| /* |
| * 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 <linux/irqdomain.h> |
| #include <linux/spinlock.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 */ |
| static 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 }, |
| }; |
| |
| static unsigned int pin_base; |
| |
| static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc) |
| { |
| return container_of(gc, struct samsung_pin_bank, gpio_chip); |
| } |
| |
| /* 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 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, |
| }; |
| |
| /* 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->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; |
| } |
| |
| /* 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; |
| unsigned long flags; |
| |
| 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++) { |
| struct samsung_pin_bank_type *type; |
| |
| pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->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; |
| } |
| |
| spin_lock_irqsave(&bank->slock, flags); |
| |
| data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]); |
| data &= ~(mask << shift); |
| if (enable) |
| data |= drvdata->pin_groups[group].func << shift; |
| writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]); |
| |
| spin_unlock_irqrestore(&bank->slock, flags); |
| } |
| } |
| |
| /* 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_type *type; |
| struct samsung_pin_bank *bank; |
| struct samsung_pinctrl_drv_data *drvdata; |
| void __iomem *reg; |
| u32 data, pin_offset, mask, shift; |
| unsigned long flags; |
| |
| bank = gc_to_pin_bank(range->gc); |
| type = bank->type; |
| drvdata = pinctrl_dev_get_drvdata(pctldev); |
| |
| pin_offset = offset - bank->pin_base; |
| reg = drvdata->virt_base + bank->pctl_offset + |
| type->reg_offset[PINCFG_TYPE_FUNC]; |
| |
| 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; |
| } |
| |
| spin_lock_irqsave(&bank->slock, flags); |
| |
| data = readl(reg); |
| data &= ~(mask << shift); |
| if (!input) |
| data |= FUNC_OUTPUT << shift; |
| writel(data, reg); |
| |
| spin_unlock_irqrestore(&bank->slock, flags); |
| |
| 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, |
| .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_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->ctrl->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]; |
| |
| 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); |
| } |
| |
| 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 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 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, |
| }; |
| |
| /* gpiolib gpio_set callback function */ |
| static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value) |
| { |
| struct samsung_pin_bank *bank = gc_to_pin_bank(gc); |
| struct samsung_pin_bank_type *type = bank->type; |
| unsigned long flags; |
| void __iomem *reg; |
| u32 data; |
| |
| reg = bank->drvdata->virt_base + bank->pctl_offset; |
| |
| spin_lock_irqsave(&bank->slock, flags); |
| |
| 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]); |
| |
| 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 = gc_to_pin_bank(gc); |
| struct samsung_pin_bank_type *type = bank->type; |
| |
| reg = bank->drvdata->virt_base + bank->pctl_offset; |
| |
| data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]); |
| data >>= 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); |
| } |
| |
| /* |
| * 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 = gc_to_pin_bank(gc); |
| unsigned int virq; |
| |
| if (!bank->irq_domain) |
| return -ENXIO; |
| |
| virq = irq_create_mapping(bank->irq_domain, offset); |
| |
| return (virq) ? : -ENXIO; |
| } |
| |
| /* |
| * 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 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 (IS_ERR_VALUE(*npins)) { |
| 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 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, "samsung,pins", 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 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; |
| |
| /* 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; |
| } |
| |
| for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) { |
| pin_bank = &drvdata->ctrl->pin_banks[bank]; |
| pin_bank->grange.name = pin_bank->name; |
| pin_bank->grange.id = bank; |
