linux-imx

/*

 *  sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware

 *

 *  Copyright 2004-2005 Red Hat, Inc.

 *

 *  Author/maintainer:  Jeff Garzik <jgarzik@pobox.com>

 *

 *  This file is subject to the terms and conditions of the GNU General Public

 *  License.  See the file "COPYING" in the main directory of this archive

 *  for more details.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/blk-mq.h>

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <linux/compiler.h>

#include <linux/workqueue.h>

#include <linux/bitops.h>

#include <linux/delay.h>

#include <linux/ktime.h>

#include <linux/hdreg.h>

#include <linux/dma-mapping.h>

#include <linux/completion.h>

#include <linux/scatterlist.h>

#include <asm/io.h>

#include <linux/uaccess.h>

​

#if 0

#define CARM_DEBUG

#define CARM_VERBOSE_DEBUG

#else

#undef CARM_DEBUG

#undef CARM_VERBOSE_DEBUG

#endif

#undef CARM_NDEBUG

​

#define DRV_NAME "sx8"

#define DRV_VERSION "1.0"

#define PFX DRV_NAME ": "

​

MODULE_AUTHOR("Jeff Garzik");

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("Promise SATA SX8 block driver");

MODULE_VERSION(DRV_VERSION);

​

/*

 * SX8 hardware has a single message queue for all ATA ports.

 * When this driver was written, the hardware (firmware?) would

 * corrupt data eventually, if more than one request was outstanding.

 * As one can imagine, having 8 ports bottlenecking on a single

 * command hurts performance.

 *

 * Based on user reports, later versions of the hardware (firmware?)

 * seem to be able to survive with more than one command queued.

 *

 * Therefore, we default to the safe option -- 1 command -- but

 * allow the user to increase this.