+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-//
-// pin-controller/pin-mux/pin-config/gpio-driver for Samsung's EXYNOS5440 SoC.
-//
-// Author: Thomas Abraham <thomas.ab@samsung.com>
-//
-// Copyright (c) 2012 Samsung Electronics Co., Ltd.
-// http://www.samsung.com
-
-#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/device.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/interrupt.h>
-#include <linux/irqdomain.h>
-#include <linux/of_irq.h>
-#include "../core.h"
-
-/* EXYNOS5440 GPIO and Pinctrl register offsets */
-#define GPIO_MUX 0x00
-#define GPIO_IE 0x04
-#define GPIO_INT 0x08
-#define GPIO_TYPE 0x0C
-#define GPIO_VAL 0x10
-#define GPIO_OE 0x14
-#define GPIO_IN 0x18
-#define GPIO_PE 0x1C
-#define GPIO_PS 0x20
-#define GPIO_SR 0x24
-#define GPIO_DS0 0x28
-#define GPIO_DS1 0x2C
-
-#define EXYNOS5440_MAX_PINS 23
-#define EXYNOS5440_MAX_GPIO_INT 8
-#define PIN_NAME_LENGTH 10
-
-#define GROUP_SUFFIX "-grp"
-#define FUNCTION_SUFFIX "-mux"
-
-/*
- * pin configuration type and its value are packed together into a 16-bits.
- * The upper 8-bits represent the configuration type and the lower 8-bits
- * hold the value of the configuration type.
- */
-#define PINCFG_TYPE_MASK 0xFF
-#define PINCFG_VALUE_SHIFT 8
-#define PINCFG_VALUE_MASK (0xFF << PINCFG_VALUE_SHIFT)
-#define PINCFG_PACK(type, value) (((value) << PINCFG_VALUE_SHIFT) | type)
-#define PINCFG_UNPACK_TYPE(cfg) ((cfg) & PINCFG_TYPE_MASK)
-#define PINCFG_UNPACK_VALUE(cfg) (((cfg) & PINCFG_VALUE_MASK) >> \
- PINCFG_VALUE_SHIFT)
-
-/**
- * enum pincfg_type - possible pin configuration types supported.
- * @PINCFG_TYPE_PUD: Pull up/down configuration.
- * @PINCFG_TYPE_DRV: Drive strength configuration.
- * @PINCFG_TYPE_SKEW_RATE: Skew rate configuration.
- * @PINCFG_TYPE_INPUT_TYPE: Pin input type configuration.
- */
-enum pincfg_type {
- PINCFG_TYPE_PUD,
- PINCFG_TYPE_DRV,
- PINCFG_TYPE_SKEW_RATE,
- PINCFG_TYPE_INPUT_TYPE
-};
-
-/**
- * struct exynos5440_pin_group: represent group of pins for pincfg setting.
- * @name: name of the pin group, used to lookup the group.
- * @pins: the pins included in this group.
- * @num_pins: number of pins included in this group.
- */
-struct exynos5440_pin_group {
- const char *name;
- const unsigned int *pins;
- u8 num_pins;
-};
-
-/**
- * struct exynos5440_pmx_func: represent a pin function.
- * @name: name of the pin function, used to lookup the function.
- * @groups: one or more names of pin groups that provide this function.
- * @num_groups: number of groups included in @groups.
- * @function: the function number to be programmed when selected.
- */
-struct exynos5440_pmx_func {
- const char *name;
- const char **groups;
- u8 num_groups;
- unsigned long function;
-};
-
-/**
- * struct exynos5440_pinctrl_priv_data: driver's private runtime data.
- * @reg_base: ioremapped based address of the register space.
- * @gc: gpio chip registered with gpiolib.
- * @pin_groups: list of pin groups parsed from device tree.
- * @nr_groups: number of pin groups available.
- * @pmx_functions: list of pin functions parsed from device tree.
- * @nr_functions: number of pin functions available.
