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/* -*- mode: c; c-basic-offset: 8 -*- */
/* NCR (or Symbios) 53c700 and 53c700-66 Driver
*
* Copyright ( C ) 2001 by James . Bottomley @ HansenPartnership . com
* * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* *
* * 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 0213 9 , 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 10 MHz .
*
* 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 53 c710 chip ( in 53 c700 emulation mode only - - - no
* special 53 c710 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 < rhirst @ linuxcare . com > 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>
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# include <linux/device.h>
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# 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 " ,
} ;
/* 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 ) {
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printk ( KERN_WARNING " 53c700: Period %dns is less than this chip's minimum, setting to %d \n " , period * 4 , NCR_700_MIN_PERIOD * 4 ) ;
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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 ;
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host - > max_id = 8 ;
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host - > max_lun = NCR_700_MAX_LUNS ;
BUG_ON ( NCR_700_transport_template = = NULL ) ;
host - > transportt = NCR_700_transport_template ;
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host - > unique_id = ( unsigned long ) hostdata - > base ;
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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 James.Bottomley@HansenPartnership.com \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 53 c710
* guide , except that the DBC and DFIFO registers are only 6 bits
* wide on a 53 c700 .
*
* 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 */
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shost_printk ( KERN_WARNING , host ,
" Unexpected SDTR msg \n " ) ;
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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 ] ) ;
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spi_print_msg ( hostdata - > msgin ) ;
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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 ] ) ;
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spi_print_msg ( hostdata - > msgin ) ;
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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 */
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scmd_printk ( KERN_WARNING , SCp ,
" Rejected first tag queue attempt, turning off tag queueing \n " ) ;
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/* we're done negotiating */
NCR_700_set_tag_neg_state ( SCp - > device , NCR_700_FINISHED_TAG_NEGOTIATION ) ;
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hostdata - > tag_negotiated & = ~ ( 1 < < scmd_id ( SCp ) ) ;
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SCp - > device - > tagged_supported = 0 ;
scsi_deactivate_tcq ( SCp - > device , host - > cmd_per_lun ) ;
} else {
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shost_printk ( KERN_WARNING , host ,
" (%d:%d) Unexpected REJECT Message %s \n " ,
pun , lun ,
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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 ] ) ;
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spi_print_msg ( hostdata - > msgin ) ;
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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 */
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scmd_printk ( KERN_ERR , SCp ,
" broken device is looping in contingent allegiance: ignoring \n " ) ;
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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
* will re - copy the command from the
* saved data_cmnd . We also unmap any
* data associated with the command
* here */
NCR_700_unmap ( hostdata , SCp , slot ) ;
SCp - > cmnd [ 0 ] = REQUEST_SENSE ;
SCp - > cmnd [ 1 ] = ( SCp - > device - > lun & 0x7 ) < < 5 ;
SCp - > cmnd [ 2 ] = 0 ;
SCp - > cmnd [ 3 ] = 0 ;
SCp - > cmnd [ 4 ] = sizeof ( SCp - > sense_buffer ) ;
SCp - > cmnd [ 5 ] = 0 ;
SCp - > cmd_len = 6 ;
/* Here's a quiet hack: the
* REQUEST_SENSE command is six bytes ,
* so store a flag indicating that
* this was an internal sense request
* and the original status at the end
* of the command */
SCp - > cmnd [ 6 ] = NCR_700_INTERNAL_SENSE_MAGIC ;
SCp - > cmnd [ 7 ] = hostdata - > status [ 0 ] ;
SCp - > use_sg = 0 ;
SCp - > sc_data_direction = DMA_FROM_DEVICE ;
dma_sync_single_for_device ( hostdata - > dev , slot - > pCmd ,
SCp - > cmd_len , DMA_TO_DEVICE ) ;
SCp - > request_bufflen = sizeof ( SCp - > sense_buffer ) ;
slot - > dma_handle = dma_map_single ( hostdata - > dev , SCp - > sense_buffer , sizeof ( SCp - > sense_buffer ) , DMA_FROM_DEVICE ) ;
slot - > SG [ 0 ] . ins = bS_to_host ( SCRIPT_MOVE_DATA_IN | sizeof ( SCp - > sense_buffer ) ) ;
slot - > SG [ 0 ] . pAddr = bS_to_host ( slot - > dma_handle ) ;
slot - > SG [ 1 ] . ins = bS_to_host ( SCRIPT_RETURN ) ;
slot - > SG [ 1 ] . pAddr = 0 ;
slot - > resume_offset = hostdata - > pScript ;
dma_cache_sync ( slot - > SG , sizeof ( slot - > SG [ 0 ] ) * 2 , DMA_TO_DEVICE ) ;
dma_cache_sync ( SCp - > sense_buffer , sizeof ( SCp - > sense_buffer ) , DMA_FROM_DEVICE ) ;
/* queue the command for reissue */
slot - > state = NCR_700_SLOT_QUEUED ;
hostdata - > state = NCR_700_HOST_FREE ;
hostdata - > cmd = NULL ;
}
} else {
// Currently rely on the mid layer evaluation
// of the tag queuing capability
//
//if(status_byte(hostdata->status[0]) == GOOD &&
// SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
