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