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linux/drivers/scsi/53c700.h
Christoph Hellwig 91af2dd255 53c700: improve non-coherent DMA handling 
Switch the 53c700 driver to only use non-coherent descriptor memory if it
really has to because dma_alloc_coherent fails.  This doesn't matter for
any of the platforms it runs on currently, but that will change soon.

To help with this two new helpers to transfer ownership to and from the
device are added that abstract the syncing of the non-coherent memory.
The two current bidirectional cases are mapped to transfers to the
device, as that appears to what they are used for.  Note that for parisc,
which is the only architecture this driver needs to use non-coherent
memory on, the direction argument of dma_cache_sync is ignored, so this
will not change behavior in any way.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-09-25 06:20:43 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/* -*- 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>
#include <scsi/scsi_cmnd.h>
/* 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
#define DDEBUG(prefix, sdev, fmt, a...) \
sdev_printk(prefix, sdev, fmt, ##a)
#define CDEBUG(prefix, scmd, fmt, a...) \
scmd_printk(prefix, scmd, fmt, ##a)
#else
#define DEBUG(x) do {} while (0)
#define DDEBUG(prefix, scmd, fmt, a...) do {} while (0)
#define CDEBUG(prefix, scmd, fmt, a...) do {} while (0)
#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
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 *);
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
};
struct NCR_700_Device_Parameters {
/* space for creating a request sense command. Really, except
* for the annoying SCSI-2 requirement for LUN information in
* cmnd[1], this could be in static storage */
unsigned char cmnd[MAX_COMMAND_SIZE];
__u8 depth;
struct scsi_cmnd *current_cmnd; /* currently active command */
};
/* 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_NEGOTIATION
* 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 char *NCR_700_get_sense_cmnd(struct scsi_device *SDp)
{
struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
return hostdata->cmnd;
}
static inline void
NCR_700_set_depth(struct scsi_device *SDp, __u8 depth)
{
struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
hostdata->depth = depth;
}
static inline __u8
NCR_700_get_depth(struct scsi_device *SDp)
{
struct NCR_700_Device_Parameters *hostdata = SDp->hostdata;
return hostdata->depth;
}
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;
#define NCR_700_FLAG_AUTOSENSE 0x01
__u8 flags;
__u8 pad1[2]; /* Needed for m68k where min alignment is 2 bytes */
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 */
void __iomem *base; /* the base for the port (copied to host) */
struct device *dev;
__u32 dmode_extra; /* adjustable bus settings */
__u32 dcntl_extra; /* adjustable bus settings */
__u32 ctest7_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_length:4; /* set to 0 to disable 710 bursting */
__u32 noncoherent:1; /* needs to use non-coherent DMA */
/* NOTHING BELOW HERE NEEDS ALTERING */
__u32 fast:1; /* if we can alter the SCSI bus clock
speed (so can negiotiate sync) */
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)
#define bEBus (!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
#ifndef bEBus
#ifdef CONFIG_53C700_BE_BUS
#define bEBus 1
#else
#define bEBus 0
#endif
#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 CTEST7_TT1 0x02
#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 EA_710 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(h, script, symbol, value) \
{ \
int i; \
dma_addr_t da = value; \
for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
__u32 val = bS_to_cpu((script)[A_##symbol##_used[i]]) + da; \
(script)[A_##symbol##_used[i]] = bS_to_host(val); \
dma_sync_to_dev((h), &(script)[A_##symbol##_used[i]], 4); \
DEBUG((" script, patching %s at %d to %pad\n", \
#symbol, A_##symbol##_used[i], &da)); \
} \
}
#define script_patch_32_abs(h, script, symbol, value) \
{ \
int i; \
dma_addr_t da = value; \
for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32)); i++) { \
(script)[A_##symbol##_used[i]] = bS_to_host(da); \
dma_sync_to_dev((h), &(script)[A_##symbol##_used[i]], 4); \
DEBUG((" script, patching %s at %d to %pad\n", \
#symbol, A_##symbol##_used[i], &da)); \
} \
}
/* Used for patching the SCSI ID in the SELECT instruction */
#define script_patch_ID(h, 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_sync_to_dev((h), &(script)[A_##symbol##_used[i]], 4); \
DEBUG((" script, patching ID field %s at %d to 0x%x\n", \
#symbol, A_##symbol##_used[i], val)); \
} \
}
#define script_patch_16(h, 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_sync_to_dev((h), &(script)[A_##symbol##_used[i]], 4); \
DEBUG((" script, patching short field %s at %d to 0x%x\n", \
#symbol, A_##symbol##_used[i], val)); \
} \
}
static inline __u8
NCR_700_readb(struct Scsi_Host *host, __u32 reg)
{
const struct NCR_700_Host_Parameters *hostdata
= (struct NCR_700_Host_Parameters *)host->hostdata[0];
return ioread8(hostdata->base + (reg^bE));
}
static inline __u32
NCR_700_readl(struct Scsi_Host *host, __u32 reg)
{
const struct NCR_700_Host_Parameters *hostdata
= (struct NCR_700_Host_Parameters *)host->hostdata[0];
__u32 value = bEBus ? ioread32be(hostdata->base + reg) :
ioread32(hostdata->base + reg);
#if 1
/* sanity check the register */
BUG_ON((reg & 0x3) != 0);
#endif
return value;
}
static inline void
NCR_700_writeb(__u8 value, struct Scsi_Host *host, __u32 reg)
{
const struct NCR_700_Host_Parameters *hostdata
= (struct NCR_700_Host_Parameters *)host->hostdata[0];
iowrite8(value, hostdata->base + (reg^bE));
}
static inline void
NCR_700_writel(__u32 value, struct Scsi_Host *host, __u32 reg)
{
const struct NCR_700_Host_Parameters *hostdata
= (struct NCR_700_Host_Parameters *)host->hostdata[0];
#if 1
/* sanity check the register */
BUG_ON((reg & 0x3) != 0);
#endif
bEBus ? iowrite32be(value, hostdata->base + reg):
iowrite32(value, hostdata->base + reg);
}
#endif
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