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         if (of_device_is_compatible(dn, "electra-ide")) {
  39                 /* Altstatus is really at offset 0x3f6 from the primary window
  40                  * on electra-ide. Adjust ctl_res and io_res accordingly.
  41                  */
  42                 ctl_res = io_res;
  43                 ctl_res.start = ctl_res.start+0x3f6;
  44                 io_res.end = ctl_res.start-1;
  45         } else {
  46                 ret = of_address_to_resource(dn, 1, &ctl_res);
  47                 if (ret) {
  48                         dev_err(&ofdev->dev, "can't get CTL address from "
  49                                 "device tree\n");
  50                         return -EINVAL;
  51                 }
  52         }
  53
  54         irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  55         if (irq_res)
  56                 irq_res->flags = 0;
  57
  58         prop = of_get_property(dn, "reg-shift", NULL);
  59         if (prop)
  60                 reg_shift = be32_to_cpup(prop);
  61
  62         prop = of_get_property(dn, "pio-mode", NULL);
  63         if (prop) {
  64                 pio_mode = be32_to_cpup(prop);
  65                 if (pio_mode > 6) {
  66                         dev_err(&ofdev->dev, "invalid pio-mode\n");
  67                         return -EINVAL;
  68                 }
  69         } else {
  70                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  71         }
  72
  73         pio_mask = 1 << pio_mode;
  74         pio_mask |= (1 << pio_mode) - 1;
  75
  76         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  77                                      reg_shift, pio_mask);
  78 }
  79
  80 static struct of_device_id pata_of_platform_match[] = {
  81         { .compatible = "ata-generic", },
  82         { .compatible = "electra-ide", },
  83         {},
  84 };
  85 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  86
  87 static struct platform_driver pata_of_platform_driver = {
  88         .driver = {
  89                 .name = "pata_of_platform",
  90                 .owner = THIS_MODULE,
  91                 .of_match_table = pata_of_platform_match,
  92         },
  93         .probe          = pata_of_platform_probe,
  94         .remove         = ata_platform_remove_one,
  95 };
  96
  97 module_platform_driver(pata_of_platform_driver);
  98
  99 MODULE_DESCRIPTION("OF-platform PATA driver");
 100 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 101 MODULE_LICENSE("GPL");