994 lines
23 KiB
C
994 lines
23 KiB
C
/*
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* Copyright (C) Maxime Coquelin 2015
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* Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
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* License terms: GNU General Public License (GPL), version 2
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*
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* Heavily based on Mediatek's pinctrl driver
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*/
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#include <linux/clk.h>
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#include <linux/gpio/driver.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/pinctrl/machine.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/slab.h>
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#include "../core.h"
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#include "../pinconf.h"
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#include "../pinctrl-utils.h"
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#include "pinctrl-stm32.h"
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#define STM32_GPIO_MODER 0x00
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#define STM32_GPIO_TYPER 0x04
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#define STM32_GPIO_SPEEDR 0x08
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#define STM32_GPIO_PUPDR 0x0c
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#define STM32_GPIO_IDR 0x10
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#define STM32_GPIO_ODR 0x14
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#define STM32_GPIO_BSRR 0x18
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#define STM32_GPIO_LCKR 0x1c
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#define STM32_GPIO_AFRL 0x20
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#define STM32_GPIO_AFRH 0x24
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#define STM32_GPIO_PINS_PER_BANK 16
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#define gpio_range_to_bank(chip) \
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container_of(chip, struct stm32_gpio_bank, range)
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static const char * const stm32_gpio_functions[] = {
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"gpio", "af0", "af1",
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"af2", "af3", "af4",
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"af5", "af6", "af7",
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"af8", "af9", "af10",
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"af11", "af12", "af13",
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"af14", "af15", "analog",
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};
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struct stm32_pinctrl_group {
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const char *name;
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unsigned long config;
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unsigned pin;
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};
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struct stm32_gpio_bank {
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void __iomem *base;
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struct clk *clk;
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spinlock_t lock;
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struct gpio_chip gpio_chip;
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struct pinctrl_gpio_range range;
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};
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struct stm32_pinctrl {
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struct device *dev;
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struct pinctrl_dev *pctl_dev;
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struct pinctrl_desc pctl_desc;
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struct stm32_pinctrl_group *groups;
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unsigned ngroups;
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const char **grp_names;
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struct stm32_gpio_bank *banks;
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unsigned nbanks;
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const struct stm32_pinctrl_match_data *match_data;
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};
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static inline int stm32_gpio_pin(int gpio)
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{
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return gpio % STM32_GPIO_PINS_PER_BANK;
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}
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static inline u32 stm32_gpio_get_mode(u32 function)
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{
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switch (function) {
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case STM32_PIN_GPIO:
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return 0;
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case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
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return 2;
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case STM32_PIN_ANALOG:
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return 3;
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}
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return 0;
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}
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static inline u32 stm32_gpio_get_alt(u32 function)
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{
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switch (function) {
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case STM32_PIN_GPIO:
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return 0;
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case STM32_PIN_AF(0) ... STM32_PIN_AF(15):
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return function - 1;
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case STM32_PIN_ANALOG:
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return 0;
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}
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return 0;
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}
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/* GPIO functions */
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static inline void __stm32_gpio_set(struct stm32_gpio_bank *bank,
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unsigned offset, int value)
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{
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if (!value)
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offset += STM32_GPIO_PINS_PER_BANK;
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clk_enable(bank->clk);
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writel_relaxed(BIT(offset), bank->base + STM32_GPIO_BSRR);
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clk_disable(bank->clk);
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}
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static int stm32_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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return pinctrl_request_gpio(chip->base + offset);
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}
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static void stm32_gpio_free(struct gpio_chip *chip, unsigned offset)
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{
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pinctrl_free_gpio(chip->base + offset);
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}
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static int stm32_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
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int ret;
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clk_enable(bank->clk);
