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date and time created 92/03/09 14:24:21 by bostic
[unix-history] / usr / src / sys / pmax / dev / asc.c
/*-
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* %sccs.include.redist.c%
*
* @(#)asc.c 7.1 (Berkeley) %G%
*/
/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* HISTORY
* $Log: scsi_53C94_hdw.c,v $
* Revision 2.5 91/02/05 17:45:07 mrt
* Added author notices
* [91/02/04 11:18:43 mrt]
*
* Changed to use new Mach copyright
* [91/02/02 12:17:20 mrt]
*
* Revision 2.4 91/01/08 15:48:24 rpd
* Added continuation argument to thread_block.
* [90/12/27 rpd]
*
* Revision 2.3 90/12/05 23:34:48 af
* Recovered from pmax merge.. and from the destruction of a disk.
* [90/12/03 23:40:40 af]
*
* Revision 2.1.1.1 90/11/01 03:39:09 af
* Created, from the DEC specs:
* "PMAZ-AA TURBOchannel SCSI Module Functional Specification"
* Workstation Systems Engineering, Palo Alto, CA. Aug 27, 1990.
* And from the NCR data sheets
* "NCR 53C94, 53C95, 53C96 Advances SCSI Controller"
* [90/09/03 af]
*/
/*
* File: scsi_53C94_hdw.h
* Author: Alessandro Forin, Carnegie Mellon University
* Date: 9/90
*
* Bottom layer of the SCSI driver: chip-dependent functions
*
* This file contains the code that is specific to the NCR 53C94
* SCSI chip (Host Bus Adapter in SCSI parlance): probing, start
* operation, and interrupt routine.
*/
/*
* This layer works based on small simple 'scripts' that are installed
* at the start of the command and drive the chip to completion.
* The idea comes from the specs of the NCR 53C700 'script' processor.
*
* There are various reasons for this, mainly
* - Performance: identify the common (successful) path, and follow it;
* at interrupt time no code is needed to find the current status
* - Code size: it should be easy to compact common operations
* - Adaptability: the code skeleton should adapt to different chips without
* terrible complications.
* - Error handling: and it is easy to modify the actions performed
* by the scripts to cope with strange but well identified sequences
*
*/
#include "asc.h"
#if NASC > 0
#include "param.h"
#include "systm.h"
#include "dkstat.h"
#include "buf.h"
#include "conf.h"
#include "errno.h"
#include "device.h"
#include "scsi.h"
#include "ascreg.h"
#define ASC_OFFSET_53C94 0x0 /* from module base */
#define ASC_OFFSET_DMAR 0x40000 /* DMA Address Register */
#define ASC_OFFSET_RAM 0x80000 /* SRAM Buffer */
#define ASC_OFFSET_ROM 0xc0000 /* Diagnostic ROM */
#define ASC_RAM_SIZE 0x20000 /* 128k (32k*32) */
/*
* DMA Address Register
*/
#define ASC_DMAR_MASK 0x1ffff /* 17 bits, 128k */
#define ASC_DMAR_WRITE 0x80000000 /* DMA direction bit */
#define ASC_DMA_ADDR(x) ((unsigned)(x)) & ASC_DMAR_MASK
/*
* Synch xfer parameters, and timing conversions
*/
#define SCSI_MIN_PERIOD 50 /* in 4 nsecs units */
#define ASC_MIN_PERIOD 5 /* in CLKS/BYTE, 1 CLK = 40nsecs */
#define ASC_MAX_PERIOD 35 /* in CLKS/BYTE, 1 CLK = 40nsecs */
#define ASC_MAX_OFFSET 15 /* pure number */
int asc_to_scsi_period[] = {
320,
330,
340,
350,
50,
50,
60,
70,
80,
90,
100,
110,
120,
130,
140,
150,
160,
170,
180,
190,
200,
210,
220,
230,
240,
250,
260,
270,
280,
290,
300,
310,
};
/*
* Internal forward declarations.
*/
static void asc_reset();
static void asc_startcmd();
#ifdef DEBUG
int asc_debug = 1;
int asc_debug_cmd;
int asc_debug_bn;
int asc_debug_sz;
#define NLOG 16
struct asc_log {
u_int status;
u_char state;
u_char msg;
int target;
} asc_log[NLOG], *asc_logp = asc_log;
#define PACK(unit, status, ss, ir) \
((unit << 24) | (status << 16) | (ss << 8) | ir)
#endif
/*
* Scripts are entries in a state machine table.
* A script has four parts: a pre-condition, an action, a command to the chip,
* and an index into asc_scripts for the next state. The first triggers error
* handling if not satisfied and in our case it is formed by the
* values of the interrupt register and status register, this
* basically captures the phase of the bus and the TC and BS
* bits. The action part is just a function pointer, and the
* command is what the 53C94 should be told to do at the end
* of the action processing. This command is only issued and the
* script proceeds if the action routine returns TRUE.
* See asc_intr() for how and where this is all done.
