Whitebox
/
u-boot
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ppc4xx: Update Katmai/44x_spd_ddr2.c code for optimal DDR2 setup

Browse Source 
On Katmai the complete auto-calibration somehow doesn't seem to
produce the best results, meaning optimal values for RQFD/RFFD.
This was discovered by GDA using a high bandwidth scope,
analyzing the DDR2 signals. GDA provided a fixed value for RQFD,
so now on Katmai "only" RFFD is auto-calibrated.

This patch also adds RDCC calibration as mentioned on page 7 of
the AMCC PowerPC440SP/SPe DDR2 application note:
"DDR1/DDR2 Initialization Sequence and Dynamic Tuning"

Signed-off-by: Stefan Roese <sr@denx.de>
master
Stefan Roese 17 years ago
parent 5c740711f0
commit 845c6c95db
4 changed files with 61 additions and 18 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 14
      board/amcc/katmai/katmai.c
  2. 52
      cpu/ppc4xx/44x_spd_ddr2.c
  3. 1
      include/configs/katmai.h
  4. 12
      include/ppc440.h

14
board/amcc/katmai/katmai.c
Unescape View File

@ -1,5 +1,5 @@
/*
* (C) Copyright 2007
* (C) Copyright 2007-2008
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* See file CREDITS for list of people who contributed to this
@ -246,6 +246,18 @@ int checkboard (void)
return 0;
}
/*
* Override the default functions in cpu/ppc4xx/44x_spd_ddr2.c with
* board specific values.
*/
u32 ddr_wrdtr(u32 default_val) {
return (SDRAM_WRDTR_LLWP_1_CYC | SDRAM_WRDTR_WTR_180_DEG_ADV | 0x823);
}
u32 ddr_clktr(u32 default_val) {
return (SDRAM_CLKTR_CLKP_90_DEG_ADV);
}
#if defined(CFG_DRAM_TEST)
int testdram (void)
{

52
cpu/ppc4xx/44x_spd_ddr2.c
Unescape View File

@ -3,7 +3,7 @@
* This SPD SDRAM detection code supports AMCC PPC44x cpu's with a
* DDR2 controller (non Denali Core). Those are 440SP/SPe.
*
* (C) Copyright 2007
* (C) Copyright 2007-2008
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* COPYRIGHT AMCC CORPORATION 2004
@ -2409,17 +2409,10 @@ static void program_DQS_calibration(unsigned long *dimm_populated,
* Read sample cycle auto-update enable
*-----------------------------------------------------------------*/
/*
* Modified for the Katmai platform: with some DIMMs, the DDR2
* controller automatically selects the T2 read cycle, but this
* proves unreliable. Go ahead and force the DDR2 controller
* to use the T4 sample and disable the automatic update of the
* RDSS field.
*/
mfsdram(SDRAM_RDCC, val);
mtsdram(SDRAM_RDCC,
(val & ~(SDRAM_RDCC_RDSS_MASK | SDRAM_RDCC_RSAE_MASK))
| (SDRAM_RDCC_RDSS_T4 | SDRAM_RDCC_RSAE_DISABLE));
| SDRAM_RDCC_RSAE_ENABLE);
/*------------------------------------------------------------------
* Program RQDC register
@ -2512,10 +2505,7 @@ static void DQS_calibration_process(void)
{
unsigned long rfdc_reg;
unsigned long rffd;
unsigned long rqdc_reg;
unsigned long rqfd;
unsigned long val;
long rqfd_average;
long rffd_average;
long max_start;
long min_end;
@ -2533,10 +2523,14 @@ static void DQS_calibration_process(void)
long max_end;
unsigned char fail_found;
unsigned char pass_found;
#if !defined(CONFIG_DDR_RQDC_FIXED)
u32 rqdc_reg;
u32 rqfd;
u32 rqfd_start;
u32 rqfd_average;
int loopi = 0;
char str[] = "Auto calibration -";
char slash[] = "\\|/-\\|/-";
int loopi = 0;
/*------------------------------------------------------------------
* Test to determine the best read clock delay tuning bits.
@ -2571,6 +2565,16 @@ calibration_loop:
mfsdram(SDRAM_RQDC, rqdc_reg);
mtsdram(SDRAM_RQDC, (rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
SDRAM_RQDC_RQFD_ENCODE(rqfd_start));
#else /* CONFIG_DDR_RQDC_FIXED */
/*
* On Katmai the complete auto-calibration somehow doesn't seem to
* produce the best results, meaning optimal values for RQFD/RFFD.
* This was discovered by GDA using a high bandwidth scope,
* analyzing the DDR2 signals. GDA provided a fixed value for RQFD,
* so now on Katmai "only" RFFD is auto-calibrated.
*/
mtsdram(SDRAM_RQDC, CONFIG_DDR_RQDC_FIXED);
#endif /* CONFIG_DDR_RQDC_FIXED */
max_start = 0;
min_end = 0;
@ -2655,6 +2659,7 @@ calibration_loop:
/* now fix RFDC[RFFD] found and find RQDC[RQFD] */
mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd_average));
#if !defined(CONFIG_DDR_RQDC_FIXED)
max_pass_length = 0;
max_start = 0;
max_end = 0;
@ -2727,8 +2732,6 @@ calibration_loop:
spd_ddr_init_hang ();
}
blank_string(strlen(str));
if (rqfd_average < 0)
rqfd_average = 0;
@ -2739,12 +2742,31 @@ calibration_loop:
(rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
SDRAM_RQDC_RQFD_ENCODE(rqfd_average));
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%08X\n", __FUNCTION__, __LINE__, val);
mfsdram(SDRAM_RQDC, val);
debug("%s[%d] RQDC: 0x%08X\n", __FUNCTION__, __LINE__, val);
mfsdram(SDRAM_RFDC, val);
debug("%s[%d] RFDC: 0x%08X\n", __FUNCTION__, __LINE__, val);
mfsdram(SDRAM_RDCC, val);
debug("%s[%d] RDCC: 0x%08X\n", __FUNCTION__, __LINE__, val);
}
#else /* calibration test with hardvalues */
/*-----------------------------------------------------------------------------+

