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_platform.h>
  15 #include <linux/ata_platform.h>
  16
  17 static int __devinit pata_of_platform_probe(struct of_device *ofdev,
  18                                             const struct of_device_id *match)
  19 {
  20         int ret;
  21         struct device_node *dn = ofdev->node;
  22         struct resource io_res;
  23         struct resource ctl_res;
  24         struct resource irq_res;
  25         unsigned int reg_shift = 0;
  26         int pio_mode = 0;
  27         int pio_mask;
  28         const u32 *prop;
  29
  30         ret = of_address_to_resource(dn, 0, &io_res);
  31         if (ret) {
  32                 dev_err(&ofdev->dev, "can't get IO address from "
  33                         "device tree\n");
  34                 return -EINVAL;
  35         }
  36
  37         if (of_device_is_compatible(dn, "electra-ide")) {
  38                 /* Altstatus is really at offset 0x3f6 from the primary window
  39                  * on electra-ide. Adjust ctl_res and io_res accordingly.
  40                  */
  41                 ctl_res = io_res;
  42                 ctl_res.start = ctl_res.start+0x3f6;
  43                 io_res.end = ctl_res.start-1;
  44         } else {
  45                 ret = of_address_to_resource(dn, 1, &ctl_res);
  46                 if (ret) {
  47                         dev_err(&ofdev->dev, "can't get CTL address from "
  48                                 "device tree\n");
  49                         return -EINVAL;
  50                 }
  51         }
  52
  53         ret = of_irq_to_resource(dn, 0, &irq_res);
  54         if (ret == NO_IRQ)
  55                 irq_res.start = irq_res.end = -1;
  56         else
  57                 irq_res.flags = 0;
  58
  59         prop = of_get_property(dn, "reg-shift", NULL);
  60         if (prop)
  61                 reg_shift = *prop;
  62
  63         prop = of_get_property(dn, "pio-mode", NULL);
  64         if (prop) {
  65                 pio_mode = *prop;
  66                 if (pio_mode > 6) {
  67                         dev_err(&ofdev->dev, "invalid pio-mode\n");
  68                         return -EINVAL;
  69                 }
  70         } else {
  71                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  72         }
  73
  74         pio_mask = 1 << pio_mode;
  75         pio_mask |= (1 << pio_mode) - 1;
  76
  77         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res,
  78                                      reg_shift, pio_mask);
  79 }
  80
  81 static int __devexit pata_of_platform_remove(struct of_device *ofdev)
  82 {
  83         return __pata_platform_remove(&ofdev->dev);
  84 }
  85
  86 static struct of_device_id pata_of_platform_match[] = {
  87         { .compatible = "ata-generic", },
  88         { .compatible = "electra-ide", },
  89         {},
  90 };
  91 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  92
  93 static struct of_platform_driver pata_of_platform_driver = {
  94         .name           = "pata_of_platform",
  95         .match_table    = pata_of_platform_match,
  96         .probe          = pata_of_platform_probe,
  97         .remove         = __devexit_p(pata_of_platform_remove),
  98 };
  99
 100 static int __init pata_of_platform_init(void)
 101 {
 102         return of_register_platform_driver(&pata_of_platform_driver);
 103 }
 104 module_init(pata_of_platform_init);
 105
 106 static void __exit pata_of_platform_exit(void)
 107 {
 108         of_unregister_platform_driver(&pata_of_platform_driver);
 109 }
 110 module_exit(pata_of_platform_exit);
 111
 112 MODULE_DESCRIPTION("OF-platform PATA driver");
 113 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 114 MODULE_LICENSE("GPL");