| // SPDX-License-Identifier: GPL-2.0+ |
| // |
| // 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 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/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/gpio/driver.h> |
| #include <linux/irqdomain.h> |
| #include <linux/of_device.h> |
| #include <linux/spinlock.h> |
| |
| #include <dt-bindings/pinctrl/samsung.h> |
| |
| #include "../core.h" |
| #include "pinctrl-samsung.h" |
| |
| /* maximum number of the memory resources */ |
| #define SAMSUNG_PINCTRL_NUM_RESOURCES 2 |
| |
| /* list of all possible config options supported */ |
| static struct pin_config { |
| const char *property; |
| enum pincfg_type param; |
| } cfg_params[] = { |
| { "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 }, |
| { "samsung,pin-val", PINCFG_TYPE_DAT }, |
| }; |
| |
| static unsigned int pin_base; |
| |
| static int samsung_get_group_count(struct pinctrl_dev *pctldev) |
| { |
| struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev); |
| |
| return pmx->nr_groups; |
| } |
| |
| static const char *samsung_get_group_name(struct pinctrl_dev *pctldev, |
| unsigned group) |
| { |
| struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev); |
| |
| return pmx->pin_groups[group].name; |
| } |
| |
| static int samsung_get_group_pins(struct pinctrl_dev *pctldev, |
| unsigned group, |
| const unsigned **pins, |
| unsigned *num_pins) |
| { |
| struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev); |
| |
| *pins = pmx->pin_groups[group].pins; |
| *num_pins = pmx->pin_groups[group].num_pins; |
| |
| return 0; |
| } |
| |
| static int reserve_map(struct device *dev, struct pinctrl_map **map, |
| unsigned *reserved_maps, unsigned *num_maps, |
| unsigned reserve) |
| { |
| unsigned old_num = *reserved_maps; |
| unsigned new_num = *num_maps + reserve; |
| struct pinctrl_map *new_map; |
| |
| if (old_num >= new_num) |
| return 0; |
| |
| new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL); |
| if (!new_map) |
| return -ENOMEM; |
| |
| memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map)); |
| |
| *map = new_map; |
| *reserved_maps = new_num; |
| |
| return 0; |
| } |
| |
| static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps, |
| unsigned *num_maps, const char *group, |
| const char *function) |
| { |
| if (WARN_ON(*num_maps == *reserved_maps)) |
| return -ENOSPC; |
| |
| (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP; |
| (*map)[*num_maps].data.mux.group = group; |
| (*map)[*num_maps].data.mux.function = function; |
| (*num_maps)++; |
| |
| return 0; |
| } |
| |
| static int add_map_configs(struct device *dev, struct pinctrl_map **map, |
| unsigned *reserved_maps, unsigned *num_maps, |
| const char *group, unsigned long *configs, |
| unsigned num_configs) |
| { |
| unsigned long *dup_configs; |
| |
| if (WARN_ON(*num_maps == *reserved_maps)) |
| return -ENOSPC; |
| |
| dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs), |
| GFP_KERNEL); |
| if (!dup_configs) |
| return -ENOMEM; |
| |
| (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP; |
| (*map)[*num_maps].data.configs.group_or_pin = group; |
| (*map)[*num_maps].data.configs.configs = dup_configs; |
| (*map)[*num_maps].data.configs.num_configs = num_configs; |
| (*num_maps)++; |
| |
| return 0; |
| } |
| |
| static int add_config(struct device *dev, unsigned long **configs, |
| unsigned *num_configs, unsigned long config) |
| { |
| unsigned old_num = *num_configs; |
| unsigned new_num = old_num + 1; |
| unsigned long *new_configs; |
| |
| new_configs = krealloc(*configs, sizeof(*new_configs) * new_num, |
| GFP_KERNEL); |
| if (!new_configs) |
| return -ENOMEM; |
| |
| new_configs[old_num] = config; |
| |
| *configs = new_configs; |
| *num_configs = new_num; |
| |
| return 0; |
| } |
| |
| static void samsung_dt_free_map(struct pinctrl_dev *pctldev, |
| struct pinctrl_map *map, |
| unsigned num_maps) |
| { |
| int i; |
| |
| for (i = 0; i < num_maps; i++) |
| if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP) |
| kfree(map[i].data.configs.configs); |
