LXR linux/drivers/ata/pata_of

   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
  17static int __devinit pata_of_platform_probe(struct platform_device *ofdev,
  18                                            const struct of_device_id *match)
  19{
  20        int ret;
  21        struct device_node *dn = ofdev->dev.of_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 = 0;
  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
  81static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
  82{
  83        return __pata_platform_remove(&ofdev->dev);
  84}
  85
  86static struct of_device_id pata_of_platform_match[] = {
  87        { .compatible = "ata-generic", },
  88        { .compatible = "electra-ide", },
  89        {},
  90};
  91MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  92
  93static struct of_platform_driver pata_of_platform_driver = {
  94        .driver = {
  95                .name = "pata_of_platform",
  96                .owner = THIS_MODULE,
  97                .of_match_table = pata_of_platform_match,
  98        },
  99        .probe          = pata_of_platform_probe,
 100        .remove         = __devexit_p(pata_of_platform_remove),
 101};
 102
 103static int __init pata_of_platform_init(void)
 104{
 105        return of_register_platform_driver(&pata_of_platform_driver);
 106}
 107module_init(pata_of_platform_init);
 108
 109static void __exit pata_of_platform_exit(void)
 110{
 111        of_unregister_platform_driver(&pata_of_platform_driver);
 112}
 113module_exit(pata_of_platform_exit);
 114
 115MODULE_DESCRIPTION("OF-platform PATA driver");
 116MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 117MODULE_LICENSE("GPL");
 118