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