// /* Piggy back the tag queueing support
// * on this command */
// dma_sync_single_for_cpu(hostdata->dev,
// slot->dma_handle,
// SCp->request_bufflen,
// DMA_FROM_DEVICE);
// if(((char *)SCp->request_buffer)[7] & 0x02) {
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// scmd_printk(KERN_INFO, SCp,
// "Enabling Tag Command Queuing\n");
// hostdata->tag_negotiated |= (1<<scmd_id(SCp));
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// NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
// } else {
// NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
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// hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
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// }
//}
NCR_700_scsi_done ( hostdata , SCp , hostdata - > status [ 0 ] ) ;
}
} else if ( ( dsps & 0xfffff0f0 ) = = A_UNEXPECTED_PHASE ) {
__u8 i = ( dsps & 0xf00 ) > > 8 ;
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scmd_printk ( KERN_ERR , SCp , " UNEXPECTED PHASE %s (%s) \n " ,
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NCR_700_phase [ i ] ,
sbcl_to_string ( NCR_700_readb ( host , SBCL_REG ) ) ) ;
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scmd_printk ( KERN_ERR , SCp , " len = %d, cmd = " ,
SCp - > cmd_len ) ;
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scsi_print_command ( SCp ) ;
NCR_700_internal_bus_reset ( host ) ;
} else if ( ( dsps & 0xfffff000 ) = = A_FATAL ) {
int i = ( dsps & 0xfff ) ;
printk ( KERN_ERR " scsi%d: (%d:%d) FATAL ERROR: %s \n " ,
host - > host_no , pun , lun , NCR_700_fatal_messages [ i ] ) ;
if ( dsps = = A_FATAL_ILLEGAL_MSG_LENGTH ) {
printk ( KERN_ERR " msg begins %02x %02x \n " ,
hostdata - > msgin [ 0 ] , hostdata - > msgin [ 1 ] ) ;
}
NCR_700_internal_bus_reset ( host ) ;
} else if ( ( dsps & 0xfffff0f0 ) = = A_DISCONNECT ) {
# ifdef NCR_700_DEBUG
__u8 i = ( dsps & 0xf00 ) > > 8 ;
printk ( " scsi%d: (%d:%d), DISCONNECTED (%d) %s \n " ,
host - > host_no , pun , lun ,
i , NCR_700_phase [ i ] ) ;
# endif
save_for_reselection ( hostdata , SCp , dsp ) ;
} else if ( dsps = = A_RESELECTION_IDENTIFIED ) {
__u8 lun ;
struct NCR_700_command_slot * slot ;
__u8 reselection_id = hostdata - > reselection_id ;
struct scsi_device * SDp ;
lun = hostdata - > msgin [ 0 ] & 0x1f ;
hostdata - > reselection_id = 0xff ;
DEBUG ( ( " scsi%d: (%d:%d) RESELECTED! \n " ,
host - > host_no , reselection_id , lun ) ) ;
/* clear the reselection indicator */
SDp = __scsi_device_lookup ( host , 0 , reselection_id , lun ) ;
if ( unlikely ( SDp = = NULL ) ) {
printk ( KERN_ERR " scsi%d: (%d:%d) HAS NO device \n " ,
host - > host_no , reselection_id , lun ) ;
BUG ( ) ;
}
if ( hostdata - > msgin [ 1 ] = = A_SIMPLE_TAG_MSG ) {
struct scsi_cmnd * SCp = scsi_find_tag ( SDp , hostdata - > msgin [ 2 ] ) ;
if ( unlikely ( SCp = = NULL ) ) {
printk ( KERN_ERR " scsi%d: (%d:%d) no saved request for tag %d \n " ,
host - > host_no , reselection_id , lun , hostdata - > msgin [ 2 ] ) ;
BUG ( ) ;
}
slot = ( struct NCR_700_command_slot * ) SCp - > host_scribble ;
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DDEBUG ( KERN_DEBUG , SDp ,
" reselection is tag %d, slot %p(%d) \n " ,
hostdata - > msgin [ 2 ] , slot , slot - > tag ) ;
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} else {
struct scsi_cmnd * SCp = scsi_find_tag ( SDp , SCSI_NO_TAG ) ;
if ( unlikely ( SCp = = NULL ) ) {
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sdev_printk ( KERN_ERR , SDp ,
" no saved request for untagged cmd \n " ) ;
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BUG ( ) ;
}
slot = ( struct NCR_700_command_slot * ) SCp - > host_scribble ;
}
if ( slot = = NULL ) {
printk ( KERN_ERR " scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!! \n " ,
host - > host_no , reselection_id , lun ,
hostdata - > msgin [ 0 ] , hostdata - > msgin [ 1 ] ,
hostdata - > msgin [ 2 ] ) ;
} else {
if ( hostdata - > state ! = NCR_700_HOST_BUSY )
printk ( KERN_ERR " scsi%d: FATAL, host not busy during valid reselection! \n " ,
host - > host_no ) ;
resume_offset = slot - > resume_offset ;
hostdata - > cmd = slot - > cmnd ;
/* re-patch for this command */
script_patch_32_abs ( hostdata - > script , CommandAddress ,
slot - > pCmd ) ;
script_patch_16 ( hostdata - > script ,
CommandCount , slot - > cmnd - > cmd_len ) ;
script_patch_32_abs ( hostdata - > script , SGScriptStartAddress ,
to32bit ( & slot - > pSG [ 0 ] . ins ) ) ;
/* Note: setting SXFER only works if we're
* still in the MESSAGE phase , so it is vital
* that ACK is still asserted when we process
* the reselection message . The resume offset
* should therefore always clear ACK */
NCR_700_writeb ( NCR_700_get_SXFER ( hostdata - > cmd - > device ) ,
host , SXFER_REG ) ;
dma_cache_sync ( hostdata - > msgin ,
MSG_ARRAY_SIZE , DMA_FROM_DEVICE ) ;
dma_cache_sync ( hostdata - > msgout ,
MSG_ARRAY_SIZE , DMA_TO_DEVICE ) ;
/* I'm just being paranoid here, the command should
* already have been flushed from the cache */
dma_cache_sync ( slot - > cmnd - > cmnd ,
slot - > cmnd - > cmd_len , DMA_TO_DEVICE ) ;
}
} else if ( dsps = = A_RESELECTED_DURING_SELECTION ) {
/* This section is full of debugging code because I've
* never managed to reach it . I think what happens is
* that , because the 700 runs with selection
* interrupts enabled the whole time that we take a
* selection interrupt before we manage to get to the
* reselected script interrupt */
__u8 reselection_id = NCR_700_readb ( host , SFBR_REG ) ;
struct NCR_700_command_slot * slot ;
/* Take out our own ID */
reselection_id & = ~ ( 1 < < host - > this_id ) ;
/* I've never seen this happen, so keep this as a printk rather
* than a debug */
printk ( KERN_INFO " scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d \n " ,
host - > host_no , reselection_id , lun , dsp , dsp - hostdata - > pScript , hostdata - > state , hostdata - > command_slot_count ) ;
