home *** CD-ROM | disk | FTP | other *** search
- /* $Id$
- * 1993/03/31
- * linux/kernel/aha1740.c
- *
- * Based loosely on aha1542.c which is
- * Copyright (C) 1992 Tommy Thorn and
- * Modified by Eric Youngdale
- *
- * This file is aha1740.c, written and
- * Copyright (C) 1992,1993 Brad McLean
- *
- * Modifications to makecode and queuecommand
- * for proper handling of multiple devices courteously
- * provided by Michael Weller, March, 1993
- *
- * aha1740_makecode may still need even more work
- * if it doesn't work for your devices, take a look.
- */
-
- #include <linux/kernel.h>
- #include <linux/head.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/ioport.h>
-
- #include <linux/sched.h>
- #include <asm/dma.h>
-
- #include <asm/system.h>
- #include <asm/io.h>
- #include "../block/blk.h"
- #include "scsi.h"
- #include "hosts.h"
- #include "sd.h"
-
- #include "aha1740.h"
-
- /* IF YOU ARE HAVING PROBLEMS WITH THIS DRIVER, AND WANT TO WATCH
- IT WORK, THEN:
- #define DEBUG
- */
- #ifdef DEBUG
- #define DEB(x) x
- #else
- #define DEB(x)
- #endif
-
- /*
- static const char RCSid[] = "$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/aha1740.c,v 1.1 1992/07/24 06:27:38 root Exp root $";
- */
-
- static unsigned int slot, base;
- static unsigned char irq_level;
-
- static struct ecb ecb[AHA1740_ECBS]; /* One for each queued operation */
-
- static int aha1740_last_ecb_used = 0; /* optimization */
-
- int aha1740_makecode(unchar *sense, unchar *status)
- {
- struct statusword
- {
- ushort don:1, /* Command Done - No Error */
- du:1, /* Data underrun */
- :1, qf:1, /* Queue full */
- sc:1, /* Specification Check */
- dor:1, /* Data overrun */
- ch:1, /* Chaining Halted */
- intr:1, /* Interrupt issued */
- asa:1, /* Additional Status Available */
- sns:1, /* Sense information Stored */
- :1, ini:1, /* Initialization Required */
- me:1, /* Major error or exception */
- :1, eca:1, /* Extended Contingent alliance */
- :1;
- } status_word;
- int retval = DID_OK;
-
- status_word = * (struct statusword *) status;
- #ifdef DEBUG
- printk("makecode from %x,%x,%x,%x %x,%x,%x,%x",status[0],status[1],status[2],status[3],
- sense[0],sense[1],sense[2],sense[3]);
- #endif
- if (!status_word.don) /* Anything abnormal was detected */
- {
- if ( (status[1]&0x18) || status_word.sc ) /*Additional info available*/
- {
- /* Use the supplied info for further diagnostics */
- switch ( status[2] )
- {
- case 0x12:
- if ( status_word.dor )
- retval=DID_ERROR; /* It's an Overrun */
- /* If not overrun, assume underrun and ignore it! */
- case 0x00: /* No info, assume no error, should not occur */
- break;
- case 0x11:
- case 0x21:
- retval=DID_TIME_OUT;
- break;
- case 0x0a:
- retval=DID_BAD_TARGET;
- break;
- case 0x04:
- case 0x05:
- retval=DID_ABORT; /* Either by this driver or the AHA1740
- itself */
- break;
- default:
- retval=DID_ERROR; /* No further diagnostics possible */
- }
- }
- else
