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swarm.c

/*
 * Copyright (C) 2001, 2002, 2003 Broadcom Corporation
 * Copyright (C) 2004 MontaVista Software Inc.
 *    Author:     Manish Lachwani, mlachwani@mvista.com
 * Copyright (C) 2004  MIPS Technologies, Inc.  All rights reserved.
 *    Author: Maciej W. Rozycki <macro@mips.com>
 * Copyright (c) 2006  Maciej W. Rozycki
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/*
 *  Derived loosely from ide-pmac.c, so:
 *  Copyright (C) 1998 Paul Mackerras.
 *  Copyright (C) 1995-1998 Mark Lord
 */

/*
 * Boards with SiByte processors so far have supported IDE devices via
 * the Generic Bus, PCI bus, and built-in PCMCIA interface.  In all
 * cases, byte-swapping must be avoided for these devices (whereas
 * other PCI devices, for example, will require swapping).  Any
 * SiByte-targetted kernel including IDE support will include this
 * file.  Probing of a Generic Bus for an IDE device is controlled by
 * the definition of "SIBYTE_HAVE_IDE", which is provided by
 * <asm/sibyte/board.h> for Broadcom boards.
 */

#include <linux/ide.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/platform_device.h>

#include <asm/io.h>

#include <asm/sibyte/board.h>
#include <asm/sibyte/sb1250_genbus.h>
#include <asm/sibyte/sb1250_regs.h>

#define DRV_NAME "ide-swarm"

static char swarm_ide_string[] = DRV_NAME;

static struct resource swarm_ide_resource = {
      .name = "SWARM GenBus IDE",
      .flags      = IORESOURCE_MEM,
};

static struct platform_device *swarm_ide_dev;

/*
 * swarm_ide_probe - if the board header indicates the existence of
 * Generic Bus IDE, allocate a HWIF for it.
 */
static int __devinit swarm_ide_probe(struct device *dev)
{
      ide_hwif_t *hwif;
      u8 __iomem *base;
      phys_t offset, size;
      int i;
      u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };

      if (!SIBYTE_HAVE_IDE)
            return -ENODEV;

      /* Find an empty slot.  */
      for (i = 0; i < MAX_HWIFS; i++)
            if (!ide_hwifs[i].io_ports[IDE_DATA_OFFSET])
                  break;
      if (i >= MAX_HWIFS) {
            printk(KERN_ERR DRV_NAME ": no free slot for interface\n");
            return -ENOMEM;
      }

      hwif = ide_hwifs + i;

      base = ioremap(A_IO_EXT_BASE, 0x800);
      offset = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_START_ADDR, IDE_CS));
      size = __raw_readq(base + R_IO_EXT_REG(R_IO_EXT_MULT_SIZE, IDE_CS));
      iounmap(base);

      offset = G_IO_START_ADDR(offset) << S_IO_ADDRBASE;
      size = (G_IO_MULT_SIZE(size) + 1) << S_IO_REGSIZE;
      if (offset < A_PHYS_GENBUS || offset >= A_PHYS_GENBUS_END) {
            printk(KERN_INFO DRV_NAME
                   ": IDE interface at GenBus disabled\n");
            return -EBUSY;
      }

      printk(KERN_INFO DRV_NAME ": IDE interface at GenBus slot %i\n",
             IDE_CS);

      swarm_ide_resource.start = offset;
      swarm_ide_resource.end = offset + size - 1;
      if (request_resource(&iomem_resource, &swarm_ide_resource)) {
            printk(KERN_ERR DRV_NAME
                   ": can't request I/O memory resource\n");
            return -EBUSY;
      }

      base = ioremap(offset, size);

      /* Setup MMIO ops.  */
      default_hwif_mmiops(hwif);
      /* Prevent resource map manipulation.  */
      hwif->mmio = 1;
      hwif->noprobe = 0;

      for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
            hwif->io_ports[i] =
                        (unsigned long)(base + ((0x1f0 + i) << 5));
      hwif->io_ports[IDE_CONTROL_OFFSET] =
                        (unsigned long)(base + (0x3f6 << 5));
      hwif->irq = K_INT_GB_IDE;

      idx[0] = hwif->index;

      ide_device_add(idx);

      dev_set_drvdata(dev, hwif);

      return 0;
}

static struct device_driver swarm_ide_driver = {
      .name = swarm_ide_string,
      .bus  = &platform_bus_type,
      .probe      = swarm_ide_probe,
};

static void swarm_ide_platform_release(struct device *device)
{
      struct platform_device *pldev;

      /* free device */
      pldev = to_platform_device(device);
      kfree(pldev);
}

static int __devinit swarm_ide_init_module(void)
{
      struct platform_device *pldev;
      int err;

      printk(KERN_INFO "SWARM IDE driver\n");

      if (driver_register(&swarm_ide_driver)) {
            printk(KERN_ERR "Driver registration failed\n");
            err = -ENODEV;
            goto out;
      }

        if (!(pldev = kzalloc(sizeof (*pldev), GFP_KERNEL))) {
            err = -ENOMEM;
            goto out_unregister_driver;
      }

      pldev->name       = swarm_ide_string;
      pldev->id         = 0;
      pldev->dev.release      = swarm_ide_platform_release;

      if (platform_device_register(pldev)) {
            err = -ENODEV;
            goto out_free_pldev;
      }

        if (!pldev->dev.driver) {
            /*
             * The driver was not bound to this device, there was
                 * no hardware at this address. Unregister it, as the
             * release fuction will take care of freeing the
             * allocated structure
             */
            platform_device_unregister (pldev);
      }

      swarm_ide_dev = pldev;

      return 0;

out_free_pldev:
      kfree(pldev);

out_unregister_driver:
      driver_unregister(&swarm_ide_driver);
out:
      return err;
}

module_init(swarm_ide_init_module);

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