[PATCH RESEND v4 4/8] gpio: add driver for 74xx-ICs with MMIO access
Ahmad Fatoum
a.fatoum at pengutronix.de
Fri Oct 1 03:13:00 PDT 2021
On 17.08.21 12:11, Antony Pavlov wrote:
> This patch adds driver to support GPIO functionality
> for 74xx-compatible ICs with MMIO access.
>
> Compatible models include:
> 1 bit: 741G125 (Input), 741G74 (Output)
> 2 bits: 742G125 (Input), 7474 (Output)
> 4 bits: 74125 (Input), 74175 (Output)
> 6 bits: 74365 (Input), 74174 (Output)
> 8 bits: 74244 (Input), 74273 (Output)
> 16 bits: 741624 (Input), 7416374 (Output)
>
> Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
> Cc: Alexander Shiyan <shc_work at mail.ru>
Acked-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
> drivers/gpio/Kconfig | 14 +++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-74xx-mmio.c | 165 ++++++++++++++++++++++++++++++++++
> 3 files changed, 180 insertions(+)
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 98a44fbbb5..f79c9ea67d 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -21,6 +21,20 @@ config GPIO_74164
> shift registers. This driver can be used to provide access
> to more gpio outputs.
>
> +config GPIO_74XX_MMIO
> + tristate "GPIO driver for 74xx-ICs with MMIO access"
> + depends on OFDEVICE
> + select GPIO_GENERIC
> + help
> + Say yes here to support GPIO functionality for 74xx-compatible ICs
> + with MMIO access. Compatible models include:
> + 1 bit: 741G125 (Input), 741G74 (Output)
> + 2 bits: 742G125 (Input), 7474 (Output)
> + 4 bits: 74125 (Input), 74175 (Output)
> + 6 bits: 74365 (Input), 74174 (Output)
> + 8 bits: 74244 (Input), 74273 (Output)
> + 16 bits: 741624 (Input), 7416374 (Output)
> +
> config GPIO_CLPS711X
> bool "GPIO support for CLPS711X"
> depends on ARCH_CLPS711X || COMPILE_TEST
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 638cbb19a3..023973cb63 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -1,6 +1,7 @@
> obj-$(CONFIG_GPIOLIB) += gpiolib.o
>
> obj-$(CONFIG_GPIO_74164) += gpio-74164.o
> +obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
> obj-$(CONFIG_MACH_MIPS_ATH79) += gpio-ath79.o
> obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o
> obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
> diff --git a/drivers/gpio/gpio-74xx-mmio.c b/drivers/gpio/gpio-74xx-mmio.c
> new file mode 100644
> index 0000000000..5b688f4766
> --- /dev/null
> +++ b/drivers/gpio/gpio-74xx-mmio.c
> @@ -0,0 +1,165 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * 74xx MMIO GPIO driver
> + *
> + * Copyright (C) 2014 Alexander Shiyan <shc_work at mail.ru>
> + *
> + * Ported to barebox from linux-v5.4-rc6
> + * Copyright (C) 2019-2021 Antony Pavlov <antonynpavlov at gmail.com>
> + *
> + */
> +
> +#include <common.h>
> +#include <driver.h>
> +#include <errno.h>
> +#include <gpio.h>
> +#include <init.h>
> +#include <io.h>
> +#include <malloc.h>
> +#include <of_device.h>
> +
> +#include <linux/err.h>
> +#include <linux/basic_mmio_gpio.h>
> +
> +#define MMIO_74XX_DIR_IN (0 << 8)
> +#define MMIO_74XX_DIR_OUT (1 << 8)
> +#define MMIO_74XX_BIT_CNT(x) ((x) & 0xff)
> +
> +struct mmio_74xx_gpio_priv {
> + struct bgpio_chip bgc;
> + unsigned int flags;
> +};
> +
> +static const struct of_device_id mmio_74xx_gpio_ids[] = {
> + {
> + .compatible = "ti,741g125",
> + .data = (const void *)(MMIO_74XX_DIR_IN | 1),