*/
typedef struct script {
int condition; /* expected state at interrupt time */
int (*action)(); /* extra operations */
int command; /* command to the chip */
struct script *next; /* index into asc_scripts for next state */
} script_t;
/* Matching on the condition value */
#define SCRIPT_MATCH(ir, csr) ((ir) | (ASC_PHASE(csr) << 8))
/* forward decls of script actions */
int script_nop(); /* when nothing needed */
int asc_end(); /* all come to an end */
int asc_get_status(); /* get status from target */
int asc_dma_in(); /* start reading data from target */
int asc_last_dma_in(); /* cleanup after all data is read */
int asc_resume_dma_in(); /* resume DMA after a disconnect */
int asc_dma_out(); /* send data to target via dma */
int asc_last_dma_out(); /* cleanup after all data is written */
int asc_resume_dma_out(); /* resume DMA after a disconnect */
int asc_sendsync(); /* negotiate sync xfer */
int asc_replysync(); /* negotiate sync xfer */
int asc_recvmsg(); /* process a message byte */
/* Define the index into asc_scripts for various state transitions */
#define SCRIPT_DATA_IN 0
#define SCRIPT_DATA_OUT 2
#define SCRIPT_SIMPLE 4
#define SCRIPT_GET_STATUS 5
#define SCRIPT_MSG_IN 7
#define SCRIPT_REPLY_SYNC 9
#define SCRIPT_RESUME_IN 10
#define SCRIPT_RESUME_OUT 11
#define SCRIPT_TRY_SYNC 12
#define SCRIPT_RESEL 15
#define SCRIPT_RESUME_DMA_IN 16
#define SCRIPT_RESUME_DMA_OUT 17
/*
* Scripts
*/
script_t asc_scripts[] = {
/* data in */
{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_DATAI), /* 0 */
asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
&asc_scripts[SCRIPT_DATA_IN + 1] },
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 1 */
asc_last_dma_in, ASC_CMD_I_COMPLETE,
&asc_scripts[SCRIPT_GET_STATUS] },
/* data out */
{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_DATAO), /* 2 */
asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
&asc_scripts[SCRIPT_DATA_OUT + 1] },
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 3 */
asc_last_dma_out, ASC_CMD_I_COMPLETE,
&asc_scripts[SCRIPT_GET_STATUS] },
/* simple command with no data transfer */
{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_STATUS), /* 4 */
script_nop, ASC_CMD_I_COMPLETE,
&asc_scripts[SCRIPT_GET_STATUS] },
/* get status and finish command */
{SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 5 */
asc_get_status, ASC_CMD_MSG_ACPT,
&asc_scripts[SCRIPT_GET_STATUS + 1] },
{SCRIPT_MATCH(ASC_INT_DISC, 0), /* 6 */
asc_end, ASC_CMD_NOP,
&asc_scripts[SCRIPT_GET_STATUS + 1] },
/* message in */
{SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 7 */
asc_recvmsg, ASC_CMD_MSG_ACPT,
&asc_scripts[SCRIPT_MSG_IN + 1] },
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_IN), /* 8 */
script_nop, ASC_CMD_XFER_INFO,
&asc_scripts[SCRIPT_MSG_IN] },
/* send synchonous negotiation reply */
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_OUT), /* 9 */
asc_replysync, ASC_CMD_XFER_INFO,
&asc_scripts[SCRIPT_REPLY_SYNC] },
/* resume data in after a message */
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAI), /* 10 */
asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
&asc_scripts[SCRIPT_DATA_IN + 1] },
/* resume data out after a message */
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAO), /* 11 */
asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
&asc_scripts[SCRIPT_DATA_OUT + 1] },
/* try to negotiate synchonous transfer parameters */
{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_MSG_OUT), /* 12 */
asc_sendsync, ASC_CMD_XFER_INFO,
&asc_scripts[SCRIPT_GET_STATUS] },
{SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 13 */
script_nop, ASC_CMD_XFER_INFO,
&asc_scripts[SCRIPT_GET_STATUS] },
{SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 14 */
asc_recvmsg, ASC_CMD_MSG_ACPT,
&asc_scripts[SCRIPT_GET_STATUS] },
/* reselect sequence: this is just a placeholder so match fails */
{SCRIPT_MATCH(0, ASC_PHASE_MSG_IN), /* 15 */
script_nop, ASC_CMD_MSG_ACPT,
&asc_scripts[SCRIPT_RESEL] },
/* resume data in after a disconnect */
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAI), /* 16 */
asc_resume_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
&asc_scripts[SCRIPT_DATA_IN + 1] },
/* resume data out after a disconnect */
{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAO), /* 17 */
asc_resume_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
&asc_scripts[SCRIPT_DATA_OUT + 1] },
};
/*
* State kept for each active SCSI device.
*/
typedef struct scsi_state {
script_t *script; /* saved script while processing error */
int statusByte; /* status byte returned during STATUS_PHASE */
int error; /* errno to pass back to device driver */
u_char *dmaBufAddr; /* DMA buffer address */
u_int dmaBufSize; /* DMA buffer size */
int dmalen; /* amount to transfer in this chunk */
int dmaresid; /* amount not transfered if chunk suspended */
int buflen; /* total remaining amount of data to transfer */
char *buf; /* current pointer within scsicmd->buf */
int flags; /* see below */
int msglen; /* number of message bytes to read */
int msgcnt; /* number of message bytes received */
u_char sync_period; /* DMA synchronous period */
u_char sync_offset; /* DMA synchronous xfer offset or 0 if async */
u_char msg_out; /* next MSG_OUT byte to send */
u_char msg_in[16]; /* buffer for multibyte messages */
} State;
/* state flags */
#define DISCONN 0x01 /* true if currently disconnected from bus */
#define FIRST_DMA 0x02 /* true if no data DMA started yet */
#define DMA_IN 0x04 /* true if reading from SCSI device */
#define DMA_OUT 0x10 /* true if writing to SCSI device */
#define DID_SYNC 0x20 /* true if synchronous offset was negotiated */
#define TRY_SYNC 0x40 /* true if try neg. synchronous offset */
#define ASC_NCMD 7
/*
* State kept for each active SCSI host interface (53C94).