{
/* FIXME: DEBUGGING CODE */
__u32 SG = ( __u32 ) bS_to_cpu ( hostdata - > script [ A_SGScriptStartAddress_used [ 0 ] ] ) ;
int i ;
for ( i = 0 ; i < NCR_700_COMMAND_SLOTS_PER_HOST ; i + + ) {
if ( SG > = to32bit ( & hostdata - > slots [ i ] . pSG [ 0 ] )
& & SG < = to32bit ( & hostdata - > slots [ i ] . pSG [ NCR_700_SG_SEGMENTS ] ) )
break ;
}
printk ( KERN_INFO " IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x \n " , SG , & hostdata - > slots [ i ] , hostdata - > slots [ i ] . cmnd , hostdata - > slots [ i ] . resume_offset ) ;
SCp = hostdata - > slots [ i ] . cmnd ;
}
if ( SCp ! = NULL ) {
slot = ( struct NCR_700_command_slot * ) SCp - > host_scribble ;
/* change slot from busy to queued to redo command */
slot - > state = NCR_700_SLOT_QUEUED ;
}
hostdata - > cmd = NULL ;
if ( reselection_id = = 0 ) {
if ( hostdata - > reselection_id = = 0xff ) {
printk ( KERN_ERR " scsi%d: Invalid reselection during selection!! \n " , host - > host_no ) ;
return 0 ;
} else {
printk ( KERN_ERR " scsi%d: script reselected and we took a selection interrupt \n " ,
host - > host_no ) ;
reselection_id = hostdata - > reselection_id ;
}
} else {
/* convert to real ID */
reselection_id = bitmap_to_number ( reselection_id ) ;
}
hostdata - > reselection_id = reselection_id ;
/* just in case we have a stale simple tag message, clear it */
hostdata - > msgin [ 1 ] = 0 ;
dma_cache_sync ( hostdata - > msgin ,
MSG_ARRAY_SIZE , DMA_BIDIRECTIONAL ) ;
if ( hostdata - > tag_negotiated & ( 1 < < reselection_id ) ) {
resume_offset = hostdata - > pScript + Ent_GetReselectionWithTag ;
} else {
resume_offset = hostdata - > pScript + Ent_GetReselectionData ;
}
} else if ( dsps = = A_COMPLETED_SELECTION_AS_TARGET ) {
/* we've just disconnected from the bus, do nothing since
* a return here will re - run the queued command slot
* that may have been interrupted by the initial selection */
DEBUG ( ( " SELECTION COMPLETED \n " ) ) ;
} else if ( ( dsps & 0xfffff0f0 ) = = A_MSG_IN ) {
resume_offset = process_message ( host , hostdata , SCp ,
dsp , dsps ) ;
} else if ( ( dsps & 0xfffff000 ) = = 0 ) {
__u8 i = ( dsps & 0xf0 ) > > 4 , j = ( dsps & 0xf00 ) > > 8 ;
printk ( KERN_ERR " scsi%d: (%d:%d), unhandled script condition %s %s at %04x \n " ,
host - > host_no , pun , lun , NCR_700_condition [ i ] ,
NCR_700_phase [ j ] , dsp - hostdata - > pScript ) ;
if ( SCp ! = NULL ) {
scsi_print_command ( SCp ) ;
if ( SCp - > use_sg ) {
for ( i = 0 ; i < SCp - > use_sg + 1 ; i + + ) {
printk ( KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x \n " , i , ( ( struct scatterlist * ) SCp - > buffer ) [ i ] . length , ( ( struct NCR_700_command_slot * ) SCp - > host_scribble ) - > SG [ i ] . ins , ( ( struct NCR_700_command_slot * ) SCp - > host_scribble ) - > SG [ i ] . pAddr ) ;
}
}
}
NCR_700_internal_bus_reset ( host ) ;
} else if ( ( dsps & 0xfffff000 ) = = A_DEBUG_INTERRUPT ) {
printk ( KERN_NOTICE " scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing \n " ,
host - > host_no , pun , lun , dsps & 0xfff , dsp , dsp - hostdata - > pScript ) ;
resume_offset = dsp ;
} else {
printk ( KERN_ERR " scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x \n " ,
host - > host_no , pun , lun , dsps , dsp - hostdata - > pScript ) ;
NCR_700_internal_bus_reset ( host ) ;
}
return resume_offset ;
}
/* We run the 53c700 with selection interrupts always enabled. This
* means that the chip may be selected as soon as the bus frees . On a
* busy bus , this can be before the scripts engine finishes its
* processing . Therefore , part of the selection processing has to be
* to find out what the scripts engine is doing and complete the
* function if necessary ( i . e . process the pending disconnect or save
* the interrupted initial selection */
STATIC inline __u32
process_selection ( struct Scsi_Host * host , __u32 dsp )
{
__u8 id = 0 ; /* Squash compiler warning */
int count = 0 ;
__u32 resume_offset = 0 ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) host - > hostdata [ 0 ] ;
struct scsi_cmnd * SCp = hostdata - > cmd ;
__u8 sbcl ;
for ( count = 0 ; count < 5 ; count + + ) {
id = NCR_700_readb ( host , hostdata - > chip710 ?
CTEST9_REG : SFBR_REG ) ;
/* Take out our own ID */
id & = ~ ( 1 < < host - > this_id ) ;
if ( id ! = 0 )
break ;
udelay ( 5 ) ;
}
sbcl = NCR_700_readb ( host , SBCL_REG ) ;
if ( ( sbcl & SBCL_IO ) = = 0 ) {
/* mark as having been selected rather than reselected */
id = 0xff ;
} else {
/* convert to real ID */
hostdata - > reselection_id = id = bitmap_to_number ( id ) ;
DEBUG ( ( " scsi%d: Reselected by %d \n " ,
host - > host_no , id ) ) ;
}
if ( hostdata - > state = = NCR_700_HOST_BUSY & & SCp ! = NULL ) {
struct NCR_700_command_slot * slot =
( struct NCR_700_command_slot * ) SCp - > host_scribble ;
DEBUG ( ( " ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x! \n " , id , hostdata - > cmd , slot , dsp , dsp - hostdata - > pScript , resume_offset ) ) ;
switch ( dsp - hostdata - > pScript ) {
case Ent_Disconnect1 :
case Ent_Disconnect2 :
save_for_reselection ( hostdata , SCp , Ent_Disconnect2 + hostdata - > pScript ) ;
break ;
case Ent_Disconnect3 :
case Ent_Disconnect4 :
save_for_reselection ( hostdata , SCp , Ent_Disconnect4 + hostdata - > pScript ) ;
break ;
case Ent_Disconnect5 :
case Ent_Disconnect6 :
save_for_reselection ( hostdata , SCp , Ent_Disconnect6 + hostdata - > pScript ) ;
break ;
case Ent_Disconnect7 :
case Ent_Disconnect8 :
save_for_reselection ( hostdata , SCp , Ent_Disconnect8 + hostdata - > pScript ) ;
break ;
case Ent_Finish1 :
case Ent_Finish2 :
process_script_interrupt ( A_GOOD_STATUS_AFTER_STATUS , dsp , SCp , host , hostdata ) ;
break ;
default :
slot - > state = NCR_700_SLOT_QUEUED ;
break ;
}
}
hostdata - > state = NCR_700_HOST_BUSY ;
hostdata - > cmd = NULL ;
