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https://github.com/AsahiLinux/u-boot
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2c38f7c318
Populate uc_priv->name[] with pinmux node's name in order to indicate the pinmuxing's name in case GPIO is configured in alternate. For example, for STM32 SoC's based platform, "gpio status" command output : before Bank GPIOZ: GPIOZ0: unused : 0 [ ] GPIOZ1: unused : 0 [ ] GPIOZ2: unused : 0 [ ] GPIOZ3: unused : 0 [ ] GPIOZ4: func GPIOZ5: func GPIOZ6: unused : 0 [ ] GPIOZ7: unused : 0 [ ] GPIOZ8: unknown GPIOZ9: unknown GPIOZ10: unknown GPIOZ11: unknown GPIOZ12: unknown GPIOZ13: unknown GPIOZ14: unknown GPIOZ15: unknown After Bank GPIOZ: GPIOZ0: unused : 0 [ ] GPIOZ1: unused : 0 [ ] GPIOZ2: unused : 0 [ ] GPIOZ3: unused : 0 [ ] GPIOZ4: func i2c4-0 GPIOZ5: func i2c4-0 GPIOZ6: unused : 0 [ ] GPIOZ7: unused : 0 [ ] GPIOZ8: unknown GPIOZ9: unknown GPIOZ10: unknown GPIOZ11: unknown GPIOZ12: unknown GPIOZ13: unknown GPIOZ14: unknown GPIOZ15: unknown Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
507 lines
12 KiB
C
507 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017-2020 STMicroelectronics - All Rights Reserved
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*/
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#define LOG_CATEGORY UCLASS_PINCTRL
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#include <common.h>
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#include <dm.h>
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#include <hwspinlock.h>
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#include <log.h>
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#include <malloc.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <dm/device_compat.h>
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#include <dm/lists.h>
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#include <dm/pinctrl.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/libfdt.h>
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#include "../gpio/stm32_gpio_priv.h"
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#define MAX_PINS_ONE_IP 70
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#define MODE_BITS_MASK 3
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#define OSPEED_MASK 3
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#define PUPD_MASK 3
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#define OTYPE_MSK 1
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#define AFR_MASK 0xF
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struct stm32_pinctrl_priv {
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struct hwspinlock hws;
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int pinctrl_ngpios;
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struct list_head gpio_dev;
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};
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struct stm32_gpio_bank {
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struct udevice *gpio_dev;
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struct list_head list;
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};
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#ifndef CONFIG_SPL_BUILD
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static char pin_name[PINNAME_SIZE];
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static const char * const pinmux_mode[GPIOF_COUNT] = {
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[GPIOF_INPUT] = "gpio input",
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[GPIOF_OUTPUT] = "gpio output",
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[GPIOF_UNUSED] = "analog",
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[GPIOF_UNKNOWN] = "unknown",
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[GPIOF_FUNC] = "alt function",
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};
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static const char * const pinmux_bias[] = {
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[STM32_GPIO_PUPD_NO] = "",
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[STM32_GPIO_PUPD_UP] = "pull-up",
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[STM32_GPIO_PUPD_DOWN] = "pull-down",
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};
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static const char * const pinmux_otype[] = {
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[STM32_GPIO_OTYPE_PP] = "push-pull",
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[STM32_GPIO_OTYPE_OD] = "open-drain",
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};
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static int stm32_pinctrl_get_af(struct udevice *dev, unsigned int offset)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_regs *regs = priv->regs;
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u32 af;
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u32 alt_shift = (offset % 8) * 4;
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u32 alt_index = offset / 8;
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af = (readl(®s->afr[alt_index]) &
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GENMASK(alt_shift + 3, alt_shift)) >> alt_shift;
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return af;
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}
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static int stm32_populate_gpio_dev_list(struct udevice *dev)
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{
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struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
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struct udevice *gpio_dev;
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struct udevice *child;
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struct stm32_gpio_bank *gpio_bank;
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int ret;
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/*
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* parse pin-controller sub-nodes (ie gpio bank nodes) and fill
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* a list with all gpio device reference which belongs to the
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* current pin-controller. This list is used to find pin_name and
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* pin muxing
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*/
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list_for_each_entry(child, &dev->child_head, sibling_node) {
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ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
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&gpio_dev);
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if (ret < 0)
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continue;
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gpio_bank = malloc(sizeof(*gpio_bank));
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if (!gpio_bank) {
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dev_err(dev, "Not enough memory\n");
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return -ENOMEM;
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}
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gpio_bank->gpio_dev = gpio_dev;
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list_add_tail(&gpio_bank->list, &priv->gpio_dev);
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}
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return 0;
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}
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static int stm32_pinctrl_get_pins_count(struct udevice *dev)
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{
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struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
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struct gpio_dev_priv *uc_priv;
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struct stm32_gpio_bank *gpio_bank;
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/*
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* if get_pins_count has already been executed once on this
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* pin-controller, no need to run it again
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*/
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if (priv->pinctrl_ngpios)
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return priv->pinctrl_ngpios;
