diff options
Diffstat (limited to 'drivers/pinctrl/stm32/pinctrl-stm32.c')
| -rw-r--r-- | drivers/pinctrl/stm32/pinctrl-stm32.c | 1758 |
1 files changed, 1758 insertions, 0 deletions
diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c new file mode 100644 index 0000000000..346a31f31b --- /dev/null +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c @@ -0,0 +1,1758 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) Maxime Coquelin 2015 + * Copyright (C) STMicroelectronics 2017 + * Author: Maxime Coquelin <mcoquelin.stm32@gmail.com> + * + * Heavily based on Mediatek's pinctrl driver + */ +#include <linux/clk.h> +#include <linux/gpio/driver.h> +#include <linux/hwspinlock.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include <linux/seq_file.h> +#include <linux/slab.h> + +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/machine.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> + +#include "../core.h" +#include "../pinconf.h" +#include "../pinctrl-utils.h" +#include "pinctrl-stm32.h" + +#define STM32_GPIO_MODER 0x00 +#define STM32_GPIO_TYPER 0x04 +#define STM32_GPIO_SPEEDR 0x08 +#define STM32_GPIO_PUPDR 0x0c +#define STM32_GPIO_IDR 0x10 +#define STM32_GPIO_ODR 0x14 +#define STM32_GPIO_BSRR 0x18 +#define STM32_GPIO_LCKR 0x1c +#define STM32_GPIO_AFRL 0x20 +#define STM32_GPIO_AFRH 0x24 +#define STM32_GPIO_SECCFGR 0x30 + +/* custom bitfield to backup pin status */ +#define STM32_GPIO_BKP_MODE_SHIFT 0 +#define STM32_GPIO_BKP_MODE_MASK GENMASK(1, 0) +#define STM32_GPIO_BKP_ALT_SHIFT 2 +#define STM32_GPIO_BKP_ALT_MASK GENMASK(5, 2) +#define STM32_GPIO_BKP_SPEED_SHIFT 6 +#define STM32_GPIO_BKP_SPEED_MASK GENMASK(7, 6) +#define STM32_GPIO_BKP_PUPD_SHIFT 8 +#define STM32_GPIO_BKP_PUPD_MASK GENMASK(9, 8) +#define STM32_GPIO_BKP_TYPE 10 +#define STM32_GPIO_BKP_VAL 11 + +#define STM32_GPIO_PINS_PER_BANK 16 +#define STM32_GPIO_IRQ_LINE 16 + +#define SYSCFG_IRQMUX_MASK GENMASK(3, 0) + +#define gpio_range_to_bank(chip) \ + container_of(chip, struct stm32_gpio_bank, range) + +#define HWSPNLCK_TIMEOUT 1000 /* usec */ + +static const char * const stm32_gpio_functions[] = { + "gpio", "af0", "af1", + "af2", "af3", "af4", + "af5", "af6", "af7", + "af8", "af9", "af10", + "af11", "af12", "af13", + "af14", "af15", "analog", +}; + +struct stm32_pinctrl_group { + const char *name; + unsigned long config; + unsigned pin; +}; + +struct stm32_gpio_bank { + void __iomem *base; + struct clk *clk; + struct reset_control *rstc; + spinlock_t lock; + struct gpio_chip gpio_chip; + struct pinctrl_gpio_range range; + struct fwnode_handle *fwnode; + struct irq_domain *domain; + u32 bank_nr; + u32 bank_ioport_nr; + u32 pin_backup[STM32_GPIO_PINS_PER_BANK]; + u8 irq_type[STM32_GPIO_PINS_PER_BANK]; + bool secure_control; +}; + +struct stm32_pinctrl { + struct device *dev; + struct pinctrl_dev *pctl_dev; + struct pinctrl_desc pctl_desc; + struct stm32_pinctrl_group *groups; + unsigned ngroups; + const char **grp_names; + struct stm32_gpio_bank *banks; + unsigned nbanks; + const struct stm32_pinctrl_match_data *match_data; + struct irq_domain *domain; + struct regmap *regmap; + struct regmap_field *irqmux[STM32_GPIO_PINS_PER_BANK]; + struct hwspinlock *hwlock; + struct stm32_desc_pin *pins; + u32 npins; + u32 pkg; + u16 irqmux_map; + spinlock_t irqmux_lock; +}; + +static inline int stm32_gpio_pin(int gpio) +{ + return gpio % STM32_GPIO_PINS_PER_BANK; +} + +static inline u32 stm32_gpio_get_mode(u32 function) +{ + switch (function) { + case STM32_PIN_GPIO: + return 0; + case STM32_PIN_AF(0) ... STM32_PIN_AF(15): + return 2; + case STM32_PIN_ANALOG: + return 3; + } + + return 0; +} + +static inline u32 stm32_gpio_get_alt(u32 function) +{ + switch (function) { + case STM32_PIN_GPIO: + return 0; + case STM32_PIN_AF(0) ... STM32_PIN_AF(15): + return function - 1; + case STM32_PIN_ANALOG: + return 0; + } + + return 0; +} + +static void stm32_gpio_backup_value(struct stm32_gpio_bank *bank, + u32 offset, u32 value) +{ + bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_VAL); + bank->pin_backup[offset] |= value << STM32_GPIO_BKP_VAL; +} + +static void stm32_gpio_backup_mode(struct stm32_gpio_bank *bank, u32 offset, + u32 mode, u32 alt) +{ + bank->pin_backup[offset] &= ~(STM32_GPIO_BKP_MODE_MASK | + STM32_GPIO_BKP_ALT_MASK); + bank->pin_backup[offset] |= mode << STM32_GPIO_BKP_MODE_SHIFT; + bank->pin_backup[offset] |= alt << STM32_GPIO_BKP_ALT_SHIFT; +} + +static void stm32_gpio_backup_driving(struct stm32_gpio_bank *bank, u32 offset, + u32 drive) +{ + bank->pin_backup[offset] &= ~BIT(STM32_GPIO_BKP_TYPE); + bank->pin_backup[offset] |= drive << STM32_GPIO_BKP_TYPE; +} + +static void stm32_gpio_backup_speed(struct stm32_gpio_bank *bank, u32 offset, + u32 speed) +{ + bank->pin_backup[offset] &= ~STM32_GPIO_BKP_SPEED_MASK; + bank->pin_backup[offset] |= speed << STM32_GPIO_BKP_SPEED_SHIFT; +} + +static void stm32_gpio_backup_bias(struct stm32_gpio_bank *bank, u32 offset, + u32 bias) +{ + bank->pin_backup[offset] &= ~STM32_GPIO_BKP_PUPD_MASK; + bank->pin_backup[offset] |= bias << STM32_GPIO_BKP_PUPD_SHIFT; +} + +/* GPIO functions */ + +static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank, + unsigned offset, int value) +{ + stm32_gpio_backup_value(bank, offset, value); + + if (!value) + offset += STM32_GPIO_PINS_PER_BANK; + + writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR); +} + +static int stm32_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + struct pinctrl_gpio_range *range; + int pin = offset + (bank->bank_nr * STM32_GPIO_PINS_PER_BANK); + + range = pinctrl_find_gpio_range_from_pin_nolock(pctl->pctl_dev, pin); + if (!range) { + dev_err(pctl->dev, "pin %d not in range.