pinctrl: Add STMFX GPIO expander Pinctrl/GPIO driver
This patch adds pinctrl/GPIO driver for STMicroelectronics Multi-Function eXpander (STMFX) GPIO expander. STMFX is an I2C slave controller, offering up to 24 GPIOs. The driver relies on UCLASS_PINCTRL and UCLASS_GPIO. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay
parent
77457fa94e
commit
8262435dd2
@ -209,6 +209,25 @@ config PINCTRL_STM32
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the GPIO definitions and pin control functions for each available
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multiplex function.
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config PINCTRL_STMFX
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bool "STMicroelectronics STMFX I2C GPIO expander pinctrl driver"
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depends on DM && PINCTRL_FULL
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help
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I2C driver for STMicroelectronics Multi-Function eXpander (STMFX)
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GPIO expander.
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Supports pin multiplexing control on stm32 SoCs.
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The driver is controlled by a device tree node which contains both
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the GPIO definitions and pin control functions for each available
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multiplex function.
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config SPL_PINCTRL_STMFX
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bool "STMicroelectronics STMFX I2C GPIO expander pinctrl driver in SPL"
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depends on SPL_PINCTRL_FULL
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help
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This option is an SPL-variant of the SPL_PINCTRL_STMFX option.
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See the help of PINCTRL_STMFX for details.
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config ASPEED_AST2500_PINCTRL
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bool "Aspeed AST2500 pin control driver"
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depends on DM && PINCTRL_GENERIC && ASPEED_AST2500
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@ -22,4 +22,5 @@ obj-$(CONFIG_ARCH_MVEBU) += mvebu/
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obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
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obj-$(CONFIG_PINCTRL_STI) += pinctrl-sti.o
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obj-$(CONFIG_PINCTRL_STM32) += pinctrl_stm32.o
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obj-$(CONFIG_$(SPL_)PINCTRL_STMFX) += pinctrl-stmfx.o
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obj-y += broadcom/
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431
drivers/pinctrl/pinctrl-stmfx.c
Normal file
431
drivers/pinctrl/pinctrl-stmfx.c
Normal file
@ -0,0 +1,431 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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*
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* Driver for STMicroelectronics Multi-Function eXpander (STMFX) GPIO expander
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* based on Linux driver : pinctrl/pinctrl-stmfx.c
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <asm/gpio.h>
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#include <dm/device.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/pinctrl.h>
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#include <linux/bitfield.h>
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#include <power/regulator.h>
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/* STMFX pins = GPIO[15:0] + aGPIO[7:0] */
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#define STMFX_MAX_GPIO 16
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#define STMFX_MAX_AGPIO 8
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/* General */
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#define STMFX_REG_CHIP_ID 0x00 /* R */
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#define STMFX_REG_FW_VERSION_MSB 0x01 /* R */
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#define STMFX_REG_FW_VERSION_LSB 0x02 /* R */
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#define STMFX_REG_SYS_CTRL 0x40 /* RW */
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/* MFX boot time is around 10ms, so after reset, we have to wait this delay */
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#define STMFX_BOOT_TIME_MS 10
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/* GPIOs expander */
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/* GPIO_STATE1 0x10, GPIO_STATE2 0x11, GPIO_STATE3 0x12 */
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#define STMFX_REG_GPIO_STATE 0x10 /* R */
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/* GPIO_DIR1 0x60, GPIO_DIR2 0x61, GPIO_DIR3 0x63 */
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#define STMFX_REG_GPIO_DIR 0x60 /* RW */
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/* GPIO_TYPE1 0x64, GPIO_TYPE2 0x65, GPIO_TYPE3 0x66 */
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#define STMFX_REG_GPIO_TYPE 0x64 /* RW */
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/* GPIO_PUPD1 0x68, GPIO_PUPD2 0x69, GPIO_PUPD3 0x6A */
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#define STMFX_REG_GPIO_PUPD 0x68 /* RW */
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/* GPO_SET1 0x6C, GPO_SET2 0x6D, GPO_SET3 0x6E */
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#define STMFX_REG_GPO_SET 0x6C /* RW */
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/* GPO_CLR1 0x70, GPO_CLR2 0x71, GPO_CLR3 0x72 */
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#define STMFX_REG_GPO_CLR 0x70 /* RW */
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/* STMFX_REG_CHIP_ID bitfields */
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#define STMFX_REG_CHIP_ID_MASK GENMASK(7, 0)
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/* STMFX_REG_SYS_CTRL bitfields */
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#define STMFX_REG_SYS_CTRL_GPIO_EN BIT(0)
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#define STMFX_REG_SYS_CTRL_ALTGPIO_EN BIT(3)
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#define STMFX_REG_SYS_CTRL_SWRST BIT(7)
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#define NR_GPIO_REGS 3
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#define NR_GPIOS_PER_REG 8
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#define get_reg(offset) ((offset) / NR_GPIOS_PER_REG)
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#define get_shift(offset) ((offset) % NR_GPIOS_PER_REG)
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#define get_mask(offset) (BIT(get_shift(offset)))
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struct stmfx_pinctrl {
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struct udevice *gpio;
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};
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static int stmfx_read(struct udevice *dev, uint offset)
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{
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return dm_i2c_reg_read(dev_get_parent(dev), offset);
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}
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static int stmfx_write(struct udevice *dev, uint offset, unsigned int val)
