aic79xx.seq

一个2.4.21版本的嵌入式linux内核

/*
 * Adaptec U320 device driver firmware for Linux and FreeBSD.
 *
 * Copyright (c) 1994-2001 Justin T. Gibbs.
 * Copyright (c) 2000-2002 Adaptec Inc.
 * All rights reserved.
 *
 * 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,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 *
 * $FreeBSD$
 */

VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic79xx.seq#78 $"
PATCH_ARG_LIST = "struct ahd_softc *ahd"
PREFIX = "ahd_"

#include "aic79xx.reg"
#include "scsi_message.h"

restart:
if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
	test	SEQINTCODE, 0xFF jz idle_loop;
	SET_SEQINTCODE(NO_SEQINT)
}

idle_loop:

	if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
		/*
		 * Convert ERROR status into a sequencer
		 * interrupt to handle the case of an
		 * interrupt collision on the hardware
		 * setting of HWERR.
		 */
		test	ERROR, 0xFF jz no_error_set;
		SET_SEQINTCODE(SAW_HWERR)
no_error_set:
	}
	SET_MODE(M_SCSI, M_SCSI)
	test	SCSISEQ0, ENSELO|ENARBO jnz idle_loop_checkbus;
	test	SEQ_FLAGS2, SELECTOUT_QFROZEN jnz idle_loop_checkbus;
	cmp	WAITING_TID_HEAD[1], SCB_LIST_NULL je idle_loop_checkbus;
	/*
	 * ENSELO is cleared by a SELDO, so we must test for SELDO
	 * one last time.
	 */
BEGIN_CRITICAL;
	test	SSTAT0, SELDO jnz select_out;
END_CRITICAL;
	call	start_selection;
idle_loop_checkbus:
BEGIN_CRITICAL;
	test	SSTAT0, SELDO jnz select_out;
END_CRITICAL;
	test	SSTAT0, SELDI jnz select_in;
	test	SCSIPHASE, ~DATA_PHASE_MASK jz idle_loop_check_nonpackreq;
	test	SCSISIGO, ATNO jz idle_loop_check_nonpackreq;
	call	unexpected_nonpkt_phase_find_ctxt;
idle_loop_check_nonpackreq:
	test	SSTAT2, NONPACKREQ jz . + 2;
	call	unexpected_nonpkt_phase_find_ctxt;
	call	idle_loop_gsfifo_in_scsi_mode;
	call	idle_loop_service_fifos;
	call	idle_loop_cchan;
	jmp	idle_loop;

BEGIN_CRITICAL;
idle_loop_gsfifo:
	SET_MODE(M_SCSI, M_SCSI)
idle_loop_gsfifo_in_scsi_mode:
	test	LQISTAT2, LQIGSAVAIL jz return;
	/*
	 * We have received good status for this transaction.  There may
	 * still be data in our FIFOs draining to the host.  Setup
	 * monitoring of the draining process or complete the SCB.
	 */
good_status_IU_done:
	bmov	SCBPTR, GSFIFO, 2;
	clr	SCB_SCSI_STATUS;
	/*
	 * If a command completed before an attempted task management
	 * function completed, notify the host after disabling any
	 * pending select-outs.
	 */
	test	SCB_TASK_MANAGEMENT, 0xFF jz gsfifo_complete_normally;
	test	SSTAT0, SELDO|SELINGO jnz . + 2;
	and	SCSISEQ0, ~ENSELO;
	SET_SEQINTCODE(TASKMGMT_CMD_CMPLT_OKAY)
gsfifo_complete_normally:
	or	SCB_CONTROL, STATUS_RCVD;

