diff options
Diffstat (limited to 'drivers/pinctrl/vt8500/pinctrl-wmt.c')
| -rw-r--r-- | drivers/pinctrl/vt8500/pinctrl-wmt.c | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/drivers/pinctrl/vt8500/pinctrl-wmt.c b/drivers/pinctrl/vt8500/pinctrl-wmt.c new file mode 100644 index 000000000..c08318a5a --- /dev/null +++ b/drivers/pinctrl/vt8500/pinctrl-wmt.c @@ -0,0 +1,609 @@ +/* + * Pinctrl driver for the Wondermedia SoC's + * + * Copyright (c) 2013 Tony Prisk <linux@prisktech.co.nz> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/machine.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "pinctrl-wmt.h" + +static inline void wmt_setbits(struct wmt_pinctrl_data *data, u32 reg, + u32 mask) +{ + u32 val; + + val = readl_relaxed(data->base + reg); + val |= mask; + writel_relaxed(val, data->base + reg); +} + +static inline void wmt_clearbits(struct wmt_pinctrl_data *data, u32 reg, + u32 mask) +{ + u32 val; + + val = readl_relaxed(data->base + reg); + val &= ~mask; + writel_relaxed(val, data->base + reg); +} + +enum wmt_func_sel { + WMT_FSEL_GPIO_IN = 0, + WMT_FSEL_GPIO_OUT = 1, + WMT_FSEL_ALT = 2, + WMT_FSEL_COUNT = 3, +}; + +static const char * const wmt_functions[WMT_FSEL_COUNT] = { + [WMT_FSEL_GPIO_IN] = "gpio_in", + [WMT_FSEL_GPIO_OUT] = "gpio_out", + [WMT_FSEL_ALT] = "alt", +}; + +static int wmt_pmx_get_functions_count(struct pinctrl_dev *pctldev) +{ + return WMT_FSEL_COUNT; +} + +static const char *wmt_pmx_get_function_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + return wmt_functions[selector]; +} + +static int wmt_pmx_get_function_groups(struct pinctrl_dev *pctldev, + unsigned selector, + const char * const **groups, + unsigned * const num_groups) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + /* every pin does every function */ + *groups = data->groups; + *num_groups = data->ngroups; + + return 0; +} + +static int wmt_set_pinmux(struct wmt_pinctrl_data *data, unsigned func, + unsigned pin) +{ + u32 bank = WMT_BANK_FROM_PIN(pin); + u32 bit = WMT_BIT_FROM_PIN(pin); + u32 reg_en = data->banks[bank].reg_en; + u32 reg_dir = data->banks[bank].reg_dir; + + if (reg_dir == NO_REG) { + dev_err(data->dev, "pin:%d no direction register defined\n", + pin); + return -EINVAL; + } + + /* + * If reg_en == NO_REG, we assume it is a dedicated GPIO and cannot be + * disabled (as on VT8500) and that no alternate function is available. + */ + switch (func) { + case WMT_FSEL_GPIO_IN: + if (reg_en != NO_REG) + wmt_setbits(data, reg_en, BIT(bit)); + wmt_clearbits(data, reg_dir, BIT(bit)); + break; + case WMT_FSEL_GPIO_OUT: + if (reg_en != NO_REG) + wmt_setbits(data, reg_en, BIT(bit)); + wmt_setbits(data, reg_dir, BIT(bit)); + break; + case WMT_FSEL_ALT: + if (reg_en == NO_REG) { + dev_err(data->dev, "pin:%d no alt function available\n", + pin); + return -EINVAL; + } + wmt_clearbits(data, reg_en, BIT(bit)); + } + + return 0; +} + +static int wmt_pmx_set_mux(struct pinctrl_dev *pctldev, + unsigned func_selector, + unsigned group_selector) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + u32 pinnum = data->pins[group_selector].number; + + return wmt_set_pinmux(data, func_selector, pinnum); +} + +static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned offset) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + /* disable by setting GPIO_IN */ + wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset); +} + +static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned offset, + bool input) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT), + offset); + + return 0; +} + +static const struct pinmux_ops