/* $NetBSD: asc.c,v 1.48 1998/10/10 00:28:30 thorpej Exp $ */ /*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Ralph Campbell and Rick Macklem. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)asc.c 8.3 (Berkeley) 7/3/94 */ /* * 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 #if NASC > 0 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /*#define readback(a) { register int foo; wbflush(); foo = (a); }*/ #define readback(a) { register int foo; foo = (a); } /* * In 4ns ticks. */ int asc_to_scsi_period[] = { 32, 33, 34, 35, 5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, }; /* * Debugging log of SCSI operations. */ #ifdef DEBUG int asc_debug = 1; int asc_debug_cmd; int asc_debug_bn; int asc_debug_sz; #define NLOG 32 struct asc_log { u_int status; u_char state; u_char msg; int target; int resid; } asc_log[NLOG], *asc_logp = asc_log; #define PACK(unit, status, ss, ir) \ ((unit << 24) | (status << 16) | (ss << 8) | ir) void asc_DumpLog __P((char *str)); #endif /* * Script, scsi state, and device softc structure declarations. * script pointers occur in both scsi state and the softc, * so they are defined first. */ /* * 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. */ struct asc_softc; typedef struct script { int condition; /* expected state at interrupt time */ int (*action) /* extra operations */ __P((register struct asc_softc *asc, register int status, register int ss, register int ir)); int command; /* command to the chip */ struct script *next; /* index into asc_scripts for next state */ } script_t; /* * script definitions */ /* Matching on the condition value */ #define SCRIPT_MATCH(ir, csr) ((ir) | (((csr) & 0x67) << 8)) /* * A typedef for a script function, to use in forward declarations. */ typedef int script_fn_t __P((register struct asc_softc *asc, register int status, register int ss, register int ir)); /* forward decls of script actions */ static script_fn_t script_nop; /* when nothing needed */ static script_fn_t asc_end; /* all come to an end */ static script_fn_t asc_get_status; /* get status from target */ static script_fn_t asc_dma_in; /* start reading data from target */ static script_fn_t asc_last_dma_in; /* cleanup after all data is read */ static script_fn_t asc_resume_in; /* resume data in after a message */ static script_fn_t asc_resume_dma_in; /* resume DMA after a disconnect */ static script_fn_t asc_dma_out; /* send data to target via dma */ static script_fn_t asc_last_dma_out; /* cleanup after all data is written */ static script_fn_t asc_resume_out; /* resume data out after a message */ static script_fn_t asc_resume_dma_out; /* resume DMA after a disconnect */ static script_fn_t asc_sendsync; /* negotiate sync xfer */ static script_fn_t asc_replysync; /* negotiate sync xfer */ static script_fn_t asc_msg_in; /* process a message byte */ static script_fn_t asc_disconnect; /* process an expected disconnect */ /* Define the index into asc_scripts for various state transitions */ #define SCRIPT_DATA_IN 0 #define SCRIPT_CONTINUE_IN 2 #define SCRIPT_DATA_OUT 3 #define SCRIPT_CONTINUE_OUT 5 #define SCRIPT_SIMPLE 6 #define SCRIPT_GET_STATUS 7 #define SCRIPT_DONE 8 #define SCRIPT_MSG_IN 9 #define SCRIPT_REPLY_SYNC 11 #define SCRIPT_TRY_SYNC 12 #define SCRIPT_DISCONNECT 15 #define SCRIPT_RESEL 16 #define SCRIPT_RESUME_IN 17 #define SCRIPT_RESUME_DMA_IN 18 #define SCRIPT_RESUME_OUT 19 #define SCRIPT_RESUME_DMA_OUT 20 #define SCRIPT_RESUME_NO_DATA 21 /* * Scripts */ script_t asc_scripts[] = { /* start data in */ {SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, SCSI_PHASE_DATAI), /* 0 */ asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_IN + 1]}, {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_STATUS), /* 1 */ asc_last_dma_in, ASC_CMD_I_COMPLETE, &asc_scripts[SCRIPT_GET_STATUS]}, /* continue data in after a chunk is finished */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_DATAI), /* 2 */ asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_IN + 1]}, /* start data out */ {SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, SCSI_PHASE_DATAO), /* 3 */ asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_OUT + 1]}, {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_STATUS), /* 4 */ asc_last_dma_out, ASC_CMD_I_COMPLETE, &asc_scripts[SCRIPT_GET_STATUS]}, /* continue data out after a chunk is finished */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_DATAO), /* 5 */ asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_OUT + 1]}, /* simple command with no data transfer */ {SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, SCSI_PHASE_STATUS), /* 6 */ script_nop, ASC_CMD_I_COMPLETE, &asc_scripts[SCRIPT_GET_STATUS]}, /* get status and finish command */ {SCRIPT_MATCH(ASC_INT_FC, SCSI_PHASE_MSG_IN), /* 7 */ asc_get_status, ASC_CMD_MSG_ACPT, &asc_scripts[SCRIPT_DONE]}, {SCRIPT_MATCH(ASC_INT_DISC, 0), /* 8 */ asc_end, ASC_CMD_NOP, &asc_scripts[SCRIPT_DONE]}, /* message in */ {SCRIPT_MATCH(ASC_INT_FC, SCSI_PHASE_MSG_IN), /* 9 */ asc_msg_in, ASC_CMD_MSG_ACPT, &asc_scripts[SCRIPT_MSG_IN + 1]}, {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_MSG_IN), /* 10 */ script_nop, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_MSG_IN]}, /* send synchonous negotiation reply */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_MSG_OUT), /* 11 */ asc_replysync, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_REPLY_SYNC]}, /* try to negotiate synchonous transfer parameters */ {SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, SCSI_PHASE_MSG_OUT), /* 12 */ asc_sendsync, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_TRY_SYNC + 1]}, {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_MSG_IN), /* 13 */ script_nop, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_MSG_IN]}, {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_COMMAND), /* 14 */ script_nop, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_RESUME_NO_DATA]}, /* handle a disconnect */ {SCRIPT_MATCH(ASC_INT_DISC, SCSI_PHASE_DATAO), /* 15 */ asc_disconnect, ASC_CMD_ENABLE_SEL, &asc_scripts[SCRIPT_RESEL]}, /* reselect sequence: this is just a placeholder so match fails */ {SCRIPT_MATCH(0, SCSI_PHASE_MSG_IN), /* 16 */ script_nop, ASC_CMD_MSG_ACPT, &asc_scripts[SCRIPT_RESEL]}, /* resume data in after a message */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_DATAI), /* 17 */ asc_resume_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_IN + 1]}, /* resume partial DMA data in after a message */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_DATAI), /* 18 */ asc_resume_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, SCSI_PHASE_DATAO), /* 19 */ asc_resume_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_OUT + 1]}, /* resume partial DMA data out after a message */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_DATAO), /* 20 */ asc_resume_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_OUT + 1]}, /* resume after a message when there is no more data */ {SCRIPT_MATCH(ASC_INT_BS, SCSI_PHASE_STATUS), /* 21 */ script_nop, ASC_CMD_I_COMPLETE, &asc_scripts[SCRIPT_GET_STATUS]}, }; #include /* * Internal forward declarations. */ static void asc_reset __P((asc_softc_t asc, asc_regmap_t *regs)); static void asc_startcmd __P((asc_softc_t asc, int target)); static void asc_timeout __P((void *arg)); #ifdef USE_NEW_SCSI /* Glue to the machine-independent scsi */ struct scsipi_adapter asc_switch = { NULL, /* XXX - asc_scsi_cmd */ /*XXX*/ minphys, /* no max transfer size; DMA engine deals */ NULL, /* scsipi_ioctl */ }; struct scsipi_device asc_dev = { /*XXX*/ NULL, /* Use default error handler */ /*XXX*/ NULL, /* have a queue, served by this */ /*XXX*/ NULL, /* have no async handler */ /*XXX*/ NULL, /* Use default 'done' routine */ }; #endif /* * Definition of the controller for the old auto-configuration program. */ void asc_start __P((register ScsiCmd *scsicmd)); int asc_intr __P ((void *asc)); struct pmax_driver ascdriver = { "asc", NULL, asc_start, 0, asc_intr, }; void asc_minphys __P((struct buf *bp)); extern struct cfdriver asc_cd; /* * bus-parent shared attach function */ void ascattach(asc, bus_speed) register asc_softc_t asc; int bus_speed; { register asc_regmap_t *regs; int id, s; int unit; unit = asc->sc_dev.dv_unit; /* * Set up machine dependencies. * (1) timing based on turbochannel frequency */ /* dma setup done in parent-specific attach code */ /* * Now for timing. The 3max has a 25Mhz tb whereas the 3min and * maxine are 12.5Mhz. */ switch (bus_speed) { case ASC_SPEED_25_MHZ: asc->min_period = ASC_MIN_PERIOD25; asc->max_period = ASC_MAX_PERIOD25; asc->ccf = ASC_CCF(25); asc->timeout_250 = ASC_TIMEOUT_250(25, asc->ccf); asc->tb_ticks = 10; break; case ASC_SPEED_12_5_MHZ: default: asc->min_period = ASC_MIN_PERIOD12; asc->max_period = ASC_MAX_PERIOD12; asc->ccf = ASC_CCF(13); asc->timeout_250 = ASC_TIMEOUT_250(13, asc->ccf); asc->tb_ticks = 20; break; }; 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->sc_id = regs->asc_cnfg1 & ASC_CNFG1_MY_BUS_ID; asc->myidmask = ~(1 << asc->sc_id); 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); asc->sc_id = regs->asc_cnfg1 & ASC_CNFG1_MY_BUS_ID; #endif id = asc->sc_id; splx(s); /* Hack for old-sytle SCSI-device probe */ (void) pmax_add_scsi(&ascdriver, unit); printf(": target %d\n", id); #ifdef USE_NEW_SCSI /* * fill in the prototype scsi_link. */ asc->sc_link.scsipi_scsi.channel = SCSI_CHANNEL_ONLY_ONE; asc->sc_link.adapter_softc = asc; asc->sc_link.scsipi_scsi.adapter_target = asc->sc_id; asc->sc_link.adapter = &asc_switch; asc->sc_link.device = &asc_dev; asc->sc_link.openings = 2; asc->sc_link.scsipi_scsi.max_target = 7; asc->sc_link.type = BUS_SCSI; /* * Now try to attach all the sub-devices. */ config_found(self, &asc->sc_link, scsiprint); #endif /* USE_NEW_SCSI */ } /* * Per Fogelstrom's SCSI Driver breaks down request transfer size. */ void asc_minphys(bp) struct buf *bp; { /*XXX*/ } /* * 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 pmax_scsi_device *sdp = scsicmd->sd; register asc_softc_t asc = asc_cd.cd_devs[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, /*XXX*/ sdp->sd_driver->d_name); (*sdp->sd_driver->d_done)(scsicmd->unit, EBUSY, scsicmd->buflen, 0); splx(s); } asc->cmd[sdp->sd_drive] = scsicmd; /* * Kludge: use a 60 second timeout if data is being transfered, * otherwise use a 30 minute timeout. */ timeout(asc_timeout, scsicmd, hz * (scsicmd->buflen == 0 ? 1800 : 60)); asc_startcmd(asc, sdp->sd_drive); splx(s); } #ifdef USE_NEW_SCSI int asc_poll(asc, target) struct asc_softc *asc; int target; { struct scsipi_xfer *scsicmd = asc->cmd[target]; int count = scsicmd->timeout * 10; while(count) { if(asc->regs->asc_status &ASC_CSR_INT) { asc_intr(asc); } if(scsicmd->flags & ITSDONE) break; DELAY(5); count--; } if(count == 0) { scsicmd->error = XS_TIMEOUT; asc_end(asc, 0, 0, 0); } return COMPLETE; } #endif /*USE_NEW_SCSI*/ 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; tc_syncbus(); DELAY(25); /* spec says this is needed after reset */ regs->asc_cmd = ASC_CMD_NOP; tc_syncbus(); DELAY(25); /* * Set up various chip parameters */ regs->asc_ccf = asc->ccf; tc_syncbus(); DELAY(25); regs->asc_sel_timo = asc->timeout_250; /* restore our ID */ regs->asc_cnfg1 = asc->sc_id | ASC_CNFG1_P_CHECK; /* include ASC_CNFG2_SCSI2 if you want to allow SCSI II commands */ regs->asc_cnfg2 = /* ASC_CNFG2_RFB | ASC_CNFG2_SCSI2 | */ ASC_CNFG2_EPL; regs->asc_cnfg3 = 0; /* zero anything else */ ASC_TC_PUT(regs, 0); regs->asc_syn_p = asc->min_period; regs->asc_syn_o = 0; /* async for now */ tc_mb(); } /* * 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; /* * If a reselection is in progress, it is Ok to ignore it since * the ASC will automatically cancel the command and flush * the FIFO if the ASC is reselected before the command starts. * If we try to use ASC_CMD_DISABLE_SEL, we can hang the system if * a reselect occurs before starting the command. */ 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); } #endif /* Try to avoid reselect collisions */ if ((regs->asc_status & (ASC_CSR_INT|SCSI_PHASE_MSG_IN)) == (ASC_CSR_INT|SCSI_PHASE_MSG_IN)) { /* printf("asc_startcmd: possible reselect in progress\n"); */ return; } /* * Init the chip and target state. */ state->flags = state->flags & DID_SYNC; state->error = 0; state->script = (script_t *)0; state->msg_out = SCSI_NO_OP; len = scsicmd->cmdlen; state->dmalen = 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) { asc->script = &asc_scripts[SCRIPT_DATA_OUT]; state->buf = scsicmd->buf; state->flags |= DMA_OUT; } else { asc->script = &asc_scripts[SCRIPT_DATA_IN]; state->buf = scsicmd->buf; state->flags |= DMA_IN; } #ifdef DEBUG 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->sc_dev.dv_unit, 0, 0, asc_debug_cmd); asc_logp->target = asc->target; asc_logp->state = asc->script - asc_scripts; asc_logp->msg = SCSI_DIS_REC_IDENTIFY; asc_logp->resid = scsicmd->buflen; if (++asc_logp >= &asc_log[NLOG]) asc_logp = asc_log; #endif /* preload the FIFO with the message to be sent */ regs->asc_fifo = SCSI_DIS_REC_IDENTIFY; tc_mb(); /* initialize the DMA */ len = (*asc->dma_start)(asc, state, scsicmd->cmd, ASCDMA_WRITE, len, 0); ASC_TC_PUT(regs, len); readback(regs->asc_cmd); regs->asc_dbus_id = target; readback(regs->asc_dbus_id); regs->asc_syn_p = state->sync_period; readback(regs->asc_syn_p); regs->asc_syn_o = state->sync_offset; readback(regs->asc_syn_o); /* Try to avoid reselect collisions */ if ((regs->asc_status & (ASC_CSR_INT|SCSI_PHASE_MSG_IN)) == (ASC_CSR_INT|SCSI_PHASE_MSG_IN)) { /* printf("asc_startcmd: reselect in progress (before select)\n");*/ return; } if (state->flags & TRY_SYNC) regs->asc_cmd = len = ASC_CMD_SEL_ATN_STOP; else regs->asc_cmd = len = ASC_CMD_SEL_ATN | ASC_CMD_DMA; readback(regs->asc_cmd); /* Try to avoid reselect collisions */ if ((regs->asc_status & (ASC_CSR_INT|SCSI_PHASE_MSG_IN)) == (ASC_CSR_INT|SCSI_PHASE_MSG_IN)) { /* printf("asc_startcmd: reselect in progress after select\n");*/ return; } else { /* * Here's a potentially nasty but infrequent problem: a * reselect may have occurred, but did not interrupt. */ if (regs->asc_cmd != len && regs->asc_cmd == (ASC_CMD_NOP|ASC_CMD_DMA)) { if ((regs->asc_status & ASC_CSR_INT) == 0) { delay(250); if (regs->asc_status == SCSI_PHASE_MSG_IN) { printf("asc_startcmd: reselect failed to interrupt?