axp_gpio.c
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/*
* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
*
* X-Powers AXP Power Management ICs gpio driver
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/gpio.h>
#include <asm/arch/pmic_bus.h>
#include <asm/gpio.h>
#include <axp_pmic.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <errno.h>
static int axp_gpio_set_value(struct udevice *dev, unsigned pin, int val);
static u8 axp_get_gpio_ctrl_reg(unsigned pin)
{
switch (pin) {
case 0: return AXP_GPIO0_CTRL;
case 1: return AXP_GPIO1_CTRL;
#ifdef AXP_GPIO2_CTRL
case 2: return AXP_GPIO2_CTRL;
#endif
#ifdef AXP_GPIO3_CTRL
case 3: return AXP_GPIO3_CTRL;
#endif
}
return 0;
}
static int axp_gpio_direction_input(struct udevice *dev, unsigned pin)
{
u8 reg;
switch (pin) {
#ifndef CONFIG_AXP152_POWER /* NA on axp152 */
case SUNXI_GPIO_AXP0_VBUS_DETECT:
return 0;
#endif
default:
reg = axp_get_gpio_ctrl_reg(pin);
if (reg == 0)
return -EINVAL;
return pmic_bus_write(reg, AXP_GPIO_CTRL_INPUT);
}
}
static int axp_gpio_direction_output(struct udevice *dev, unsigned pin,
int val)
{
__maybe_unused int ret;
u8 reg;
switch (pin) {
#ifdef AXP_MISC_CTRL_N_VBUSEN_FUNC
/* Only available on later PMICs */
case SUNXI_GPIO_AXP0_VBUS_ENABLE:
ret = pmic_bus_clrbits(AXP_MISC_CTRL,
AXP_MISC_CTRL_N_VBUSEN_FUNC);
if (ret)
return ret;
return axp_gpio_set_value(dev, pin, val);
#endif
default:
reg = axp_get_gpio_ctrl_reg(pin);
if (reg == 0)
return -EINVAL;
return pmic_bus_write(reg, val ? AXP_GPIO_CTRL_OUTPUT_HIGH :
AXP_GPIO_CTRL_OUTPUT_LOW);
}
}
static int axp_gpio_get_value(struct udevice *dev, unsigned pin)
{
u8 reg, val, mask;
int ret;
switch (pin) {
#ifndef CONFIG_AXP152_POWER /* NA on axp152 */
case SUNXI_GPIO_AXP0_VBUS_DETECT:
ret = pmic_bus_read(AXP_POWER_STATUS, &val);
mask = AXP_POWER_STATUS_VBUS_PRESENT;
break;
#endif
#ifdef AXP_MISC_CTRL_N_VBUSEN_FUNC
/* Only available on later PMICs */
case SUNXI_GPIO_AXP0_VBUS_ENABLE:
ret = pmic_bus_read(AXP_VBUS_IPSOUT, &val);
mask = AXP_VBUS_IPSOUT_DRIVEBUS;
break;
#endif
default:
reg = axp_get_gpio_ctrl_reg(pin);
if (reg == 0)
return -EINVAL;
ret = pmic_bus_read(AXP_GPIO_STATE, &val);
mask = 1 << (pin + AXP_GPIO_STATE_OFFSET);
}
if (ret)
return ret;
return (val & mask) ? 1 : 0;
}
static int axp_gpio_set_value(struct udevice *dev, unsigned pin, int val)
{
u8 reg;
switch (pin) {
#ifdef AXP_MISC_CTRL_N_VBUSEN_FUNC
/* Only available on later PMICs */
case SUNXI_GPIO_AXP0_VBUS_ENABLE:
if (val)
return pmic_bus_setbits(AXP_VBUS_IPSOUT,
AXP_VBUS_IPSOUT_DRIVEBUS);
else
return pmic_bus_clrbits(AXP_VBUS_IPSOUT,
AXP_VBUS_IPSOUT_DRIVEBUS);
#endif
default:
reg = axp_get_gpio_ctrl_reg(pin);
if (reg == 0)
return -EINVAL;
return pmic_bus_write(reg, val ? AXP_GPIO_CTRL_OUTPUT_HIGH :
AXP_GPIO_CTRL_OUTPUT_LOW);
}
}
static const struct dm_gpio_ops gpio_axp_ops = {
.direction_input = axp_gpio_direction_input,
.direction_output = axp_gpio_direction_output,
.get_value = axp_gpio_get_value,
.set_value = axp_gpio_set_value,
};
static int gpio_axp_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
/* Tell the uclass how many GPIOs we have */
uc_priv->bank_name = strdup(SUNXI_GPIO_AXP0_PREFIX);
uc_priv->gpio_count = SUNXI_GPIO_AXP0_GPIO_COUNT;
return 0;
}
U_BOOT_DRIVER(gpio_axp) = {
.name = "gpio_axp",
.id = UCLASS_GPIO,
.ops = &gpio_axp_ops,
.probe = gpio_axp_probe,
};
int axp_gpio_init(void)
{
struct udevice *dev;
int ret;
ret = pmic_bus_init();
if (ret)
return ret;
/* There is no devicetree support for the axp yet, so bind directly */
ret = device_bind_driver(dm_root(), "gpio_axp", "AXP-gpio", &dev);
if (ret)
return ret;
return 0;
}