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{
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return dm_i2c_reg_write(dev_get_parent(dev), offset, val);
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}
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static int stmfx_gpio_get(struct udevice *dev, unsigned int offset)
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{
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u32 reg = STMFX_REG_GPIO_STATE + get_reg(offset);
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u32 mask = get_mask(offset);
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int ret;
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ret = stmfx_read(dev, reg);
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return ret < 0 ? ret : !!(ret & mask);
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}
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static int stmfx_gpio_set(struct udevice *dev, unsigned int offset, int value)
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{
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u32 reg = value ? STMFX_REG_GPO_SET : STMFX_REG_GPO_CLR;
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u32 mask = get_mask(offset);
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return stmfx_write(dev, reg + get_reg(offset), mask);
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}
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static int stmfx_gpio_get_function(struct udevice *dev, unsigned int offset)
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{
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u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
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u32 mask = get_mask(offset);
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int ret;
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ret = stmfx_read(dev, reg);
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if (ret < 0)
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return ret;
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/* On stmfx, gpio pins direction is (0)input, (1)output. */
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return ret & mask ? GPIOF_OUTPUT : GPIOF_INPUT;
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}
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static int stmfx_gpio_direction_input(struct udevice *dev, unsigned int offset)
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{
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u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
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u32 mask = get_mask(offset);
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int ret;
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ret = stmfx_read(dev, reg);
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if (ret < 0)
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return ret;
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ret &= ~mask;
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return stmfx_write(dev, reg, ret & ~mask);
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}
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static int stmfx_gpio_direction_output(struct udevice *dev,
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unsigned int offset, int value)
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{
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u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
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u32 mask = get_mask(offset);
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int ret;
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ret = stmfx_gpio_set(dev, offset, value);
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if (ret < 0)
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return ret;
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ret = stmfx_read(dev, reg);
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if (ret < 0)
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return ret;
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return stmfx_write(dev, reg, ret | mask);
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}
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static int stmfx_gpio_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct ofnode_phandle_args args;
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u8 sys_ctrl;
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uc_priv->bank_name = "stmfx";
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uc_priv->gpio_count = STMFX_MAX_GPIO + STMFX_MAX_AGPIO;
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if (!dev_read_phandle_with_args(dev, "gpio-ranges",
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NULL, 3, 0, &args)) {
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uc_priv->gpio_count = args.args[2];
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}
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/* enable GPIO function */
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sys_ctrl = STMFX_REG_SYS_CTRL_GPIO_EN;
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if (uc_priv->gpio_count > STMFX_MAX_GPIO)
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sys_ctrl |= STMFX_REG_SYS_CTRL_ALTGPIO_EN;
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stmfx_write(dev, STMFX_REG_SYS_CTRL, sys_ctrl);
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return 0;
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}
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static const struct dm_gpio_ops stmfx_gpio_ops = {
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.set_value = stmfx_gpio_set,
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.get_value = stmfx_gpio_get,
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.get_function = stmfx_gpio_get_function,
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.direction_input = stmfx_gpio_direction_input,
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.direction_output = stmfx_gpio_direction_output,
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};
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U_BOOT_DRIVER(stmfx_gpio) = {
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.name = "stmfx-gpio",
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.id = UCLASS_GPIO,
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.probe = stmfx_gpio_probe,
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.ops = &stmfx_gpio_ops,
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};
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#if CONFIG_IS_ENABLED(PINCONF)
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static const struct pinconf_param stmfx_pinctrl_conf_params[] = {
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{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
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{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 0 },
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{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 0 },
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{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 0 },
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{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
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{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
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{ "output-high", PIN_CONFIG_OUTPUT, 1 },
