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Diffstat (limited to 'include/asm-mips/war.h')
| -rw-r--r-- | include/asm-mips/war.h | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/include/asm-mips/war.h b/include/asm-mips/war.h new file mode 100644 index 00000000000..c4a70412134 --- /dev/null +++ b/include/asm-mips/war.h @@ -0,0 +1,224 @@ +/* + * 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 */ |