diff options
Diffstat (limited to 'cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c')
| -rw-r--r-- | cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c | 74 |
1 files changed, 45 insertions, 29 deletions
diff --git a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c index 1e3e20d..91bf582 100644 --- a/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c +++ b/cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c @@ -61,6 +61,8 @@ #define NUMLOOPS 1 /* configure as you deem approporiate */ #define NUMMEMWORDS 16 +#define SDRAM_RDCC_RDSS_VAL(n) SDRAM_RDCC_RDSS_DECODE(ddr_rdss_opt(n)) + /* Private Structure Definitions */ struct autocal_regs { @@ -147,6 +149,13 @@ ulong __ddr_scan_option(ulong default_val) } ulong ddr_scan_option(ulong) __attribute__((weak, alias("__ddr_scan_option"))); +u32 __ddr_rdss_opt(u32 default_val) +{ + return default_val; +} +u32 ddr_rdss_opt(ulong) __attribute__((weak, alias("__ddr_rdss_opt"))); + + static u32 *get_membase(int bxcr_num) { ulong bxcf; @@ -341,6 +350,7 @@ static int short_mem_test(u32 *base_address) ppcDcbf((ulong)&(base_address[j])); } sync(); + iobarrier_rw(); for (l = 0; l < NUMLOOPS; l++) { for (j = 0; j < NUMMEMWORDS; j++) { if (base_address[j] != test[i][j]) { @@ -355,6 +365,7 @@ static int short_mem_test(u32 *base_address) ppcDcbf((u32)&(base_address[j])); } /* for (j = 0; j < NUMMEMWORDS; j++) */ sync(); + iobarrier_rw(); } /* for (l=0; l<NUMLOOPS; l++) */ } @@ -447,7 +458,8 @@ static u32 DQS_calibration_methodA(struct ddrautocal *cal) * Program RDCC register * Read sample cycle auto-update enable */ - mtsdram(SDRAM_RDCC, SDRAM_RDCC_RDSS_T1 | SDRAM_RDCC_RSAE_ENABLE); + mtsdram(SDRAM_RDCC, + ddr_rdss_opt(SDRAM_RDCC_RDSS_T2) | SDRAM_RDCC_RSAE_ENABLE); #ifdef DEBUG mfsdram(SDRAM_RDCC, temp); @@ -633,7 +645,8 @@ static u32 program_DQS_calibration_methodB(struct ddrautocal *ddrcal) * Program RDCC register * Read sample cycle auto-update enable */ - mtsdram(SDRAM_RDCC, SDRAM_RDCC_RDSS_T2 | SDRAM_RDCC_RSAE_ENABLE); + mtsdram(SDRAM_RDCC, + ddr_rdss_opt(SDRAM_RDCC_RDSS_T2) | SDRAM_RDCC_RSAE_ENABLE); #ifdef DEBUG mfsdram(SDRAM_RDCC, temp); @@ -1091,32 +1104,36 @@ u32 DQS_autocalibration(void) * if no passing window was found, or is the * size of the RFFD passing window. */ - if (result != 0) { - tcal.autocal.flags = 1; - debug("*** (%d)(%d) result passed window size: 0x%08x, " - "rqfd = 0x%08x, rffd = 0x%08x, rdcc = 0x%08x\n", - wdtr, clkp, result, ddrcal.rqfd, - ddrcal.rffd, ddrcal.rdcc); - /* - * Save the SDRAM_WRDTR and SDRAM_CLKTR - * settings for the largest returned - * RFFD passing window size. - */ - if (result > best_result) { + /* + * want the lowest Read Sample Cycle Select + */ + val = SDRAM_RDCC_RDSS_DECODE(val); + debug("*** (%d) (%d) current_rdcc, best_rdcc\n", + val, best_rdcc); + + if ((result != 0) && + (val >= SDRAM_RDCC_RDSS_VAL(SDRAM_RDCC_RDSS_T2))) { + if (((result == best_result) && (val < best_rdcc)) || + ((result > best_result) && (val <= best_rdcc))) { + tcal.autocal.flags = 1; + debug("*** (%d)(%d) result passed window " + "size: 0x%08x, rqfd = 0x%08x, " + "rffd = 0x%08x, rdcc = 0x%08x\n", + wdtr, clkp, result, ddrcal.rqfd, + ddrcal.rffd, ddrcal.rdcc); + /* - * want the lowest Read Sample Cycle Select + * Save the SDRAM_WRDTR and SDRAM_CLKTR + * settings for the largest returned + * RFFD passing window size. */ - val = (val & SDRAM_RDCC_RDSS_MASK) >> 30; - debug("*** (%d) (%d) current_rdcc, best_rdcc\n", - val, best_rdcc); - if (val <= best_rdcc) { - best_rdcc = val; - tcal.clocks.wrdtr = wdtr; - tcal.clocks.clktr = clkp; - tcal.clocks.rdcc = (val << 30); - tcal.autocal.rqfd = ddrcal.rqfd; - tcal.autocal.rffd = ddrcal.rffd; - best_result = result; + best_rdcc = val; + tcal.clocks.wrdtr = wdtr; + tcal.clocks.clktr = clkp; + tcal.clocks.rdcc = SDRAM_RDCC_RDSS_ENCODE(val); + tcal.autocal.rqfd = ddrcal.rqfd; + tcal.autocal.rffd = ddrcal.rffd; + best_result = result; if (verbose_lvl > 2) { printf("** (%d)(%d) " @@ -1152,9 +1169,8 @@ u32 DQS_autocalibration(void) "loop FCSR: 0x%08x\n", wdtr, clkp, val); } - } /* if (val <= best_rdcc) */ - } /* if (result >= best_result) */ - } /* if (result != 0) */ + } + } /* if ((result != 0) && (val >= (ddr_rdss_opt()))) */ scan_list++; } /* while ((scan_list->wrdtr != -1) && (scan_list->clktr != -1)) */ |