Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 649 insertions, 0 deletions

diff --git a/drivers/scsi/53c700.h b/drivers/scsi/53c700.h
new file mode 100644
index 00000000000..df4aa30ae0a
--- /dev/null
+++ b/drivers/scsi/53c700.h
@@ -0,0 +1,649 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* Driver for 53c700 and 53c700-66 chips from NCR and Symbios
+ *
+ * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
+ */
+
+#ifndef _53C700_H
+#define _53C700_H
+
+#include <linux/interrupt.h>
+#include <asm/io.h>
+
+#include <scsi/scsi_device.h>
+
+
+#if defined(CONFIG_53C700_MEM_MAPPED) && defined(CONFIG_53C700_IO_MAPPED)
+#define CONFIG_53C700_BOTH_MAPPED
+#endif
+
+/* Turn on for general debugging---too verbose for normal use */
+#undef	NCR_700_DEBUG
+/* Debug the tag queues, checking hash queue allocation and deallocation
+ * and search for duplicate tags */
+#undef NCR_700_TAG_DEBUG
+
+#ifdef NCR_700_DEBUG
+#define DEBUG(x)	printk x
+#else
+#define DEBUG(x)
+#endif
+
+/* The number of available command slots */
+#define NCR_700_COMMAND_SLOTS_PER_HOST	64
+/* The maximum number of Scatter Gathers we allow */
+#define NCR_700_SG_SEGMENTS		32
+/* The maximum number of luns (make this of the form 2^n) */
+#define NCR_700_MAX_LUNS		32
+#define NCR_700_LUN_MASK		(NCR_700_MAX_LUNS - 1)
+/* Maximum number of tags the driver ever allows per device */
+#define NCR_700_MAX_TAGS		16
+/* Tag depth the driver starts out with (can be altered in sysfs) */
+#define NCR_700_DEFAULT_TAGS		4
+/* This is the default number of commands per LUN in the untagged case.
+ * two is a good value because it means we can have one command active and
+ * one command fully prepared and waiting
+ */
+#define NCR_700_CMD_PER_LUN		2
+/* magic byte identifying an internally generated REQUEST_SENSE command */
+#define NCR_700_INTERNAL_SENSE_MAGIC	0x42
+
+/* WARNING: Leave this in for now: the dependency preprocessor doesn't
+ * pick up file specific flags, so must define here if they are not
+ * set */
+#if !defined(CONFIG_53C700_IO_MAPPED) && !defined(CONFIG_53C700_MEM_MAPPED)
+#error "Config.in must define either CONFIG_53C700_IO_MAPPED or CONFIG_53C700_MEM_MAPPED to use this scsi core."
+#endif
+
+struct NCR_700_Host_Parameters;
+
+/* These are the externally used routines */
+struct Scsi_Host *NCR_700_detect(struct scsi_host_template *,
+		struct NCR_700_Host_Parameters *, struct device *);
+int NCR_700_release(struct Scsi_Host *host);
+irqreturn_t NCR_700_intr(int, void *, struct pt_regs *);
+
+
+enum NCR_700_Host_State {
+	NCR_700_HOST_BUSY,
+	NCR_700_HOST_FREE,
+};
+
+struct NCR_700_SG_List {
+	/* The following is a script fragment to move the buffer onto the
+	 * bus and then link the next fragment or return */
+	#define	SCRIPT_MOVE_DATA_IN		0x09000000
+	#define	SCRIPT_MOVE_DATA_OUT		0x08000000
+	__u32	ins;
+	__u32	pAddr;
+	#define	SCRIPT_NOP			0x80000000
+	#define	SCRIPT_RETURN			0x90080000
+};
+
+/* We use device->hostdata to store negotiated parameters.  This is