	/*
	 * Since this status did not consume a FIFO, we have to
	 * be a bit more dilligent in how we check for FIFOs pertaining
	 * to this transaction.  There are three states that a FIFO still
	 * transferring data may be in.
	 *
	 * 1) Configured and draining to the host, with a pending CLRCHN.
	 * 2) Configured and draining to the host, no pending CLRCHN.
	 * 3) Pending cfg4data, fifo not empty.
	 *
	 * Cases 1 and 2 can be detected by noticing that a longjmp is
	 * active for the FIFO and LONGJMP_SCB matches our SCB.  In this
	 * case, we allow the routine servicing the FIFO to complete the SCB.
	 * 
	 * Case 3 implies either a pending or yet to occur save data
	 * pointers for this same context in the other FIFO.  So, if
	 * we detect case 2, we will properly defer the post of the SCB
	 * and achieve the desired result.  The pending cfg4data will
	 * notice that status has been received and complete the SCB.
	 */
	test	SCB_SGPTR, SG_LIST_NULL jz good_status_check_fifos;
	/*
	 * All segments have been loaded (or no data transfer), so
	 * it is safe to complete the command.  Since this was a
	 * cheap command to check for completion, loop to see if
	 * more entries can be removed from the GSFIFO.
	 */
	call	complete;
END_CRITICAL;
	jmp	idle_loop_gsfifo_in_scsi_mode;
BEGIN_CRITICAL;
good_status_check_fifos:
	clc;
	bmov	ARG_1, SCBPTR, 2;
	SET_MODE(M_DFF0, M_DFF0)
	call	check_fifo;
	jc	return;
	SET_MODE(M_DFF1, M_DFF1)
	call	check_fifo;
	jc	return;
	SET_MODE(M_SCSI, M_SCSI)
	jmp	queue_scb_completion;
END_CRITICAL;

idle_loop_service_fifos:
	SET_MODE(M_DFF0, M_DFF0)
	test	LONGJMP_ADDR[1], INVALID_ADDR jnz idle_loop_next_fifo;
	call	longjmp;
idle_loop_next_fifo:
	SET_MODE(M_DFF1, M_DFF1)
	test	LONGJMP_ADDR[1], INVALID_ADDR jz longjmp;
	ret;

idle_loop_cchan:
	SET_MODE(M_CCHAN, M_CCHAN)
	test	QOFF_CTLSTA, HS_MAILBOX_ACT jz	hs_mailbox_empty;
	mov	LOCAL_HS_MAILBOX, HS_MAILBOX;
	or	QOFF_CTLSTA, HS_MAILBOX_ACT;
hs_mailbox_empty:
BEGIN_CRITICAL;
	test	CCSCBCTL, CCARREN|CCSCBEN jz scbdma_idle;
	test	CCSCBCTL, CCSCBDIR jnz fetch_new_scb_inprog;
	test	CCSCBCTL, CCSCBDONE jz return;
END_CRITICAL;
	/* FALLTHROUGH */
scbdma_tohost_done:
	test	CCSCBCTL, CCARREN jz fill_qoutfifo_dmadone;
	/*
	 * A complete SCB upload requires no intervention.
	 * The SCB is already on the COMPLETE_SCB list
	 * and its completion notification will now be
	 * handled just like any other SCB.
	 */
	and	CCSCBCTL, ~(CCARREN|CCSCBEN) ret;
fill_qoutfifo_dmadone:
	and	CCSCBCTL, ~(CCARREN|CCSCBEN);
	call	qoutfifo_updated;
	mvi	COMPLETE_SCB_DMAINPROG_HEAD[1], SCB_LIST_NULL;
	bmov	QOUTFIFO_NEXT_ADDR, SCBHADDR, 4;
	test	QOFF_CTLSTA, SDSCB_ROLLOVR jz return;
	bmov	QOUTFIFO_NEXT_ADDR, SHARED_DATA_ADDR, 4;
	xor	QOUTFIFO_ENTRY_VALID_TAG, QOUTFIFO_ENTRY_VALID_TOGGLE ret;

qoutfifo_updated:
	/*
	 * If there are more commands waiting to be dma'ed
	 * to the host, always coaless.  Otherwise honor the
	 * host's wishes.
	 */
	cmp	COMPLETE_DMA_SCB_HEAD[1], SCB_LIST_NULL jne coaless_by_count;
	cmp	COMPLETE_SCB_HEAD[1], SCB_LIST_NULL jne coaless_by_count;
	test	LOCAL_HS_MAILBOX, ENINT_COALESS jz issue_cmdcmplt;