- * @range: gpio range to register with pinctrl
- */
-struct exynos5440_pinctrl_priv_data {
- void __iomem *reg_base;
- struct gpio_chip *gc;
- struct irq_domain *irq_domain;
-
- const struct exynos5440_pin_group *pin_groups;
- unsigned int nr_groups;
- const struct exynos5440_pmx_func *pmx_functions;
- unsigned int nr_functions;
- struct pinctrl_gpio_range range;
-};
-
-/**
- * struct exynos5440_gpio_intr_data: private data for gpio interrupts.
- * @priv: driver's private runtime data.
- * @gpio_int: gpio interrupt number.
- */
-struct exynos5440_gpio_intr_data {
- struct exynos5440_pinctrl_priv_data *priv;
- unsigned int gpio_int;
-};
-
-/* list of all possible config options supported */
-static struct pin_config {
- char *prop_cfg;
- unsigned int cfg_type;
-} pcfgs[] = {
- { "samsung,exynos5440-pin-pud", PINCFG_TYPE_PUD },
- { "samsung,exynos5440-pin-drv", PINCFG_TYPE_DRV },
- { "samsung,exynos5440-pin-skew-rate", PINCFG_TYPE_SKEW_RATE },
- { "samsung,exynos5440-pin-input-type", PINCFG_TYPE_INPUT_TYPE },
-};
-
-/* check if the selector is a valid pin group selector */
-static int exynos5440_get_group_count(struct pinctrl_dev *pctldev)
-{
- struct exynos5440_pinctrl_priv_data *priv;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- return priv->nr_groups;
-}
-
-/* return the name of the group selected by the group selector */
-static const char *exynos5440_get_group_name(struct pinctrl_dev *pctldev,
- unsigned selector)
-{
- struct exynos5440_pinctrl_priv_data *priv;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- return priv->pin_groups[selector].name;
-}
-
-/* return the pin numbers associated with the specified group */
-static int exynos5440_get_group_pins(struct pinctrl_dev *pctldev,
- unsigned selector, const unsigned **pins, unsigned *num_pins)
-{
- struct exynos5440_pinctrl_priv_data *priv;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- *pins = priv->pin_groups[selector].pins;
- *num_pins = priv->pin_groups[selector].num_pins;
- return 0;
-}
-
-/* create pinctrl_map entries by parsing device tree nodes */
-static int exynos5440_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,exynos5440-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)
- 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 = kasprintf(GFP_KERNEL, "%s%s", np->name, GROUP_SUFFIX);
- if (!gname)
- goto free_map;
-
- /*
- * 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)
- 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,exynos5440-pin-function", NULL)) {
- fname = kasprintf(GFP_KERNEL,
- "%s%s", np->name, FUNCTION_SUFFIX);
- if (!fname)
- goto free_cfg;
-
- 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 exynos5440_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 exynos5440_pctrl_ops = {
- .get_groups_count = exynos5440_get_group_count,
- .get_group_name = exynos5440_get_group_name,
- .get_group_pins = exynos5440_get_group_pins,
- .dt_node_to_map = exynos5440_dt_node_to_map,
- .dt_free_map = exynos5440_dt_free_map,
-};
-
-/* check if the selector is a valid pin function selector */
-static int exynos5440_get_functions_count(struct pinctrl_dev *pctldev)
-{
- struct exynos5440_pinctrl_priv_data *priv;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- return priv->nr_functions;
-}
-
-/* return the name of the pin function specified */
-static const char *exynos5440_pinmux_get_fname(struct pinctrl_dev *pctldev,
- unsigned selector)
-{
- struct exynos5440_pinctrl_priv_data *priv;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- return priv->pmx_functions[selector].name;
-}
-
-/* return the groups associated for the specified function selector */
-static int exynos5440_pinmux_get_groups(struct pinctrl_dev *pctldev,
- unsigned selector, const char * const **groups,
- unsigned * const num_groups)
-{
- struct exynos5440_pinctrl_priv_data *priv;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- *groups = priv->pmx_functions[selector].groups;
- *num_groups = priv->pmx_functions[selector].num_groups;
- return 0;
-}
-
-/* enable or disable a pinmux function */
-static void exynos5440_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