*/
struct asc_softc {
asc_regmap_t *regs; /* chip address */
volatile int *dmar; /* DMA address register address */
volatile u_char *buff; /* RAM buffer address */
int myid; /* SCSI ID of this interface */
int myidmask; /* ~(1 << myid) */
int state; /* current SCSI connection state */
int target; /* target SCSI ID if busy */
script_t *script; /* next expected interrupt & action */
ScsiCmd *cmd[ASC_NCMD]; /* active command indexed by SCSI ID */
State st[ASC_NCMD]; /* state info for each active command */
} asc_softc[NASC];
#define ASC_STATE_IDLE 0 /* idle state */
#define ASC_STATE_BUSY 1 /* selecting or currently connected */
#define ASC_STATE_TARGET 2 /* currently selected as target */
#define ASC_STATE_RESEL 3 /* currently waiting for reselect */
typedef struct asc_softc *asc_softc_t;
/*
* Definition of the controller for the auto-configuration program.
*/
int asc_probe();
void asc_start();
void asc_intr();
struct driver ascdriver = {
"asc", asc_probe, asc_start, 0, asc_intr,
};
/*
* Test to see if device is present.
* Return true if found and initialized ok.
*/
asc_probe(cp)
register struct pmax_ctlr *cp;
{
register asc_softc_t asc;
register asc_regmap_t *regs;
int unit, id, s, i;
if ((unit = cp->pmax_unit) >= NASC)
return (0);
if (badaddr(cp->pmax_addr + ASC_OFFSET_53C94, 1))
return (0);
asc = &asc_softc[unit];
/*
* Initialize hw descriptor, cache some pointers
*/
asc->regs = (asc_regmap_t *)(cp->pmax_addr + ASC_OFFSET_53C94);
asc->dmar = (volatile int *)(cp->pmax_addr + ASC_OFFSET_DMAR);
asc->buff = (volatile u_char *)(cp->pmax_addr + ASC_OFFSET_RAM);
asc->state = ASC_STATE_IDLE;
asc->target = -1;
regs = asc->regs;
/*
* Reset chip, fully. Note that interrupts are already enabled.
*/
s = splbio();
/* preserve our ID for now */
asc->myid = regs->asc_cnfg1 & ASC_CNFG1_MY_BUS_ID;
asc->myidmask = ~(1 << asc->myid);
asc_reset(asc, regs);
/*
* Our SCSI id on the bus.
* The user can set this via the prom on 3maxen/pmaxen.
* If this changes it is easy to fix: make a default that
* can be changed as boot arg.
*/
#ifdef unneeded
regs->asc_cnfg1 = (regs->asc_cnfg1 & ~ASC_CNFG1_MY_BUS_ID) |
(scsi_initiator_id[unit] & 0x7);
#endif
id = regs->asc_cnfg1 & ASC_CNFG1_MY_BUS_ID;
splx(s);
/*
* Statically partition the DMA buffer between targets.
* This way we will eventually be able to attach/detach
* drives on-fly. And 18k/target is plenty for normal use.
*/
#define PER_TGT_DMA_SIZE ((ASC_RAM_SIZE/7) & ~(sizeof(int)-1))
/*
* Give each target its own DMA buffer region.
* We may want to try ping ponging buffers later.
*/
for (i = 0; i < ASC_NCMD; i++) {
asc->st[i].dmaBufAddr = asc->buff + PER_TGT_DMA_SIZE * i;
asc->st[i].dmaBufSize = PER_TGT_DMA_SIZE;
}
printf("asc%d at nexus0 csr 0x%x priority %d SCSI id %d\n",
unit, cp->pmax_addr, cp->pmax_pri, id);
return (1);
}
/*
* Start activity on a SCSI device.
* We maintain information on each device separately since devices can
* connect/disconnect during an operation.
*/
void
asc_start(scsicmd)
register ScsiCmd *scsicmd; /* command to start */
{
register struct scsi_device *sdp = scsicmd->sd;
register asc_softc_t asc = &asc_softc[sdp->sd_ctlr];
int s;
s = splbio();
/*
* Check if another command is already in progress.
* We may have to change this if we allow SCSI devices with
* separate LUNs.