| |
| kfree(map); |
| } |
| |
| static int samsung_dt_subnode_to_map(struct samsung_pinctrl_drv_data *drvdata, |
| struct device *dev, |
| struct device_node *np, |
| struct pinctrl_map **map, |
| unsigned *reserved_maps, |
| unsigned *num_maps) |
| { |
| int ret, i; |
| u32 val; |
| unsigned long config; |
| unsigned long *configs = NULL; |
| unsigned num_configs = 0; |
| unsigned reserve; |
| struct property *prop; |
| const char *group; |
| bool has_func = false; |
| |
| ret = of_property_read_u32(np, "samsung,pin-function", &val); |
| if (!ret) |
| has_func = true; |
| |
| for (i = 0; i < ARRAY_SIZE(cfg_params); i++) { |
| ret = of_property_read_u32(np, cfg_params[i].property, &val); |
| if (!ret) { |
| config = PINCFG_PACK(cfg_params[i].param, val); |
| ret = add_config(dev, &configs, &num_configs, config); |
| if (ret < 0) |
| goto exit; |
| /* EINVAL=missing, which is fine since it's optional */ |
| } else if (ret != -EINVAL) { |
| dev_err(dev, "could not parse property %s\n", |
| cfg_params[i].property); |
| } |
| } |
| |
| reserve = 0; |
| if (has_func) |
| reserve++; |
| if (num_configs) |
| reserve++; |
| ret = of_property_count_strings(np, "samsung,pins"); |
| if (ret < 0) { |
| dev_err(dev, "could not parse property samsung,pins\n"); |
| goto exit; |
| } |
| reserve *= ret; |
| |
| ret = reserve_map(dev, map, reserved_maps, num_maps, reserve); |
| if (ret < 0) |
| goto exit; |
| |
| of_property_for_each_string(np, "samsung,pins", prop, group) { |
| if (has_func) { |
| ret = add_map_mux(map, reserved_maps, |
| num_maps, group, np->full_name); |
| if (ret < 0) |
| goto exit; |
| } |
| |
| if (num_configs) { |
| ret = add_map_configs(dev, map, reserved_maps, |
| num_maps, group, configs, |
| num_configs); |
| if (ret < 0) |
| goto exit; |
| } |
| } |
| |
| ret = 0; |
| |
| exit: |
| kfree(configs); |
| return ret; |
| } |
| |
| static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev, |
| struct device_node *np_config, |
| struct pinctrl_map **map, |
| unsigned *num_maps) |
| { |
| struct samsung_pinctrl_drv_data *drvdata; |
| unsigned reserved_maps; |
| struct device_node *np; |
| int ret; |
| |
| drvdata = pinctrl_dev_get_drvdata(pctldev); |
| |
| reserved_maps = 0; |
| *map = NULL; |
| *num_maps = 0; |
| |
| if (!of_get_child_count(np_config)) |
| return samsung_dt_subnode_to_map(drvdata, pctldev->dev, |
| np_config, map, |
| &reserved_maps, |
| num_maps); |
| |
| for_each_child_of_node(np_config, np) { |
| ret = samsung_dt_subnode_to_map(drvdata, pctldev->dev, np, map, |
| &reserved_maps, num_maps); |
| if (ret < 0) { |
| samsung_dt_free_map(pctldev, *map, *num_maps); |
| of_node_put(np); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| /* Forward declaration which can be used by samsung_pin_dbg_show */ |
| static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin, |
| unsigned long *config); |
| static const char * const reg_names[] = {"CON", "DAT", "PUD", "DRV", "CON_PDN", |
| "PUD_PDN"}; |
| |
| static void samsung_pin_dbg_show(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned int pin) |
| { |
| enum pincfg_type cfg_type; |
| unsigned long config; |
| int ret; |
| |
| for (cfg_type = 0; cfg_type < PINCFG_TYPE_NUM; cfg_type++) { |
| config = PINCFG_PACK(cfg_type, 0); |
| ret = samsung_pinconf_get(pctldev, pin, &config); |
| if (ret < 0) |
| continue; |
| |
| seq_printf(s, " %s(0x%lx)", reg_names[cfg_type], |
| PINCFG_UNPACK_VALUE(config)); |
| } |
| } |
| #endif |
| |
| /* list of pinctrl callbacks for the pinctrl core */ |
| static const 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, |
| #ifdef CONFIG_DEBUG_FS |
| .pin_dbg_show = samsung_pin_dbg_show, |
| #endif |
| }; |
| |
| /* 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 samsung_pinctrl_drv_data *drvdata, |
| unsigned pin, void __iomem **reg, u32 *offset, |
| struct samsung_pin_bank **bank) |
| { |
| struct samsung_pin_bank *b; |
| |
| b = drvdata->pin_banks; |
| |
| while ((pin >= b->pin_base) && |
| ((b->pin_base + b->nr_pins - 1) < pin)) |
| b++; |
