diff options
Diffstat (limited to 'drivers/pinctrl/nxp/pinctrl-s32cc.c')
| -rw-r--r-- | drivers/pinctrl/nxp/pinctrl-s32cc.c | 973 |
1 files changed, 973 insertions, 0 deletions
diff --git a/drivers/pinctrl/nxp/pinctrl-s32cc.c b/drivers/pinctrl/nxp/pinctrl-s32cc.c new file mode 100644 index 000000000000..8373468719b6 --- /dev/null +++ b/drivers/pinctrl/nxp/pinctrl-s32cc.c @@ -0,0 +1,973 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Core driver for the S32 CC (Common Chassis) pin controller + * + * Copyright 2017-2022 NXP + * Copyright (C) 2022 SUSE LLC + * Copyright 2015-2016 Freescale Semiconductor, Inc. + */ + +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/pinctrl/machine.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/regmap.h> +#include <linux/seq_file.h> +#include <linux/slab.h> + +#include "../core.h" +#include "../pinconf.h" +#include "../pinctrl-utils.h" +#include "pinctrl-s32.h" + +#define S32_PIN_ID_SHIFT 4 +#define S32_PIN_ID_MASK GENMASK(31, S32_PIN_ID_SHIFT) + +#define S32_MSCR_SSS_MASK GENMASK(2, 0) +#define S32_MSCR_PUS BIT(12) +#define S32_MSCR_PUE BIT(13) +#define S32_MSCR_SRE(X) (((X) & GENMASK(3, 0)) << 14) +#define S32_MSCR_IBE BIT(19) +#define S32_MSCR_ODE BIT(20) +#define S32_MSCR_OBE BIT(21) + +static struct regmap_config s32_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static u32 get_pin_no(u32 pinmux) +{ + return (pinmux & S32_PIN_ID_MASK) >> S32_PIN_ID_SHIFT; +} + +static u32 get_pin_func(u32 pinmux) +{ + return pinmux & GENMASK(3, 0); +} + +struct s32_pinctrl_mem_region { + struct regmap *map; + const struct s32_pin_range *pin_range; + char name[8]; +}; + +/* + * Holds pin configuration for GPIO's. + * @pin_id: Pin ID for this GPIO + * @config: Pin settings + * @list: Linked list entry for each gpio pin + */ +struct gpio_pin_config { + unsigned int pin_id; + unsigned int config; + struct list_head list; +}; + +/* + * Pad config save/restore for power suspend/resume. + */ +struct s32_pinctrl_context { + unsigned int *pads; +}; + +/* + * @dev: a pointer back to containing device + * @pctl: a pointer to the pinctrl device structure + * @regions: reserved memory regions with start/end pin + * @info: structure containing information about the pin + * @gpio_configs: Saved configurations for GPIO pins + * @gpiop_configs_lock: lock for the `gpio_configs` list + * @s32_pinctrl_context: Configuration saved over system sleep + */ +struct s32_pinctrl { + struct device *dev; + struct pinctrl_dev *pctl; + struct s32_pinctrl_mem_region *regions; + struct s32_pinctrl_soc_info *info; + struct list_head gpio_configs; + spinlock_t gpio_configs_lock; +#ifdef CONFIG_PM_SLEEP + struct s32_pinctrl_context saved_context; +#endif +}; + +static struct s32_pinctrl_mem_region * +s32_get_region(struct pinctrl_dev *pctldev, unsigned int pin) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pin_range *pin_range; + unsigned int mem_regions = ipctl->info->mem_regions; + unsigned int i; + + for (i = 0; i < mem_regions; i++) { + pin_range = ipctl->regions[i].pin_range; + if (pin >= pin_range->start && pin <= pin_range->end) + return &ipctl->regions[i]; + } + + return NULL; +} + +static inline int s32_check_pin(struct pinctrl_dev *pctldev, + unsigned int pin) +{ + return s32_get_region(pctldev, pin) ? 