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53c700.c
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53c700.c
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/* -*- mode: c; c-basic-offset: 8 -*- */
/* NCR (or Symbios) 53c700 and 53c700-66 Driver
*
* Copyright (C) 2001 by [email protected]
**-----------------------------------------------------------------------------
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
*/
/* Notes:
*
* This driver is designed exclusively for these chips (virtually the
* earliest of the scripts engine chips). They need their own drivers
* because they are missing so many of the scripts and snazzy register
* features of their elder brothers (the 710, 720 and 770).
*
* The 700 is the lowliest of the line, it can only do async SCSI.
* The 700-66 can at least do synchronous SCSI up to 10MHz.
*
* The 700 chip has no host bus interface logic of its own. However,
* it is usually mapped to a location with well defined register
* offsets. Therefore, if you can determine the base address and the
* irq your board incorporating this chip uses, you can probably use
* this driver to run it (although you'll probably have to write a
* minimal wrapper for the purpose---see the NCR_D700 driver for
* details about how to do this).
*
*
* TODO List:
*
* 1. Better statistics in the proc fs
*
* 2. Implement message queue (queues SCSI messages like commands) and make
* the abort and device reset functions use them.
* */
/* CHANGELOG
*
* Version 2.8
*
* Fixed bad bug affecting tag starvation processing (previously the
* driver would hang the system if too many tags starved. Also fixed
* bad bug having to do with 10 byte command processing and REQUEST
* SENSE (the command would loop forever getting a transfer length
* mismatch in the CMD phase).
*
* Version 2.7
*
* Fixed scripts problem which caused certain devices (notably CDRWs)
* to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
* __raw_readl/writel for parisc compatibility (Thomas
* Bogendoerfer). Added missing SCp->request_bufflen initialisation
* for sense requests (Ryan Bradetich).
*
* Version 2.6
*
* Following test of the 64 bit parisc kernel by Richard Hirst,
* several problems have now been corrected. Also adds support for
* consistent memory allocation.
*
* Version 2.5
*
* More Compatibility changes for 710 (now actually works). Enhanced
* support for odd clock speeds which constrain SDTR negotiations.
* correct cacheline separation for scsi messages and status for
* incoherent architectures. Use of the pci mapping functions on
* buffers to begin support for 64 bit drivers.
*
* Version 2.4
*
* Added support for the 53c710 chip (in 53c700 emulation mode only---no
* special 53c710 instructions or registers are used).
*
* Version 2.3
*
* More endianness/cache coherency changes.
*
* Better bad device handling (handles devices lying about tag
* queueing support and devices which fail to provide sense data on
* contingent allegiance conditions)
*
* Many thanks to Richard Hirst <[email protected]> for patiently
* debugging this driver on the parisc architecture and suggesting
* many improvements and bug fixes.
*
* Thanks also go to Linuxcare Inc. for providing several PARISC
* machines for me to debug the driver on.
*
* Version 2.2
*
* Made the driver mem or io mapped; added endian invariance; added
* dma cache flushing operations for architectures which need it;
* added support for more varied clocking speeds.
*
* Version 2.1
*
* Initial modularisation from the D700. See NCR_D700.c for the rest of
* the changelog.