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if (list_empty(&priv->gpio_dev))
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stm32_populate_gpio_dev_list(dev);
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/*
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* walk through all banks to retrieve the pin-controller
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* pins number
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*/
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list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
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uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
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priv->pinctrl_ngpios += uc_priv->gpio_count;
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}
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return priv->pinctrl_ngpios;
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}
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static struct udevice *stm32_pinctrl_get_gpio_dev(struct udevice *dev,
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unsigned int selector,
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unsigned int *idx)
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{
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struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
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struct stm32_gpio_bank *gpio_bank;
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struct gpio_dev_priv *uc_priv;
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int pin_count = 0;
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if (list_empty(&priv->gpio_dev))
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stm32_populate_gpio_dev_list(dev);
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/* look up for the bank which owns the requested pin */
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list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
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uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
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if (selector < (pin_count + uc_priv->gpio_count)) {
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/*
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* we found the bank, convert pin selector to
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* gpio bank index
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*/
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*idx = selector - pin_count;
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return gpio_bank->gpio_dev;
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}
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pin_count += uc_priv->gpio_count;
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}
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return NULL;
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}
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static const char *stm32_pinctrl_get_pin_name(struct udevice *dev,
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unsigned int selector)
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{
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struct gpio_dev_priv *uc_priv;
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struct udevice *gpio_dev;
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unsigned int gpio_idx;
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/* look up for the bank which owns the requested pin */
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gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
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if (!gpio_dev) {
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snprintf(pin_name, PINNAME_SIZE, "Error");
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} else {
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uc_priv = dev_get_uclass_priv(gpio_dev);
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snprintf(pin_name, PINNAME_SIZE, "%s%d",
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uc_priv->bank_name,
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gpio_idx);
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}
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return pin_name;
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}
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static int stm32_pinctrl_get_pin_muxing(struct udevice *dev,
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unsigned int selector,
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char *buf,
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int size)
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{
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struct udevice *gpio_dev;
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struct stm32_gpio_priv *priv;
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const char *label;
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int mode;
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int af_num;
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unsigned int gpio_idx;
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u32 pupd, otype;
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/* look up for the bank which owns the requested pin */
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gpio_dev = stm32_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
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if (!gpio_dev)
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return -ENODEV;
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mode = gpio_get_raw_function(gpio_dev, gpio_idx, &label);
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dev_dbg(dev, "selector = %d gpio_idx = %d mode = %d\n",
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selector, gpio_idx, mode);
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priv = dev_get_priv(gpio_dev);
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pupd = (readl(&priv->regs->pupdr) >> (gpio_idx * 2)) & PUPD_MASK;
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otype = (readl(&priv->regs->otyper) >> gpio_idx) & OTYPE_MSK;
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switch (mode) {
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case GPIOF_UNKNOWN:
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case GPIOF_UNUSED:
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snprintf(buf, size, "%s", pinmux_mode[mode]);
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break;
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case GPIOF_FUNC:
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af_num = stm32_pinctrl_get_af(gpio_dev, gpio_idx);
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snprintf(buf, size, "%s %d %s %s", pinmux_mode[mode], af_num,
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pinmux_otype[otype], pinmux_bias[pupd]);
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break;
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case GPIOF_OUTPUT:
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snprintf(buf, size, "%s %s %s %s",
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pinmux_mode[mode], pinmux_otype[otype],
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pinmux_bias[pupd], label ? label : "");
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break;
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case GPIOF_INPUT:
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snprintf(buf, size, "%s %s %s", pinmux_mode[mode],
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pinmux_bias[pupd], label ? label : "");
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break;
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}
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return 0;
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}
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#endif
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static int stm32_pinctrl_probe(struct udevice *dev)
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{
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struct stm32_pinctrl_priv *priv = dev_get_priv(dev);
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int ret;
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INIT_LIST_HEAD(&priv->gpio_dev);
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/* hwspinlock property is optional, just log the error */
