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 __devinit plat_ide_setup_ports(struct ide_hw *hw,
  26                                           void __iomem *base,
  27                                           void __iomem *ctrl,
  28                                           struct pata_platform_info *pdata,
  29                                           int irq)
  30{
  31        unsigned long port = (unsigned long)base;
  32        int i;
  33
  34        hw->io_ports.data_addr = port;
  35
  36        port += (1 << pdata->ioport_shift);
  37        for (i = 1; i <= 7;
  38             i++, port += (1 << pdata->ioport_shift))
  39                hw->io_ports_array[i] = port;
  40
  41        hw->io_ports.ctl_addr = (unsigned long)ctrl;
  42
  43        hw->irq = irq;
  44}
  45
  46static const struct ide_port_info platform_ide_port_info = {
  47        .host_flags             = IDE_HFLAG_NO_DMA,
  48        .chipset                = ide_generic,
  49};
  50
  51static int __devinit plat_ide_probe(struct platform_device *pdev)
  52{
  53        struct resource *res_base, *res_alt, *res_irq;
  54        void __iomem *base, *alt_base;
  55        struct pata_platform_info *pdata;
  56        struct ide_host *host;
  57        int ret = 0, mmio = 0;
  58        struct ide_hw hw, *hws[] = { &hw };
  59        struct ide_port_info d = platform_ide_port_info;
  60
  61        pdata = pdev->dev.platform_data;
  62
  63        /* get a pointer to the register memory */
  64        res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  65        res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  66
  67        if (!res_base || !res_alt) {
  68                res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  69                res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  70                if (!res_base || !res_alt) {
  71                        ret = -ENOMEM;
  72                        goto out;
  73                }
  74                mmio = 1;
  75        }
  76
  77        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  78        if (!res_irq) {
  79                ret = -EINVAL;
  80                goto out;
  81        }
  82
  83        if (mmio) {
  84                base = devm_ioremap(&pdev->dev,
  85                        res_base->start, resource_size(res_base));
  86                alt_base = devm_ioremap(&pdev->dev,
  87                        res_alt->start, resource_size(res_alt));
  88        } else {
  89                base = devm_ioport_map(&pdev->dev,
  90                        res_base->start, resource_size(res_base));
  91                alt_base = devm_ioport_map(&pdev->dev,
  92                        res_alt->start, resource_size(res_alt));
  93        }
  94
  95        memset(&hw, 0, sizeof(hw));
  96        plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
  97        hw.dev = &pdev->dev;
  98
  99        d.irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
 100        if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
 101                d.irq_flags |= IRQF_SHARED;
 102
 103        if (mmio)
 104                d.host_flags |= IDE_HFLAG_MMIO;
 105
 106        ret = ide_host_add(&d, hws, 1, &host);
 107        if (ret)
 108                goto out;
 109
 110        platform_set_drvdata(pdev, host);
 111
 112        return 0;
 113
 114out:
 115        return ret;
 116}
 117
 118static int __devexit plat_ide_remove(struct platform_device *pdev)
 119{
 120        struct ide_host *host = dev_get_drvdata(&pdev->dev);
 121
 122        ide_host_remove(host);
 123
 124        return 0;
 125}
 126
 127static struct platform_driver platform_ide_driver = {
 128        .driver = {
 129                .name = "pata_platform",
 130                .owner = THIS_MODULE,
 131        },
 132        .probe = plat_ide_probe,
 133        .remove = __devexit_p(plat_ide_remove),
 134};
 135
 136static int __init platform_ide_init(void)
 137{
 138        return platform_driver_register(&platform_ide_driver);
 139}
 140
 141static void __exit platform_ide_exit(void)
 142{
 143        platform_driver_unregister(&platform_ide_driver);
 144}
 145
 146MODULE_DESCRIPTION("Platform IDE driver");
 147MODULE_LICENSE("GPL");
 148MODULE_ALIAS("platform:pata_platform");
 149
 150module_init(platform_ide_init);
 151module_exit(platform_ide_exit);
 152
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