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u-boot/drivers/sym53c8xx.c

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/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
* partly derived from
* linux/drivers/scsi/sym53c8xx.c
*
*/
/*
* SCSI support based on the chip sym53C810.
*
* 09-19-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
* The local version of this driver for the BAB750 board does not
* use interrupts but polls the chip instead (see the call of
* 'handle_scsi_int()' in 'scsi_issue()'.
*/
#include <common.h>
#ifdef CONFIG_SCSI_SYM53C8XX
#include <command.h>
#include <pci.h>
#include <asm/processor.h>
#include <sym53c8xx.h>
#include <scsi.h>
#undef SYM53C8XX_DEBUG
#ifdef SYM53C8XX_DEBUG
#define PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif
#if defined(CONFIG_CMD_SCSI) && defined(CONFIG_SCSI_SYM53C8XX)
#undef SCSI_SINGLE_STEP
/*
* Single Step is only used for debug purposes
*/
#ifdef SCSI_SINGLE_STEP
static unsigned long start_script_select;
static unsigned long start_script_msgout;
static unsigned long start_script_msgin;
static unsigned long start_script_msg_ext;
static unsigned long start_script_cmd;
static unsigned long start_script_data_in;
static unsigned long start_script_data_out;
static unsigned long start_script_status;
static unsigned long start_script_complete;
static unsigned long start_script_error;
static unsigned long start_script_reselection;
static unsigned int len_script_select;
static unsigned int len_script_msgout;
static unsigned int len_script_msgin;
static unsigned int len_script_msg_ext;
static unsigned int len_script_cmd;
static unsigned int len_script_data_in;
static unsigned int len_script_data_out;
static unsigned int len_script_status;
static unsigned int len_script_complete;
static unsigned int len_script_error;
static unsigned int len_script_reselection;
#endif
static unsigned short scsi_int_mask; /* shadow register for SCSI related interrupts */
static unsigned char script_int_mask; /* shadow register for SCRIPT related interrupts */
static unsigned long script_select[8]; /* script for selection */
static unsigned long script_msgout[8]; /* script for message out phase (NOT USED) */
static unsigned long script_msgin[14]; /* script for message in phase */
static unsigned long script_msg_ext[32]; /* script for message in phase when more than 1 byte message */
static unsigned long script_cmd[18]; /* script for command phase */
static unsigned long script_data_in[8]; /* script for data in phase */
static unsigned long script_data_out[8]; /* script for data out phase */
static unsigned long script_status[6]; /* script for status phase */
static unsigned long script_complete[10]; /* script for complete */
static unsigned long script_reselection[4]; /* script for reselection (NOT USED) */
static unsigned long script_error[2]; /* script for error handling */
static unsigned long int_stat[3]; /* interrupt status */
static unsigned long scsi_mem_addr; /* base memory address =SCSI_MEM_ADDRESS; */
#define bus_to_phys(a) pci_mem_to_phys(busdevfunc, (unsigned long) (a))
#define phys_to_bus(a) pci_phys_to_mem(busdevfunc, (unsigned long) (a))
#define SCSI_MAX_RETRY 3 /* number of retries in scsi_issue() */
#define SCSI_MAX_RETRY_NOT_READY 10 /* number of retries when device is not ready */
#define SCSI_NOT_READY_TIME_OUT 500 /* timeout per retry when not ready */
/*********************************************************************************
* forward declerations
*/
