u-boot/drivers/pinctrl/pinctrl_stm32.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017-2020 STMicroelectronics - All Rights Reserved
*/
#define LOG_CATEGORY UCLASS_PINCTRL
#include <common.h>
#include <dm.h>
#include <hwspinlock.h>
#include <log.h>
#include <malloc.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <dm/pinctrl.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/libfdt.h>
#include "../gpio/stm32_gpio_priv.h"
#define MAX_PINS_ONE_IP 70
#define MODE_BITS_MASK 3
#define OSPEED_MASK 3
#define PUPD_MASK 3
#define OTYPE_MSK 1
#define AFR_MASK 0xF
struct stm32_pinctrl_priv {
struct hwspinlock hws;
int pinctrl_ngpios;
struct list_head gpio_dev;
};
struct stm32_gpio_bank {
struct udevice *gpio_dev;
struct list_head list;
};
#ifndef CONFIG_SPL_BUILD
static char pin_name[PINNAME_SIZE];
#define PINMUX_MODE_COUNT 5
static const char * const pinmux_mode[PINMUX_MODE_COUNT] = {
"gpio input",
"gpio output",
"analog",
"unknown",
"alt function",
};
static const char * const pinmux_bias[] = {
[STM32_GPIO_PUPD_NO] = "",
[STM32_GPIO_PUPD_UP] = "pull-up",
[STM32_GPIO_PUPD_DOWN] = "pull-down",
};
static const char * const pinmux_otype[] = {
[STM32_GPIO_OTYPE_PP] = "push-pull",
[STM32_GPIO_OTYPE_OD] = "open-drain",
};
static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
u32 af;
u32 alt_shift = (offset % 8) * 4;
u32 alt_index = offset / 8;
af = (readl(&regs->afr[alt_index]) &
GENMASK(alt_shift + 3, alt_shift)) >> alt_shift;
return af;
}
static int stm32_populate_gpio_dev_list(struct udevice *dev)
{
struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
struct udevice *gpio_dev;
struct udevice *child;
struct stm32_gpio_bank *gpio_bank;
int ret;
/*
* parse pin-controller sub-nodes (ie gpio bank nodes) and fill
* a list with all gpio device reference which belongs to the
* current pin-controller. This list is used to find pin_name and
* pin muxing
*/
list_for_each_entry(child, &dev->child_head, sibling_node) {
ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
&gpio_dev);
if (ret < 0)
continue;
gpio_bank = malloc(sizeof(*gpio_bank));
if (!gpio_bank) {
dev_err(dev, "Not enough memory\n");
return -ENOMEM;
}
gpio_bank->gpio_dev = gpio_dev;
list_add_tail(&gpio_bank->list, &priv->gpio_dev);
}
return 0;
}
static int stm32_pinctrl_get_pins_count(struct udevice *dev)
{
struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv;
struct stm32_gpio_bank *gpio_bank;
/*
* if get_pins_count has already been executed once on this
* pin-controller, no need to run it again
*/
if (priv->pinctrl_ngpios)
return priv->pinctrl_ngpios;
if (list_empty(&priv->gpio_dev))
stm32_populate_gpio_dev_list(dev);
/*
* walk through all banks to retrieve the pin-controller
* pins number
*/
list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
priv->pinctrl_ngpios += uc_priv->gpio_count;
}
return priv->pinctrl_ngpios;
}
static struct udevice *stm32_pinctrl_get_gpio_dev(struct udevice *dev,
unsigned int selector,
unsigned int *idx)
{
struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
struct stm32_gpio_bank *gpio_bank;
struct gpio_dev_priv *uc_priv;
int pin_count = 0;
if (list_empty(&priv->gpio_dev))
stm32_populate_gpio_dev_list(dev);
/* look up for the bank which owns the requested pin */
list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
if (selector < (pin_count + uc_priv->gpio_count)) {
/*
* we found the bank, convert pin selector to
* gpio bank index
*/
*idx = stm32_offset_to_index(gpio_bank->gpio_dev,
selector - pin_count);
if (IS_ERR_VALUE(*idx))
return NULL;
return gpio_bank->gpio_dev;
}
pin_count += uc_priv->gpio_count;
}
return NULL;
}
static const char *stm32_pinctrl_get_pin_name(struct udevice *dev,
unsigned int selector)
{
struct gpio_dev_priv *uc_priv;
struct udevice *gpio_dev;
unsigned int gpio_idx;
/* look up for the bank which owns the requested pin */
gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
if (!gpio_dev) {
snprintf(pin_name, PINNAME_SIZE, "Error");
} else {
uc_priv = dev_get_uclass_priv(gpio_dev);
snprintf(pin_name, PINNAME_SIZE, "%s%d",
uc_priv->bank_name,
gpio_idx);
}
return pin_name;
}
static int stm32_pinctrl_get_pin_muxing(struct udevice *dev,
unsigned int selector,
char *buf,
int size)
{
struct udevice *gpio_dev;
struct stm32_gpio_priv *priv;
const char *label;
int mode;
int af_num;
unsigned int gpio_idx;
u32 pupd, otype;
/* look up for the bank which owns the requested pin */
gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
if (!gpio_dev)
return -ENODEV;
mode = gpio_get_raw_function(gpio_dev, gpio_idx, &label);
dev_dbg(dev, "selector = %d gpio_idx = %d mode = %d\n",
selector, gpio_idx, mode);
priv = dev_get_priv(gpio_dev);
pupd = (readl(&priv->regs->pupdr) >> (gpio_idx * 2)) & PUPD_MASK;
otype = (readl(&priv->regs->otyper) >> gpio_idx) & OTYPE_MSK;
switch (mode) {
case GPIOF_UNKNOWN:
/* should never happen */
return -EINVAL;
case GPIOF_UNUSED:
snprintf(buf, size, "%s", pinmux_mode[mode]);
break;
case GPIOF_FUNC:
af_num = stm32_pinctrl_get_af(gpio_dev, gpio_idx);
snprintf(buf, size, "%s %d %s %s", pinmux_mode[mode], af_num,
pinmux_otype[otype], pinmux_bias[pupd]);
break;
case GPIOF_OUTPUT:
snprintf(buf, size, "%s %s %s %s",
pinmux_mode[mode], pinmux_otype[otype],
pinmux_bias[pupd], label ? label : "");
break;
case GPIOF_INPUT:
snprintf(buf, size, "%s %s %s", pinmux_mode[mode],
pinmux_bias[pupd], label ? label : "");
break;
}
return 0;
}
#endif
static int stm32_pinctrl_probe(struct udevice *dev)
{
struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
int ret;
INIT_LIST_HEAD(&priv->gpio_dev);
/* hwspinlock property is optional, just log the error */
ret = hwspinlock_get_by_index(dev, 0, &priv->hws);
if (ret)
dev_dbg(dev, "hwspinlock_get_by_index may have failed (%d)\n",
ret);
return 0;
}
static int stm32_gpio_config(struct gpio_desc *desc,
const struct stm32_gpio_ctl *ctl)
{
struct stm32_gpio_priv *priv = dev_get_priv(desc->dev);
struct stm32_gpio_regs *regs = priv->regs;
struct stm32_pinctrl_priv *ctrl_priv;
int ret;
u32 index;
if (!ctl || ctl->af > 15 || ctl->mode > 3 || ctl->otype > 1 ||
ctl->pupd > 2 || ctl->speed > 3)
return -EINVAL;
ctrl_priv = dev_get_priv(dev_get_parent(desc->dev));
ret = hwspinlock_lock_timeout(&ctrl_priv->hws, 10);
if (ret == -ETIME) {
dev_err(desc->dev, "HWSpinlock timeout\n");
return ret;
}
index = (desc->offset & 0x07) * 4;
clrsetbits_le32(&regs->afr[desc->offset >> 3], AFR_MASK << index,
ctl->af << index);
index = desc->offset * 2;
clrsetbits_le32(&regs->moder, MODE_BITS_MASK << index,
ctl->mode << index);
clrsetbits_le32(&regs->ospeedr, OSPEED_MASK << index,
ctl->speed << index);
clrsetbits_le32(&regs->pupdr, PUPD_MASK << index, ctl->pupd << index);
index = desc->offset;
clrsetbits_le32(&regs->otyper, OTYPE_MSK << index, ctl->otype << index);
hwspinlock_unlock(&ctrl_priv->hws);
return 0;
}
static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin)
{
gpio_dsc->port = (port_pin & 0x1F000) >> 12;
gpio_dsc->pin = (port_pin & 0x0F00) >> 8;
log_debug("GPIO:port= %d, pin= %d\n", gpio_dsc->port, gpio_dsc->pin);
return 0;
}
static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn,
ofnode node)
{
gpio_fn &= 0x00FF;
gpio_ctl->af = 0;
switch (gpio_fn) {
case 0:
gpio_ctl->mode = STM32_GPIO_MODE_IN;
break;
case 1 ... 16:
gpio_ctl->mode = STM32_GPIO_MODE_AF;
gpio_ctl->af = gpio_fn - 1;
break;
case 17:
gpio_ctl->mode = STM32_GPIO_MODE_AN;
break;
default:
gpio_ctl->mode = STM32_GPIO_MODE_OUT;
break;
}
gpio_ctl->speed = ofnode_read_u32_default(node, "slew-rate", 0);
if (ofnode_read_bool(node, "drive-open-drain"))
gpio_ctl->otype = STM32_GPIO_OTYPE_OD;
else
gpio_ctl->otype = STM32_GPIO_OTYPE_PP;
