aic79xx_osm.h

h内核

/*
 * Adaptec AIC79xx device driver for Linux.
 *
 * Copyright (c) 2000-2001 Adaptec Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.h#137 $
 *
 */
#ifndef _AIC79XX_LINUX_H_
#define _AIC79XX_LINUX_H_

#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/smp_lock.h>
#include <linux/version.h>
#include <linux/module.h>
#include <asm/byteorder.h>
#include <asm/io.h>

#include <linux/interrupt.h> /* For tasklet support. */
#include <linux/config.h>
#include <linux/slab.h>

/* Core SCSI definitions */
#define AIC_LIB_PREFIX ahd
#include "scsi.h"
#include <scsi/scsi_host.h>

/* Name space conflict with BSD queue macros */
#ifdef LIST_HEAD
#undef LIST_HEAD
#endif

#include "cam.h"
#include "queue.h"
#include "scsi_message.h"
#include "scsi_iu.h"
#include "aiclib.h"

/*********************************** Debugging ********************************/
#ifdef CONFIG_AIC79XX_DEBUG_ENABLE
#ifdef CONFIG_AIC79XX_DEBUG_MASK
#define AHD_DEBUG 1
#define AHD_DEBUG_OPTS CONFIG_AIC79XX_DEBUG_MASK
#else
/*
 * Compile in debugging code, but do not enable any printfs.
 */
#define AHD_DEBUG 1
#define AHD_DEBUG_OPTS 0
#endif
/* No debugging code. */
#endif

/********************************** Misc Macros *******************************/
#define	roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
#define	powerof2(x)	((((x)-1)&(x))==0)

/************************* Forward Declarations *******************************/
struct ahd_softc;
typedef struct pci_dev *ahd_dev_softc_t;
typedef Scsi_Cmnd      *ahd_io_ctx_t;

/******************************* Byte Order ***********************************/
#define ahd_htobe16(x)	cpu_to_be16(x)
#define ahd_htobe32(x)	cpu_to_be32(x)
#define ahd_htobe64(x)	cpu_to_be64(x)
#define ahd_htole16(x)	cpu_to_le16(x)
#define ahd_htole32(x)	cpu_to_le32(x)
#define ahd_htole64(x)	cpu_to_le64(x)

#define ahd_be16toh(x)	be16_to_cpu(x)
#define ahd_be32toh(x)	be32_to_cpu(x)
#define ahd_be64toh(x)	be64_to_cpu(x)
#define ahd_le16toh(x)	le16_to_cpu(x)
#define ahd_le32toh(x)	le32_to_cpu(x)
#define ahd_le64toh(x)	le64_to_cpu(x)

#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#endif

#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#endif

#ifndef BYTE_ORDER
#if defined(__BIG_ENDIAN)
#define BYTE_ORDER BIG_ENDIAN
#endif
#if defined(__LITTLE_ENDIAN)
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#endif /* BYTE_ORDER */

/************************* Configuration Data *********************************/
extern uint32_t aic79xx_allow_memio;
extern int aic79xx_detect_complete;
extern Scsi_Host_Template aic79xx_driver_template;

/***************************** Bus Space/DMA **********************************/

typedef uint32_t bus_size_t;

typedef enum {
	BUS_SPACE_MEMIO,
	BUS_SPACE_PIO
} bus_space_tag_t;

typedef union {
	u_long		  ioport;
	volatile uint8_t __iomem *maddr;
} bus_space_handle_t;

typedef struct bus_dma_segment
{
	dma_addr_t	ds_addr;
	bus_size_t	ds_len;
} bus_dma_segment_t;

struct ahd_linux_dma_tag
{
	bus_size_t	alignment;
	bus_size_t	boundary;
	bus_size_t	maxsize;
};
typedef struct ahd_linux_dma_tag* bus_dma_tag_t;

struct ahd_linux_dmamap
{
	dma_addr_t	bus_addr;
};
typedef struct ahd_linux_dmamap* bus_dmamap_t;

typedef int bus_dma_filter_t(void*, dma_addr_t);
typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);