wmt_pinmux_ops = { + .get_functions_count = wmt_pmx_get_functions_count, + .get_function_name = wmt_pmx_get_function_name, + .get_function_groups = wmt_pmx_get_function_groups, + .set_mux = wmt_pmx_set_mux, + .gpio_disable_free = wmt_pmx_gpio_disable_free, + .gpio_set_direction = wmt_pmx_gpio_set_direction, +}; + +static int wmt_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + return data->ngroups; +} + +static const char *wmt_get_group_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + return data->groups[selector]; +} + +static int wmt_get_group_pins(struct pinctrl_dev *pctldev, + unsigned selector, + const unsigned **pins, + unsigned *num_pins) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + *pins = &data->pins[selector].number; + *num_pins = 1; + + return 0; +} + +static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin) +{ + int i; + + for (i = 0; i < data->npins; i++) { + if (data->pins[i].number == pin) + return i; + } + + return -EINVAL; +} + +static int wmt_pctl_dt_node_to_map_func(struct wmt_pinctrl_data *data, + struct device_node *np, + u32 pin, u32 fnum, + struct pinctrl_map **maps) +{ + int group; + struct pinctrl_map *map = *maps; + + if (fnum >= ARRAY_SIZE(wmt_functions)) { + dev_err(data->dev, "invalid wm,function %d\n", fnum); + return -EINVAL; + } + + group = wmt_pctl_find_group_by_pin(data, pin); + if (group < 0) { + dev_err(data->dev, "unable to match pin %d to group\n", pin); + return group; + } + + map->type = PIN_MAP_TYPE_MUX_GROUP; + map->data.mux.group = data->groups[group]; + map->data.mux.function = wmt_functions[fnum]; + (*maps)++; + + return 0; +} + +static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data, + struct device_node *np, + u32 pin, u32 pull, + struct pinctrl_map **maps) +{ + int group; + unsigned long *configs; + struct pinctrl_map *map = *maps; + + if (pull > 2) { + dev_err(data->dev, "invalid wm,pull %d\n", pull); + return -EINVAL; + } + + group = wmt_pctl_find_group_by_pin(data, pin); + if (group < 0) { + dev_err(data->dev, "unable to match pin %d to group\n", pin); + return group; + } + + configs = kzalloc(sizeof(*configs), GFP_KERNEL); + if (!configs) + return -ENOMEM; + + switch (pull) { + case 0: + configs[0] = PIN_CONFIG_BIAS_DISABLE; + break; + case 1: + configs[0] = PIN_CONFIG_BIAS_PULL_DOWN; + break; + case 2: + configs[0] = PIN_CONFIG_BIAS_PULL_UP; + break; + default: + configs[0] = PIN_CONFIG_BIAS_DISABLE; + dev_err(data->dev, "invalid pull state %d - disabling\n", pull); + } + + map->type = PIN_MAP_TYPE_CONFIGS_PIN; + map->data.configs.group_or_pin = data->groups[group]; + map->data.configs.configs = configs; + map->data.configs.num_configs = 1; + (*maps)++; + + return 0; +} + +static void wmt_pctl_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *maps, + unsigned num_maps) +{ + int i; + + for (i = 0; i < num_maps; i++) + if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN) + kfree(maps[i].data.configs.configs); + + kfree(maps); +} + +static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned *num_maps) +{ + struct pinctrl_map *maps, *cur_map; + struct property *pins, *funcs, *pulls; + u32 pin, func, pull; + int num_pins, num_funcs, num_pulls, maps_per_pin; + int i, err; + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + + pins = of_find_property(np, "wm,pins", NULL); + if (!pins) { + dev_err(data->dev, "missing wmt,pins property\n"); + return -EINVAL; + } + + funcs = of_find_property(np, "wm,function", NULL); + pulls = of_find_property(np, "wm,pull", NULL); + + if (!funcs && !pulls) { + dev_err(data->dev, "neither