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{ "output-low", PIN_CONFIG_OUTPUT, 0 },
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};
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static int stmfx_pinctrl_set_pupd(struct udevice *dev,
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unsigned int pin, u32 pupd)
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{
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u8 reg = STMFX_REG_GPIO_PUPD + get_reg(pin);
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u32 mask = get_mask(pin);
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int ret;
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ret = stmfx_read(dev, reg);
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if (ret < 0)
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return ret;
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ret = (ret & ~mask) | (pupd ? mask : 0);
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return stmfx_write(dev, reg, ret);
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}
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static int stmfx_pinctrl_set_type(struct udevice *dev,
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unsigned int pin, u32 type)
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{
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u8 reg = STMFX_REG_GPIO_TYPE + get_reg(pin);
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u32 mask = get_mask(pin);
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int ret;
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ret = stmfx_read(dev, reg);
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if (ret < 0)
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return ret;
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ret = (ret & ~mask) | (type ? mask : 0);
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return stmfx_write(dev, reg, ret);
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}
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static int stmfx_pinctrl_conf_set(struct udevice *dev, unsigned int pin,
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unsigned int param, unsigned int arg)
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{
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int ret, dir;
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struct stmfx_pinctrl *plat = dev_get_platdata(dev);
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dir = stmfx_gpio_get_function(plat->gpio, pin);
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if (dir < 0)
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return dir;
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switch (param) {
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case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
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case PIN_CONFIG_BIAS_DISABLE:
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case PIN_CONFIG_BIAS_PULL_DOWN:
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ret = stmfx_pinctrl_set_pupd(dev, pin, 0);
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break;
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case PIN_CONFIG_BIAS_PULL_UP:
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ret = stmfx_pinctrl_set_pupd(dev, pin, 1);
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break;
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case PIN_CONFIG_DRIVE_OPEN_DRAIN:
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if (dir == GPIOF_OUTPUT)
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ret = stmfx_pinctrl_set_type(dev, pin, 1);
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else
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ret = stmfx_pinctrl_set_type(dev, pin, 0);
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break;
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case PIN_CONFIG_DRIVE_PUSH_PULL:
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if (dir == GPIOF_OUTPUT)
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ret = stmfx_pinctrl_set_type(dev, pin, 0);
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else
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ret = stmfx_pinctrl_set_type(dev, pin, 1);
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break;
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case PIN_CONFIG_OUTPUT:
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ret = stmfx_gpio_direction_output(plat->gpio, pin, arg);
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break;
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default:
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return -ENOTSUPP;
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}
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return ret;
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}
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#endif
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static int stmfx_pinctrl_get_pins_count(struct udevice *dev)
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{
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struct stmfx_pinctrl *plat = dev_get_platdata(dev);
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struct gpio_dev_priv *uc_priv;
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uc_priv = dev_get_uclass_priv(plat->gpio);
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return uc_priv->gpio_count;
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}
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/*
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* STMFX pins[15:0] are called "gpio[15:0]"
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* and STMFX pins[23:16] are called "agpio[7:0]"
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*/
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#define MAX_PIN_NAME_LEN 7
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static char pin_name[MAX_PIN_NAME_LEN];
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static const char *stmfx_pinctrl_get_pin_name(struct udevice *dev,
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unsigned int selector)
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{
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if (selector < STMFX_MAX_GPIO)
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snprintf(pin_name, MAX_PIN_NAME_LEN, "gpio%u", selector);
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else
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snprintf(pin_name, MAX_PIN_NAME_LEN, "agpio%u", selector - 16);
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return pin_name;
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}
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static int stmfx_pinctrl_get_pin_muxing(struct udevice *dev,
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unsigned int selector,
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char *buf, int size)
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{
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struct stmfx_pinctrl *plat = dev_get_platdata(dev);
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int func;
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func = stmfx_gpio_get_function(plat->gpio, selector);
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if (func < 0)
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return func;
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snprintf(buf, size, "%s", func == GPIOF_INPUT ? "input" : "output");