\n", pin); + return -EINVAL; + } + + return pinctrl_gpio_request(chip->base + offset); +} + +static void stm32_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + pinctrl_gpio_free(chip->base + offset); +} + +static int stm32_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + + return !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset)); +} + +static void stm32_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + + __stm32_gpio_set(bank, offset, value); +} + +static int stm32_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_gpio_direction_input(chip->base + offset); +} + +static int stm32_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + + __stm32_gpio_set(bank, offset, value); + pinctrl_gpio_direction_output(chip->base + offset); + + return 0; +} + + +static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + struct irq_fwspec fwspec; + + fwspec.fwnode = bank->fwnode; + fwspec.param_count = 2; + fwspec.param[0] = offset; + fwspec.param[1] = IRQ_TYPE_NONE; + + return irq_create_fwspec_mapping(&fwspec); +} + +static int stm32_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + int pin = stm32_gpio_pin(offset); + int ret; + u32 mode, alt; + + stm32_pmx_get_mode(bank, pin, &mode, &alt); + if ((alt == 0) && (mode == 0)) + ret = GPIO_LINE_DIRECTION_IN; + else if ((alt == 0) && (mode == 1)) + ret = GPIO_LINE_DIRECTION_OUT; + else + ret = -EINVAL; + + return ret; +} + +static int stm32_gpio_init_valid_mask(struct gpio_chip *chip, + unsigned long *valid_mask, + unsigned int ngpios) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + unsigned int i; + u32 sec; + + /* All gpio are valid per default */ + bitmap_fill(valid_mask, ngpios); + + if (bank->secure_control) { + /* Tag secured pins as invalid */ + sec = readl_relaxed(bank->base + STM32_GPIO_SECCFGR); + + for (i = 0; i < ngpios; i++) { + if (sec & BIT(i)) { + clear_bit(i, valid_mask); + dev_dbg(pctl->dev, "No access to gpio %d - %d\n", bank->bank_nr, i); + } + } + } + + return 0; +} + +static const struct gpio_chip stm32_gpio_template = { + .request = stm32_gpio_request, + .free = stm32_gpio_free, + .get = stm32_gpio_get, + .set = stm32_gpio_set, + .direction_input = stm32_gpio_direction_input, + .direction_output = stm32_gpio_direction_output, + .to_irq = stm32_gpio_to_irq, + .get_direction = stm32_gpio_get_direction, + .set_config = gpiochip_generic_config, + .init_valid_mask = stm32_gpio_init_valid_mask, +}; + +static void stm32_gpio_irq_trigger(struct irq_data *d) +{ + struct stm32_gpio_bank *bank = d->domain->host_data; + int level; + + /* Do not access the GPIO if this is not LEVEL triggered IRQ. */ + if (!(bank->irq_type[d->hwirq] & IRQ_TYPE_LEVEL_MASK)) + return; + + /* If level interrupt type then retrig */ + level = stm32_gpio_get(&bank->gpio_chip, d->hwirq); + if ((level == 0 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_LOW) || + (level == 1 && bank->irq_type[d->hwirq] == IRQ_TYPE_LEVEL_HIGH)) + irq_chip_retrigger_hierarchy(d); +} + +static void stm32_gpio_irq_eoi(struct irq_data *d) +{ + irq_chip_eoi_parent(d); + stm32_gpio_irq_trigger(d); +}; + +static int stm32_gpio_set_type(struct irq_data *d, unsigned int type) +{ + struct stm32_gpio_bank *bank = d->domain->host_data; + u32 parent_type; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + case IRQ_TYPE_EDGE_FALLING: + case IRQ_TYPE_EDGE_BOTH: + parent_type = type; + break; + case IRQ_TYPE_LEVEL_HIGH: + parent_type = IRQ_TYPE_EDGE_RISING; + break; + case IRQ_TYPE_LEVEL_LOW: + parent_type = IRQ_TYPE_EDGE_FALLING; + break; + default: + return -EINVAL; + } + + bank->irq_type[d->hwirq] = type; + + return irq_chip_set_type_parent(d, parent_type); +}; + +static int stm32_gpio_irq_request_resources(struct irq_data *irq_data) +{ + struct stm32_gpio_bank *bank = irq_data->domain->host_data; + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + int ret; + + ret = stm32_gpio_direction_input(&bank->gpio_chip, irq_data->hwirq); + if (ret) + return ret; + + ret = gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq); + if (ret) { + dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n", + irq_data->hwirq); + return ret; + } + + return 0; +} + +static void stm32_gpio_irq_release_resources(struct irq_data *irq_data) +{ + struct stm32_gpio_bank *bank = irq_data->domain->host_data; + + gpiochip_unlock_as_irq(&bank->gpio_chip, irq_data->hwirq); +} + +static void stm32_gpio_irq_unmask(struct irq_data *d) +{ + irq_chip_unmask_parent(d); + stm32_gpio_irq_trigger(d); +} + +static struct irq_chip stm32_gpio_irq_chip = { + .name = "stm32gpio", + .irq_eoi = stm32_gpio_irq_eoi, + .irq_ack = irq_chip_ack_parent, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = stm32_gpio_irq_unmask, + .irq_set_type = stm32_gpio_set_type, + .irq_set_wake = irq_chip_set_wake_parent, + .irq_request_resources = stm32_gpio_irq_request_resources, + .irq_release_resources = stm32_gpio_irq_release_resources, +}; + +static int stm32_gpio_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + if ((fwspec->param_count != 2) || + (fwspec->param[0] >= STM32_GPIO_IRQ_LINE)) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1]; + return 0; +} + +static int stm32_gpio_domain_activate(struct