linux/drivers/ide/legacy/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/pata_platform.h>
  21#include <linux/platform_device.h>
  22#include <linux/io.h>
  23
  24static struct {
  25        void __iomem *plat_ide_mapbase;
  26        void __iomem *plat_ide_alt_mapbase;
  27        ide_hwif_t *hwif;
  28        int index;
  29} hwif_prop;
  30
  31static ide_hwif_t *__devinit plat_ide_locate_hwif(void __iomem *base,
  32            void __iomem *ctrl, struct pata_platform_info *pdata, int irq,
  33            int mmio)
  34{
  35        unsigned long port = (unsigned long)base;
  36        ide_hwif_t *hwif = ide_find_port(port);
  37        int i;
  38
  39        if (hwif == NULL)
  40                goto out;
  41
  42        hwif->io_ports[IDE_DATA_OFFSET] = port;
  43
  44        port += (1 << pdata->ioport_shift);
  45        for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET;
  46             i++, port += (1 << pdata->ioport_shift))
  47                hwif->io_ports[i] = port;
  48
  49        hwif->io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl;
  50
  51        hwif->irq = irq;
  52
  53        hwif->chipset = ide_generic;
  54
  55        if (mmio) {
  56                hwif->mmio = 1;
  57                default_hwif_mmiops(hwif);
  58        }
  59
  60        hwif_prop.hwif = hwif;
  61        hwif_prop.index = hwif->index;
  62out:
  63        return hwif;
  64}
  65
  66static int __devinit plat_ide_probe(struct platform_device *pdev)
  67{
  68        struct resource *res_base, *res_alt, *res_irq;
  69        ide_hwif_t *hwif;
  70        struct pata_platform_info *pdata;
  71        u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
  72        int ret = 0;
  73        int mmio = 0;
  74
  75        pdata = pdev->dev.platform_data;
  76
  77        /* get a pointer to the register memory */
  78        res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  79        res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  80
  81        if (!res_base || !res_alt) {
  82                res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  83                res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  84                if (!res_base || !res_alt) {
  85                        ret = -ENOMEM;
  86                        goto out;
  87                }
  88                mmio = 1;
  89        }
  90
  91        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  92        if (!res_irq) {
  93                ret = -EINVAL;
  94                goto out;
  95        }
  96
  97        if (mmio) {
  98                hwif_prop.plat_ide_mapbase = devm_ioremap(&pdev->dev,
  99                        res_base->start, res_base->end - res_base->start + 1);
 100                hwif_prop.plat_ide_alt_mapbase = devm_ioremap(&pdev->dev,
 101                        res_alt->start, res_alt->end - res_alt->start + 1);
 102        } else {
 103                hwif_prop.plat_ide_mapbase = devm_ioport_map(&pdev->dev,
 104                        res_base->start, res_base->end - res_base->start + 1);
 105                hwif_prop.plat_ide_alt_mapbase = devm_ioport_map(&pdev->dev,
 106                        res_alt->start, res_alt->end - res_alt->start + 1);
 107        }
 108
 109        hwif = plat_ide_locate_hwif(hwif_prop.plat_ide_mapbase,
 110                 hwif_prop.plat_ide_alt_mapbase, pdata, res_irq->start, mmio);
 111
 112        if (!hwif) {
 113                ret = -ENODEV;
 114                goto out;
 115        }
 116        hwif->gendev.parent = &pdev->dev;
 117        hwif->noprobe = 0;
 118
 119        idx[0] = hwif->index;
 120
 121        ide_device_add(idx);
 122
 123        platform_set_drvdata(pdev, hwif);
 124
 125        return 0;
 126
 127out:
 128        return ret;
 129}
 130
 131static int __devexit plat_ide_remove(struct platform_device *pdev)
 132{
 133        ide_hwif_t *hwif = pdev->dev.driver_data;
 134
 135        if (hwif != hwif_prop.hwif) {
 136                dev_printk(KERN_DEBUG, &pdev->dev, "%s: hwif value error",
 137                           pdev->name);
 138        } else {
 139                ide_unregister(hwif_prop.index);
 140                hwif_prop.index = 0;
 141                hwif_prop.hwif = NULL;
 142        }
 143
 144        return 0;
 145}
 146
 147static struct platform_driver platform_ide_driver = {
 148        .driver = {
 149                .name = "pata_platform",
 150        },
 151        .probe = plat_ide_probe,
 152        .remove = __devexit_p(plat_ide_remove),
 153};
 154
 155static int __init platform_ide_init(void)
 156{
 157        return platform_driver_register(&platform_ide_driver);
 158}
 159
 160static void __exit platform_ide_exit(void)
 161{
 162        platform_driver_unregister(&platform_ide_driver);
 163}
 164
 165MODULE_DESCRIPTION("Platform IDE driver");
 166MODULE_LICENSE("GPL");
 167
 168module_init(platform_ide_init);
 169module_exit(platform_ide_exit);
 170
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