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ret = hwspinlock_get_by_index(dev, 0, &priv->hws);
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if (ret)
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dev_dbg(dev, "hwspinlock_get_by_index may have failed (%d)\n",
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ret);
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return 0;
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}
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static int stm32_gpio_config(ofnode node,
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struct gpio_desc *desc,
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const struct stm32_gpio_ctl *ctl)
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{
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struct stm32_gpio_priv *priv = dev_get_priv(desc->dev);
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc->dev);
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struct stm32_gpio_regs *regs = priv->regs;
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struct stm32_pinctrl_priv *ctrl_priv;
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int ret;
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u32 index;
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if (!ctl || ctl->af > 15 || ctl->mode > 3 || ctl->otype > 1 ||
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ctl->pupd > 2 || ctl->speed > 3)
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return -EINVAL;
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ctrl_priv = dev_get_priv(dev_get_parent(desc->dev));
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ret = hwspinlock_lock_timeout(&ctrl_priv->hws, 10);
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if (ret == -ETIME) {
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dev_err(desc->dev, "HWSpinlock timeout\n");
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return ret;
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}
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index = (desc->offset & 0x07) * 4;
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clrsetbits_le32(®s->afr[desc->offset >> 3], AFR_MASK << index,
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ctl->af << index);
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index = desc->offset * 2;
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clrsetbits_le32(®s->moder, MODE_BITS_MASK << index,
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ctl->mode << index);
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clrsetbits_le32(®s->ospeedr, OSPEED_MASK << index,
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ctl->speed << index);
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clrsetbits_le32(®s->pupdr, PUPD_MASK << index, ctl->pupd << index);
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index = desc->offset;
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clrsetbits_le32(®s->otyper, OTYPE_MSK << index, ctl->otype << index);
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uc_priv->name[desc->offset] = strdup(ofnode_get_name(node));
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hwspinlock_unlock(&ctrl_priv->hws);
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return 0;
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}
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static int prep_gpio_dsc(struct stm32_gpio_dsc *gpio_dsc, u32 port_pin)
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{
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gpio_dsc->port = (port_pin & 0x1F000) >> 12;
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gpio_dsc->pin = (port_pin & 0x0F00) >> 8;
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log_debug("GPIO:port= %d, pin= %d\n", gpio_dsc->port, gpio_dsc->pin);
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return 0;
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}
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static int prep_gpio_ctl(struct stm32_gpio_ctl *gpio_ctl, u32 gpio_fn,
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ofnode node)
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{
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gpio_fn &= 0x00FF;
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gpio_ctl->af = 0;
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switch (gpio_fn) {
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case 0:
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gpio_ctl->mode = STM32_GPIO_MODE_IN;
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break;
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case 1 ... 16:
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gpio_ctl->mode = STM32_GPIO_MODE_AF;
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gpio_ctl->af = gpio_fn - 1;
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break;
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case 17:
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gpio_ctl->mode = STM32_GPIO_MODE_AN;
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break;
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default:
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gpio_ctl->mode = STM32_GPIO_MODE_OUT;
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break;
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}
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gpio_ctl->speed = ofnode_read_u32_default(node, "slew-rate", 0);
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if (ofnode_read_bool(node, "drive-open-drain"))
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gpio_ctl->otype = STM32_GPIO_OTYPE_OD;
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else
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gpio_ctl->otype = STM32_GPIO_OTYPE_PP;
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if (ofnode_read_bool(node, "bias-pull-up"))
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gpio_ctl->pupd = STM32_GPIO_PUPD_UP;
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else if (ofnode_read_bool(node, "bias-pull-down"))
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gpio_ctl->pupd = STM32_GPIO_PUPD_DOWN;
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else
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gpio_ctl->pupd = STM32_GPIO_PUPD_NO;
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log_debug("gpio fn= %d, slew-rate= %x, op type= %x, pull-upd is = %x\n",
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gpio_fn, gpio_ctl->speed, gpio_ctl->otype,
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gpio_ctl->pupd);
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return 0;
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}
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static int stm32_pinctrl_config(ofnode node)
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{
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u32 pin_mux[MAX_PINS_ONE_IP];
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int rv, len;
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ofnode subnode;
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/*
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* check for "pinmux" property in each subnode (e.g. pins1 and pins2 for
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* usart1) of pin controller phandle "pinctrl-0"
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* */
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ofnode_for_each_subnode(subnode, node) {
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struct stm32_gpio_dsc gpio_dsc;
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struct stm32_gpio_ctl gpio_ctl;
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int i;
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rv = ofnode_read_size(subnode, "pinmux");
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if (rv < 0)
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return rv;
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len = rv / sizeof(pin_mux[0]);
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log_debug("No of pinmux entries= %d\n", len);
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if (len > MAX_PINS_ONE_IP)
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return -EINVAL;
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rv = ofnode_read_u32_array(subnode, "pinmux", pin_mux, len);
