[U-Boot] [PATCH] ppc4xx: For the Kilauea board include the new PPC4xx SDRAM Controller DDR autocalibration routine.

[agraham at amcc.com]

From: Adam Graham <agraham at amcc.com>

Signed-off-by: Adam Graham <agraham at amcc.com>
---
 cpu/ppc4xx/44x_spd_ddr2.c      |   58 ++++++++++++++++++++++++++++++---------
 cpu/ppc4xx/Makefile            |    1 +
 include/asm-ppc/ppc4xx-sdram.h |    2 +-
 include/configs/kilauea.h      |   15 ++++++++++
 4 files changed, 61 insertions(+), 15 deletions(-)

diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c
index 001f2c1..fc1ae5f 100644
--- a/cpu/ppc4xx/44x_spd_ddr2.c
+++ b/cpu/ppc4xx/44x_spd_ddr2.c
@@ -60,7 +60,8 @@
 		       "SDRAM_" #mnemonic, SDRAM_##mnemonic, data);	\
 	} while (0)
 
-static inline void ppc4xx_ibm_ddr2_register_dump(void);
+inline void ppc4xx_ibm_ddr2_register_dump(void);
+void blank_string(int);
 
 #if defined(CONFIG_SPD_EEPROM)
 
@@ -2291,18 +2292,6 @@ static unsigned long is_ecc_enabled(void)
 	return ecc;
 }
 
-static void blank_string(int size)
-{
-	int i;
-
-	for (i=0; i<size; i++)
-		putc('\b');
-	for (i=0; i<size; i++)
-		putc(' ');
-	for (i=0; i<size; i++)
-		putc('\b');
-}
-
 #ifdef CONFIG_DDR_ECC
 /*-----------------------------------------------------------------------------+
  * program_ecc.
@@ -2966,6 +2955,10 @@ static void test(void)
 
 #else /* CONFIG_SPD_EEPROM */
 
+#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
+extern u32 DQS_autocalibration(void);
+#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
+
 /*-----------------------------------------------------------------------------
  * Function:	initdram
  * Description: Configures the PPC405EX(r) DDR1/DDR2 SDRAM memory
@@ -3065,9 +3058,12 @@ phys_size_t initdram(int board_type)
 	/* Set Delay Control Registers */
 
 	mtsdram(SDRAM_DLCR, CFG_SDRAM0_DLCR);
+
+#if !defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
 	mtsdram(SDRAM_RDCC, CFG_SDRAM0_RDCC);
 	mtsdram(SDRAM_RQDC, CFG_SDRAM0_RQDC);
 	mtsdram(SDRAM_RFDC, CFG_SDRAM0_RFDC);
+#endif /* !CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
 
 	/*
 	 * Enable Controller by SDRAM0_MCOPT2[DCEN] = 1:
@@ -3076,18 +3072,52 @@ phys_size_t initdram(int board_type)
 	mfsdram(SDRAM_MCOPT2, val);
 	mtsdram(SDRAM_MCOPT2, val | SDRAM_MCOPT2_DCEN_ENABLE);
 
+#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
+#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
+        /*------------------------------------------------------------------
+         | DQS calibration.
+         +-----------------------------------------------------------------*/
+        DQS_autocalibration();
+#endif /* !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) */
+#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
+
 #if defined(CONFIG_DDR_ECC)
 	ecc_init(CFG_SDRAM_BASE, CFG_MBYTES_SDRAM << 20);
 #endif /* defined(CONFIG_DDR_ECC) */
 
 	ppc4xx_ibm_ddr2_register_dump();
+
+#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
+        /*
+         * Clear potential errors resulting from auto-calibration.
+         * If not done, then we could get an interrupt later on when
+         * exceptions are enabled.
+         */
+        asm volatile ("mfspr 0,0x23c":::"r0" );
+        asm volatile ("mtspr 0x23c,0":::"r0" );
+#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
+
 #endif /* !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) */
 
