drivers/gpio/gpio-iop.c

   1 /*
   2  * arch/arm/plat-iop/gpio.c
   3  * GPIO handling for Intel IOP3xx processors.
   4  *
   5  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or (at
  10  * your option) any later version.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/module.h>
  15 #include <linux/gpio/driver.h>
  16 #include <linux/platform_device.h>
  17
  18 #define IOP3XX_GPOE     0x0000
  19 #define IOP3XX_GPID     0x0004
  20 #define IOP3XX_GPOD     0x0008
  21
  22 static int iop3xx_gpio_probe(struct platform_device *pdev)
  23 {
  24         struct resource *res;
  25         struct gpio_chip *gc;
  26         void __iomem *base;
  27         int err;
  28
  29         gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  30         if (!gc)
  31                 return -ENOMEM;
  32
  33         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  34         base = devm_ioremap_resource(&pdev->dev, res);
  35         if (IS_ERR(base))
  36                 return PTR_ERR(base);
  37
  38         err = bgpio_init(gc, &pdev->dev, 1, base + IOP3XX_GPID,
  39                          base + IOP3XX_GPOD, NULL, NULL, base + IOP3XX_GPOE, 0);
  40         if (err)
  41                 return err;
  42
  43         gc->base = 0;
  44         gc->owner = THIS_MODULE;
  45
  46         return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  47 }
  48
  49 static struct platform_driver iop3xx_gpio_driver = {
  50         .driver = {
  51                 .name = "gpio-iop",
  52         },
  53         .probe = iop3xx_gpio_probe,
  54 };
  55
  56 static int __init iop3xx_gpio_init(void)
  57 {
  58         return platform_driver_register(&iop3xx_gpio_driver);
  59 }
  60 arch_initcall(iop3xx_gpio_init);