void scsi_chip_init(void);
void handle_scsi_int(void);
/********************************************************************************
* reports SCSI errors to the user
*/
void scsi_print_error(ccb *pccb)
{
int i;
printf("SCSI Error: Target %d LUN %d Command %02X\n",pccb->target, pccb->lun, pccb->cmd[0]);
printf(" CCB: ");
for(i=0;i<pccb->cmdlen;i++)
printf("%02X ",pccb->cmd[i]);
printf("(len=%d)\n",pccb->cmdlen);
printf(" Cntrl: ");
switch(pccb->contr_stat) {
case SIR_COMPLETE: printf("Complete (no Error)\n"); break;
case SIR_SEL_ATN_NO_MSG_OUT: printf("Selected with ATN no MSG out phase\n"); break;
case SIR_CMD_OUT_ILL_PH: printf("Command out illegal phase\n"); break;
case SIR_MSG_RECEIVED: printf("MSG received Error\n"); break;
case SIR_DATA_IN_ERR: printf("Data in Error\n"); break;
case SIR_DATA_OUT_ERR: printf("Data out Error\n"); break;
case SIR_SCRIPT_ERROR: printf("Script Error\n"); break;
case SIR_MSG_OUT_NO_CMD: printf("MSG out no Command phase\n"); break;
case SIR_MSG_OVER7: printf("MSG in over 7 bytes\n"); break;
case INT_ON_FY: printf("Interrupt on fly\n"); break;
case SCSI_SEL_TIME_OUT: printf("SCSI Selection Timeout\n"); break;
case SCSI_HNS_TIME_OUT: printf("SCSI Handshake Timeout\n"); break;
case SCSI_MA_TIME_OUT: printf("SCSI Phase Error\n"); break;
case SCSI_UNEXP_DIS: printf("SCSI unexpected disconnect\n"); break;
default: printf("unknown status %lx\n",pccb->contr_stat); break;
}
printf(" Sense: SK %x (",pccb->sense_buf[2]&0x0f);
switch(pccb->sense_buf[2]&0xf) {
case SENSE_NO_SENSE: printf("No Sense)"); break;
case SENSE_RECOVERED_ERROR: printf("Recovered Error)"); break;
case SENSE_NOT_READY: printf("Not Ready)"); break;
case SENSE_MEDIUM_ERROR: printf("Medium Error)"); break;
case SENSE_HARDWARE_ERROR: printf("Hardware Error)"); break;
case SENSE_ILLEGAL_REQUEST: printf("Illegal request)"); break;
case SENSE_UNIT_ATTENTION: printf("Unit Attention)"); break;
case SENSE_DATA_PROTECT: printf("Data Protect)"); break;
case SENSE_BLANK_CHECK: printf("Blank check)"); break;
case SENSE_VENDOR_SPECIFIC: printf("Vendor specific)"); break;
case SENSE_COPY_ABORTED: printf("Copy aborted)"); break;
case SENSE_ABORTED_COMMAND: printf("Aborted Command)"); break;
case SENSE_VOLUME_OVERFLOW: printf("Volume overflow)"); break;
case SENSE_MISCOMPARE: printf("Misscompare\n"); break;
default: printf("Illegal Sensecode\n"); break;
}
printf(" ASC %x ASCQ %x\n",pccb->sense_buf[12],pccb->sense_buf[13]);
printf(" Status: ");
switch(pccb->status) {
case S_GOOD : printf("Good\n"); break;
case S_CHECK_COND: printf("Check condition\n"); break;
case S_COND_MET: printf("Condition Met\n"); break;
case S_BUSY: printf("Busy\n"); break;
case S_INT: printf("Intermediate\n"); break;
case S_INT_COND_MET: printf("Intermediate condition met\n"); break;
case S_CONFLICT: printf("Reservation conflict\n"); break;
case S_TERMINATED: printf("Command terminated\n"); break;
case S_QUEUE_FULL: printf("Task set full\n"); break;
default: printf("unknown: %02X\n",pccb->status); break;
}
}
/******************************************************************************
* sets-up the SCSI controller
* the base memory address is retrived via the pci_read_config_dword
*/
void scsi_low_level_init(int busdevfunc)
{
unsigned int cmd;
unsigned int addr;
unsigned char vec;
pci_read_config_byte(busdevfunc, PCI_INTERRUPT_LINE, &vec);
pci_read_config_dword(busdevfunc, PCI_BASE_ADDRESS_1, &addr);
addr = bus_to_phys(addr & ~0xf);
/*
* Enable bus mastering in case this has not been done, yet.