if (ofnode_read_bool(node, "bias-pull-up"))
gpio_ctl->pupd = STM32_GPIO_PUPD_UP;
else if (ofnode_read_bool(node, "bias-pull-down"))
gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN;
else
gpio_ctl->pupd = STM32_GPIO_PUPD_NO;
log_debug("gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n",
gpio_fn, gpio_ctl->speed, gpio_ctl->otype,
gpio_ctl->pupd);
return 0;
}
static int stm32_pinctrl_config(ofnode node)
{
u32 pin_mux[MAX_PINS_ONE_IP];
int rv, len;
ofnode subnode;
/*
* check for "pinmux" property in each subnode (e.g. pins1 and pins2 for
* usart1) of pin controller phandle "pinctrl-0"
* */
ofnode_for_each_subnode(subnode, node) {
struct stm32_gpio_dsc gpio_dsc;
struct stm32_gpio_ctl gpio_ctl;
int i;
rv = ofnode_read_size(subnode, "pinmux");
if (rv < 0)
return rv;
len = rv / sizeof(pin_mux[0]);
log_debug("No of pinmux entries= %d\n", len);
if (len > MAX_PINS_ONE_IP)
return -EINVAL;
rv = ofnode_read_u32_array(subnode, "pinmux", pin_mux, len);
if (rv < 0)
return rv;
for (i = 0; i < len; i++) {
struct gpio_desc desc;
log_debug("pinmux = %x\n", *(pin_mux + i));
prep_gpio_dsc(&gpio_dsc, *(pin_mux + i));
prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), subnode);
rv = uclass_get_device_by_seq(UCLASS_GPIO,
gpio_dsc.port,
&desc.dev);
if (rv)
return rv;
desc.offset = gpio_dsc.pin;
rv = stm32_gpio_config(&desc, &gpio_ctl);
log_debug("rv = %d\n\n", rv);
if (rv)
return rv;
}
}
return 0;
}
static int stm32_pinctrl_bind(struct udevice *dev)
{
ofnode node;
const char *name;
int ret;
dev_for_each_subnode(node, dev) {
dev_dbg(dev, "bind %s\n", ofnode_get_name(node));
if (!ofnode_is_enabled(node))
continue;
ofnode_get_property(node, "gpio-controller", &ret);
if (ret < 0)
continue;
/* Get the name of each gpio node */
name = ofnode_get_name(node);
if (!name)
return -EINVAL;
/* Bind each gpio node */
ret = device_bind_driver_to_node(dev, "gpio_stm32",
name, node, NULL);
if (ret)
return ret;
dev_dbg(dev, "bind %s\n", name);
}
return 0;
}
#if CONFIG_IS_ENABLED(PINCTRL_FULL)
static int stm32_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
return stm32_pinctrl_config(dev_ofnode(config));
}
#else /* PINCTRL_FULL */
static int stm32_pinctrl_set_state_simple(struct udevice *dev,
struct udevice *periph)
{
const fdt32_t *list;
uint32_t phandle;
ofnode config_node;
int size, i, ret;
list = ofnode_get_property(dev_ofnode(periph), "pinctrl-0", &size);
if (!list)
return -EINVAL;
dev_dbg(dev, "periph->name = %s\n", periph->name);
size /= sizeof(*list);
for (i = 0; i < size; i++) {
phandle = fdt32_to_cpu(*list++);
config_node = ofnode_get_by_phandle(phandle);
if (!ofnode_valid(config_node)) {
dev_err(periph,
"prop pinctrl-0 index %d invalid phandle\n", i);
return -EINVAL;
}
ret = stm32_pinctrl_config(config_node);
if (ret)
return ret;
}
return 0;
}
#endif /* PINCTRL_FULL */
static struct pinctrl_ops stm32_pinctrl_ops = {
#if CONFIG_IS_ENABLED(PINCTRL_FULL)
.set_state = stm32_pinctrl_set_state,
#else /* PINCTRL_FULL */
.set_state_simple = stm32_pinctrl_set_state_simple,
#endif /* PINCTRL_FULL */
#ifndef CONFIG_SPL_BUILD
.get_pin_name = stm32_pinctrl_get_pin_name,
.get_pins_count = stm32_pinctrl_get_pins_count,
.get_pin_muxing = stm32_pinctrl_get_pin_muxing,
#endif
};
static const struct udevice_id stm32_pinctrl_ids[] = {
{ .compatible = "st,stm32f429-pinctrl" },
{ .compatible = "st,stm32f469-pinctrl" },
{ .compatible = "st,stm32f746-pinctrl" },
{ .compatible = "st,stm32f769-pinctrl" },
{ .compatible = "st,stm32h743-pinctrl" },
{ .compatible = "st,stm32mp157-pinctrl" },
{ .compatible = "st,stm32mp157-z-pinctrl" },
{ }
};
U_BOOT_DRIVER(pinctrl_stm32) = {
.name = "pinctrl_stm32",
.id = UCLASS_PINCTRL,
.of_match = stm32_pinctrl_ids,
.ops = &stm32_pinctrl_ops,
.bind = stm32_pinctrl_bind,
.probe = stm32_pinctrl_probe,
.priv_auto = sizeof(struct stm32_pinctrl_priv),
};