text: /*
   * 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>
   *
   * 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;
  
  	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 = 2;
  	hwif->noprobe = 0;
  
  	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
  		hwif->hw.io_ports[i] =
  				(unsigned long)(base + ((0x1f0 + i) << 5));
  	hwif->hw.io_ports[IDE_CONTROL_OFFSET] =
  				(unsigned long)(base + (0x3f6 << 5));
  	hwif->hw.irq = K_INT_GB_IDE;
  
  	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
  	hwif->irq = hwif->hw.irq;
  
  	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 = kmalloc(sizeof (*pldev), GFP_KERNEL))) {
  		err = -ENOMEM;
  		goto out_unregister_driver;
  	}
  
  	memset (pldev, 0, sizeof (*pldev));
  	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);
  