This GPIO controller device is used on UniPhier SoCs.
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com ---
drivers/gpio/Kconfig | 6 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-uniphier.c | 186 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+) create mode 100644 drivers/gpio/gpio-uniphier.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 0c43777..1176e3f 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -36,6 +36,12 @@ config SANDBOX_GPIO_COUNT of 'anonymous' GPIOs that do not belong to any device or bank. Select a suitable value depending on your needs.
+config GPIO_UNIPHIER + bool "UniPhier GPIO" + depends on ARCH_UNIPHIER + help + Say yes here to support UniPhier GPIOs. + config VYBRID_GPIO bool "Vybrid GPIO driver" depends on DM diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 5864850..5ec4ad7 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -44,5 +44,6 @@ oby-$(CONFIG_SX151X) += sx151x.o obj-$(CONFIG_SUNXI_GPIO) += sunxi_gpio.o obj-$(CONFIG_LPC32XX_GPIO) += lpc32xx_gpio.o obj-$(CONFIG_STM32_GPIO) += stm32_gpio.o +obj-$(CONFIG_GPIO_UNIPHIER) += gpio-uniphier.o obj-$(CONFIG_ZYNQ_GPIO) += zynq_gpio.o obj-$(CONFIG_VYBRID_GPIO) += vybrid_gpio.o diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c new file mode 100644 index 0000000..8f8ea38 --- /dev/null +++ b/drivers/gpio/gpio-uniphier.c @@ -0,0 +1,186 @@ +/* + * Copyright (C) 2015 Masahiro Yamada yamada.masahiro@socionext.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <mapmem.h> +#include <linux/io.h> +#include <asm/errno.h> +#include <asm/gpio.h> +#include <dm/device.h> + +/* + * Unfortunately, the hardware specification adopts weird GPIO pin labeling. + * The ports are named as + * PORT00, PORT01, PORT02, ..., PORT07, + * PORT10, PORT11, PORT12, ..., PORT17, + * PORT20, PORT21, PORT22, ..., PORT27, + * ... + * PORT90, PORT91, PORT92, ..., PORT97, + * PORT100, PORT101, PORT102, ..., PORT107, + * ... + * + * The PORTs with 8 or 9 in the one's place are missing, i.e. the one's place + * is octal, while the other places are decimal. If we handle the port numbers + * as seen in the hardware documents, the GPIO offsets must be non-contiguous. + * It is possible to have sparse GPIO pins, but not handy for GPIO range + * mappings, register accessing, etc. + * + * To make things simpler (for driver and device tree implementation), this + * driver takes contiguously-numbered GPIO offsets. GPIO consumers should make + * sure to convert the PORT number into the one that fits in this driver. + * The conversion logic is very easy math, for example, + * PORT15 --> GPIO offset 13 (8 * 1 + 5) + * PORT123 --> GPIO offset 99 (8 * 12 + 3) + */ +#define UNIPHIER_GPIO_PORTS_PER_BANK 8 + +#define UNIPHIER_GPIO_REG_DATA 0 /* data */ +#define UNIPHIER_GPIO_REG_DIR 4 /* direction (1:in, 0:out) */ + +/* delete the following when BIT(nr) is added to include/linux/bitops.h */ +#define BIT(nr) (1UL << (nr)) + +struct uniphier_gpio_priv { + void __iomem *base; +}; + +static unsigned uniphier_gpio_bank_to_reg(unsigned bank, unsigned reg_type) +{ + unsigned reg; + + reg = (bank + 1) * 8 + reg_type; + + /* + * Unfortunately, there is a register hole at offset 0x90-0x9f. + * Add 0x10 when crossing the hole. + */ + if (reg >= 0x90) + reg += 0x10; + + return reg; +} + +static void uniphier_gpio_offset_write(struct udevice *dev, unsigned offset, + unsigned reg_type, int value) +{ + struct uniphier_gpio_priv *priv = dev_get_priv(dev); + unsigned bank = offset / UNIPHIER_GPIO_PORTS_PER_BANK; + unsigned bit = offset % UNIPHIER_GPIO_PORTS_PER_BANK; + unsigned reg; + u32 tmp; + + reg = uniphier_gpio_bank_to_reg(bank, reg_type); + + tmp = readl(priv->base + reg); + if (value) + tmp |= BIT(bit); + else + tmp &= ~BIT(bit); + writel(tmp, priv->base + reg); +} + +static int uniphier_gpio_offset_read(struct udevice *dev, unsigned offset, + unsigned reg_type) +{ + struct uniphier_gpio_priv *priv = dev_get_priv(dev); + unsigned bank = offset / UNIPHIER_GPIO_PORTS_PER_BANK; + unsigned bit = offset % UNIPHIER_GPIO_PORTS_PER_BANK; + unsigned reg; + + reg = uniphier_gpio_bank_to_reg(bank, reg_type); + + return readl(priv->base + reg) & BIT(bit) ? 1 : 0; +} + +static int uniphier_gpio_direction_input(struct udevice *dev, unsigned offset) +{ + uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DIR, 1); + + return 0; +} + +static int uniphier_gpio_direction_output(struct udevice *dev, unsigned offset, + int value) +{ + uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DATA, value); + uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DIR, 0); + + return 0; +} + +static int uniphier_gpio_get_value(struct udevice *dev, unsigned offset) +{ + return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_REG_DATA); +} + +static int uniphier_gpio_set_value(struct udevice *dev, unsigned offset, + int value) +{ + uniphier_gpio_offset_write(dev, offset, UNIPHIER_GPIO_REG_DATA, value); + + return 0; +} + +static int uniphier_gpio_get_function(struct udevice *dev, unsigned offset) +{ + return uniphier_gpio_offset_read(dev, offset, UNIPHIER_GPIO_REG_DIR) ? + GPIOF_INPUT : GPIOF_OUTPUT; +} + +static const struct dm_gpio_ops uniphier_gpio_ops = { + .direction_input = uniphier_gpio_direction_input, + .direction_output = uniphier_gpio_direction_output, + .get_value = uniphier_gpio_get_value, + .set_value = uniphier_gpio_set_value, + .get_function = uniphier_gpio_get_function, +}; + +static int uniphier_gpio_probe(struct udevice *dev) +{ + struct uniphier_gpio_priv *priv = dev_get_priv(dev); + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + DECLARE_GLOBAL_DATA_PTR; + fdt_addr_t addr; + fdt_size_t size; + + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", + &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->base = map_sysmem(addr, size); + if (!priv->base) + return -ENOMEM; + + uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "ngpio", 0); + + return 0; +} + +static int uniphier_gpio_remove(struct udevice *dev) +{ + struct uniphier_gpio_priv *priv = dev_get_priv(dev); + + unmap_sysmem(priv->base); + + return 0; +} + +static const struct udevice_id uniphier_gpio_match[] = { + { .compatible = "socionext,uniphier-gpio" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(uniphier_gpio) = { + .name = "uniphier_gpio", + .id = UCLASS_GPIO, + .of_match = uniphier_gpio_match, + .probe = uniphier_gpio_probe, + .remove = uniphier_gpio_remove, + .priv_auto_alloc_size = sizeof(struct uniphier_gpio_priv), + .ops = &uniphier_gpio_ops, +};