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, 2008  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 static const struct ide_port_info swarm_port_info = {
  65         .name                   = DRV_NAME,
  66         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
  67 };
  68
  69 /*
  70  * swarm_ide_probe - if the board header indicates the existence of
  71  * Generic Bus IDE, allocate a HWIF for it.
  72  */
  73 static int __devinit swarm_ide_probe(struct device *dev)
  74 {
  75         u8 __iomem *base;
  76         struct ide_host *host;
  77         phys_t offset, size;
  78         int i, rc;
  79         hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
  80
  81         if (!SIBYTE_HAVE_IDE)
  82                 return -ENODEV;
  83
  84         base = ioremap(A_IO_EXT_BASE, 0x800);
  85         offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
  86         size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
  87         iounmap(base);
  88
  89         offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
  90         size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
  91         if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
  92                 printk(KERN_INFO DRV_NAME
  93                        ": IDE interface at GenBus disabled\n");
  94                 return -EBUSY;
  95         }
  96
  97         printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n",
  98                IDE_CS);
  99
 100         swarm_ide_resource.start = offset;
 101         swarm_ide_resource.end = offset + size - 1;
 102         if (request_resource(&iomem_resource, &swarm_ide_resource)) {
 103                 printk(KERN_ERR DRV_NAME
 104                        ": can't request I/O memory resource\n");
 105                 return -EBUSY;
 106         }
 107
 108         base = ioremap(offset, size);
 109
 110         for (i = 0; i <= 7; i++)
 111                 hw.io_ports_array[i] =
 112                                 (unsigned long)(base + ((0x1f0 + i) << 5));
 113         hw.io_ports.ctl_addr =
 114                                 (unsigned long)(base + (0x3f6 << 5));
 115         hw.irq = K_INT_GB_IDE;
 116         hw.chipset = ide_generic;
 117
 118         rc = ide_host_add(&swarm_port_info, hws, &host);
 119         if (rc)
 120                 goto err;
 121
 122         dev_set_drvdata(dev, host);
 123
 124         return 0;
 125 err:
 126         release_resource(&swarm_ide_resource);
 127         iounmap(base);
 128         return rc;
 129 }
 130
 131 static struct device_driver swarm_ide_driver = {
 132         .name   = swarm_ide_string,
 133         .bus    = &platform_bus_type,
 134         .probe  = swarm_ide_probe,
 135 };
 136
 137 static void swarm_ide_platform_release(struct device *device)
 138 {
 139         struct platform_device *pldev;
 140
 141         /* free device */
 142         pldev = to_platform_device(device);
 143         kfree(pldev);
 144 }
 145
 146 static int __devinit swarm_ide_init_module(void)
 147 {
 148         struct platform_device *pldev;
 149         int err;
 150
 151         printk(KERN_INFO "SWARM IDE driver\n");
 152
 153         if (driver_register(&swarm_ide_driver)) {
 154                 printk(KERN_ERR "Driver registration failed\n");
 155                 err = -ENODEV;
 156                 goto out;
 157         }
 158
 159         if (!(pldev = kzalloc(sizeof (*pldev), GFP_KERNEL))) {
 160                 err = -ENOMEM;
 161                 goto out_unregister_driver;
 162         }
 163
 164         pldev->name             = swarm_ide_string;
 165         pldev->id               = 0;
 166         pldev->dev.release      = swarm_ide_platform_release;
 167
 168         if (platform_device_register(pldev)) {
 169                 err = -ENODEV;
 170                 goto out_free_pldev;
 171         }
 172
 173         if (!pldev->dev.driver) {
 174                 /*
 175                  * The driver was not bound to this device, there was
 176                  * no hardware at this address. Unregister it, as the
 177                  * release fuction will take care of freeing the
 178                  * allocated structure
 179                  */
 180                 platform_device_unregister (pldev);
 181         }
 182
 183         swarm_ide_dev = pldev;
 184
 185         return 0;
 186
 187 out_free_pldev:
 188         kfree(pldev);
 189
 190 out_unregister_driver:
 191         driver_unregister(&swarm_ide_driver);
 192 out:
 193         return err;
 194 }
 195
 196 module_init(swarm_ide_init_module);