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linux-zen-desktop/drivers/pinctrl/stm32/pinctrl-stm32.c

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Initial commit
2023-08-30 17:31:07 +02:00
// 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_address.h>
#include <linux/of_device.h>
#include <linux/of.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 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;
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;
}
}
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;
6.5.5
2023-10-24 12:59:35 +02:00
if (!of_property_present(np, "interrupt-parent"))
Initial commit
2023-08-30 17:31:07 +02:00
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;
}