0 : -EINVAL; +} + +static inline int s32_regmap_read(struct pinctrl_dev *pctldev, + unsigned int pin, unsigned int *val) +{ + struct s32_pinctrl_mem_region *region; + unsigned int offset; + + region = s32_get_region(pctldev, pin); + if (!region) + return -EINVAL; + + offset = (pin - region->pin_range->start) * + regmap_get_reg_stride(region->map); + + return regmap_read(region->map, offset, val); +} + +static inline int s32_regmap_write(struct pinctrl_dev *pctldev, + unsigned int pin, + unsigned int val) +{ + struct s32_pinctrl_mem_region *region; + unsigned int offset; + + region = s32_get_region(pctldev, pin); + if (!region) + return -EINVAL; + + offset = (pin - region->pin_range->start) * + regmap_get_reg_stride(region->map); + + return regmap_write(region->map, offset, val); + +} + +static inline int s32_regmap_update(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned int mask, unsigned int val) +{ + struct s32_pinctrl_mem_region *region; + unsigned int offset; + + region = s32_get_region(pctldev, pin); + if (!region) + return -EINVAL; + + offset = (pin - region->pin_range->start) * + regmap_get_reg_stride(region->map); + + return regmap_update_bits(region->map, offset, mask, val); +} + +static int s32_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + + return info->ngroups; +} + +static const char *s32_get_group_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + + return info->groups[selector].data.name; +} + +static int s32_get_group_pins(struct pinctrl_dev *pctldev, + unsigned int selector, const unsigned int **pins, + unsigned int *npins) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + + *pins = info->groups[selector].data.pins; + *npins = info->groups[selector].data.npins; + + return 0; +} + +static void s32_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, + unsigned int offset) +{ + seq_printf(s, "%s", dev_name(pctldev->dev)); +} + +static int s32_dt_group_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **map, + unsigned int *reserved_maps, + unsigned int *num_maps, + const char *func_name) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + struct device *dev = ipctl->dev; + unsigned long *cfgs = NULL; + unsigned int n_cfgs, reserve = 1; + int n_pins, ret; + + n_pins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32)); + if (n_pins < 0) { + dev_warn(dev, "Can't find 'pinmux' property in node %pOFn\n", np); + } else if (!n_pins) { + return -EINVAL; + } + + ret = pinconf_generic_parse_dt_config(np, pctldev, &cfgs, &n_cfgs); + if (ret) { + dev_err(dev, "%pOF: could not parse node property\n", np); + return ret; + } + + if (n_cfgs) + reserve++; + + ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, + reserve); + if (ret < 0) + goto free_cfgs; + + ret = pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps, + np->name, func_name); + if (ret < 0) + goto free_cfgs; + + if (n_cfgs) { + ret = pinctrl_utils_add_map_configs(pctldev, map, reserved_maps, + num_maps, np->name, cfgs, n_cfgs, + PIN_MAP_TYPE_CONFIGS_GROUP); + if (ret < 0) + goto free_cfgs; + } + +free_cfgs: + kfree(cfgs); + return ret; +} + +static int s32_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np_config, + struct pinctrl_map **map, + unsigned int *num_maps) +{ + unsigned int reserved_maps; + struct device_node *np; + int ret = 0; + + reserved_maps = 0; + *map = NULL; + *num_maps = 0; + + for_each_available_child_of_node(np_config, np) { + ret = s32_dt_group_node_to_map(pctldev, np, map, + &reserved_maps, num_maps, + np_config->name); + if (ret < 0) + break; + } + + if (ret) + pinctrl_utils_free_map(pctldev, *map, *num_maps); + + return ret; + +} + +static const struct pinctrl_ops s32_pctrl_ops = { + .get_groups_count = s32_get_groups_count, + .get_group_name = s32_get_group_name, + .get_group_pins = s32_get_group_pins, + .pin_dbg_show = s32_pin_dbg_show, + .dt_node_to_map = s32_dt_node_to_map, + .dt_free_map = pinctrl_utils_free_map, +}; + +static int s32_pmx_set(struct pinctrl_dev *pctldev, unsigned int selector, + unsigned int group) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + int i, ret; + struct s32_pin_group *grp; + + /* + * Configure the mux mode for each pin in the group for a specific + * function. + */ + grp = &info->groups[group]; + + dev_dbg(ipctl->dev, "set mux for function %s group %s\n", + info->functions[selector].name, grp->data.name); + + /* Check beforehand so we don't