* */
#define NCR_700_VERSION "2.8"
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/byteorder.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>
#include "53c700.h"
/* NOTE: For 64 bit drivers there are points in the code where we use
* a non dereferenceable pointer to point to a structure in dma-able
* memory (which is 32 bits) so that we can use all of the structure
* operations but take the address at the end. This macro allows us
* to truncate the 64 bit pointer down to 32 bits without the compiler
* complaining */
#define to32bit(x) ((__u32)((unsigned long)(x)))
#ifdef NCR_700_DEBUG
#define STATIC
#else
#define STATIC static
#endif
MODULE_AUTHOR("James Bottomley");
MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
MODULE_LICENSE("GPL");
/* This is the script */
#include "53c700_d.h"
STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
STATIC struct device_attribute *NCR_700_dev_attrs[];
STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
static char *NCR_700_phase[] = {
"",
"after selection",
"before command phase",
"after command phase",
"after status phase",
"after data in phase",
"after data out phase",
"during data phase",
};
static char *NCR_700_condition[] = {
"",
"NOT MSG_OUT",
"UNEXPECTED PHASE",
"NOT MSG_IN",
"UNEXPECTED MSG",
"MSG_IN",
"SDTR_MSG RECEIVED",
"REJECT_MSG RECEIVED",
"DISCONNECT_MSG RECEIVED",
"MSG_OUT",
"DATA_IN",
};
static char *NCR_700_fatal_messages[] = {
"unexpected message after reselection",
"still MSG_OUT after message injection",
"not MSG_IN after selection",
"Illegal message length received",
};
static char *NCR_700_SBCL_bits[] = {
"IO ",
"CD ",
"MSG ",
"ATN ",
"SEL ",
"BSY ",
"ACK ",
"REQ ",
};
static char *NCR_700_SBCL_to_phase[] = {
"DATA_OUT",
"DATA_IN",
"CMD_OUT",
"STATE",
"ILLEGAL PHASE",
"ILLEGAL PHASE",
"MSG OUT",
"MSG IN",
};
static __u8 NCR_700_SDTR_msg[] = {
0x01, /* Extended message */
0x03, /* Extended message Length */
0x01, /* SDTR Extended message */
NCR_700_MIN_PERIOD,
NCR_700_MAX_OFFSET
};
/* This translates the SDTR message offset and period to a value
* which can be loaded into the SXFER_REG.
*
* NOTE: According to SCSI-2, the true transfer period (in ns) is
* actually four times this period value */
static inline __u8
NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
__u8 offset, __u8 period)
{
int XFERP;
__u8 min_xferp = (hostdata->chip710
? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
__u8 max_offset = (hostdata->chip710
? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
if(offset == 0)
return 0;
if(period < hostdata->min_period) {
printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
period = hostdata->min_period;
}
XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
if(offset > max_offset) {
printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
offset, max_offset);
offset = max_offset;
}
if(XFERP < min_xferp) {
printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
XFERP, min_xferp);
XFERP = min_xferp;
}
return (offset & 0x0f) | (XFERP & 0x07)<<4;
}
static inline __u8
NCR_700_get_SXFER(struct scsi_device *SDp)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
return NCR_700_offset_period_to_sxfer(hostdata,
spi_offset(SDp->sdev_target),
spi_period(SDp->sdev_target));
}
struct Scsi_Host *
NCR_700_detect(struct scsi_host_template *tpnt,
struct NCR_700_Host_Parameters *hostdata, struct device *dev)
{
dma_addr_t pScript, pSlots;
__u8 *memory;
__u32 *script;
struct Scsi_Host *host;
static int banner = 0;
int j;
if(tpnt->sdev_attrs == NULL)
tpnt->sdev_attrs = NCR_700_dev_attrs;
memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
&pScript, GFP_KERNEL);
if(memory == NULL) {
printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
return NULL;
}
script = (__u32 *)memory;
hostdata->msgin = memory + MSGIN_OFFSET;