#define BUS_DMA_WAITOK		0x0
#define BUS_DMA_NOWAIT		0x1
#define BUS_DMA_ALLOCNOW	0x2
#define BUS_DMA_LOAD_SEGS	0x4	/*
					 * Argument is an S/G list not
					 * a single buffer.
					 */

#define BUS_SPACE_MAXADDR	0xFFFFFFFF
#define BUS_SPACE_MAXADDR_32BIT	0xFFFFFFFF
#define BUS_SPACE_MAXSIZE_32BIT	0xFFFFFFFF

int	ahd_dma_tag_create(struct ahd_softc *, bus_dma_tag_t /*parent*/,
			   bus_size_t /*alignment*/, bus_size_t /*boundary*/,
			   dma_addr_t /*lowaddr*/, dma_addr_t /*highaddr*/,
			   bus_dma_filter_t*/*filter*/, void */*filterarg*/,
			   bus_size_t /*maxsize*/, int /*nsegments*/,
			   bus_size_t /*maxsegsz*/, int /*flags*/,
			   bus_dma_tag_t */*dma_tagp*/);

void	ahd_dma_tag_destroy(struct ahd_softc *, bus_dma_tag_t /*tag*/);

int	ahd_dmamem_alloc(struct ahd_softc *, bus_dma_tag_t /*dmat*/,
			 void** /*vaddr*/, int /*flags*/,
			 bus_dmamap_t* /*mapp*/);

void	ahd_dmamem_free(struct ahd_softc *, bus_dma_tag_t /*dmat*/,
			void* /*vaddr*/, bus_dmamap_t /*map*/);

void	ahd_dmamap_destroy(struct ahd_softc *, bus_dma_tag_t /*tag*/,
			   bus_dmamap_t /*map*/);

int	ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t /*dmat*/,
			bus_dmamap_t /*map*/, void * /*buf*/,
			bus_size_t /*buflen*/, bus_dmamap_callback_t *,
			void */*callback_arg*/, int /*flags*/);

int	ahd_dmamap_unload(struct ahd_softc *, bus_dma_tag_t, bus_dmamap_t);

/*
 * Operations performed by ahd_dmamap_sync().
 */
#define BUS_DMASYNC_PREREAD	0x01	/* pre-read synchronization */
#define BUS_DMASYNC_POSTREAD	0x02	/* post-read synchronization */
#define BUS_DMASYNC_PREWRITE	0x04	/* pre-write synchronization */
#define BUS_DMASYNC_POSTWRITE	0x08	/* post-write synchronization */

/*
 * XXX
 * ahd_dmamap_sync is only used on buffers allocated with
 * the pci_alloc_consistent() API.  Although I'm not sure how
 * this works on architectures with a write buffer, Linux does
 * not have an API to sync "coherent" memory.  Perhaps we need
 * to do an mb()?
 */
#define ahd_dmamap_sync(ahd, dma_tag, dmamap, offset, len, op)

/************************** Timer DataStructures ******************************/
typedef struct timer_list ahd_timer_t;

/********************************** Includes **********************************/
#ifdef CONFIG_AIC79XX_REG_PRETTY_PRINT
#define AIC_DEBUG_REGISTERS 1
#else
#define AIC_DEBUG_REGISTERS 0
#endif
#include "aic79xx.h"

/***************************** Timer Facilities *******************************/
#define ahd_timer_init init_timer
#define ahd_timer_stop del_timer_sync
typedef void ahd_linux_callback_t (u_long);  
static __inline void ahd_timer_reset(ahd_timer_t *timer, u_int usec,
				     ahd_callback_t *func, void *arg);
static __inline void ahd_scb_timer_reset(struct scb *scb, u_int usec);

static __inline void
ahd_timer_reset(ahd_timer_t *timer, u_int usec, ahd_callback_t *func, void *arg)
{
	struct ahd_softc *ahd;

	ahd = (struct ahd_softc *)arg;
	del_timer(timer);
	timer->data = (u_long)arg;
	timer->expires = jiffies + (usec * HZ)/1000000;
	timer->function = (ahd_linux_callback_t*)func;
	add_timer(timer);
}

static __inline void
ahd_scb_timer_reset(struct scb *scb, u_int usec)
{
	mod_timer(&scb->io_ctx->eh_timeout, jiffies + (usec * HZ)/1000000);
}

