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