*/
pci_read_config_dword(busdevfunc, PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_MASTER;
pci_write_config_dword(busdevfunc, PCI_COMMAND, cmd);
scsi_mem_addr = addr;
scsi_chip_init();
scsi_bus_reset();
}
/************************************************************************************
* Low level Part of SCSI Driver
*/
/*
* big-endian -> little endian conversion for the script
*/
unsigned long swap_script(unsigned long val)
{
unsigned long tmp;
tmp = ((val>>24)&0xff) | ((val>>8)&0xff00) | ((val<<8)&0xff0000) | ((val<<24)&0xff000000);
return tmp;
}
void scsi_write_byte(ulong offset,unsigned char val)
{
out8(scsi_mem_addr+offset,val);
}
unsigned char scsi_read_byte(ulong offset)
{
return(in8(scsi_mem_addr+offset));
}
/********************************************************************************
* interrupt handler
*/
void handle_scsi_int(void)
{
unsigned char stat,stat1,stat2;
unsigned short sstat;
int i;
#ifdef SCSI_SINGLE_STEP
unsigned long tt;
#endif
stat=scsi_read_byte(ISTAT);
if((stat & DIP)==DIP) { /* DMA Interrupt pending */
stat1=scsi_read_byte(DSTAT);
#ifdef SCSI_SINGLE_STEP
if((stat1 & SSI)==SSI)
{
tt=in32r(scsi_mem_addr+DSP);
if(((tt)>=start_script_select) && ((tt)<start_script_select+len_script_select)) {
printf("select %d\n",(tt-start_script_select)>>2);
goto end_single;
}
if(((tt)>=start_script_msgout) && ((tt)<start_script_msgout+len_script_msgout)) {
printf("msgout %d\n",(tt-start_script_msgout)>>2);
goto end_single;
}
if(((tt)>=start_script_msgin) && ((tt)<start_script_msgin+len_script_msgin)) {
printf("msgin %d\n",(tt-start_script_msgin)>>2);
goto end_single;
}
if(((tt)>=start_script_msg_ext) && ((tt)<start_script_msg_ext+len_script_msg_ext)) {
printf("msgin_ext %d\n",(tt-start_script_msg_ext)>>2);
goto end_single;
}
if(((tt)>=start_script_cmd) && ((tt)<start_script_cmd+len_script_cmd)) {
printf("cmd %d\n",(tt-start_script_cmd)>>2);
goto end_single;
}
if(((tt)>=start_script_data_in) && ((tt)<start_script_data_in+len_script_data_in)) {
printf("data_in %d\n",(tt-start_script_data_in)>>2);
goto end_single;
}
if(((tt)>=start_script_data_out) && ((tt)<start_script_data_out+len_script_data_out)) {
printf("data_out %d\n",(tt-start_script_data_out)>>2);
goto end_single;
}
if(((tt)>=start_script_status) && ((tt)<start_script_status+len_script_status)) {
printf("status %d\n",(tt-start_script_status)>>2);
goto end_single;
}
if(((tt)>=start_script_complete) && ((tt)<start_script_complete+len_script_complete)) {
printf("complete %d\n",(tt-start_script_complete)>>2);
goto end_single;
}
if(((tt)>=start_script_error) && ((tt)<start_script_error+len_script_error)) {
printf("error %d\n",(tt-start_script_error)>>2);
goto end_single;
}
if(((tt)>=start_script_reselection) && ((tt)<start_script_reselection+len_script_reselection)) {
printf("reselection %d\n",(tt-start_script_reselection)>>2);
goto end_single;
}
printf("sc: %lx\n",tt);
end_single:
stat2=scsi_read_byte(DCNTL);
stat2|=STD;
scsi_write_byte(DCNTL,stat2);
}
#endif
if((stat1 & SIR)==SIR) /* script interrupt */
{
int_stat[0]=in32(scsi_mem_addr+DSPS);
}
if((stat1 & DFE)==0) { /* fifo not epmty */
scsi_write_byte(CTEST3,CLF); /* Clear DMA FIFO */
stat2=scsi_read_byte(STEST3);
scsi_write_byte(STEST3,(stat2 | CSF)); /* Clear SCSI FIFO */
}
}
if((stat & SIP)==SIP) { /* scsi interrupt */
