diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpio/gpio-74xx-mmio.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpio/gpio-74xx-mmio.c')
-rw-r--r-- | drivers/gpio/gpio-74xx-mmio.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-74xx-mmio.c b/drivers/gpio/gpio-74xx-mmio.c new file mode 100644 index 0000000000..c7ac5a9ffb --- /dev/null +++ b/drivers/gpio/gpio-74xx-mmio.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 74xx MMIO GPIO driver + * + * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru> + */ + +#include <linux/bits.h> +#include <linux/err.h> +#include <linux/gpio/driver.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/property.h> + +#define MMIO_74XX_DIR_IN BIT(8) +#define MMIO_74XX_DIR_OUT BIT(9) +#define MMIO_74XX_BIT_CNT(x) ((x) & GENMASK(7, 0)) + +struct mmio_74xx_gpio_priv { + struct gpio_chip gc; + unsigned 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), + }, + { } +}; +MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids); + +static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset) +{ + struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc); + + if (priv->flags & MMIO_74XX_DIR_OUT) + return GPIO_LINE_DIRECTION_OUT; + + return GPIO_LINE_DIRECTION_IN; +} + +static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio) +{ + struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc); + + if (priv->flags & MMIO_74XX_DIR_IN) + return 0; + + return -ENOTSUPP; +} + +static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc); + + if (priv->flags & MMIO_74XX_DIR_OUT) { + gc->set(gc, gpio, val); + return 0; + } + + return -ENOTSUPP; +} + +static int mmio_74xx_gpio_probe(struct platform_device *pdev) +{ + struct mmio_74xx_gpio_priv *priv; + void __iomem *dat; + int err; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->flags = (uintptr_t)device_get_match_data(&pdev->dev); + + dat = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dat)) + return PTR_ERR(dat); + + err = bgpio_init(&priv->gc, &pdev->dev, + DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8), + dat, NULL, NULL, NULL, NULL, 0); + if (err) + return err; + + priv->gc.direction_input = mmio_74xx_dir_in; + priv->gc.direction_output = mmio_74xx_dir_out; + priv->gc.get_direction = mmio_74xx_get_direction; + priv->gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags); + priv->gc.owner = THIS_MODULE; + + return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv); +} + +static struct platform_driver mmio_74xx_gpio_driver = { + .driver = { + .name = "74xx-mmio-gpio", + .of_match_table = mmio_74xx_gpio_ids, + }, + .probe = mmio_74xx_gpio_probe, +}; +module_platform_driver(mmio_74xx_gpio_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); +MODULE_DESCRIPTION("74xx MMIO GPIO driver"); |