinctrl_parse_dt(struct platform_device *pdev, + struct samsung_pinctrl_drv_data *drvdata) +{ + struct device *dev = &pdev->dev; + struct device_node *dev_np = dev->of_node; + struct device_node *cfg_np; + struct samsung_pin_group *groups, *grp; + struct samsung_pmx_func *functions, *func; + unsigned *pin_list; + unsigned int npins, grp_cnt, func_idx = 0; + char *gname, *fname; + int ret; + + grp_cnt = of_get_child_count(dev_np); + if (!grp_cnt) + return -EINVAL; + + groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL); + if (!groups) { + dev_err(dev, "failed allocate memory for ping group list\n"); + return -EINVAL; + } + grp = groups; + + functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL); + if (!functions) { + dev_err(dev, "failed to allocate memory for function list\n"); + return -EINVAL; + } + func = functions; + + /* + * Iterate over all the child nodes of the pin controller node + * and create pin groups and pin function lists. + */ + for_each_child_of_node(dev_np, cfg_np) { + u32 function; + if (of_find_property(cfg_np, "interrupt-controller", NULL)) + continue; + + ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np, + &drvdata->pctl, &pin_list, &npins); + if (ret) + return ret; + + /* derive pin group name from the node name */ + gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN, + GFP_KERNEL); + if (!gname) { + dev_err(dev, "failed to alloc memory for group name\n"); + return -ENOMEM; + } + sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX); + + grp->name = gname; + grp->pins = pin_list; + grp->num_pins = npins; + of_property_read_u32(cfg_np, "samsung,pin-function", &function); + grp->func = function; + grp++; + + if (!of_find_property(cfg_np, "samsung,pin-function", NULL)) + continue; + + /* derive function name from the node name */ + fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN, + GFP_KERNEL); + if (!fname) { + dev_err(dev, "failed to alloc memory for func name\n"); + return -ENOMEM; + } + sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX); + + func->name = fname; + func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL); + if (!func->groups) { + dev_err(dev, "failed to alloc memory for group list " + "in pin function"); + return -ENOMEM; + } + func->groups[0] = gname; + func->num_groups = 1; + func++; + func_idx++; + } + + drvdata->pin_groups = groups; + drvdata->nr_groups = grp_cnt; + drvdata->pmx_functions = functions; + drvdata->nr_functions = func_idx; + + return 0; +} + +/* register the pinctrl interface with the pinctrl subsystem */ +static int __init samsung_pinctrl_register(struct platform_device *pdev, + struct samsung_pinctrl_drv_data *drvdata) +{ + struct pinctrl_desc *ctrldesc = &drvdata->pctl; + struct pinctrl_pin_desc *pindesc, *pdesc; + struct samsung_pin_bank *pin_bank; + char *pin_names; + int pin, bank, ret; + + ctrldesc->name = "samsung-pinctrl"; + ctrldesc->owner = THIS_MODULE; + ctrldesc->pctlops = &samsung_pctrl_ops; + ctrldesc->pmxops = &samsung_pinmux_ops; + ctrldesc->confops = &samsung_pinconf_ops; + + pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) * + drvdata->ctrl->nr_pins, GFP_KERNEL); + if (!pindesc) { + dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n"); + return -ENOMEM; + } + ctrldesc->pins = pindesc; + ctrldesc->npins = drvdata->ctrl->nr_pins; + ctrldesc->npins = drvdata->ctrl->nr_pins; + + /* dynamically populate the pin number and pin name for pindesc */ + for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++) + pdesc->number = pin + drvdata->ctrl->base; + + /* + * allocate space for storing the dynamically generated names for all + * the pins which belong to this pin-controller. + */ + pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH * + drvdata->ctrl->nr_pins, GFP_KERNEL); + if (!pin_names) { + dev_err(&pdev->dev, "mem alloc for pin names failed\n"); + return -ENOMEM; + } + + /* for each pin, the name of the pin is pin-bank name + pin number */ + for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) { + pin_bank = &drvdata->ctrl->pin_banks[bank]; + for (pin = 0; pin < pin_bank->nr_pins; pin++) { + sprintf(pin_names, "%s-%d", pin_bank->name, pin); + pdesc = pindesc + pin_bank->pin_base + pin; + pdesc->name = pin_names; + pin_names += PIN_NAME_LENGTH; + } + } + + drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata); + if (!drvdata->pctl_dev) { + dev_err(&pdev->dev, "could not register pinctrl driver\n"); + return -EINVAL; + } + + drvdata->grange.name = "samsung-pctrl-gpio-range"; + drvdata->grange.id = 0; + drvdata->grange.base = drvdata->ctrl->base; + drvdata->grange.npins = drvdata->ctrl->nr_pins; + drvdata->grange.gc = drvdata->gc; + pinctrl_add_gpio_range(drvdata->pctl_dev, &drvdata->grange); + + ret = samsung_pinctrl_parse_dt(pdev, drvdata); + if (ret) { + pinctrl_unregister(drvdata->pctl_dev); + return ret; + } + + return 0; +} + +/* register the gpiolib interface with the gpiolib subsystem */ +static int __init samsung_gpiolib_register(struct platform_device *pdev, + struct samsung_pinctrl_drv_data *drvdata) +{ + struct gpio_chip *gc; + int ret; + + gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); + if (!gc) { + dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n"); + return -ENOMEM; + } + + drvdata->gc = gc; + gc->base = drvdata->ctrl->base; + gc->ngpio = drvdata->ctrl->nr_pins; + gc->dev = &pdev->dev; + gc->set = samsung_gpio_set; + gc->get = samsung_gpio_get; + gc->direction_input = samsung_gpio_direction_input; + gc->direction_output = samsung_gpio_direction_output; + gc->label = drvdata->ctrl->label; + gc->owner = THIS_MODULE; + ret = gpiochip_add(gc); + if (ret) { + dev_err(&pdev->dev, "failed to register gpio_chip %s, error " + "code: %d\n", gc->label, ret); + return ret; + } + + return 0; +} + +/* unregister the gpiolib interface with the gpiolib subsystem */ +static int __init samsung_gpiolib_unregister(struct platform_device *pdev, + struct samsung_pinctrl_drv_data *drvdata) +{ + int ret = gpiochip_remove(drvdata->gc); + if (ret) { + dev_err(&pdev->dev, "gpio chip remove failed\n"); + return ret; + } + return 0; +} + +static const struct of_device_id samsung_pinctrl_dt_match[]; + +/* retrieve the soc specific data */ +static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data( + struct platform_device *pdev) +{ + int id; + const struct of_device_id *match; + const struct device_node *node = pdev->dev.of_node; + + id = of_alias_get_id(pdev->dev.of_node, "pinctrl"); + if (id < 0) { + dev_err(&pdev->dev, "failed to get alias id\n"); + return NULL; + } + match = of_match_node(samsung_pinctrl_dt_match, node); + return (struct samsung_pin_ctrl *)match->data + id; +} + +static int __devinit samsung_pinctrl_probe(struct platform_device *pdev) +{ + struct samsung_pinctrl_drv_data *drvdata; + struct device *dev = &pdev->dev; + struct samsung_pin_ctrl *ctrl; + struct resource *res; + int ret; + + if (!dev->of_node) { + dev_err(dev, "device tree node not found\n"); + return -ENODEV; + } + + ctrl = samsung_pinctrl_get_soc_data(pdev); + if (!ctrl) { + dev_err(&pdev->dev, "driver data not available\n"); + return -EINVAL; + } + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) { + dev_err(dev, "failed to allocate memory for driver's " + "private data\n"); + return -ENOMEM; + } + drvdata->ctrl = ctrl; + drvdata->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "cannot find IO resource\n"); + return -ENOENT; + } + + drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res); + if (!drvdata->virt_base) { + dev_err(dev, "ioremap failed\n"); + return -ENODEV; + } + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (res) + drvdata->irq = res->start; + + ret = samsung_gpiolib_register(pdev, drvdata); + if (ret) + return ret; + + ret = samsung_pinctrl_register(pdev, drvdata); + if (ret) { + samsung_gpiolib_unregister(pdev, drvdata); + return ret; + } + + if (ctrl->eint_gpio_init) + ctrl->eint_gpio_init(drvdata); + if (ctrl->eint_wkup_init) + ctrl->eint_wkup_init(drvdata); + + platform_set_drvdata(pdev, drvdata); + return 0; +} + +static const struct of_device_id samsung_pinctrl_dt_match[] = { + { .compatible = "samsung,pinctrl-exynos4210", + .data = (void *)exynos4210_pin_ctrl }, + {}, +}; +MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match); + +static struct platform_driver samsung_pinctrl_driver = { + .probe = samsung_pinctrl_probe, + .driver = { + .name = "samsung-pinctrl", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(samsung_pinctrl_dt_match), + }, +}; + +static int __init samsung_pinctrl_drv_register(void) +{ + return platform_driver_register(&samsung_pinctrl_driver); +} +postcore_initcall(samsung_pinctrl_drv_register); + +static void __exit samsung_pinctrl_drv_unregister(void) +{ + platform_driver_unregister(&samsung_pinctrl_driver); +} +module_exit(samsung_pinctrl_drv_unregister); + +MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>"); +MODULE_DESCRIPTION("Samsung pinctrl driver"); +MODULE_LICENSE("GPL v2"); |