summaryrefslogtreecommitdiff
path: root/arch/powerpc
diff options
context:
space:
mode:
authorStefan Roese <sr@denx.de>2010-05-25 15:33:14 +0200
committerStefan Roese <sr@denx.de>2010-07-01 10:26:15 +0200
commite9c020df9608c58ccd35a000bceadbb91ffe5f23 (patch)
treeb55fcd1f487fa9bb26500411a3bfb48a13f3b468 /arch/powerpc
parent066003b2c5540bde3c29ac6f8a4fbde24dd0b2f0 (diff)
downloadu-boot-imx-e9c020df9608c58ccd35a000bceadbb91ffe5f23.zip
u-boot-imx-e9c020df9608c58ccd35a000bceadbb91ffe5f23.tar.gz
u-boot-imx-e9c020df9608c58ccd35a000bceadbb91ffe5f23.tar.bz2
ppc4xx: DDR2: Complete RDSS configuration on non-SPD based boards
As described in item #10 of the SDRAM initialization (chapter 22.2.9 of the PPC460EX/EXr/GT users manual), RDSS may need to be adjusted. The code for this is now factored out and executed for non-SPD based boards as well. Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c52
1 files changed, 38 insertions, 14 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c b/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
index faddee9..b2cc2fe 100644
--- a/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
+++ b/arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c
@@ -68,6 +68,31 @@
"SDRAM_" #mnemonic, SDRAM_##mnemonic, data); \
} while (0)
+#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
+static void update_rdcc(void)
+{
+ u32 val;
+
+ /*
+ * Complete RDSS configuration as mentioned on page 7 of the AMCC
+ * PowerPC440SP/SPe DDR2 application note:
+ * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
+ *
+ * Or item #10 "10. Complete RDSS configuration" in chapter
+ * "22.2.9 SDRAM Initialization" of AMCC PPC460EX/EXr/GT users
+ * manual.
+ */
+ mfsdram(SDRAM_RTSR, val);
+ if ((val & SDRAM_RTSR_TRK1SM_MASK) == SDRAM_RTSR_TRK1SM_ATPLS1) {
+ mfsdram(SDRAM_RDCC, val);
+ if ((val & SDRAM_RDCC_RDSS_MASK) != SDRAM_RDCC_RDSS_T4) {
+ val += 0x40000000;
+ mtsdram(SDRAM_RDCC, val);
+ }
+ }
+}
+#endif
+
#if defined(CONFIG_440)
/*
* This DDR2 setup code can dynamically setup the TLB entries for the DDR2
@@ -620,6 +645,12 @@ phys_size_t initdram(int board_type)
#else
program_DQS_calibration(dimm_populated, iic0_dimm_addr, num_dimm_banks);
#endif
+ /*
+ * Now complete RDSS configuration as mentioned on page 7 of the AMCC
+ * PowerPC440SP/SPe DDR2 application note:
+ * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
+ */
+ update_rdcc();
#ifdef CONFIG_DDR_ECC
/*------------------------------------------------------------------
@@ -2692,20 +2723,6 @@ calibration_loop:
blank_string(strlen(str));
#endif /* CONFIG_DDR_RQDC_FIXED */
- /*
- * Now complete RDSS configuration as mentioned on page 7 of the AMCC
- * PowerPC440SP/SPe DDR2 application note:
- * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
- */
- mfsdram(SDRAM_RTSR, val);
- if ((val & SDRAM_RTSR_TRK1SM_MASK) == SDRAM_RTSR_TRK1SM_ATPLS1) {
- mfsdram(SDRAM_RDCC, val);
- if ((val & SDRAM_RDCC_RDSS_MASK) != SDRAM_RDCC_RDSS_T4) {
- val += 0x40000000;
- mtsdram(SDRAM_RDCC, val);
- }
- }
-
mfsdram(SDRAM_DLCR, val);
debug("%s[%d] DLCR: 0x%08lX\n", __FUNCTION__, __LINE__, val);
mfsdram(SDRAM_RQDC, val);
@@ -3007,6 +3024,13 @@ phys_size_t initdram(int board_type)
#endif /* !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) */
#endif /* CONFIG_PPC4xx_DDR_AUTOCALIBRATION */
+ /*
+ * Now complete RDSS configuration as mentioned on page 7 of the AMCC
+ * PowerPC440SP/SPe DDR2 application note:
+ * "DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
+ */
+ update_rdcc();
+
#if defined(CONFIG_DDR_ECC)
do_program_ecc(0);
#endif /* defined(CONFIG_DDR_ECC) */