have a partial config. */ + for (i = 0; i < grp->data.npins; i++) { + if (s32_check_pin(pctldev, grp->data.pins[i]) != 0) { + dev_err(info->dev, "invalid pin: %u in group: %u\n", + grp->data.pins[i], group); + return -EINVAL; + } + } + + for (i = 0, ret = 0; i < grp->data.npins && !ret; i++) { + ret = s32_regmap_update(pctldev, grp->data.pins[i], + S32_MSCR_SSS_MASK, grp->pin_sss[i]); + if (ret) { + dev_err(info->dev, "Failed to set pin %u\n", + grp->data.pins[i]); + return ret; + } + } + + return 0; +} + +static int s32_pmx_get_funcs_count(struct pinctrl_dev *pctldev) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + + return info->nfunctions; +} + +static const char *s32_pmx_get_func_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + + return info->functions[selector].name; +} + +static int s32_pmx_get_groups(struct pinctrl_dev *pctldev, + unsigned int selector, + const char * const **groups, + unsigned int * const num_groups) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + + *groups = info->functions[selector].groups; + *num_groups = info->functions[selector].ngroups; + + return 0; +} + +static int s32_pmx_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + struct gpio_pin_config *gpio_pin; + unsigned int config; + unsigned long flags; + int ret; + + ret = s32_regmap_read(pctldev, offset, &config); + if (ret) + return ret; + + /* Save current configuration */ + gpio_pin = kmalloc(sizeof(*gpio_pin), GFP_KERNEL); + if (!gpio_pin) + return -ENOMEM; + + gpio_pin->pin_id = offset; + gpio_pin->config = config; + + spin_lock_irqsave(&ipctl->gpio_configs_lock, flags); + list_add(&gpio_pin->list, &ipctl->gpio_configs); + spin_unlock_irqrestore(&ipctl->gpio_configs_lock, flags); + + /* GPIO pin means SSS = 0 */ + config &= ~S32_MSCR_SSS_MASK; + + return s32_regmap_write(pctldev, offset, config); +} + +static void s32_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + struct gpio_pin_config *gpio_pin, *tmp; + unsigned long flags; + int ret; + + spin_lock_irqsave(&ipctl->gpio_configs_lock, flags); + + list_for_each_entry_safe(gpio_pin, tmp, &ipctl->gpio_configs, list) { + if (gpio_pin->pin_id == offset) { + ret = s32_regmap_write(pctldev, gpio_pin->pin_id, + gpio_pin->config); + if (ret != 0) + goto unlock; + + list_del(&gpio_pin->list); + kfree(gpio_pin); + break; + } + } + +unlock: + spin_unlock_irqrestore(&ipctl->gpio_configs_lock, flags); +} + +static int s32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset, + bool input) +{ + unsigned int config; + unsigned int mask = S32_MSCR_IBE | S32_MSCR_OBE; + + if (input) { + /* Disable output buffer and enable input buffer */ + config = S32_MSCR_IBE; + } else { + /* Disable input buffer and enable output buffer */ + config = S32_MSCR_OBE; + } + + return s32_regmap_update(pctldev, offset, mask, config); +} + +static const struct pinmux_ops s32_pmx_ops = { + .get_functions_count = s32_pmx_get_funcs_count, + .get_function_name = s32_pmx_get_func_name, + .get_function_groups = s32_pmx_get_groups, + .set_mux = s32_pmx_set, + .gpio_request_enable = s32_pmx_gpio_request_enable, + .gpio_disable_free = s32_pmx_gpio_disable_free, + .gpio_set_direction = s32_pmx_gpio_set_direction, +}; + +/* Set the reserved elements as -1 */ +static const int support_slew[] = {208, -1, -1, -1, 166, 150, 133, 83}; + +static int s32_get_slew_regval(int arg) +{ + unsigned int i; + + /* Translate a real slew rate (MHz) to a register value */ + for (i = 0; i < ARRAY_SIZE(support_slew); i++) { + if (arg == support_slew[i]) + return i; + } + + return -EINVAL; +} + +static inline void s32_pin_set_pull(enum pin_config_param param, + unsigned int *mask, unsigned int *config) +{ + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + *config &= ~(S32_MSCR_PUS | S32_MSCR_PUE); + break; + case PIN_CONFIG_BIAS_PULL_UP: + *config |= S32_MSCR_PUS | S32_MSCR_PUE; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + *config &= ~S32_MSCR_PUS; + *config |= S32_MSCR_PUE; + break; + default: + return; + } + + *mask |= S32_MSCR_PUS | S32_MSCR_PUE; +} + +static int s32_parse_pincfg(unsigned long pincfg, unsigned int *mask, + unsigned int *config) +{ + enum pin_config_param param; + u32 arg; + int ret; + + param = pinconf_to_config_param(pincfg); + arg = pinconf_to_config_argument(pincfg); + + switch (param) { + /* All pins are persistent over suspend */ + case PIN_CONFIG_PERSIST_STATE: + return 0; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + *config |= S32_MSCR_ODE; + *mask |= S32_MSCR_ODE; + break; + case PIN_CONFIG_OUTPUT_ENABLE: + if (arg) + *config |= S32_MSCR_OBE; + else + *config &= ~S32_MSCR_OBE; + *mask |= S32_MSCR_OBE; + break; + case PIN_CONFIG_INPUT_ENABLE: + if (arg) + *config |= S32_MSCR_IBE; + else + *config &= ~S32_MSCR_IBE; + *mask |= S32_MSCR_IBE; + break; + case PIN_CONFIG_SLEW_RATE: + ret = s32_get_slew_regval(arg); + if (ret < 0) + return ret; + *config |= S32_MSCR_SRE((u32)ret); + *mask |= S32_MSCR_SRE(~0); + break; + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_BIAS_PULL_DOWN: + s32_pin_set_pull(param, mask, config); + break; + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + *config &= ~(S32_MSCR_ODE | S32_MSCR_OBE | S32_MSCR_IBE); + *mask |= S32_MSCR_ODE | S32_MSCR_OBE | S32_MSCR_IBE; + s32_pin_set_pull(param, mask, config); + break; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int s32_pinconf_mscr_update(struct pinctrl_dev *pctldev, + unsigned int pin_id, + unsigned long *configs, + unsigned int num_configs) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + unsigned int config = 0, mask = 0; + int i, ret; + + ret = s32_check_pin(pctldev, pin_id); + if (ret) + return ret; + + dev_dbg(ipctl->dev, "pinconf set pin %s with %u configs\n", + pin_get_name(pctldev, pin_id), num_configs); + + for (i = 0; i < num_configs; i++) { + ret = s32_parse_pincfg(configs[i], &mask, &config); + if (ret) + return ret; + } + + if (!config && !mask) + return 0; + + dev_dbg(ipctl->dev, "update: pin %u cfg 0x%x\n", pin_id, config); + + return s32_regmap_update(pctldev, pin_id, mask, config); +} + +static int s32_pinconf_get(struct pinctrl_dev *pctldev, + unsigned int pin_id, + unsigned long *config) +{ + return s32_regmap_read(pctldev, pin_id, (unsigned int *)config); +} + +static int s32_pinconf_set(struct pinctrl_dev *pctldev, + unsigned int pin_id, unsigned long *configs, + unsigned int num_configs) +{ + return s32_pinconf_mscr_update(pctldev, pin_id, configs, + num_configs); +} + +static int s32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned int selector, + unsigned long *configs, unsigned int num_configs) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + struct s32_pin_group *grp; + int i, ret; + + grp = &info->groups[selector]; + for (i = 0; i < grp->data.npins; i++) { + ret = s32_pinconf_mscr_update(pctldev, grp->data.pins[i], + configs, num_configs); + if (ret) + return ret; + } + + return 0; +} + +static void s32_pinconf_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned int pin_id) +{ + unsigned int config; + int ret; + + ret = s32_regmap_read(pctldev, pin_id, &config); + if (ret) + return; + + seq_printf(s, "0x%x", config); +} + +static void s32_pinconf_group_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned int selector) +{ + struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + struct s32_pin_group *grp; + unsigned int config; + const char *name; + int i, ret; + + seq_puts(s, "\n"); + grp = &info->groups[selector]; + for (i = 0; i < grp->data.npins; i++) { + name = pin_get_name(pctldev, grp->data.pins[i]); + ret = s32_regmap_read(pctldev, grp->data.pins[i], &config); + if (ret) + return; + seq_printf(s, "%s: 0x%x\n", name, config); + } +} + +static