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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-mips/war.h
downloadlinux-stericsson-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2002, 2004 by Ralf Baechle
+ */
+#ifndef _ASM_WAR_H
+#define _ASM_WAR_H
+
+#include <linux/config.h>
+
+/*
+ * Another R4600 erratum. Due to the lack of errata information the exact
+ * technical details aren't known. I've experimentally found that disabling
+ * interrupts during indexed I-cache flushes seems to be sufficient to deal
+ * with the issue.
+ *
+ * #define R4600_V1_INDEX_ICACHEOP_WAR 1
+ */
+
+/*
+ * Pleasures of the R4600 V1.x. Cite from the IDT R4600 V1.7 errata:
+ *
+ * 18. The CACHE instructions Hit_Writeback_Invalidate_D, Hit_Writeback_D,
+ * Hit_Invalidate_D and Create_Dirty_Excl_D should only be
+ * executed if there is no other dcache activity. If the dcache is
+ * accessed for another instruction immeidately preceding when these
+ * cache instructions are executing, it is possible that the dcache
+ * tag match outputs used by these cache instructions will be
+ * incorrect. These cache instructions should be preceded by at least
+ * four instructions that are not any kind of load or store
+ * instruction.
+ *
+ * This is not allowed: lw
+ * nop
+ * nop
+ * nop
+ * cache Hit_Writeback_Invalidate_D
+ *
+ * This is allowed: lw
+ * nop
+ * nop
+ * nop
+ * nop
+ * cache Hit_Writeback_Invalidate_D
+ *
+ * #define R4600_V1_HIT_CACHEOP_WAR 1
+ */
+
+
+/*
+ * Writeback and invalidate the primary cache dcache before DMA.
+ *
+ * R4600 v2.0 bug: "The CACHE instructions Hit_Writeback_Inv_D,
+ * Hit_Writeback_D, Hit_Invalidate_D and Create_Dirty_Exclusive_D will only
+ * operate correctly if the internal data cache refill buffer is empty. These
+ * CACHE instructions should be separated from any potential data cache miss
+ * by a load instruction to an uncached address to empty the response buffer."
+ * (Revision 2.0 device errata from IDT available on http://www.idt.com/
+ * in .pdf format.)
+ *
+ * #define R4600_V2_HIT_CACHEOP_WAR 1
+ */
+
+/*
+ * R4600 CPU modules for the Indy come with both V1.7 and V2.0 processors.
+ */
+#ifdef CONFIG_SGI_IP22
+
+#define R4600_V1_INDEX_ICACHEOP_WAR 1
+#define R4600_V1_HIT_CACHEOP_WAR 1
+#define R4600_V2_HIT_CACHEOP_WAR 1
+
+#endif
+
+/*
+ * But the RM200C seems to have been shipped only with V2.0 R4600s
+ */
+#ifdef CONFIG_SNI_RM200_PCI
+
+#define R4600_V2_HIT_CACHEOP_WAR 1
+
+#endif
+
+#ifdef CONFIG_CPU_R5432
+
+/*
+ * When an interrupt happens on a CP0 register read instruction, CPU may
+ * lock up or read corrupted values of CP0 registers after it enters
+ * the exception handler.
+ *
+ * This workaround makes sure that we read a "safe" CP0 register as the
+ * first thing in the exception handler, which breaks one of the
+ * pre-conditions for this problem.
+ */
+#define R5432_CP0_INTERRUPT_WAR 1
+
+#endif
+
+#if defined(CONFIG_SB1_PASS_1_WORKAROUNDS) || \
+ defined(CONFIG_SB1_PASS_2_WORKAROUNDS)
+
+/*
+ * Workaround for the Sibyte M3 errata the text of which can be found at
+ *
+ * http://sibyte.broadcom.com/hw/bcm1250/docs/pass2errata.txt
+ *
+ * This will enable the use of a special TLB refill handler which does a
+ * consistency check on the information in c0_badvaddr and c0_entryhi and
+ * will just return and take the exception again if the information was
+ * found to be inconsistent.