+ * supposed to be a pointer to a device private area, but we cannot
+ * really use it as such since it will never be freed, so just use the
+ * 32 bits to cram the information.  The SYNC negotiation sequence looks
+ * like:
+ * 
+ * If DEV_NEGOTIATED_SYNC not set, tack and SDTR message on to the
+ * initial identify for the device and set DEV_BEGIN_SYNC_NEGOTATION
+ * If we get an SDTR reply, work out the SXFER parameters, squirrel
+ * them away here, clear DEV_BEGIN_SYNC_NEGOTIATION and set
+ * DEV_NEGOTIATED_SYNC.  If we get a REJECT msg, squirrel
+ *
+ *
+ * 0:7	SXFER_REG negotiated value for this device
+ * 8:15 Current queue depth
+ * 16	negotiated SYNC flag
+ * 17 begin SYNC negotiation flag 
+ * 18 device supports tag queueing */
+#define NCR_700_DEV_NEGOTIATED_SYNC	(1<<16)
+#define NCR_700_DEV_BEGIN_SYNC_NEGOTIATION	(1<<17)
+#define NCR_700_DEV_PRINT_SYNC_NEGOTIATION (1<<19)
+
+static inline void
+NCR_700_set_depth(struct scsi_device *SDp, __u8 depth)
+{
+	long l = (long)SDp->hostdata;
+
+	l &= 0xffff00ff;
+	l |= 0xff00 & (depth << 8);
+	SDp->hostdata = (void *)l;
+}
+static inline __u8
+NCR_700_get_depth(struct scsi_device *SDp)
+{
+	return ((((unsigned long)SDp->hostdata) & 0xff00)>>8);
+}
+static inline int
+NCR_700_is_flag_set(struct scsi_device *SDp, __u32 flag)
+{
+	return (spi_flags(SDp->sdev_target) & flag) == flag;
+}
+static inline int
+NCR_700_is_flag_clear(struct scsi_device *SDp, __u32 flag)
+{
+	return (spi_flags(SDp->sdev_target) & flag) == 0;
+}
+static inline void
+NCR_700_set_flag(struct scsi_device *SDp, __u32 flag)
+{
+	spi_flags(SDp->sdev_target) |= flag;
+}
+static inline void
+NCR_700_clear_flag(struct scsi_device *SDp, __u32 flag)
+{
+	spi_flags(SDp->sdev_target) &= ~flag;
+}
+
+enum NCR_700_tag_neg_state {
+	NCR_700_START_TAG_NEGOTIATION = 0,
+	NCR_700_DURING_TAG_NEGOTIATION = 1,
+	NCR_700_FINISHED_TAG_NEGOTIATION = 2,
+};
+
+static inline enum NCR_700_tag_neg_state
+NCR_700_get_tag_neg_state(struct scsi_device *SDp)
+{
+	return (enum NCR_700_tag_neg_state)((spi_flags(SDp->sdev_target)>>20) & 0x3);
+}
+
+static inline void
+NCR_700_set_tag_neg_state(struct scsi_device *SDp,
+			  enum NCR_700_tag_neg_state state)
+{
+	/* clear the slot */
+	spi_flags(SDp->sdev_target) &= ~(0x3 << 20);
+	spi_flags(SDp->sdev_target) |= ((__u32)state) << 20;
+}
+
+struct NCR_700_command_slot {
+	struct NCR_700_SG_List	SG[NCR_700_SG_SEGMENTS+1];
+	struct NCR_700_SG_List	*pSG;
+	#define NCR_700_SLOT_MASK 0xFC
+	#define NCR_700_SLOT_MAGIC 0xb8
+	#define	NCR_700_SLOT_FREE (0|NCR_700_SLOT_MAGIC) /* slot may be used */
+	#define NCR_700_SLOT_BUSY (1|NCR_700_SLOT_MAGIC) /* slot has command active on HA */
+	#define NCR_700_SLOT_QUEUED (2|NCR_700_SLOT_MAGIC) /* slot has command to be made active on HA */
+	__u8	state;
+	int	tag;
+	__u32	resume_offset;
+	struct scsi_cmnd *cmnd;
+	/* The pci_mapped address of the actual command in cmnd */
+	dma_addr_t	pCmd;
+	__u32		temp;
+	/* if this command is a pci_single mapping, holds the dma address