- unsigned group, bool enable)
-{
- struct exynos5440_pinctrl_priv_data *priv;
- void __iomem *base;
- u32 function;
- u32 data;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- base = priv->reg_base;
- function = priv->pmx_functions[selector].function;
-
- data = readl(base + GPIO_MUX);
- if (enable)
- data |= (1 << function);
- else
- data &= ~(1 << function);
- writel(data, base + GPIO_MUX);
-}
-
-/* enable a specified pinmux by writing to registers */
-static int exynos5440_pinmux_set_mux(struct pinctrl_dev *pctldev,
- unsigned selector,
- unsigned group)
-{
- exynos5440_pinmux_setup(pctldev, selector, group, true);
- return 0;
-}
-
-/*
- * 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 exynos5440_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
- struct pinctrl_gpio_range *range, unsigned offset, bool input)
-{
- return 0;
-}
-
-/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
-static const struct pinmux_ops exynos5440_pinmux_ops = {
- .get_functions_count = exynos5440_get_functions_count,
- .get_function_name = exynos5440_pinmux_get_fname,
- .get_function_groups = exynos5440_pinmux_get_groups,
- .set_mux = exynos5440_pinmux_set_mux,
- .gpio_set_direction = exynos5440_pinmux_gpio_set_direction,
-};
-
-/* set the pin config settings for a specified pin */
-static int exynos5440_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
- unsigned long *configs,
- unsigned num_configs)
-{
- struct exynos5440_pinctrl_priv_data *priv;
- void __iomem *base;
- enum pincfg_type cfg_type;
- u32 cfg_value;
- u32 data;
- int i;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- base = priv->reg_base;
-
- for (i = 0; i < num_configs; i++) {
- cfg_type = PINCFG_UNPACK_TYPE(configs[i]);
- cfg_value = PINCFG_UNPACK_VALUE(configs[i]);
-
- switch (cfg_type) {
- case PINCFG_TYPE_PUD:
- /* first set pull enable/disable bit */
- data = readl(base + GPIO_PE);
- data &= ~(1 << pin);
- if (cfg_value)
- data |= (1 << pin);
- writel(data, base + GPIO_PE);
-
- /* then set pull up/down bit */
- data = readl(base + GPIO_PS);
- data &= ~(1 << pin);
- if (cfg_value == 2)
- data |= (1 << pin);
- writel(data, base + GPIO_PS);
- break;
-
- case PINCFG_TYPE_DRV:
- /* set the first bit of the drive strength */
- data = readl(base + GPIO_DS0);
- data &= ~(1 << pin);
- data |= ((cfg_value & 1) << pin);
- writel(data, base + GPIO_DS0);
- cfg_value >>= 1;
-
- /* set the second bit of the driver strength */
- data = readl(base + GPIO_DS1);
- data &= ~(1 << pin);
- data |= ((cfg_value & 1) << pin);
- writel(data, base + GPIO_DS1);
- break;
- case PINCFG_TYPE_SKEW_RATE:
- data = readl(base + GPIO_SR);
- data &= ~(1 << pin);
- data |= ((cfg_value & 1) << pin);
- writel(data, base + GPIO_SR);
- break;
- case PINCFG_TYPE_INPUT_TYPE:
- data = readl(base + GPIO_TYPE);
- data &= ~(1 << pin);
- data |= ((cfg_value & 1) << pin);
- writel(data, base + GPIO_TYPE);
- break;
- default:
- WARN_ON(1);
- return -EINVAL;
- }
- } /* for each config */
-
- return 0;
-}
-
-/* get the pin config settings for a specified pin */
-static int exynos5440_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
- unsigned long *config)
-{
- struct exynos5440_pinctrl_priv_data *priv;
- void __iomem *base;
- enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
- u32 data;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- base = priv->reg_base;
-
- switch (cfg_type) {
- case PINCFG_TYPE_PUD:
- data = readl(base + GPIO_PE);
- data = (data >> pin) & 1;
- if (!data)
- *config = 0;
- else
- *config = ((readl(base + GPIO_PS) >> pin) & 1) + 1;
- break;
- case PINCFG_TYPE_DRV:
- data = readl(base + GPIO_DS0);
- data = (data >> pin) & 1;
- *config = data;
- data = readl(base + GPIO_DS1);
- data = (data >> pin) & 1;
- *config |= (data << 1);
- break;
- case PINCFG_TYPE_SKEW_RATE:
- data = readl(base + GPIO_SR);
- *config = (data >> pin) & 1;
- break;
- case PINCFG_TYPE_INPUT_TYPE:
- data = readl(base + GPIO_TYPE);
- *config = (data >> pin) & 1;
- break;
- default:
- WARN_ON(1);
- return -EINVAL;
- }
-
- return 0;
-}
-
-/* set the pin config settings for a specified pin group */