hostdata->msgout = memory + MSGOUT_OFFSET;
hostdata->status = memory + STATUS_OFFSET;
/* all of these offsets are L1_CACHE_BYTES separated. It is fatal
* if this isn't sufficient separation to avoid dma flushing issues */
BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
hostdata->dev = dev;
pSlots = pScript + SLOTS_OFFSET;
/* Fill in the missing routines from the host template */
tpnt->queuecommand = NCR_700_queuecommand;
tpnt->eh_abort_handler = NCR_700_abort;
tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
tpnt->eh_host_reset_handler = NCR_700_host_reset;
tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
tpnt->use_clustering = ENABLE_CLUSTERING;
tpnt->slave_configure = NCR_700_slave_configure;
tpnt->slave_destroy = NCR_700_slave_destroy;
tpnt->change_queue_depth = NCR_700_change_queue_depth;
tpnt->change_queue_type = NCR_700_change_queue_type;
if(tpnt->name == NULL)
tpnt->name = "53c700";
if(tpnt->proc_name == NULL)
tpnt->proc_name = "53c700";
host = scsi_host_alloc(tpnt, 4);
if (!host)
return NULL;
memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
* NCR_700_COMMAND_SLOTS_PER_HOST);
for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
- (unsigned long)&hostdata->slots[0].SG[0]);
hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
if(j == 0)
hostdata->free_list = &hostdata->slots[j];
else
hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
hostdata->slots[j].state = NCR_700_SLOT_FREE;
}
for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
script[j] = bS_to_host(SCRIPT[j]);
}
/* adjust all labels to be bus physical */
for(j = 0; j < PATCHES; j++) {
script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
}
/* now patch up fixed addresses. */
script_patch_32(script, MessageLocation,
pScript + MSGOUT_OFFSET);
script_patch_32(script, StatusAddress,
pScript + STATUS_OFFSET);
script_patch_32(script, ReceiveMsgAddress,
pScript + MSGIN_OFFSET);
hostdata->script = script;
hostdata->pScript = pScript;
dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
hostdata->state = NCR_700_HOST_FREE;
hostdata->cmd = NULL;
host->max_id = 7;
host->max_lun = NCR_700_MAX_LUNS;
BUG_ON(NCR_700_transport_template == NULL);
host->transportt = NCR_700_transport_template;
host->unique_id = (unsigned long)hostdata->base;
hostdata->eh_complete = NULL;
host->hostdata[0] = (unsigned long)hostdata;
/* kick the chip */
NCR_700_writeb(0xff, host, CTEST9_REG);
if(hostdata->chip710)
hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
else
hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
if(banner == 0) {
printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By [email protected]\n");
banner = 1;
}
printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
hostdata->chip710 ? "53c710" :
(hostdata->fast ? "53c700-66" : "53c700"),
hostdata->rev, hostdata->differential ?
"(Differential)" : "");
/* reset the chip */
NCR_700_chip_reset(host);
if (scsi_add_host(host, dev)) {
dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
scsi_host_put(host);
return NULL;
}
spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
SPI_SIGNAL_SE;
return host;
}
int
NCR_700_release(struct Scsi_Host *host)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
hostdata->script, hostdata->pScript);
return 1;
}
static inline __u8
NCR_700_identify(int can_disconnect, __u8 lun)
{
return IDENTIFY_BASE |
((can_disconnect) ? 0x40 : 0) |
(lun & NCR_700_LUN_MASK);
}
/*
* Function : static int data_residual (Scsi_Host *host)
*
* Purpose : return residual data count of what's in the chip. If you
* really want to know what this function is doing, it's almost a
* direct transcription of the algorithm described in the 53c710
* guide, except that the DBC and DFIFO registers are only 6 bits
* wide on a 53c700.