 	return (CFG_MBYTES_SDRAM << 20);
 }
 #endif /* CONFIG_SPD_EEPROM */
 
-static inline void ppc4xx_ibm_ddr2_register_dump(void)
+#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
+void blank_string(int size)
+{
+	int i;
+
+	for (i=0; i<size; i++)
+		putc('\b');
+	for (i=0; i<size; i++)
+		putc(' ');
+	for (i=0; i<size; i++)
+		putc('\b');
+}
+#endif /* !defined(CONFIG_NAND_U_BOOT) &&  !defined(CONFIG_NAND_SPL) */
+
+inline void ppc4xx_ibm_ddr2_register_dump(void)
 {
 #if defined(DEBUG)
 	printf("\nPPC4xx IBM DDR2 Register Dump:\n");
diff --git a/cpu/ppc4xx/Makefile b/cpu/ppc4xx/Makefile
index c773400..c9788b8 100644
--- a/cpu/ppc4xx/Makefile
+++ b/cpu/ppc4xx/Makefile
@@ -35,6 +35,7 @@ SOBJS	+= kgdb.o
 COBJS	:= 40x_spd_sdram.o
 COBJS	+= 44x_spd_ddr.o
 COBJS	+= 44x_spd_ddr2.o
+COBJS	+= 4xx_ddr2.o
 COBJS	+= 4xx_pci.o
 COBJS	+= 4xx_pcie.o
 COBJS	+= bedbug_405.o
diff --git a/include/asm-ppc/ppc4xx-sdram.h b/include/asm-ppc/ppc4xx-sdram.h
index 0174d62..9848390 100644
--- a/include/asm-ppc/ppc4xx-sdram.h
+++ b/include/asm-ppc/ppc4xx-sdram.h
@@ -256,6 +256,7 @@
 #define SDRAM_DLYCAL_DLCV_ENCODE(x)	(((x)<<2) & SDRAM_DLYCAL_DLCV_MASK)
 #define SDRAM_DLYCAL_DLCV_DECODE(x)	(((x) & SDRAM_DLYCAL_DLCV_MASK)>>2)
 
+#if !defined(CONFIG_405EX)
 /*
  * Memory queue defines
  */
@@ -293,7 +294,6 @@
 
 #define SDRAM_PLBADDUHB		(SDRAMQ_DCR_BASE+0x10)  /* PLB base address upper 32 LL */
 
-#if !defined(CONFIG_405EX)
 /*
  * Memory Bank 0-7 configuration
  */
diff --git a/include/configs/kilauea.h b/include/configs/kilauea.h
index a475f97..e417295 100644
--- a/include/configs/kilauea.h
+++ b/include/configs/kilauea.h
@@ -222,6 +222,18 @@
  * DDR SDRAM
  *----------------------------------------------------------------------*/
 #define CFG_MBYTES_SDRAM        (256)		/* 256MB			*/
+#define CONFIG_PPC4xx_DDR_AUTOCALIBRATION	/* IBM DDR autocalibration */
+
+/*
+ * DDR Autocalibration Method_B is the default.
+ * Note: DDR Autocalibration Method_A scans the full range of possible PPC4xx
+ *       SDRAM Controller DDR autocalibration values and takes a lot longer
+ *       to run than Method_B.
+ * (See the Method_A and Method_B algorithm discription in the file:
+ *	cpu/ppc4xx/4xx_ddr2.c)
+ * Define to use DDR autocalibration Method_A
+ */
+#undef CONFIG_PPC4xx_DDR_METHOD_A
 
 #define	CFG_SDRAM0_MB0CF_BASE	((  0 << 20) + CFG_SDRAM_BASE)
 
@@ -386,6 +398,9 @@
 #define CONFIG_HAS_ETH1		1	/* add support for "eth1addr"   */
 #define CONFIG_PHY1_ADDR	2
 
+/* Debug messages for the DDR autocalibration */
+#define CONFIG_AUTOCALIB		"silent\0"  /* default is non-verbose */
+
 /*
  * Default environment variables
  */
-- 
1.5.5