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