/***************************** SMP support ************************************/
#include <linux/spinlock.h>

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) || defined(SCSI_HAS_HOST_LOCK))
#define AHD_SCSI_HAS_HOST_LOCK 1
#else
#define AHD_SCSI_HAS_HOST_LOCK 0
#endif

#define AIC79XX_DRIVER_VERSION "1.3.11"

/**************************** Front End Queues ********************************/
/*
 * Data structure used to cast the Linux struct scsi_cmnd to something
 * that allows us to use the queue macros.  The linux structure has
 * plenty of space to hold the links fields as required by the queue
 * macros, but the queue macors require them to have the correct type.
 */
struct ahd_cmd_internal {
	/* Area owned by the Linux scsi layer. */
	uint8_t	private[offsetof(struct scsi_cmnd, SCp.Status)];
	union {
		STAILQ_ENTRY(ahd_cmd)	ste;
		LIST_ENTRY(ahd_cmd)	le;
		TAILQ_ENTRY(ahd_cmd)	tqe;
	} links;
	uint32_t			end;
};

struct ahd_cmd {
	union {
		struct ahd_cmd_internal	icmd;
		struct scsi_cmnd	scsi_cmd;
	} un;
};

#define acmd_icmd(cmd) ((cmd)->un.icmd)
#define acmd_scsi_cmd(cmd) ((cmd)->un.scsi_cmd)
#define acmd_links un.icmd.links

/*************************** Device Data Structures ***************************/
/*
 * A per probed device structure used to deal with some error recovery
 * scenarios that the Linux mid-layer code just doesn't know how to
 * handle.  The structure allocated for a device only becomes persistent
 * after a successfully completed inquiry command to the target when
 * that inquiry data indicates a lun is present.
 */
TAILQ_HEAD(ahd_busyq, ahd_cmd);
typedef enum {
	AHD_DEV_UNCONFIGURED	 = 0x01,
	AHD_DEV_FREEZE_TIL_EMPTY = 0x02, /* Freeze queue until active == 0 */
	AHD_DEV_TIMER_ACTIVE	 = 0x04, /* Our timer is active */
	AHD_DEV_ON_RUN_LIST	 = 0x08, /* Queued to be run later */
	AHD_DEV_Q_BASIC		 = 0x10, /* Allow basic device queuing */
	AHD_DEV_Q_TAGGED	 = 0x20, /* Allow full SCSI2 command queueing */
	AHD_DEV_PERIODIC_OTAG	 = 0x40, /* Send OTAG to prevent starvation */
	AHD_DEV_SLAVE_CONFIGURED = 0x80	 /* slave_configure() has been called */
} ahd_linux_dev_flags;

struct ahd_linux_target;
struct ahd_linux_device {
	TAILQ_ENTRY(ahd_linux_device) links;
	struct			ahd_busyq busyq;

	/*
	 * The number of transactions currently
	 * queued to the device.
	 */
	int			active;

	/*
	 * The currently allowed number of 
	 * transactions that can be queued to
	 * the device.  Must be signed for
	 * conversion from tagged to untagged
	 * mode where the device may have more
	 * than one outstanding active transaction.
	 */
	int			openings;

	/*
	 * A positive count indicates that this
	 * device's queue is halted.
	 */
	u_int			qfrozen;
	
	/*
	 * Cumulative command counter.
	 */
	u_long			commands_issued;

	/*
	 * The number of tagged transactions when
	 * running at our current opening level
	 * that have been successfully received by
	 * this device since the last QUEUE FULL.
	 */
	u_int			tag_success_count;
#define AHD_TAG_SUCCESS_INTERVAL 50

	ahd_linux_dev_flags	flags;

	/*
	 * Per device timer.
	 */
	struct timer_list	timer;

	/*
	 * The high limit for the tags variable.
	 */
	u_int			maxtags;

	/*
	 * The computed number of tags outstanding