/* clear any stale simple tag message */
hostdata - > msgin [ 1 ] = 0 ;
dma_cache_sync ( hostdata - > msgin , MSG_ARRAY_SIZE ,
DMA_BIDIRECTIONAL ) ;
if ( id = = 0xff ) {
/* Selected as target, Ignore */
resume_offset = hostdata - > pScript + Ent_SelectedAsTarget ;
} else if ( hostdata - > tag_negotiated & ( 1 < < id ) ) {
resume_offset = hostdata - > pScript + Ent_GetReselectionWithTag ;
} else {
resume_offset = hostdata - > pScript + Ent_GetReselectionData ;
}
return resume_offset ;
}
static inline void
NCR_700_clear_fifo ( struct Scsi_Host * host ) {
const struct NCR_700_Host_Parameters * hostdata
= ( struct NCR_700_Host_Parameters * ) host - > hostdata [ 0 ] ;
if ( hostdata - > chip710 ) {
NCR_700_writeb ( CLR_FIFO_710 , host , CTEST8_REG ) ;
} else {
NCR_700_writeb ( CLR_FIFO , host , DFIFO_REG ) ;
}
}
static inline void
NCR_700_flush_fifo ( struct Scsi_Host * host ) {
const struct NCR_700_Host_Parameters * hostdata
= ( struct NCR_700_Host_Parameters * ) host - > hostdata [ 0 ] ;
if ( hostdata - > chip710 ) {
NCR_700_writeb ( FLUSH_DMA_FIFO_710 , host , CTEST8_REG ) ;
udelay ( 10 ) ;
NCR_700_writeb ( 0 , host , CTEST8_REG ) ;
} else {
NCR_700_writeb ( FLUSH_DMA_FIFO , host , DFIFO_REG ) ;
udelay ( 10 ) ;
NCR_700_writeb ( 0 , host , DFIFO_REG ) ;
}
}
/* The queue lock with interrupts disabled must be held on entry to
* this function */
STATIC int
NCR_700_start_command ( struct scsi_cmnd * SCp )
{
struct NCR_700_command_slot * slot =
( struct NCR_700_command_slot * ) SCp - > host_scribble ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SCp - > device - > host - > hostdata [ 0 ] ;
__u16 count = 1 ; /* for IDENTIFY message */
if ( hostdata - > state ! = NCR_700_HOST_FREE ) {
/* keep this inside the lock to close the race window where
* the running command finishes on another CPU while we don ' t
* change the state to queued on this one */
slot - > state = NCR_700_SLOT_QUEUED ;
DEBUG ( ( " scsi%d: host busy, queueing command %p, slot %p \n " ,
SCp - > device - > host - > host_no , slot - > cmnd , slot ) ) ;
return 0 ;
}
hostdata - > state = NCR_700_HOST_BUSY ;
hostdata - > cmd = SCp ;
slot - > state = NCR_700_SLOT_BUSY ;
/* keep interrupts disabled until we have the command correctly
* set up so we cannot take a selection interrupt */
hostdata - > msgout [ 0 ] = NCR_700_identify ( SCp - > cmnd [ 0 ] ! = REQUEST_SENSE ,
SCp - > device - > lun ) ;
/* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
* if the negotiated transfer parameters still hold , so
* always renegotiate them */
if ( SCp - > cmnd [ 0 ] = = INQUIRY | | SCp - > cmnd [ 0 ] = = REQUEST_SENSE ) {
NCR_700_clear_flag ( SCp - > device , NCR_700_DEV_NEGOTIATED_SYNC ) ;
}
/* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
* If a contingent allegiance condition exists , the device
* will refuse all tags , so send the request sense as untagged
* */
2005-10-25 00:05:09 +02:00
if ( ( hostdata - > tag_negotiated & ( 1 < < scmd_id ( SCp ) ) )
2005-04-17 00:20:36 +02:00
& & ( slot - > tag ! = SCSI_NO_TAG & & SCp - > cmnd [ 0 ] ! = REQUEST_SENSE ) ) {
count + = scsi_populate_tag_msg ( SCp , & hostdata - > msgout [ count ] ) ;
}
if ( hostdata - > fast & &
NCR_700_is_flag_clear ( SCp - > device , NCR_700_DEV_NEGOTIATED_SYNC ) ) {
2006-02-07 15:54:46 +01:00
count + = spi_populate_sync_msg ( & hostdata - > msgout [ count ] ,
spi_period ( SCp - > device - > sdev_target ) ,
spi_offset ( SCp - > device - > sdev_target ) ) ;
2005-04-17 00:20:36 +02:00
NCR_700_set_flag ( SCp - > device , NCR_700_DEV_BEGIN_SYNC_NEGOTIATION ) ;
}
script_patch_16 ( hostdata - > script , MessageCount , count ) ;
script_patch_ID ( hostdata - > script ,
2005-10-25 00:05:09 +02:00
Device_ID , 1 < < scmd_id ( SCp ) ) ;
2005-04-17 00:20:36 +02:00
script_patch_32_abs ( hostdata - > script , CommandAddress ,
slot - > pCmd ) ;
script_patch_16 ( hostdata - > script , CommandCount , SCp - > cmd_len ) ;
/* finally plumb the beginning of the SG list into the script
* */
script_patch_32_abs ( hostdata - > script , SGScriptStartAddress ,
to32bit ( & slot - > pSG [ 0 ] . ins ) ) ;
NCR_700_clear_fifo ( SCp - > device - > host ) ;
if ( slot - > resume_offset = = 0 )
slot - > resume_offset = hostdata - > pScript ;
/* now perform all the writebacks and invalidates */
dma_cache_sync ( hostdata - > msgout , count , DMA_TO_DEVICE ) ;
dma_cache_sync ( hostdata - > msgin , MSG_ARRAY_SIZE ,
DMA_FROM_DEVICE ) ;
dma_cache_sync ( SCp - > cmnd , SCp - > cmd_len , DMA_TO_DEVICE ) ;
dma_cache_sync ( hostdata - > status , 1 , DMA_FROM_DEVICE ) ;
/* set the synchronous period/offset */
NCR_700_writeb ( NCR_700_get_SXFER ( SCp - > device ) ,
SCp - > device - > host , SXFER_REG ) ;
NCR_700_writel ( slot - > temp , SCp - > device - > host , TEMP_REG ) ;
NCR_700_writel ( slot - > resume_offset , SCp - > device - > host , DSP_REG ) ;
return 1 ;
}
irqreturn_t
NCR_700_intr ( int irq , void * dev_id , struct pt_regs * regs )
{
struct Scsi_Host * host = ( struct Scsi_Host * ) dev_id ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) host - > hostdata [ 0 ] ;
__u8 istat ;
__u32 resume_offset = 0 ;
__u8 pun = 0xff , lun = 0xff ;
unsigned long flags ;
int handled = 0 ;
/* Use the host lock to serialise acess to the 53c700
* hardware . Note : In future , we may need to take the queue
* lock to enter the done routines . When that happens , we
* need to ensure that for this driver , the host lock and the
* queue lock point to the same thing . */
spin_lock_irqsave ( host - > host_lock , flags ) ;
if ( ( istat = NCR_700_readb ( host , ISTAT_REG ) )
& ( SCSI_INT_PENDING | DMA_INT_PENDING ) ) {
__u32 dsps ;
__u8 sstat0 = 0 , dstat = 0 ;
__u32 dsp ;
struct scsi_cmnd * SCp = hostdata - > cmd ;
enum NCR_700_Host_State state ;
handled = 1 ;
state = hostdata - > state ;
SCp = hostdata - > cmd ;
if ( istat & SCSI_INT_PENDING ) {
udelay ( 10 ) ;
