linux/drivers/ide/ide_platform.c
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   1/*
   2 * Platform IDE driver
   3 *
   4 * Copyright (C) 2007 MontaVista Software
   5 *
   6 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   7 *
   8 * This program is free software; you can redistribute  it and/or modify it
   9 * under  the terms of  the GNU General  Public License as published by the
  10 * Free Software Foundation;  either version 2 of the  License, or (at your
  11 * option) any later version.
  12 */
  13
  14#include <linux/types.h>
  15#include <linux/init.h>
  16#include <linux/kernel.h>
  17#include <linux/ide.h>
  18#include <linux/ioport.h>
  19#include <linux/module.h>
  20#include <linux/ata_platform.h>
  21#include <linux/platform_device.h>
  22#include <linux/interrupt.h>
  23#include <linux/io.h>
  24
  25static void plat_ide_setup_ports(struct ide_hw *hw, void __iomem *base,
  26                                 void __iomem *ctrl,
  27                                 struct pata_platform_info *pdata, int irq)
  28{
  29        unsigned long port = (unsigned long)base;
  30        int i;
  31
  32        hw->io_ports.data_addr = port;
  33
  34        port += (1 << pdata->ioport_shift);
  35        for (i = 1; i <= 7;
  36             i++, port += (1 << pdata->ioport_shift))
  37                hw->io_ports_array[i] = port;
  38
  39        hw->io_ports.ctl_addr = (unsigned long)ctrl;
  40
  41        hw->irq = irq;
  42}
  43
  44static const struct ide_port_info platform_ide_port_info = {
  45        .host_flags             = IDE_HFLAG_NO_DMA,
  46        .chipset                = ide_generic,
  47};
  48
  49static int plat_ide_probe(struct platform_device *pdev)
  50{
  51        struct resource *res_base, *res_alt, *res_irq;
  52        void __iomem *base, *alt_base;
  53        struct pata_platform_info *pdata;
  54        struct ide_host *host;
  55        int ret = 0, mmio = 0;
  56        struct ide_hw hw, *hws[] = { &hw };
  57        struct ide_port_info d = platform_ide_port_info;
  58
  59        pdata = pdev->dev.platform_data;
  60
  61        /* get a pointer to the register memory */
  62        res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  63        res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  64
  65        if (!res_base || !res_alt) {
  66                res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  67                res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  68                if (!res_base || !res_alt) {
  69                        ret = -ENOMEM;
  70                        goto out;
  71                }
  72                mmio = 1;
  73        }
  74
  75        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  76        if (!res_irq) {
  77                ret = -EINVAL;
  78                goto out;
  79        }
  80
  81        if (mmio) {
  82                base = devm_ioremap(&pdev->dev,
  83                        res_base->start, resource_size(res_base));
  84                alt_base = devm_ioremap(&pdev->dev,
  85                        res_alt->start, resource_size(res_alt));
  86        } else {
  87                base = devm_ioport_map(&pdev->dev,
  88                        res_base->start, resource_size(res_base));
  89                alt_base = devm_ioport_map(&pdev->dev,
  90                        res_alt->start, resource_size(res_alt));
  91        }
  92
  93        memset(&hw, 0, sizeof(hw));
  94        plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
  95        hw.dev = &pdev->dev;
  96
  97        d.irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
  98        if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
  99                d.irq_flags |= IRQF_SHARED;
 100
 101        if (mmio)
 102                d.host_flags |= IDE_HFLAG_MMIO;
 103
 104        ret = ide_host_add(&d, hws, 1, &host);
 105        if (ret)
 106                goto out;
 107
 108        platform_set_drvdata(pdev, host);
 109
 110        return 0;
 111
 112out:
 113        return ret;
 114}
 115
 116static int plat_ide_remove(struct platform_device *pdev)
 117{
 118        struct ide_host *host = dev_get_drvdata(&pdev->dev);
 119
 120        ide_host_remove(host);
 121
 122        return 0;
 123}
 124
 125static struct platform_driver platform_ide_driver = {
 126        .driver = {
 127                .name = "pata_platform",
 128                .owner = THIS_MODULE,
 129        },
 130        .probe = plat_ide_probe,
 131        .remove = plat_ide_remove,
 132};
 133
 134static int __init platform_ide_init(void)
 135{
 136        return platform_driver_register(&platform_ide_driver);
 137}
 138
 139static void __exit platform_ide_exit(void)
 140{
 141        platform_driver_unregister(&platform_ide_driver);
 142}
 143
 144MODULE_DESCRIPTION("Platform IDE driver");
 145MODULE_LICENSE("GPL");
 146MODULE_ALIAS("platform:pata_platform");
 147
 148module_init(platform_ide_init);
 149module_exit(platform_ide_exit);
 150
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