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if (rv < 0)
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return rv;
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for (i = 0; i < len; i++) {
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struct gpio_desc desc;
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log_debug("pinmux = %x\n", *(pin_mux + i));
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prep_gpio_dsc(&gpio_dsc, *(pin_mux + i));
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prep_gpio_ctl(&gpio_ctl, *(pin_mux + i), subnode);
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rv = uclass_get_device_by_seq(UCLASS_GPIO,
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gpio_dsc.port,
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&desc.dev);
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if (rv)
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return rv;
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desc.offset = gpio_dsc.pin;
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rv = stm32_gpio_config(node, &desc, &gpio_ctl);
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log_debug("rv = %d\n\n", rv);
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if (rv)
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return rv;
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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_pinctrl_bind(struct udevice *dev)
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{
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ofnode node;
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const char *name;
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int ret;
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dev_for_each_subnode(node, dev) {
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dev_dbg(dev, "bind %s\n", ofnode_get_name(node));
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if (!ofnode_is_enabled(node))
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continue;
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ofnode_get_property(node, "gpio-controller", &ret);
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if (ret < 0)
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continue;
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/* Get the name of each gpio node */
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name = ofnode_get_name(node);
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if (!name)
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return -EINVAL;
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/* Bind each gpio node */
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ret = device_bind_driver_to_node(dev, "gpio_stm32",
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name, node, NULL);
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if (ret)
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return ret;
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dev_dbg(dev, "bind %s\n", name);
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}
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return 0;
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}
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#if CONFIG_IS_ENABLED(PINCTRL_FULL)
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static int stm32_pinctrl_set_state(struct udevice *dev, struct udevice *config)
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{
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return stm32_pinctrl_config(dev_ofnode(config));
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}
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#else /* PINCTRL_FULL */
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static int stm32_pinctrl_set_state_simple(struct udevice *dev,
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struct udevice *periph)
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{
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const fdt32_t *list;
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uint32_t phandle;
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ofnode config_node;
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int size, i, ret;
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list = ofnode_get_property(dev_ofnode(periph), "pinctrl-0", &size);
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if (!list)
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return -EINVAL;
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dev_dbg(dev, "periph->name = %s\n", periph->name);
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size /= sizeof(*list);
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for (i = 0; i < size; i++) {
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phandle = fdt32_to_cpu(*list++);
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config_node = ofnode_get_by_phandle(phandle);
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if (!ofnode_valid(config_node)) {
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dev_err(periph,
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"prop pinctrl-0 index %d invalid phandle\n", i);
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return -EINVAL;
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}
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ret = stm32_pinctrl_config(config_node);
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if (ret)
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return ret;
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}
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return 0;
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}
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#endif /* PINCTRL_FULL */
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static struct pinctrl_ops stm32_pinctrl_ops = {
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#if CONFIG_IS_ENABLED(PINCTRL_FULL)
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.set_state = stm32_pinctrl_set_state,
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#else /* PINCTRL_FULL */
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.set_state_simple = stm32_pinctrl_set_state_simple,
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#endif /* PINCTRL_FULL */
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#ifndef CONFIG_SPL_BUILD
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.get_pin_name = stm32_pinctrl_get_pin_name,
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.get_pins_count = stm32_pinctrl_get_pins_count,
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.get_pin_muxing = stm32_pinctrl_get_pin_muxing,
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#endif
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};
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static const struct udevice_id stm32_pinctrl_ids[] = {
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{ .compatible = "st,stm32f429-pinctrl" },
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{ .compatible = "st,stm32f469-pinctrl" },
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{ .compatible = "st,stm32f746-pinctrl" },
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{ .compatible = "st,stm32f769-pinctrl" },
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{ .compatible = "st,stm32h743-pinctrl" },
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{ .compatible = "st,stm32mp157-pinctrl" },
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{ .compatible = "st,stm32mp157-z-pinctrl" },
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{ .compatible = "st,stm32mp135-pinctrl" },
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{ }
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};
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U_BOOT_DRIVER(pinctrl_stm32) = {
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.name = "pinctrl_stm32",
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.id = UCLASS_PINCTRL,
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.of_match = stm32_pinctrl_ids,
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.ops = &stm32_pinctrl_ops,
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.bind = stm32_pinctrl_bind,
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.probe = stm32_pinctrl_probe,
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.priv_auto = sizeof(struct stm32_pinctrl_priv),
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};
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