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return 0;
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}
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static int stmfx_pinctrl_bind(struct udevice *dev)
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{
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struct stmfx_pinctrl *plat = dev_get_platdata(dev);
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return device_bind_driver_to_node(dev->parent,
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"stmfx-gpio", "stmfx-gpio",
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dev_ofnode(dev), &plat->gpio);
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};
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static int stmfx_pinctrl_probe(struct udevice *dev)
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{
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struct stmfx_pinctrl *plat = dev_get_platdata(dev);
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return device_probe(plat->gpio);
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};
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const struct pinctrl_ops stmfx_pinctrl_ops = {
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.get_pins_count = stmfx_pinctrl_get_pins_count,
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.get_pin_name = stmfx_pinctrl_get_pin_name,
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.set_state = pinctrl_generic_set_state,
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.get_pin_muxing = stmfx_pinctrl_get_pin_muxing,
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#if CONFIG_IS_ENABLED(PINCONF)
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.pinconf_set = stmfx_pinctrl_conf_set,
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.pinconf_num_params = ARRAY_SIZE(stmfx_pinctrl_conf_params),
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.pinconf_params = stmfx_pinctrl_conf_params,
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#endif
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};
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static const struct udevice_id stmfx_pinctrl_match[] = {
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{ .compatible = "st,stmfx-0300-pinctrl", },
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};
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U_BOOT_DRIVER(stmfx_pinctrl) = {
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.name = "stmfx-pinctrl",
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.id = UCLASS_PINCTRL,
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.of_match = of_match_ptr(stmfx_pinctrl_match),
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.bind = stmfx_pinctrl_bind,
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.probe = stmfx_pinctrl_probe,
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.ops = &stmfx_pinctrl_ops,
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.platdata_auto_alloc_size = sizeof(struct stmfx_pinctrl),
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};
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static int stmfx_chip_init(struct udevice *dev)
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{
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u8 id;
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u8 version[2];
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int ret;
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struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
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id = dm_i2c_reg_read(dev, STMFX_REG_CHIP_ID);
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if (id < 0) {
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dev_err(dev, "error reading chip id: %d\n", id);
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return ret;
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}
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/*
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* Check that ID is the complement of the I2C address:
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* STMFX I2C address follows the 7-bit format (MSB), that's why
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* client->addr is shifted.
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*
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* STMFX_I2C_ADDR| STMFX | Linux
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* input pin | I2C device address | I2C device address
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*---------------------------------------------------------
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* 0 | b: 1000 010x h:0x84 | 0x42
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* 1 | b: 1000 011x h:0x86 | 0x43
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*/
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if (FIELD_GET(STMFX_REG_CHIP_ID_MASK, ~id) != (chip->chip_addr << 1)) {
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dev_err(dev, "unknown chip id: %#x\n", id);
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return -EINVAL;
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}
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ret = dm_i2c_read(dev, STMFX_REG_FW_VERSION_MSB,
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version, sizeof(version));
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if (ret) {
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dev_err(dev, "error reading fw version: %d\n", ret);
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return ret;
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}
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dev_info(dev, "STMFX id: %#x, fw version: %x.%02x\n",
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id, version[0], version[1]);
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ret = dm_i2c_reg_read(dev, STMFX_REG_SYS_CTRL);
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if (ret < 0)
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return ret;
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ret = dm_i2c_reg_write(dev, STMFX_REG_SYS_CTRL,
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ret | STMFX_REG_SYS_CTRL_SWRST);
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if (ret)
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return ret;
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mdelay(STMFX_BOOT_TIME_MS);
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return ret;
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}
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|
||||
static int stmfx_probe(struct udevice *dev)
|
||||
{
|
||||
struct udevice *vdd;
|
||||
int ret;
|
||||
|
||||
ret = device_get_supply_regulator(dev, "vdd-supply", &vdd);
|
||||
if (ret && ret != -ENOENT) {
|
||||
dev_err(dev, "vdd regulator error:%d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
if (!ret) {
|
||||
ret = regulator_set_enable(vdd, true);
|
||||
if (ret) {
|
||||
dev_err(dev, "vdd enable failed: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return stmfx_chip_init(dev);
|
||||
}
|
||||
|
||||
static const struct udevice_id stmfx_match[] = {
|
||||
{ .compatible = "st,stmfx-0300", },
|
||||
};
|
||||
|
||||
U_BOOT_DRIVER(stmfx) = {
|
||||
.name = "stmfx",
|
||||
.id = UCLASS_I2C_GENERIC,
|
||||
.of_match = of_match_ptr(stmfx_match),
|
||||
.probe = stmfx_probe,
|
||||
.bind = dm_scan_fdt_dev,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user