drivers/ide/ide_platform.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Platform IDE driver
   4  *
   5  * Copyright (C) 2007 MontaVista Software
   6  *
   7  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/ide.h>
  14 #include <linux/ioport.h>
  15 #include <linux/module.h>
  16 #include <linux/ata_platform.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/io.h>
  20
  21 static void plat_ide_setup_ports(struct ide_hw *hw, void __iomem *base,
  22                                  void __iomem *ctrl,
  23                                  struct pata_platform_info *pdata, int irq)
  24 {
  25         unsigned long port = (unsigned long)base;
  26         int i;
  27
  28         hw->io_ports.data_addr = port;
  29
  30         port += (1 << pdata->ioport_shift);
  31         for (i = 1; i <= 7;
  32              i++, port += (1 << pdata->ioport_shift))
  33                 hw->io_ports_array[i] = port;
  34
  35         hw->io_ports.ctl_addr = (unsigned long)ctrl;
  36
  37         hw->irq = irq;
  38 }
  39
  40 static const struct ide_port_info platform_ide_port_info = {
  41         .host_flags             = IDE_HFLAG_NO_DMA,
  42         .chipset                = ide_generic,
  43 };
  44
  45 static int plat_ide_probe(struct platform_device *pdev)
  46 {
  47         struct resource *res_base, *res_alt, *res_irq;
  48         void __iomem *base, *alt_base;
  49         struct pata_platform_info *pdata;
  50         struct ide_host *host;
  51         int ret = 0, mmio = 0;
  52         struct ide_hw hw, *hws[] = { &hw };
  53         struct ide_port_info d = platform_ide_port_info;
  54
  55         pdata = dev_get_platdata(&pdev->dev);
  56
  57         /* get a pointer to the register memory */
  58         res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  59         res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  60
  61         if (!res_base || !res_alt) {
  62                 res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  63                 res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  64                 if (!res_base || !res_alt) {
  65                         ret = -ENOMEM;
  66                         goto out;
  67                 }
  68                 mmio = 1;
  69         }
  70
  71         res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  72         if (!res_irq) {
  73                 ret = -EINVAL;
  74                 goto out;
  75         }
  76
  77         if (mmio) {
  78                 base = devm_ioremap(&pdev->dev,
  79                         res_base->start, resource_size(res_base));
  80                 alt_base = devm_ioremap(&pdev->dev,
  81                         res_alt->start, resource_size(res_alt));
  82         } else {
  83                 base = devm_ioport_map(&pdev->dev,
  84                         res_base->start, resource_size(res_base));
  85                 alt_base = devm_ioport_map(&pdev->dev,
  86                         res_alt->start, resource_size(res_alt));
  87         }
  88
  89         memset(&hw, 0, sizeof(hw));
  90         plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
  91         hw.dev = &pdev->dev;
  92
  93         d.irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
  94         if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
  95                 d.irq_flags |= IRQF_SHARED;
  96
  97         if (mmio)
  98                 d.host_flags |= IDE_HFLAG_MMIO;
  99
 100         ret = ide_host_add(&d, hws, 1, &host);
 101         if (ret)
 102                 goto out;
 103
 104         platform_set_drvdata(pdev, host);
 105
 106         return 0;
 107
 108 out:
 109         return ret;
 110 }
 111
 112 static int plat_ide_remove(struct platform_device *pdev)
 113 {
 114         struct ide_host *host = dev_get_drvdata(&pdev->dev);
 115
 116         ide_host_remove(host);
 117
 118         return 0;
 119 }
 120
 121 static struct platform_driver platform_ide_driver = {
 122         .driver = {
 123                 .name = "pata_platform",
 124         },
 125         .probe = plat_ide_probe,
 126         .remove = plat_ide_remove,
 127 };
 128
 129 module_platform_driver(platform_ide_driver);
 130
 131 MODULE_DESCRIPTION("Platform IDE driver");
 132 MODULE_LICENSE("GPL");
 133 MODULE_ALIAS("platform:pata_platform");