-static int exynos5440_pinconf_group_set(struct pinctrl_dev *pctldev,
- unsigned group, unsigned long *configs,
- unsigned num_configs)
-{
- struct exynos5440_pinctrl_priv_data *priv;
- const unsigned int *pins;
- unsigned int cnt;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- pins = priv->pin_groups[group].pins;
-
- for (cnt = 0; cnt < priv->pin_groups[group].num_pins; cnt++)
- exynos5440_pinconf_set(pctldev, pins[cnt], configs,
- num_configs);
-
- return 0;
-}
-
-/* get the pin config settings for a specified pin group */
-static int exynos5440_pinconf_group_get(struct pinctrl_dev *pctldev,
- unsigned int group, unsigned long *config)
-{
- struct exynos5440_pinctrl_priv_data *priv;
- const unsigned int *pins;
-
- priv = pinctrl_dev_get_drvdata(pctldev);
- pins = priv->pin_groups[group].pins;
- exynos5440_pinconf_get(pctldev, pins[0], config);
- return 0;
-}
-
-/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
-static const struct pinconf_ops exynos5440_pinconf_ops = {
- .pin_config_get = exynos5440_pinconf_get,
- .pin_config_set = exynos5440_pinconf_set,
- .pin_config_group_get = exynos5440_pinconf_group_get,
- .pin_config_group_set = exynos5440_pinconf_group_set,
-};
-
-/* gpiolib gpio_set callback function */
-static void exynos5440_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
-{
- struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
- void __iomem *base = priv->reg_base;
- u32 data;
-
- data = readl(base + GPIO_VAL);
- data &= ~(1 << offset);
- if (value)
- data |= 1 << offset;
- writel(data, base + GPIO_VAL);
-}
-
-/* gpiolib gpio_get callback function */
-static int exynos5440_gpio_get(struct gpio_chip *gc, unsigned offset)
-{
- struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
- void __iomem *base = priv->reg_base;
- u32 data;
-
- data = readl(base + GPIO_IN);
- data >>= offset;
- data &= 1;
- return data;
-}
-
-/* gpiolib gpio_direction_input callback function */
-static int exynos5440_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
-{
- struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
- void __iomem *base = priv->reg_base;
- u32 data;
-
- /* first disable the data output enable on this pin */
- data = readl(base + GPIO_OE);
- data &= ~(1 << offset);
- writel(data, base + GPIO_OE);
-
- /* now enable input on this pin */
- data = readl(base + GPIO_IE);
- data |= 1 << offset;
- writel(data, base + GPIO_IE);
- return 0;
-}
-
-/* gpiolib gpio_direction_output callback function */
-static int exynos5440_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
- int value)
-{
- struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
- void __iomem *base = priv->reg_base;
- u32 data;
-
- exynos5440_gpio_set(gc, offset, value);
-
- /* first disable the data input enable on this pin */
- data = readl(base + GPIO_IE);
- data &= ~(1 << offset);
- writel(data, base + GPIO_IE);
-
- /* now enable output on this pin */
- data = readl(base + GPIO_OE);
- data |= 1 << offset;
- writel(data, base + GPIO_OE);
- return 0;
-}
-
-/* gpiolib gpio_to_irq callback function */
-static int exynos5440_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
-{
- struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
- unsigned int virq;
-
- if (offset < 16 || offset > 23)
- return -ENXIO;
-
- if (!priv->irq_domain)
- return -ENXIO;
-
- virq = irq_create_mapping(priv->irq_domain, offset - 16);
- return virq ? : -ENXIO;
-}
-
-/* parse the pin numbers listed in the 'samsung,exynos5440-pins' property */
-static int exynos5440_pinctrl_parse_dt_pins(struct platform_device *pdev,
- struct device_node *cfg_np, unsigned int **pin_list,
- unsigned int *npins)
-{
- struct device *dev = &pdev->dev;
- struct property *prop;
-
- prop = of_find_property(cfg_np, "samsung,exynos5440-pins", NULL);
- if (!prop)
- return -ENOENT;
-
- *npins = prop->length / sizeof(unsigned long);
- if (!*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)
- return -ENOMEM;
-
- return of_property_read_u32_array(cfg_np, "samsung,exynos5440-pins",
- *pin_list, *npins);
-}
-
-/*
- * Parse the information about all the available pin groups and pin functions
- * from device node of the pin-controller.