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ret = !!(readl_relaxed(bank->base + STM32_GPIO_IDR) & BIT(offset));
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clk_disable(bank->clk);
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return ret;
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}
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static void stm32_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
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__stm32_gpio_set(bank, offset, value);
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}
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static int stm32_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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return pinctrl_gpio_direction_input(chip->base + offset);
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}
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static int stm32_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
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__stm32_gpio_set(bank, offset, value);
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pinctrl_gpio_direction_output(chip->base + offset);
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return 0;
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}
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static struct gpio_chip stm32_gpio_template = {
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.request = stm32_gpio_request,
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.free = stm32_gpio_free,
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.get = stm32_gpio_get,
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.set = stm32_gpio_set,
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.direction_input = stm32_gpio_direction_input,
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.direction_output = stm32_gpio_direction_output,
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};
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/* Pinctrl functions */
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static struct stm32_pinctrl_group *
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stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin)
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{
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int i;
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for (i = 0; i < pctl->ngroups; i++) {
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struct stm32_pinctrl_group *grp = pctl->groups + i;
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if (grp->pin == pin)
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return grp;
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}
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return NULL;
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}
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static bool stm32_pctrl_is_function_valid(struct stm32_pinctrl *pctl,
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u32 pin_num, u32 fnum)
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{
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int i;
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for (i = 0; i < pctl->match_data->npins; i++) {
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const struct stm32_desc_pin *pin = pctl->match_data->pins + i;
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const struct stm32_desc_function *func = pin->functions;
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if (pin->pin.number != pin_num)
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continue;
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while (func && func->name) {
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if (func->num == fnum)
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return true;
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func++;
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}
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break;
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}
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return false;
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}
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static int stm32_pctrl_dt_node_to_map_func(struct stm32_pinctrl *pctl,
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u32 pin, u32 fnum, struct stm32_pinctrl_group *grp,
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struct pinctrl_map **map, unsigned *reserved_maps,
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unsigned *num_maps)
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{
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if (*num_maps == *reserved_maps)
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return -ENOSPC;
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(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
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(*map)[*num_maps].data.mux.group = grp->name;
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if (!stm32_pctrl_is_function_valid(pctl, pin, fnum)) {
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dev_err(pctl->dev, "invalid function %d on pin %d .\n",
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fnum, pin);
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return -EINVAL;
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}
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(*map)[*num_maps].data.mux.function = stm32_gpio_functions[fnum];
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(*num_maps)++;
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return 0;
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}
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static int stm32_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
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struct device_node *node,
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struct pinctrl_map **map,
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unsigned *reserved_maps,
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unsigned *num_maps)
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{
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struct stm32_pinctrl *pctl;
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struct stm32_pinctrl_group *grp;
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struct property *pins;
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u32 pinfunc, pin, func;
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unsigned long *configs;
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unsigned int num_configs;
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bool has_config = 0;
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unsigned reserve = 0;
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int num_pins, num_funcs, maps_per_pin, i, err;
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pctl = pinctrl_dev_get_drvdata(pctldev);
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pins = of_find_property(node, "pinmux", NULL);
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if (!pins) {
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dev_err(pctl->dev, "missing pins property in node %s .\n",
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node->name);
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return -EINVAL;
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}
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err = pinconf_generic_parse_dt_config(node, pctldev, &configs,
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&num_configs);
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if (err)
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return err;
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if (num_configs)
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has_config = 1;
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num_pins = pins->length / sizeof(u32);
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num_funcs = num_pins;
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maps_per_pin = 0;
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if (num_funcs)