*
* Inputs : host - SCSI host */
static inline int
NCR_700_data_residual (struct Scsi_Host *host) {
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
int count, synchronous = 0;
unsigned int ddir;
if(hostdata->chip710) {
count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
(NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
} else {
count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
(NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
}
if(hostdata->fast)
synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
/* get the data direction */
ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
if (ddir) {
/* Receive */
if (synchronous)
count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
else
if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
++count;
} else {
/* Send */
__u8 sstat = NCR_700_readb(host, SSTAT1_REG);
if (sstat & SODL_REG_FULL)
++count;
if (synchronous && (sstat & SODR_REG_FULL))
++count;
}
#ifdef NCR_700_DEBUG
if(count)
printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
#endif
return count;
}
/* print out the SCSI wires and corresponding phase from the SBCL register
* in the chip */
static inline char *
sbcl_to_string(__u8 sbcl)
{
int i;
static char ret[256];
ret[0]='\0';
for(i=0; i<8; i++) {
if((1<<i) & sbcl)
strcat(ret, NCR_700_SBCL_bits[i]);
}
strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
return ret;
}
static inline __u8
bitmap_to_number(__u8 bitmap)
{
__u8 i;
for(i=0; i<8 && !(bitmap &(1<<i)); i++)
;
return i;
}
/* Pull a slot off the free list */
STATIC struct NCR_700_command_slot *
find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
{
struct NCR_700_command_slot *slot = hostdata->free_list;
if(slot == NULL) {
/* sanity check */
if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
return NULL;
}
if(slot->state != NCR_700_SLOT_FREE)
/* should panic! */
printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
hostdata->free_list = slot->ITL_forw;
slot->ITL_forw = NULL;
/* NOTE: set the state to busy here, not queued, since this
* indicates the slot is in use and cannot be run by the IRQ
* finish routine. If we cannot queue the command when it
* is properly build, we then change to NCR_700_SLOT_QUEUED */
slot->state = NCR_700_SLOT_BUSY;
hostdata->command_slot_count++;
return slot;
}
STATIC void
free_slot(struct NCR_700_command_slot *slot,
struct NCR_700_Host_Parameters *hostdata)
{
if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
}
if(slot->state == NCR_700_SLOT_FREE) {
printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
}
slot->resume_offset = 0;
slot->cmnd = NULL;
slot->state = NCR_700_SLOT_FREE;
slot->ITL_forw = hostdata->free_list;
hostdata->free_list = slot;
hostdata->command_slot_count--;
}
/* This routine really does very little. The command is indexed on
the ITL and (if tagged) the ITLQ lists in _queuecommand */
STATIC void
save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, __u32 dsp)
{
/* Its just possible that this gets executed twice */
if(SCp != NULL) {
struct NCR_700_command_slot *slot =
(struct NCR_700_command_slot *)SCp->host_scribble;
slot->resume_offset = dsp;
}
hostdata->state = NCR_700_HOST_FREE;
hostdata->cmd = NULL;
}
STATIC inline void
NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
struct NCR_700_command_slot *slot)
{
if(SCp->sc_data_direction != DMA_NONE &&
SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
if(SCp->use_sg) {
dma_unmap_sg(hostdata->dev, SCp->buffer,
SCp->use_sg, SCp->sc_data_direction);
} else {
dma_unmap_single(hostdata->dev, slot->dma_handle,
SCp->request_bufflen,
SCp->sc_data_direction);
}
}
}
STATIC inline void
NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, int result)
{
hostdata->state = NCR_700_HOST_FREE;
hostdata->cmd = NULL;
if(SCp != NULL) {
struct NCR_700_command_slot *slot =
(struct NCR_700_command_slot *)SCp->host_scribble;
NCR_700_unmap(hostdata, SCp, slot);
dma_unmap_single(hostdata->dev, slot->pCmd,
sizeof(SCp->cmnd), DMA_TO_DEVICE);
if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
#ifdef NCR_700_DEBUG
printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
SCp, SCp->cmnd[7], result);
scsi_print_sense("53c700", SCp);
#endif
/* restore the old result if the request sense was
* successful */
if(result == 0)
result = SCp->cmnd[7];
/* now restore the original command */
memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
sizeof(SCp->data_cmnd));
SCp->request_buffer = SCp->buffer;
SCp->request_bufflen = SCp->bufflen;
SCp->use_sg = SCp->old_use_sg;
SCp->cmd_len = SCp->old_cmd_len;
SCp->sc_data_direction = SCp->sc_old_data_direction;
SCp->underflow = SCp->old_underflow;
}
free_slot(slot, hostdata);
#ifdef NCR_700_DEBUG
if(NCR_700_get_depth(SCp->device) == 0 ||
NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
NCR_700_get_depth(SCp->device));
#endif /* NCR_700_DEBUG */
NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
SCp->host_scribble = NULL;
SCp->result = result;
SCp->scsi_done(SCp);
} else {
printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
}
}
STATIC void
NCR_700_internal_bus_reset(struct Scsi_Host *host)
{
/* Bus reset */
NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
udelay(50);
NCR_700_writeb(0, host, SCNTL1_REG);
}
STATIC void
NCR_700_chip_setup(struct Scsi_Host *host)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
__u32 dcntl_extra = 0;
__u8 min_period;
__u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
if(hostdata->chip710) {
__u8 burst_disable = hostdata->burst_disable
? BURST_DISABLE : 0;
dcntl_extra = COMPAT_700_MODE;
NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
host, DMODE_710_REG);
NCR_700_writeb(burst_disable | (hostdata->differential ?