\n"); /* XXXX THIS NEEDS FIXING */ } } } } } /* * Interrupt routine * Take interrupts from the chip * * Implementation: * Move along the current command's script if * all is well, invoke error handler if not. */ int asc_intr(sc) void *sc; { register asc_softc_t asc = (asc_softc_t) sc; register asc_regmap_t *regs = asc->regs; register State *state; register script_t *scpt; register int ss, ir, status; register unsigned char cmd_was; static int ill_cmd_count = 0; /* XXX */ /* collect ephemeral information */ status = regs->asc_status; again: ss = regs->asc_ss; cmd_was = regs->asc_cmd; /* drop spurious interrupts */ if ((status & ASC_CSR_INT) == 0) return (-1); /* XXX */ ir = regs->asc_intr; /* this resets the previous two: i.e.,*/ /* this re-latches CSR (and SSTEP) */ scpt = asc->script; #ifdef DEBUG asc_logp->status = PACK(asc->sc_dev.dv_unit, status, ss, ir); asc_logp->target = (asc->state == ASC_STATE_BUSY) ? asc->target : -1; asc_logp->state = scpt - asc_scripts; asc_logp->msg = cmd_was; asc_logp->resid = 0; 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 /* This must be done withing 250msec of disconnect */ if (ir & ASC_INT_DISC) { regs->asc_cmd = ASC_CMD_ENABLE_SEL; readback(regs->asc_cmd); } /* 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; readback(regs->asc_cmd); asc->script = scpt->next; } goto done; } /* * Check for parity error. * Hardware will automatically set ATN * to request the device for a MSG_OUT phase. */ if (status & ASC_CSR_PE) { printf("%s: SCSI device %d: incomming parity error seen\n", asc->sc_dev.dv_xname, asc->target); asc->st[asc->target].flags |= PARITY_ERR; } /* * Check for gross error. * Probably a bug in a device driver. */ if (status & ASC_CSR_GE) { printf("%s: SCSI device %d: gross error\n", asc->sc_dev.dv_xname, asc->target); goto abort; } /* 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 SCSI_PHASE_DATAI: if ((asc->script - asc_scripts) == SCRIPT_DATA_IN + 1 || (asc->script - asc_scripts) == SCRIPT_CONTINUE_IN) { /* * From the Mach driver: * After a reconnect and restart dma in, we * seem to have gotten an interrupt even though * the DMA is running. The Mach driver just * ignores this interrupt. */ ASC_TC_GET(regs, len); fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT; printf("asc_intr: ignoring strange interrupt"); printf(" tc %d fifo residue %d\n", len, fifo); goto done; } /* FALLTHROUGH */ case SCSI_PHASE_DATAO: ASC_TC_GET(regs, len); fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT; printf("asc_intr: data overrun: buflen %d dmalen %d tc %d fifo %d\n", state->buflen, state->dmalen, len, fifo); goto abort; case SCSI_PHASE_MSG_IN: break; case SCSI_PHASE_MSG_OUT: /* * Check for parity error. * Hardware will automatically set ATN * to request the device for a MSG_OUT phase. */ if (state->flags & PARITY_ERR) { state->flags &= ~PARITY_ERR; state->msg_out = SCSI_MESSAGE_PARITY_ERROR; /* reset message in counter */ state->msglen = 0; } else state->msg_out = SCSI_NO_OP; regs->asc_fifo = state->msg_out; regs->asc_cmd = ASC_CMD_XFER_INFO; readback(regs->asc_cmd); goto done; case SCSI_PHASE_STATUS: /* probably an error in the SCSI command */ asc->script = &asc_scripts[SCRIPT_GET_STATUS]; regs->asc_cmd = ASC_CMD_I_COMPLETE; readback(regs->asc_cmd); goto done; case SCSI_PHASE_COMMAND: /* * This seems to occur after the command is sent * following sync negotiation. The device still * wants more command data. The fifo appears to * to still have the unsent data - but the 53C94 * signaled TC. If the fifo still contains data, * transfer it, otherwise do a transfer pad. The * target should then continue through the rest of * the phases and complete normally. */ printf("asc_intr: tgt %d command phase TC zero", asc->target); if ((regs->asc_flags & ASC_FLAGS_FIFO_CNT) != 0) { printf(" with non-empty fifo %d\n", regs->asc_flags & ASC_FLAGS_FIFO_CNT); regs->asc_cmd = ASC_CMD_XFER_INFO; } else { printf("; padding command\n"); ASC_TC_PUT(regs, 0xff); regs->asc_cmd = ASC_CMD_XFER_PAD | ASC_CMD_DMA; } goto done; default: printf("asc_intr: target %d, unknown phase 0x%x\n", asc->target, status); goto abort; } if (state->script) { printf("asc_intr: target %d, incomplete script %p\n", asc->target, 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) { if (state->flags & DMA_OUT) { #ifdef ASC_DIAGNOSTIC printf("asc: DMA_OUT, fifo resid %d, len %d, flags 0x%x\n", fifo, len, state->flags); #endif /* ASC_DIAGNOSTIC */ len += fifo; } else if (state->flags & DMA_IN) { #ifdef ASC_DIAGNOSTIC printf("asc_intr: IN: dmalen %d len %d fifo %d\n", state->dmalen, len, fifo); /* XXX */ #endif /* ASC_DIAGNOSTIC */ } else printf("asc_intr: dmalen %d len %d fifo %d\n", state->dmalen, len, fifo); /* XXX */ regs->asc_cmd = ASC_CMD_FLUSH; tc_mb(); readback(regs->asc_cmd); DELAY(2); } if (len && (state->flags & DMA_IN_PROGRESS)) { /* save number of bytes still to be sent or received */ state->dmaresid = len; state->flags &= ~DMA_IN_PROGRESS; ASC_TC_PUT(regs, 0); #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif /* setup state to resume to */ if (state->flags & DMA_IN) { /* * Since the ASC_CNFG3_SRB bit of the * cnfg3 register bit is not set, * we just transferred an extra byte. * Since we can't resume on an odd byte * boundary, we copy the valid data out * and resume DMA at the start address. */ if (len & 1) { printf("asc_intr: msg in len %d (fifo %d)\n", len, fifo); /* XXX */ len = state->dmalen - len; goto do_in; } state->script = &asc_scripts[SCRIPT_RESUME_DMA_IN]; state->flags |= DMA_RESUME; } else if (state->flags & DMA_OUT) { state->script = &asc_scripts[SCRIPT_RESUME_DMA_OUT]; state->flags |= DMA_RESUME; } else state->script = asc->script; } else if (state->flags & DMA_IN) { if (len) { printf("asc_intr: 1: len %d (fifo %d)\n", len, fifo); /* XXX */ } /* setup state to resume to */ if (state->flags & DMA_IN_PROGRESS) { len = state->dmalen; state->flags &= ~DMA_IN_PROGRESS; do_in: state->dmalen = len; /* dma_end needs actual length */ (*asc->dma_end)(asc, state, ASCDMA_READ); state->buf += len; state->buflen -= len; } if (state->buflen) state->script = (state->flags & DMA_RESUME) ? &asc_scripts[SCRIPT_RESUME_DMA_IN] : &asc_scripts[SCRIPT_RESUME_IN]; else state->script = &asc_scripts[SCRIPT_RESUME_NO_DATA]; } else if (state->flags & DMA_OUT) { if (len) { #ifdef DEBUG printf("asc_intr: 2: len %d (fifo %d)\n", len, fifo); /* XXX */ #endif } /* * If this is the last chunk, the next expected * state is to get status. */ if (state->flags & DMA_IN_PROGRESS) { state->flags &= ~DMA_IN_PROGRESS; (*asc->dma_end)(asc, state, ASCDMA_WRITE); len = state->dmalen; state->buf += len; state->buflen -= len; } if (state->buflen) state->script = (state->flags & DMA_RESUME) ? &asc_scripts[SCRIPT_RESUME_DMA_OUT] : &asc_scripts[SCRIPT_RESUME_OUT]; else state->script = &asc_scripts[SCRIPT_RESUME_NO_DATA]; } else if (asc->script == &asc_scripts[SCRIPT_SIMPLE]) state->script = &asc_scripts[SCRIPT_RESUME_NO_DATA]; 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; readback(regs->asc_cmd); goto done; } /* check for SCSI bus reset */ if (ir & ASC_INT_RESET) { register int i; printf("%s: SCSI bus reset!!\n", asc->sc_dev.dv_xname); /* 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 0 ; /* XXX ??? */ } /* check for disconnect */ if (ir & ASC_INT_DISC) { state = &asc->st[asc->target]; switch (asc->script - asc_scripts) { case SCRIPT_DONE: case SCRIPT_DISCONNECT: /* * Disconnects can happen normally when the * command is complete with the phase being * either SCSI_PHASE_DATAO or SCSI_PHASE_MSG_IN. * The SCRIPT_MATCH() only checks for one phase * so we can wind up here. * Perform the appropriate operation, then proceed. */ if ((*scpt->action)(asc, status, ss, ir)) { regs->asc_cmd = scpt->command; readback(regs->asc_cmd); asc->script = scpt->next; } goto done; case SCRIPT_TRY_SYNC: case SCRIPT_SIMPLE: case SCRIPT_DATA_IN: case SCRIPT_DATA_OUT: /* one of the starting scripts */ if (ASC_SS(ss) == 0) { /* device did not respond */ if (regs->asc_flags & ASC_FLAGS_FIFO_CNT) { regs->asc_cmd = ASC_CMD_FLUSH; readback(regs->asc_cmd); } state->error = ENXIO; asc_end(asc, status, ss, ir); return 0 ; /* XXX ??? */ } /* FALLTHROUGH */ default: printf("%s: SCSI device %d: unexpected disconnect\n", asc->sc_dev.dv_xname, asc->target); #ifdef DEBUG asc_DumpLog("asc_disc"); #endif /* * On rare occasions my RZ24 does a disconnect during * data in phase and the following seems to keep it * happy. * XXX Should a scsi disk ever do this?? */ asc->script = &asc_scripts[SCRIPT_RESEL]; asc->state = ASC_STATE_RESEL; state->flags |= DISCONN; regs->asc_cmd = ASC_CMD_ENABLE_SEL; readback(regs->asc_cmd); return 0 ; /* XXX ??? */ } } /* mhitch - debug - check select/reselect collision */ if ((ir & ASC_INT_ILL) && (regs->asc_cmd & ASC_CMD_SEL_ATN)) { printf("asc_intr: Illegal command status %x ir %x\n", status, ir); /* Should process reselect? */ } /* check for illegal command */ if (ir & ASC_INT_ILL) { #ifdef ASC_DIAGNOSTIC printf("asc_intr: Illegal command status %x ir %x cmd %x ? %x\n", status, ir, regs->asc_cmd, asc_scripts[SCRIPT_MSG_IN].command); #endif /* * On a 5000/200, I see this frequently when using an RD52 * CDROM. The 53c94 doesn't seem to get the Message Accept * command, and generates an "Illegal Command" interrupt. * Re-issuing the Message Accept at this point seems to keep * things