/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
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*/
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#include <asm/types.h>
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#include <asm/sn/shub_mmr.h>
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#define DEADLOCKBIT SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_SHFT
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#define WRITECOUNTMASK SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK
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#define ALIAS_OFFSET 8
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.global sn2_ptc_deadlock_recovery_core
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.proc sn2_ptc_deadlock_recovery_core
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sn2_ptc_deadlock_recovery_core:
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.regstk 6,0,0,0
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ptc0 = in0
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data0 = in1
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ptc1 = in2
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data1 = in3
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piowc = in4
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zeroval = in5
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piowcphy = r30
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psrsave = r2
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scr1 = r16
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scr2 = r17
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mask = r18
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extr.u piowcphy=piowc,0,61;; // Convert piowc to uncached physical address
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dep piowcphy=-1,piowcphy,63,1
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movl mask=WRITECOUNTMASK
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mov r8=r0
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1:
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cmp.ne p8,p9=r0,ptc1 // Test for shub type (ptc1 non-null on shub1)
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// p8 = 1 if shub1, p9 = 1 if shub2
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add scr2=ALIAS_OFFSET,piowc // Address of WRITE_STATUS alias register
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mov scr1=7;; // Clear DEADLOCK, WRITE_ERROR, MULTI_WRITE_ERROR
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(p8) st8.rel [scr2]=scr1;;
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(p9) ld8.acq scr1=[scr2];;
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5: ld8.acq scr1=[piowc];; // Wait for PIOs to complete.
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hint @pause
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and scr2=scr1,mask;; // mask of writecount bits
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cmp.ne p6,p0=zeroval,scr2
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(p6) br.cond.sptk 5b
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////////////// BEGIN PHYSICAL MODE ////////////////////
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mov psrsave=psr // Disable IC (no PMIs)
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rsm psr.i | psr.dt | psr.ic;;
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srlz.i;;
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st8.rel [ptc0]=data0 // Write PTC0 & wait for completion.
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5: ld8.acq scr1=[piowcphy];; // Wait for PIOs to complete.
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hint @pause
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and scr2=scr1,mask;; // mask of writecount bits
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cmp.ne p6,p0=zeroval,scr2
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(p6) br.cond.sptk 5b;;
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tbit.nz p8,p7=scr1,DEADLOCKBIT;;// Test for DEADLOCK
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(p7) cmp.ne p7,p0=r0,ptc1;; // Test for non-null ptc1
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(p7) st8.rel [ptc1]=data1;; // Now write PTC1.
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5: ld8.acq scr1=[piowcphy];; // Wait for PIOs to complete.
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hint @pause
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and scr2=scr1,mask;; // mask of writecount bits
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cmp.ne p6,p0=zeroval,scr2
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(p6) br.cond.sptk 5b
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tbit.nz p8,p0=scr1,DEADLOCKBIT;;// Test for DEADLOCK
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mov psr.l=psrsave;; // Reenable IC
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srlz.i;;
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////////////// END PHYSICAL MODE ////////////////////
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(p8) add r8=1,r8
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(p8) br.cond.spnt 1b;; // Repeat if DEADLOCK occurred.
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br.ret.sptk rp
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.endp sn2_ptc_deadlock_recovery_core
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