| |
| *reg = b->pctl_base + b->pctl_offset; |
| *offset = pin - b->pin_base; |
| if (bank) |
| *bank = b; |
| } |
| |
| /* enable or disable a pinmux function */ |
| static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector, |
| unsigned group) |
| { |
| struct samsung_pinctrl_drv_data *drvdata; |
| const struct samsung_pin_bank_type *type; |
| struct samsung_pin_bank *bank; |
| void __iomem *reg; |
| u32 mask, shift, data, pin_offset; |
| unsigned long flags; |
| const struct samsung_pmx_func *func; |
| const struct samsung_pin_group *grp; |
| |
| drvdata = pinctrl_dev_get_drvdata(pctldev); |
| func = &drvdata->pmx_functions[selector]; |
| grp = &drvdata->pin_groups[group]; |
| |
| pin_to_reg_bank(drvdata, grp->pins[0] - drvdata->pin_base, |
| ®, &pin_offset, &bank); |
| type = bank->type; |
| mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1; |
| shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC]; |
| if (shift >= 32) { |
| /* Some banks have two config registers */ |
| shift -= 32; |
| reg += 4; |
| } |
| |
| raw_spin_lock_irqsave(&bank->slock, flags); |
| |
| data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]); |
| data &= ~(mask << shift); |
| data |= func->val << shift; |
| writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]); |
| |
| raw_spin_unlock_irqrestore(&bank->slock, flags); |
| } |
| |
| /* enable a specified pinmux by writing to registers */ |
| static int samsung_pinmux_set_mux(struct pinctrl_dev *pctldev, |
| unsigned selector, |
| unsigned group) |
| { |
| samsung_pinmux_setup(pctldev, selector, group); |
| return 0; |
| } |
| |
| /* list of pinmux callbacks for the pinmux vertical in pinctrl core */ |
| static const 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, |
| .set_mux = samsung_pinmux_set_mux, |
| }; |
| |
| /* 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; |
| const struct samsung_pin_bank_type *type; |
| 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; |
| unsigned long flags; |
| |
| drvdata = pinctrl_dev_get_drvdata(pctldev); |
| pin_to_reg_bank(drvdata, pin - drvdata->pin_base, ®_base, |
| &pin_offset, &bank); |
| type = bank->type; |
| |
| if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type]) |
| return -EINVAL; |
| |
| width = type->fld_width[cfg_type]; |
| cfg_reg = type->reg_offset[cfg_type]; |
| |
| raw_spin_lock_irqsave(&bank->slock, flags); |
| |
| 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); |
| } |
| |
| raw_spin_unlock_irqrestore(&bank->slock, flags); |
| |
| 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 *configs, unsigned num_configs) |
| { |
| int i, ret; |
| |
| for (i = 0; i < num_configs; i++) { |
| ret = samsung_pinconf_rw(pctldev, pin, &configs[i], true); |
| if (ret < 0) |
| return ret; |
| } /* for each config */ |
| |
| return 0; |
| } |
| |
| /* 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 *configs, |
| unsigned num_configs) |
| { |
| 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], configs, num_configs); |
| |
| 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 const 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, |
| }; |
| |
| /* |
| * The samsung_gpio_set_vlaue() should be called with "bank->slock" held |
| * to avoid race condition. |
| */ |
| static void samsung_gpio_set_value(struct gpio_chip *gc, |
| unsigned offset, int value) |
| { |
| struct samsung_pin_bank *bank = gpiochip_get_data(gc); |
| const struct samsung_pin_bank_type *type = bank->type; |
| void __iomem *reg; |
| u32 data; |
| |
| reg = bank->pctl_base + bank->pctl_offset; |
| |
| data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]); |
| data &= ~(1 << offset); |
| if (value) |
| data |= 1 << offset; |
| writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]); |
| } |
| |
| /* gpiolib gpio_set callback function */ |
| static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value) |
| { |
| struct samsung_pin_bank *bank = gpiochip_get_data(gc); |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&bank->slock, flags); |