*/
if (asc->cmd[sdp->sd_drive]) {
printf("asc%d: device %s busy at start\n", sdp->sd_ctlr,
sdp->sd_driver->d_name);
(*sdp->sd_driver->d_done)(scsicmd->unit, EBUSY,
scsicmd->buflen, 0);
splx(s);
}
asc->cmd[sdp->sd_drive] = scsicmd;
asc_startcmd(asc, sdp->sd_drive);
splx(s);
}
static void
asc_reset(asc, regs)
asc_softc_t asc;
asc_regmap_t *regs;
{
/*
* Reset chip and wait till done
*/
regs->asc_cmd = ASC_CMD_RESET;
MachEmptyWriteBuffer(); DELAY(25);
/* spec says this is needed after reset */
regs->asc_cmd = ASC_CMD_NOP;
MachEmptyWriteBuffer(); DELAY(25);
/*
* Set up various chip parameters
*/
regs->asc_ccf = ASC_CCF_25MHz; /* 25 MHz clock */
MachEmptyWriteBuffer(); DELAY(25);
regs->asc_sel_timo = ASC_TIMEOUT_250;
/* restore our ID */
regs->asc_cnfg1 = asc->myid | ASC_CNFG1_P_CHECK;
regs->asc_cnfg2 = /* ASC_CNFG2_RFB | */ ASC_CNFG2_EPL;
regs->asc_cnfg3 = 0;
/* zero anything else */
ASC_TC_PUT(regs, 0);
regs->asc_sel_timo = ASC_TIMEOUT_250;
regs->asc_syn_p = ASC_MIN_PERIOD;
regs->asc_syn_o = 0; /* async for now */
MachEmptyWriteBuffer();
}
/*
* Start a SCSI command on a target.
*/
static void
asc_startcmd(asc, target)
asc_softc_t asc;
int target;
{
register asc_regmap_t *regs;
register ScsiCmd *scsicmd;
register State *state;
int len;
/*
* See if another target is currently selected on this SCSI bus.
*/
if (asc->target >= 0)
return;
regs = asc->regs;
/*
* Check to see if a reselection is in progress and if so,
* try to cancel it or respond to the reselection if it won.
*/
if (asc->state == ASC_STATE_RESEL) {
regs->asc_cmd = ASC_CMD_DISABLE_SEL;
while (!(regs->asc_status & ASC_CSR_INT))
DELAY(1);
asc_intr(asc - asc_softc);
/* we will be busy if a reselecting device won */
if (asc->state == ASC_STATE_BUSY)
return;
}
asc->state = ASC_STATE_BUSY;
asc->target = target;
/* cache some pointers */
scsicmd = asc->cmd[target];
state = &asc->st[target];
#ifdef DEBUG
if (asc_debug > 1) {
printf("asc_startcmd: %s target %d cmd %x len %d\n",
scsicmd->sd->sd_driver->d_name, target,
scsicmd->cmd[0], scsicmd->buflen);
}
asc_debug_cmd = scsicmd->cmd[0];
if (scsicmd->cmd[0] == SCSI_READ_EXT) {
asc_debug_bn = (scsicmd->cmd[2] << 24) |
(scsicmd->cmd[3] << 16) |
(scsicmd->cmd[4] << 8) |
scsicmd->cmd[5];
asc_debug_sz = (scsicmd->cmd[7] << 8) | scsicmd->cmd[8];
}
asc_logp->status = PACK(asc - asc_softc, 0, 0, 0);
asc_logp->target = asc->target;
asc_logp->state = 0;
if (++asc_logp >= &asc_log[NLOG])
asc_logp = asc_log;
#endif
/*
* Init the chip and target state.
*/
regs->asc_cmd = ASC_CMD_FLUSH;
state->flags = FIRST_DMA | (state->flags & DID_SYNC);
state->error = 0;
state->script = (script_t *)0;
state->msg_out = SCSI_NO_OP;
/*
* Copy command data to the DMA buffer.
*/
len = scsicmd->cmdlen;
state->dmalen = len;
bcopy(scsicmd->cmd, state->dmaBufAddr, len);
/* check for simple SCSI command with no data transfer */
if ((state->buflen = scsicmd->buflen) == 0) {
/* check for sync negotiation */
if ((scsicmd->flags & SCSICMD_USE_SYNC) &&
!(state->flags & DID_SYNC)) {
asc->script = &asc_scripts[SCRIPT_TRY_SYNC];
state->flags |= TRY_SYNC;
} else
asc->script = &asc_scripts[SCRIPT_SIMPLE];
state->buf = (char *)0;
} else if (scsicmd->flags & SCSICMD_DATA_TO_DEVICE) {
int cnt;
asc->script = &asc_scripts[SCRIPT_DATA_OUT];
/* setup to write first chunk */
state->flags |= DMA_OUT;
state->buf = scsicmd->buf;
cnt = state->dmaBufSize - len;
if (cnt > state->buflen)
cnt = state->buflen;
else printf("can't write in one chunk cnt %d buflen %d\n",
cnt, state->buflen); /* XXX */
state->dmalen = cnt;
bcopy(state->buf, state->dmaBufAddr + len, cnt);
} else {
asc->script = &asc_scripts[SCRIPT_DATA_IN];
state->buf = scsicmd->buf;
state->flags |= DMA_IN;
}
/* preload the FIFO with the message to be sent */
regs->asc_fifo = /* SCSI_IDENTIFY */ SCSI_DIS_REC_IDENTIFY;
/* start the asc */
*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr);
ASC_TC_PUT(regs, len);
regs->asc_dbus_id = target;
regs->asc_syn_p = state->sync_period;
regs->asc_syn_o = state->sync_offset;
if (state->flags & TRY_SYNC)
regs->asc_cmd = ASC_CMD_SEL_ATN_STOP | ASC_CMD_DMA;
else
regs->asc_cmd = ASC_CMD_SEL_ATN | ASC_CMD_DMA;
}
/*
* Interrupt routine
* Take interrupts from the chip
*
* Implementation:
* Move along the current command's script if
* all is well, invoke error handler if not.
