v4.19.13 snapshot.
diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
new file mode 100644
index 0000000..a9bec6e
--- /dev/null
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -0,0 +1,1229 @@
+// 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/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_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/slab.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_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)
+
+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;
+ 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;
+};
+
+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];
+};
+
+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;
+}
+
+/* GPIO functions */
+
+static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank,
+ unsigned offset, int value)
+{
+ if (!value)
+ offset += STM32_GPIO_PINS_PER_BANK;
+
+ clk_enable(bank->clk);
+
+ writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR);
+
+ clk_disable(bank->clk);
+}
+
+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);
+ int ret;
+
+ clk_enable(bank->clk);
+
+ ret = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset));
+
+ clk_disable(bank->clk);
+
+ return ret;
+}
+
+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 = 1;
+ else if ((alt == 0) && (mode == 1))
+ ret = 0;
+ else
+ ret = -EINVAL;
+
+ return ret;
+}
+
+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,
+};
+
+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 struct irq_chip stm32_gpio_irq_chip = {
+ .name = "stm32gpio",
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_ack = irq_chip_ack_parent,
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_set_type = irq_chip_set_type_parent,
+ .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);
+
+ regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->bank_ioport_nr);
+ return 0;
+}
+
+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;
+ irq_hw_number_t hwirq;
+
+ hwirq = fwspec->param[0];
+ 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 const struct irq_domain_ops stm32_gpio_domain_ops = {
+ .translate = stm32_gpio_domain_translate,
+ .alloc = stm32_gpio_domain_alloc,
+ .free = irq_domain_free_irqs_common,
+ .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;
+
+ for (i = 0; i < pctl->match_data->npins; i++) {
+ const struct stm32_desc_pin *pin = pctl->match_data->pins + i;
+ const struct stm32_desc_function *func = pin->functions;
+
+ if (pin->pin.number != pin_num)
+ continue;
+
+ while (func && func->name) {
+ if (func->num == fnum)
+ return true;
+ func++;
+ }
+
+ break;
+ }
+
+ 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)) {
+ dev_err(pctl->dev, "invalid function %d on pin %d .\n",
+ fnum, pin);
+ 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;
+
+ pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ pins = of_find_property(node, "pinmux", NULL);
+ if (!pins) {
+ dev_err(pctl->dev, "missing pins property in node %s .\n",
+ node->name);
+ 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)
+ return -EINVAL;
+
+ reserve = num_pins * maps_per_pin;
+
+ err = pinctrl_utils_reserve_map(pctldev, map,
+ reserved_maps, num_maps, reserve);
+ if (err)
+ return err;
+
+ for (i = 0; i < num_pins; i++) {
+ err = of_property_read_u32_index(node, "pinmux",
+ i, &pinfunc);
+ if (err)
+ return err;
+
+ pin = STM32_GET_PIN_NO(pinfunc);
+ func = STM32_GET_PIN_FUNC(pinfunc);
+
+ if (!stm32_pctrl_is_function_valid(pctl, pin, func)) {
+ dev_err(pctl->dev, "invalid function.\n");
+ return -EINVAL;
+ }
+
+ grp = stm32_pctrl_find_group_by_pin(pctl, pin);
+ if (!grp) {
+ dev_err(pctl->dev, "unable to match pin %d to group\n",
+ pin);
+ return -EINVAL;
+ }
+
+ err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map,
+ reserved_maps, num_maps);
+ if (err)
+ return err;
+
+ 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)
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+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);
+ 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 void stm32_pmx_set_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;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ 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);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+}
