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authorGraf Yang <graf.yang@analog.com>2009-05-07 04:09:15 +0000
committerMike Frysinger <vapier@gentoo.org>2009-06-12 06:11:41 -0400
commit5ba766752d14a741aa2d7a3c321917a310b34afb (patch)
treea97d8174cded42843de44b08d613c350b28a2729 /arch/blackfin
parenta261eec0009b6093727fb7a59b12a10c6c981714 (diff)
downloadlinux-2.6.34-ux500-5ba766752d14a741aa2d7a3c321917a310b34afb.tar.gz
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>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/Kconfig24
-rw-r--r--arch/blackfin/include/asm/cplb.h35
-rw-r--r--arch/blackfin/mach-common/arch_checks.c7
3 files changed, 43 insertions, 23 deletions
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index c04e7a4836f..f1a7969b46c 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -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)"
diff --git a/arch/blackfin/include/asm/cplb.h b/arch/blackfin/include/asm/cplb.h
index ad566ff9ad1..a75a6a9f094 100644
--- a/arch/blackfin/include/asm/cplb.h
+++ b/arch/blackfin/include/asm/cplb.h
@@ -53,29 +53,32 @@
#define SDRAM_DGENERIC (CPLB_L1_CHBL | CPLB_WT | CPLB_L1_AOW | CPLB_COMMON)
#endif
+#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 | CPLB_LOCK)
-#define L2_DMEMORY (CPLB_COMMON | CPLB_LOCK)
+#define L2_ATTR (INITIAL_T | I_CPLB | D_CPLB)
+#define L2_IMEMORY (CPLB_COMMON)
+#define L2_DMEMORY (CPLB_LOCK | CPLB_COMMON)
#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)
+#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 SDRAM_DNON_CHBL (CPLB_COMMON)
-#define SDRAM_EBIU (CPLB_COMMON)
-#define SDRAM_OOPS (CPLB_VALID | ANOMALY_05000158_WORKAROUND | CPLB_LOCK | CPLB_DIRTY)
-
#define SIZE_1K 0x00000400 /* 1K */
#define SIZE_4K 0x00001000 /* 4K */
#define SIZE_1M 0x00100000 /* 1M */
diff --git a/arch/blackfin/mach-common/arch_checks.c b/arch/blackfin/mach-common/arch_checks.c
index 80d39b2f9db..da93d920716 100644
--- a/arch/blackfin/mach-common/arch_checks.c
+++ b/arch/blackfin/mach-common/arch_checks.c
@@ -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