[PATCH] gpio/starfive: add gpio driver and support gpio reset
Anup Patel
anup at brainfault.org
Sun Feb 26 22:44:03 PST 2023
On Thu, Feb 16, 2023 at 2:52 PM minda.chen <minda.chen at starfivetech.com> wrote:
>
> Add gpio driver and gpio reset function in Starfive
> JH7110 SOC platform.
>
> Signed-off-by: minda.chen <minda.chen at starfivetech.com>
I don't see a PATCH enabling it in defconfig.
How is this driver used in OpenSBI ?
Regards,
Anup
> ---
> lib/utils/gpio/Kconfig | 3 +
> lib/utils/gpio/fdt_gpio_starfive.c | 117 +++++++++++++++++++++++++++++
> lib/utils/gpio/objects.mk | 3 +
> platform/generic/configs/defconfig | 1 +
> 4 files changed, 124 insertions(+)
> create mode 100644 lib/utils/gpio/fdt_gpio_starfive.c
>
> diff --git a/lib/utils/gpio/Kconfig b/lib/utils/gpio/Kconfig
> index 38a9d75..1b338a6 100644
> --- a/lib/utils/gpio/Kconfig
> +++ b/lib/utils/gpio/Kconfig
> @@ -14,6 +14,9 @@ config FDT_GPIO_SIFIVE
> bool "SiFive GPIO FDT driver"
> default n
>
> +config FDT_GPIO_STARFIVE
> + bool "StarFive GPIO FDT driver"
> + default n
> endif
>
> config GPIO
> diff --git a/lib/utils/gpio/fdt_gpio_starfive.c b/lib/utils/gpio/fdt_gpio_starfive.c
> new file mode 100644
> index 0000000..18cca72
> --- /dev/null
> +++ b/lib/utils/gpio/fdt_gpio_starfive.c
> @@ -0,0 +1,117 @@
> +/*
> + * SPDX-License-Identifier: BSD-2-Clause
> + *
> + * Copyright (c) 2022 Starfive
> + *
> + * Authors:
> + * Minda.chen <Minda.chen at starfivetech.com>
> + */
> +
> +#include <sbi/riscv_io.h>
> +#include <sbi/sbi_error.h>
> +#include <sbi/sbi_console.h>
> +#include <sbi_utils/fdt/fdt_helper.h>
> +#include <sbi_utils/gpio/fdt_gpio.h>
> +
> +#define STARFIVE_GPIO_CHIP_MAX 2
> +#define STARFIVE_GPIO_PINS_DEF 64
> +#define STARFIVE_GPIO_OUTVAL 0x40
> +#define STARFIVE_GPIO_MASK 0xff
> +#define STARFIVE_GPIO_REG_SHIFT_MASK 0x3
> +#define STARFIVE_GPIO_SHIFT_BITS 0x3
> +
> +struct starfive_gpio_chip {
> + unsigned long addr;
> + struct gpio_chip chip;
> +};
> +
> +static unsigned int starfive_gpio_chip_count;
> +static struct starfive_gpio_chip starfive_gpio_chip_array[STARFIVE_GPIO_CHIP_MAX];
> +
> +static int starfive_gpio_direction_output(struct gpio_pin *gp, int value)
> +{
> + u32 val;
> + unsigned long reg_addr;
> + u32 bit_mask, shift_bits;
> + struct starfive_gpio_chip *chip =
> + container_of(gp->chip, struct starfive_gpio_chip, chip);
> +
> + /* set out en*/
> + reg_addr = chip->addr + gp->offset;
> + reg_addr &= ~(STARFIVE_GPIO_REG_SHIFT_MASK);
> +
> + val = readl((void *)(reg_addr));
> + shift_bits = (gp->offset & STARFIVE_GPIO_REG_SHIFT_MASK)
> + << STARFIVE_GPIO_SHIFT_BITS;
> + bit_mask = STARFIVE_GPIO_MASK << shift_bits;
> +
> + val = readl((void *)reg_addr);
> + val &= ~bit_mask;
> + writel(val, (void *)reg_addr);
> +
> + return 0;
> +}
> +
> +static void starfive_gpio_set(struct gpio_pin *gp, int value)
> +{
> + u32 val;
> + unsigned long reg_addr;