sstat = (unsigned short)scsi_read_byte(SIST+1);
sstat <<=8;
sstat |= (unsigned short)scsi_read_byte(SIST);
for(i=0;i<3;i++) {
if(int_stat[i]==0)
break; /* found an empty int status */
}
int_stat[i]=SCSI_INT_STATE | sstat;
stat1=scsi_read_byte(DSTAT);
if((stat1 & DFE)==0) { /* fifo not epmty */
scsi_write_byte(CTEST3,CLF); /* Clear DMA FIFO */
stat2=scsi_read_byte(STEST3);
scsi_write_byte(STEST3,(stat2 | CSF)); /* Clear SCSI FIFO */
}
}
if((stat & INTF)==INTF) { /* interrupt on Fly */
scsi_write_byte(ISTAT,stat); /* clear it */
for(i=0;i<3;i++) {
if(int_stat[i]==0)
break; /* found an empty int status */
}
int_stat[i]=INT_ON_FY;
}
}
void scsi_bus_reset(void)
{
unsigned char t;
int i;
int end = CFG_SCSI_SPIN_UP_TIME*1000;
t=scsi_read_byte(SCNTL1);
scsi_write_byte(SCNTL1,(t | CRST));
udelay(50);
scsi_write_byte(SCNTL1,t);
puts("waiting for devices to spin up");
for(i=0;i<end;i++) {
udelay(1000); /* give the devices time to spin up */
if (i % 1000 == 0)
putc('.');
}
putc('\n');
scsi_chip_init(); /* reinit the chip ...*/
}
void scsi_int_enable(void)
{
scsi_write_byte(SIEN,(unsigned char)scsi_int_mask);
scsi_write_byte(SIEN+1,(unsigned char)(scsi_int_mask>>8));
scsi_write_byte(DIEN,script_int_mask);
}
void scsi_write_dsp(unsigned long start)
{
unsigned long val;
#ifdef SCSI_SINGLE_STEP
unsigned char t;
#endif
val = start;
out32r(scsi_mem_addr + DSP,start);
#ifdef SCSI_SINGLE_STEP
t=scsi_read_byte(DCNTL);
t|=STD;
scsi_write_byte(DCNTL,t);
#endif
}
/* only used for debug purposes */
void scsi_print_script(void)
{
printf("script_select @ 0x%08lX\n",(unsigned long)&script_select[0]);
printf("script_msgout @ 0x%08lX\n",(unsigned long)&script_msgout[0]);
printf("script_msgin @ 0x%08lX\n",(unsigned long)&script_msgin[0]);
printf("script_msgext @ 0x%08lX\n",(unsigned long)&script_msg_ext[0]);
printf("script_cmd @ 0x%08lX\n",(unsigned long)&script_cmd[0]);
printf("script_data_in @ 0x%08lX\n",(unsigned long)&script_data_in[0]);
printf("script_data_out @ 0x%08lX\n",(unsigned long)&script_data_out[0]);
printf("script_status @ 0x%08lX\n",(unsigned long)&script_status[0]);
printf("script_complete @ 0x%08lX\n",(unsigned long)&script_complete[0]);
printf("script_error @ 0x%08lX\n",(unsigned long)&script_error[0]);
}
void scsi_set_script(ccb *pccb)
{
int busdevfunc = pccb->priv;
int i;
i=0;
script_select[i++]=swap_script(SCR_REG_REG(GPREG, SCR_AND, 0xfe));
script_select[i++]=0; /* LED ON */
script_select[i++]=swap_script(SCR_CLR(SCR_TRG)); /* select initiator mode */
script_select[i++]=0;
/* script_select[i++]=swap_script(SCR_SEL_ABS_ATN | pccb->target << 16); */
script_select[i++]=swap_script(SCR_SEL_ABS | pccb->target << 16);
script_select[i++]=swap_script(phys_to_bus(&script_cmd[4])); /* error handling */
script_select[i++]=swap_script(SCR_JUMP); /* next section */
/* script_select[i++]=swap_script((unsigned long)&script_msgout[0]); */ /* message out */
script_select[i++]=swap_script(phys_to_bus(&script_cmd[0])); /* command out */
#ifdef SCSI_SINGLE_STEP
start_script_select=(unsigned long)&script_select[0];
len_script_select=i*4;
#endif
i=0;
script_msgout[i++]=swap_script(SCR_INT ^ IFFALSE (WHEN (SCR_MSG_OUT)));
script_msgout[i++]=SIR_SEL_ATN_NO_MSG_OUT;
script_msgout[i++]=swap_script( SCR_MOVE_ABS(1) ^ SCR_MSG_OUT);
script_msgout[i++]=swap_script(phys_to_bus(&pccb->msgout[0]));