- { /* Michael suggests, and Brad concurs: */
- if ( status_word.qf )
- {
- retval = DID_TIME_OUT; /* forces a redo */
- /* I think this specific one should not happen -Brad */
- printk("aha1740.c: WARNING: AHA1740 queue overflow!\n");
- }
- else if ( status[0]&0x60 )
- {
- retval = DID_ERROR; /* Didn't found a better error */
- }
- /* In any other case return DID_OK so for example
- CONDITION_CHECKS make it through to the appropriate
- device driver */
- }
- }
- /* Under all circumstances supply the target status -Michael */
- return status[3] | retval << 16;
- }
-
- int aha1740_test_port(void)
- {
- char name[4],tmp;
-
- /* Okay, look for the EISA ID's */
- name[0]= 'A' -1 + ((tmp = inb(HID0)) >> 2); /* First character */
- name[1]= 'A' -1 + ((tmp & 3) << 3);
- name[1]+= ((tmp = inb(HID1)) >> 5)&0x7; /* Second Character */
- name[2]= 'A' -1 + (tmp & 0x1f); /* Third Character */
- name[3]=0;
- tmp = inb(HID2);
- if ( strcmp ( name, HID_MFG ) || inb(HID2) != HID_PRD )
- return 0; /* Not an Adaptec 174x */
-
- /* if ( inb(HID3) != HID_REV )
- printk("aha1740: Warning; board revision of %d; expected %d\n",
- inb(HID3),HID_REV); */
-
- if ( inb(EBCNTRL) != EBCNTRL_VALUE )
- {
- printk("aha1740: Board detected, but EBCNTRL = %x, so disabled it.\n",
- inb(EBCNTRL));
- return 0;
- }
-
- if ( inb(PORTADR) & PORTADDR_ENH )
- return 1; /* Okay, we're all set */
-
- printk("aha1740: Board detected, but not in enhanced mode, so disabled it.\n");
- return 0;
- }
-
- /* A "high" level interrupt handler */
- void aha1740_intr_handle(int irq, struct pt_regs * regs)
- {
- void (*my_done)(Scsi_Cmnd *);
- int errstatus, adapstat;
- int number_serviced;
- struct ecb *ecbptr;
- Scsi_Cmnd *SCtmp;
-
- number_serviced = 0;
-
- while(inb(G2STAT) & G2STAT_INTPEND)
- {
- DEB(printk("aha1740_intr top of loop.\n"));
- adapstat = inb(G2INTST);
- outb(G2CNTRL_IRST,G2CNTRL); /* interrupt reset */
-
- switch ( adapstat & G2INTST_MASK )
- {
- case G2INTST_CCBRETRY:
- case G2INTST_CCBERROR:
- case G2INTST_CCBGOOD:
- ecbptr = (struct ecb *) ( ((ulong) inb(MBOXIN0)) +
- ((ulong) inb(MBOXIN1) <<8) +
- ((ulong) inb(MBOXIN2) <<16) +
- ((ulong) inb(MBOXIN3) <<24) );
- outb(G2CNTRL_HRDY,G2CNTRL); /* Host Ready -> Mailbox in complete */
- if (!ecbptr)
- {
- printk("Aha1740 null ecbptr in interrupt (%x,%x,%x,%d)\n",
- inb(G2STAT),adapstat,inb(G2INTST),number_serviced++);
- continue;
- }
- SCtmp = ecbptr->SCpnt;
- if (!SCtmp)
- {
- printk("Aha1740 null SCtmp in interrupt (%x,%x,%x,%d)\n",
- inb(G2STAT),adapstat,inb(G2INTST),number_serviced++);
- continue;
- }
- if (SCtmp->host_scribble)
- scsi_free(SCtmp->host_scribble, 512);
- /* Fetch the sense data, and tuck it away, in the required slot. The
- Adaptec automatically fetches it, and there is no guarantee that
- we will still have it in the cdb when we come back */
- if ( (adapstat & G2INTST_MASK) == G2INTST_CCBERROR )
- {
- memcpy(SCtmp->sense_buffer, ecbptr->sense,
- sizeof(SCtmp->sense_buffer));