- */
-static int exynos5440_pinctrl_parse_dt(struct platform_device *pdev,
- struct exynos5440_pinctrl_priv_data *priv)
-{
- struct device *dev = &pdev->dev;
- struct device_node *dev_np = dev->of_node;
- struct device_node *cfg_np;
- struct exynos5440_pin_group *groups, *grp;
- struct exynos5440_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)
- return -EINVAL;
-
- grp = groups;
-
- functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
- if (!functions)
- 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;
-
- ret = exynos5440_pinctrl_parse_dt_pins(pdev, cfg_np,
- &pin_list, &npins);
- if (ret) {
- gname = NULL;
- goto skip_to_pin_function;
- }
-
- /* derive pin group name from the node name */
- gname = devm_kasprintf(dev, GFP_KERNEL,
- "%s%s", cfg_np->name, GROUP_SUFFIX);
- if (!gname)
- return -ENOMEM;
-
- grp->name = gname;
- grp->pins = pin_list;
- grp->num_pins = npins;
- grp++;
-
-skip_to_pin_function:
- ret = of_property_read_u32(cfg_np, "samsung,exynos5440-pin-function",
- &function);
- if (ret)
- continue;
-
- /* derive function name from the node name */
- fname = devm_kasprintf(dev, GFP_KERNEL,
- "%s%s", cfg_np->name, FUNCTION_SUFFIX);
- if (!fname)
- return -ENOMEM;
-
- func->name = fname;
- func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
- if (!func->groups)
- return -ENOMEM;
- func->groups[0] = gname;
- func->num_groups = gname ? 1 : 0;
- func->function = function;
- func++;
- func_idx++;
- }
-
- priv->pin_groups = groups;
- priv->nr_groups = grp_cnt;
- priv->pmx_functions = functions;
- priv->nr_functions = func_idx;
- return 0;
-}
-
-/* register the pinctrl interface with the pinctrl subsystem */
-static int exynos5440_pinctrl_register(struct platform_device *pdev,
- struct exynos5440_pinctrl_priv_data *priv)
-{
- struct device *dev = &pdev->dev;
- struct pinctrl_desc *ctrldesc;
- struct pinctrl_dev *pctl_dev;
- struct pinctrl_pin_desc *pindesc, *pdesc;
- char *pin_names;
- int pin, ret;
-
- ctrldesc = devm_kzalloc(dev, sizeof(*ctrldesc), GFP_KERNEL);
- if (!ctrldesc)
- return -ENOMEM;
-
- ctrldesc->name = "exynos5440-pinctrl";
- ctrldesc->owner = THIS_MODULE;
- ctrldesc->pctlops = &exynos5440_pctrl_ops;
- ctrldesc->pmxops = &exynos5440_pinmux_ops;
- ctrldesc->confops = &exynos5440_pinconf_ops;
-
- pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
- EXYNOS5440_MAX_PINS, GFP_KERNEL);
- if (!pindesc)
- return -ENOMEM;
- ctrldesc->pins = pindesc;
- ctrldesc->npins = EXYNOS5440_MAX_PINS;
-
- /* dynamically populate the pin number and pin name for pindesc */
- for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
- pdesc->number = pin;
-
- /*
- * 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 *
- ctrldesc->npins, GFP_KERNEL);
- if (!pin_names)
- return -ENOMEM;
-
- /* for each pin, set the name of the pin */
- for (pin = 0; pin < ctrldesc->npins; pin++) {
- snprintf(pin_names, 6, "gpio%02d", pin);
- pdesc = pindesc + pin;