irq_domain *d, + struct irq_data *irq_data, bool reserve) +{ + struct stm32_gpio_bank *bank = d->host_data; + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + int ret = 0; + + if (pctl->hwlock) { + ret = hwspin_lock_timeout_in_atomic(pctl->hwlock, + HWSPNLCK_TIMEOUT); + if (ret) { + dev_err(pctl->dev, "Can't get hwspinlock\n"); + return ret; + } + } + + regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->bank_ioport_nr); + + if (pctl->hwlock) + hwspin_unlock_in_atomic(pctl->hwlock); + + return ret; +} + +static int stm32_gpio_domain_alloc(struct irq_domain *d, + unsigned int virq, + unsigned int nr_irqs, void *data) +{ + struct stm32_gpio_bank *bank = d->host_data; + struct irq_fwspec *fwspec = data; + struct irq_fwspec parent_fwspec; + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + irq_hw_number_t hwirq = fwspec->param[0]; + unsigned long flags; + int ret = 0; + + /* + * Check first that the IRQ MUX of that line is free. + * gpio irq mux is shared between several banks, protect with a lock + */ + spin_lock_irqsave(&pctl->irqmux_lock, flags); + + if (pctl->irqmux_map & BIT(hwirq)) { + dev_err(pctl->dev, "irq line %ld already requested.\n", hwirq); + ret = -EBUSY; + } else { + pctl->irqmux_map |= BIT(hwirq); + } + + spin_unlock_irqrestore(&pctl->irqmux_lock, flags); + if (ret) + return ret; + + parent_fwspec.fwnode = d->parent->fwnode; + parent_fwspec.param_count = 2; + parent_fwspec.param[0] = fwspec->param[0]; + parent_fwspec.param[1] = fwspec->param[1]; + + irq_domain_set_hwirq_and_chip(d, virq, hwirq, &stm32_gpio_irq_chip, + bank); + + return irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &parent_fwspec); +} + +static void stm32_gpio_domain_free(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs) +{ + struct stm32_gpio_bank *bank = d->host_data; + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + struct irq_data *irq_data = irq_domain_get_irq_data(d, virq); + unsigned long flags, hwirq = irq_data->hwirq; + + irq_domain_free_irqs_common(d, virq, nr_irqs); + + spin_lock_irqsave(&pctl->irqmux_lock, flags); + pctl->irqmux_map &= ~BIT(hwirq); + spin_unlock_irqrestore(&pctl->irqmux_lock, flags); +} + +static const struct irq_domain_ops stm32_gpio_domain_ops = { + .translate = stm32_gpio_domain_translate, + .alloc = stm32_gpio_domain_alloc, + .free = stm32_gpio_domain_free, + .activate = stm32_gpio_domain_activate, +}; + +/* Pinctrl functions */ +static struct stm32_pinctrl_group * +stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin) +{ + int i; + + for (i = 0; i < pctl->ngroups; i++) { + struct stm32_pinctrl_group *grp = pctl->groups + i; + + if (grp->pin == pin) + return grp; + } + + return NULL; +} + +static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl, + u32 pin_num, u32 fnum) +{ + int i, k; + + for (i = 0; i < pctl->npins; i++) { + const struct stm32_desc_pin *pin = pctl->pins + i; + const struct stm32_desc_function *func = pin->functions; + + if (pin->pin.number != pin_num) + continue; + + for (k = 0; k < STM32_CONFIG_NUM; k++) { + if (func->num == fnum) + return true; + func++; + } + + break; + } + + dev_err(pctl->dev, "invalid function %d on pin %d .\n", fnum, pin_num); + + return false; +} + +static int stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl *pctl, + u32 pin, u32 fnum, struct stm32_pinctrl_group *grp, + struct pinctrl_map **map, unsigned *reserved_maps, + unsigned *num_maps) +{ + if (*num_maps == *reserved_maps) + return -ENOSPC; + + (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP; + (*map)[*num_maps].data.mux.group = grp->name; + + if (!stm32_pctrl_is_function_valid(pctl, pin, fnum)) + return -EINVAL; + + (*map)[*num_maps].data.mux.function = stm32_gpio_functions[fnum]; + (*num_maps)++; + + return 0; +} + +static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev, + struct device_node *node, + struct pinctrl_map **map, + unsigned *reserved_maps, + unsigned *num_maps) +{ + struct stm32_pinctrl *pctl; + struct stm32_pinctrl_group *grp; + struct property *pins; + u32 pinfunc, pin, func; + unsigned long *configs; + unsigned int num_configs; + bool has_config = 0; + unsigned reserve = 0; + int num_pins, num_funcs, maps_per_pin, i, err = 0; + + pctl = pinctrl_dev_get_drvdata(pctldev); + + pins = of_find_property(node, "pinmux", NULL); + if (!pins) { + dev_err(pctl->dev, "missing pins property in node %pOFn .\n", + node); + return -EINVAL; + } + + err = pinconf_generic_parse_dt_config(node, pctldev, &configs, + &num_configs); + if (err) + return err; + + if (num_configs) + has_config = 1; + + num_pins = pins->length / sizeof(u32); + num_funcs = num_pins; + maps_per_pin = 0; + if (num_funcs) + maps_per_pin++; + if (has_config && num_pins >= 1) + maps_per_pin++; + + if (!num_pins || !maps_per_pin) { + err = -EINVAL; + goto exit; + } + + reserve = num_pins * maps_per_pin; + + err = pinctrl_utils_reserve_map(pctldev, map, + reserved_maps, num_maps, reserve); + if (err) + goto exit; + + for (i = 0; i < num_pins; i++) { + err = of_property_read_u32_index(node, "pinmux", + i, &pinfunc); + if (err) + goto exit; + + pin = STM32_GET_PIN_NO(pinfunc); + func = STM32_GET_PIN_FUNC(pinfunc); + + if (!stm32_pctrl_is_function_valid(pctl, pin, func)) { + err = -EINVAL; + goto exit; + } + + grp = stm32_pctrl_find_group_by_pin(pctl, pin); + if (!grp) { + dev_err(pctl->dev, "unable to match pin %d to group\n", + pin); + err = -EINVAL; + goto