going. Don't allow this too many times in a row, * just to make sure we don't get hung up. mhitch */ if (ill_cmd_count++ != 3) { /* XXX */ regs->asc_cmd = ASC_CMD_MSG_ACPT; /* XXX */ readback(regs->asc_cmd); /* XXX */ goto done; /* XXX */ } /* XXX */ printf("asc_intr: Illegal command tgt %d\n", asc->target); goto abort; /* XXX */ } ill_cmd_count = 0; /* XXX */ /* check for reselect */ if (ir & ASC_INT_RESEL) { unsigned fifo, id, msg; fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT; if (fifo < 2) { printf("asc_intr: target %d, reselect, fifo %d too small for msg\n", asc->target, fifo); 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 /* * TC may have been initialized during a selection attempt. * Clear it to prevent possible confusion later. */ ASC_TC_PUT(regs,0); /* ensure TC clear */ 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)) { printf("asc_intr: reselect tgt %d, flags 0x%x not disconnected\n", asc->target, state->flags); goto abort; } state->flags &= ~DISCONN; regs->asc_syn_p = state->sync_period; regs->asc_syn_o = state->sync_offset; regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); goto done; } /* check if we are being selected as a target */ if (ir & (ASC_INT_SEL | ASC_INT_SEL_ATN)) { printf("asc_intr: host adaptor selected as target\n"); goto abort; } /* * 'ir' must be just ASC_INT_FC. * This is normal if canceling an ASC_ENABLE_SEL. */ done: tc_mb(); /* watch out for HW race conditions and setup & hold time violations */ ir = regs->asc_status; while (ir != (status = regs->asc_status)) ir = status; if (status & ASC_CSR_INT) goto again; return 0 ; /* XXX ??? */ abort: #ifdef DEBUG asc_DumpLog("asc_intr"); #endif #if 0 panic("asc_intr"); #else cpu_reboot(RB_NOSYNC, NULL); /* XXX */ #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: cmdreg %x, fifo cnt %d\n", regs->asc_cmd, data); /* XXX */ #ifdef DEBUG asc_DumpLog("get_status"); /* XXX */ #endif if (data < 2) { asc->regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(asc->regs->asc_cmd); 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]; untimeout(asc_timeout, scsicmd); #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; readback(asc->regs->asc_cmd); asc->state = ASC_STATE_RESEL; asc->script = &asc_scripts[SCRIPT_RESEL]; break; } #ifdef USE_NEW_SCSI if(scsicmd->error == XS_NOERROR && !(state->flags & CHECK_SENSE)) { if((state->statusByte & ST_MASK) == SCSI_CHECK) { struct scsipi_sense *ss = (void *)&state->cmd; /* Save return values */ scsicmd->resid = state->buflen; scsicmd->status = state->statusByte; /* Set up sense request command */ bzero(ss, sizeof(*ss)); ss->opcode = REQUEST_SENSE; ss->byte2 = sc_link->lun << 5; ss->length = sizeof(struct scsipi_sense_data); state->cmdlen = sizeof(*ss); state->buf = (vaddr_t)&scsicmd->sense; state->buflen = sizeof(struct scsipi_sense_data); state->flags |= CHECK_SENSE; MachFlushDCache(state->buf, state->buflen); asc->cmd[target] = scsicmd; asc_startcmd(asc, target); return(0); } } #endif /*USE_NEW_SCSI*/ /* * Look for another device that is ready. * May want to keep last one started and increment for fairness * rather than always starting at zero. */ 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; /* check for previous chunk in buffer */ if (state->flags & DMA_IN_PROGRESS) { /* * 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; state->dmalen = len; /* dma_end may need actual length */ (*asc->dma_end)(asc, state, ASCDMA_READ); state->buf += len; state->buflen -= len; } if (!(state->flags & DMA_IN_PROGRESS) && (regs->asc_flags & ASC_FLAGS_FIFO_CNT) != 0) { volatile int async_fifo_junk = 0; /* * If the target is asynchronous, the FIFO contains * a byte of garbage. (see the Mach mk84 53c94 driver, * where this occurs on tk-50s and exabytes.) * It also occurs on asynch disks like SCSI-1 disks. * Recover by reading the byte of junk from the fifo if, * and only if, the target is async. If the target is * synch, there is no junk, and reading the fifo * deadlocks our SCSI state machine. */ if (state->sync_offset == 0) async_fifo_junk = regs->asc_fifo; #ifdef ASC_DIAGNOSTIC printf("%s: asc_dma_in: FIFO count %x flags %x sync_offset %d", asc->sc_dev.dv_xname, regs->asc_flags, state->flags, state->sync_offset); if (state->sync_offset != 0) printf("\n"); else printf(" unexpected fifo data %x\n", async_fifo_junk); #ifdef DEBUG asc_DumpLog("asc_dma_in"); #endif /* DEBUG */ #endif /* ASC_DIAGNOSTIC */ } /* setup to start reading the next chunk */ len = state->buflen; #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif len = (*asc->dma_start)(asc, state, state->buf, ASCDMA_READ, len, 0); state->dmalen = len; ASC_TC_PUT(regs, len); #ifdef DEBUG if (asc_debug > 2) printf("asc_dma_in: buflen %d, len %d\n", state->buflen, len); #endif /* check for next chunk */ state->flags |= DMA_IN_PROGRESS; if (len != state->buflen) { regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_CONTINUE_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; ASC_TC_GET(regs, len); fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT; #ifdef DEBUG if (asc_debug > 2) printf("asc_last_dma_in: buflen %d dmalen %d tc %d fifo %d\n", state->buflen, state->dmalen, len, fifo); #endif if (fifo) { /* device must be trying to send more than we expect */ regs->asc_cmd = ASC_CMD_FLUSH; readback(regs->asc_cmd); } state->flags &= ~DMA_IN_PROGRESS; len = state->dmalen - len; state->dmalen = len; /* dma_end may need actual length */ (*asc->dma_end)(asc, state, ASCDMA_READ); state->buflen -= len; return (1); } /* ARGSUSED */ static int asc_resume_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; /* setup to start reading the next chunk */ len = state->buflen; #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif len = (*asc->dma_start)(asc, state, state->buf, ASCDMA_READ, len, 0); state->dmalen = len; ASC_TC_PUT(regs, len); #ifdef DEBUG if (asc_debug > 2) printf("asc_resume_in: buflen %d, len %d\n", state->buflen, len); #endif /* check for next chunk */ state->flags |= DMA_IN_PROGRESS; if (len != state->buflen) { regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_CONTINUE_IN]; return (0); } 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->buf[off]; } #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif len = (*asc->dma_start)(asc, state, state->buf + off, ASCDMA_READ, len, off); ASC_TC_PUT(regs, len); #ifdef DEBUG if (asc_debug > 2) printf("asc_resume_dma_in: buflen %d dmalen %d len %d off %d\n", state->dmalen, state->buflen, len, off); #endif /* check for next chunk */ state->flags |= DMA_IN_PROGRESS; state->flags &= ~DMA_RESUME; if (state->dmalen != state->buflen) { regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_CONTINUE_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 & DMA_IN_PROGRESS) { /* 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->buf += len; state->buflen -= len; } /* * Flush the fifo - sometimes there seems to be something left * in the fifo. Since the dma output has not been started, * the fifo is supposed to be empty. */ if (regs->asc_flags & ASC_FLAGS_FIFO_CNT) { while (regs->asc_flags & ASC_FLAGS_FIFO_CNT) regs->asc_fifo; } /* setup for this chunk */ len = state->buflen; #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif len = (*asc->dma_start)(asc, state, state->buf, ASCDMA_WRITE, len, 0); state->dmalen = len; ASC_TC_PUT(regs, len); #ifdef DEBUG if (asc_debug > 2) printf("asc_dma_out: buflen %d, len %d\n", state->buflen, len); #endif /* check for next chunk */ state->flags |= DMA_IN_PROGRESS; if (len != state->buflen) { regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_CONTINUE_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; ASC_TC_GET(regs, len); fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT; #ifdef DEBUG if (asc_debug > 2) printf("asc_last_dma_out: buflen %d dmalen %d tc %d fifo %d\n", state->buflen, state->dmalen, len, fifo); #endif if (fifo) { len += fifo; regs->asc_cmd = ASC_CMD_FLUSH; readback(regs->asc_cmd); printf("asc_last_dma_out: buflen %d dmalen %d tc %d fifo %d\n", state->buflen, state->dmalen, len, fifo); } state->flags &= ~DMA_IN_PROGRESS; len = state->dmalen - len; state->buflen -= len; return (1); } /* ARGSUSED */ static int asc_resume_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; /* setup for this chunk */ len = state->buflen; #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif len = (*asc->dma_start)(asc, state, state->buf, ASCDMA_WRITE, len, 0); state->dmalen = len; ASC_TC_PUT(regs, len); #ifdef DEBUG if (asc_debug > 2) printf("asc_resume_out: buflen %d, len %d\n", state->buflen, len); #endif /* check for next chunk */ state->flags |= DMA_IN_PROGRESS; if (len != state->buflen) { regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_CONTINUE_OUT]; return (0); } 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->buf[off]; off++; len--; } #ifdef DEBUG if (asc_logp == asc_log) asc_log[NLOG - 1].resid = len; else asc_logp[-1].resid = len; #endif /* XXX may result in redundant copy of data */ len = (*asc->dma_start)(asc, state, state->buf + off, ASCDMA_WRITE, len, off); ASC_TC_PUT(regs, len); #ifdef DEBUG if (asc_debug > 2) printf("asc_resume_dma_out: buflen %d dmalen %d len %d off %d\n", state->dmalen, state->buflen, len, off); #endif /* check for next chunk */ state->flags |= DMA_IN_PROGRESS; state->flags &= ~DMA_RESUME; if (state->dmalen != state->buflen) { regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_CONTINUE_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; register