- pdesc->name = pin_names;
- pin_names += PIN_NAME_LENGTH;
- }
-
- ret = exynos5440_pinctrl_parse_dt(pdev, priv);
- if (ret)
- return ret;
-
- pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc, priv);
- if (IS_ERR(pctl_dev)) {
- dev_err(&pdev->dev, "could not register pinctrl driver\n");
- return PTR_ERR(pctl_dev);
- }
-
- priv->range.name = "exynos5440-pctrl-gpio-range";
- priv->range.id = 0;
- priv->range.base = 0;
- priv->range.npins = EXYNOS5440_MAX_PINS;
- priv->range.gc = priv->gc;
- pinctrl_add_gpio_range(pctl_dev, &priv->range);
- return 0;
-}
-
-/* register the gpiolib interface with the gpiolib subsystem */
-static int exynos5440_gpiolib_register(struct platform_device *pdev,
- struct exynos5440_pinctrl_priv_data *priv)
-{
- struct gpio_chip *gc;
- int ret;
-
- gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
- if (!gc)
- return -ENOMEM;
-
- priv->gc = gc;
- gc->base = 0;
- gc->ngpio = EXYNOS5440_MAX_PINS;
- gc->parent = &pdev->dev;
- gc->set = exynos5440_gpio_set;
- gc->get = exynos5440_gpio_get;
- gc->direction_input = exynos5440_gpio_direction_input;
- gc->direction_output = exynos5440_gpio_direction_output;
- gc->to_irq = exynos5440_gpio_to_irq;
- gc->label = "gpiolib-exynos5440";
- gc->owner = THIS_MODULE;
- ret = gpiochip_add_data(gc, priv);
- if (ret) {
- dev_err(&pdev->dev, "failed to register gpio_chip %s, error "
- "code: %d\n", gc->label, ret);
- return ret;
- }
-
- return 0;
-}
-
-/* unregister the gpiolib interface with the gpiolib subsystem */
-static int exynos5440_gpiolib_unregister(struct platform_device *pdev,
- struct exynos5440_pinctrl_priv_data *priv)
-{
- gpiochip_remove(priv->gc);
- return 0;
-}
-
-static void exynos5440_gpio_irq_unmask(struct irq_data *irqd)
-{
- struct exynos5440_pinctrl_priv_data *d;
- unsigned long gpio_int;
-
- d = irq_data_get_irq_chip_data(irqd);
- gpio_int = readl(d->reg_base + GPIO_INT);
- gpio_int |= 1 << irqd->hwirq;
- writel(gpio_int, d->reg_base + GPIO_INT);
-}
-
-static void exynos5440_gpio_irq_mask(struct irq_data *irqd)
-{
- struct exynos5440_pinctrl_priv_data *d;
- unsigned long gpio_int;
-
- d = irq_data_get_irq_chip_data(irqd);
- gpio_int = readl(d->reg_base + GPIO_INT);
- gpio_int &= ~(1 << irqd->hwirq);
- writel(gpio_int, d->reg_base + GPIO_INT);
-}
-
-/* irq_chip for gpio interrupts */
-static struct irq_chip exynos5440_gpio_irq_chip = {
- .name = "exynos5440_gpio_irq_chip",
- .irq_unmask = exynos5440_gpio_irq_unmask,
- .irq_mask = exynos5440_gpio_irq_mask,
-};
-
-/* interrupt handler for GPIO interrupts 0..7 */
-static irqreturn_t exynos5440_gpio_irq(int irq, void *data)
-{
- struct exynos5440_gpio_intr_data *intd = data;
- struct exynos5440_pinctrl_priv_data *d = intd->priv;
- int virq;
-
- virq = irq_linear_revmap(d->irq_domain, intd->gpio_int);
- if (!virq)
- return IRQ_NONE;
- generic_handle_irq(virq);
- return IRQ_HANDLED;
-}
-
-static int exynos5440_gpio_irq_map(struct irq_domain *h, unsigned int virq,