| pin_bank->grange.pin_base = pin_bank->pin_base; |
| pin_bank->grange.base = pin_bank->gpio_chip.base; |
| pin_bank->grange.npins = pin_bank->gpio_chip.ngpio; |
| pin_bank->grange.gc = &pin_bank->gpio_chip; |
| pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange); |
| } |
| |
| ret = samsung_pinctrl_parse_dt(pdev, drvdata); |
| if (ret) { |
| pinctrl_unregister(drvdata->pctl_dev); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct gpio_chip samsung_gpiolib_chip = { |
| .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_ctrl *ctrl = drvdata->ctrl; |
| struct samsung_pin_bank *bank = ctrl->pin_banks; |
| struct gpio_chip *gc; |
| int ret; |
| int i; |
| |
| for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { |
| bank->gpio_chip = samsung_gpiolib_chip; |
| |
| gc = &bank->gpio_chip; |
| gc->base = ctrl->base + bank->pin_base; |
| gc->ngpio = bank->nr_pins; |
| gc->dev = &pdev->dev; |
| gc->of_node = bank->of_node; |
| gc->label = bank->name; |
| |
| ret = gpiochip_add(gc); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n", |
| gc->label, ret); |
| goto fail; |
| } |
| } |
| |
| return 0; |
| |
| fail: |
| for (--i, --bank; i >= 0; --i, --bank) |
| if (gpiochip_remove(&bank->gpio_chip)) |
| dev_err(&pdev->dev, "gpio chip %s remove failed\n", |
| bank->gpio_chip.label); |
| return ret; |
| } |
| |
| /* unregister the gpiolib interface with the gpiolib subsystem */ |
| static int samsung_gpiolib_unregister(struct platform_device *pdev, |
| struct samsung_pinctrl_drv_data *drvdata) |
| { |
| struct samsung_pin_ctrl *ctrl = drvdata->ctrl; |
| struct samsung_pin_bank *bank = ctrl->pin_banks; |
| int ret = 0; |
| int i; |
| |
| for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank) |
| ret = gpiochip_remove(&bank->gpio_chip); |
| |
| if (ret) |
| dev_err(&pdev->dev, "gpio chip remove failed\n"); |
| |
| return ret; |
| } |
| |
| 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 samsung_pinctrl_drv_data *d, |
| struct platform_device *pdev) |
| { |
| int id; |
| const struct of_device_id *match; |
| struct device_node *node = pdev->dev.of_node; |
| struct device_node *np; |
| struct samsung_pin_ctrl *ctrl; |
| struct samsung_pin_bank *bank; |
| int i; |
| |
| id = of_alias_get_id(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); |
| ctrl = (struct samsung_pin_ctrl *)match->data + id; |
| |
| bank = ctrl->pin_banks; |
| for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { |
| spin_lock_init(&bank->slock); |
| bank->drvdata = d; |
| bank->pin_base = ctrl->nr_pins; |
| ctrl->nr_pins += bank->nr_pins; |
| } |
| |
| for_each_child_of_node(node, np) { |
| if (!of_find_property(np, "gpio-controller", NULL)) |
| continue; |
| bank = ctrl->pin_banks; |
| for (i = 0; i < ctrl->nr_banks; ++i, ++bank) { |
| if (!strcmp(bank->name, np->name)) { |
| bank->of_node = np; |
| break; |
| } |
| } |
| } |
| |
| ctrl->base = pin_base; |
| pin_base += ctrl->nr_pins; |
| |
| return ctrl; |
| } |
| |
| static int 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; |
| } |
| |
| 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; |
| } |
| |
| ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev); |
| if (!ctrl) { |
| dev_err(&pdev->dev, "driver data not available\n"); |
| return -EINVAL; |
| } |
| 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_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(drvdata->virt_base)) |
| return PTR_ERR(drvdata->virt_base); |
| |
| 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[] = { |
| #ifdef CONFIG_PINCTRL_EXYNOS |
| { .compatible = "samsung,exynos4210-pinctrl", |
| .data = (void *)exynos4210_pin_ctrl }, |
| { .compatible = "samsung,exynos4x12-pinctrl", |
| .data = (void *)exynos4x12_pin_ctrl }, |
| { .compatible = "samsung,exynos5250-pinctrl", |
| .data = (void *)exynos5250_pin_ctrl }, |
| #endif |
| #ifdef CONFIG_PINCTRL_S3C64XX |
| { .compatible = "samsung,s3c64xx-pinctrl", |
| .data = s3c64xx_pin_ctrl }, |
| #endif |
| #ifdef CONFIG_PINCTRL_S3C24XX |
| { .compatible = "samsung,s3c2412-pinctrl", |
| .data = s3c2412_pin_ctrl }, |
| { .compatible = "samsung,s3c2416-pinctrl", |
| .data = s3c2416_pin_ctrl }, |
| { .compatible = "samsung,s3c2440-pinctrl", |
| .data = s3c2440_pin_ctrl }, |
| { .compatible = "samsung,s3c2450-pinctrl", |
| .data = s3c2450_pin_ctrl }, |
| #endif |
| {}, |
| }; |
| 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"); |