This patch adds support for the GPIO perif found on hi6220 SoC.
Signed-off-by: Peter Griffin peter.griffin@linaro.org --- arch/arm/include/asm/arch-hi6220/gpio.h | 29 ++++++++++ drivers/gpio/Makefile | 2 + drivers/gpio/hi6220_gpio.c | 95 +++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 arch/arm/include/asm/arch-hi6220/gpio.h create mode 100644 drivers/gpio/hi6220_gpio.c
diff --git a/arch/arm/include/asm/arch-hi6220/gpio.h b/arch/arm/include/asm/arch-hi6220/gpio.h new file mode 100644 index 0000000..98122a2 --- /dev/null +++ b/arch/arm/include/asm/arch-hi6220/gpio.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2015 Linaro + * Peter Griffin peter.griffin@linaro.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _HI6220_GPIO_H_ +#define _HI6220_GPIO_H_ + +#define HI6220_GPIO_BASE(bank) (((bank < 4) ? 0xf8011000 : \ + 0xf7020000 - 0x4000) + (0x1000 * bank)) + +#define BIT(x) (1 << (x)) + +#define HI6220_GPIO_PER_BANK 8 +#define HI6220_GPIO_DIR 0x400 + +struct gpio_bank { + u8 *base; /* address of registers in physical memory */ +}; + +/* Information about a GPIO bank */ +struct hikey_gpio_platdata { + int bank_index; + unsigned int base; /* address of registers in physical memory */ +}; + +#endif /* _HI6220_GPIO_H_ */ diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 5864850..b470bab 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -46,3 +46,5 @@ obj-$(CONFIG_LPC32XX_GPIO) += lpc32xx_gpio.o obj-$(CONFIG_STM32_GPIO) += stm32_gpio.o obj-$(CONFIG_ZYNQ_GPIO) += zynq_gpio.o obj-$(CONFIG_VYBRID_GPIO) += vybrid_gpio.o +obj-$(CONFIG_HIKEY_GPIO) += hi6220_gpio.o + diff --git a/drivers/gpio/hi6220_gpio.c b/drivers/gpio/hi6220_gpio.c new file mode 100644 index 0000000..3f41bff --- /dev/null +++ b/drivers/gpio/hi6220_gpio.c @@ -0,0 +1,95 @@ +/* + * Copyright (C) 2015 Linaro + * Peter Griffin peter.griffin@linaro.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <asm/gpio.h> +#include <asm/io.h> +#include <errno.h> + +static int hi6220_gpio_direction_input(struct udevice *dev, unsigned int gpio) +{ + struct gpio_bank *bank = dev_get_priv(dev); + u8 data; + + data = readb(bank->base + HI6220_GPIO_DIR); + data &= ~(1 << gpio); + writeb(data, bank->base + HI6220_GPIO_DIR); + + return 0; +} + +static int hi6220_gpio_set_value(struct udevice *dev, unsigned gpio, + int value) +{ + struct gpio_bank *bank = dev_get_priv(dev); + + writeb(!!value << gpio, bank->base + (BIT(gpio + 2))); + return 0; +} + +static int hi6220_gpio_direction_output(struct udevice *dev, unsigned gpio, + int value) +{ + struct gpio_bank *bank = dev_get_priv(dev); + u8 data; + + data = readb(bank->base + HI6220_GPIO_DIR); + data |= 1 << gpio; + writeb(data, bank->base + HI6220_GPIO_DIR); + + hi6220_gpio_set_value(dev, gpio, value); + + return 0; +} + +static int hi6220_gpio_get_value(struct udevice *dev, unsigned gpio) +{ + struct gpio_bank *bank = dev_get_priv(dev); + + return !!readb(bank->base + (BIT(gpio + 2))); +} + + + +static const struct dm_gpio_ops gpio_hi6220_ops = { + .direction_input = hi6220_gpio_direction_input, + .direction_output = hi6220_gpio_direction_output, + .get_value = hi6220_gpio_get_value, + .set_value = hi6220_gpio_set_value, +}; + +static int hi6220_gpio_probe(struct udevice *dev) +{ + struct gpio_bank *bank = dev_get_priv(dev); + struct hikey_gpio_platdata *plat = dev_get_platdata(dev); + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + char name[18], *str; + + sprintf(name, "GPIO%d_", plat->bank_index); + + str = strdup(name); + if (!str) + return -ENOMEM; + + uc_priv->bank_name = str; + uc_priv->gpio_count = HI6220_GPIO_PER_BANK; + + bank->base = (u8 *)plat->base; + + return 0; +} + +U_BOOT_DRIVER(gpio_hi6220) = { + .name = "gpio_hi6220", + .id = UCLASS_GPIO, + .ops = &gpio_hi6220_ops, + .probe = hi6220_gpio_probe, + .priv_auto_alloc_size = sizeof(struct gpio_bank), +}; + +