sstat0 = NCR_700_readb ( host , SSTAT0_REG ) ;
}
if ( istat & DMA_INT_PENDING ) {
udelay ( 10 ) ;
dstat = NCR_700_readb ( host , DSTAT_REG ) ;
}
dsps = NCR_700_readl ( host , DSPS_REG ) ;
dsp = NCR_700_readl ( host , DSP_REG ) ;
DEBUG ( ( " scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x \n " ,
host - > host_no , istat , sstat0 , dstat ,
( dsp - ( __u32 ) ( hostdata - > pScript ) ) / 4 ,
dsp , dsps ) ) ;
if ( SCp ! = NULL ) {
pun = SCp - > device - > id ;
lun = SCp - > device - > lun ;
}
if ( sstat0 & SCSI_RESET_DETECTED ) {
struct scsi_device * SDp ;
int i ;
hostdata - > state = NCR_700_HOST_BUSY ;
printk ( KERN_ERR " scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x] \n " ,
host - > host_no , SCp , SCp = = NULL ? NULL : SCp - > host_scribble , dsp , dsp - hostdata - > pScript ) ;
scsi_report_bus_reset ( host , 0 ) ;
/* clear all the negotiated parameters */
__shost_for_each_device ( SDp , host )
SDp - > hostdata = NULL ;
/* clear all the slots and their pending commands */
for ( i = 0 ; i < NCR_700_COMMAND_SLOTS_PER_HOST ; i + + ) {
struct scsi_cmnd * SCp ;
struct NCR_700_command_slot * slot =
& hostdata - > slots [ i ] ;
if ( slot - > state = = NCR_700_SLOT_FREE )
continue ;
SCp = slot - > cmnd ;
printk ( KERN_ERR " failing command because of reset, slot %p, cmnd %p \n " ,
slot , SCp ) ;
free_slot ( slot , hostdata ) ;
SCp - > host_scribble = NULL ;
NCR_700_set_depth ( SCp - > device , 0 ) ;
/* NOTE: deadlock potential here: we
* rely on mid - layer guarantees that
* scsi_done won ' t try to issue the
* command again otherwise we ' ll
* deadlock on the
* hostdata - > state_lock */
SCp - > result = DID_RESET < < 16 ;
SCp - > scsi_done ( SCp ) ;
}
mdelay ( 25 ) ;
NCR_700_chip_setup ( host ) ;
hostdata - > state = NCR_700_HOST_FREE ;
hostdata - > cmd = NULL ;
/* signal back if this was an eh induced reset */
if ( hostdata - > eh_complete ! = NULL )
complete ( hostdata - > eh_complete ) ;
goto out_unlock ;
} else if ( sstat0 & SELECTION_TIMEOUT ) {
DEBUG ( ( " scsi%d: (%d:%d) selection timeout \n " ,
host - > host_no , pun , lun ) ) ;
NCR_700_scsi_done ( hostdata , SCp , DID_NO_CONNECT < < 16 ) ;
} else if ( sstat0 & PHASE_MISMATCH ) {
struct NCR_700_command_slot * slot = ( SCp = = NULL ) ? NULL :
( struct NCR_700_command_slot * ) SCp - > host_scribble ;
if ( dsp = = Ent_SendMessage + 8 + hostdata - > pScript ) {
/* It wants to reply to some part of
* our message */
# ifdef NCR_700_DEBUG
__u32 temp = NCR_700_readl ( host , TEMP_REG ) ;
int count = ( hostdata - > script [ Ent_SendMessage / 4 ] & 0xffffff ) - ( ( NCR_700_readl ( host , DBC_REG ) & 0xffffff ) + NCR_700_data_residual ( host ) ) ;
printk ( " scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s \n " , host - > host_no , pun , lun , count , ( void * ) temp , temp - hostdata - > pScript , sbcl_to_string ( NCR_700_readb ( host , SBCL_REG ) ) ) ;
# endif
resume_offset = hostdata - > pScript + Ent_SendMessagePhaseMismatch ;
} else if ( dsp > = to32bit ( & slot - > pSG [ 0 ] . ins ) & &
dsp < = to32bit ( & slot - > pSG [ NCR_700_SG_SEGMENTS ] . ins ) ) {
int data_transfer = NCR_700_readl ( host , DBC_REG ) & 0xffffff ;
int SGcount = ( dsp - to32bit ( & slot - > pSG [ 0 ] . ins ) ) / sizeof ( struct NCR_700_SG_List ) ;
int residual = NCR_700_data_residual ( host ) ;
int i ;
# ifdef NCR_700_DEBUG
__u32 naddr = NCR_700_readl ( host , DNAD_REG ) ;
printk ( " scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x \n " ,
host - > host_no , pun , lun ,
SGcount , data_transfer ) ;
scsi_print_command ( SCp ) ;
if ( residual ) {
printk ( " scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d \n " ,
host - > host_no , pun , lun ,
SGcount , data_transfer , residual ) ;
}
# endif
data_transfer + = residual ;
if ( data_transfer ! = 0 ) {
int count ;
__u32 pAddr ;
SGcount - - ;
count = ( bS_to_cpu ( slot - > SG [ SGcount ] . ins ) & 0x00ffffff ) ;
DEBUG ( ( " DATA TRANSFER MISMATCH, count = %d, transferred %d \n " , count , count - data_transfer ) ) ;
slot - > SG [ SGcount ] . ins & = bS_to_host ( 0xff000000 ) ;
slot - > SG [ SGcount ] . ins | = bS_to_host ( data_transfer ) ;
pAddr = bS_to_cpu ( slot - > SG [ SGcount ] . pAddr ) ;
pAddr + = ( count - data_transfer ) ;
# ifdef NCR_700_DEBUG
if ( pAddr ! = naddr ) {
printk ( " scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d \n " , host - > host_no , pun , lun , ( unsigned long ) pAddr , ( unsigned long ) naddr , data_transfer , residual ) ;
}
# endif
slot - > SG [ SGcount ] . pAddr = bS_to_host ( pAddr ) ;
}
/* set the executed moves to nops */
for ( i = 0 ; i < SGcount ; i + + ) {
slot - > SG [ i ] . ins = bS_to_host ( SCRIPT_NOP ) ;
slot - > SG [ i ] . pAddr = 0 ;
}
dma_cache_sync ( slot - > SG , sizeof ( slot - > SG ) , DMA_TO_DEVICE ) ;
/* and pretend we disconnected after
* the command phase */
resume_offset = hostdata - > pScript + Ent_MsgInDuringData ;
/* make sure all the data is flushed */
NCR_700_flush_fifo ( host ) ;
} else {
__u8 sbcl = NCR_700_readb ( host , SBCL_REG ) ;
printk ( KERN_ERR " scsi%d: (%d:%d) phase mismatch at %04x, phase %s \n " ,
host - > host_no , pun , lun , dsp - hostdata - > pScript , sbcl_to_string ( sbcl ) ) ;
NCR_700_internal_bus_reset ( host ) ;
}
} else if ( sstat0 & SCSI_GROSS_ERROR ) {
printk ( KERN_ERR " scsi%d: (%d:%d) GROSS ERROR \n " ,
host - > host_no , pun , lun ) ;
NCR_700_scsi_done ( hostdata , SCp , DID_ERROR < < 16 ) ;
} else if ( sstat0 & PARITY_ERROR ) {
printk ( KERN_ERR " scsi%d: (%d:%d) PARITY ERROR \n " ,
host - > host_no , pun , lun ) ;
NCR_700_scsi_done ( hostdata , SCp , DID_ERROR < < 16 ) ;
} else if ( dstat & SCRIPT_INT_RECEIVED ) {
DEBUG ( ( " scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<==== \n " ,
host - > host_no , pun , lun ) ) ;
resume_offset = process_script_interrupt ( dsps , dsp , SCp , host , hostdata ) ;
