[U-Boot] [PATCH v2] ppc4xx: Changed 460EX/GT OCM TLB and internal SRAM initialization

[Dave Mitchell <dmitch71@gmail.com>]

Expanded OCM TLB to allow access to 64K OCM as well as 256K of
internal SRAM.

Adjusted internal SRAM initialization to match updated user
manual recommendation.

OCM & ISRAM are now mapped as follows:
        physical        virtual         size
ISRAM   0x4_0000_0000   0xE300_0000     256k
OCM     0x4_0004_0000   0xE304_0000     64k

A single TLB was used for this mapping.

Signed-off-by: Dave Mitchell <dmitch71@gmail.com>
---
 board/amcc/canyonlands/init.S |    2 +-
 cpu/ppc4xx/start.S            |   27 ++++++++++++++++++++-------
 include/configs/canyonlands.h |    2 +-
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/board/amcc/canyonlands/init.S b/board/amcc/canyonlands/init.S
index 12dead3..b7ea59c 100644
--- a/board/amcc/canyonlands/init.S
+++ b/board/amcc/canyonlands/init.S
@@ -89,7 +89,7 @@ tlbtab:
 #endif
 
 	/* TLB-entry for OCM */
-	tlbentry(CFG_OCM_BASE, SZ_16K, 0x00040000, 4, AC_R|AC_W|AC_X|SA_I)
+	tlbentry(CFG_OCM_BASE, SZ_1M, 0x00000000, 4, AC_R|AC_W|AC_X|SA_I)
 
 	/* TLB-entry for Local Configuration registers => peripherals */
 	tlbentry(CFG_LOCAL_CONF_REGS, SZ_16M, CFG_LOCAL_CONF_REGS, 4, AC_R|AC_W|AC_X|SA_G|SA_I)
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index a22520e..4d282f1 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -678,9 +678,12 @@ _start:
 	/* not all PPC's have internal SRAM usable as L2-cache */
 #if defined(CONFIG_440GX) || \
     defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
-    defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
     defined(CONFIG_460SX)
 	mtdcr	L2_CACHE_CFG,r0		/* Ensure L2 Cache is off */
+#elif defined(CONFIG_460EX) || defined(CONFIG_460GT)
+	lis	r1, 0x0000
+	ori	r1,r1,0x0008		/* Set L2_CACHE_CFG[RDBW]=1 */
+	mtdcr	L2_CACHE_CFG,r1
 #endif
 
 	lis	r2,0x7fff
@@ -705,8 +708,8 @@ _start:
 	lis	r1, 0x8003
 	ori	r1,r1, 0x0980		/* fourth 64k */
 	mtdcr	ISRAM0_SB3CR,r1
-#elif defined(CONFIG_440SPE)
-	lis	r1,0x0000		/* BAS = 0000_0000 */
+#elif defined(CONFIG_440SPE) || defined(CONFIG_460EX) || defined(CONFIG_460GT)
+	lis	r1,0x0000		/* BAS = X_0000_0000 */
 	ori	r1,r1,0x0984		/* first 64k */
 	mtdcr	ISRAM0_SB0CR,r1
 	lis	r1,0x0001
@@ -718,10 +721,20 @@ _start:
 	lis	r1, 0x0003
 	ori	r1,r1, 0x0984		/* fourth 64k */
 	mtdcr	ISRAM0_SB3CR,r1
-#elif defined(CONFIG_460EX) || defined(CONFIG_460GT)
-	lis	r1,0x4000		/* BAS = 8000_0000 */
-	ori	r1,r1,0x4580		/* 16k */
-	mtdcr	ISRAM0_SB0CR,r1
+#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
+	lis	r2,0x7fff
+	ori	r2,r2,0xffff
+	mfdcr	r1,ISRAM1_DPC
+	and	r1,r1,r2		/* Disable parity check */
+	mtdcr	ISRAM1_DPC,r1	
+	mfdcr	r1,ISRAM1_PMEG
+	and	r1,r1,r2		/* Disable pwr mgmt */
+	mtdcr	ISRAM1_PMEG,r1
+
+	lis	r1,0x0004		/* BAS = 4_0004_0000 */
+	ori	r1,r1,0x0984		/* 64k */
+	mtdcr	ISRAM1_SB0CR,r1
+#endif
 #elif defined(CONFIG_460SX)
 	lis     r1,0x0000               /* BAS = 0000_0000 */
 	ori     r1,r1,0x0B84            /* first 128k */
diff --git a/include/configs/canyonlands.h b/include/configs/canyonlands.h
index 5ab678a..d57e1b7 100644
--- a/include/configs/canyonlands.h
+++ b/include/configs/canyonlands.h
@@ -102,7 +102,7 @@
 #define CFG_FLASH_BASE_PHYS	(((u64)CFG_FLASH_BASE_PHYS_H << 32) | \
 				 (u64)CFG_FLASH_BASE_PHYS_L)
 
-#define CFG_OCM_BASE		0xE3000000	/* OCM: 16k		*/
+#define CFG_OCM_BASE		0xE3000000	/* OCM: 64k */
 #define CFG_SRAM_BASE		0xE8000000	/* SRAM: 256k		*/
 #define CFG_LOCAL_CONF_REGS	0xEF000000
 
-- 
1.6.0.4