[U-Boot] [PATCH v2] ppc4xx: Fix DDR2 auto calibration on Kilauea 600MHz

[Victor Gallardo]

Signed-off-by: Victor Gallardo <vgallardo at amcc.com>
Signed-off-by: Adam Graham <agraham at amcc.com>
---
 v2:
 - Add comments on why this is need for 200MHz PLB bus 
 - Minor coding style cleanup

 board/amcc/kilauea/kilauea.c        |   31 +++++++++++++++++++++++++++++++
 cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c |    5 -----
 include/asm-ppc/ppc4xx-sdram.h      |    6 ++++++
 3 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/board/amcc/kilauea/kilauea.c b/board/amcc/kilauea/kilauea.c
index 7b10255..fcab9ca 100644
--- a/board/amcc/kilauea/kilauea.c
+++ b/board/amcc/kilauea/kilauea.c
@@ -374,3 +374,34 @@ int post_hotkeys_pressed(void)
 	return 0;	/* No hotkeys supported */
 }
 #endif /* CONFIG_POST */
+
+#if defined(CONFIG_PPC4xx_DDR_AUTOCALIBRATION)
+/*
+ * This is for quicker auto calibration boot up once WRDTR and CLKTR
+ * values for the kilauea board were determined and are therefore known.
+ *
+ * Use these scan options for PLB bus greater than or equal 200MHz
+ * else use the defaults. These options are known to return a cycle
+ * delay of T2 or better with a 200MHz PLB bus. Scanning the
+ * full list of WDTR/CLKTR should work, but currently it does not.
+ * HW team is investigating.
+ */
+/* List of (SDRAM_WRDTR.[WDTR], SDRAM_CLKTR.[CLKP]) pairs to try */
+struct sdram_timing quick_scan_options[] = {
+	{0, 3}, {1, 1}, {1, 2}, {1, 3},
+	{2, 1}, {2, 2}, {2, 3}, {3, 1},
+	{3, 2}, {4, 1}, {-1, -1}
+};
+
+ulong ddr_scan_option(ulong default_val)
+{
+	PPC4xx_SYS_INFO board_cfg;
+
+	get_sys_info(&board_cfg);
+
+	if (board_cfg.freqPLB >= 200000000)
+		return (ulong)(quick_scan_options);
+	else
+		return (ulong)default_val;
+}
+#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
diff --git a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
index 83b9883..3ba8176 100644
--- a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
+++ b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
@@ -79,11 +79,6 @@ struct ddrautocal {
 	u32 flags;
 };
 
-struct sdram_timing {
-	u32 wrdtr;
-	u32 clktr;
-};
-
 struct sdram_timing_clks {
 	u32 wrdtr;
 	u32 clktr;
diff --git a/include/asm-ppc/ppc4xx-sdram.h b/include/asm-ppc/ppc4xx-sdram.h
index 8efa557..2ba5619 100644
--- a/include/asm-ppc/ppc4xx-sdram.h
+++ b/include/asm-ppc/ppc4xx-sdram.h
@@ -1403,6 +1403,12 @@
 #endif /* CONFIG_SDRAM_PPC4xx_DENALI_DDR2 */
 
 #ifndef __ASSEMBLY__
+
+struct sdram_timing {
+	u32 wrdtr;
+	u32 clktr;
+};
+
 /*
  * Prototypes
  */
-- 
1.5.5