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