u-boot/drivers/gpio/axp_gpio.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

179 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
*
* X-Powers AXP Power Management ICs gpio driver
*/
#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;
}