+ */
+#define BCM1250_M3_WAR 1
+
+/*
+ * This is a DUART workaround related to glitches around register accesses
+ */
+#define SIBYTE_1956_WAR 1
+
+#endif
+
+/*
+ * Fill buffers not flushed on CACHE instructions
+ *
+ * Hit_Invalidate_I cacheops invalidate an icache line but the refill
+ * for that line can get stale data from the fill buffer instead of
+ * accessing memory if the previous icache miss was also to that line.
+ *
+ * Workaround: generate an icache refill from a different line
+ *
+ * Affects:
+ * MIPS 4K RTL revision <3.0, PRID revision <4
+ */
+#if defined(CONFIG_MIPS_MALTA) || defined(CONFIG_MIPS_ATLAS) || \
+ defined(CONFIG_MIPS_SEAD)
+#define MIPS4K_ICACHE_REFILL_WAR 1
+#endif
+
+/*
+ * Missing implicit forced flush of evictions caused by CACHE
+ * instruction
+ *
+ * Evictions caused by a CACHE instructions are not forced on to the
+ * bus. The BIU gives higher priority to fetches than to the data from
+ * the eviction buffer and no collision detection is performed between
+ * fetches and pending data from the eviction buffer.
+ *
+ * Workaround: Execute a SYNC instruction after the cache instruction
+ *
+ * Affects:
+ * MIPS 5Kc,5Kf RTL revision <2.3, PRID revision <8
+ * MIPS 20Kc RTL revision <4.0, PRID revision <?
+ */
+#if defined(CONFIG_MIPS_MALTA) || defined(CONFIG_MIPS_ATLAS) || \
+ defined(CONFIG_MIPS_SEAD)
+#define MIPS_CACHE_SYNC_WAR 1
+#endif
+
+/*
+ * From TX49/H2 manual: "If the instruction (i.e. CACHE) is issued for
+ * the line which this instruction itself exists, the following
+ * operation is not guaranteed."
+ *
+ * Workaround: do two phase flushing for Index_Invalidate_I
+ */
+#ifdef CONFIG_CPU_TX49XX
+#define TX49XX_ICACHE_INDEX_INV_WAR 1
+#endif
+
+/*
+ * On the RM9000 there is a problem which makes the CreateDirtyExclusive
+ * cache operation unusable on SMP systems.
+ */
+#if defined(CONFIG_MOMENCO_JAGUAR_ATX) || defined(CONFIG_PMC_YOSEMITE)
+#define RM9000_CDEX_SMP_WAR 1
+#endif
+
+/*
+ * ON the R10000 upto version 2.6 (not sure about 2.7) there is a bug that
+ * may cause ll / sc and lld / scd sequences to execute non-atomically.
+ */
+#ifdef CONFIG_SGI_IP27
+#define R10000_LLSC_WAR 1
+#endif
+
+/*
+ * Workarounds default to off
+ */
+#ifndef R4600_V1_INDEX_ICACHEOP_WAR
+#define R4600_V1_INDEX_ICACHEOP_WAR 0
+#endif
+#ifndef R4600_V1_HIT_CACHEOP_WAR
+#define R4600_V1_HIT_CACHEOP_WAR 0
+#endif
+#ifndef R4600_V2_HIT_CACHEOP_WAR
+#define R4600_V2_HIT_CACHEOP_WAR 0
+#endif
+#ifndef R5432_CP0_INTERRUPT_WAR
+#define R5432_CP0_INTERRUPT_WAR 0
+#endif
+#ifndef BCM1250_M3_WAR
+#define BCM1250_M3_WAR 0
+#endif
+#ifndef SIBYTE_1956_WAR
+#define SIBYTE_1956_WAR 0
+#endif
+#ifndef MIPS4K_ICACHE_REFILL_WAR
+#define MIPS4K_ICACHE_REFILL_WAR 0
+#endif
+#ifndef MIPS_CACHE_SYNC_WAR
+#define MIPS_CACHE_SYNC_WAR 0
+#endif
+#ifndef TX49XX_ICACHE_INDEX_INV_WAR
+#define TX49XX_ICACHE_INDEX_INV_WAR 0
+#endif
+#ifndef RM9000_CDEX_SMP_WAR
+#define RM9000_CDEX_SMP_WAR 0
+#endif
+#ifndef R10000_LLSC_WAR
+#define R10000_LLSC_WAR 0
+#endif
+
+#endif /* _ASM_WAR_H */