	/*
	 * If we have relatively few commands outstanding, don't
	 * bother waiting for another command to complete.
	 */
	test	CMDS_PENDING[1], 0xFF jnz coaless_by_count;
	/* Add -1 so that jnc means <= not just < */
	add	A, -1, INT_COALESSING_MINCMDS;
	add	NONE, A, CMDS_PENDING;
	jnc	issue_cmdcmplt;
	
	/*
	 * If coalessing, only coaless up to the limit
	 * provided by the host driver.
	 */
coaless_by_count:
	mov	A, INT_COALESSING_MAXCMDS;
	add	NONE, A, INT_COALESSING_CMDCOUNT;
	jc	issue_cmdcmplt;
	/*
	 * If the timer is not currently active,
	 * fire it up.
	 */
	test	INTCTL, SWTMINTMASK jz return;
	bmov	SWTIMER, INT_COALESSING_TIMER, 2;
	mvi	CLRSEQINTSTAT, CLRSEQ_SWTMRTO;
	or	INTCTL, SWTMINTEN|SWTIMER_START;
	and	INTCTL, ~SWTMINTMASK ret;

issue_cmdcmplt:
	mvi	INTSTAT, CMDCMPLT;
	clr	INT_COALESSING_CMDCOUNT;
	or	INTCTL, SWTMINTMASK ret;

BEGIN_CRITICAL;
fetch_new_scb_inprog:
	test	CCSCBCTL, ARRDONE jz return;
fetch_new_scb_done:
	and	CCSCBCTL, ~(CCARREN|CCSCBEN);
	bmov	REG0, SCBPTR, 2;
	clr	A;
	add	CMDS_PENDING, 1;
	adc	CMDS_PENDING[1], A;
	/* Update the next SCB address to download. */
	bmov	NEXT_QUEUED_SCB_ADDR, SCB_NEXT_SCB_BUSADDR, 4;
	mvi	SCB_NEXT[1], SCB_LIST_NULL;
	mvi	SCB_NEXT2[1], SCB_LIST_NULL;
	/* Increment our position in the QINFIFO. */
	mov	NONE, SNSCB_QOFF;
	/*
	 * SCBs that want to send messages are always
	 * queued independently.  This ensures that they
	 * are at the head of the SCB list to select out
	 * to a target and we will see the MK_MESSAGE flag.
	 */
	test	SCB_CONTROL, MK_MESSAGE jnz first_new_target_scb;
	shr	SINDEX, 3, SCB_SCSIID;
	and	SINDEX, ~0x1;
	mvi	SINDEX[1], (WAITING_SCB_TAILS >> 8);
	bmov	DINDEX, SINDEX, 2;
	bmov	SCBPTR, SINDIR, 2;
	bmov	DINDIR, REG0, 2;
	cmp	SCBPTR[1], SCB_LIST_NULL je first_new_target_scb;
	bmov	SCB_NEXT, REG0, 2 ret;
first_new_target_scb:
	cmp	WAITING_TID_HEAD[1], SCB_LIST_NULL je first_new_scb;
	bmov	SCBPTR, WAITING_TID_TAIL, 2;
	bmov	SCB_NEXT2, REG0, 2;
	bmov	WAITING_TID_TAIL, REG0, 2 ret;
first_new_scb:
	bmov	WAITING_TID_HEAD, REG0, 2;
	bmov	WAITING_TID_TAIL, REG0, 2 ret;
END_CRITICAL;

