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ppc4xx: Add CONFIG_DDR_RFDC_FIXED to allow board specific RFDC values

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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>
This commit is contained in:
Stefan Roese 2010-07-20 07:06:03 +02:00
parent 5bf39a96c2
commit eab9800182
1 changed files with 12 additions and 0 deletions
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12
arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c
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@ -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 /* CONFIG_DDR_RFDC_FIXED */
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 /* CONFIG_DDR_RFDC_FIXED */
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 /* CONFIG_DDR_RFDC_FIXED */
mfsdram(SDRAM_RFDC, rfdc_reg);
rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK);
mtsdram(SDRAM_RFDC, rfdc_reg |
SDRAM_RFDC_RFFD_ENCODE(tcal.autocal.rffd));
#endif /* CONFIG_DDR_RFDC_FIXED */
mfsdram(SDRAM_RFDC, rfdc_reg);
debug("*** best_result: read value SDRAM_RFDC 0x%08x\n",