[PATCH] Speed optimization of AMCC Sequoia/Rainier DDR2 setup

As provided by the AMCC applications team, this patch optimizes the
DDR2 setup for 166MHz bus speed. The values provided are also save
to use on a "normal" 133MHz PLB bus system. Only the refresh counter
setup has to be adjusted as done in this patch.

For this the NAND booting version had to include the "speed.c" file
from the cpu/ppc4xx directory. With this addition the NAND SPL image
will just fit into the 4kbytes of program space. gcc version 4.x as
provided with ELDK 4.x is needed to generate this optimized code.

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

board/amcc/sequoia/sdram.c

@@ -6,7 +6,7 @@
  * Alain Saurel,            AMCC/IBM, alain.saurel@fr.ibm.com
  * Robert Snyder,           AMCC/IBM, rob.snyder@fr.ibm.com
  *
- * (C) Copyright 2006
+ * (C) Copyright 2006-2007
  * Stefan Roese, DENX Software Engineering, sr@denx.de.
  *
  * This program is free software; you can redistribute it and/or
@@ -379,16 +379,18 @@ void denali_core_search_data_eye(unsigned long memory_size)
 long int initdram (int board_type)
 {
 #if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
+	ulong speed = get_bus_freq(0);
+
 	mtsdram(DDR0_02, 0x00000000);
 
 	mtsdram(DDR0_00, 0x0000190A);
 	mtsdram(DDR0_01, 0x01000000);
 	mtsdram(DDR0_03, 0x02030602);
-	mtsdram(DDR0_04, 0x13030300);
-	mtsdram(DDR0_05, 0x0202050E);
-	mtsdram(DDR0_06, 0x0104C823);
+	mtsdram(DDR0_04, 0x0A020200);
+	mtsdram(DDR0_05, 0x02020308);
+	mtsdram(DDR0_06, 0x0102C812);
 	mtsdram(DDR0_07, 0x000D0100);
-	mtsdram(DDR0_08, 0x02360001);
+	mtsdram(DDR0_08, 0x02430001);
 	mtsdram(DDR0_09, 0x00011D5F);
 	mtsdram(DDR0_10, 0x00000300);
 	mtsdram(DDR0_11, 0x0027C800);
@@ -402,13 +404,16 @@ long int initdram (int board_type)
 	mtsdram(DDR0_22, 0x00267F0B);
 	mtsdram(DDR0_23, 0x00000000);
 	mtsdram(DDR0_24, 0x01010002);
-	mtsdram(DDR0_26, 0x5B260181);
+	if (speed > 133333333)
+		mtsdram(DDR0_26, 0x5B26050C);
+	else
+		mtsdram(DDR0_26, 0x5B260408);
 	mtsdram(DDR0_27, 0x0000682B);
 	mtsdram(DDR0_28, 0x00000000);
 	mtsdram(DDR0_31, 0x00000000);
 	mtsdram(DDR0_42, 0x01000006);
-	mtsdram(DDR0_43, 0x050A0200);
-	mtsdram(DDR0_44, 0x00000005);
+	mtsdram(DDR0_43, 0x030A0200);
+	mtsdram(DDR0_44, 0x00000003);
 	mtsdram(DDR0_02, 0x00000001);
 
 	wait_for_dlllock();

include/ppc440.h

@@ -3293,26 +3293,26 @@ typedef struct { unsigned long	add;	/* gpio core base address */
 /*
  * Macros for accessing the indirect EBC registers
  */
-#define mtebc(reg, data)	{ mtdcr(ebccfga,reg);mtdcr(ebccfgd,data); }
-#define mfebc(reg, data)	{ mtdcr(ebccfga,reg);data = mfdcr(ebccfgd); }
+#define mtebc(reg, data)	do { mtdcr(ebccfga,reg);mtdcr(ebccfgd,data); } while (0)
+#define mfebc(reg, data)	do { mtdcr(ebccfga,reg);data = mfdcr(ebccfgd); } while (0)
 
 /*
  * Macros for accessing the indirect SDRAM controller registers
  */
-#define mtsdram(reg, data)	{ mtdcr(memcfga,reg);mtdcr(memcfgd,data); }
-#define mfsdram(reg, data)	{ mtdcr(memcfga,reg);data = mfdcr(memcfgd); }
+#define mtsdram(reg, data)	do { mtdcr(memcfga,reg);mtdcr(memcfgd,data); } while (0)
+#define mfsdram(reg, data)	do { mtdcr(memcfga,reg);data = mfdcr(memcfgd); } while (0)
 
 /*
  * Macros for accessing the indirect clocking controller registers
  */
-#define mtclk(reg, data)	{ mtdcr(clkcfga,reg);mtdcr(clkcfgd,data); }
-#define mfclk(reg, data)	{ mtdcr(clkcfga,reg);data = mfdcr(clkcfgd); }
+#define mtclk(reg, data)	do { mtdcr(clkcfga,reg);mtdcr(clkcfgd,data); } while (0)
+#define mfclk(reg, data)	do { mtdcr(clkcfga,reg);data = mfdcr(clkcfgd); } while (0)
 
 /*
  * Macros for accessing the sdr controller registers
  */
-#define mtsdr(reg, data)	{ mtdcr(sdrcfga,reg);mtdcr(sdrcfgd,data); }
-#define mfsdr(reg, data)	{ mtdcr(sdrcfga,reg);data = mfdcr(sdrcfgd); }
+#define mtsdr(reg, data)	do { mtdcr(sdrcfga,reg);mtdcr(sdrcfgd,data); } while (0)
+#define mfsdr(reg, data)	do { mtdcr(sdrcfga,reg);data = mfdcr(sdrcfgd); } while (0)
 
 
 #ifndef __ASSEMBLY__

nand_spl/board/amcc/sequoia/Makefile

@@ -30,7 +30,7 @@ AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
 
 SOBJS	= start.o init.o resetvec.o
-COBJS	= nand_boot.o ndfc.o sdram.o
+COBJS	= nand_boot.o ndfc.o sdram.o speed.o
 
 SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
@@ -69,6 +69,10 @@ $(obj)start.S:
 	@rm -f $(obj)start.S
 	ln -s $(SRCTREE)/cpu/ppc4xx/start.S $(obj)start.S
 
+$(obj)speed.c:
+	@rm -f $(obj)speed.c
+	ln -s $(SRCTREE)/cpu/ppc4xx/speed.c $(obj)speed.c
+
 # from board directory
 $(obj)init.S:
 	@rm -f $(obj)init.S