scbdma_idle:
	/*
	 * Give precedence to downloading new SCBs to execute
	 * unless select-outs are currently frozen.
	 */
	test	SEQ_FLAGS2, SELECTOUT_QFROZEN jnz . + 2;
BEGIN_CRITICAL;
	test	QOFF_CTLSTA, NEW_SCB_AVAIL jnz fetch_new_scb;
	cmp	COMPLETE_DMA_SCB_HEAD[1], SCB_LIST_NULL jne dma_complete_scb;
	cmp	COMPLETE_SCB_HEAD[1], SCB_LIST_NULL je return;
	/* FALLTHROUGH */
fill_qoutfifo:
	/*
	 * Keep track of the SCBs we are dmaing just
	 * in case the DMA fails or is aborted.
	 */
	mov	A, QOUTFIFO_ENTRY_VALID_TAG;
	bmov	COMPLETE_SCB_DMAINPROG_HEAD, COMPLETE_SCB_HEAD, 2;
	mvi	CCSCBCTL, CCSCBRESET;
	bmov	SCBHADDR, QOUTFIFO_NEXT_ADDR, 4;
	bmov	SCBPTR, COMPLETE_SCB_HEAD, 2;
fill_qoutfifo_loop:
	mov	CCSCBRAM, SCBPTR;
	or	CCSCBRAM, A, SCBPTR[1];
	mov	NONE, SDSCB_QOFF;
	inc	INT_COALESSING_CMDCOUNT;
	add	CMDS_PENDING, -1;
	adc	CMDS_PENDING[1], -1;
	cmp	SCB_NEXT_COMPLETE[1], SCB_LIST_NULL je fill_qoutfifo_done;
	cmp	CCSCBADDR, CCSCBADDR_MAX je fill_qoutfifo_done;
	test	QOFF_CTLSTA, SDSCB_ROLLOVR jnz fill_qoutfifo_done;
	bmov	SCBPTR, SCB_NEXT_COMPLETE, 2;
	jmp	fill_qoutfifo_loop;
fill_qoutfifo_done:
	mov	SCBHCNT, CCSCBADDR;
	mvi	CCSCBCTL, CCSCBEN|CCSCBRESET;
	bmov	COMPLETE_SCB_HEAD, SCB_NEXT_COMPLETE, 2;
	mvi	SCB_NEXT_COMPLETE[1], SCB_LIST_NULL ret;

fetch_new_scb:
	bmov	SCBHADDR, NEXT_QUEUED_SCB_ADDR, 4;
	mvi	CCARREN|CCSCBEN|CCSCBDIR|CCSCBRESET jmp dma_scb;
dma_complete_scb:
	bmov	SCBPTR, COMPLETE_DMA_SCB_HEAD, 2;
	bmov	SCBHADDR, SCB_BUSADDR, 4;
	mvi	CCARREN|CCSCBEN|CCSCBRESET call dma_scb;
	/*
	 * Now that we've started the DMA, push us onto
	 * the normal completion queue to have our SCBID
	 * posted to the kernel.
	 */
	bmov	COMPLETE_DMA_SCB_HEAD, SCB_NEXT_COMPLETE, 2;
	bmov	SCB_NEXT_COMPLETE, COMPLETE_SCB_HEAD, 2;
	bmov	COMPLETE_SCB_HEAD, SCBPTR, 2 ret;
END_CRITICAL;

/*
 * Either post or fetch an SCB from host memory.  The caller
 * is responsible for polling for transfer completion.
 *
 * Prerequisits: Mode == M_CCHAN
 *		 SINDEX contains CCSCBCTL flags
 *		 SCBHADDR set to Host SCB address
 *		 SCBPTR set to SCB src location on "push" operations
 */
SET_SRC_MODE	M_CCHAN;
SET_DST_MODE	M_CCHAN;
dma_scb:
	mvi	SCBHCNT, SCB_TRANSFER_SIZE;
	mov	CCSCBCTL, SINDEX ret;

BEGIN_CRITICAL;
setjmp_setscb:
	bmov	LONGJMP_SCB, SCBPTR, 2;
setjmp:
	bmov	LONGJMP_ADDR, STACK, 2 ret;
setjmp_inline:
	bmov	LONGJMP_ADDR, STACK, 2;
longjmp:
	bmov	STACK, LONGJMP_ADDR, 2 ret;
END_CRITICAL;