DIFF : 0), host, CTEST7_REG);
NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
| AUTO_ATN, host, SCNTL0_REG);
} else {
NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
host, DMODE_700_REG);
NCR_700_writeb(hostdata->differential ?
DIFF : 0, host, CTEST7_REG);
if(hostdata->fast) {
/* this is for 700-66, does nothing on 700 */
NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
| GENERATE_RECEIVE_PARITY, host,
CTEST8_REG);
} else {
NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
| PARITY | AUTO_ATN, host, SCNTL0_REG);
}
}
NCR_700_writeb(1 << host->this_id, host, SCID_REG);
NCR_700_writeb(0, host, SBCL_REG);
NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
| RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
if(hostdata->clock > 75) {
printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
/* do the best we can, but the async clock will be out
* of spec: sync divider 2, async divider 3 */
DEBUG(("53c700: sync 2 async 3\n"));
NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock/2;
} else if(hostdata->clock > 50 && hostdata->clock <= 75) {
/* sync divider 1.5, async divider 3 */
DEBUG(("53c700: sync 1.5 async 3\n"));
NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock*2;
hostdata->sync_clock /= 3;
} else if(hostdata->clock > 37 && hostdata->clock <= 50) {
/* sync divider 1, async divider 2 */
DEBUG(("53c700: sync 1 async 2\n"));
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock;
} else if(hostdata->clock > 25 && hostdata->clock <=37) {
/* sync divider 1, async divider 1.5 */
DEBUG(("53c700: sync 1 async 1.5\n"));
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
hostdata->sync_clock = hostdata->clock;
} else {
DEBUG(("53c700: sync 1 async 1\n"));
NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
/* sync divider 1, async divider 1 */
hostdata->sync_clock = hostdata->clock;
}
/* Calculate the actual minimum period that can be supported
* by our synchronous clock speed. See the 710 manual for
* exact details of this calculation which is based on a
* setting of the SXFER register */
min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
hostdata->min_period = NCR_700_MIN_PERIOD;
if(min_period > NCR_700_MIN_PERIOD)
hostdata->min_period = min_period;
}
STATIC void
NCR_700_chip_reset(struct Scsi_Host *host)
{
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)host->hostdata[0];
if(hostdata->chip710) {
NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
udelay(100);
NCR_700_writeb(0, host, ISTAT_REG);
} else {
NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
udelay(100);
NCR_700_writeb(0, host, DCNTL_REG);
}
mdelay(1000);
NCR_700_chip_setup(host);
}
/* The heart of the message processing engine is that the instruction
* immediately after the INT is the normal case (and so must be CLEAR
* ACK). If we want to do something else, we call that routine in
* scripts and set temp to be the normal case + 8 (skipping the CLEAR
* ACK) so that the routine returns correctly to resume its activity
* */
STATIC __u32
process_extended_message(struct Scsi_Host *host,
struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
{
__u32 resume_offset = dsp, temp = dsp + 8;
__u8 pun = 0xff, lun = 0xff;
if(SCp != NULL) {
pun = SCp->device->id;
lun = SCp->device->lun;
}
switch(hostdata->msgin[2]) {
case A_SDTR_MSG:
if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
struct scsi_target *starget = SCp->device->sdev_target;
__u8 period = hostdata->msgin[3];
__u8 offset = hostdata->msgin[4];
if(offset == 0 || period == 0) {
offset = 0;
period = 0;
}
spi_offset(starget) = offset;
spi_period(starget) = period;
if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
spi_display_xfer_agreement(starget);
NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
}
NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
host, SXFER_REG);
} else {
/* SDTR message out of the blue, reject it */
shost_printk(KERN_WARNING, host,
"Unexpected SDTR msg\n");
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->script, MessageCount, 1);
/* SendMsgOut returns, so set up the return
* address */
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
}
break;
case A_WDTR_MSG:
printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
host->host_no, pun, lun);
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->script, MessageCount, 1);
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
break;
default:
printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
host->host_no, pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
spi_print_msg(hostdata->msgin);
printk("\n");
/* just reject it */
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->script, MessageCount, 1);
/* SendMsgOut returns, so set up the return
* address */
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
}
NCR_700_writel(temp, host, TEMP_REG);
return resume_offset;
}
STATIC __u32
process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
{
/* work out where to return to */
__u32 temp = dsp + 8, resume_offset = dsp;
__u8 pun = 0xff, lun = 0xff;
if(SCp != NULL) {
pun = SCp->device->id;
lun = SCp->device->lun;
}
#ifdef NCR_700_DEBUG
printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
spi_print_msg(hostdata->msgin);
printk("\n");
#endif
switch(hostdata->msgin[0]) {
case A_EXTENDED_MSG:
resume_offset = process_extended_message(host, hostdata, SCp,
dsp, dsps);
break;
case A_REJECT_MSG:
if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
/* Rejected our sync negotiation attempt */
spi_period(SCp->device->sdev_target) =
spi_offset(SCp->device->sdev_target) = 0;
NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
} else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
/* rejected our first simple tag message */
scmd_printk(KERN_WARNING, SCp,
"Rejected first tag queue attempt, turning off tag queueing\n");
/* we're done negotiating */
NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
SCp->device->tagged_supported = 0;
scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
} else {
shost_printk(KERN_WARNING, host,
"(%d:%d) Unexpected REJECT Message %s\n",
pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
/* however, just ignore it */
}
break;
case A_PARITY_ERROR_MSG:
printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
pun, lun);
NCR_700_internal_bus_reset(host);
break;
case A_SIMPLE_TAG_MSG:
printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
pun, lun, hostdata->msgin[1],
NCR_700_phase[(dsps & 0xf00) >> 8]);
/* just ignore it */
break;
default:
printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
host->host_no, pun, lun,
NCR_700_phase[(dsps & 0xf00) >> 8]);
spi_print_msg(hostdata->msgin);
printk("\n");
/* just reject it */
hostdata->msgout[0] = A_REJECT_MSG;
dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
script_patch_16(hostdata->script, MessageCount, 1);
/* SendMsgOut returns, so set up the return
* address */
resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
break;
}
NCR_700_writel(temp, host, TEMP_REG);
/* set us up to receive another message */
dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
return resume_offset;
}
STATIC __u32
process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
struct Scsi_Host *host,
struct NCR_700_Host_Parameters *hostdata)
{
__u32 resume_offset = 0;
__u8 pun = 0xff, lun=0xff;
if(SCp != NULL) {
pun = SCp->device->id;
lun = SCp->device->lun;
}
if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
DEBUG((" COMMAND COMPLETE, status=%02x\n",
hostdata->status[0]));
/* OK, if TCQ still under negotiation, we now know it works */
if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
NCR_700_set_tag_neg_state(SCp->device,
NCR_700_FINISHED_TAG_NEGOTIATION);
/* check for contingent allegiance contitions */
if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
struct NCR_700_command_slot *slot =
(struct NCR_700_command_slot *)SCp->host_scribble;
if(SCp->cmnd[0] == REQUEST_SENSE) {
/* OOPS: bad device, returning another
* contingent allegiance condition */
scmd_printk(KERN_ERR, SCp,
"broken device is looping in contingent allegiance: ignoring\n");
NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
} else {
#ifdef NCR_DEBUG
scsi_print_command(SCp);
printk(" cmd %p has status %d, requesting sense\n",
SCp, hostdata->status[0]);
#endif
/* we can destroy the command here
* because the contingent allegiance
* condition will cause a retry which