[PATCH] Use dynamic SDRAM TLB setup on AMCC Ebony eval board

Define CONFIG_PROG_SDRAM_TLB so that the TLB entries for the
DDR memory are dynamically programmed matching the total size
of the equipped memory (DIMM modules).

Signed-off-by: Stefan Roese <sr@denx.de>

2 files changed, 22 insertions, 60 deletions

diff --git a/board/amcc/ebony/init.S b/board/amcc/ebony/init.S
index cc8f8b444..c86076e80 100644
--- a/board/amcc/ebony/init.S
+++ b/board/amcc/ebony/init.S
@@ -22,53 +22,7 @@
 
 #include <ppc_asm.tmpl>
 #include <config.h>
-
-/* General */
-#define TLB_VALID   0x00000200
-
-/* Supported page sizes */
-
-#define SZ_1K	    0x00000000
-#define SZ_4K	    0x00000010
-#define SZ_16K	    0x00000020
-#define SZ_64K	    0x00000030
-#define SZ_256K	    0x00000040
-#define SZ_1M	    0x00000050
-#define SZ_16M	    0x00000070
-#define SZ_256M	    0x00000090
-
-/* Storage attributes */
-#define SA_W	    0x00000800	    /* Write-through */
-#define SA_I	    0x00000400	    /* Caching inhibited */
-#define SA_M	    0x00000200	    /* Memory coherence */
-#define SA_G	    0x00000100	    /* Guarded */
-#define SA_E	    0x00000080	    /* Endian */
-
-/* Access control */
-#define AC_X	    0x00000024	    /* Execute */
-#define AC_W	    0x00000012	    /* Write */
-#define AC_R	    0x00000009	    /* Read */
-
-/* Some handy macros */
-
-#define EPN(e)		((e) & 0xfffffc00)
-#define TLB0(epn,sz)	( (EPN((epn)) | (sz) | TLB_VALID ) )
-#define TLB1(rpn,erpn)	( ((rpn)&0xfffffc00) | (erpn) )
-#define TLB2(a)		( (a)&0x00000fbf )
-
-#define tlbtab_start\
-	mflr    r1  ;\
-	bl 0f	    ;
-
-#define tlbtab_end\
-	.long 0, 0, 0	;   \
-0:	mflr    r0	;   \
-	mtlr    r1	;   \
-	blr		;
-
-#define tlbentry(epn,sz,rpn,erpn,attr)\
-	.long TLB0(epn,sz),TLB1(rpn,erpn),TLB2(attr)
-
+#include <asm-ppc/mmu.h>
 
 /**************************************************************************
  * TLB TABLE
@@ -81,16 +35,23 @@
  *
  *************************************************************************/
 
-    .section .bootpg,"ax"
-    .globl tlbtab
+	.section .bootpg,"ax"
+	.globl tlbtab
 
 tlbtab:
-    tlbtab_start
-    tlbentry( 0xf0000000, SZ_256M, 0xf0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
-    tlbentry( CFG_PERIPHERAL_BASE, SZ_256M, 0x40000000, 1, AC_R|AC_W|SA_G|SA_I)
-    tlbentry( CFG_ISRAM_BASE, SZ_4K, 0x80000000, 0, AC_R|AC_W|AC_X )
-    tlbentry( CFG_ISRAM_BASE + 0x1000, SZ_4K, 0x80001000, 0, AC_R|AC_W|AC_X )
-    tlbentry( CFG_SDRAM_BASE, SZ_256M, 0x00000000, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
-    tlbentry( CFG_PCI_BASE, SZ_256M, 0x00000000, 2, AC_R|AC_W|SA_G|SA_I )
-    tlbentry( CFG_PCI_MEMBASE, SZ_256M, 0x00000000, 3, AC_R|AC_W|SA_G|SA_I )
-    tlbtab_end
+	tlbtab_start
+
+	tlbentry(0xf0000000, SZ_256M, 0xf0000000, 1, AC_R|AC_W|AC_X|SA_G|SA_I)
+
+	/*
+	 * TLB entries for SDRAM are not needed on this platform.
+	 * They are dynamically generated in the SPD DDR(2) detection
+	 * routine.
+	 */
+
+	tlbentry(CFG_PERIPHERAL_BASE, SZ_256M, 0x40000000, 1, AC_R|AC_W|SA_G|SA_I)
+	tlbentry(CFG_ISRAM_BASE, SZ_4K, 0x80000000, 0, AC_R|AC_W|AC_X)
+	tlbentry(CFG_ISRAM_BASE + 0x1000, SZ_4K, 0x80001000, 0, AC_R|AC_W|AC_X)
+	tlbentry(CFG_PCI_BASE, SZ_256M, 0x00000000, 2, AC_R|AC_W|SA_G|SA_I)
+	tlbentry(CFG_PCI_MEMBASE, SZ_256M, 0x00000000, 3, AC_R|AC_W|SA_G|SA_I)
+	tlbtab_end
diff --git a/include/configs/ebony.h b/include/configs/ebony.h
index 6c4d7cc4f..a42319b09 100644
--- a/include/configs/ebony.h
+++ b/include/configs/ebony.h
@@ -133,8 +133,9 @@
 /*-----------------------------------------------------------------------
  * DDR SDRAM
  *----------------------------------------------------------------------*/
-#define CONFIG_SPD_EEPROM               /* Use SPD EEPROM for setup     */
-#define SPD_EEPROM_ADDRESS {0x53,0x52}  /* SPD i2c spd addresses        */
+#define CONFIG_SPD_EEPROM	1	/* Use SPD EEPROM for setup	*/
+#define SPD_EEPROM_ADDRESS {0x53,0x52}	/* SPD i2c spd addresses	*/
+#define CONFIG_PROG_SDRAM_TLB	1	/* setup SDRAM TLB's dynamically*/
 
 /*-----------------------------------------------------------------------
  * I2C