Using this define, a board can define an opimized RFDC value and use the auto calibration code to "tune" the remaining DDR2 controller calibration register.
Signed-off-by: Stefan Roese sr@denx.de --- arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c b/arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c index 0f69ef9..5e35c61 100644 --- a/arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c +++ b/arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c @@ -767,6 +767,13 @@ static u32 DQS_calibration_methodB(struct ddrautocal *cal)
debug("\n\n");
+#if defined(CONFIG_DDR_RFDC_FIXED) + mtsdram(SDRAM_RFDC, CONFIG_DDR_RFDC_FIXED); + size = 512; + rffd_average = CONFIG_DDR_RFDC_FIXED & SDRAM_RFDC_RFFD_MASK; + mfsdram(SDRAM_RDCC, rdcc); /* record this value */ + cal->rdcc = rdcc; +#else in_window = 0; rdcc = 0;
@@ -830,6 +837,7 @@ static u32 DQS_calibration_methodB(struct ddrautocal *cal) rffd_average = SDRAM_RFDC_RFFD_MAX;
mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd_average)); +#endif
rffd = rffd_average; in_window = 0; @@ -1211,10 +1219,14 @@ u32 DQS_autocalibration(void) debug("*** best_result: read value SDRAM_RQDC 0x%08x\n", rqdc_reg);
+#if defined(CONFIG_DDR_RFDC_FIXED) + mtsdram(SDRAM_RFDC, CONFIG_DDR_RFDC_FIXED); +#else mfsdram(SDRAM_RFDC, rfdc_reg); rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK); mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(tcal.autocal.rffd)); +#endif
mfsdram(SDRAM_RFDC, rfdc_reg); debug("*** best_result: read value SDRAM_RFDC 0x%08x\n",