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#include <linux/libata.h>
  18
  19static 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
  80static struct of_device_id pata_of_platform_match[] = {
  81        { .compatible = "ata-generic", },
  82        { .compatible = "electra-ide", },
  83        {},
  84};
  85MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  86
  87static 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
  97module_platform_driver(pata_of_platform_driver);
  98
  99MODULE_DESCRIPTION("OF-platform PATA driver");
 100MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 101MODULE_LICENSE("GPL");
 102
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