+
+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;
+
+ clk_enable(bank->clk);
+ 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);
+ clk_disable(bank->clk);
+}
+
+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) {
+ dev_err(pctl->dev, "invalid function %d on group %d .\n",
+ function, group);
+ 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);
+
+ stm32_pmx_set_mode(bank, pin, mode, alt);
+
+ return 0;
+}
+
+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);
+
+ stm32_pmx_set_mode(bank, pin, !input, 0);
+
+ 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,
+ .strict = true,
+};
+
+/* Pinconf functions */
+
+static void stm32_pconf_set_driving(struct stm32_gpio_bank *bank,
+ unsigned offset, u32 drive)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
+ val &= ~BIT(offset);
+ val |= drive << offset;
+ writel_relaxed(val, bank->base + STM32_GPIO_TYPER);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+}
+
+static u32 stm32_pconf_get_driving(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ val = readl_relaxed(bank->base + STM32_GPIO_TYPER);
+ val &= BIT(offset);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+
+ return (val >> offset);
+}
+
+static void stm32_pconf_set_speed(struct stm32_gpio_bank *bank,
+ unsigned offset, u32 speed)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ 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);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+}
+
+static u32 stm32_pconf_get_speed(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ 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);
+ clk_disable(bank->clk);
+
+ return (val >> (offset * 2));
+}
+
+static void stm32_pconf_set_bias(struct stm32_gpio_bank *bank,
+ unsigned offset, u32 bias)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ spin_lock_irqsave(&bank->lock, flags);
+
+ 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);
+
+ spin_unlock_irqrestore(&bank->lock, flags);
+ clk_disable(bank->clk);
+}
+
+static u32 stm32_pconf_get_bias(struct stm32_gpio_bank *bank,
+ unsigned int offset)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ 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);
+ clk_disable(bank->clk);
+
+ return (val >> (offset * 2));
+}
+
+static bool stm32_pconf_get(struct stm32_gpio_bank *bank,
+ unsigned int offset, bool dir)
+{
+ unsigned long flags;
+ u32 val;
+
+ clk_enable(bank->clk);
+ 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);
+ clk_disable(bank->clk);
+
+ 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(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);
+
+ switch (param) {
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ stm32_pconf_set_driving(bank, offset, 0);
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ stm32_pconf_set_driving(bank, offset, 1);
+ break;
+ case PIN_CONFIG_SLEW_RATE:
+ stm32_pconf_set_speed(bank, offset, arg);
+ break;
+ case PIN_CONFIG_BIAS_DISABLE:
+ stm32_pconf_set_bias(bank, offset, 0);
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ stm32_pconf_set_bias(bank, offset, 1);
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ 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 = -EINVAL;
+ }
+
+ 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++) {
+ ret = stm32_pconf_parse_conf(pctldev, g->pin,
+ pinconf_to_config_param(configs[i]),
+ pinconf_to_config_argument(configs[i]));
+ if (ret < 0)
+ return ret;
+
+ g->config = configs[i];
+ }
+
+ return 0;
+}
+
+static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned int pin)
+{
+ 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);
+
+ 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);
+ seq_printf(s, "%d - %s - %s - %s %s", alt,
+ 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_dbg_show = stm32_pconf_dbg_show,
+};
+
+static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
+ struct device_node *np)
+{
+ struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks];
+ int bank_ioport_nr;
+ struct pinctrl_gpio_range *range = &bank->range;
+ struct of_phandle_args args;
+ struct device *dev = pctl->dev;
+ struct resource res;
+ struct reset_control *rstc;
