2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
10 #include <asm/sn/shub_mmr.h>
12 #define DEADLOCKBIT SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_SHFT
13 #define WRITECOUNTMASK SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK
14 #define ALIAS_OFFSET 8
17 .global sn2_ptc_deadlock_recovery_core
18 .proc sn2_ptc_deadlock_recovery_core
20 sn2_ptc_deadlock_recovery_core:
36 extr.u piowcphy=piowc,0,61;; // Convert piowc to uncached physical address
37 dep piowcphy=-1,piowcphy,63,1
38 movl mask=WRITECOUNTMASK
42 add scr2=ALIAS_OFFSET,piowc // Address of WRITE_STATUS alias register
46 5: ld8.acq scr1=[piowc];; // Wait for PIOs to complete.
48 and scr2=scr1,mask;; // mask of writecount bits
49 cmp.ne p6,p0=zeroval,scr2
54 ////////////// BEGIN PHYSICAL MODE ////////////////////
55 mov psrsave=psr // Disable IC (no PMIs)
56 rsm psr.i | psr.dt | psr.ic;;
59 st8.rel [ptc0]=data0 // Write PTC0 & wait for completion.
61 5: ld8.acq scr1=[piowcphy];; // Wait for PIOs to complete.
63 and scr2=scr1,mask;; // mask of writecount bits
64 cmp.ne p6,p0=zeroval,scr2
65 (p6) br.cond.sptk 5b;;
67 tbit.nz p8,p7=scr1,DEADLOCKBIT;;// Test for DEADLOCK
68 (p7) cmp.ne p7,p0=r0,ptc1;; // Test for non-null ptc1
70 (p7) st8.rel [ptc1]=data1;; // Now write PTC1.
72 5: ld8.acq scr1=[piowcphy];; // Wait for PIOs to complete.
74 and scr2=scr1,mask;; // mask of writecount bits
75 cmp.ne p6,p0=zeroval,scr2
78 tbit.nz p8,p0=scr1,DEADLOCKBIT;;// Test for DEADLOCK
80 mov psr.l=psrsave;; // Reenable IC
82 ////////////// END PHYSICAL MODE ////////////////////
85 (p8) br.cond.spnt 1b;; // Repeat if DEADLOCK occurred.
88 .endp sn2_ptc_deadlock_recovery_core