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maps_per_pin++;
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if (has_config && num_pins >= 1)
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maps_per_pin++;
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if (!num_pins || !maps_per_pin)
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return -EINVAL;
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reserve = num_pins * maps_per_pin;
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err = pinctrl_utils_reserve_map(pctldev, map,
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reserved_maps, num_maps, reserve);
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if (err)
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return err;
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for (i = 0; i < num_pins; i++) {
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err = of_property_read_u32_index(node, "pinmux",
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i, &pinfunc);
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if (err)
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return err;
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pin = STM32_GET_PIN_NO(pinfunc);
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func = STM32_GET_PIN_FUNC(pinfunc);
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if (pin >= pctl->match_data->npins) {
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dev_err(pctl->dev, "invalid pin number.\n");
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return -EINVAL;
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}
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if (!stm32_pctrl_is_function_valid(pctl, pin, func)) {
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dev_err(pctl->dev, "invalid function.\n");
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return -EINVAL;
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}
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grp = stm32_pctrl_find_group_by_pin(pctl, pin);
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if (!grp) {
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dev_err(pctl->dev, "unable to match pin %d to group\n",
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pin);
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return -EINVAL;
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}
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err = stm32_pctrl_dt_node_to_map_func(pctl, pin, func, grp, map,
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reserved_maps, num_maps);
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if (err)
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return err;
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if (has_config) {
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err = pinctrl_utils_add_map_configs(pctldev, map,
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reserved_maps, num_maps, grp->name,
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configs, num_configs,
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PIN_MAP_TYPE_CONFIGS_GROUP);
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if (err)
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return err;
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}
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}
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return 0;
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}
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static int stm32_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np_config,
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struct pinctrl_map **map, unsigned *num_maps)
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{
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struct device_node *np;
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unsigned reserved_maps;
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int ret;
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*map = NULL;
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*num_maps = 0;
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reserved_maps = 0;
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for_each_child_of_node(np_config, np) {
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ret = stm32_pctrl_dt_subnode_to_map(pctldev, np, map,
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&reserved_maps, num_maps);
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if (ret < 0) {
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pinctrl_utils_free_map(pctldev, *map, *num_maps);
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return ret;
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}
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}
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return 0;
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}
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static int stm32_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
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{
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struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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return pctl->ngroups;
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}
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static const char *stm32_pctrl_get_group_name(struct pinctrl_dev *pctldev,
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unsigned group)
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{
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struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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return pctl->groups[group].name;
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}
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static int stm32_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned group,
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const unsigned **pins,
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unsigned *num_pins)
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{
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struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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*pins = (unsigned *)&pctl->groups[group].pin;
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*num_pins = 1;
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return 0;
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}
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static const struct pinctrl_ops stm32_pctrl_ops = {
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.dt_node_to_map = stm32_pctrl_dt_node_to_map,
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.dt_free_map = pinctrl_utils_free_map,
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.get_groups_count = stm32_pctrl_get_groups_count,
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.get_group_name = stm32_pctrl_get_group_name,
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.get_group_pins = stm32_pctrl_get_group_pins,
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};
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/* Pinmux functions */
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static int stm32_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
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{
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return ARRAY_SIZE(stm32_gpio_functions);
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}
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static const char *stm32_pmx_get_func_name(struct pinctrl_dev *pctldev,
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unsigned selector)
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{
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return stm32_gpio_functions[selector];
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}
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static int stm32_pmx_get_func_groups(struct pinctrl_dev *pctldev,
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unsigned function,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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*groups = pctl->grp_names;