> + },
> + {
> + .compatible = "ti,742g125",
> + .data = (const void *)(MMIO_74XX_DIR_IN | 2),
> + },
> + {
> + .compatible = "ti,74125",
> + .data = (const void *)(MMIO_74XX_DIR_IN | 4),
> + },
> + {
> + .compatible = "ti,74365",
> + .data = (const void *)(MMIO_74XX_DIR_IN | 6),
> + },
> + {
> + .compatible = "ti,74244",
> + .data = (const void *)(MMIO_74XX_DIR_IN | 8),
> + },
> + {
> + .compatible = "ti,741624",
> + .data = (const void *)(MMIO_74XX_DIR_IN | 16),
> + },
> + {
> + .compatible = "ti,741g74",
> + .data = (const void *)(MMIO_74XX_DIR_OUT | 1),
> + },
> + {
> + .compatible = "ti,7474",
> + .data = (const void *)(MMIO_74XX_DIR_OUT | 2),
> + },
> + {
> + .compatible = "ti,74175",
> + .data = (const void *)(MMIO_74XX_DIR_OUT | 4),
> + },
> + {
> + .compatible = "ti,74174",
> + .data = (const void *)(MMIO_74XX_DIR_OUT | 6),
> + },
> + {
> + .compatible = "ti,74273",
> + .data = (const void *)(MMIO_74XX_DIR_OUT | 8),
> + },
> + {
> + .compatible = "ti,7416374",
> + .data = (const void *)(MMIO_74XX_DIR_OUT | 16),
> + },
> + { }
> +};
> +
> +static inline
> +struct mmio_74xx_gpio_priv *to_mmio_74xx_gpio_priv(struct gpio_chip *gc)
> +{
> + struct bgpio_chip *bgc =
> + container_of(gc, struct bgpio_chip, gc);
> +
> + return container_of(bgc, struct mmio_74xx_gpio_priv, bgc);
> +}
> +
> +static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned int offset)
> +{
> + struct mmio_74xx_gpio_priv *priv = to_mmio_74xx_gpio_priv(gc);
> +
> + if (priv->flags & MMIO_74XX_DIR_OUT)
> + return GPIOF_DIR_OUT;
> +
> + return GPIOF_DIR_IN;
> +}
> +
> +static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
> +{
> + struct mmio_74xx_gpio_priv *priv = to_mmio_74xx_gpio_priv(gc);
> +
> + return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0;
> +}
> +
> +static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
> +{
> + struct mmio_74xx_gpio_priv *priv = to_mmio_74xx_gpio_priv(gc);
> +
> + if (priv->flags & MMIO_74XX_DIR_OUT) {
> + gc->ops->set(gc, gpio, val);
> + return 0;
> + }
> +
> + return -ENOTSUPP;
> +}
> +
> +static int mmio_74xx_gpio_probe(struct device_d *dev)
> +{
> + struct mmio_74xx_gpio_priv *priv;
> + void __iomem *dat;
> + int err;
> + struct gpio_chip *gc;
> +
> + priv = xzalloc(sizeof(*priv));
> +
> + priv->flags = (uintptr_t)of_device_get_match_data(dev);
> +
> + dat = dev_request_mem_region(dev, 0);
> + if (IS_ERR(dat))
> + return PTR_ERR(dat);
> +
> + err = bgpio_init(&priv->bgc, dev,
> + DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
> + dat, NULL, NULL, NULL, NULL, 0);
> + if (err)
> + return err;
> +
> + gc = &priv->bgc.gc;
> + gc->ops->direction_input = mmio_74xx_dir_in;
> + gc->ops->direction_output = mmio_74xx_dir_out;
> + gc->ops->get_direction = mmio_74xx_get_direction;
> + gc->ngpio = MMIO_74XX_BIT_CNT(priv->flags);
> +
> + dev->priv = priv;
> +
> + return gpiochip_add(gc);
> +}
> +
> +static struct driver_d mmio_74xx_gpio_driver = {
> + .name = "74xx-mmio-gpio",
> + .of_compatible = DRV_OF_COMPAT(mmio_74xx_gpio_ids),
> + .probe = mmio_74xx_gpio_probe,
> +};
> +
> +coredevice_platform_driver(mmio_74xx_gpio_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Alexander Shiyan <shc_work at mail.ru>");
> +MODULE_DESCRIPTION("74xx MMIO GPIO driver");
>
--
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