script_msgout[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_COMMAND))); /* if Command phase */
script_msgout[i++]=swap_script(phys_to_bus(&script_cmd[0])); /* switch to command */
script_msgout[i++]=swap_script(SCR_INT); /* interrupt if not */
script_msgout[i++]=SIR_MSG_OUT_NO_CMD;
#ifdef SCSI_SINGLE_STEP
start_script_msgout=(unsigned long)&script_msgout[0];
len_script_msgout=i*4;
#endif
i=0;
script_cmd[i++]=swap_script(SCR_MOVE_ABS(pccb->cmdlen) ^ SCR_COMMAND);
script_cmd[i++]=swap_script(phys_to_bus(&pccb->cmd[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN))); /* message in ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_msgin[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_DATA_OUT))); /* data out ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_data_out[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_DATA_IN))); /* data in ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_data_in[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_STATUS))); /* status ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_status[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND))); /* command ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_cmd[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT))); /* message out ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_msgout[0]));
script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_MSG_IN))); /* just for error handling message in ? */
script_cmd[i++]=swap_script(phys_to_bus(&script_msgin[0]));
script_cmd[i++]=swap_script(SCR_INT); /* interrupt if not */
script_cmd[i++]=SIR_CMD_OUT_ILL_PH;
#ifdef SCSI_SINGLE_STEP
start_script_cmd=(unsigned long)&script_cmd[0];
len_script_cmd=i*4;
#endif
i=0;
script_data_out[i++]=swap_script(SCR_MOVE_ABS(pccb->datalen)^ SCR_DATA_OUT); /* move */
script_data_out[i++]=swap_script(phys_to_bus(pccb->pdata)); /* pointer to buffer */
script_data_out[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_STATUS)));
script_data_out[i++]=swap_script(phys_to_bus(&script_status[0]));
script_data_out[i++]=swap_script(SCR_INT);
script_data_out[i++]=SIR_DATA_OUT_ERR;
#ifdef SCSI_SINGLE_STEP
start_script_data_out=(unsigned long)&script_data_out[0];
len_script_data_out=i*4;
#endif
i=0;
script_data_in[i++]=swap_script(SCR_MOVE_ABS(pccb->datalen)^ SCR_DATA_IN); /* move */
script_data_in[i++]=swap_script(phys_to_bus(pccb->pdata)); /* pointer to buffer */
script_data_in[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_STATUS)));
script_data_in[i++]=swap_script(phys_to_bus(&script_status[0]));
script_data_in[i++]=swap_script(SCR_INT);
script_data_in[i++]=SIR_DATA_IN_ERR;
#ifdef SCSI_SINGLE_STEP
start_script_data_in=(unsigned long)&script_data_in[0];
len_script_data_in=i*4;
#endif
i=0;
script_msgin[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN);
script_msgin[i++]=swap_script(phys_to_bus(&pccb->msgin[0]));
script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_COMPLETE)));
script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_DISCONNECT)));
script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_SAVE_DP)));
script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_RESTORE_DP)));
script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_EXTENDED)));
script_msgin[i++]=swap_script(phys_to_bus(&script_msg_ext[0]));
script_msgin[i++]=swap_script(SCR_INT);