- irq_hw_number_t hw)
-{
- struct exynos5440_pinctrl_priv_data *d = h->host_data;
-
- irq_set_chip_data(virq, d);
- irq_set_chip_and_handler(virq, &exynos5440_gpio_irq_chip,
- handle_level_irq);
- return 0;
-}
-
-/* irq domain callbacks for gpio interrupt controller */
-static const struct irq_domain_ops exynos5440_gpio_irqd_ops = {
- .map = exynos5440_gpio_irq_map,
- .xlate = irq_domain_xlate_twocell,
-};
-
-/* setup handling of gpio interrupts */
-static int exynos5440_gpio_irq_init(struct platform_device *pdev,
- struct exynos5440_pinctrl_priv_data *priv)
-{
- struct device *dev = &pdev->dev;
- struct exynos5440_gpio_intr_data *intd;
- int i, irq, ret;
-
- intd = devm_kzalloc(dev, sizeof(*intd) * EXYNOS5440_MAX_GPIO_INT,
- GFP_KERNEL);
- if (!intd)
- return -ENOMEM;
-
- for (i = 0; i < EXYNOS5440_MAX_GPIO_INT; i++) {
- irq = irq_of_parse_and_map(dev->of_node, i);
- if (irq <= 0) {
- dev_err(dev, "irq parsing failed\n");
- return -EINVAL;
- }
-
- intd->gpio_int = i;
- intd->priv = priv;
- ret = devm_request_irq(dev, irq, exynos5440_gpio_irq,
- 0, dev_name(dev), intd++);
- if (ret) {
- dev_err(dev, "irq request failed\n");
- return -ENXIO;
- }
- }
-
- priv->irq_domain = irq_domain_add_linear(dev->of_node,
- EXYNOS5440_MAX_GPIO_INT,
- &exynos5440_gpio_irqd_ops, priv);
- if (!priv->irq_domain) {
- dev_err(dev, "failed to create irq domain\n");
- return -ENXIO;
- }
-
- return 0;
-}
-
-static int exynos5440_pinctrl_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct exynos5440_pinctrl_priv_data *priv;
- struct resource *res;
- int ret;
-
- if (!dev->of_node) {
- dev_err(dev, "device tree node not found\n");
- return -ENODEV;
- }
-
- priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- priv->reg_base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(priv->reg_base))
- return PTR_ERR(priv->reg_base);
-
- ret = exynos5440_gpiolib_register(pdev, priv);
- if (ret)
- return ret;
-
- ret = exynos5440_pinctrl_register(pdev, priv);
- if (ret) {
- exynos5440_gpiolib_unregister(pdev, priv);
- return ret;
- }
-
- ret = exynos5440_gpio_irq_init(pdev, priv);
- if (ret) {
- dev_err(dev, "failed to setup gpio interrupts\n");
- return ret;
- }
-
- platform_set_drvdata(pdev, priv);
- dev_info(dev, "EXYNOS5440 pinctrl driver registered\n");
- return 0;
-}
-
-static const struct of_device_id exynos5440_pinctrl_dt_match[] = {
- { .compatible = "samsung,exynos5440-pinctrl" },
- {},
-};
-
-static struct platform_driver exynos5440_pinctrl_driver = {
- .probe = exynos5440_pinctrl_probe,
- .driver = {
- .name = "exynos5440-pinctrl",
- .of_match_table = exynos5440_pinctrl_dt_match,
- .suppress_bind_attrs = true,
- },
-};
-
-static int __init exynos5440_pinctrl_drv_register(void)
-{
- return platform_driver_register(&exynos5440_pinctrl_driver);
-}
-postcore_initcall(exynos5440_pinctrl_drv_register);
projects / platform / kernel / linux-rpi.git / commitdiff