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