1
include/configs/katmai.h
Unescape View File

@ -111,6 +111,7 @@
#define CONFIG_SPD_EEPROM 1 /* Use SPD EEPROM for setup */
#define SPD_EEPROM_ADDRESS {0x51, 0x52} /* SPD i2c spd addresses*/
#define CONFIG_DDR_ECC 1 /* with ECC support */
#define CONFIG_DDR_RQDC_FIXED 0x80000038 /* optimal value found by GDA*/
#undef CONFIG_STRESS
/*-----------------------------------------------------------------------

12
include/ppc440.h
Unescape View File

@ -492,6 +492,7 @@
#define SDRAM_ECCCR 0x98 /* ECC error status */
#define SDRAM_CID 0xA4 /* core ID */
#define SDRAM_RID 0xA8 /* revision ID */
#define SDRAM_RTSR 0xB1 /* run time status tracking */
/*-----------------------------------------------------------------------------+
| Memory Controller Status
@ -605,8 +606,8 @@
#define SDRAM_RFDC_ARSE_ENABLE 0x00000000
#define SDRAM_RFDC_RFOS_MASK 0x007F0000
#define SDRAM_RFDC_RFOS_ENCODE(n) ((((unsigned long)(n))&0x7F)<<16)
#define SDRAM_RFDC_RFFD_MASK 0x000003FF
#define SDRAM_RFDC_RFFD_ENCODE(n) ((((unsigned long)(n))&0x3FF)<<0)
#define SDRAM_RFDC_RFFD_MASK 0x000007FF
#define SDRAM_RFDC_RFFD_ENCODE(n) ((((unsigned long)(n))&0x7FF)<<0)
#define SDRAM_RFDC_RFFD_MAX 0x7FF
@ -690,6 +691,7 @@
#define SDRAM_CLKTR_CLKP_MASK 0xC0000000
#define SDRAM_CLKTR_CLKP_0_DEG 0x00000000
#define SDRAM_CLKTR_CLKP_180_DEG_ADV 0x80000000
#define SDRAM_CLKTR_CLKP_90_DEG_ADV 0x40000000
/*-----------------------------------------------------------------------------+
| SDRAM Write Timing Register
@ -790,6 +792,12 @@
#define SDRAM_BXCF_M_BE_DISABLE 0x00000000 /* Memory Bank Enable */
#define SDRAM_BXCF_M_BE_ENABLE 0x00000001 /* Memory Bank Enable */
#define SDRAM_RTSR_TRK1SM_MASK 0xC0000000 /* Tracking State Mach 1*/
#define SDRAM_RTSR_TRK1SM_ATBASE 0x00000000 /* atbase state */
#define SDRAM_RTSR_TRK1SM_MISSED 0x40000000 /* missed state */
#define SDRAM_RTSR_TRK1SM_ATPLS1 0x80000000 /* atpls1 state */
#define SDRAM_RTSR_TRK1SM_RESET 0xC0000000 /* reset state */
#define SDR0_MFR_FIXD 0x10000000 /* Workaround for PCI/DMA */
#endif /* CONFIG_440SPE */

Write Preview
Loading…
Cancel
Save