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Blackfin: work around anomaly 05000220 

When possible, work around anomaly 05000220 (external memory is write
back cached, but L2 is not cached).  If not possible, detect the
conditions at build time and reject any qualifying configurations.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Graf Yang 2009-05-07 04:09:15 +00:00 committed by Mike Frysinger
parent a261eec000
commit 5ba766752d
3 changed files with 46 additions and 26 deletions
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24
arch/blackfin/Kconfig
View File

@ -913,7 +913,7 @@ config BFIN_ICACHE_LOCK
bool "Enable Instruction Cache Locking"
choice
prompt "Policy"
prompt "External memory cache policy"
depends on BFIN_DCACHE
default BFIN_WB if !SMP
default BFIN_WT if SMP
@ -954,12 +954,22 @@ config BFIN_WT
endchoice
config BFIN_L2_CACHEABLE
bool "Cache L2 SRAM"
depends on (BFIN_DCACHE || BFIN_ICACHE) && (BF54x || (BF561 && !SMP))
default n
help
Select to make L2 SRAM cacheable in L1 data and instruction cache.
choice
prompt "L2 SRAM cache policy"
depends on (BF54x || BF561)
default BFIN_L2_WT
config BFIN_L2_WB
bool "Write back"
depends on !SMP
config BFIN_L2_WT
bool "Write through"
depends on !SMP
config BFIN_L2_NOT_CACHED
bool "Not cached"
endchoice
config MPU
bool "Enable the memory protection unit (EXPERIMENTAL)"

41
arch/blackfin/include/asm/cplb.h
View File

@ -53,29 +53,32 @@
#define SDRAM_DGENERIC (CPLB_L1_CHBL | CPLB_WT | CPLB_L1_AOW | CPLB_COMMON)
#endif
#define L1_DMEMORY (CPLB_LOCK | CPLB_COMMON)
#ifdef CONFIG_SMP
#define L2_ATTR (INITIAL_T | I_CPLB | D_CPLB)
#define L2_IMEMORY (CPLB_COMMON | CPLB_LOCK)
#define L2_DMEMORY (CPLB_COMMON | CPLB_LOCK)
#else
#ifdef CONFIG_BFIN_L2_CACHEABLE
#define L2_IMEMORY (SDRAM_IGENERIC)
#define L2_DMEMORY (SDRAM_DGENERIC)
#else
#define L2_IMEMORY (CPLB_COMMON)
#define L2_DMEMORY (CPLB_COMMON)
#endif /* CONFIG_BFIN_L2_CACHEABLE */
#define L2_ATTR (INITIAL_T | SWITCH_T | I_CPLB | D_CPLB)
#endif /* CONFIG_SMP */
#define SDRAM_DNON_CHBL (CPLB_COMMON)
#define SDRAM_EBIU (CPLB_COMMON)
#define SDRAM_OOPS (CPLB_VALID | ANOMALY_05000158_WORKAROUND | CPLB_LOCK | CPLB_DIRTY)
#define L1_DMEMORY (CPLB_LOCK | CPLB_COMMON)
#ifdef CONFIG_SMP
#define L2_ATTR (INITIAL_T | I_CPLB | D_CPLB)
#define L2_IMEMORY (CPLB_COMMON)
#define L2_DMEMORY (CPLB_LOCK | CPLB_COMMON)
#else
#define L2_ATTR (INITIAL_T | SWITCH_T | I_CPLB | D_CPLB)
#define L2_IMEMORY (SDRAM_IGENERIC)
# if defined(CONFIG_BFIN_L2_WB)
# define L2_DMEMORY (CPLB_L1_CHBL | CPLB_COMMON)
# elif defined(CONFIG_BFIN_L2_WT)
# define L2_DMEMORY (CPLB_L1_CHBL | CPLB_WT | CPLB_L1_AOW | CPLB_COMMON)
# elif defined(CONFIG_BFIN_L2_NOT_CACHED)
# define L2_DMEMORY (CPLB_COMMON)
# else
# define L2_DMEMORY (0)
# endif
#endif /* CONFIG_SMP */
#define SIZE_1K 0x00000400 /* 1K */
#define SIZE_4K 0x00001000 /* 4K */
#define SIZE_1M 0x00100000 /* 1M */

7
arch/blackfin/mach-common/arch_checks.c
View File

@ -71,3 +71,10 @@
#if ANOMALY_05000448
# error You are using a part with anomaly 05000448, this issue causes random memory read/write failures - that means random crashes.
#endif
/* if 220 exists, can not set External Memory WB and L2 not_cached, either External Memory not_cached and L2 WB */
#if ANOMALY_05000220 && \
((defined(CONFIG_BFIN_WB) && defined(CONFIG_BFIN_L2_NOT_CACHED)) || \
(!defined(CONFIG_BFIN_DCACHE) && defined(CONFIG_BFIN_L2_WB)))
# error You are exposing Anomaly 220 in this config, either config L2 as Write Through, or make External Memory WB.
#endif