*/
void
asc_intr(unit)
int unit;
{
register asc_softc_t asc = &asc_softc[unit];
register asc_regmap_t *regs = asc->regs;
register State *state;
register script_t *scpt;
register int ss, ir, status;
again:
/* collect ephemeral information */
status = regs->asc_status;
ss = regs->asc_ss;
ir = regs->asc_intr; /* this resets the previous two */
scpt = asc->script;
#ifdef DEBUG
asc_logp->status = PACK(unit, status, ss, ir);
asc_logp->target = (asc->state == ASC_STATE_BUSY) ? asc->target : -1;
asc_logp->state = scpt - asc_scripts;
asc_logp->msg = -1;
if (++asc_logp >= &asc_log[NLOG])
asc_logp = asc_log;
if (asc_debug > 2)
printf("asc_intr: status %x ss %x ir %x cond %d:%x\n",
status, ss, ir, scpt - asc_scripts, scpt->condition);
#endif
/* check the expected state */
if (SCRIPT_MATCH(ir, status) == scpt->condition) {
/*
* Perform the appropriate operation, then proceed.
*/
if ((*scpt->action)(asc, status, ss, ir)) {
regs->asc_cmd = scpt->command;
asc->script = scpt->next;
}
goto done;
}
/* check for message in or out */
if ((ir & ~ASC_INT_FC) == ASC_INT_BS) {
register int len, fifo;
state = &asc->st[asc->target];
switch (ASC_PHASE(status)) {
case ASC_PHASE_MSG_IN:
break;
case ASC_PHASE_MSG_OUT:
regs->asc_fifo = state->msg_out;
state->msg_out = SCSI_NO_OP;
regs->asc_cmd = ASC_CMD_XFER_INFO;
goto done;
case ASC_PHASE_STATUS:
/* probably an error in the SCSI command */
asc->script = &asc_scripts[SCRIPT_GET_STATUS];
regs->asc_cmd = ASC_CMD_I_COMPLETE;
goto done;
default:
goto abort;
}
if (state->script)
goto abort;
/* check for DMA in progress */
ASC_TC_GET(regs, len);
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
/* flush any data in the FIFO */
if (fifo) {
printf("asc_intr: suspend flags %x dmalen %d len %d fifo %d\n",
state->flags, state->dmalen,
len, fifo); /* XXX */
len += fifo;
regs->asc_cmd = ASC_CMD_FLUSH;
MachEmptyWriteBuffer();
}
if (len) {
/* save number of bytes still to be sent or received */
state->dmaresid = len;
/* setup state to resume to */
if (state->flags & DMA_IN)
state->script =
&asc_scripts[SCRIPT_RESUME_DMA_IN];
else if (state->flags & DMA_OUT)
state->script =
&asc_scripts[SCRIPT_RESUME_DMA_OUT];
else
state->script = asc->script;
} else {
/* setup state to resume to */
if (state->flags & DMA_IN)
state->script = &asc_scripts[SCRIPT_RESUME_IN];
else if (state->flags & DMA_OUT)
state->script = &asc_scripts[SCRIPT_RESUME_OUT];
else
state->script = asc->script;
}
/* setup to receive a message */
asc->script = &asc_scripts[SCRIPT_MSG_IN];
state->msglen = 0;
regs->asc_cmd = ASC_CMD_XFER_INFO;
goto done;
}
/* check for SCSI bus reset */
if (ir & ASC_INT_RESET) {
register int i;
printf("asc%d: SCSI bus reset!!\n", asc - asc_softc);
/* need to flush any pending commands */
for (i = 0; i < ASC_NCMD; i++) {
if (!asc->cmd[i])
continue;
asc->st[i].error = EIO;
asc_end(asc, 0, 0, 0);
}
/* rearbitrate synchronous offset */
for (i = 0; i < ASC_NCMD; i++) {
asc->st[i].sync_offset = 0;
asc->st[i].flags = 0;
}
asc->target = -1;
return;
}
/* check for command errors */
if (ir & ASC_INT_ILL)
goto abort;
/* check for disconnect */
if (ir & ASC_INT_DISC) {
state = &asc->st[asc->target];
if (state->flags & DISCONN) {
if (state->script)
goto abort;
state->script = asc->script;
asc->target = -1;
asc->state = ASC_STATE_RESEL;
asc->script = &asc_scripts[SCRIPT_RESEL];
regs->asc_cmd = ASC_CMD_ENABLE_SEL;
goto done;
}
switch (ASC_SS(ss)) {
case 0: /* device did not respond */
state->error = ENXIO;
asc_end(asc, status, ss, ir);
return;
default:
goto abort;
}
}
/* check for reselect */
if (ir & ASC_INT_RESEL) {
unsigned fifo, id, msg;
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
if (fifo < 2)
goto abort;
/* read unencoded SCSI ID and convert to binary */
msg = regs->asc_fifo & asc->myidmask;
for (id = 0; (msg & 1) == 0; id++)
msg >>= 1;
/* read identify message */
msg = regs->asc_fifo;
#ifdef DEBUG
if (asc_logp == asc_log)
asc_log[NLOG - 1].msg = msg;
else
asc_logp[-1].msg = msg;
#endif
if (asc->state != ASC_STATE_RESEL)
goto abort;
asc->state = ASC_STATE_BUSY;
asc->target = id;
state = &asc->st[id];
asc->script = state->script;
state->script = (script_t *)0;
if (!(state->flags & DISCONN))
goto abort;
state->flags &= ~DISCONN;
regs->asc_cmd = ASC_CMD_MSG_ACPT;
goto done;
}
/* check if we are being selected as a target */
if (ir & (ASC_INT_SEL | ASC_INT_SEL_ATN))
goto abort;
/* must be just a ASC_INT_FC */
done:
MachEmptyWriteBuffer();
if (regs->asc_status & ASC_CSR_INT)
goto again;
return;
abort:
#ifdef DEBUG
asc_DumpLog("asc_intr");
#endif
#if 0
panic("asc_intr");
#else
for (;;);
#endif
}
/*
* All the many little things that the interrupt
* routine might switch to.