} else if ( dstat & ( ILGL_INST_DETECTED ) ) {
printk ( KERN_ERR " scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!! \n "
" Please email James.Bottomley@HansenPartnership.com with the details \n " ,
host - > host_no , pun , lun ,
dsp , dsp - hostdata - > pScript ) ;
NCR_700_scsi_done ( hostdata , SCp , DID_ERROR < < 16 ) ;
} else if ( dstat & ( WATCH_DOG_INTERRUPT | ABORTED ) ) {
printk ( KERN_ERR " scsi%d: (%d:%d) serious DMA problem, dstat=%02x \n " ,
host - > host_no , pun , lun , dstat ) ;
NCR_700_scsi_done ( hostdata , SCp , DID_ERROR < < 16 ) ;
}
/* NOTE: selection interrupt processing MUST occur
* after script interrupt processing to correctly cope
* with the case where we process a disconnect and
* then get reselected before we process the
* disconnection */
if ( sstat0 & SELECTED ) {
/* FIXME: It currently takes at least FOUR
* interrupts to complete a command that
* disconnects : one for the disconnect , one
* for the reselection , one to get the
* reselection data and one to complete the
* command . If we guess the reselected
* command here and prepare it , we only need
* to get a reselection data interrupt if we
* guessed wrongly . Since the interrupt
* overhead is much greater than the command
* setup , this would be an efficient
* optimisation particularly as we probably
* only have one outstanding command on a
* target most of the time */
resume_offset = process_selection ( host , dsp ) ;
}
}
if ( resume_offset ) {
if ( hostdata - > state ! = NCR_700_HOST_BUSY ) {
printk ( KERN_ERR " scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host! \n " ,
host - > host_no , resume_offset , resume_offset - hostdata - > pScript ) ;
hostdata - > state = NCR_700_HOST_BUSY ;
}
DEBUG ( ( " Attempting to resume at %x \n " , resume_offset ) ) ;
NCR_700_clear_fifo ( host ) ;
NCR_700_writel ( resume_offset , host , DSP_REG ) ;
}
/* There is probably a technical no-no about this: If we're a
* shared interrupt and we got this interrupt because the
* other device needs servicing not us , we ' re still going to
* check our queued commands here - - - of course , there shouldn ' t
* be any outstanding . . . . */
if ( hostdata - > state = = NCR_700_HOST_FREE ) {
int i ;
for ( i = 0 ; i < NCR_700_COMMAND_SLOTS_PER_HOST ; i + + ) {
/* fairness: always run the queue from the last
* position we left off */
int j = ( i + hostdata - > saved_slot_position )
% NCR_700_COMMAND_SLOTS_PER_HOST ;
if ( hostdata - > slots [ j ] . state ! = NCR_700_SLOT_QUEUED )
continue ;
if ( NCR_700_start_command ( hostdata - > slots [ j ] . cmnd ) ) {
DEBUG ( ( " scsi%d: Issuing saved command slot %p, cmd %p \t \n " ,
host - > host_no , & hostdata - > slots [ j ] ,
hostdata - > slots [ j ] . cmnd ) ) ;
hostdata - > saved_slot_position = j + 1 ;
}
break ;
}
}
out_unlock :
spin_unlock_irqrestore ( host - > host_lock , flags ) ;
return IRQ_RETVAL ( handled ) ;
}
STATIC int
NCR_700_queuecommand ( struct scsi_cmnd * SCp , void ( * done ) ( struct scsi_cmnd * ) )
{
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SCp - > device - > host - > hostdata [ 0 ] ;
__u32 move_ins ;
enum dma_data_direction direction ;
struct NCR_700_command_slot * slot ;
if ( hostdata - > command_slot_count > = NCR_700_COMMAND_SLOTS_PER_HOST ) {
/* We're over our allocation, this should never happen
* since we report the max allocation to the mid layer */
printk ( KERN_WARNING " scsi%d: Command depth has gone over queue depth \n " , SCp - > device - > host - > host_no ) ;
return 1 ;
}
/* check for untagged commands. We cannot have any outstanding
* commands if we accept them . Commands could be untagged because :
*
* - The tag negotiated bitmap is clear
* - The blk layer sent and untagged command
*/
if ( NCR_700_get_depth ( SCp - > device ) ! = 0
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& & ( ! ( hostdata - > tag_negotiated & ( 1 < < scmd_id ( SCp ) ) )
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| | ! blk_rq_tagged ( SCp - > request ) ) ) {
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CDEBUG ( KERN_ERR , SCp , " has non zero depth %d \n " ,
NCR_700_get_depth ( SCp - > device ) ) ;
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return SCSI_MLQUEUE_DEVICE_BUSY ;
}
if ( NCR_700_get_depth ( SCp - > device ) > = SCp - > device - > queue_depth ) {
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CDEBUG ( KERN_ERR , SCp , " has max tag depth %d \n " ,
NCR_700_get_depth ( SCp - > device ) ) ;
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return SCSI_MLQUEUE_DEVICE_BUSY ;
}
NCR_700_set_depth ( SCp - > device , NCR_700_get_depth ( SCp - > device ) + 1 ) ;
/* begin the command here */
/* no need to check for NULL, test for command_slot_count above
* ensures a slot is free */
slot = find_empty_slot ( hostdata ) ;
slot - > cmnd = SCp ;
SCp - > scsi_done = done ;
SCp - > host_scribble = ( unsigned char * ) slot ;
SCp - > SCp . ptr = NULL ;
SCp - > SCp . buffer = NULL ;
# ifdef NCR_700_DEBUG
printk ( " 53c700: scsi%d, command " , SCp - > device - > host - > host_no ) ;
scsi_print_command ( SCp ) ;
# endif
if ( blk_rq_tagged ( SCp - > request )
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& & ( hostdata - > tag_negotiated & ( 1 < < scmd_id ( SCp ) ) ) = = 0
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& & NCR_700_get_tag_neg_state ( SCp - > device ) = = NCR_700_START_TAG_NEGOTIATION ) {
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scmd_printk ( KERN_ERR , SCp , " Enabling Tag Command Queuing \n " ) ;
hostdata - > tag_negotiated | = ( 1 < < scmd_id ( SCp ) ) ;
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NCR_700_set_tag_neg_state ( SCp - > device , NCR_700_DURING_TAG_NEGOTIATION ) ;
}
/* here we may have to process an untagged command. The gate
* above ensures that this will be the only one outstanding ,
* so clear the tag negotiated bit .