| samsung_gpio_set_value(gc, offset, value); |
| raw_spin_unlock_irqrestore(&bank->slock, flags); |
| } |
| |
| /* gpiolib gpio_get callback function */ |
| static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset) |
| { |
| void __iomem *reg; |
| u32 data; |
| struct samsung_pin_bank *bank = gpiochip_get_data(gc); |
| const struct samsung_pin_bank_type *type = bank->type; |
| |
| reg = bank->pctl_base + bank->pctl_offset; |
| |
| data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]); |
| data >>= offset; |
| data &= 1; |
| return data; |
| } |
| |
| /* |
| * The samsung_gpio_set_direction() should be called with "bank->slock" held |
| * to avoid race condition. |
| * The calls to gpio_direction_output() and gpio_direction_input() |
| * leads to this function call. |
| */ |
| static int samsung_gpio_set_direction(struct gpio_chip *gc, |
| unsigned offset, bool input) |
| { |
| const struct samsung_pin_bank_type *type; |
| struct samsung_pin_bank *bank; |
| void __iomem *reg; |
| u32 data, mask, shift; |
| |
| bank = gpiochip_get_data(gc); |
| type = bank->type; |
| |
| reg = bank->pctl_base + bank->pctl_offset |
| + type->reg_offset[PINCFG_TYPE_FUNC]; |
| |
| mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1; |
| shift = offset * type->fld_width[PINCFG_TYPE_FUNC]; |
| if (shift >= 32) { |
| /* Some banks have two config registers */ |
| shift -= 32; |
| reg += 4; |
| } |
| |
| data = readl(reg); |
| data &= ~(mask << shift); |
| if (!input) |
| data |= EXYNOS_PIN_FUNC_OUTPUT << shift; |
| writel(data, reg); |
| |
| return 0; |
| } |
| |
| /* gpiolib gpio_direction_input callback function. */ |
| static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset) |
| { |
| struct samsung_pin_bank *bank = gpiochip_get_data(gc); |
| unsigned long flags; |
| int ret; |
| |
| raw_spin_lock_irqsave(&bank->slock, flags); |
| ret = samsung_gpio_set_direction(gc, offset, true); |
| raw_spin_unlock_irqrestore(&bank->slock, flags); |
| return ret; |
| } |
| |
| /* gpiolib gpio_direction_output callback function. */ |
| static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset, |
| int value) |
| { |
| struct samsung_pin_bank *bank = gpiochip_get_data(gc); |
| unsigned long flags; |
| int ret; |
| |
| raw_spin_lock_irqsave(&bank->slock, flags); |
| samsung_gpio_set_value(gc, offset, value); |
| ret = samsung_gpio_set_direction(gc, offset, false); |
| raw_spin_unlock_irqrestore(&bank->slock, flags); |
| |
| return ret; |
| } |
| |
| /* |
| * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin |
| * and a virtual IRQ, if not already present. |
| */ |
| static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset) |
| { |
| struct samsung_pin_bank *bank = gpiochip_get_data(gc); |
| unsigned int virq; |
| |
| if (!bank->irq_domain) |
| return -ENXIO; |
| |
| virq = irq_create_mapping(bank->irq_domain, offset); |
| |
| return (virq) ? : -ENXIO; |
| } |
| |
| static struct samsung_pin_group *samsung_pinctrl_create_groups( |
| struct device *dev, |
| struct samsung_pinctrl_drv_data *drvdata, |
| unsigned int *cnt) |
| { |
| struct pinctrl_desc *ctrldesc = &drvdata->pctl; |
| struct samsung_pin_group *groups, *grp; |
| const struct pinctrl_pin_desc *pdesc; |
| int i; |
| |
| groups = devm_kcalloc(dev, ctrldesc->npins, sizeof(*groups), |
| GFP_KERNEL); |
| if (!groups) |
| return ERR_PTR(-EINVAL); |
| grp = groups; |
| |
| pdesc = ctrldesc->pins; |
| for (i = 0; i < ctrldesc->npins; ++i, ++pdesc, ++grp) { |
| grp->name = pdesc->name; |
| grp->pins = &pdesc->number; |
| grp->num_pins = 1; |
| } |
| |
| *cnt = ctrldesc->npins; |
| return groups; |
| } |
| |
| static int samsung_pinctrl_create_function(struct device *dev, |
| struct samsung_pinctrl_drv_data *drvdata, |
| struct device_node *func_np, |
| struct samsung_pmx_func *func) |
| { |
| int npins; |
| int ret; |
| int i; |
| |
| if (of_property_read_u32(func_np, "samsung,pin-function", &func->val)) |
| return 0; |
| |
| npins = of_property_count_strings(func_np, "samsung,pins"); |
| if (npins < 1) { |
| dev_err(dev, "invalid pin list in %pOFn node", func_np); |
