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path: root/drivers/gpio/gpio-74xx-mmio.c
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Diffstat (limited to 'drivers/gpio/gpio-74xx-mmio.c')
-rw-r--r--drivers/gpio/gpio-74xx-mmio.c152
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");