*
* FIXME : This will royally screw up on multiple LUN devices
* */
if ( ! blk_rq_tagged ( SCp - > request )
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& & ( hostdata - > tag_negotiated & ( 1 < < scmd_id ( SCp ) ) ) ) {
scmd_printk ( KERN_INFO , SCp , " Disabling Tag Command Queuing \n " ) ;
hostdata - > tag_negotiated & = ~ ( 1 < < scmd_id ( SCp ) ) ;
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}
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if ( ( hostdata - > tag_negotiated & ( 1 < < scmd_id ( SCp ) ) )
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& & scsi_get_tag_type ( SCp - > device ) ) {
slot - > tag = SCp - > request - > tag ;
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CDEBUG ( KERN_DEBUG , SCp , " sending out tag %d, slot %p \n " ,
slot - > tag , slot ) ;
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} else {
slot - > tag = SCSI_NO_TAG ;
/* must populate current_cmnd for scsi_find_tag to work */
SCp - > device - > current_cmnd = SCp ;
}
/* sanity check: some of the commands generated by the mid-layer
* have an eccentric idea of their sc_data_direction */
if ( ! SCp - > use_sg & & ! SCp - > request_bufflen
& & SCp - > sc_data_direction ! = DMA_NONE ) {
# ifdef NCR_700_DEBUG
printk ( " 53c700: Command " ) ;
scsi_print_command ( SCp ) ;
printk ( " Has wrong data direction %d \n " , SCp - > sc_data_direction ) ;
# endif
SCp - > sc_data_direction = DMA_NONE ;
}
switch ( SCp - > cmnd [ 0 ] ) {
case REQUEST_SENSE :
/* clear the internal sense magic */
SCp - > cmnd [ 6 ] = 0 ;
/* fall through */
default :
/* OK, get it from the command */
switch ( SCp - > sc_data_direction ) {
case DMA_BIDIRECTIONAL :
default :
printk ( KERN_ERR " 53c700: Unknown command for data direction " ) ;
scsi_print_command ( SCp ) ;
move_ins = 0 ;
break ;
case DMA_NONE :
move_ins = 0 ;
break ;
case DMA_FROM_DEVICE :
move_ins = SCRIPT_MOVE_DATA_IN ;
break ;
case DMA_TO_DEVICE :
move_ins = SCRIPT_MOVE_DATA_OUT ;
break ;
}
}
/* now build the scatter gather list */
direction = SCp - > sc_data_direction ;
if ( move_ins ! = 0 ) {
int i ;
int sg_count ;
dma_addr_t vPtr = 0 ;
__u32 count = 0 ;
if ( SCp - > use_sg ) {
sg_count = dma_map_sg ( hostdata - > dev , SCp - > buffer ,
SCp - > use_sg , direction ) ;
} else {
vPtr = dma_map_single ( hostdata - > dev ,
SCp - > request_buffer ,
SCp - > request_bufflen ,
direction ) ;
count = SCp - > request_bufflen ;
slot - > dma_handle = vPtr ;
sg_count = 1 ;
}
for ( i = 0 ; i < sg_count ; i + + ) {
if ( SCp - > use_sg ) {
struct scatterlist * sg = SCp - > buffer ;
vPtr = sg_dma_address ( & sg [ i ] ) ;
count = sg_dma_len ( & sg [ i ] ) ;
}
slot - > SG [ i ] . ins = bS_to_host ( move_ins | count ) ;
DEBUG ( ( " scatter block %d: move %d[%08x] from 0x%lx \n " ,
i , count , slot - > SG [ i ] . ins , ( unsigned long ) vPtr ) ) ;
slot - > SG [ i ] . pAddr = bS_to_host ( vPtr ) ;
}
slot - > SG [ i ] . ins = bS_to_host ( SCRIPT_RETURN ) ;
slot - > SG [ i ] . pAddr = 0 ;
dma_cache_sync ( slot - > SG , sizeof ( slot - > SG ) , DMA_TO_DEVICE ) ;
DEBUG ( ( " SETTING %08lx to %x \n " ,
( & slot - > pSG [ i ] . ins ) ,
slot - > SG [ i ] . ins ) ) ;
}
slot - > resume_offset = 0 ;
slot - > pCmd = dma_map_single ( hostdata - > dev , SCp - > cmnd ,
sizeof ( SCp - > cmnd ) , DMA_TO_DEVICE ) ;
NCR_700_start_command ( SCp ) ;
return 0 ;
}
STATIC int
NCR_700_abort ( struct scsi_cmnd * SCp )
{
struct NCR_700_command_slot * slot ;
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scmd_printk ( KERN_INFO , SCp ,
" New error handler wants to abort command \n \t " ) ;
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scsi_print_command ( SCp ) ;
slot = ( struct NCR_700_command_slot * ) SCp - > host_scribble ;
if ( slot = = NULL )
/* no outstanding command to abort */
return SUCCESS ;
if ( SCp - > cmnd [ 0 ] = = TEST_UNIT_READY ) {
/* FIXME: This is because of a problem in the new
* error handler . When it is in error recovery , it
* will send a TUR to a device it thinks may still be
* showing a problem . If the TUR isn ' t responded to ,
* it will abort it and mark the device off line .