| return -EINVAL; |
| } |
| |
| func->name = func_np->full_name; |
| |
| func->groups = devm_kcalloc(dev, npins, sizeof(char *), GFP_KERNEL); |
| if (!func->groups) |
| return -ENOMEM; |
| |
| for (i = 0; i < npins; ++i) { |
| const char *gname; |
| |
| ret = of_property_read_string_index(func_np, "samsung,pins", |
| i, &gname); |
| if (ret) { |
| dev_err(dev, |
| "failed to read pin name %d from %pOFn node\n", |
| i, func_np); |
| return ret; |
| } |
| |
| func->groups[i] = gname; |
| } |
| |
| func->num_groups = npins; |
| return 1; |
| } |
| |
| static struct samsung_pmx_func *samsung_pinctrl_create_functions( |
| struct device *dev, |
| struct samsung_pinctrl_drv_data *drvdata, |
| unsigned int *cnt) |
| { |
| struct samsung_pmx_func *functions, *func; |
| struct device_node *dev_np = dev->of_node; |
| struct device_node *cfg_np; |
| unsigned int func_cnt = 0; |
| int ret; |
| |
| /* |
| * 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) { |
| struct device_node *func_np; |
| |
| if (!of_get_child_count(cfg_np)) { |
| if (!of_find_property(cfg_np, |
| "samsung,pin-function", NULL)) |
| continue; |
| ++func_cnt; |
| continue; |
| } |
| |
| for_each_child_of_node(cfg_np, func_np) { |
| if (!of_find_property(func_np, |
| "samsung,pin-function", NULL)) |
| continue; |
| ++func_cnt; |
| } |
| } |
| |
| functions = devm_kcalloc(dev, func_cnt, sizeof(*functions), |
| GFP_KERNEL); |
| if (!functions) |
| return ERR_PTR(-ENOMEM); |
| func = functions; |
| |
| /* |
| * Iterate over all the child nodes of the pin controller node |
| * and create pin groups and pin function lists. |
| */ |
| func_cnt = 0; |
| for_each_child_of_node(dev_np, cfg_np) { |
| struct device_node *func_np; |
| |
| if (!of_get_child_count(cfg_np)) { |
| ret = samsung_pinctrl_create_function(dev, drvdata, |
| cfg_np, func); |
| if (ret < 0) { |
| of_node_put(cfg_np); |
| return ERR_PTR(ret); |
| } |
| if (ret > 0) { |
| ++func; |
| ++func_cnt; |
| } |
| continue; |
| } |
| |
| for_each_child_of_node(cfg_np, func_np) { |
| ret = samsung_pinctrl_create_function(dev, drvdata, |
| func_np, func); |
| if (ret < 0) { |
| of_node_put(func_np); |
| of_node_put(cfg_np); |
| return ERR_PTR(ret); |
| } |
| if (ret > 0) { |
| ++func; |
| ++func_cnt; |
| } |
| } |
| } |
| |
| *cnt = func_cnt; |
| return functions; |
| } |
| |
| /* |
| * 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 samsung_pinctrl_parse_dt(struct platform_device *pdev, |
| struct samsung_pinctrl_drv_data *drvdata) |
| { |
| struct device *dev = &pdev->dev; |
| struct samsung_pin_group *groups; |
| struct samsung_pmx_func *functions; |
| unsigned int grp_cnt = 0, func_cnt = 0; |
| |
| groups = samsung_pinctrl_create_groups(dev, drvdata, &grp_cnt); |
| if (IS_ERR(groups)) { |
| dev_err(dev, "failed to parse pin groups\n"); |
| return PTR_ERR(groups); |
| } |
| |
| functions = samsung_pinctrl_create_functions(dev, drvdata, &func_cnt); |
| if (IS_ERR(functions)) { |
| dev_err(dev, "failed to parse pin functions\n"); |
| return PTR_ERR(functions); |
| } |
| |
| drvdata->pin_groups = groups; |
| drvdata->nr_groups = grp_cnt; |
| drvdata->pmx_functions = functions; |
| drvdata->nr_functions = func_cnt; |
| |
| return 0; |
| } |
| |
| /* register the pinctrl interface with the pinctrl subsystem */ |
| static int 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_kcalloc(&pdev->dev, |
| drvdata->nr_pins, sizeof(*pindesc), |
| GFP_KERNEL); |
| if (!pindesc) |
| return -ENOMEM; |
| ctrldesc->pins = pindesc; |
| ctrldesc->npins = drvdata->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->pin_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, |
| array3_size(sizeof(char), PIN_NAME_LENGTH, |
| drvdata->nr_pins), |
| GFP_KERNEL); |
| if (!pin_names) |
| return -ENOMEM; |
| |
| /* for each pin, the name of the pin is pin-bank name + pin number */ |
| for (bank = 0; bank < drvdata->nr_banks; bank++) { |
| pin_bank = &drvdata->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; |
| } |
| } |
| |