wm,function nor wm,pull specified\n"); + return -EINVAL; + } + + /* + * The following lines calculate how many values are defined for each + * of the properties. + */ + num_pins = pins->length / sizeof(u32); + num_funcs = funcs ? (funcs->length / sizeof(u32)) : 0; + num_pulls = pulls ? (pulls->length / sizeof(u32)) : 0; + + if (num_funcs > 1 && num_funcs != num_pins) { + dev_err(data->dev, "wm,function must have 1 or %d entries\n", + num_pins); + return -EINVAL; + } + + if (num_pulls > 1 && num_pulls != num_pins) { + dev_err(data->dev, "wm,pull must have 1 or %d entries\n", + num_pins); + return -EINVAL; + } + + maps_per_pin = 0; + if (num_funcs) + maps_per_pin++; + if (num_pulls) + maps_per_pin++; + + cur_map = maps = kcalloc(num_pins * maps_per_pin, sizeof(*maps), + GFP_KERNEL); + if (!maps) + return -ENOMEM; + + for (i = 0; i < num_pins; i++) { + err = of_property_read_u32_index(np, "wm,pins", i, &pin); + if (err) + goto fail; + + if (pin >= (data->nbanks * 32)) { + dev_err(data->dev, "invalid wm,pins value\n"); + err = -EINVAL; + goto fail; + } + + if (num_funcs) { + err = of_property_read_u32_index(np, "wm,function", + (num_funcs > 1 ? i : 0), &func); + if (err) + goto fail; + + err = wmt_pctl_dt_node_to_map_func(data, np, pin, func, + &cur_map); + if (err) + goto fail; + } + + if (num_pulls) { + err = of_property_read_u32_index(np, "wm,pull", + (num_pulls > 1 ? i : 0), &pull); + if (err) + goto fail; + + err = wmt_pctl_dt_node_to_map_pull(data, np, pin, pull, + &cur_map); + if (err) + goto fail; + } + } + *map = maps; + *num_maps = num_pins * maps_per_pin; + return 0; + +/* + * The fail path removes any maps that have been allocated. The fail path is + * only called from code after maps has been kzalloc'd. It is also safe to + * pass 'num_pins * maps_per_pin' as the map count even though we probably + * failed before all the mappings were read as all maps are allocated at once, + * and configs are only allocated for .type = PIN_MAP_TYPE_CONFIGS_PIN - there + * is no failpath where a config can be allocated without .type being set. + */ +fail: + wmt_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin); + return err; +} + +static const struct pinctrl_ops wmt_pctl_ops = { + .get_groups_count = wmt_get_groups_count, + .get_group_name = wmt_get_group_name, + .get_group_pins = wmt_get_group_pins, + .dt_node_to_map = wmt_pctl_dt_node_to_map, + .dt_free_map = wmt_pctl_dt_free_map, +}; + +static int wmt_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *config) +{ + return -ENOTSUPP; +} + +static int wmt_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *configs, unsigned num_configs) +{ + struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param; + u32 arg; + u32 bank = WMT_BANK_FROM_PIN(pin); + u32 bit = WMT_BIT_FROM_PIN(pin); + u32 reg_pull_en = data->banks[bank].reg_pull_en; + u32 reg_pull_cfg = data->banks[bank].reg_pull_cfg; + int i; + + if ((reg_pull_en == NO_REG) || (reg_pull_cfg == NO_REG)) { + dev_err(data->dev, "bias functions not supported on pin %d\n", + pin); + return -EINVAL; + } + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + if ((param == PIN_CONFIG_BIAS_PULL_DOWN) || + (param == PIN_CONFIG_BIAS_PULL_UP)) { + if (arg == 0) + param = PIN_CONFIG_BIAS_DISABLE; + } + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + wmt_clearbits(data, reg_pull_en, BIT(bit)); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + wmt_clearbits(data, reg_pull_cfg, BIT(bit)); + wmt_setbits(data, reg_pull_en, BIT(bit)); + break; + case PIN_CONFIG_BIAS_PULL_UP: + wmt_setbits(data, reg_pull_cfg, BIT(bit)); + wmt_setbits(data, reg_pull_en, BIT(bit)); + break; + default: + dev_err(data->dev, "unknown pinconf param\n"); + return -EINVAL; + } + } /* for each config */ + + return 0; +} + +static const struct pinconf_ops wmt_pinconf_ops = { + .pin_config_get = wmt_pinconf_get, + .pin_config_set = wmt_pinconf_set, +}; + +static struct pinctrl_desc wmt_desc = { + .owner = THIS_MODULE, + .name = "pinctrl-wmt", + .pctlops = &wmt_pctl_ops, + .pmxops = &wmt_pinmux_ops, + .confops = &wmt_pinconf_ops, +}; + +static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset) +{ + struct wmt_pinctrl_data *data = gpiochip_get_data(chip); + u32 bank = WMT_BANK_FROM_PIN(offset); + u32 bit = WMT_BIT_FROM_PIN(offset); + u32 reg_dir = data->banks[bank].reg_dir; + u32 val; + + val = readl_relaxed(data->base + reg_dir); + if (val & BIT(bit)) + return GPIOF_DIR_OUT; + else + return GPIOF_DIR_IN; +} + +static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset) +{ + struct wmt_pinctrl_data *data = gpiochip_get_data(chip); + u32 bank = WMT_BANK_FROM_PIN(offset); + u32 bit = WMT_BIT_FROM_PIN(offset); + u32 reg_data_in = data->banks[bank].reg_data_in; + + if (reg_data_in == NO_REG) { + dev_err(data->dev, "no data in register defined\n"); + return -EINVAL; + } + + return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit)); +} + +static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset, + int val) +{ + struct wmt_pinctrl_data *data = gpiochip_get_data(chip); + u32 bank = WMT_BANK_FROM_PIN(offset); + u32 bit = WMT_BIT_FROM_PIN(offset); + u32 reg_data_out = data->banks[bank].reg_data_out; + + if (reg_data_out == NO_REG) { + dev_err(data->dev, "no data out register defined\n"); + return; + } + + if (val) + wmt_setbits(data, reg_data_out, BIT(bit)); + else + wmt_clearbits(data, reg_data_out, BIT(bit)); +} + +static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_gpio_direction_input(chip->base + offset); +} + +static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + wmt_gpio_set_value(chip, offset, value); + return pinctrl_gpio_direction_output(chip->base + offset); +} + +static const struct gpio_chip wmt_gpio_chip = { + .label = "gpio-wmt", + .owner = THIS_MODULE, + .request = gpiochip_generic_request, + .free = gpiochip_generic_free, + .get_direction = wmt_gpio_get_direction, + .direction_input = wmt_gpio_direction_input, + .direction_output = wmt_gpio_direction_output, + .get = wmt_gpio_get_value, + .set = wmt_gpio_set_value, + .can_sleep = false, +}; + +int wmt_pinctrl_probe(struct platform_device *pdev, + struct wmt_pinctrl_data *data) +{ + int err; + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->base)) + return PTR_ERR(data->base); + + wmt_desc.pins = data->pins; + wmt_desc.npins = data->npins; + + data->gpio_chip = wmt_gpio_chip; + data->gpio_chip.parent = &pdev->dev; + data->gpio_chip.of_node = pdev->dev.of_node; + data->gpio_chip.ngpio = data->nbanks * 32; + + platform_set_drvdata(pdev, data); + + data->dev = &pdev->dev; + + data->pctl_dev = devm_pinctrl_register(&pdev->dev, &wmt_desc, data); + if (IS_ERR(data->pctl_dev)) { + dev_err(&pdev->dev, "Failed to register pinctrl\n"); + return PTR_ERR(data->pctl_dev); + } + + err = gpiochip_add_data(&data->gpio_chip, data); + if (err) { + dev_err(&pdev->dev, "could not add GPIO chip\n"); + return err; + } + + err = gpiochip_add_pin_range(&data->gpio_chip, dev_name(data->dev), + 0, 0, data->nbanks * 32); + if (err) + goto fail_range; + + dev_info(&pdev->dev, "Pin controller initialized\n"); + + return 0; + +fail_range: + gpiochip_remove(&data->gpio_chip); + return err; +} |