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ppc4xx: Add CONFIG_DDR_RFDC_FIXED to allow board specific RFDC values

PATCH Superseded Stefan Roese 1 participant 2 messages Jul 20, 2010 – Jul 23, 2010 PowerPC

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Stefan Roese

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PATCH v2 1/1 ppc4xx: Add CONFIG_DDR_RFDC_FIXED to allow board specific RFDC values

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 <[email protected]>

---
v2:
- Added comment to #else and #endif to better see where it belongs to

 arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
arch/powerpc/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c +12 -0
index 0f69ef9..5e35c61 100644
@@ -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",
Signature · 1 line
1.7.1.1
author
#1 lore raw

PATCH v2 1/1 ppc4xx: Add CONFIG_DDR_RFDC_FIXED to allow board specific RFDC values

Quoted 3 lines · On Tuesday 20 July 2010 07:06:03 Stefan Roese wrote:

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.

Applied to u-boot-ppc4xx/master. Thanks.

Cheers,
Stefan

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