GPIO: Add driver for 74xx-ICs with MMIO access

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: Alexander Shiyan <shc_work@mail.ru>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 0959ca9b6b27b7ecea6c616c2d7e416233961d4b..cd3313436b3a1438a1902baef2047e7b0f87daa8 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -112,6 +112,20 @@ config GPIO_MAX730X
 
 comment "Memory mapped GPIO drivers:"
 
+config GPIO_74XX_MMIO
+       tristate "GPIO driver for 74xx-ICs with MMIO access"
+       depends on OF_GPIO
+       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
        tristate "CLPS711X GPIO support"
        depends on ARCH_CLPS711X || COMPILE_TEST

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index e5d346cf3b6e8a1d7cc564fe444d1941f02ffec6..4486bbd2dad7185ab2af924737d46b34c22d14ba 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_ACPI)               += gpiolib-acpi.o
 obj-$(CONFIG_GPIO_GENERIC)     += gpio-generic.o
 
 obj-$(CONFIG_GPIO_74X164)      += gpio-74x164.o
+obj-$(CONFIG_GPIO_74XX_MMIO)   += gpio-74xx-mmio.o
 obj-$(CONFIG_GPIO_ADNP)                += gpio-adnp.o
 obj-$(CONFIG_GPIO_ADP5520)     += gpio-adp5520.o
 obj-$(CONFIG_GPIO_ADP5588)     += gpio-adp5588.o

diff --git a/drivers/gpio/gpio-74xx-mmio.c b/drivers/gpio/gpio-74xx-mmio.c
new file mode 100644 (file)
index 0000000..0763655
--- /dev/null
+++ b/drivers/gpio/gpio-74xx-mmio.c
@@ -0,0 +1,170 @@
+/*
+ * 74xx MMIO GPIO driver
+ *
+ *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/basic_mmio_gpio.h>
+#include <linux/platform_device.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                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 inline struct mmio_74xx_gpio_priv *to_74xx_gpio(struct gpio_chip *gc)
+{
+       struct bgpio_chip *bgc = to_bgpio_chip(gc);
+
+       return container_of(bgc, struct mmio_74xx_gpio_priv, bgc);
+}
+
+static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
+{
+       struct mmio_74xx_gpio_priv *priv = to_74xx_gpio(gc);
+
+       return (priv->flags & MMIO_74XX_DIR_OUT) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
+}
+
+static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+       struct mmio_74xx_gpio_priv *priv = to_74xx_gpio(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_74xx_gpio(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)
+{
+       const struct of_device_id *of_id =
+               of_match_device(mmio_74xx_gpio_ids, &pdev->dev);
+       struct mmio_74xx_gpio_priv *priv;
+       struct resource *res;
+       void __iomem *dat;
+       int err;
+
+       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       dat = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(dat))
+               return PTR_ERR(dat);
+
+       priv->flags = (unsigned)of_id->data;
+
+       err = bgpio_init(&priv->bgc, &pdev->dev,
+                        DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
+                        dat, NULL, NULL, NULL, NULL, 0);
+       if (err)
+               return err;
+
+       priv->bgc.gc.direction_input = mmio_74xx_dir_in;
+       priv->bgc.gc.direction_output = mmio_74xx_dir_out;
+       priv->bgc.gc.get_direction = mmio_74xx_get_direction;
+       priv->bgc.gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
+       priv->bgc.gc.owner = THIS_MODULE;
+
+       platform_set_drvdata(pdev, priv);
+
+       return gpiochip_add(&priv->bgc.gc);
+}
+
+static int mmio_74xx_gpio_remove(struct platform_device *pdev)
+{
+       struct mmio_74xx_gpio_priv *priv = platform_get_drvdata(pdev);
+
+       return bgpio_remove(&priv->bgc);
+}
+
+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,
+       .remove = mmio_74xx_gpio_remove,
+};
+module_platform_driver(mmio_74xx_gpio_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("74xx MMIO GPIO driver");