| ret = samsung_pinctrl_parse_dt(pdev, drvdata); |
| if (ret) |
| return ret; |
| |
| drvdata->pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc, |
| drvdata); |
| if (IS_ERR(drvdata->pctl_dev)) { |
| dev_err(&pdev->dev, "could not register pinctrl driver\n"); |
| return PTR_ERR(drvdata->pctl_dev); |
| } |
| |
| for (bank = 0; bank < drvdata->nr_banks; ++bank) { |
| pin_bank = &drvdata->pin_banks[bank]; |
| pin_bank->grange.name = pin_bank->name; |
| pin_bank->grange.id = bank; |
| pin_bank->grange.pin_base = drvdata->pin_base |
| + pin_bank->pin_base; |
| pin_bank->grange.base = pin_bank->grange.pin_base; |
| pin_bank->grange.npins = pin_bank->nr_pins; |
| pin_bank->grange.gc = &pin_bank->gpio_chip; |
| pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange); |
| } |
| |
| return 0; |
| } |
| |
| /* unregister the pinctrl interface with the pinctrl subsystem */ |
| static int samsung_pinctrl_unregister(struct platform_device *pdev, |
| struct samsung_pinctrl_drv_data *drvdata) |
| { |
| struct samsung_pin_bank *bank = drvdata->pin_banks; |
| int i; |
| |
| for (i = 0; i < drvdata->nr_banks; ++i, ++bank) |
| pinctrl_remove_gpio_range(drvdata->pctl_dev, &bank->grange); |
| |
| return 0; |
| } |
| |
| static const struct gpio_chip samsung_gpiolib_chip = { |
| .request = gpiochip_generic_request, |
| .free = gpiochip_generic_free, |
| .set = samsung_gpio_set, |
| .get = samsung_gpio_get, |
| .direction_input = samsung_gpio_direction_input, |
| .direction_output = samsung_gpio_direction_output, |
| .to_irq = samsung_gpio_to_irq, |
| .owner = THIS_MODULE, |
| }; |
| |
| /* register the gpiolib interface with the gpiolib subsystem */ |
| static int samsung_gpiolib_register(struct platform_device *pdev, |
| struct samsung_pinctrl_drv_data *drvdata) |
| { |
| struct samsung_pin_bank *bank = drvdata->pin_banks; |
| struct gpio_chip *gc; |
| int ret; |
| int i; |
| |
| for (i = 0; i < drvdata->nr_banks; ++i, ++bank) { |
| bank->gpio_chip = samsung_gpiolib_chip; |
| |
| gc = &bank->gpio_chip; |
| gc->base = bank->grange.base; |
| gc->ngpio = bank->nr_pins; |
| gc->parent = &pdev->dev; |
| gc->of_node = bank->of_node; |
| gc->label = bank->name; |
| |
| ret = devm_gpiochip_add_data(&pdev->dev, gc, bank); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n", |
| gc->label, ret); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static const struct samsung_pin_ctrl * |
| samsung_pinctrl_get_soc_data_for_of_alias(struct platform_device *pdev) |
| { |
| struct device_node *node = pdev->dev.of_node; |
| const struct samsung_pinctrl_of_match_data *of_data; |
| int id; |
| |
| id = of_alias_get_id(node, "pinctrl"); |
| if (id < 0) { |
| dev_err(&pdev->dev, "failed to get alias id\n"); |
| return NULL; |
| } |
| |
| of_data = of_device_get_match_data(&pdev->dev); |
| if (id >= of_data->num_ctrl) { |
| dev_err(&pdev->dev, "invalid alias id %d\n", id); |
| return NULL; |
| } |
| |
| return &(of_data->ctrl[id]); |
| } |
| |
| /* retrieve the soc specific data */ |
| static const struct samsung_pin_ctrl * |
| samsung_pinctrl_get_soc_data(struct samsung_pinctrl_drv_data *d, |
| struct platform_device *pdev) |
| { |
| struct device_node *node = pdev->dev.of_node; |
| struct device_node *np; |
| const struct samsung_pin_bank_data *bdata; |
| const struct samsung_pin_ctrl *ctrl; |
| struct samsung_pin_bank *bank; |
| struct resource *res; |
| void __iomem *virt_base[SAMSUNG_PINCTRL_NUM_RESOURCES]; |
| unsigned int i; |
| |
| ctrl = samsung_pinctrl_get_soc_data_for_of_alias(pdev); |
| if (!ctrl) |
| return ERR_PTR(-ENOENT); |
| |
| d->suspend = ctrl->suspend; |
| d->resume = ctrl->resume; |
| d->nr_banks = ctrl->nr_banks; |
| d->pin_banks = devm_kcalloc(&pdev->dev, d->nr_banks, |
| sizeof(*d->pin_banks), GFP_KERNEL); |
| if (!d->pin_banks) |
| return ERR_PTR(-ENOMEM); |
| |
| if (ctrl->nr_ext_resources + 1 > SAMSUNG_PINCTRL_NUM_RESOURCES) |
| return ERR_PTR(-EINVAL); |
| |
| for (i = 0; i < ctrl->nr_ext_resources + 1; i++) { |
| res = platform_get_resource(pdev, IORESOURCE_MEM, i); |
| if (!res) { |