*/
/* ARGSUSED */
static int
script_nop(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
return (1);
}
/* ARGSUSED */
static int
asc_get_status(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register int data;
/*
* Get the last two bytes in the FIFO.
*/
if ((data = regs->asc_flags & ASC_FLAGS_FIFO_CNT) != 2) {
printf("asc_get_status: fifo cnt %d\n", data); /* XXX */
if (data < 2) {
asc->regs->asc_cmd = ASC_CMD_MSG_ACPT;
return (0);
}
do {
data = regs->asc_fifo;
} while ((regs->asc_flags & ASC_FLAGS_FIFO_CNT) > 2);
}
/* save the status byte */
asc->st[asc->target].statusByte = data = regs->asc_fifo;
#ifdef DEBUG
if (asc_logp == asc_log)
asc_log[NLOG - 1].msg = data;
else
asc_logp[-1].msg = data;
#endif
/* get the (presumed) command_complete message */
if ((data = regs->asc_fifo) == SCSI_COMMAND_COMPLETE)
return (1);
#ifdef DEBUG
printf("asc_get_status: status %x cmd %x\n",
asc->st[asc->target].statusByte, data);
asc_DumpLog("asc_get_status");
#endif
return (0);
}
/* ARGSUSED */
static int
asc_end(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register ScsiCmd *scsicmd;
register State *state;
register int i, target;
asc->state = ASC_STATE_IDLE;
target = asc->target;
asc->target = -1;
scsicmd = asc->cmd[target];
asc->cmd[target] = (ScsiCmd *)0;
state = &asc->st[target];
#ifdef DEBUG
if (asc_debug > 1) {
printf("asc_end: %s target %d cmd %x err %d resid %d\n",
scsicmd->sd->sd_driver->d_name, target,
scsicmd->cmd[0], state->error, state->buflen);
}
#endif
#ifdef DIAGNOSTIC
if (target < 0 || !scsicmd)
panic("asc_end");
#endif
/* look for disconnected devices */
for (i = 0; i < ASC_NCMD; i++) {
if (!asc->cmd[i] || !(asc->st[i].flags & DISCONN))
continue;
asc->regs->asc_cmd = ASC_CMD_ENABLE_SEL;
asc->state = ASC_STATE_RESEL;
asc->script = &asc_scripts[SCRIPT_RESEL];
break;
}
/* look for another device that is ready */
for (i = 0; i < ASC_NCMD; i++) {
/* don't restart a disconnected command */
if (!asc->cmd[i] || (asc->st[i].flags & DISCONN))
continue;
asc_startcmd(asc, i);
break;
}
/* signal device driver that the command is done */
(*scsicmd->sd->sd_driver->d_done)(scsicmd->unit, state->error,
state->buflen, state->statusByte);
return (0);
}
/* ARGSUSED */
static int
asc_dma_in(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int len, fifo;
/* check for previous chunk in buffer */
if (!(state->flags & FIRST_DMA)) {
/*
* Only count bytes that have been copied to memory.
* There may be some bytes in the FIFO if synchonous transfers
* are in progress.
