diff options
Diffstat (limited to 'drivers/gpio/axp_gpio.c')
| -rw-r--r-- | drivers/gpio/axp_gpio.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/gpio/axp_gpio.c b/drivers/gpio/axp_gpio.c new file mode 100644 index 0000000..2e97cc3 --- /dev/null +++ b/drivers/gpio/axp_gpio.c @@ -0,0 +1,186 @@ +/* + * (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 <dm.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/root.h> +#include <errno.h> + +#ifdef CONFIG_AXP152_POWER +#include <axp152.h> +#elif defined CONFIG_AXP209_POWER +#include <axp209.h> +#elif defined CONFIG_AXP221_POWER +#include <axp221.h> +#else +#error Unknown AXP model +#endif + +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 CONFIG_AXP221_POWER /* Only available on axp221/axp223 */ + case SUNXI_GPIO_AXP0_VBUS_ENABLE: + ret = pmic_bus_clrbits(AXP221_MISC_CTRL, + AXP221_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 CONFIG_AXP221_POWER /* Only available on axp221/axp223 */ + case SUNXI_GPIO_AXP0_VBUS_ENABLE: + ret = pmic_bus_read(AXP221_VBUS_IPSOUT, &val); + mask = AXP221_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 CONFIG_AXP221_POWER /* Only available on axp221/axp223 */ + case SUNXI_GPIO_AXP0_VBUS_ENABLE: + if (val) + return pmic_bus_setbits(AXP221_VBUS_IPSOUT, + AXP221_VBUS_IPSOUT_DRIVEBUS); + else + return pmic_bus_clrbits(AXP221_VBUS_IPSOUT, + AXP221_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; +} |