* Unfortunately , it does no other error recovery , so
* this would leave us with an outstanding command
* occupying a slot . Rather than allow this to
* happen , we issue a bus reset to force all
* outstanding commands to terminate here . */
NCR_700_internal_bus_reset ( SCp - > device - > host ) ;
/* still drop through and return failed */
}
return FAILED ;
}
STATIC int
NCR_700_bus_reset ( struct scsi_cmnd * SCp )
{
DECLARE_COMPLETION ( complete ) ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SCp - > device - > host - > hostdata [ 0 ] ;
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scmd_printk ( KERN_INFO , SCp ,
" New error handler wants BUS reset, cmd %p \n \t " , SCp ) ;
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scsi_print_command ( SCp ) ;
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/* In theory, eh_complete should always be null because the
* eh is single threaded , but just in case we ' re handling a
* reset via sg or something */
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spin_lock_irq ( SCp - > device - > host - > host_lock ) ;
while ( hostdata - > eh_complete ! = NULL ) {
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spin_unlock_irq ( SCp - > device - > host - > host_lock ) ;
msleep_interruptible ( 100 ) ;
spin_lock_irq ( SCp - > device - > host - > host_lock ) ;
}
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hostdata - > eh_complete = & complete ;
NCR_700_internal_bus_reset ( SCp - > device - > host ) ;
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spin_unlock_irq ( SCp - > device - > host - > host_lock ) ;
wait_for_completion ( & complete ) ;
spin_lock_irq ( SCp - > device - > host - > host_lock ) ;
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hostdata - > eh_complete = NULL ;
/* Revalidate the transport parameters of the failing device */
if ( hostdata - > fast )
spi_schedule_dv_device ( SCp - > device ) ;
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spin_unlock_irq ( SCp - > device - > host - > host_lock ) ;
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return SUCCESS ;
}
STATIC int
NCR_700_host_reset ( struct scsi_cmnd * SCp )
{
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scmd_printk ( KERN_INFO , SCp , " New error handler wants HOST reset \n \t " ) ;
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scsi_print_command ( SCp ) ;
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spin_lock_irq ( SCp - > device - > host - > host_lock ) ;
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NCR_700_internal_bus_reset ( SCp - > device - > host ) ;
NCR_700_chip_reset ( SCp - > device - > host ) ;
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spin_unlock_irq ( SCp - > device - > host - > host_lock ) ;
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return SUCCESS ;
}
STATIC void
NCR_700_set_period ( struct scsi_target * STp , int period )
{
struct Scsi_Host * SHp = dev_to_shost ( STp - > dev . parent ) ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SHp - > hostdata [ 0 ] ;
if ( ! hostdata - > fast )
return ;
if ( period < hostdata - > min_period )
period = hostdata - > min_period ;
spi_period ( STp ) = period ;
spi_flags ( STp ) & = ~ ( NCR_700_DEV_NEGOTIATED_SYNC |
NCR_700_DEV_BEGIN_SYNC_NEGOTIATION ) ;
spi_flags ( STp ) | = NCR_700_DEV_PRINT_SYNC_NEGOTIATION ;
}
STATIC void
NCR_700_set_offset ( struct scsi_target * STp , int offset )
{
struct Scsi_Host * SHp = dev_to_shost ( STp - > dev . parent ) ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SHp - > hostdata [ 0 ] ;
int max_offset = hostdata - > chip710
? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET ;
if ( ! hostdata - > fast )
return ;
if ( offset > max_offset )
offset = max_offset ;
/* if we're currently async, make sure the period is reasonable */
if ( spi_offset ( STp ) = = 0 & & ( spi_period ( STp ) < hostdata - > min_period | |
spi_period ( STp ) > 0xff ) )
spi_period ( STp ) = hostdata - > min_period ;
spi_offset ( STp ) = offset ;
spi_flags ( STp ) & = ~ ( NCR_700_DEV_NEGOTIATED_SYNC |
NCR_700_DEV_BEGIN_SYNC_NEGOTIATION ) ;
spi_flags ( STp ) | = NCR_700_DEV_PRINT_SYNC_NEGOTIATION ;
}
STATIC int
NCR_700_slave_configure ( struct scsi_device * SDp )
{
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SDp - > host - > hostdata [ 0 ] ;
/* to do here: allocate memory; build a queue_full list */
if ( SDp - > tagged_supported ) {
scsi_set_tag_type ( SDp , MSG_ORDERED_TAG ) ;
scsi_activate_tcq ( SDp , NCR_700_DEFAULT_TAGS ) ;
NCR_700_set_tag_neg_state ( SDp , NCR_700_START_TAG_NEGOTIATION ) ;
} else {
/* initialise to default depth */
scsi_adjust_queue_depth ( SDp , 0 , SDp - > host - > cmd_per_lun ) ;
}
if ( hostdata - > fast ) {
/* Find the correct offset and period via domain validation */
if ( ! spi_initial_dv ( SDp - > sdev_target ) )
spi_dv_device ( SDp ) ;
} else {
spi_offset ( SDp - > sdev_target ) = 0 ;
spi_period ( SDp - > sdev_target ) = 0 ;
}
return 0 ;
}
STATIC void
NCR_700_slave_destroy ( struct scsi_device * SDp )
{
/* to do here: deallocate memory */
}
static int
NCR_700_change_queue_depth ( struct scsi_device * SDp , int depth )
{
if ( depth > NCR_700_MAX_TAGS )
depth = NCR_700_MAX_TAGS ;
scsi_adjust_queue_depth ( SDp , scsi_get_tag_type ( SDp ) , depth ) ;
return depth ;
}
static int NCR_700_change_queue_type ( struct scsi_device * SDp , int tag_type )
{
int change_tag = ( ( tag_type = = 0 & & scsi_get_tag_type ( SDp ) ! = 0 )
| | ( tag_type ! = 0 & & scsi_get_tag_type ( SDp ) = = 0 ) ) ;
struct NCR_700_Host_Parameters * hostdata =
( struct NCR_700_Host_Parameters * ) SDp - > host - > hostdata [ 0 ] ;
scsi_set_tag_type ( SDp , tag_type ) ;
/* We have a global (per target) flag to track whether TCQ is
* enabled , so we ' ll be turning it off for the entire target here .
* our tag algorithm will fail if we mix tagged and untagged commands ,
* so quiesce the device before doing this */
if ( change_tag )
scsi_target_quiesce ( SDp - > sdev_target ) ;
if ( ! tag_type ) {
/* shift back to the default unqueued number of commands
* ( the user can still raise this ) */
scsi_deactivate_tcq ( SDp , SDp - > host - > cmd_per_lun ) ;
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hostdata - > tag_negotiated & = ~ ( 1 < < sdev_id ( SDp ) ) ;
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} else {
/* Here, we cleared the negotiation flag above, so this
* will force the driver to renegotiate */
scsi_activate_tcq ( SDp , SDp - > queue_depth ) ;
if ( change_tag )
NCR_700_set_tag_neg_state ( SDp , NCR_700_START_TAG_NEGOTIATION ) ;
}
if ( change_tag )
scsi_target_resume ( SDp - > sdev_target ) ;
return tag_type ;
}
static ssize_t
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NCR_700_show_active_tags ( struct device * dev , struct device_attribute * attr , char * buf )
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{
struct scsi_device * SDp = to_scsi_device ( dev ) ;
return snprintf ( buf , 20 , " %d \n " , NCR_700_get_depth ( SDp ) ) ;
}
static struct device_attribute NCR_700_active_tags_attr = {
. attr = {
. name = " active_tags " ,
. mode = S_IRUGO ,
} ,
. show = NCR_700_show_active_tags ,
} ;
STATIC struct device_attribute * NCR_700_dev_attrs [ ] = {
& NCR_700_active_tags_attr ,
NULL ,
} ;
EXPORT_SYMBOL ( NCR_700_detect ) ;
EXPORT_SYMBOL ( NCR_700_release ) ;
EXPORT_SYMBOL ( NCR_700_intr ) ;
static struct spi_function_template NCR_700_transport_functions = {
. set_period = NCR_700_set_period ,
. show_period = 1 ,
. set_offset = NCR_700_set_offset ,
. show_offset = 1 ,
} ;
static int __init NCR_700_init ( void )
{
NCR_700_transport_template = spi_attach_transport ( & NCR_700_transport_functions ) ;
if ( ! NCR_700_transport_template )
return - ENODEV ;
return 0 ;
}
static void __exit NCR_700_exit ( void )
{
spi_release_transport ( NCR_700_transport_template ) ;
}
module_init ( NCR_700_init ) ;
module_exit ( NCR_700_exit ) ;