- errstatus = aha1740_makecode(ecbptr->sense,ecbptr->status);
- }
- else
- errstatus = 0;
- DEB(if (errstatus) printk("aha1740_intr_handle: returning %6x\n", errstatus));
- SCtmp->result = errstatus;
- my_done = ecbptr->done;
- memset(ecbptr,0,sizeof(struct ecb));
- if ( my_done )
- my_done(SCtmp);
- break;
- case G2INTST_HARDFAIL:
- printk("aha1740 hardware failure!\n");
- panic("aha1740.c"); /* Goodbye */
- case G2INTST_ASNEVENT:
- printk("aha1740 asynchronous event: %02x %02x %02x %02x %02x\n",adapstat,
- inb(MBOXIN0),inb(MBOXIN1),inb(MBOXIN2),inb(MBOXIN3)); /* Say What? */
- outb(G2CNTRL_HRDY,G2CNTRL); /* Host Ready -> Mailbox in complete */
- break;
- case G2INTST_CMDGOOD:
- /* set immediate command success flag here: */
- break;
- case G2INTST_CMDERROR:
- /* Set immediate command failure flag here: */
- break;
- }
- number_serviced++;
- };
- }
-
- int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
- {
- unchar direction;
- unchar *cmd = (unchar *) SCpnt->cmnd;
- unchar target = SCpnt->target;
- unsigned long flags;
- void *buff = SCpnt->request_buffer;
- int bufflen = SCpnt->request_bufflen;
- int ecbno;
- DEB(int i);
-
-
- if(*cmd == REQUEST_SENSE)
- {
- if (bufflen != sizeof(SCpnt->sense_buffer))
- {
- printk("Wrong buffer length supplied for request sense (%d)\n",bufflen);
- }
- SCpnt->result = 0;
- done(SCpnt);
- return 0;
- }
-
- #ifdef DEBUG
- if (*cmd == READ_10 || *cmd == WRITE_10)
- i = xscsi2int(cmd+2);
- else if (*cmd == READ_6 || *cmd == WRITE_6)
- i = scsi2int(cmd+2);
- else
- i = -1;
- printk("aha1740_queuecommand: dev %d cmd %02x pos %d len %d ", target, *cmd, i, bufflen);
- printk("scsi cmd:");
- for (i = 0; i < SCpnt->cmd_len; i++) printk("%02x ", cmd[i]);
- printk("\n");
- #endif
-
- /* locate an available ecb */
-
- save_flags(flags);
- cli();
- ecbno = aha1740_last_ecb_used + 1; /* An optimization */
- if (ecbno >= AHA1740_ECBS) ecbno = 0;
-
- do{
- if( ! ecb[ecbno].cmdw )
- break;
- ecbno++;
- if (ecbno >= AHA1740_ECBS ) ecbno = 0;
- } while (ecbno != aha1740_last_ecb_used);
-
- if( ecb[ecbno].cmdw )
- panic("Unable to find empty ecb for aha1740.\n");
-
- ecb[ecbno].cmdw = AHA1740CMD_INIT; /* SCSI Initiator Command doubles as reserved flag */
-
- aha1740_last_ecb_used = ecbno;
- restore_flags(flags);
-
- #ifdef DEBUG
- printk("Sending command (%d %x)...",ecbno, done);
- #endif
-
- ecb[ecbno].cdblen = SCpnt->cmd_len; /* SCSI Command Descriptor Block Length */
-
- direction = 0;
- if (*cmd == READ_10 || *cmd == READ_6)
- direction = 1;
- else if (*cmd == WRITE_10 || *cmd == WRITE_6)
- direction = 0;
-
- memcpy(ecb[ecbno].cdb, cmd, ecb[ecbno].cdblen);
-
- if (SCpnt->use_sg)
- {
- struct scatterlist * sgpnt;
- struct aha1740_chain * cptr;
- int i;
- #ifdef DEBUG
- unsigned char * ptr;
- #endif
- ecb[ecbno].sg = 1; /* SCSI Initiator Command w/scatter-gather*/
- SCpnt->host_scribble = (unsigned char *) scsi_malloc(512);
- sgpnt = (struct scatterlist *) SCpnt->request_buffer;