| dev_err(&pdev->dev, "failed to get mem%d resource\n", i); |
| return ERR_PTR(-EINVAL); |
| } |
| virt_base[i] = devm_ioremap(&pdev->dev, res->start, |
| resource_size(res)); |
| if (!virt_base[i]) { |
| dev_err(&pdev->dev, "failed to ioremap %pR\n", res); |
| return ERR_PTR(-EIO); |
| } |
| } |
| |
| bank = d->pin_banks; |
| bdata = ctrl->pin_banks; |
| for (i = 0; i < ctrl->nr_banks; ++i, ++bdata, ++bank) { |
| bank->type = bdata->type; |
| bank->pctl_offset = bdata->pctl_offset; |
| bank->nr_pins = bdata->nr_pins; |
| bank->eint_func = bdata->eint_func; |
| bank->eint_type = bdata->eint_type; |
| bank->eint_mask = bdata->eint_mask; |
| bank->eint_offset = bdata->eint_offset; |
| bank->name = bdata->name; |
| |
| raw_spin_lock_init(&bank->slock); |
| bank->drvdata = d; |
| bank->pin_base = d->nr_pins; |
| d->nr_pins += bank->nr_pins; |
| |
| bank->eint_base = virt_base[0]; |
| bank->pctl_base = virt_base[bdata->pctl_res_idx]; |
| } |
| /* |
| * Legacy platforms should provide only one resource with IO memory. |
| * Store it as virt_base because legacy driver needs to access it |
| * through samsung_pinctrl_drv_data. |
| */ |
| d->virt_base = virt_base[0]; |
| |
| for_each_child_of_node(node, np) { |
| if (!of_find_property(np, "gpio-controller", NULL)) |
| continue; |
| bank = d->pin_banks; |
| for (i = 0; i < d->nr_banks; ++i, ++bank) { |
| if (of_node_name_eq(np, bank->name)) { |
| bank->of_node = np; |
| break; |
| } |
| } |
| } |
| |
| d->pin_base = pin_base; |
| pin_base += d->nr_pins; |
| |
| return ctrl; |
| } |
| |
| static int samsung_pinctrl_probe(struct platform_device *pdev) |
| { |
| struct samsung_pinctrl_drv_data *drvdata; |
| const struct samsung_pin_ctrl *ctrl; |
| struct device *dev = &pdev->dev; |
| struct resource *res; |
| int ret; |
| |
| drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| if (!drvdata) |
| return -ENOMEM; |
| |
| ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev); |
| if (IS_ERR(ctrl)) { |
| dev_err(&pdev->dev, "driver data not available\n"); |
| return PTR_ERR(ctrl); |
| } |
| drvdata->dev = dev; |
| |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (res) |
| drvdata->irq = res->start; |
| |
| if (ctrl->retention_data) { |
| drvdata->retention_ctrl = ctrl->retention_data->init(drvdata, |
| ctrl->retention_data); |
| if (IS_ERR(drvdata->retention_ctrl)) |
| return PTR_ERR(drvdata->retention_ctrl); |
| } |
| |
| ret = samsung_pinctrl_register(pdev, drvdata); |
| if (ret) |
| return ret; |
| |
| ret = samsung_gpiolib_register(pdev, drvdata); |
| if (ret) { |
| samsung_pinctrl_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; |
| } |
| |
| /* |
| * samsung_pinctrl_suspend - save pinctrl state for suspend |
| * |
| * Save data for all banks handled by this device. |
| */ |
| static int __maybe_unused samsung_pinctrl_suspend(struct device *dev) |
| { |
| struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev); |
| int i; |
| |
| for (i = 0; i < drvdata->nr_banks; i++) { |
| struct samsung_pin_bank *bank = &drvdata->pin_banks[i]; |
| void __iomem *reg = bank->pctl_base + bank->pctl_offset; |
| const u8 *offs = bank->type->reg_offset; |
| const u8 *widths = bank->type->fld_width; |
| enum pincfg_type type; |
| |
| /* Registers without a powerdown config aren't lost */ |
| if (!widths[PINCFG_TYPE_CON_PDN]) |
| continue; |
| |
| for (type = 0; type < PINCFG_TYPE_NUM; type++) |
| if (widths[type]) |
| bank->pm_save[type] = readl(reg + offs[type]); |
| |
| if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) { |
| /* Some banks have two config registers */ |
| bank->pm_save[PINCFG_TYPE_NUM] = |
| readl(reg + offs[PINCFG_TYPE_FUNC] + 4); |
| pr_debug("Save %s @ %p (con %#010x %08x)\n", |
| bank->name, reg, |
| bank->pm_save[PINCFG_TYPE_FUNC], |
| bank->pm_save[PINCFG_TYPE_NUM]); |
| } else { |
| pr_debug("Save %s @ %p (con %#010x)\n", bank->name, |
| reg, bank->pm_save[PINCFG_TYPE_FUNC]); |
| } |
| } |
| |
| if (drvdata->suspend) |
| drvdata->suspend(drvdata); |
| if (drvdata->retention_ctrl && drvdata->retention_ctrl->enable) |
