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Linux/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 = dev_get_platdata(&pdev->dev);
 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 module_platform_driver(platform_ide_driver);
135 
136 MODULE_DESCRIPTION("Platform IDE driver");
137 MODULE_LICENSE("GPL");
138 MODULE_ALIAS("platform:pata_platform");
139 

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