const struct pinconf_ops s32_pinconf_ops = { + .pin_config_get = s32_pinconf_get, + .pin_config_set = s32_pinconf_set, + .pin_config_group_set = s32_pconf_group_set, + .pin_config_dbg_show = s32_pinconf_dbg_show, + .pin_config_group_dbg_show = s32_pinconf_group_dbg_show, +}; + +#ifdef CONFIG_PM_SLEEP +static bool s32_pinctrl_should_save(struct s32_pinctrl *ipctl, + unsigned int pin) +{ + const struct pin_desc *pd = pin_desc_get(ipctl->pctl, pin); + + if (!pd) + return false; + + /* + * Only restore the pin if it is actually in use by the kernel (or + * by userspace). + */ + if (pd->mux_owner || pd->gpio_owner) + return true; + + return false; +} + +int s32_pinctrl_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct s32_pinctrl *ipctl = platform_get_drvdata(pdev); + const struct pinctrl_pin_desc *pin; + const struct s32_pinctrl_soc_info *info = ipctl->info; + struct s32_pinctrl_context *saved_context = &ipctl->saved_context; + int i; + int ret; + unsigned int config; + + for (i = 0; i < info->npins; i++) { + pin = &info->pins[i]; + + if (!s32_pinctrl_should_save(ipctl, pin->number)) + continue; + + ret = s32_regmap_read(ipctl->pctl, pin->number, &config); + if (ret) + return -EINVAL; + + saved_context->pads[i] = config; + } + + return 0; +} + +int s32_pinctrl_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct s32_pinctrl *ipctl = platform_get_drvdata(pdev); + const struct s32_pinctrl_soc_info *info = ipctl->info; + const struct pinctrl_pin_desc *pin; + struct s32_pinctrl_context *saved_context = &ipctl->saved_context; + int ret, i; + + for (i = 0; i < info->npins; i++) { + pin = &info->pins[i]; + + if (!s32_pinctrl_should_save(ipctl, pin->number)) + continue; + + ret = s32_regmap_write(ipctl->pctl, pin->number, + saved_context->pads[i]); + if (ret) + return ret; + } + + return 0; +} +#endif + +static int s32_pinctrl_parse_groups(struct device_node *np, + struct s32_pin_group *grp, + struct s32_pinctrl_soc_info *info) +{ + const __be32 *p; + struct device *dev; + struct property *prop; + unsigned int *pins, *sss; + int i, npins; + u32 pinmux; + + dev = info->dev; + + dev_dbg(dev, "group: %pOFn\n", np); + + /* Initialise group */ + grp->data.name = np->name; + + npins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32)); + if (npins < 0) { + dev_err(dev, "Failed to read 'pinmux' property in node %s.\n", + grp->data.name); + return -EINVAL; + } + if (!npins) { + dev_err(dev, "The group %s has no pins.\n", grp->data.name); + return -EINVAL; + } + + grp->data.npins = npins; + + pins = devm_kcalloc(info->dev, npins, sizeof(*pins), GFP_KERNEL); + sss = devm_kcalloc(info->dev, npins, sizeof(*sss), GFP_KERNEL); + if (!pins || !sss) + return -ENOMEM; + + i = 0; + of_property_for_each_u32(np, "pinmux", prop, p, pinmux) { + pins[i] = get_pin_no(pinmux); + sss[i] = get_pin_func(pinmux); + + dev_dbg(info->dev, "pin: 0x%x, sss: 0x%x", pins[i], sss[i]); + i++; + } + + grp->data.pins = pins; + grp->pin_sss = sss; + + return 0; +} + +static int s32_pinctrl_parse_functions(struct device_node *np, + struct s32_pinctrl_soc_info *info, + u32 index) +{ + struct device_node *child; + struct pinfunction *func; + struct s32_pin_group *grp; + const char **groups; + u32 i = 0; + int ret = 0; + + dev_dbg(info->dev, "parse function(%u): %pOFn\n", index, np); + + func = &info->functions[index]; + + /* Initialise function */ + func->name = np->name; + func->ngroups = of_get_child_count(np); + if (func->ngroups == 0) { + dev_err(info->dev, "no groups defined in %pOF\n", np); + return -EINVAL; + } + + groups = devm_kcalloc(info->dev, func->ngroups, + sizeof(*func->groups), GFP_KERNEL); + if (!groups) + return -ENOMEM; + + for_each_child_of_node(np, child) { + groups[i] = child->name; + grp = &info->groups[info->grp_index++]; + ret = s32_pinctrl_parse_groups(child, grp, info); + if (ret) + return