script_msgin[i++]=SIR_MSG_RECEIVED;
#ifdef SCSI_SINGLE_STEP
start_script_msgin=(unsigned long)&script_msgin[0];
len_script_msgin=i*4;
#endif
i=0;
script_msg_ext[i++]=swap_script(SCR_CLR (SCR_ACK)); /* clear ACK */
script_msg_ext[i++]=0;
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* assuming this is the msg length */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[1]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[2]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[3]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[4]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[5]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[6]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[7]));
script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
script_msg_ext[i++]=swap_script(SCR_INT);
script_msg_ext[i++]=SIR_MSG_OVER7;
#ifdef SCSI_SINGLE_STEP
start_script_msg_ext=(unsigned long)&script_msg_ext[0];
len_script_msg_ext=i*4;
#endif
i=0;
script_status[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_STATUS);
script_status[i++]=swap_script(phys_to_bus(&pccb->status));
script_status[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)));
script_status[i++]=swap_script(phys_to_bus(&script_msgin[0]));
script_status[i++]=swap_script(SCR_INT);
script_status[i++]=SIR_STATUS_ILL_PH;
#ifdef SCSI_SINGLE_STEP
start_script_status=(unsigned long)&script_status[0];
len_script_status=i*4;
#endif
i=0;
script_complete[i++]=swap_script(SCR_REG_REG (SCNTL2, SCR_AND, 0x7f));
script_complete[i++]=0;
script_complete[i++]=swap_script(SCR_CLR (SCR_ACK|SCR_ATN));
script_complete[i++]=0;
script_complete[i++]=swap_script(SCR_WAIT_DISC);
script_complete[i++]=0;
script_complete[i++]=swap_script(SCR_REG_REG(GPREG, SCR_OR, 0x01));
script_complete[i++]=0; /* LED OFF */
script_complete[i++]=swap_script(SCR_INT);
script_complete[i++]=SIR_COMPLETE;
#ifdef SCSI_SINGLE_STEP
start_script_complete=(unsigned long)&script_complete[0];
len_script_complete=i*4;
#endif
i=0;
script_error[i++]=swap_script(SCR_INT); /* interrupt if error */
script_error[i++]=SIR_SCRIPT_ERROR;
#ifdef SCSI_SINGLE_STEP
start_script_error=(unsigned long)&script_error[0];
len_script_error=i*4;
#endif
i=0;
script_reselection[i++]=swap_script(SCR_CLR (SCR_TRG)); /* target status */
script_reselection[i++]=0;
script_reselection[i++]=swap_script(SCR_WAIT_RESEL);
script_reselection[i++]=swap_script(phys_to_bus(&script_select[0])); /* len = 4 */
#ifdef SCSI_SINGLE_STEP
start_script_reselection=(unsigned long)&script_reselection[0];
len_script_reselection=i*4;
#endif
}
void scsi_issue(ccb *pccb)
{
int busdevfunc = pccb->priv;
int i;
unsigned short sstat;
int retrycnt; /* retry counter */
for(i=0;i<3;i++)
int_stat[i]=0; /* delete all int status */
/* struct pccb must be set-up correctly */
retrycnt=0;
PRINTF("ID %d issue cmd %02X\n",pccb->target,pccb->cmd[0]);
pccb->trans_bytes=0; /* no bytes transfered yet */
scsi_set_script(pccb); /* fill in SCRIPT */
scsi_int_mask=STO | UDC | MA; /* | CMP; / * Interrupts which are enabled */
script_int_mask=0xff; /* enable all Ints */
scsi_int_enable();
scsi_write_dsp(phys_to_bus(&script_select[0])); /* start script */
/* now we have to wait for IRQs */
retry:
/*
* This version of the driver is _not_ interrupt driven,
* but polls the chip's interrupt registers (ISTAT, DSTAT).