exit; + } + + err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map, + reserved_maps, num_maps); + if (err) + goto exit; + + if (has_config) { + err = pinctrl_utils_add_map_configs(pctldev, map, + reserved_maps, num_maps, grp->name, + configs, num_configs, + PIN_MAP_TYPE_CONFIGS_GROUP); + if (err) + goto exit; + } + } + +exit: + kfree(configs); + return err; +} + +static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np_config, + struct pinctrl_map **map, unsigned *num_maps) +{ + struct device_node *np; + unsigned reserved_maps; + int ret; + + *map = NULL; + *num_maps = 0; + reserved_maps = 0; + + for_each_child_of_node(np_config, np) { + ret = stm32_pctrl_dt_subnode_to_map(pctldev, np, map, + &reserved_maps, num_maps); + if (ret < 0) { + pinctrl_utils_free_map(pctldev, *map, *num_maps); + of_node_put(np); + return ret; + } + } + + return 0; +} + +static int stm32_pctrl_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + return pctl->ngroups; +} + +static const char *stm32_pctrl_get_group_name(struct pinctrl_dev *pctldev, + unsigned group) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + return pctl->groups[group].name; +} + +static int stm32_pctrl_get_group_pins(struct pinctrl_dev *pctldev, + unsigned group, + const unsigned **pins, + unsigned *num_pins) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + *pins = (unsigned *)&pctl->groups[group].pin; + *num_pins = 1; + + return 0; +} + +static const struct pinctrl_ops stm32_pctrl_ops = { + .dt_node_to_map = stm32_pctrl_dt_node_to_map, + .dt_free_map = pinctrl_utils_free_map, + .get_groups_count = stm32_pctrl_get_groups_count, + .get_group_name = stm32_pctrl_get_group_name, + .get_group_pins = stm32_pctrl_get_group_pins, +}; + + +/* Pinmux functions */ + +static int stm32_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev) +{ + return ARRAY_SIZE(stm32_gpio_functions); +} + +static const char *stm32_pmx_get_func_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + return stm32_gpio_functions[selector]; +} + +static int stm32_pmx_get_func_groups(struct pinctrl_dev *pctldev, + unsigned function, + const char * const **groups, + unsigned * const num_groups) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + *groups = pctl->grp_names; + *num_groups = pctl->ngroups; + + return 0; +} + +static int stm32_pmx_set_mode(struct stm32_gpio_bank *bank, + int pin, u32 mode, u32 alt) +{ + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + u32 val; + int alt_shift = (pin % 8) * 4; + int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4; + unsigned long flags; + int err = 0; + + spin_lock_irqsave(&bank->lock, flags); + + if (pctl->hwlock) { + err = hwspin_lock_timeout_in_atomic(pctl->hwlock, + HWSPNLCK_TIMEOUT); + if (err) { + dev_err(pctl->dev, "Can't get hwspinlock\n"); + goto unlock; + } + } + + val = readl_relaxed(bank->base + alt_offset); + val &= ~GENMASK(alt_shift + 3, alt_shift); + val |= (alt << alt_shift); + writel_relaxed(val, bank->base + alt_offset); + + val = readl_relaxed(bank->base + STM32_GPIO_MODER); + val &= ~GENMASK(pin * 2 + 1, pin * 2); + val |= mode << (pin * 2); + writel_relaxed(val, bank->base + STM32_GPIO_MODER); + + if (pctl->hwlock) + hwspin_unlock_in_atomic(pctl->hwlock); + + stm32_gpio_backup_mode(bank, pin, mode, alt); + +unlock: + spin_unlock_irqrestore(&bank->lock, flags); + + return err; +} + +void stm32_pmx_get_mode(struct stm32_gpio_bank *bank, int pin, u32 *mode, + u32 *alt) +{ + u32 val; + int alt_shift = (pin % 8) * 4; + int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4; + unsigned long flags; + + spin_lock_irqsave(&bank->lock, flags); + + val = readl_relaxed(bank->base + alt_offset); + val &= GENMASK(alt_shift + 3, alt_shift); + *alt = val >> alt_shift; + + val = readl_relaxed(bank->base + STM32_GPIO_MODER); + val &= GENMASK(pin * 2 + 1, pin * 2); + *mode = val >> (pin * 2); + + spin_unlock_irqrestore(&bank->lock, flags); +} + +static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev, + unsigned function, + unsigned group) +{ + bool ret; + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct stm32_pinctrl_group *g = pctl->groups + group; + struct pinctrl_gpio_range *range; + struct stm32_gpio_bank *bank; + u32 mode, alt; + int pin; + + ret = stm32_pctrl_is_function_valid(pctl, g->pin, function); + if (!ret) + return -EINVAL; + + range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin); + if (!range) { + dev_err(pctl->dev, "No gpio range defined.\n"); + return -EINVAL; + } + + bank = gpiochip_get_data(range->gc); + pin = stm32_gpio_pin(g->pin); + + mode = stm32_gpio_get_mode(function); + alt = stm32_gpio_get_alt(function); + + return stm32_pmx_set_mode(bank, pin, mode, alt); +} + +static int stm32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, unsigned gpio, + bool input) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(range->gc); + int pin = stm32_gpio_pin(gpio); + + return stm32_pmx_set_mode(bank, pin, !input, 0); +} + +static int stm32_pmx_request(struct pinctrl_dev *pctldev, unsigned int gpio) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct pinctrl_gpio_range *range; + + range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, gpio); + if (!range) { + dev_err(pctl->dev, "No gpio range defined.