drivers/ide/mips/swarm.c

   1 /*
   2  * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
   3  * Copyright (C) 2004 MontaVista Software Inc.
   4  *      Author: Manish Lachwani, mlachwani@mvista.com
   5  * Copyright (C) 2004  MIPS Technologies, Inc.  All rights reserved.
   6  *      Author: Maciej W. Rozycki <macro@mips.com>
   7  * Copyright (c) 2006  Maciej W. Rozycki
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23
  24 /*
  25  *  Derived loosely from ide-pmac.c, so:
  26  *  Copyright (C) 1998 Paul Mackerras.
  27  *  Copyright (C) 1995-1998 Mark Lord
  28  */
  29
  30 /*
  31  * Boards with SiByte processors so far have supported IDE devices via
  32  * the Generic Bus, PCI bus, and built-in PCMCIA interface.  In all
  33  * cases, byte-swapping must be avoided for these devices (whereas
  34  * other PCI devices, for example, will require swapping).  Any
  35  * SiByte-targetted kernel including IDE support will include this
  36  * file.  Probing of a Generic Bus for an IDE device is controlled by
  37  * the definition of "SIBYTE_HAVE_IDE", which is provided by
  38  * <asm/sibyte/board.h> for Broadcom boards.
  39  */
  40
  41 #include <linux/ide.h>
  42 #include <linux/ioport.h>
  43 #include <linux/kernel.h>
  44 #include <linux/types.h>
  45 #include <linux/platform_device.h>
  46
  47 #include <asm/io.h>
  48
  49 #include <asm/sibyte/board.h>
  50 #include <asm/sibyte/sb1250_genbus.h>
  51 #include <asm/sibyte/sb1250_regs.h>
  52
  53 #define DRV_NAME "ide-swarm"
  54
  55 static char swarm_ide_string[] = DRV_NAME;
  56
  57 static struct resource swarm_ide_resource = {
  58         .name   = "SWARM GenBus IDE",
  59         .flags  = IORESOURCE_MEM,
  60 };
  61
  62 static struct platform_device *swarm_ide_dev;
  63
  64 /*
  65  * swarm_ide_probe - if the board header indicates the existence of
  66  * Generic Bus IDE, allocate a HWIF for it.
  67  */
  68 static int __devinit swarm_ide_probe(struct device *dev)
  69 {
  70         ide_hwif_t *hwif;
  71         u8 __iomem *base;
  72         phys_t offset, size;
  73         int i;
  74         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
  75
  76         if (!SIBYTE_HAVE_IDE)
  77                 return -ENODEV;
  78
  79         /* Find an empty slot.  */
  80         for (i = 0; i < MAX_HWIFS; i++)
  81                 if (!ide_hwifs[i].io_ports[IDE_DATA_OFFSET])
  82                         break;
  83         if (i >= MAX_HWIFS) {
  84                 printk(KERN_ERR DRV_NAME ": no free slot for interface\n");
  85                 return -ENOMEM;
  86         }
  87
  88         hwif = ide_hwifs + i;
  89
  90         base = ioremap(A_IO_EXT_BASE, 0x800);
  91         offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
  92         size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
  93         iounmap(base);
  94
  95         offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
  96         size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
  97         if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
  98                 printk(KERN_INFO DRV_NAME
  99                        ": IDE interface at GenBus disabled\n");
 100                 return -EBUSY;
 101         }
 102
 103         printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n",
 104                IDE_CS);
 105
 106         swarm_ide_resource.start = offset;
 107         swarm_ide_resource.end = offset + size - 1;
 108         if (request_resource(&iomem_resource, &swarm_ide_resource)) {
 109                 printk(KERN_ERR DRV_NAME
 110                        ": can't request I/O memory resource\n");
 111                 return -EBUSY;
 112         }
 113
 114         base = ioremap(offset, size);
 115
 116         /* Setup MMIO ops.  */
 117         default_hwif_mmiops(hwif);
 118         /* Prevent resource map manipulation.  */
 119         hwif->mmio = 1;
 120         hwif->chipset = ide_generic;
 121         hwif->noprobe = 0;
 122
 123         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 124                 hwif->io_ports[i] =
 125                                 (unsigned long)(base + ((0x1f0 + i) << 5));
 126         hwif->io_ports[IDE_CONTROL_OFFSET] =
 127                                 (unsigned long)(base + (0x3f6 << 5));
 128         hwif->irq = K_INT_GB_IDE;
 129
 130         idx[0] = hwif->index;
 131
 132         ide_device_add(idx, NULL);
 133
 134         dev_set_drvdata(dev, hwif);
 135
 136         return 0;
 137 }
 138
 139 static struct device_driver swarm_ide_driver = {
 140         .name   = swarm_ide_string,
 141         .bus    = &platform_bus_type,
 142         .probe  = swarm_ide_probe,
 143 };
 144
 145 static void swarm_ide_platform_release(struct device *device)
 146 {
 147         struct platform_device *pldev;
 148
 149         /* free device */
 150         pldev = to_platform_device(device);
 151         kfree(pldev);
 152 }
 153
 154 static int __devinit swarm_ide_init_module(void)
 155 {
 156         struct platform_device *pldev;
 157         int err;
 158
 159         printk(KERN_INFO "SWARM IDE driver\n");
 160
 161         if (driver_register(&swarm_ide_driver)) {
 162                 printk(KERN_ERR "Driver registration failed\n");
 163                 err = -ENODEV;
 164                 goto out;
 165         }
 166
 167         if (!(pldev = kzalloc(sizeof (*pldev), GFP_KERNEL))) {
 168                 err = -ENOMEM;
 169                 goto out_unregister_driver;
 170         }
 171
 172         pldev->name             = swarm_ide_string;
 173         pldev->id               = 0;
 174         pldev->dev.release      = swarm_ide_platform_release;
 175
 176         if (platform_device_register(pldev)) {
 177                 err = -ENODEV;
 178                 goto out_free_pldev;
 179         }
 180
 181         if (!pldev->dev.driver) {
 182                 /*
 183                  * The driver was not bound to this device, there was
 184                  * no hardware at this address. Unregister it, as the
 185                  * release fuction will take care of freeing the
 186                  * allocated structure
 187                  */
 188                 platform_device_unregister (pldev);
 189         }
 190
 191         swarm_ide_dev = pldev;
 192
 193         return 0;
 194
 195 out_free_pldev:
 196         kfree(pldev);
 197
 198 out_unregister_driver:
 199         driver_unregister(&swarm_ide_driver);
 200 out:
 201         return err;
 202 }
 203
 204 module_init(swarm_ide_init_module);