release/src-rt-6.x/linux/linux-2.6/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
  75         if (!SIBYTE_HAVE_IDE)
  76                 return -ENODEV;
  77
  78         /* Find an empty slot.  */
  79         for (i = 0; i < MAX_HWIFS; i++)
  80                 if (!ide_hwifs[i].io_ports[IDE_DATA_OFFSET])
  81                         break;
  82         if (i >= MAX_HWIFS) {
  83                 printk(KERN_ERR DRV_NAME ": no free slot for interface\n");
  84                 return -ENOMEM;
  85         }
  86
  87         hwif = ide_hwifs + i;
  88
  89         base = ioremap(A_IO_EXT_BASE, 0x800);
  90         offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
  91         size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
  92         iounmap(base);
  93
  94         offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
  95         size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
  96         if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
  97                 printk(KERN_INFO DRV_NAME
  98                        ": IDE interface at GenBus disabled\n");
  99                 return -EBUSY;
 100         }
 101
 102         printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n",
 103                IDE_CS);
 104
 105         swarm_ide_resource.start = offset;
 106         swarm_ide_resource.end = offset + size - 1;
 107         if (request_resource(&iomem_resource, &swarm_ide_resource)) {
 108                 printk(KERN_ERR DRV_NAME
 109                        ": can't request I/O memory resource\n");
 110                 return -EBUSY;
 111         }
 112
 113         base = ioremap(offset, size);
 114
 115         /* Setup MMIO ops.  */
 116         default_hwif_mmiops(hwif);
 117         /* Prevent resource map manipulation.  */
 118         hwif->mmio = 1;
 119         hwif->noprobe = 0;
 120
 121         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 122                 hwif->hw.io_ports[i] =
 123                                 (unsigned long)(base + ((0x1f0 + i) << 5));
 124         hwif->hw.io_ports[IDE_CONTROL_OFFSET] =
 125                                 (unsigned long)(base + (0x3f6 << 5));
 126         hwif->hw.irq = K_INT_GB_IDE;
 127
 128         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
 129         hwif->irq = hwif->hw.irq;
 130
 131         probe_hwif_init(hwif);
 132
 133         ide_proc_register_port(hwif);
 134
 135         dev_set_drvdata(dev, hwif);
 136
 137         return 0;
 138 }
 139
 140 static struct device_driver swarm_ide_driver = {
 141         .name   = swarm_ide_string,
 142         .bus    = &platform_bus_type,
 143         .probe  = swarm_ide_probe,
 144 };
 145
 146 static void swarm_ide_platform_release(struct device *device)
 147 {
 148         struct platform_device *pldev;
 149
 150         /* free device */
 151         pldev = to_platform_device(device);
 152         kfree(pldev);
 153 }
 154
 155 static int __devinit swarm_ide_init_module(void)
 156 {
 157         struct platform_device *pldev;
 158         int err;
 159
 160         printk(KERN_INFO "SWARM IDE driver\n");
 161
 162         if (driver_register(&swarm_ide_driver)) {
 163                 printk(KERN_ERR "Driver registration failed\n");
 164                 err = -ENODEV;
 165                 goto out;
 166         }
 167
 168         if (!(pldev = kzalloc(sizeof (*pldev), GFP_KERNEL))) {
 169                 err = -ENOMEM;
 170                 goto out_unregister_driver;
 171         }
 172
 173         pldev->name             = swarm_ide_string;
 174         pldev->id               = 0;
 175         pldev->dev.release      = swarm_ide_platform_release;
 176
 177         if (platform_device_register(pldev)) {
 178                 err = -ENODEV;
 179                 goto out_free_pldev;
 180         }
 181
 182         if (!pldev->dev.driver) {
 183                 /*
 184                  * The driver was not bound to this device, there was
 185                  * no hardware at this address. Unregister it, as the
 186                  * release fuction will take care of freeing the
 187                  * allocated structure
 188                  */
 189                 platform_device_unregister (pldev);
 190         }
 191
 192         swarm_ide_dev = pldev;
 193
 194         return 0;
 195
 196 out_free_pldev:
 197         kfree(pldev);
 198
 199 out_unregister_driver:
 200         driver_unregister(&swarm_ide_driver);
 201 out:
 202         return err;
 203 }
 204
 205 module_init(swarm_ide_init_module);