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Diffstat (limited to 'cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c')
-rw-r--r--cpu/ppc4xx/4xx_ibm_ddr2_autocalib.c74
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)) */