- cptr = (struct aha1740_chain *) SCpnt->host_scribble;
- if (cptr == NULL) panic("aha1740.c: unable to allocate DMA memory\n");
- for(i=0; i<SCpnt->use_sg; i++)
- {
- cptr[i].dataptr = (long) sgpnt[i].address;
- cptr[i].datalen = sgpnt[i].length;
- }
- ecb[ecbno].datalen = SCpnt->use_sg * sizeof(struct aha1740_chain);
- ecb[ecbno].dataptr = (long) cptr;
- #ifdef DEBUG
- printk("cptr %x: ",cptr);
- ptr = (unsigned char *) cptr;
- for(i=0;i<24;i++) printk("%02x ", ptr[i]);
- #endif
- }
- else
- {
- SCpnt->host_scribble = NULL;
- ecb[ecbno].datalen = bufflen;
- ecb[ecbno].dataptr = (long) buff;
- }
- ecb[ecbno].lun = SCpnt->lun;
- ecb[ecbno].ses = 1; /* Suppress underrun errors */
- ecb[ecbno].dir= direction;
- ecb[ecbno].ars=1; /* Yes, get the sense on an error */
- ecb[ecbno].senselen = 12;
- ecb[ecbno].senseptr = (long) ecb[ecbno].sense;
- ecb[ecbno].statusptr = (long) ecb[ecbno].status;
- ecb[ecbno].done = done;
- ecb[ecbno].SCpnt = SCpnt;
- #ifdef DEBUG
- {
- int i;
- printk("aha1740_command: sending.. ");
- for (i = 0; i < sizeof(ecb[ecbno])-10; i++)
- printk("%02x ", ((unchar *)&ecb[ecbno])[i]);
- }
- printk("\n");
- #endif
- if (done)
- { /* You may question the code below, which contains potentially
- non-terminating while loops with interrupts disabled. So did
- I when I wrote it, but the Adaptec Spec says the card is so fast,
- that this problem virtually never occurs so I've kept it. We
- do printk a warning first, so that you'll know if it happens.
- In practice the only time we've seen this message is when some-
- thing else is in the driver was broken, like _makecode(), or
- when a scsi device hung the scsi bus. Even under these conditions,
- The loop actually only cycled < 3 times (we instrumented it). */
- ulong adrs;
-
- DEB(printk("aha1740[%d] critical section\n",ecbno));
- save_flags(flags);
- cli();
- if ( ! (inb(G2STAT) & G2STAT_MBXOUT) )
- {
- printk("aha1740[%d]_mbxout wait!\n",ecbno);
- cli(); /* printk may have done a sti()! */
- }
- while ( ! (inb(G2STAT) & G2STAT_MBXOUT) ); /* Oh Well. */
- adrs = (ulong) &(ecb[ecbno]); /* Spit the command */
- outb((char) (adrs&0xff), MBOXOUT0); /* out, note this set */
- outb((char) ((adrs>>8)&0xff), MBOXOUT1); /* of outb's must be */
- outb((char) ((adrs>>16)&0xff), MBOXOUT2); /* atomic */
- outb((char) ((adrs>>24)&0xff), MBOXOUT3);
- if ( inb(G2STAT) & G2STAT_BUSY )
- {
- printk("aha1740[%d]_attn wait!\n",ecbno);
- cli();
- }
- while ( inb(G2STAT) & G2STAT_BUSY ); /* And Again! */
- outb(ATTN_START | (target & 7), ATTN); /* Start it up */
- restore_flags(flags);
- DEB(printk("aha1740[%d] request queued.\n",ecbno));
- }
- else
- printk("aha1740_queuecommand: done can't be NULL\n");
-
- return 0;
- }
-
- static volatile int internal_done_flag = 0;
- static volatile int internal_done_errcode = 0;
-
- static void internal_done(Scsi_Cmnd * SCpnt)
- {
- internal_done_errcode = SCpnt->result;
- ++internal_done_flag;
- }
-