/*************************** Chip Bug Work Arounds ****************************/
/*
 * Must disable interrupts when setting the mode pointer
 * register as an interrupt occurring mid update will
 * fail to store the new mode value for restoration on
 * an iret.
 */
if ((ahd->bugs & AHD_SET_MODE_BUG) != 0) {
set_mode_work_around:
	mvi	SEQINTCTL, INTVEC1DSL;
	mov	MODE_PTR, SINDEX;
	clr	SEQINTCTL ret;

toggle_dff_mode_work_around:
	mvi	SEQINTCTL, INTVEC1DSL;
	xor	MODE_PTR, MK_MODE(M_DFF1, M_DFF1);
	clr	SEQINTCTL ret;
}


if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
set_seqint_work_around:
	mov	SEQINTCODE, SINDEX;
	mvi	SEQINTCODE, NO_SEQINT ret;
}

/************************ Packetized LongJmp Routines *************************/
SET_SRC_MODE	M_SCSI;
SET_DST_MODE	M_SCSI;
start_selection:
BEGIN_CRITICAL;
	if ((ahd->bugs & AHD_SENT_SCB_UPDATE_BUG) != 0) {
		/*
		 * Razor #494
		 * Rev A hardware fails to update LAST/CURR/NEXTSCB
		 * correctly after a packetized selection in several
		 * situations:
		 *
		 * 1) If only one command existed in the queue, the
		 *    LAST/CURR/NEXTSCB are unchanged.
		 *
		 * 2) In a non QAS, protocol allowed phase change,
		 *    the queue is shifted 1 too far.  LASTSCB is
		 *    the last SCB that was correctly processed.
		 * 
		 * 3) In the QAS case, if the full list of commands
		 *    was successfully sent, NEXTSCB is NULL and neither
		 *    CURRSCB nor LASTSCB can be trusted.  We must
		 *    manually walk the list counting MAXCMDCNT elements
		 *    to find the last SCB that was sent correctly.
		 *
		 * To simplify the workaround for this bug in SELDO
		 * handling, we initialize LASTSCB prior to enabling
		 * selection so we can rely on it even for case #1 above.
		 */
		bmov	LASTSCB, WAITING_TID_HEAD, 2;
	}
	bmov	CURRSCB, WAITING_TID_HEAD, 2;
	bmov	SCBPTR, WAITING_TID_HEAD, 2;
	shr	SELOID, 4, SCB_SCSIID;
	/*
	 * If we want to send a message to the device, ensure
	 * we are selecting with atn irregardless of our packetized
	 * agreement.  Since SPI4 only allows target reset or PPR
	 * messages if this is a packetized connection, the change
	 * to our negotiation table entry for this selection will
	 * be cleared when the message is acted on.
	 */
	test	SCB_CONTROL, MK_MESSAGE jz . + 3;
	mov	NEGOADDR, SELOID;
	or	NEGCONOPTS, ENAUTOATNO;
	or	SCSISEQ0, ENSELO ret;
END_CRITICAL;

/*
 * Allocate a FIFO for a non-packetized transaction.
 * In RevA hardware, both FIFOs must be free before we
 * can allocate a FIFO for a non-packetized transaction.
 */
allocate_fifo_loop:
	/*
	 * Do whatever work is required to free a FIFO.
	 */
	call	idle_loop_service_fifos;
	SET_MODE(M_SCSI, M_SCSI)
allocate_fifo:
	if ((ahd->bugs & AHD_NONPACKFIFO_BUG) != 0) {
		and	A, FIFO0FREE|FIFO1FREE, DFFSTAT;
		cmp	A, FIFO0FREE|FIFO1FREE jne allocate_fifo_loop;
	} else {
		test	DFFSTAT, FIFO1FREE jnz allocate_fifo1;
		test	DFFSTAT, FIFO0FREE jz allocate_fifo_loop;
		mvi	DFFSTAT, B_CURRFIFO_0;
		SET_MODE(M_DFF0, M_DFF0)
		bmov	SCBPTR, ALLOCFIFO_SCBPTR, 2 ret;
	}
SET_SRC_MODE	M_SCSI;
SET_DST_MODE	M_SCSI;
allocate_fifo1:
	mvi	DFFSTAT, CURRFIFO_1;
	SET_MODE(M_DFF1, M_DFF1)
	bmov	SCBPTR, ALLOCFIFO_SCBPTR, 2 ret;

/*