linux/drivers/ata/pata_of_platform.c
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   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
  18static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
  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        irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  54        if (irq_res)
  55                irq_res->flags = 0;
  56
  57        prop = of_get_property(dn, "reg-shift", NULL);
  58        if (prop)
  59                reg_shift = be32_to_cpup(prop);
  60
  61        prop = of_get_property(dn, "pio-mode", NULL);
  62        if (prop) {
  63                pio_mode = be32_to_cpup(prop);
  64                if (pio_mode > 6) {
  65                        dev_err(&ofdev->dev, "invalid pio-mode\n");
  66                        return -EINVAL;
  67                }
  68        } else {
  69                dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  70        }
  71
  72        pio_mask = 1 << pio_mode;
  73        pio_mask |= (1 << pio_mode) - 1;
  74
  75        return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  76                                     reg_shift, pio_mask);
  77}
  78
  79static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
  80{
  81        return __pata_platform_remove(&ofdev->dev);
  82}
  83
  84static struct of_device_id pata_of_platform_match[] = {
  85        { .compatible = "ata-generic", },
  86        { .compatible = "electra-ide", },
  87        {},
  88};
  89MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  90
  91static struct platform_driver pata_of_platform_driver = {
  92        .driver = {
  93                .name = "pata_of_platform",
  94                .owner = THIS_MODULE,
  95                .of_match_table = pata_of_platform_match,
  96        },
  97        .probe          = pata_of_platform_probe,
  98        .remove         = __devexit_p(pata_of_platform_remove),
  99};
 100
 101module_platform_driver(pata_of_platform_driver);
 102
 103MODULE_DESCRIPTION("OF-platform PATA driver");
 104MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 105MODULE_LICENSE("GPL");
 106
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