- int aha1740_command(Scsi_Cmnd * SCpnt)
- {
- aha1740_queuecommand(SCpnt, internal_done);
-
- while (!internal_done_flag);
- internal_done_flag = 0;
- return internal_done_errcode;
- }
-
- /* Query the board for its irq_level. Nothing else matters
- in enhanced mode on an EISA bus. */
-
- void aha1740_getconfig(void)
- {
- static int intab[] = { 9,10,11,12,0,14,15,0 };
-
- irq_level = intab [ inb(INTDEF)&0x7 ];
- }
-
- int aha1740_detect(Scsi_Host_Template * tpnt)
- {
- memset(&ecb, 0, sizeof(struct ecb));
- DEB(printk("aha1740_detect: \n"));
-
- for ( slot=MINEISA; slot <= MAXEISA; slot++ )
- {
- base = SLOTBASE(slot);
-
- /* The ioports for eisa boards are generally beyond that used in the
- check,snarf_region code, but this may change at some point, so we
- go through the motions. */
-
- if(check_region(base, 0x5c)) continue; /* See if in use */
- if ( aha1740_test_port()) break;
- }
- if ( slot > MAXEISA )
- return 0;
-
- aha1740_getconfig();
-
- if ( (inb(G2STAT) & (G2STAT_MBXOUT | G2STAT_BUSY) ) != G2STAT_MBXOUT )
- { /* If the card isn't ready, hard reset it */
- outb(G2CNTRL_HRST,G2CNTRL);
- outb(0,G2CNTRL);
- }
-
- printk("Configuring Adaptec at IO:%x, IRQ %d\n",base,
- irq_level);
-
- DEB(printk("aha1740_detect: enable interrupt channel %d\n", irq_level));
-
- if (request_irq(irq_level,aha1740_intr_handle, 0, "aha1740"))
- {
- printk("Unable to allocate IRQ for adaptec controller.\n");
- return 0;
- }
- request_region(base, 0x5c,"aha1740"); /* Reserve the space that we need to use */
- return 1;
- }
-
- /* Note: They following two functions do not apply very well to the Adaptec,
- which basically manages its own affairs quite well without our interference,
- so I haven't put anything into them. I can faintly imagine someone with a
- *very* badly behaved SCSI target (perhaps an old tape?) wanting the abort(),
- but it hasn't happened yet, and doing aborts brings the Adaptec to its
- knees. I cannot (at this moment in time) think of any reason to reset the
- card once it's running. So there. */
-
- int aha1740_abort(Scsi_Cmnd * SCpnt)
- {
- DEB(printk("aha1740_abort called\n"));
- return SCSI_ABORT_SNOOZE;
- }
-
- /* We do not implement a reset function here, but the upper level code assumes
- that it will get some kind of response for the command in SCpnt. We must
- oblige, or the command will hang the scsi system */
-
- int aha1740_reset(Scsi_Cmnd * SCpnt)
- {
- DEB(printk("aha1740_reset called\n"));
- return SCSI_RESET_PUNT;
- }
-
- int aha1740_biosparam(Disk * disk, int dev, int* ip)
- {
- int size = disk->capacity;
- DEB(printk("aha1740_biosparam\n"));
- ip[0] = 64;
- ip[1] = 32;
- ip[2] = size >> 11;
- /* if (ip[2] >= 1024) ip[2] = 1024; */
- return 0;
- }
-
- /* Okay, you made it all the way through. As of this writing, 3/31/93, I'm
- brad@saturn.gaylord.com or brad@bradpc.gaylord.com. I'll try to help as time
- permits if you have any trouble with this driver. Happy Linuxing! */
-