+	 * for later unmapping in the done routine */
+	dma_addr_t	dma_handle;
+	/* historical remnant, now used to link free commands */
+	struct NCR_700_command_slot *ITL_forw;
+};
+
+struct NCR_700_Host_Parameters {
+	/* These must be filled in by the calling driver */
+	int	clock;			/* board clock speed in MHz */
+	unsigned long	base;		/* the base for the port (copied to host) */
+	struct device	*dev;
+	__u32	dmode_extra;	/* adjustable bus settings */
+	__u32	differential:1;	/* if we are differential */
+#ifdef CONFIG_53C700_LE_ON_BE
+	/* This option is for HP only.  Set it if your chip is wired for
+	 * little endian on this platform (which is big endian) */
+	__u32	force_le_on_be:1;
+#endif
+	__u32	chip710:1;	/* set if really a 710 not 700 */
+	__u32	burst_disable:1;	/* set to 1 to disable 710 bursting */
+
+	/* NOTHING BELOW HERE NEEDS ALTERING */
+	__u32	fast:1;		/* if we can alter the SCSI bus clock
+                                   speed (so can negiotiate sync) */
+#ifdef CONFIG_53C700_BOTH_MAPPED
+	__u32	mem_mapped;	/* set if memory mapped */
+#endif
+	int	sync_clock;	/* The speed of the SYNC core */
+
+	__u32	*script;		/* pointer to script location */
+	__u32	pScript;		/* physical mem addr of script */
+
+	enum NCR_700_Host_State state; /* protected by state lock */
+	struct scsi_cmnd *cmd;
+	/* Note: pScript contains the single consistent block of
+	 * memory.  All the msgin, msgout and status are allocated in
+	 * this memory too (at separate cache lines).  TOTAL_MEM_SIZE
+	 * represents the total size of this area */
+#define	MSG_ARRAY_SIZE	8
+#define	MSGOUT_OFFSET	(L1_CACHE_ALIGN(sizeof(SCRIPT)))
+	__u8	*msgout;
+#define MSGIN_OFFSET	(MSGOUT_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
+	__u8	*msgin;
+#define STATUS_OFFSET	(MSGIN_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
+	__u8	*status;
+#define SLOTS_OFFSET	(STATUS_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
+	struct NCR_700_command_slot	*slots;
+#define	TOTAL_MEM_SIZE	(SLOTS_OFFSET + L1_CACHE_ALIGN(sizeof(struct NCR_700_command_slot) * NCR_700_COMMAND_SLOTS_PER_HOST))
+	int	saved_slot_position;
+	int	command_slot_count; /* protected by state lock */
+	__u8	tag_negotiated;
+	__u8	rev;
+	__u8	reselection_id;
+	__u8	min_period;
+
+	/* Free list, singly linked by ITL_forw elements */
+	struct NCR_700_command_slot *free_list;
+	/* Completion for waited for ops, like reset, abort or
+	 * device reset.
+	 *
+	 * NOTE: relies on single threading in the error handler to
+	 * have only one outstanding at once */
+	struct completion *eh_complete;
+};
+
+/*
+ *	53C700 Register Interface - the offset from the Selected base
+ *	I/O address */
+#ifdef CONFIG_53C700_LE_ON_BE
+#define bE	(hostdata->force_le_on_be ? 0 : 3)
+#define	bSWAP	(hostdata->force_le_on_be)
+#elif defined(__BIG_ENDIAN)
+#define bE	3
+#define bSWAP	0
+#elif defined(__LITTLE_ENDIAN)
+#define bE	0
+#define bSWAP	0
+#else
+#error "__BIG_ENDIAN or __LITTLE_ENDIAN must be defined, did you include byteorder.h?"
