drivers/ata/pata_of_platform.c

   1 /*
   2  * OF-platform PATA driver
   3  *
   4  * Copyright (c) 2007  MontaVista Software, Inc.
   5  *                     Anton Vorontsov <avorontsov@ru.mvista.com>
   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 (Version 2) as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/of_address.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/ata_platform.h>
  17 #include <linux/libata.h>
  18
  19 static int pata_of_platform_probe(struct platform_device *ofdev)
  20 {
  21         int ret;
  22         struct device_node *dn = ofdev->dev.of_node;
  23         struct resource io_res;
  24         struct resource ctl_res;
  25         struct resource *irq_res;
  26         unsigned int reg_shift = 0;
  27         int pio_mode = 0;
  28         int pio_mask;
  29         const u32 *prop;
  30
  31         ret = of_address_to_resource(dn, 0, &io_res);
  32         if (ret) {
  33                 dev_err(&ofdev->dev, "can't get IO address from "
  34                         "device tree\n");
  35                 return -EINVAL;
  36         }
  37
  38         ret = of_address_to_resource(dn, 1, &ctl_res);
  39         if (ret) {
  40                 dev_err(&ofdev->dev, "can't get CTL address from "
  41                         "device tree\n");
  42                 return -EINVAL;
  43         }
  44
  45         irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  46
  47         prop = of_get_property(dn, "reg-shift", NULL);
  48         if (prop)
  49                 reg_shift = be32_to_cpup(prop);
  50
  51         prop = of_get_property(dn, "pio-mode", NULL);
  52         if (prop) {
  53                 pio_mode = be32_to_cpup(prop);
  54                 if (pio_mode > 6) {
  55                         dev_err(&ofdev->dev, "invalid pio-mode\n");
  56                         return -EINVAL;
  57                 }
  58         } else {
  59                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  60         }
  61
  62         pio_mask = 1 << pio_mode;
  63         pio_mask |= (1 << pio_mode) - 1;
  64
  65         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  66                                      reg_shift, pio_mask);
  67 }
  68
  69 static struct of_device_id pata_of_platform_match[] = {
  70         { .compatible = "ata-generic", },
  71         { },
  72 };
  73 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  74
  75 static struct platform_driver pata_of_platform_driver = {
  76         .driver = {
  77                 .name = "pata_of_platform",
  78                 .of_match_table = pata_of_platform_match,
  79         },
  80         .probe          = pata_of_platform_probe,
  81         .remove         = ata_platform_remove_one,
  82 };
  83
  84 module_platform_driver(pata_of_platform_driver);
  85
  86 MODULE_DESCRIPTION("OF-platform PATA driver");
  87 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  88 MODULE_LICENSE("GPL");