ret; + i++; + } + + func->groups = groups; + + return 0; +} + +static int s32_pinctrl_probe_dt(struct platform_device *pdev, + struct s32_pinctrl *ipctl) +{ + struct s32_pinctrl_soc_info *info = ipctl->info; + struct device_node *np = pdev->dev.of_node; + struct device_node *child; + struct resource *res; + struct regmap *map; + void __iomem *base; + int mem_regions = info->mem_regions; + int ret; + u32 nfuncs = 0; + u32 i = 0; + + if (!np) + return -ENODEV; + + if (mem_regions == 0) { + dev_err(&pdev->dev, "mem_regions is 0\n"); + return -EINVAL; + } + + ipctl->regions = devm_kcalloc(&pdev->dev, mem_regions, + sizeof(*ipctl->regions), GFP_KERNEL); + if (!ipctl->regions) + return -ENOMEM; + + for (i = 0; i < mem_regions; i++) { + base = devm_platform_get_and_ioremap_resource(pdev, i, &res); + if (IS_ERR(base)) + return PTR_ERR(base); + + snprintf(ipctl->regions[i].name, + sizeof(ipctl->regions[i].name), "map%u", i); + + s32_regmap_config.name = ipctl->regions[i].name; + s32_regmap_config.max_register = resource_size(res) - + s32_regmap_config.reg_stride; + + map = devm_regmap_init_mmio(&pdev->dev, base, + &s32_regmap_config); + if (IS_ERR(map)) { + dev_err(&pdev->dev, "Failed to init regmap[%u]\n", i); + return PTR_ERR(map); + } + + ipctl->regions[i].map = map; + ipctl->regions[i].pin_range = &info->mem_pin_ranges[i]; + } + + nfuncs = of_get_child_count(np); + if (nfuncs <= 0) { + dev_err(&pdev->dev, "no functions defined\n"); + return -EINVAL; + } + + info->nfunctions = nfuncs; + info->functions = devm_kcalloc(&pdev->dev, nfuncs, + sizeof(*info->functions), GFP_KERNEL); + if (!info->functions) + return -ENOMEM; + + info->ngroups = 0; + for_each_child_of_node(np, child) + info->ngroups += of_get_child_count(child); + + info->groups = devm_kcalloc(&pdev->dev, info->ngroups, + sizeof(*info->groups), GFP_KERNEL); + if (!info->groups) + return -ENOMEM; + + i = 0; + for_each_child_of_node(np, child) { + ret = s32_pinctrl_parse_functions(child, info, i++); + if (ret) + return ret; + } + + return 0; +} + +int s32_pinctrl_probe(struct platform_device *pdev, + struct s32_pinctrl_soc_info *info) +{ + struct s32_pinctrl *ipctl; + int ret; + struct pinctrl_desc *s32_pinctrl_desc; +#ifdef CONFIG_PM_SLEEP + struct s32_pinctrl_context *saved_context; +#endif + + if (!info || !info->pins || !info->npins) { + dev_err(&pdev->dev, "wrong pinctrl info\n"); + return -EINVAL; + } + + info->dev = &pdev->dev; + + /* Create state holders etc for this driver */ + ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL); + if (!ipctl) + return -ENOMEM; + + ipctl->info = info; + ipctl->dev = info->dev; + platform_set_drvdata(pdev, ipctl); + + INIT_LIST_HEAD(&ipctl->gpio_configs); + spin_lock_init(&ipctl->gpio_configs_lock); + + s32_pinctrl_desc = + devm_kmalloc(&pdev->dev, sizeof(*s32_pinctrl_desc), GFP_KERNEL); + if (!s32_pinctrl_desc) + return -ENOMEM; + + s32_pinctrl_desc->name = dev_name(&pdev->dev); + s32_pinctrl_desc->pins = info->pins; + s32_pinctrl_desc->npins = info->npins; + s32_pinctrl_desc->pctlops = &s32_pctrl_ops; + s32_pinctrl_desc->pmxops = &s32_pmx_ops; + s32_pinctrl_desc->confops = &s32_pinconf_ops; + s32_pinctrl_desc->owner = THIS_MODULE; + + ret = s32_pinctrl_probe_dt(pdev, ipctl); + if (ret) { + dev_err(&pdev->dev, "fail to probe dt properties\n"); + return ret; + } + + ipctl->pctl = devm_pinctrl_register(&pdev->dev, s32_pinctrl_desc, + ipctl); + if (IS_ERR(ipctl->pctl)) + return dev_err_probe(&pdev->dev, PTR_ERR(ipctl->pctl), + "could not register s32 pinctrl driver\n"); + +#ifdef CONFIG_PM_SLEEP + saved_context = &ipctl->saved_context; + saved_context->pads = + devm_kcalloc(&pdev->dev, info->npins, + sizeof(*saved_context->pads), + GFP_KERNEL); + if (!saved_context->pads) + return -ENOMEM; +#endif + + dev_info(&pdev->dev, "initialized s32 pinctrl driver\n"); + + return 0; +} |