State *state = &asc->st[asc->target]; /* send the extended synchronous negotiation message */ regs->asc_fifo = SCSI_EXTENDED_MSG; tc_mb(); regs->asc_fifo = 3; tc_mb(); regs->asc_fifo = SCSI_SYNCHRONOUS_XFER; tc_mb(); regs->asc_fifo = SCSI_MIN_PERIOD; tc_mb(); regs->asc_fifo = ASC_MAX_OFFSET; /* state to resume after we see the sync reply message */ state->script = asc->script + 2; state->msglen = 0; 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] * asc->tb_ticks, state->sync_offset); #endif /* send synchronous transfer in response to a request */ regs->asc_fifo = SCSI_EXTENDED_MSG; tc_mb(); regs->asc_fifo = 3; tc_mb(); regs->asc_fifo = SCSI_SYNCHRONOUS_XFER; tc_mb(); regs->asc_fifo = asc_to_scsi_period[state->sync_period] * asc->tb_ticks; tc_mb(); regs->asc_fifo = state->sync_offset; regs->asc_cmd = ASC_CMD_XFER_INFO; readback(regs->asc_cmd); /* 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_msg_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 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) { printf("asc: msg_in too big, msgcnt %d msglen %d\n", 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_msg_in: 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] / asc->tb_ticks; if (i < asc->min_period) i = asc->min_period; else if (i >= asc->max_period) { /* can't do sync transfer, period too long */ printf("%s: SCSI device %d: sync xfer period too long (%d)\n", asc->sc_dev.dv_xname, asc->target, i); i = asc->max_period; state->sync_offset = 0; } if ((i * asc->tb_ticks) != 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; readback(regs->asc_cmd); 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; readback(regs->asc_syn_p); regs->asc_syn_o = state->sync_offset; readback(regs->asc_syn_o); regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); return (0); } regs->asc_syn_p = state->sync_period; readback(regs->asc_syn_p); regs->asc_syn_o = state->sync_offset; readback(regs->asc_syn_o); goto done; default: printf("%s: SCSI device %d: rejecting extended message 0x%x\n", asc->sc_dev.dv_xname, asc->target, state->msg_in[0]); goto reject; } } /* process first byte of a message */ #ifdef DEBUG if (asc_debug > 2) printf("asc_msg_in: 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; readback(regs->asc_cmd); status = asc_wait(regs, ASC_CSR_INT); ir = regs->asc_intr; /* some just break out here, some dont */ if (ASC_PHASE(status) == SCSI_PHASE_MSG_OUT) { regs->asc_fifo = SCSI_ABORT; regs->asc_cmd = ASC_CMD_XFER_INFO; readback(regs->asc_cmd); 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 /*0*/ 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) { printf("asc: disconnected target %d disconnecting again\n", asc->target); goto abort; } state->flags |= DISCONN; regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_DISCONNECT]; return (0); default: printf("%s: SCSI device %d: rejecting message 0x%x\n", asc->sc_dev.dv_xname, 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; readback(regs->asc_cmd); } done: /* return to original script */ regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); if (!state->script) { printf("asc_msg_in: target %d, no script?\n", asc->target); abort: #ifdef DEBUG asc_DumpLog("asc_msg_in"); #endif panic("asc_msg_in"); } asc->script = state->script; state->script = (script_t *)0; return (0); } /* ARGSUSED */ static int asc_disconnect(asc, status, ss, ir) register asc_softc_t asc; register int status, ss, ir; { int i; #ifdef DIAGNOSTIC /* later Mach driver checks for late asych disconnect here. */ register State *state = &asc->st[asc->target]; if (!(state->flags & DISCONN)) { printf("asc_disconnect: device %d: DISCONN not set!\n", asc->target); } #endif /*DIAGNOSTIC*/ asc->target = -1; asc->state = ASC_STATE_RESEL; /* * Look for another device that is ready. * May want to keep last one started and increment for fairness * rather than always starting at zero. */ 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); return (0); } return (1); } void asc_timeout(arg) void *arg; { int s = splbio(); ScsiCmd *scsicmd = (ScsiCmd *) arg; printf("asc_timeout: cmd %p drive %d\n", scsicmd, scsicmd->sd->sd_drive); #ifdef DEBUG asc_DumpLog("asc_timeout"); #endif #if 0 panic("asc_timeout"); #else cpu_reboot(RB_NOSYNC, NULL); /* XXX */ #endif splx(s); } #ifdef DEBUG void 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; do { status = lp->status; printf("asc%d tgt %d status %x ss %x ir %x cond %d:%x msg %x resid %d\n", status >> 24, lp->target, (status >> 16) & 0xFF, (status >> 8) & 0xFF, status & 0XFF, lp->state, asc_scripts[lp->state].condition, lp->msg, lp->resid); if (++lp >= &asc_log[NLOG]) lp = asc_log; } while (lp != asc_logp); } #endif /*DEBUG*/ #endif /* NASC > 0 */