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;
  37         int index, i;
  38
  39         for (index = 0; index < MAX_HWIFS; ++index) {
  40                 hwif = ide_hwifs + index;
  41                 if (hwif->io_ports[IDE_DATA_OFFSET] == port)
  42                         goto found;
  43         }
  44
  45         for (index = 0; index < MAX_HWIFS; ++index) {
  46                 hwif = ide_hwifs + index;
  47                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
  48                         goto found;
  49         }
  50
  51         return NULL;
  52
  53 found:
  54
  55         hwif->hw.io_ports[IDE_DATA_OFFSET] = port;
  56
  57         port += (1 << pdata->ioport_shift);
  58         for (i = IDE_ERROR_OFFSET; i <= IDE_STATUS_OFFSET;
  59              i++, port += (1 << pdata->ioport_shift))
  60                 hwif->hw.io_ports[i] = port;
  61
  62         hwif->hw.io_ports[IDE_CONTROL_OFFSET] = (unsigned long)ctrl;
  63
  64         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
  65         hwif->hw.irq = hwif->irq = irq;
  66
  67         hwif->hw.dma = NO_DMA;
  68         hwif->chipset = hwif->hw.chipset = ide_generic;
  69
  70         if (mmio) {
  71                 hwif->mmio = 1;
  72                 default_hwif_mmiops(hwif);
  73         }
  74
  75         hwif_prop.hwif = hwif;
  76         hwif_prop.index = index;
  77
  78         return hwif;
  79 }
  80
  81 static int __devinit plat_ide_probe(struct platform_device *pdev)
  82 {
  83         struct resource *res_base, *res_alt, *res_irq;
  84         ide_hwif_t *hwif;
  85         struct pata_platform_info *pdata;
  86         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
  87         int ret = 0;
  88         int mmio = 0;
  89
  90         pdata = pdev->dev.platform_data;
  91
  92         /* get a pointer to the register memory */
  93         res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  94         res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  95
  96         if (!res_base || !res_alt) {
  97                 res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  98                 res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  99                 if (!res_base || !res_alt) {
 100                         ret = -ENOMEM;
 101                         goto out;
 102                 }
 103                 mmio = 1;
 104         }
 105
 106         res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 107         if (!res_irq) {
 108                 ret = -EINVAL;
 109                 goto out;
 110         }
 111
 112         if (mmio) {
 113                 hwif_prop.plat_ide_mapbase = devm_ioremap(&pdev->dev,
 114                         res_base->start, res_base->end - res_base->start + 1);
 115                 hwif_prop.plat_ide_alt_mapbase = devm_ioremap(&pdev->dev,
 116                         res_alt->start, res_alt->end - res_alt->start + 1);
 117         } else {
 118                 hwif_prop.plat_ide_mapbase = devm_ioport_map(&pdev->dev,
 119                         res_base->start, res_base->end - res_base->start + 1);
 120                 hwif_prop.plat_ide_alt_mapbase = devm_ioport_map(&pdev->dev,
 121                         res_alt->start, res_alt->end - res_alt->start + 1);
 122         }
 123
 124         hwif = plat_ide_locate_hwif(hwif_prop.plat_ide_mapbase,
 125                  hwif_prop.plat_ide_alt_mapbase, pdata, res_irq->start, mmio);
 126
 127         if (!hwif) {
 128                 ret = -ENODEV;
 129                 goto out;
 130         }
 131         hwif->gendev.parent = &pdev->dev;
 132         hwif->noprobe = 0;
 133
 134         idx[0] = hwif->index;
 135
 136         ide_device_add(idx);
 137
 138         platform_set_drvdata(pdev, hwif);
 139
 140         return 0;
 141
 142 out:
 143         return ret;
 144 }
 145
 146 static int __devexit plat_ide_remove(struct platform_device *pdev)
 147 {
 148         ide_hwif_t *hwif = pdev->dev.driver_data;
 149
 150         if (hwif != hwif_prop.hwif) {
 151                 dev_printk(KERN_DEBUG, &pdev->dev, "%s: hwif value error",
 152                            pdev->name);
 153         } else {
 154                 ide_unregister(hwif_prop.index);
 155                 hwif_prop.index = 0;
 156                 hwif_prop.hwif = NULL;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static struct platform_driver platform_ide_driver = {
 163         .driver = {
 164                 .name = "pata_platform",
 165         },
 166         .probe = plat_ide_probe,
 167         .remove = __devexit_p(plat_ide_remove),
 168 };
 169
 170 static int __init platform_ide_init(void)
 171 {
 172         return platform_driver_register(&platform_ide_driver);
 173 }
 174
 175 static void __exit platform_ide_exit(void)
 176 {
 177         platform_driver_unregister(&platform_ide_driver);
 178 }
 179
 180 MODULE_DESCRIPTION("Platform IDE driver");
 181 MODULE_LICENSE("GPL");
 182
 183 module_init(platform_ide_init);
 184 module_exit(platform_ide_exit);