*/
ASC_TC_GET(regs, len);
len = state->dmalen - len;
bcopy(state->dmaBufAddr, state->buf, len);
state->buf += len;
state->buflen -= len;
} else
state->flags &= ~FIRST_DMA;
/* setup to start reading next chunk */
len = state->buflen;
if (len > state->dmaBufSize)
len = state->dmaBufSize;
state->dmalen = len;
*asc->dmar = ASC_DMA_ADDR(state->dmaBufAddr);
ASC_TC_PUT(regs, len);
if (len != state->buflen) {
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
asc->script = &asc_scripts[SCRIPT_RESUME_IN];
return (0);
}
return (1);
}
/* ARGSUSED */
static int
asc_last_dma_in(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int len, fifo;
/* copy data from buffer to main memory */
ASC_TC_GET(regs, len);
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
#ifdef DEBUG
if (asc_debug > 2 || len || fifo) /* XXX */
printf("asc_last_dma_in: buflen %d dmalen %d tc %d fifo %d\n",
state->buflen, state->dmalen, len, fifo);
#endif
if (fifo) {
regs->asc_cmd = ASC_CMD_FLUSH;
MachEmptyWriteBuffer();
}
len = state->dmalen - len;
state->buflen -= len;
bcopy(state->dmaBufAddr, state->buf, len);
return (1);
}
/* ARGSUSED */
static int
asc_resume_dma_in(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int len, off;
/* setup to finish reading the current chunk */
len = state->dmaresid;
off = state->dmalen - len;
if ((off & 1) && state->sync_offset) {
printf("asc_resume_dma_in: odd xfer dmalen %d len %d off %d\n",
state->dmalen, len, off); /* XXX */
regs->asc_res_fifo = state->dmaBufAddr[off];
}
*asc->dmar = ASC_DMA_ADDR(state->dmaBufAddr + off);
ASC_TC_PUT(regs, len);
if (state->dmalen != state->buflen) {
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
asc->script = &asc_scripts[SCRIPT_RESUME_IN];
return (0);
}
return (1);
}
/* ARGSUSED */
static int
asc_dma_out(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int len, fifo;
if (!(state->flags & FIRST_DMA)) {
/* check to be sure previous chunk was finished */
ASC_TC_GET(regs, len);
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
if (len || fifo)
printf("asc_dma_out: buflen %d dmalen %d tc %d fifo %d\n",
state->buflen, state->dmalen, len, fifo); /* XXX */
len += fifo;
len = state->dmalen - len;
state->buflen -= len;
state->buf += len;
/* setup for this chunck */
len = state->buflen;
if (len > state->dmaBufSize)
len = state->dmaBufSize;
state->dmalen = len;
bcopy(state->buf, state->dmaBufAddr, len);
*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr);
} else
state->flags &= ~FIRST_DMA;
#ifdef DEBUG
if (asc_debug > 2)
printf("asc_dma_out: dmalen %d fifo %d\n",
state->dmalen,
regs->asc_flags & ASC_FLAGS_FIFO_CNT);
#endif
len = state->dmalen;
ASC_TC_PUT(regs, len);
/* check for next chunk */
if (len != state->buflen) {
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
asc->script = &asc_scripts[SCRIPT_RESUME_OUT];
return (0);
}
return (1);
}
/* ARGSUSED */
static int
asc_last_dma_out(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int len, fifo;
len = state->dmalen;
ASC_TC_GET(regs, len);
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
#ifdef DEBUG
if (asc_debug > 2)
printf("asc_last_dma_out: dmalen %d tc %d fifo %d\n",
state->dmalen, len, fifo);
#endif
if (len || fifo)
printf("asc_last_dma_out: buflen %d dmalen %d tc %d fifo %d\n",
state->buflen, state->dmalen, len, fifo); /* XXX */
len += fifo;
len = state->dmalen - len;
state->buflen -= len;
return (1);
}
/* ARGSUSED */
static int
asc_resume_dma_out(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int len, off;
/* setup to finish writing this chunk */
len = state->dmaresid;
off = state->dmalen - len;
if (off & 1) {
printf("asc_resume_dma_out: odd xfer dmalen %d len %d off %d\n",
state->dmalen, len, off); /* XXX */
regs->asc_fifo = state->dmaBufAddr[off];
off++;
len--;
}
*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr + off);
ASC_TC_PUT(regs, len);
if (state->dmalen != state->buflen) {
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
asc->script = &asc_scripts[SCRIPT_RESUME_OUT];
return (0);
}
return (1);
}
/* ARGSUSED */
static int
asc_sendsync(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
/*
* Phase is MSG_OUT here.
* Try sync negotiation, unless prohibited
*/
regs->asc_fifo = SCSI_EXTENDED_MSG;
MachEmptyWriteBuffer();
regs->asc_fifo = 3;
MachEmptyWriteBuffer();
regs->asc_fifo = SCSI_SYNCHRONOUS_XFER;
MachEmptyWriteBuffer();
regs->asc_fifo = SCSI_MIN_PERIOD;
MachEmptyWriteBuffer();
regs->asc_fifo = ASC_MAX_OFFSET;
return (1);
}
/* ARGSUSED */
static int
asc_replysync(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
#ifdef DEBUG
if (asc_debug > 2)
printf("asc_replysync: %x %x\n",
asc_to_scsi_period[state->sync_period],
state->sync_offset);
#endif
/* send synchronous transfer in response to a request */
regs->asc_fifo = SCSI_EXTENDED_MSG;
MachEmptyWriteBuffer();
regs->asc_fifo = 3;
MachEmptyWriteBuffer();
regs->asc_fifo = SCSI_SYNCHRONOUS_XFER;
MachEmptyWriteBuffer();
regs->asc_fifo = asc_to_scsi_period[state->sync_period];
MachEmptyWriteBuffer();
regs->asc_fifo = state->sync_offset;
regs->asc_cmd = ASC_CMD_XFER_INFO;
/* return to the appropriate script */
if (!state->script) {
#ifdef DEBUG
asc_DumpLog("asc_replsync");
#endif
panic("asc_replysync");
}
asc->script = state->script;
state->script = (script_t *)0;
return (0);
}
/* ARGSUSED */
static int
asc_recvmsg(asc, status, ss, ir)
register asc_softc_t asc;
register int status, ss, ir;
{
register asc_regmap_t *regs = asc->regs;
register State *state = &asc->st[asc->target];
register int msg;
int i;
/* read one message byte */
msg = regs->asc_fifo;
#ifdef DEBUG
if (asc_logp == asc_log)
asc_log[NLOG - 1].msg = msg;
else
asc_logp[-1].msg = msg;
#endif
/* check for multi-byte message */
if (state->msglen != 0) {
/* first byte is the message length */
if (state->msglen < 0) {
state->msglen = msg;
return (1);
}
if (state->msgcnt >= state->msglen)
goto abort;
state->msg_in[state->msgcnt++] = msg;
/* did we just read the last byte of the message? */
if (state->msgcnt != state->msglen)
return (1);
/* process an extended message */
#ifdef DEBUG
if (asc_debug > 2)
printf("asc_recvmsg: msg %x %x %x\n",
state->msg_in[0],
state->msg_in[1],
state->msg_in[2]);
#endif
switch (state->msg_in[0]) {
case SCSI_SYNCHRONOUS_XFER:
state->flags |= DID_SYNC;
state->sync_offset = state->msg_in[2];
/* convert SCSI period to ASC period */
i = state->msg_in[1] / 10;
if (i < ASC_MIN_PERIOD)
i = ASC_MIN_PERIOD;
else if (i >= ASC_MAX_PERIOD) {
/* can't do sync transfer, period too long */
printf("asc%d: SCSI device %d: sync xfer period too long (%d)\n",
asc - asc_softc, asc->target, i);
i = ASC_MAX_PERIOD;
state->sync_offset = 0;
}
if ((i * 10) != state->msg_in[1])
i++;
state->sync_period = i & 0x1F;
/*
* If this is a request, check minimums and
* send back an acknowledge.