+ int npins = STM32_GPIO_PINS_PER_BANK;
+ int bank_nr, err;
+
+ rstc = of_reset_control_get_exclusive(np, NULL);
+ if (!IS_ERR(rstc))
+ reset_control_deassert(rstc);
+
+ if (of_address_to_resource(np, 0, &res))
+ return -ENODEV;
+
+ bank->base = devm_ioremap_resource(dev, &res);
+ if (IS_ERR(bank->base))
+ return PTR_ERR(bank->base);
+
+ bank->clk = of_clk_get_by_name(np, NULL);
+ if (IS_ERR(bank->clk)) {
+ dev_err(dev, "failed to get clk (%ld)\n", PTR_ERR(bank->clk));
+ return PTR_ERR(bank->clk);
+ }
+
+ err = clk_prepare(bank->clk);
+ if (err) {
+ dev_err(dev, "failed to prepare clk (%d)\n", err);
+ return err;
+ }
+
+ bank->gpio_chip = stm32_gpio_template;
+
+ of_property_read_string(np, "st,bank-name", &bank->gpio_chip.label);
+
+ if (!of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args)) {
+ bank_nr = args.args[1] / STM32_GPIO_PINS_PER_BANK;
+ bank->gpio_chip.base = args.args[1];
+ } 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 (of_property_read_u32(np, "st,bank-ioport", &bank_ioport_nr))
+ bank_ioport_nr = bank_nr;
+
+ bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
+
+ bank->gpio_chip.ngpio = npins;
+ bank->gpio_chip.of_node = np;
+ bank->gpio_chip.parent = dev;
+ bank->bank_nr = bank_nr;
+ bank->bank_ioport_nr = bank_ioport_nr;
+ spin_lock_init(&bank->lock);
+
+ /* create irq hierarchical domain */
+ bank->fwnode = of_node_to_fwnode(np);
+
+ bank->domain = irq_domain_create_hierarchy(pctl->domain, 0,
+ STM32_GPIO_IRQ_LINE, bank->fwnode,
+ &stm32_gpio_domain_ops, bank);
+
+ if (!bank->domain)
+ return -ENODEV;
+
+ err = gpiochip_add_data(&bank->gpio_chip, bank);
+ if (err) {
+ dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr);
+ return err;
+ }
+
+ dev_info(dev, "%s bank added\n", bank->gpio_chip.label);
+ return 0;
+}
+
+static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev,
+ struct stm32_pinctrl *pctl)
+{
+ struct device_node *np = pdev->dev.of_node, *parent;
+ struct device *dev = &pdev->dev;
+ struct regmap *rm;
+ int offset, ret, i;
+ int mask, mask_width;
+
+ parent = of_irq_find_parent(np);
+ if (!parent)
+ return -ENXIO;
+
+ pctl->domain = irq_find_host(parent);
+ if (!pctl->domain)
+ return -ENXIO;
+
+ 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->match_data->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->match_data->npins; i++) {
+ const struct stm32_desc_pin *pin = pctl->match_data->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;
+}
+
+int stm32_pctl_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *child;
+ const struct of_device_id *match;
+ struct device *dev = &pdev->dev;
+ struct stm32_pinctrl *pctl;
+ struct pinctrl_pin_desc *pins;
+ int i, ret, banks = 0;
+
+ if (!np)
+ return -EINVAL;
+
+ match = of_match_device(dev->driver->of_match_table, dev);
+ if (!match || !match->data)
+ return -EINVAL;
+
+ if (!of_find_property(np, "pins-are-numbered", NULL)) {
+ dev_err(dev, "only support pins-are-numbered format\n");
+ return -EINVAL;
+ }
+
+ pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
+ if (!pctl)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, pctl);
+
+ pctl->dev = dev;
+ pctl->match_data = match->data;
+ ret = stm32_pctrl_build_state(pdev);
+ if (ret) {
+ dev_err(dev, "build state failed: %d\n", ret);
+ return -EINVAL;
+ }
+
+ if (of_find_property(np, "interrupt-parent", NULL)) {
+ ret = stm32_pctrl_dt_setup_irq(pdev, pctl);
+ if (ret)
+ return ret;
+ }
+
+ pins = devm_kcalloc(&pdev->dev, pctl->match_data->npins, sizeof(*pins),
+ GFP_KERNEL);
+ if (!pins)
+ return -ENOMEM;
+
+ for (i = 0; i < pctl->match_data->npins; i++)
+ pins[i] = pctl->match_data->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->match_data->npins;
+ 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);
+ }
+
+ for_each_available_child_of_node(np, child)
+ if (of_property_read_bool(child, "gpio-controller"))
+ banks++;
+
+ 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;
+
+ for_each_available_child_of_node(np, child) {
+ if (of_property_read_bool(child, "gpio-controller")) {
+ ret = stm32_gpiolib_register_bank(pctl, child);
+ if (ret)
+ return ret;
+
+ pctl->nbanks++;
+ }
+ }
+
+ dev_info(dev, "Pinctrl STM32 initialized\n");
+
+ return 0;
+}
+