\n"); + return -EINVAL; + } + + if (!gpiochip_line_is_valid(range->gc, stm32_gpio_pin(gpio))) { + dev_warn(pctl->dev, "Can't access gpio %d\n", gpio); + return -EACCES; + } + + return 0; +} + +static const struct pinmux_ops stm32_pmx_ops = { + .get_functions_count = stm32_pmx_get_funcs_cnt, + .get_function_name = stm32_pmx_get_func_name, + .get_function_groups = stm32_pmx_get_func_groups, + .set_mux = stm32_pmx_set_mux, + .gpio_set_direction = stm32_pmx_gpio_set_direction, + .request = stm32_pmx_request, + .strict = true, +}; + +/* Pinconf functions */ + +static int stm32_pconf_set_driving(struct stm32_gpio_bank *bank, + unsigned offset, u32 drive) +{ + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + unsigned long flags; + u32 val; + int err = 0; + + spin_lock_irqsave(&bank->lock, flags); + + if (pctl->hwlock) { + err = hwspin_lock_timeout_in_atomic(pctl->hwlock, + HWSPNLCK_TIMEOUT); + if (err) { + dev_err(pctl->dev, "Can't get hwspinlock\n"); + goto unlock; + } + } + + val = readl_relaxed(bank->base + STM32_GPIO_TYPER); + val &= ~BIT(offset); + val |= drive << offset; + writel_relaxed(val, bank->base + STM32_GPIO_TYPER); + + if (pctl->hwlock) + hwspin_unlock_in_atomic(pctl->hwlock); + + stm32_gpio_backup_driving(bank, offset, drive); + +unlock: + spin_unlock_irqrestore(&bank->lock, flags); + + return err; +} + +static u32 stm32_pconf_get_driving(struct stm32_gpio_bank *bank, + unsigned int offset) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&bank->lock, flags); + + val = readl_relaxed(bank->base + STM32_GPIO_TYPER); + val &= BIT(offset); + + spin_unlock_irqrestore(&bank->lock, flags); + + return (val >> offset); +} + +static int stm32_pconf_set_speed(struct stm32_gpio_bank *bank, + unsigned offset, u32 speed) +{ + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + unsigned long flags; + u32 val; + int err = 0; + + spin_lock_irqsave(&bank->lock, flags); + + if (pctl->hwlock) { + err = hwspin_lock_timeout_in_atomic(pctl->hwlock, + HWSPNLCK_TIMEOUT); + if (err) { + dev_err(pctl->dev, "Can't get hwspinlock\n"); + goto unlock; + } + } + + val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR); + val &= ~GENMASK(offset * 2 + 1, offset * 2); + val |= speed << (offset * 2); + writel_relaxed(val, bank->base + STM32_GPIO_SPEEDR); + + if (pctl->hwlock) + hwspin_unlock_in_atomic(pctl->hwlock); + + stm32_gpio_backup_speed(bank, offset, speed); + +unlock: + spin_unlock_irqrestore(&bank->lock, flags); + + return err; +} + +static u32 stm32_pconf_get_speed(struct stm32_gpio_bank *bank, + unsigned int offset) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&bank->lock, flags); + + val = readl_relaxed(bank->base + STM32_GPIO_SPEEDR); + val &= GENMASK(offset * 2 + 1, offset * 2); + + spin_unlock_irqrestore(&bank->lock, flags); + + return (val >> (offset * 2)); +} + +static int stm32_pconf_set_bias(struct stm32_gpio_bank *bank, + unsigned offset, u32 bias) +{ + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + unsigned long flags; + u32 val; + int err = 0; + + spin_lock_irqsave(&bank->lock, flags); + + if (pctl->hwlock) { + err = hwspin_lock_timeout_in_atomic(pctl->hwlock, + HWSPNLCK_TIMEOUT); + if (err) { + dev_err(pctl->dev, "Can't get hwspinlock\n"); + goto unlock; + } + } + + val = readl_relaxed(bank->base + STM32_GPIO_PUPDR); + val &= ~GENMASK(offset * 2 + 1, offset * 2); + val |= bias << (offset * 2); + writel_relaxed(val, bank->base + STM32_GPIO_PUPDR); + + if (pctl->hwlock) + hwspin_unlock_in_atomic(pctl->hwlock); + + stm32_gpio_backup_bias(bank, offset, bias); + +unlock: + spin_unlock_irqrestore(&bank->lock, flags); + + return err; +} + +static u32 stm32_pconf_get_bias(struct stm32_gpio_bank *bank, + unsigned int offset) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&bank->lock, flags); + + val = readl_relaxed(bank->base + STM32_GPIO_PUPDR); + val &= GENMASK(offset * 2 + 1, offset * 2); + + spin_unlock_irqrestore(&bank->lock, flags); + + return (val >> (offset * 2)); +} + +static bool stm32_pconf_get(struct stm32_gpio_bank *bank, + unsigned int offset, bool dir) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&bank->lock, flags); + + if (dir) + val = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & + BIT(offset)); + else + val = !!(readl_relaxed(bank->base + STM32_GPIO_ODR) & + BIT(offset)); + + spin_unlock_irqrestore(&bank->lock, flags); + + return val; +} + +static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev, + unsigned int pin, enum pin_config_param param, + enum pin_config_param arg) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct pinctrl_gpio_range *range; + struct stm32_gpio_bank *bank; + int offset, ret = 0; + + range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); + if (!range) { + dev_err(pctl->dev, "No gpio range defined.\n"); + return -EINVAL; + } + + bank = gpiochip_get_data(range->gc); + offset = stm32_gpio_pin(pin); + + if (!gpiochip_line_is_valid(range->gc, offset)) { + dev_warn(pctl->dev, "Can't access gpio %d\n", pin); + return -EACCES; + } + + switch (param) { + case PIN_CONFIG_DRIVE_PUSH_PULL: + ret = stm32_pconf_set_driving(bank, offset, 0); + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + ret = stm32_pconf_set_driving(bank, offset, 1); + break; + case PIN_CONFIG_SLEW_RATE: + ret = stm32_pconf_set_speed(bank, offset, arg); + break; + case PIN_CONFIG_BIAS_DISABLE: + ret = stm32_pconf_set_bias(bank, offset, 0); + break; + case PIN_CONFIG_BIAS_PULL_UP: + ret = stm32_pconf_set_bias(bank, offset, 1); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + ret = stm32_pconf_set_bias(bank, offset, 2); + break; + case PIN_CONFIG_OUTPUT: + __stm32_gpio_set(bank, offset, arg); + ret = stm32_pmx_gpio_set_direction(pctldev, range, pin, false); + break; + default: + ret = -ENOTSUPP; + } + + return ret; +} + +static int stm32_pconf_group_get(struct pinctrl_dev *pctldev, + unsigned group, + unsigned long *config) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + *config = pctl->groups[group].config; + + return 0; +} + +static int stm32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group, + unsigned long *configs, unsigned num_configs) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct stm32_pinctrl_group *g = &pctl->groups[group]; + int i, ret; + + for (i = 0; i < num_configs; i++) { + mutex_lock(&pctldev->mutex); + ret = stm32_pconf_parse_conf(pctldev, g->pin, + pinconf_to_config_param(configs[i]), + pinconf_to_config_argument(configs[i])); + mutex_unlock(&pctldev->mutex); + if (ret < 0) + return ret; + + g->config = configs[i]; + } + + return 0; +} + +static int stm32_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin, + unsigned long *configs, unsigned int num_configs) +{ + int i, ret; + + for (i = 0; i < num_configs; i++) { + ret = stm32_pconf_parse_conf(pctldev, pin, + pinconf_to_config_param(configs[i]), + pinconf_to_config_argument(configs[i])); + if (ret < 0) + return ret; + } + + return 0; +} + +static struct stm32_desc_pin * +stm32_pconf_get_pin_desc_by_pin_number(struct stm32_pinctrl *pctl, + unsigned int pin_number) +{ + struct stm32_desc_pin *pins = pctl->pins; + int i; + + for (i = 0; i < pctl->npins; i++) { + if (pins->pin.number == pin_number) + return pins; + pins++; + } + return NULL; +} + +static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, + unsigned int pin) +{ + struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + const struct stm32_desc_pin *pin_desc; + struct pinctrl_gpio_range *range; + struct stm32_gpio_bank *bank; + int offset; + u32 mode, alt, drive, speed, bias; + static const char * const modes[] = { + "input", "output", "alternate", "analog" }; + static const char * const speeds[] = { + "low", "medium", "high", "very high" }; + static const char * const biasing[] = { + "floating", "pull up", "pull down", "" }; + bool val; + + range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); + if (!range) + return; + + bank = gpiochip_get_data(range->gc); + offset = stm32_gpio_pin(pin); + + if (!gpiochip_line_is_valid(range->gc, offset)) { + seq_puts(s, "NO ACCESS"); + return; + } + + stm32_pmx_get_mode(bank, offset, &mode, &alt); + bias = stm32_pconf_get_bias(bank, offset); + + seq_printf(s, "%s ", modes[mode]); + + switch (mode) { + /* input */ + case 0: + val = stm32_pconf_get(bank, offset, true); + seq_printf(s, "- %s - %s", + val ? "high" : "low", + biasing[bias]); + break; + + /* output */ + case 1: + drive = stm32_pconf_get_driving(bank, offset); + speed = stm32_pconf_get_speed(bank, offset); + val = stm32_pconf_get(bank, offset, false); + seq_printf(s, "- %s - %s - %s - %s %s", + val ? "high" : "low", + drive ? "open drain" : "push pull", + biasing[bias], + speeds[speed], "speed"); + break; + + /* alternate */ + case 2: + drive = stm32_pconf_get_driving(bank, offset); + speed = stm32_pconf_get_speed(bank, offset); + pin_desc = stm32_pconf_get_pin_desc_by_pin_number(pctl, pin); + if (!pin_desc) + return; + + seq_printf(s, "%d (%s) - %s - %s - %s %s", alt, + pin_desc->functions[alt + 1].name, + drive ? "open drain" : "push pull", + biasing[bias], + speeds[speed], "speed"); + break; + + /* analog */ + case 3: + break; + } +} + +static const struct pinconf_ops stm32_pconf_ops = { + .pin_config_group_get = stm32_pconf_group_get, + .pin_config_group_set = stm32_pconf_group_set, + .pin_config_set = stm32_pconf_set, + .pin_config_dbg_show = stm32_pconf_dbg_show, +}; + +static struct stm32_desc_pin *stm32_pctrl_get_desc_pin_from_gpio(struct stm32_pinctrl *pctl, + struct stm32_gpio_bank *bank, + unsigned int offset) +{ + unsigned int stm32_pin_nb = bank->bank_nr * STM32_GPIO_PINS_PER_BANK + offset; + struct stm32_desc_pin *pin_desc; + int i; + + /* With few exceptions (e.g. bank 'Z'), pin number matches with pin index in array */ + if (stm32_pin_nb < pctl->npins) { + pin_desc = pctl->pins + stm32_pin_nb; + if (pin_desc->pin.number == stm32_pin_nb) + return pin_desc; + } + + /* Otherwise, loop all array to find the pin with the right number */ + for (i = 0; i < pctl->npins; i++) { + pin_desc = pctl->pins + i; + if (pin_desc->pin.number == stm32_pin_nb) + return pin_desc; + } + return NULL; +} + +static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode_handle *fwnode) +{ + struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks]; + int bank_ioport_nr; + struct pinctrl_gpio_range *range = &bank->range; + struct fwnode_reference_args args; + struct device *dev = pctl->dev; + struct resource res; + int npins = STM32_GPIO_PINS_PER_BANK; + int bank_nr, err, i = 0; + struct stm32_desc_pin *stm32_pin; + char **names; + + if (!IS_ERR(bank->rstc)) + reset_control_deassert(bank->rstc); + + if (of_address_to_resource(to_of_node(fwnode), 0, &res)) + return -ENODEV; + + bank->base = devm_ioremap_resource(dev, &res); + if (IS_ERR(bank->base)) + return PTR_ERR(bank->base); + + err = clk_prepare_enable(bank->clk); + if (err) { + dev_err(dev, "failed to prepare_enable clk (%d)\n", err); + return err; + } + + bank->gpio_chip = stm32_gpio_template; + + fwnode_property_read_string(fwnode, "st,bank-name", &bank->gpio_chip.label); + + if (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, i, &args)) { + bank_nr = args.args[1] / STM32_GPIO_PINS_PER_BANK; + bank->gpio_chip.base = args.args[1]; + + /* get the last defined gpio line (offset + nb of pins) */ + npins = args.args[0] + args.args[2]; + while (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, ++i, &args)) + npins = max(npins, (int)(args.args[0] + args.args[2])); + } else { + bank_nr = pctl->nbanks; + bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK; + range->name = bank->gpio_chip.label; + range->id = bank_nr; + range->pin_base = range->id * STM32_GPIO_PINS_PER_BANK; + range->base = range->id * STM32_GPIO_PINS_PER_BANK; + range->npins = npins; + range->gc = &bank->gpio_chip; + pinctrl_add_gpio_range(pctl->pctl_dev, + &pctl->banks[bank_nr].range); + } + + if (fwnode_property_read_u32(fwnode, "st,bank-ioport", &bank_ioport_nr)) + bank_ioport_nr = bank_nr; + + bank->gpio_chip.base = -1; + + bank->gpio_chip.ngpio = npins; + bank->gpio_chip.fwnode = fwnode; + bank->gpio_chip.parent = dev; + bank->bank_nr = bank_nr; + bank->bank_ioport_nr = bank_ioport_nr; + bank->secure_control = pctl->match_data->secure_control; + spin_lock_init(&bank->lock); + + if (pctl->domain) { + /* create irq hierarchical domain */ + bank->fwnode = fwnode; + + bank->domain = irq_domain_create_hierarchy(pctl->domain, 0, STM32_GPIO_IRQ_LINE, + bank->fwnode, &stm32_gpio_domain_ops, + bank); + + if (!bank->domain) { + err = -ENODEV; + goto err_clk; + } + } + + names = devm_kcalloc(dev, npins, sizeof(char *), GFP_KERNEL); + if (!names) { + err = -ENOMEM; + goto err_clk; + } + + for (i = 0; i < npins; i++) { + stm32_pin = stm32_pctrl_get_desc_pin_from_gpio(pctl, bank, i); + if (stm32_pin && stm32_pin->pin.name) + names[i] = devm_kasprintf(dev, GFP_KERNEL, "%s", stm32_pin->pin.name); + else + names[i] = NULL; + } + + bank->gpio_chip.names = (const char * const *)names; + + err = gpiochip_add_data(&bank->gpio_chip, bank); + if (err) { + dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr); + goto err_clk; + } + + dev_info(dev, "%s bank added\n", bank->gpio_chip.label); + return 0; + +err_clk: + clk_disable_unprepare(bank->clk); + return err; +} + +static struct irq_domain *stm32_pctrl_get_irq_domain(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct device_node *parent; + struct irq_domain *domain; + + if (!of_property_present(np, "interrupt-parent")) + return NULL; + + parent = of_irq_find_parent(np); + if (!parent) + return ERR_PTR(-ENXIO); + + domain = irq_find_host(parent); + of_node_put(parent); + if (!domain) + /* domain not registered yet */ + return ERR_PTR(-EPROBE_DEFER); + + return domain; +} + +static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev, + struct stm32_pinctrl *pctl) +{ + struct device_node *np = pdev->dev.of_node; + struct device *dev = &pdev->dev; + struct regmap *rm; + int offset, ret, i; + int mask, mask_width; + + pctl->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (IS_ERR(pctl->regmap)) + return PTR_ERR(pctl->regmap); + + rm = pctl->regmap; + + ret = of_property_read_u32_index(np, "st,syscfg", 1, &offset); + if (ret) + return ret; + + ret = of_property_read_u32_index(np, "st,syscfg", 2, &mask); + if (ret) + mask = SYSCFG_IRQMUX_MASK; + + mask_width = fls(mask); + + for (i = 0; i < STM32_GPIO_PINS_PER_BANK; i++) { + struct reg_field mux; + + mux.reg = offset + (i / 4) * 4; + mux.lsb = (i % 4) * mask_width; + mux.msb = mux.lsb + mask_width - 1; + + dev_dbg(dev, "irqmux%d: reg:%#x, lsb:%d, msb:%d\n", + i, mux.reg, mux.lsb, mux.msb); + + pctl->irqmux[i] = devm_regmap_field_alloc(dev, rm, mux); + if (IS_ERR(pctl->irqmux[i])) + return PTR_ERR(pctl->irqmux[i]); + } + + return 0; +} + +static int stm32_pctrl_build_state(struct platform_device *pdev) +{ + struct stm32_pinctrl *pctl = platform_get_drvdata(pdev); + int i; + + pctl->ngroups = pctl->npins; + + /* Allocate groups */ + pctl->groups = devm_kcalloc(&pdev->dev, pctl->ngroups, + sizeof(*pctl->groups), GFP_KERNEL); + if (!pctl->groups) + return -ENOMEM; + + /* We assume that one pin is one group, use pin name as group name. */ + pctl->grp_names = devm_kcalloc(&pdev->dev, pctl->ngroups, + sizeof(*pctl->grp_names), GFP_KERNEL); + if (!pctl->grp_names) + return -ENOMEM; + + for (i = 0; i < pctl->npins; i++) { + const struct stm32_desc_pin *pin = pctl->pins + i; + struct stm32_pinctrl_group *group = pctl->groups + i; + + group->name = pin->pin.name; + group->pin = pin->pin.number; + pctl->grp_names[i] = pin->pin.name; + } + + return 0; +} + +static int stm32_pctrl_create_pins_tab(struct stm32_pinctrl *pctl, + struct stm32_desc_pin *pins) +{ + const struct stm32_desc_pin *p; + int i, nb_pins_available = 0; + + for (i = 0; i < pctl->match_data->npins; i++) { + p = pctl->match_data->pins + i; + if (pctl->pkg && !