drivers/ide/legacy/ide_platform.c

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