+#endif
+#define bS_to_cpu(x)	(bSWAP ? le32_to_cpu(x) : (x))
+#define bS_to_host(x)	(bSWAP ? cpu_to_le32(x) : (x))
+
+/* NOTE: These registers are in the LE register space only, the required byte
+ * swapping is done by the NCR_700_{read|write}[b] functions */
+#define	SCNTL0_REG			0x00
+#define		FULL_ARBITRATION	0xc0
+#define 	PARITY			0x08
+#define		ENABLE_PARITY		0x04
+#define 	AUTO_ATN		0x02
+#define	SCNTL1_REG			0x01
+#define 	SLOW_BUS		0x80
+#define		ENABLE_SELECT		0x20
+#define		ASSERT_RST		0x08
+#define		ASSERT_EVEN_PARITY	0x04
+#define	SDID_REG			0x02
+#define	SIEN_REG			0x03
+#define 	PHASE_MM_INT		0x80
+#define 	FUNC_COMP_INT		0x40
+#define 	SEL_TIMEOUT_INT		0x20
+#define 	SELECT_INT		0x10
+#define 	GROSS_ERR_INT		0x08
+#define 	UX_DISC_INT		0x04
+#define 	RST_INT			0x02
+#define 	PAR_ERR_INT		0x01
+#define	SCID_REG			0x04
+#define SXFER_REG			0x05
+#define		ASYNC_OPERATION		0x00
+#define SODL_REG                        0x06
+#define	SOCL_REG			0x07
+#define	SFBR_REG			0x08
+#define	SIDL_REG			0x09
+#define	SBDL_REG			0x0A
+#define	SBCL_REG			0x0B
+/* read bits */
+#define		SBCL_IO			0x01
+/*write bits */
+#define		SYNC_DIV_AS_ASYNC	0x00
+#define		SYNC_DIV_1_0		0x01
+#define		SYNC_DIV_1_5		0x02
+#define		SYNC_DIV_2_0		0x03
+#define	DSTAT_REG			0x0C
+#define		ILGL_INST_DETECTED	0x01
+#define		WATCH_DOG_INTERRUPT	0x02
+#define		SCRIPT_INT_RECEIVED	0x04
+#define		ABORTED			0x10
+#define	SSTAT0_REG			0x0D
+#define		PARITY_ERROR		0x01
+#define		SCSI_RESET_DETECTED	0x02
+#define		UNEXPECTED_DISCONNECT	0x04
+#define		SCSI_GROSS_ERROR	0x08
+#define		SELECTED		0x10
+#define		SELECTION_TIMEOUT	0x20
+#define		FUNCTION_COMPLETE	0x40
+#define		PHASE_MISMATCH 		0x80
+#define	SSTAT1_REG			0x0E
+#define		SIDL_REG_FULL		0x80
+#define		SODR_REG_FULL		0x40
+#define		SODL_REG_FULL		0x20
+#define SSTAT2_REG                      0x0F
+#define CTEST0_REG                      0x14
+#define		BTB_TIMER_DISABLE	0x40
+#define CTEST1_REG                      0x15
+#define CTEST2_REG                      0x16
+#define CTEST3_REG                      0x17
+#define CTEST4_REG                      0x18
+#define         DISABLE_FIFO            0x00
+#define         SLBE                    0x10
+#define         SFWR                    0x08
+#define         BYTE_LANE0              0x04
+#define         BYTE_LANE1              0x05
+#define         BYTE_LANE2              0x06
+#define         BYTE_LANE3              0x07
+#define         SCSI_ZMODE              0x20
+#define         ZMODE                   0x40
+#define CTEST5_REG                      0x19
+#define         MASTER_CONTROL          0x10
+#define         DMA_DIRECTION           0x08
+#define CTEST7_REG                      0x1B
+#define		BURST_DISABLE		0x80 /* 710 only */
+#define		SEL_TIMEOUT_DISABLE	0x10 /* 710 only */
+#define         DFP                     0x08
+#define         EVP                     0x04
+#define		DIFF			0x01
+#define CTEST6_REG                      0x1A
+#define	TEMP_REG			0x1C
+#define	DFIFO_REG			0x20
+#define		FLUSH_DMA_FIFO		0x80
+#define		CLR_FIFO		0x40
+#define	ISTAT_REG			0x21
+#define		ABORT_OPERATION		0x80
+#define		SOFTWARE_RESET_710	0x40
+#define		DMA_INT_PENDING		0x01
+#define		SCSI_INT_PENDING	0x02
+#define		CONNECTED		0x08
+#define CTEST8_REG                      0x22
+#define         LAST_DIS_ENBL           0x01
+#define		SHORTEN_FILTERING	0x04
+#define		ENABLE_ACTIVE_NEGATION	0x10
+#define		GENERATE_RECEIVE_PARITY	0x20
+#define		CLR_FIFO_710		0x04