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*num_groups = pctl->ngroups;
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return 0;
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}
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static void stm32_pmx_set_mode(struct stm32_gpio_bank *bank,
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int pin, u32 mode, u32 alt)
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{
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u32 val;
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int alt_shift = (pin % 8) * 4;
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int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
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unsigned long flags;
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clk_enable(bank->clk);
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spin_lock_irqsave(&bank->lock, flags);
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val = readl_relaxed(bank->base + alt_offset);
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val &= ~GENMASK(alt_shift + 3, alt_shift);
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val |= (alt << alt_shift);
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writel_relaxed(val, bank->base + alt_offset);
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val = readl_relaxed(bank->base + STM32_GPIO_MODER);
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val &= ~GENMASK(pin * 2 + 1, pin * 2);
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val |= mode << (pin * 2);
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writel_relaxed(val, bank->base + STM32_GPIO_MODER);
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spin_unlock_irqrestore(&bank->lock, flags);
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clk_disable(bank->clk);
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}
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static void stm32_pmx_get_mode(struct stm32_gpio_bank *bank,
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int pin, u32 *mode, u32 *alt)
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{
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u32 val;
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int alt_shift = (pin % 8) * 4;
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int alt_offset = STM32_GPIO_AFRL + (pin / 8) * 4;
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unsigned long flags;
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clk_enable(bank->clk);
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spin_lock_irqsave(&bank->lock, flags);
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val = readl_relaxed(bank->base + alt_offset);
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val &= GENMASK(alt_shift + 3, alt_shift);
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*alt = val >> alt_shift;
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val = readl_relaxed(bank->base + STM32_GPIO_MODER);
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val &= GENMASK(pin * 2 + 1, pin * 2);
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*mode = val >> (pin * 2);
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spin_unlock_irqrestore(&bank->lock, flags);
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clk_disable(bank->clk);
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}
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static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
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unsigned function,
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unsigned group)
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{
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bool ret;
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struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
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struct stm32_pinctrl_group *g = pctl->groups + group;
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struct pinctrl_gpio_range *range;
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struct stm32_gpio_bank *bank;
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u32 mode, alt;
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int pin;
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ret = stm32_pctrl_is_function_valid(pctl, g->pin, function);
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if (!ret) {
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dev_err(pctl->dev, "invalid function %d on group %d .\n",
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function, group);
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return -EINVAL;
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}
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range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin);
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bank = gpio_range_to_bank(range);
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pin = stm32_gpio_pin(g->pin);
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mode = stm32_gpio_get_mode(function);
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alt = stm32_gpio_get_alt(function);
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stm32_pmx_set_mode(bank, pin, mode, alt);
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return 0;
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}
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static int stm32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range, unsigned gpio,
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bool input)
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{
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struct stm32_gpio_bank *bank = gpio_range_to_bank(range);
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int pin = stm32_gpio_pin(gpio);
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stm32_pmx_set_mode(bank, pin, !input, 0);
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return 0;
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}
|
|
|
|
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,
|
|
};
|
|
|
|
/* 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 pinctrl_gpio_range *range;
|
|
struct stm32_gpio_bank *bank;
|
|
int offset, ret = 0;
|
|
|
|
range = pinctrl_find_gpio_range_from_pin(pctldev, pin);
|
|
bank = gpio_range_to_bank(range);
|
|
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, NULL, 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);
|
|
bank = gpio_range_to_bank(range);
|
|
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)
|
|
{
|
|
int bank_nr = pctl->nbanks;
|
|
struct stm32_gpio_bank *bank = &pctl->banks[bank_nr];
|
|
struct pinctrl_gpio_range *range = &bank->range;
|
|
struct device *dev = pctl->dev;
|
|
struct resource res;
|
|
struct reset_control *rstc;
|
|
int err, npins;
|
|
|
|
rstc = of_reset_control_get(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;
|
|
}
|
|
|
|
npins = pctl->match_data->npins;
|
|
npins -= bank_nr * STM32_GPIO_PINS_PER_BANK;
|
|
if (npins < 0)
|
|
return -EINVAL;
|
|
else if (npins > STM32_GPIO_PINS_PER_BANK)
|
|
npins = STM32_GPIO_PINS_PER_BANK;
|
|
|
|
bank->gpio_chip = stm32_gpio_template;
|
|
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;
|
|
spin_lock_init(&bank->lock);
|
|
|
|
of_property_read_string(np, "st,bank-name", &range->name);
|
|
bank->gpio_chip.label = range->name;
|
|
|
|
range->id = bank_nr;
|
|
range->pin_base = range->base = range->id * STM32_GPIO_PINS_PER_BANK;
|
|
range->npins = bank->gpio_chip.ngpio;
|
|
range->gc = &bank->gpio_chip;
|
|
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", range->name);
|
|
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;
|
|
}
|
|
|
|
for_each_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_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++;
|
|
}
|
|
}
|
|
|
|
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 (i = 0; i < pctl->nbanks; i++)
|
|
pinctrl_add_gpio_range(pctl->pctl_dev, &pctl->banks[i].range);
|
|
|
|
dev_info(dev, "Pinctrl STM32 initialized\n");
|
|
|
|
return 0;
|
|
}
|
|
|