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_address.h>
  15#include <linux/platform_device.h>
  16#include <linux/ata_platform.h>
  17#include <linux/libata.h>
  18
  19#define DRV_NAME "pata_of_platform"
  20
  21static struct scsi_host_template pata_platform_sht = {
  22        ATA_PIO_SHT(DRV_NAME),
  23};
  24
  25static int pata_of_platform_probe(struct platform_device *ofdev)
  26{
  27        int ret;
  28        struct device_node *dn = ofdev->dev.of_node;
  29        struct resource io_res;
  30        struct resource ctl_res;
  31        struct resource *irq_res;
  32        unsigned int reg_shift = 0;
  33        int pio_mode = 0;
  34        int pio_mask;
  35        const u32 *prop;
  36
  37        ret = of_address_to_resource(dn, 0, &io_res);
  38        if (ret) {
  39                dev_err(&ofdev->dev, "can't get IO address from "
  40                        "device tree\n");
  41                return -EINVAL;
  42        }
  43
  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        irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  52
  53        prop = of_get_property(dn, "reg-shift", NULL);
  54        if (prop)
  55                reg_shift = be32_to_cpup(prop);
  56
  57        prop = of_get_property(dn, "pio-mode", NULL);
  58        if (prop) {
  59                pio_mode = be32_to_cpup(prop);
  60                if (pio_mode > 6) {
  61                        dev_err(&ofdev->dev, "invalid pio-mode\n");
  62                        return -EINVAL;
  63                }
  64        } else {
  65                dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  66        }
  67
  68        pio_mask = 1 << pio_mode;
  69        pio_mask |= (1 << pio_mode) - 1;
  70
  71        return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  72                                     reg_shift, pio_mask, &pata_platform_sht);
  73}
  74
  75static struct of_device_id pata_of_platform_match[] = {
  76        { .compatible = "ata-generic", },
  77        { },
  78};
  79MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  80
  81static struct platform_driver pata_of_platform_driver = {
  82        .driver = {
  83                .name = DRV_NAME,
  84                .of_match_table = pata_of_platform_match,
  85        },
  86        .probe          = pata_of_platform_probe,
  87        .remove         = ata_platform_remove_one,
  88};
  89
  90module_platform_driver(pata_of_platform_driver);
  91
  92MODULE_DESCRIPTION("OF-platform PATA driver");
  93MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  94MODULE_LICENSE("GPL");
  95