*/
while(int_stat[0]==0)
handle_scsi_int();
if(int_stat[0]==SIR_COMPLETE) {
if(pccb->msgin[0]==M_DISCONNECT) {
PRINTF("Wait for reselection\n");
for(i=0;i<3;i++)
int_stat[i]=0; /* delete all int status */
scsi_write_dsp(phys_to_bus(&script_reselection[0])); /* start reselection script */
goto retry;
}
pccb->contr_stat=SIR_COMPLETE;
return;
}
if((int_stat[0] & SCSI_INT_STATE)==SCSI_INT_STATE) { /* scsi interrupt */
sstat=(unsigned short)int_stat[0];
if((sstat & STO)==STO) { /* selection timeout */
pccb->contr_stat=SCSI_SEL_TIME_OUT;
scsi_write_byte(GPREG,0x01);
PRINTF("ID: %X Selection Timeout\n",pccb->target);
return;
}
if((sstat & UDC)==UDC) { /* unexpected disconnect */
pccb->contr_stat=SCSI_UNEXP_DIS;
scsi_write_byte(GPREG,0x01);
PRINTF("ID: %X Unexpected Disconnect\n",pccb->target);
return;
}
if((sstat & RSL)==RSL) { /* reselection */
pccb->contr_stat=SCSI_UNEXP_DIS;
scsi_write_byte(GPREG,0x01);
PRINTF("ID: %X Unexpected Disconnect\n",pccb->target);
return;
}
if(((sstat & MA)==MA)||((sstat & HTH)==HTH)) { /* phase missmatch */
if(retrycnt<SCSI_MAX_RETRY) {
pccb->trans_bytes=pccb->datalen -
((unsigned long)scsi_read_byte(DBC) |
((unsigned long)scsi_read_byte(DBC+1)<<8) |
((unsigned long)scsi_read_byte(DBC+2)<<16));
for(i=0;i<3;i++)
int_stat[i]=0; /* delete all int status */
retrycnt++;
PRINTF("ID: %X Phase Missmatch Retry %d Phase %02X transfered %lx\n",
pccb->target,retrycnt,scsi_read_byte(SBCL),pccb->trans_bytes);
scsi_write_dsp(phys_to_bus(&script_cmd[4])); /* start retry script */
goto retry;
}
if((sstat & MA)==MA)
pccb->contr_stat=SCSI_MA_TIME_OUT;
else
pccb->contr_stat=SCSI_HNS_TIME_OUT;
PRINTF("Phase Missmatch stat %lx\n",pccb->contr_stat);
return;
} /* no phase int */
/* if((sstat & CMP)==CMP) {
pccb->contr_stat=SIR_COMPLETE;
return;
}
*/
PRINTF("SCSI INT %lX\n",int_stat[0]);
pccb->contr_stat=int_stat[0];
return;
} /* end scsi int */
PRINTF("SCRIPT INT %lX phase %02X\n",int_stat[0],scsi_read_byte(SBCL));
pccb->contr_stat=int_stat[0];
return;
}
int scsi_exec(ccb *pccb)
{
unsigned char tmpcmd[16],tmpstat;
int i,retrycnt,t;
unsigned long transbytes,datalen;
unsigned char *tmpptr;
retrycnt=0;
retry:
scsi_issue(pccb);
if(pccb->contr_stat!=SIR_COMPLETE)
return FALSE;
if(pccb->status==S_GOOD)
return TRUE;
if(pccb->status==S_CHECK_COND) { /* check condition */
for(i=0;i<16;i++)
tmpcmd[i]=pccb->cmd[i];
pccb->cmd[0]=SCSI_REQ_SENSE;
pccb->cmd[1]=pccb->lun<<5;
pccb->cmd[2]=0;
pccb->cmd[3]=0;
pccb->cmd[4]=14;
pccb->cmd[5]=0;
pccb->cmdlen=6;
pccb->msgout[0]=SCSI_IDENTIFY;
transbytes=pccb->trans_bytes;
tmpptr=pccb->pdata;
pccb->pdata=&pccb->sense_buf[0];
datalen=pccb->datalen;
pccb->datalen=14;
tmpstat=pccb->status;
scsi_issue(pccb);