> + u32 bit_mask, shift_bits;
> + struct starfive_gpio_chip *chip =
> + container_of(gp->chip, struct starfive_gpio_chip, chip);
> +
> + reg_addr = chip->addr + gp->offset;
> + reg_addr &= ~(STARFIVE_GPIO_REG_SHIFT_MASK);
> +
> + shift_bits = (gp->offset & STARFIVE_GPIO_REG_SHIFT_MASK)
> + << STARFIVE_GPIO_SHIFT_BITS;
> + bit_mask = STARFIVE_GPIO_MASK << shift_bits;
> + /* set output value */
> + val = readl((void *)(reg_addr + STARFIVE_GPIO_OUTVAL));
> + val &= ~bit_mask;
> + val |= value << shift_bits;
> + writel(val, (void *)(reg_addr + STARFIVE_GPIO_OUTVAL));
> +}
> +
> +extern struct fdt_gpio fdt_gpio_starfive;
> +
> +static int starfive_gpio_init(void *fdt, int nodeoff, u32 phandle,
> + const struct fdt_match *match)
> +{
> + int rc;
> + struct starfive_gpio_chip *chip;
> + u64 addr;
> +
> + if (starfive_gpio_chip_count >= STARFIVE_GPIO_CHIP_MAX)
> + return SBI_ENOSPC;
> + chip = &starfive_gpio_chip_array[starfive_gpio_chip_count];
> +
> + rc = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
> + if (rc)
> + return rc;
> +
> + chip->addr = addr;
> + chip->chip.driver = &fdt_gpio_starfive;
> + chip->chip.id = phandle;
> + chip->chip.ngpio = STARFIVE_GPIO_PINS_DEF;
> + chip->chip.direction_output = starfive_gpio_direction_output;
> + chip->chip.set = starfive_gpio_set;
> + rc = gpio_chip_add(&chip->chip);
> + if (rc)
> + return rc;
> +
> + starfive_gpio_chip_count++;
> + return 0;
> +}
> +
> +static const struct fdt_match starfive_gpio_match[] = {
> + { .compatible = "starfive,jh7110-sys-pinctrl" },
> + { .compatible = "starfive,iomux-pinctrl" },
> + { },
> +};
> +
> +struct fdt_gpio fdt_gpio_starfive = {
> + .match_table = starfive_gpio_match,
> + .xlate = fdt_gpio_simple_xlate,
> + .init = starfive_gpio_init,
> +};
> diff --git a/lib/utils/gpio/objects.mk b/lib/utils/gpio/objects.mk
> index eedd699..8f4a6a8 100644
> --- a/lib/utils/gpio/objects.mk
> +++ b/lib/utils/gpio/objects.mk
> @@ -13,4 +13,7 @@ libsbiutils-objs-$(CONFIG_FDT_GPIO) += gpio/fdt_gpio_drivers.o
> carray-fdt_gpio_drivers-$(CONFIG_FDT_GPIO_SIFIVE) += fdt_gpio_sifive
> libsbiutils-objs-$(CONFIG_FDT_GPIO_SIFIVE) += gpio/fdt_gpio_sifive.o
>
> +carray-fdt_gpio_drivers-$(CONFIG_FDT_GPIO_STARFIVE) += fdt_gpio_starfive
> +libsbiutils-objs-$(CONFIG_FDT_GPIO_STARFIVE) += gpio/fdt_gpio_starfive.o
> +
> libsbiutils-objs-$(CONFIG_GPIO) += gpio/gpio.o
> diff --git a/platform/generic/configs/defconfig b/platform/generic/configs/defconfig
> index 4b0842e..2ad953d 100644
> --- a/platform/generic/configs/defconfig
> +++ b/platform/generic/configs/defconfig
> @@ -6,6 +6,7 @@ CONFIG_PLATFORM_SIFIVE_FU740=y
> CONFIG_PLATFORM_STARFIVE_JH7110=y
> CONFIG_FDT_GPIO=y
> CONFIG_FDT_GPIO_SIFIVE=y
> +CONFIG_FDT_GPIO_STARFIVE=y
> CONFIG_FDT_I2C=y
> CONFIG_FDT_I2C_SIFIVE=y
> CONFIG_FDT_IPI=y
> --
> 2.17.1
>
>
> --
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