drivers/ide/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/ata_platform.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/io.h>
  24
  25 static void plat_ide_setup_ports(struct ide_hw *hw, void __iomem *base,
  26                                  void __iomem *ctrl,
  27                                  struct pata_platform_info *pdata, int irq)
  28 {
  29         unsigned long port = (unsigned long)base;
  30         int i;
  31
  32         hw->io_ports.data_addr = port;
  33
  34         port += (1 << pdata->ioport_shift);
  35         for (i = 1; i <= 7;
  36              i++, port += (1 << pdata->ioport_shift))
  37                 hw->io_ports_array[i] = port;
  38
  39         hw->io_ports.ctl_addr = (unsigned long)ctrl;
  40
  41         hw->irq = irq;
  42 }
  43
  44 static const struct ide_port_info platform_ide_port_info = {
  45         .host_flags             = IDE_HFLAG_NO_DMA,
  46         .chipset                = ide_generic,
  47 };
  48
  49 static int plat_ide_probe(struct platform_device *pdev)
  50 {
  51         struct resource *res_base, *res_alt, *res_irq;
  52         void __iomem *base, *alt_base;
  53         struct pata_platform_info *pdata;
  54         struct ide_host *host;
  55         int ret = 0, mmio = 0;
  56         struct ide_hw hw, *hws[] = { &hw };
  57         struct ide_port_info d = platform_ide_port_info;
  58
  59         pdata = pdev->dev.platform_data;
  60
  61         /* get a pointer to the register memory */
  62         res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  63         res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  64
  65         if (!res_base || !res_alt) {
  66                 res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  67                 res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  68                 if (!res_base || !res_alt) {
  69                         ret = -ENOMEM;
  70                         goto out;
  71                 }
  72                 mmio = 1;
  73         }
  74
  75         res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  76         if (!res_irq) {
  77                 ret = -EINVAL;
  78                 goto out;
  79         }
  80
  81         if (mmio) {
  82                 base = devm_ioremap(&pdev->dev,
  83                         res_base->start, resource_size(res_base));
  84                 alt_base = devm_ioremap(&pdev->dev,
  85                         res_alt->start, resource_size(res_alt));
  86         } else {
  87                 base = devm_ioport_map(&pdev->dev,
  88                         res_base->start, resource_size(res_base));
  89                 alt_base = devm_ioport_map(&pdev->dev,
  90                         res_alt->start, resource_size(res_alt));
  91         }
  92
  93         memset(&hw, 0, sizeof(hw));
  94         plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
  95         hw.dev = &pdev->dev;
  96
  97         d.irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
  98         if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
  99                 d.irq_flags |= IRQF_SHARED;
 100
 101         if (mmio)
 102                 d.host_flags |= IDE_HFLAG_MMIO;
 103
 104         ret = ide_host_add(&d, hws, 1, &host);
 105         if (ret)
 106                 goto out;
 107
 108         platform_set_drvdata(pdev, host);
 109
 110         return 0;
 111
 112 out:
 113         return ret;
 114 }
 115
 116 static int plat_ide_remove(struct platform_device *pdev)
 117 {
 118         struct ide_host *host = dev_get_drvdata(&pdev->dev);
 119
 120         ide_host_remove(host);
 121
 122         return 0;
 123 }
 124
 125 static struct platform_driver platform_ide_driver = {
 126         .driver = {
 127                 .name = "pata_platform",
 128                 .owner = THIS_MODULE,
 129         },
 130         .probe = plat_ide_probe,
 131         .remove = plat_ide_remove,
 132 };
 133
 134 static int __init platform_ide_init(void)
 135 {
 136         return platform_driver_register(&platform_ide_driver);
 137 }
 138
 139 static void __exit platform_ide_exit(void)
 140 {
 141         platform_driver_unregister(&platform_ide_driver);
 142 }
 143
 144 MODULE_DESCRIPTION("Platform IDE driver");
 145 MODULE_LICENSE("GPL");
 146 MODULE_ALIAS("platform:pata_platform");
 147
 148 module_init(platform_ide_init);
 149 module_exit(platform_ide_exit);