diff options
author | Simon Glass <sjg@chromium.org> | 2019-12-06 21:42:54 -0700 |
---|---|---|
committer | Bin Meng <bmeng.cn@gmail.com> | 2019-12-15 11:44:25 +0800 |
commit | 7e589bc19b4e9becd5bf825cd072abf1980fff91 (patch) | |
tree | b90bb29e5f6544674ee4ff809814090d15c3ef80 /drivers/gpio | |
parent | 74749f1e84dfec4ba521d741db461803d465948c (diff) | |
download | u-boot-7e589bc19b4e9becd5bf825cd072abf1980fff91.zip u-boot-7e589bc19b4e9becd5bf825cd072abf1980fff91.tar.gz u-boot-7e589bc19b4e9becd5bf825cd072abf1980fff91.tar.bz2 |
x86: Add a generic Intel GPIO driver
Add a GPIO driver which uses the pinctrl driver to access the pad
information. This driver relies on the GPIO nodes being subnodes to the
pinctrl device.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/gpio')
-rw-r--r-- | drivers/gpio/Kconfig | 9 | ||||
-rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
-rw-r--r-- | drivers/gpio/intel_gpio.c | 161 |
3 files changed, 171 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 447cf04..1de6f52 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -104,6 +104,15 @@ config INTEL_BROADWELL_GPIO driver from the common Intel ICH6 driver. It supports a total of 95 GPIOs which can be configured from the device tree. +config INTEL_GPIO + bool "Intel generic GPIO driver" + depends on DM_GPIO + help + Say yes here to select Intel generic GPIO driver. This controller + supports recent chips (e.g. Apollo Lake). It permits basic GPIO + control including setting pins to input/output. It makes use of its + parent pinctrl driver to actually effect changes. + config INTEL_ICH6_GPIO bool "Intel ICH6 compatible legacy GPIO driver" depends on DM_GPIO diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 3612e66..449046b 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -17,6 +17,7 @@ endif obj-$(CONFIG_AT91_GPIO) += at91_gpio.o obj-$(CONFIG_ATMEL_PIO4) += atmel_pio4.o obj-$(CONFIG_BCM6345_GPIO) += bcm6345_gpio.o +obj-$(CONFIG_INTEL_GPIO) += intel_gpio.o obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o diff --git a/drivers/gpio/intel_gpio.c b/drivers/gpio/intel_gpio.c new file mode 100644 index 0000000..4bf1c9d --- /dev/null +++ b/drivers/gpio/intel_gpio.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2019 Google LLC + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <fdtdec.h> +#include <p2sb.h> +#include <pch.h> +#include <pci.h> +#include <syscon.h> +#include <asm/cpu.h> +#include <asm/gpio.h> +#include <asm/intel_pinctrl.h> +#include <asm/intel_pinctrl_defs.h> +#include <asm/io.h> +#include <asm/pci.h> +#include <asm/arch/gpio.h> +#include <dt-bindings/gpio/x86-gpio.h> + +static int intel_gpio_direction_input(struct udevice *dev, uint offset) +{ + struct udevice *pinctrl = dev_get_parent(dev); + uint config_offset = intel_pinctrl_get_config_reg_addr(pinctrl, offset); + + pcr_clrsetbits32(pinctrl, config_offset, + PAD_CFG0_MODE_MASK | PAD_CFG0_TX_STATE | + PAD_CFG0_RX_DISABLE, + PAD_CFG0_MODE_GPIO | PAD_CFG0_TX_DISABLE); + + return 0; +} + +static int intel_gpio_direction_output(struct udevice *dev, uint offset, + int value) +{ + struct udevice *pinctrl = dev_get_parent(dev); + uint config_offset = intel_pinctrl_get_config_reg_addr(pinctrl, offset); + + pcr_clrsetbits32(dev, config_offset, + PAD_CFG0_MODE_MASK | PAD_CFG0_RX_STATE | + PAD_CFG0_TX_DISABLE, + PAD_CFG0_MODE_GPIO | PAD_CFG0_RX_DISABLE | + (value ? PAD_CFG0_TX_STATE : 0)); + + return 0; +} + +static int intel_gpio_get_value(struct udevice *dev, uint offset) +{ + struct udevice *pinctrl = dev_get_parent(dev); + uint mode, rx_tx; + u32 reg; + + reg = intel_pinctrl_get_config_reg(pinctrl, offset); + mode = (reg & PAD_CFG0_MODE_MASK) >> PAD_CFG0_MODE_SHIFT; + if (!mode) { + rx_tx = reg & (PAD_CFG0_TX_DISABLE | PAD_CFG0_RX_DISABLE); + if (rx_tx == PAD_CFG0_TX_DISABLE) + return mode & PAD_CFG0_RX_STATE_BIT ? 1 : 0; + else if (rx_tx == PAD_CFG0_RX_DISABLE) + return mode & PAD_CFG0_TX_STATE_BIT ? 1 : 0; + } + + return 0; +} + +static int intel_gpio_set_value(struct udevice *dev, unsigned offset, int value) +{ + struct udevice *pinctrl = dev_get_parent(dev); + uint config_offset = intel_pinctrl_get_config_reg_addr(pinctrl, offset); + + pcr_clrsetbits32(dev, config_offset, PAD_CFG0_TX_STATE, + value ? PAD_CFG0_TX_STATE : 0); + + return 0; +} + +static int intel_gpio_get_function(struct udevice *dev, uint offset) +{ + struct udevice *pinctrl = dev_get_parent(dev); + uint mode, rx_tx; + u32 reg; + + reg = intel_pinctrl_get_config_reg(pinctrl, offset); + mode = (reg & PAD_CFG0_MODE_MASK) >> PAD_CFG0_MODE_SHIFT; + if (!mode) { + rx_tx = reg & (PAD_CFG0_TX_DISABLE | PAD_CFG0_RX_DISABLE); + if (rx_tx == PAD_CFG0_TX_DISABLE) + return GPIOF_INPUT; + else if (rx_tx == PAD_CFG0_RX_DISABLE) + return GPIOF_OUTPUT; + } + + return GPIOF_FUNC; +} + +static int intel_gpio_xlate(struct udevice *orig_dev, struct gpio_desc *desc, + struct ofnode_phandle_args *args) +{ + struct udevice *pinctrl, *dev; + int gpio, ret; + + /* + * GPIO numbers are global in the device tree so it doesn't matter + * which one is used + */ + gpio = args->args[0]; + ret = intel_pinctrl_get_pad(gpio, &pinctrl, &desc->offset); + if (ret) + return log_msg_ret("bad", ret); + device_find_first_child(pinctrl, &dev); + if (!dev) + return log_msg_ret("no child", -ENOENT); + desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0; + desc->dev = dev; + + return 0; +} + +static int intel_gpio_probe(struct udevice *dev) +{ + return 0; +} + +static int intel_gpio_ofdata_to_platdata(struct udevice *dev) +{ + struct gpio_dev_priv *upriv = dev_get_uclass_priv(dev); + struct intel_pinctrl_priv *pinctrl_priv = dev_get_priv(dev->parent); + const struct pad_community *comm = pinctrl_priv->comm; + + upriv->gpio_count = comm->last_pad - comm->first_pad + 1; + upriv->bank_name = dev->name; + + return 0; +} + +static const struct dm_gpio_ops gpio_intel_ops = { + .direction_input = intel_gpio_direction_input, + .direction_output = intel_gpio_direction_output, + .get_value = intel_gpio_get_value, + .set_value = intel_gpio_set_value, + .get_function = intel_gpio_get_function, + .xlate = intel_gpio_xlate, +}; + +static const struct udevice_id intel_intel_gpio_ids[] = { + { .compatible = "intel,gpio" }, + { } +}; + +U_BOOT_DRIVER(gpio_intel) = { + .name = "gpio_intel", + .id = UCLASS_GPIO, + .of_match = intel_intel_gpio_ids, + .ops = &gpio_intel_ops, + .ofdata_to_platdata = intel_gpio_ofdata_to_platdata, + .probe = intel_gpio_probe, +}; |