intel_gpio.c
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// 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(pinctrl, config_offset,
PAD_CFG0_MODE_MASK | PAD_CFG0_RX_STATE |
PAD_CFG0_TX_DISABLE | PAD_CFG0_TX_STATE,
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 reg & PAD_CFG0_RX_STATE ? 1 : 0;
else if (rx_tx == PAD_CFG0_RX_DISABLE)
return reg & PAD_CFG0_TX_STATE ? 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(pinctrl, 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,
};