drivers/gpio/gpio-iop.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/plat-iop/gpio.c
   4  * GPIO handling for Intel IOP3xx processors.
   5  *
   6  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/module.h>
  11 #include <linux/gpio/driver.h>
  12 #include <linux/platform_device.h>
  13
  14 #define IOP3XX_GPOE     0x0000
  15 #define IOP3XX_GPID     0x0004
  16 #define IOP3XX_GPOD     0x0008
  17
  18 static int iop3xx_gpio_probe(struct platform_device *pdev)
  19 {
  20         struct gpio_chip *gc;
  21         void __iomem *base;
  22         int err;
  23
  24         gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  25         if (!gc)
  26                 return -ENOMEM;
  27
  28         base = devm_platform_ioremap_resource(pdev, 0);
  29         if (IS_ERR(base))
  30                 return PTR_ERR(base);
  31
  32         err = bgpio_init(gc, &pdev->dev, 1, base + IOP3XX_GPID,
  33                          base + IOP3XX_GPOD, NULL, NULL, base + IOP3XX_GPOE, 0);
  34         if (err)
  35                 return err;
  36
  37         gc->base = 0;
  38         gc->owner = THIS_MODULE;
  39         gc->label = "gpio-iop";
  40
  41         return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  42 }
  43
  44 static struct platform_driver iop3xx_gpio_driver = {
  45         .driver = {
  46                 .name = "gpio-iop",
  47         },
  48         .probe = iop3xx_gpio_probe,
  49 };
  50
  51 static int __init iop3xx_gpio_init(void)
  52 {
  53         return platform_driver_register(&iop3xx_gpio_driver);
  54 }
  55 arch_initcall(iop3xx_gpio_init);
  56
  57 MODULE_DESCRIPTION("GPIO handling for Intel IOP3xx processors");
  58 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
  59 MODULE_LICENSE("GPL");