for(i=0;i<16;i++)
pccb->cmd[i]=tmpcmd[i];
pccb->trans_bytes=transbytes;
pccb->pdata=tmpptr;
pccb->datalen=datalen;
pccb->status=tmpstat;
PRINTF("Request_sense sense key %x ASC %x ASCQ %x\n",pccb->sense_buf[2]&0x0f,
pccb->sense_buf[12],pccb->sense_buf[13]);
switch(pccb->sense_buf[2]&0xf) {
case SENSE_NO_SENSE:
case SENSE_RECOVERED_ERROR:
/* seems to be ok */
return TRUE;
break;
case SENSE_NOT_READY:
if((pccb->sense_buf[12]!=0x04)||(pccb->sense_buf[13]!=0x01)) {
/* if device is not in process of becoming ready */
return FALSE;
break;
} /* else fall through */
case SENSE_UNIT_ATTENTION:
if(retrycnt<SCSI_MAX_RETRY_NOT_READY) {
PRINTF("Target %d not ready, retry %d\n",pccb->target,retrycnt);
for(t=0;t<SCSI_NOT_READY_TIME_OUT;t++)
udelay(1000); /* 1sec wait */
retrycnt++;
goto retry;
}
PRINTF("Target %d not ready, %d retried\n",pccb->target,retrycnt);
return FALSE;
default:
return FALSE;
}
}
PRINTF("Status = %X\n",pccb->status);
return FALSE;
}
void scsi_chip_init(void)
{
/* first we issue a soft reset */
scsi_write_byte(ISTAT,SRST);
udelay(1000);
scsi_write_byte(ISTAT,0);
/* setup chip */
scsi_write_byte(SCNTL0,0xC0); /* full arbitration no start, no message, parity disabled, master */
scsi_write_byte(SCNTL1,0x00);
scsi_write_byte(SCNTL2,0x00);
#ifndef CFG_SCSI_SYM53C8XX_CCF /* config value for none 40 mhz clocks */
scsi_write_byte(SCNTL3,0x13); /* synchronous clock 40/4=10MHz, asynchronous 40MHz */
#else
scsi_write_byte(SCNTL3,CFG_SCSI_SYM53C8XX_CCF); /* config value for none 40 mhz clocks */
#endif
scsi_write_byte(SCID,0x47); /* ID=7, enable reselection */
scsi_write_byte(SXFER,0x00); /* synchronous transfer period 10MHz, asynchronous */
scsi_write_byte(SDID,0x00); /* targed SCSI ID = 0 */
scsi_int_mask=0x0000; /* no Interrupt is enabled */
script_int_mask=0x00;
scsi_int_enable();
scsi_write_byte(GPREG,0x01); /* GPIO0 is LED (off) */
scsi_write_byte(GPCNTL,0x0E); /* GPIO0 is Output */
scsi_write_byte(STIME0,0x08); /* handshake timer disabled, selection timeout 512msec */
scsi_write_byte(RESPID,0x80); /* repond only to the own ID (reselection) */
scsi_write_byte(STEST1,0x00); /* not isolated, SCLK is used */
scsi_write_byte(STEST2,0x00); /* no Lowlevel Mode? */
scsi_write_byte(STEST3,0x80); /* enable tolerANT */
scsi_write_byte(CTEST3,0x04); /* clear FIFO */
scsi_write_byte(CTEST4,0x00);
scsi_write_byte(CTEST5,0x00);
#ifdef SCSI_SINGLE_STEP
/* scsi_write_byte(DCNTL,IRQM | SSM); */
scsi_write_byte(DCNTL,IRQD | SSM);
scsi_write_byte(DMODE,MAN);
#else
/* scsi_write_byte(DCNTL,IRQM); */
scsi_write_byte(DCNTL,IRQD);
scsi_write_byte(DMODE,0x00);
#endif
}
#endif
#endif /* CONFIG_SCSI_SYM53C8XX */
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