+#define		FLUSH_DMA_FIFO_710	0x08
+#define CTEST9_REG                      0x23
+#define	DBC_REG				0x24
+#define	DCMD_REG			0x27
+#define	DNAD_REG			0x28
+#define	DIEN_REG			0x39
+#define		BUS_FAULT		0x20
+#define 	ABORT_INT		0x10
+#define 	INT_INST_INT		0x04
+#define 	WD_INT			0x02
+#define 	ILGL_INST_INT		0x01
+#define	DCNTL_REG			0x3B
+#define		SOFTWARE_RESET		0x01
+#define		COMPAT_700_MODE		0x01
+#define 	SCRPTS_16BITS		0x20
+#define		ASYNC_DIV_2_0		0x00
+#define		ASYNC_DIV_1_5		0x40
+#define		ASYNC_DIV_1_0		0x80
+#define		ASYNC_DIV_3_0		0xc0
+#define DMODE_710_REG			0x38
+#define	DMODE_700_REG			0x34
+#define		BURST_LENGTH_1		0x00
+#define		BURST_LENGTH_2		0x40
+#define		BURST_LENGTH_4		0x80
+#define		BURST_LENGTH_8		0xC0
+#define		DMODE_FC1		0x10
+#define		DMODE_FC2		0x20
+#define 	BW16			32 
+#define 	MODE_286		16
+#define 	IO_XFER			8
+#define 	FIXED_ADDR		4
+
+#define DSP_REG                         0x2C
+#define DSPS_REG                        0x30
+
+/* Parameters to begin SDTR negotiations.  Empirically, I find that
+ * the 53c700-66 cannot handle an offset >8, so don't change this  */
+#define NCR_700_MAX_OFFSET	8
+/* Was hoping the max offset would be greater for the 710, but
+ * empirically it seems to be 8 also */
+#define NCR_710_MAX_OFFSET	8
+#define NCR_700_MIN_XFERP	1
+#define NCR_710_MIN_XFERP	0
+#define NCR_700_MIN_PERIOD	25 /* for SDTR message, 100ns */
+
+#define script_patch_32(script, symbol, value) \
+{ \
+	int i; \
+	for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
+		__u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]) + value; \
+		(script)[A_##symbol##_used[i]] = bS_to_host(val); \
+		dma_cache_sync(&(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
+		DEBUG((" script, patching %s at %d to 0x%lx\n", \
+		       #symbol, A_##symbol##_used[i], (value))); \
+	} \
+}
+
+#define script_patch_32_abs(script, symbol, value) \
+{ \
+	int i; \
+	for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
+		(script)[A_##symbol##_used[i]] = bS_to_host(value); \
+		dma_cache_sync(&(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
+		DEBUG((" script, patching %s at %d to 0x%lx\n", \
+		       #symbol, A_##symbol##_used[i], (value))); \
+	} \
+}
+
+/* Used for patching the SCSI ID in the SELECT instruction */
+#define script_patch_ID(script, symbol, value) \
+{ \
+	int i; \
+	for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
+		__u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]); \
+		val &= 0xff00ffff; \
+		val |= ((value) & 0xff) << 16; \
+		(script)[A_##symbol##_used[i]] = bS_to_host(val); \
+		dma_cache_sync(&(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
+		DEBUG((" script, patching ID field %s at %d to 0x%x\n", \
+		       #symbol, A_##symbol##_used[i], val)); \
+	} \
+}
+
+#define script_patch_16(script, symbol, value) \
+{ \
+	int i; \
+	for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
+		__u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]); \
+		val &= 0xffff0000; \
+		val |= ((value) & 0xffff); \
+		(script)[A_##symbol##_used[i]] = bS_to_host(val); \
+		dma_cache_sync(&(script)[A_##symbol##_used[i]], 4, DMA_TO_DEVICE); \
+		DEBUG((" script, patching short field %s at %d to 0x%x\n", \
+		       #symbol, A_##symbol##_used[i], val)); \
+	} \
+}
+
+
+static inline __u8
+NCR_700_mem_readb(struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	return readb(host->base + (reg^bE));
+}
+
+static inline __u32
+NCR_700_mem_readl(struct Scsi_Host *host, __u32 reg)