| drvdata->retention_ctrl->enable(drvdata); |
| |
| return 0; |
| } |
| |
| /* |
| * samsung_pinctrl_resume - restore pinctrl state from suspend |
| * |
| * Restore one of the banks that was saved during suspend. |
| * |
| * We don't bother doing anything complicated to avoid glitching lines since |
| * we're called before pad retention is turned off. |
| */ |
| static int __maybe_unused samsung_pinctrl_resume(struct device *dev) |
| { |
| struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev); |
| int i; |
| |
| if (drvdata->resume) |
| drvdata->resume(drvdata); |
| |
| for (i = 0; i < drvdata->nr_banks; i++) { |
| struct samsung_pin_bank *bank = &drvdata->pin_banks[i]; |
| void __iomem *reg = bank->pctl_base + bank->pctl_offset; |
| const u8 *offs = bank->type->reg_offset; |
| const u8 *widths = bank->type->fld_width; |
| enum pincfg_type type; |
| |
| /* Registers without a powerdown config aren't lost */ |
| if (!widths[PINCFG_TYPE_CON_PDN]) |
| continue; |
| |
| if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) { |
| /* Some banks have two config registers */ |
| pr_debug("%s @ %p (con %#010x %08x => %#010x %08x)\n", |
| bank->name, reg, |
| readl(reg + offs[PINCFG_TYPE_FUNC]), |
| readl(reg + offs[PINCFG_TYPE_FUNC] + 4), |
| bank->pm_save[PINCFG_TYPE_FUNC], |
| bank->pm_save[PINCFG_TYPE_NUM]); |
| writel(bank->pm_save[PINCFG_TYPE_NUM], |
| reg + offs[PINCFG_TYPE_FUNC] + 4); |
| } else { |
| pr_debug("%s @ %p (con %#010x => %#010x)\n", bank->name, |
| reg, readl(reg + offs[PINCFG_TYPE_FUNC]), |
| bank->pm_save[PINCFG_TYPE_FUNC]); |
| } |
| for (type = 0; type < PINCFG_TYPE_NUM; type++) |
| if (widths[type]) |
| writel(bank->pm_save[type], reg + offs[type]); |
| } |
| |
| if (drvdata->retention_ctrl && drvdata->retention_ctrl->disable) |
| drvdata->retention_ctrl->disable(drvdata); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id samsung_pinctrl_dt_match[] = { |
| #ifdef CONFIG_PINCTRL_EXYNOS_ARM |
| { .compatible = "samsung,exynos3250-pinctrl", |
| .data = &exynos3250_of_data }, |
| { .compatible = "samsung,exynos4210-pinctrl", |
| .data = &exynos4210_of_data }, |
| { .compatible = "samsung,exynos4x12-pinctrl", |
| .data = &exynos4x12_of_data }, |
| { .compatible = "samsung,exynos5250-pinctrl", |
| .data = &exynos5250_of_data }, |
| { .compatible = "samsung,exynos5260-pinctrl", |
| .data = &exynos5260_of_data }, |
| { .compatible = "samsung,exynos5410-pinctrl", |
| .data = &exynos5410_of_data }, |
| { .compatible = "samsung,exynos5420-pinctrl", |
| .data = &exynos5420_of_data }, |
| { .compatible = "samsung,s5pv210-pinctrl", |
| .data = &s5pv210_of_data }, |
| #endif |
| #ifdef CONFIG_PINCTRL_EXYNOS_ARM64 |
| { .compatible = "samsung,exynos5433-pinctrl", |
| .data = &exynos5433_of_data }, |
| { .compatible = "samsung,exynos7-pinctrl", |
| .data = &exynos7_of_data }, |
| { .compatible = "samsung,exynos850-pinctrl", |
| .data = &exynos850_of_data }, |
| #endif |
| #ifdef CONFIG_PINCTRL_S3C64XX |
| { .compatible = "samsung,s3c64xx-pinctrl", |
| .data = &s3c64xx_of_data }, |
| #endif |
| #ifdef CONFIG_PINCTRL_S3C24XX |
| { .compatible = "samsung,s3c2412-pinctrl", |
| .data = &s3c2412_of_data }, |
| { .compatible = "samsung,s3c2416-pinctrl", |
| .data = &s3c2416_of_data }, |
| { .compatible = "samsung,s3c2440-pinctrl", |
| .data = &s3c2440_of_data }, |
| { .compatible = "samsung,s3c2450-pinctrl", |
| .data = &s3c2450_of_data }, |
| #endif |
| {}, |
| }; |
| |
| static const struct dev_pm_ops samsung_pinctrl_pm_ops = { |
| SET_LATE_SYSTEM_SLEEP_PM_OPS(samsung_pinctrl_suspend, |
| samsung_pinctrl_resume) |
| }; |
| |
| static struct platform_driver samsung_pinctrl_driver = { |
| .probe = samsung_pinctrl_probe, |
| .driver = { |
| .name = "samsung-pinctrl", |
| .of_match_table = samsung_pinctrl_dt_match, |
| .suppress_bind_attrs = true, |
| .pm = &samsung_pinctrl_pm_ops, |
| }, |
| }; |
| |
| static int __init samsung_pinctrl_drv_register(void) |
| { |
| return platform_driver_register(&samsung_pinctrl_driver); |
| } |
| postcore_initcall(samsung_pinctrl_drv_register); |