/*- * 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 and Rick Macklem. * * %sccs.include.redist.c% * * @(#)asc.c 7.13 (Berkeley) 05/24/93 */ /* * 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 #define readback(a) { register int foo; foo = (a); } extern int pmax_boardtype; /* * 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, }; /* * 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 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) #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) | (((csr) & 0x67) << 8)) /* forward decls of script actions */ static int script_nop(); /* when nothing needed */ static int asc_end(); /* all come to an end */ static int asc_get_status(); /* get status from target */ static int asc_dma_in(); /* start reading data from target */ static int asc_last_dma_in(); /* cleanup after all data is read */ static int asc_resume_in(); /* resume data in after a message */ static int asc_resume_dma_in(); /* resume DMA after a disconnect */ static int asc_dma_out(); /* send data to target via dma */ static int asc_last_dma_out(); /* cleanup after all data is written */ static int asc_resume_out(); /* resume data out after a message */ static int asc_resume_dma_out(); /* resume DMA after a disconnect */ static int asc_sendsync(); /* negotiate sync xfer */ static int asc_replysync(); /* negotiate sync xfer */ static int asc_msg_in(); /* process a message byte */ static int 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_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, 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]}, /* continue data in after a chunk is finished */ {SCRIPT_MATCH(ASC_INT_BS, ASC_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, ASC_PHASE_DATAO), /* 3 */ asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA, &asc_scripts[SCRIPT_DATA_OUT + 1]}, {SCRIPT_MATCH(ASC_INT_BS, ASC_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, ASC_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, ASC_PHASE_STATUS), /* 6 */ 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), /* 7 */ asc_get_status, ASC_CMD_MSG_ACPT, &asc_scripts[SCRIPT_GET_STATUS + 1]}, {SCRIPT_MATCH(ASC_INT_DISC, 0), /* 8 */ asc_end, ASC_CMD_NOP, &asc_scripts[SCRIPT_GET_STATUS + 1]}, /* message in */ {SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 9 */ asc_msg_in, ASC_CMD_MSG_ACPT, &asc_scripts[SCRIPT_MSG_IN + 1]}, {SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_IN), /* 10 */ script_nop, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_MSG_IN]}, /* send synchonous negotiation reply */ {SCRIPT_MATCH(ASC_INT_BS, ASC_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, ASC_PHASE_MSG_OUT), /* 12 */ asc_sendsync, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_TRY_SYNC + 1]}, {SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_IN), /* 13 */ script_nop, ASC_CMD_XFER_INFO, &asc_scripts[SCRIPT_MSG_IN]}, {SCRIPT_MATCH(ASC_INT_BS, ASC_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, ASC_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, ASC_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, ASC_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, ASC_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, ASC_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, ASC_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, ASC_PHASE_STATUS), /* 21 */ script_nop, ASC_CMD_I_COMPLETE, &asc_scripts[SCRIPT_GET_STATUS]}, }; /* * 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 DMA_IN_PROGRESS 0x02 /* true if data DMA started */ #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 PARITY_ERR 0x80 /* true if parity error seen */ /* * 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 */ u_char *buff; /* RAM buffer address (uncached) */ 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 */ void (*dma_start)(); /* Start dma routine */ void (*dma_end)(); /* End dma routine */ u_char *dma_next; int dma_xfer; /* Dma len still to go */ int min_period; /* Min transfer period clk/byte */ int max_period; /* Max transfer period clk/byte */ int ccf; /* CCF, whatever that really is? */ int timeout_250; /* 250ms timeout */ int tb_ticks; /* 4ns. ticks/tb channel ticks */ } 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; /* * Dma operations. */ #define ASCDMA_READ 1 #define ASCDMA_WRITE 2 static void tb_dma_start(), tb_dma_end(), asic_dma_start(), asic_dma_end(); extern u_long asc_iomem; extern u_long asic_base; /* * 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; int bufsiz; 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); /* * Set up machine dependencies. * 1) how to do dma * 2) timing based on turbochannel frequency */ switch (pmax_boardtype) { case DS_3MIN: case DS_MAXINE: case DS_3MAXPLUS: if (unit == 0) { asc->buff = (u_char *)MACH_PHYS_TO_UNCACHED(asc_iomem); bufsiz = 8192; *((volatile int *)ASIC_REG_SCSI_DMAPTR(asic_base)) = -1; *((volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base)) = -1; *((volatile int *)ASIC_REG_SCSI_SCR(asic_base)) = 0; asc->dma_start = asic_dma_start; asc->dma_end = asic_dma_end; break; } /* * Fall through for turbochannel option. */ case DS_3MAX: default: asc->dmar = (volatile int *)(cp->pmax_addr + ASC_OFFSET_DMAR); asc->buff = (u_char *)(cp->pmax_addr + ASC_OFFSET_RAM); bufsiz = PER_TGT_DMA_SIZE; asc->dma_start = tb_dma_start; asc->dma_end = tb_dma_end; }; /* * Now for timing. The 3max has a 25Mhz tb whereas the 3min and * maxine are 12.5Mhz. */ switch (pmax_boardtype) { case DS_3MAX: case DS_3MAXPLUS: 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 DS_3MIN: case DS_MAXINE: 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->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. */ /* * 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 + bufsiz * i; asc->st[i].dmaBufSize = bufsiz; } 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; MachEmptyWriteBuffer(); DELAY(25); regs->asc_sel_timo = asc->timeout_250; /* restore our ID */ regs->asc_cnfg1 = asc->myid | 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 */ 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; /* * 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 /* * 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; /* * 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) { 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 - asc_softc, 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; MachEmptyWriteBuffer(); /* initialize the DMA */ (*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_WRITE); 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); if (state->flags & TRY_SYNC) regs->asc_cmd = ASC_CMD_SEL_ATN_STOP; else regs->asc_cmd = ASC_CMD_SEL_ATN | ASC_CMD_DMA; readback(regs->asc_cmd); } /* * 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; /* collect ephemeral information */ status = regs->asc_status; again: 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; 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 /* 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("asc%d: SCSI device %d: incomming parity error seen\n", asc - asc_softc, 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("asc%d: SCSI device %d: gross error\n", asc - asc_softc, 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 ASC_PHASE_DATAI: case ASC_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 ASC_PHASE_MSG_IN: break; case ASC_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 ASC_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; 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) { if (state->flags & DMA_OUT) len += fifo; else if (state->flags & DMA_IN) { u_char *cp; printf("asc_intr: IN: dmalen %d len %d fifo %d\n", state->dmalen, len, fifo); /* XXX */ len += fifo; cp = state->dmaBufAddr + (state->dmalen - len); while (fifo-- > 0) *cp++ = regs->asc_fifo; } else printf("asc_intr: dmalen %d len %d fifo %d\n", state->dmalen, len, fifo); /* XXX */ regs->asc_cmd = ASC_CMD_FLUSH; readback(regs->asc_cmd); DELAY(2); } if (len) { /* save number of bytes still to be sent or received */ state->dmaresid = len; #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); len = state->dmalen - len; goto do_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) { if (state->flags & DMA_IN_PROGRESS) { len = state->dmalen; do_in: state->flags &= ~DMA_IN_PROGRESS; (*asc->dma_end)(asc, state, ASCDMA_READ); bcopy(state->dmaBufAddr, state->buf, len); state->buf += len; state->buflen -= len; } if (state->buflen) state->script = &asc_scripts[SCRIPT_RESUME_IN]; else state->script = &asc_scripts[SCRIPT_RESUME_NO_DATA]; } else if (state->flags & DMA_OUT) { /* * 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 = &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("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]; switch (ASC_SS(ss)) { case 0: /* device did not respond */ /* check for one of the starting scripts */ switch (asc->script - asc_scripts) { case SCRIPT_TRY_SYNC: case SCRIPT_SIMPLE: case SCRIPT_DATA_IN: case SCRIPT_DATA_OUT: 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; } /* FALLTHROUGH */ default: printf("asc%d: SCSI device %d: unexpected disconnect\n", asc - asc_softc, asc->target); /* * 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; } } /* 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 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_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)) goto abort; /* * 'ir' must be just ASC_INT_FC. * This is normal if canceling an ASC_ENABLE_SEL. */ done: MachEmptyWriteBuffer(); /* 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; 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 */ asc_DumpLog("get_status"); /* XXX */ 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]; #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; } /* * 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->dma_end)(asc, state, ASCDMA_READ); ASC_TC_GET(regs, len); len = state->dmalen - len; bcopy(state->dmaBufAddr, state->buf, len); state->buf += len; state->buflen -= len; } /* setup to start reading the next chunk */ len = state->buflen; if (len > state->dmaBufSize) len = state->dmaBufSize; state->dmalen = len; (*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_READ); 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; /* copy data from buffer to main memory */ (*asc->dma_end)(asc, state, ASCDMA_READ); 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->buflen -= len; bcopy(state->dmaBufAddr, state->buf, 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; if (len > state->dmaBufSize) len = state->dmaBufSize; state->dmalen = len; (*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_READ); 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->dmaBufAddr[off]; } (*asc->dma_start)(asc, state, state->dmaBufAddr + off, ASCDMA_READ); 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; 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; } /* setup for this chunk */ len = state->buflen; if (len > state->dmaBufSize) len = state->dmaBufSize; state->dmalen = len; bcopy(state->buf, state->dmaBufAddr, len); (*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_WRITE); 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; if (len > state->dmaBufSize) len = state->dmaBufSize; state->dmalen = len; bcopy(state->buf, state->dmaBufAddr, len); (*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_WRITE); 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->dmaBufAddr[off]; off++; len--; } (*asc->dma_start)(asc, state, state->dmaBufAddr + off, ASCDMA_WRITE); 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; 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; 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; /* 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; MachEmptyWriteBuffer(); regs->asc_fifo = 3; MachEmptyWriteBuffer(); regs->asc_fifo = SCSI_SYNCHRONOUS_XFER; MachEmptyWriteBuffer(); regs->asc_fifo = asc_to_scsi_period[state->sync_period] * asc->tb_ticks; MachEmptyWriteBuffer(); 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) 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("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 * 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("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_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) == ASC_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 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; regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); asc->script = &asc_scripts[SCRIPT_DISCONNECT]; return (0); 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; readback(regs->asc_cmd); } done: /* return to original script */ regs->asc_cmd = ASC_CMD_MSG_ACPT; readback(regs->asc_cmd); if (!state->script) { 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; { register State *state = &asc->st[asc->target]; #ifdef DIAGNOSTIC if (!(state->flags & DISCONN)) { printf("asc_disconnect: device %d: DISCONN not set!\n", asc->target); } #endif asc->target = -1; asc->state = ASC_STATE_RESEL; return (1); } /* * DMA handling routines. For a turbochannel device, just set the dmar. * For the I/O ASIC, handle the actual DMA interface. */ static void tb_dma_start(asc, state, cp, flag) asc_softc_t asc; State *state; caddr_t cp; int flag; { if (flag == ASCDMA_WRITE) *asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(cp); else *asc->dmar = ASC_DMA_ADDR(cp); } static void tb_dma_end(asc, state, flag) asc_softc_t asc; State *state; int flag; { } static void asic_dma_start(asc, state, cp, flag) asc_softc_t asc; State *state; caddr_t cp; int flag; { register volatile u_int *ssr = (volatile u_int *) ASIC_REG_CSR(asic_base); u_int phys, nphys; /* stop DMA engine first */ *ssr &= ~ASIC_CSR_DMAEN_SCSI; *((volatile int *)ASIC_REG_SCSI_SCR(asic_base)) = 0; phys = MACH_CACHED_TO_PHYS(cp); cp = (caddr_t)pmax_trunc_page(cp + NBPG); nphys = MACH_CACHED_TO_PHYS(cp); asc->dma_next = cp; asc->dma_xfer = state->dmalen - (nphys - phys); *(volatile int *)ASIC_REG_SCSI_DMAPTR(asic_base) = ASIC_DMA_ADDR(phys); *(volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base) = ASIC_DMA_ADDR(nphys); if (flag == ASCDMA_READ) *ssr |= ASIC_CSR_SCSI_DIR | ASIC_CSR_DMAEN_SCSI; else *ssr = (*ssr & ~ASIC_CSR_SCSI_DIR) | ASIC_CSR_DMAEN_SCSI; MachEmptyWriteBuffer(); } static void asic_dma_end(asc, state, flag) asc_softc_t asc; State *state; int flag; { register volatile u_int *ssr = (volatile u_int *) ASIC_REG_CSR(asic_base); register volatile u_int *dmap = (volatile u_int *) ASIC_REG_SCSI_DMAPTR(asic_base); register u_short *to; register int w; int nb; *ssr &= ~ASIC_CSR_DMAEN_SCSI; to = (u_short *)MACH_PHYS_TO_CACHED(*dmap >> 3); *dmap = -1; *((volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base)) = -1; MachEmptyWriteBuffer(); if (flag == ASCDMA_READ) { MachFlushDCache(MACH_PHYS_TO_CACHED( MACH_UNCACHED_TO_PHYS(state->dmaBufAddr)), state->dmalen); if (nb = *((int *)ASIC_REG_SCSI_SCR(asic_base))) { /* pick up last upto6 bytes, sigh. */ /* Last byte really xferred is.. */ w = *(int *)ASIC_REG_SCSI_SDR0(asic_base); *to++ = w; if (--nb > 0) { w >>= 16; *to++ = w; } if (--nb > 0) { w = *(int *)ASIC_REG_SCSI_SDR1(asic_base); *to++ = w; } } } } #ifdef notdef /* * Called by asic_intr() for scsi dma pointer update interrupts. */ void asc_dma_intr() { asc_softc_t asc = &asc_softc[0]; u_int next_phys; asc->dma_xfer -= NBPG; if (asc->dma_xfer <= -NBPG) { volatile u_int *ssr = (volatile u_int *) ASIC_REG_CSR(asic_base); *ssr &= ~ASIC_CSR_DMAEN_SCSI; } else { asc->dma_next += NBPG; next_phys = MACH_CACHED_TO_PHYS(asc->dma_next); } *(volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base) = ASIC_DMA_ADDR(next_phys); MachEmptyWriteBuffer(); } #endif #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; 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 #endif /* NASC > 0 */