+{
+	__u32 value = __raw_readl(host->base + reg);
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+#if 1
+	/* sanity check the register */
+	if((reg & 0x3) != 0)
+		BUG();
+#endif
+
+	return bS_to_cpu(value);
+}
+
+static inline void
+NCR_700_mem_writeb(__u8 value, struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	writeb(value, host->base + (reg^bE));
+}
+
+static inline void
+NCR_700_mem_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+#if 1
+	/* sanity check the register */
+	if((reg & 0x3) != 0)
+		BUG();
+#endif
+
+	__raw_writel(bS_to_host(value), host->base + reg);
+}
+
+static inline __u8
+NCR_700_io_readb(struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	return inb(host->base + (reg^bE));
+}
+
+static inline __u32
+NCR_700_io_readl(struct Scsi_Host *host, __u32 reg)
+{
+	__u32 value = inl(host->base + reg);
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+#if 1
+	/* sanity check the register */
+	if((reg & 0x3) != 0)
+		BUG();
+#endif
+
+	return bS_to_cpu(value);
+}
+
+static inline void
+NCR_700_io_writeb(__u8 value, struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	outb(value, host->base + (reg^bE));
+}
+
+static inline void
+NCR_700_io_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+#if 1
+	/* sanity check the register */
+	if((reg & 0x3) != 0)
+		BUG();
+#endif
+
+	outl(bS_to_host(value), host->base + reg);
+}
+
+#ifdef CONFIG_53C700_BOTH_MAPPED
+
+static inline __u8
+NCR_700_readb(struct Scsi_Host *host, __u32 reg)
+{
+	__u8 val;
+
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	if(hostdata->mem_mapped)
+		val = NCR_700_mem_readb(host, reg);
+	else
+		val = NCR_700_io_readb(host, reg);
+
+	return val;
+}
+
+static inline __u32
+NCR_700_readl(struct Scsi_Host *host, __u32 reg)
+{
+	__u32 val;
+
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	if(hostdata->mem_mapped)
+		val = NCR_700_mem_readl(host, reg);
+	else
+		val = NCR_700_io_readl(host, reg);
+
+	return val;
+}
+
+static inline void
+NCR_700_writeb(__u8 value, struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	if(hostdata->mem_mapped)
+		NCR_700_mem_writeb(value, host, reg);
+	else
+		NCR_700_io_writeb(value, host, reg);
+}
+
+static inline void
+NCR_700_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
+{
+	const struct NCR_700_Host_Parameters *hostdata __attribute__((unused))
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	if(hostdata->mem_mapped)
+		NCR_700_mem_writel(value, host, reg);
+	else
+		NCR_700_io_writel(value, host, reg);
+}
+
+static inline void
+NCR_700_set_mem_mapped(struct NCR_700_Host_Parameters *hostdata)
+{
+	hostdata->mem_mapped = 1;
+}
+
+static inline void
+NCR_700_set_io_mapped(struct NCR_700_Host_Parameters *hostdata)
+{
+	hostdata->mem_mapped = 0;
+}
+
+
+#elif defined(CONFIG_53C700_IO_MAPPED)
+
+#define NCR_700_readb NCR_700_io_readb
+#define NCR_700_readl NCR_700_io_readl
+#define NCR_700_writeb NCR_700_io_writeb
+#define NCR_700_writel NCR_700_io_writel
+
+#define NCR_700_set_io_mapped(x)
+#define NCR_700_set_mem_mapped(x)	error I/O mapped only
+
+#elif defined(CONFIG_53C700_MEM_MAPPED)
+
+#define NCR_700_readb NCR_700_mem_readb
+#define NCR_700_readl NCR_700_mem_readl
+#define NCR_700_writeb NCR_700_mem_writeb
+#define NCR_700_writel NCR_700_mem_writel
+
+#define NCR_700_set_io_mapped(x)	error MEM mapped only
+#define NCR_700_set_mem_mapped(x)
+
+#else
+#error neither CONFIG_53C700_MEM_MAPPED nor CONFIG_53C700_IO_MAPPED is set
+#endif
+
+#endif