diff options
Diffstat (limited to 'drivers/pinctrl/samsung/pinctrl-samsung.c')
| -rw-r--r-- | drivers/pinctrl/samsung/pinctrl-samsung.c | 1358 |
1 files changed, 1358 insertions, 0 deletions
diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c new file mode 100644 index 000000000..bd13b5ef2 --- /dev/null +++ b/drivers/pinctrl/samsung/pinctrl-samsung.c @@ -0,0 +1,1358 @@ +// 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/property.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 "../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 |= PIN_CON_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->fwnode = bank->fwnode; + 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]); +} + +static void samsung_banks_node_put(struct samsung_pinctrl_drv_data *d) +{ + struct samsung_pin_bank *bank; + unsigned int i; + + bank = d->pin_banks; + for (i = 0; i < d->nr_banks; ++i, ++bank) + fwnode_handle_put(bank->fwnode); +} + +/* + * Iterate over all driver pin banks to find one matching the name of node, + * skipping optional "-gpio" node suffix. When found, assign node to the bank. + */ +static void samsung_banks_node_get(struct device *dev, struct samsung_pinctrl_drv_data *d) +{ + const char *suffix = "-gpio-bank"; + struct samsung_pin_bank *bank; + struct fwnode_handle *child; + /* Pin bank names are up to 4 characters */ + char node_name[20]; + unsigned int i; + size_t len; + + bank = d->pin_banks; + for (i = 0; i < d->nr_banks; ++i, ++bank) { + strscpy(node_name, bank->name, sizeof(node_name)); + len = strlcat(node_name, suffix, sizeof(node_name)); + if (len >= sizeof(node_name)) { + dev_err(dev, "Too long pin bank name '%s', ignoring\n", + bank->name); + continue; + } + + for_each_gpiochip_node(dev, child) { + struct device_node *np = to_of_node(child); + + if (of_node_name_eq(np, node_name)) + break; + if (of_node_name_eq(np, bank->name)) + break; + } + + if (child) + bank->fwnode = child; + else + dev_warn(dev, "Missing node for bank %s - invalid DTB\n", + bank->name); + /* child reference dropped in samsung_drop_banks_of_node() */ + } +} + +/* 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) +{ + 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]; + + samsung_banks_node_get(&pdev->dev, d); + + 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; + 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; + + ret = platform_get_irq_optional(pdev, 0); + if (ret < 0 && ret != -ENXIO) + return ret; + if (ret > 0) + drvdata->irq = ret; + + if (ctrl->retention_data) { + drvdata->retention_ctrl = ctrl->retention_data->init(drvdata, + ctrl->retention_data); + if (IS_ERR(drvdata->retention_ctrl)) { + ret = PTR_ERR(drvdata->retention_ctrl); + goto err_put_banks; + } + } + + ret = samsung_pinctrl_register(pdev, drvdata); + if (ret) + goto err_put_banks; + + if (ctrl->eint_gpio_init) + ctrl->eint_gpio_init(drvdata); + if (ctrl->eint_wkup_init) + ctrl->eint_wkup_init(drvdata); + + ret = samsung_gpiolib_register(pdev, drvdata); + if (ret) + goto err_unregister; + + platform_set_drvdata(pdev, drvdata); + + return 0; + +err_unregister: + samsung_pinctrl_unregister(pdev, drvdata); +err_put_banks: + samsung_banks_node_put(drvdata); + return ret; +} + +/* + * 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,exynos7885-pinctrl", + .data = &exynos7885_of_data }, + { .compatible = "samsung,exynos850-pinctrl", + .data = &exynos850_of_data }, + { .compatible = "samsung,exynosautov9-pinctrl", + .data = &exynosautov9_of_data }, + { .compatible = "tesla,fsd-pinctrl", + .data = &fsd_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); |