(pctl->pkg & p->pkg)) + continue; + pins->pin = p->pin; + memcpy((struct stm32_desc_pin *)pins->functions, p->functions, + STM32_CONFIG_NUM * sizeof(struct stm32_desc_function)); + pins++; + nb_pins_available++; + } + + pctl->npins = nb_pins_available; + + return 0; +} + +int stm32_pctl_probe(struct platform_device *pdev) +{ + const struct stm32_pinctrl_match_data *match_data; + struct fwnode_handle *child; + struct device *dev = &pdev->dev; + struct stm32_pinctrl *pctl; + struct pinctrl_pin_desc *pins; + int i, ret, hwlock_id; + unsigned int banks; + + match_data = device_get_match_data(dev); + if (!match_data) + return -EINVAL; + + pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL); + if (!pctl) + return -ENOMEM; + + platform_set_drvdata(pdev, pctl); + + /* check for IRQ controller (may require deferred probe) */ + pctl->domain = stm32_pctrl_get_irq_domain(pdev); + if (IS_ERR(pctl->domain)) + return PTR_ERR(pctl->domain); + if (!pctl->domain) + dev_warn(dev, "pinctrl without interrupt support\n"); + + /* hwspinlock is optional */ + hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0); + if (hwlock_id < 0) { + if (hwlock_id == -EPROBE_DEFER) + return hwlock_id; + } else { + pctl->hwlock = hwspin_lock_request_specific(hwlock_id); + } + + spin_lock_init(&pctl->irqmux_lock); + + pctl->dev = dev; + pctl->match_data = match_data; + + /* get optional package information */ + if (!device_property_read_u32(dev, "st,package", &pctl->pkg)) + dev_dbg(pctl->dev, "package detected: %x\n", pctl->pkg); + + pctl->pins = devm_kcalloc(pctl->dev, pctl->match_data->npins, + sizeof(*pctl->pins), GFP_KERNEL); + if (!pctl->pins) + return -ENOMEM; + + ret = stm32_pctrl_create_pins_tab(pctl, pctl->pins); + if (ret) + return ret; + + ret = stm32_pctrl_build_state(pdev); + if (ret) { + dev_err(dev, "build state failed: %d\n", ret); + return -EINVAL; + } + + if (pctl->domain) { + ret = stm32_pctrl_dt_setup_irq(pdev, pctl); + if (ret) + return ret; + } + + pins = devm_kcalloc(&pdev->dev, pctl->npins, sizeof(*pins), + GFP_KERNEL); + if (!pins) + return -ENOMEM; + + for (i = 0; i < pctl->npins; i++) + pins[i] = pctl->pins[i].pin; + + pctl->pctl_desc.name = dev_name(&pdev->dev); + pctl->pctl_desc.owner = THIS_MODULE; + pctl->pctl_desc.pins = pins; + pctl->pctl_desc.npins = pctl->npins; + pctl->pctl_desc.link_consumers = true; + pctl->pctl_desc.confops = &stm32_pconf_ops; + pctl->pctl_desc.pctlops = &stm32_pctrl_ops; + pctl->pctl_desc.pmxops = &stm32_pmx_ops; + pctl->dev = &pdev->dev; + + pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->pctl_desc, + pctl); + + if (IS_ERR(pctl->pctl_dev)) { + dev_err(&pdev->dev, "Failed pinctrl registration\n"); + return PTR_ERR(pctl->pctl_dev); + } + + banks = gpiochip_node_count(dev); + if (!banks) { + dev_err(dev, "at least one GPIO bank is required\n"); + return -EINVAL; + } + pctl->banks = devm_kcalloc(dev, banks, sizeof(*pctl->banks), + GFP_KERNEL); + if (!pctl->banks) + return -ENOMEM; + + i = 0; + for_each_gpiochip_node(dev, child) { + struct stm32_gpio_bank *bank = &pctl->banks[i]; + struct device_node *np = to_of_node(child); + + bank->rstc = of_reset_control_get_exclusive(np, NULL); + if (PTR_ERR(bank->rstc) == -EPROBE_DEFER) { + fwnode_handle_put(child); + return -EPROBE_DEFER; + } + + bank->clk = of_clk_get_by_name(np, NULL); + if (IS_ERR(bank->clk)) { + fwnode_handle_put(child); + return dev_err_probe(dev, PTR_ERR(bank->clk), + "failed to get clk\n"); + } + i++; + } + + for_each_gpiochip_node(dev, child) { + ret = stm32_gpiolib_register_bank(pctl, child); + if (ret) { + fwnode_handle_put(child); + + for (i = 0; i < pctl->nbanks; i++) + clk_disable_unprepare(pctl->banks[i].clk); + + return ret; + } + + pctl->nbanks++; + } + + dev_info(dev, "Pinctrl STM32 initialized\n"); + + return 0; +} + +static int __maybe_unused stm32_pinctrl_restore_gpio_regs( + struct stm32_pinctrl *pctl, u32 pin) +{ + const struct pin_desc *desc = pin_desc_get(pctl->pctl_dev, pin); + u32 val, alt, mode, offset = stm32_gpio_pin(pin); + struct pinctrl_gpio_range *range; + struct stm32_gpio_bank *bank; + bool pin_is_irq; + int ret; + + range = pinctrl_find_gpio_range_from_pin(pctl->pctl_dev, pin); + if (!range) + return 0; + + if (!gpiochip_line_is_valid(range->gc, offset)) + return 0; + + pin_is_irq = gpiochip_line_is_irq(range->gc, offset); + + if (!desc || (!pin_is_irq && !desc->gpio_owner)) + return 0; + + bank = gpiochip_get_data(range->gc); + + alt = bank->pin_backup[offset] & STM32_GPIO_BKP_ALT_MASK; + alt >>= STM32_GPIO_BKP_ALT_SHIFT; + mode = bank->pin_backup[offset] & STM32_GPIO_BKP_MODE_MASK; + mode >>= STM32_GPIO_BKP_MODE_SHIFT; + + ret = stm32_pmx_set_mode(bank, offset, mode, alt); + if (ret) + return ret; + + if (mode == 1) { + val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_VAL); + val = val >> STM32_GPIO_BKP_VAL; + __stm32_gpio_set(bank, offset, val); + } + + val = bank->pin_backup[offset] & BIT(STM32_GPIO_BKP_TYPE); + val >>= STM32_GPIO_BKP_TYPE; + ret = stm32_pconf_set_driving(bank, offset, val); + if (ret) + return ret; + + val = bank->pin_backup[offset] & STM32_GPIO_BKP_SPEED_MASK; + val >>= STM32_GPIO_BKP_SPEED_SHIFT; + ret = stm32_pconf_set_speed(bank, offset, val); + if (ret) + return ret; + + val = bank->pin_backup[offset] & STM32_GPIO_BKP_PUPD_MASK; + val >>= STM32_GPIO_BKP_PUPD_SHIFT; + ret = stm32_pconf_set_bias(bank, offset, val); + if (ret) + return ret; + + if (pin_is_irq) + regmap_field_write(pctl->irqmux[offset], bank->bank_ioport_nr); + + return 0; +} + +int __maybe_unused stm32_pinctrl_suspend(struct device *dev) +{ + struct stm32_pinctrl *pctl = dev_get_drvdata(dev); + int i; + + for (i = 0; i < pctl->nbanks; i++) + clk_disable(pctl->banks[i].clk); + + return 0; +} + +int __maybe_unused stm32_pinctrl_resume(struct device *dev) +{ + struct stm32_pinctrl *pctl = dev_get_drvdata(dev); + struct stm32_pinctrl_group *g = pctl->groups; + int i; + + for (i = 0; i < pctl->nbanks; i++) + clk_enable(pctl->banks[i].clk); + + for (i = 0; i < pctl->ngroups; i++, g++) + stm32_pinctrl_restore_gpio_regs(pctl, g->pin); + + return 0; +} |