*/
if (!(state->flags & TRY_SYNC)) {
regs->asc_cmd = ASC_CMD_SET_ATN;
MachEmptyWriteBuffer();
if (state->sync_period < ASC_MIN_PERIOD)
state->sync_period =
ASC_MIN_PERIOD;
if (state->sync_offset > ASC_MAX_OFFSET)
state->sync_offset =
ASC_MAX_OFFSET;
asc->script = &asc_scripts[SCRIPT_REPLY_SYNC];
regs->asc_syn_p = state->sync_period;
regs->asc_syn_o = state->sync_offset;
regs->asc_cmd = ASC_CMD_MSG_ACPT;
return (0);
}
regs->asc_syn_p = state->sync_period;
regs->asc_syn_o = state->sync_offset;
goto done;
default:
printf("asc%d: SCSI device %d: rejecting extended message 0x%x\n",
asc - asc_softc, asc->target,
state->msg_in[0]);
goto reject;
}
}
/* process first byte of a message */
#ifdef DEBUG
if (asc_debug > 2)
printf("asc_recvmsg: msg %x\n", msg);
#endif
switch (msg) {
#if 0
case SCSI_MESSAGE_REJECT:
printf(" did not like SYNCH xfer "); /* XXX */
state->flags |= DID_SYNC;
regs->asc_cmd = ASC_CMD_MSG_ACPT;
status = asc_wait(regs, ASC_CSR_INT);
ir = regs->asc_intr;
/* some just break out here, some dont */
if (ASC_PHASE(status) == ASC_PHASE_MSG_OUT) {
regs->asc_fifo = SCSI_ABORT;
regs->asc_cmd = ASC_CMD_XFER_INFO;
status = asc_wait(regs, ASC_CSR_INT);
ir = regs->asc_intr;
}
if (ir & ASC_INT_DISC) {
asc_end(asc, status, 0, ir);
return (0);
}
goto status;
#endif
case SCSI_EXTENDED_MSG: /* read an extended message */
/* setup to read message length next */
state->msglen = -1;
state->msgcnt = 0;
return (1);
case SCSI_NO_OP:
break;
case SCSI_SAVE_DATA_POINTER:
/* expect another message */
return (1);
case SCSI_RESTORE_POINTERS:
/*
* Need to do the following if resuming synchonous data in
* on an odd byte boundary.
regs->asc_cnfg2 |= ASC_CNFG2_RFB;
*/
break;
case SCSI_DISCONNECT:
if (state->flags & DISCONN)
goto abort;
state->flags |= DISCONN;
break;
default:
printf("asc%d: SCSI device %d: rejecting message 0x%x\n",
asc - asc_softc, asc->target, msg);
reject:
/* request a message out before acknowledging this message */
state->msg_out = SCSI_MESSAGE_REJECT;
regs->asc_cmd = ASC_CMD_SET_ATN;
MachEmptyWriteBuffer();
}
done:
/* return to original script */
regs->asc_cmd = ASC_CMD_MSG_ACPT;
if (!state->script) {
abort:
#ifdef DEBUG
asc_DumpLog("asc_recvmsg");
#endif
panic("asc_recvmsg");
}
asc->script = state->script;
state->script = (script_t *)0;
return (0);
}
#ifdef DEBUG
asc_DumpLog(str)
char *str;
{
register struct asc_log *lp;
register u_int status;
printf("asc: %s: cmd %x bn %d cnt %d\n", str, asc_debug_cmd,
asc_debug_bn, asc_debug_sz);
lp = asc_logp + 1;
if (lp > &asc_log[NLOG])
lp = asc_log;
while (lp != asc_logp) {
status = lp->status;
printf("asc%d tgt %d status %x ss %x ir %x cond %d:%x msg %x\n",
status >> 24,
lp->target,
(status >> 16) & 0xFF,
(status >> 8) & 0xFF,
status & 0XFF,
lp->state,
asc_scripts[lp->state].condition,
lp->msg);
if (++lp >= &asc_log[NLOG])
lp = asc_log;
}
}
#endif
#endif /* NASC > 0 */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.