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ppc4xx: Fix PCIE PLL lock on 440SPe Yucca board

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u-boot reports a PCIE PLL lock error at boot time on Yucca board, and
left PCIe nonfunctional. This is fixed by making u-boot function
ppc4xx_init_pcie() to wait 300 uS after negating reset before the
first check of the PLL lock.

Signed-off-by: Rupjyoti Sarmah <rsarmah@amcc.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Rupjyoti Sarmah 2009-09-21 11:26:19 -07:00 committed by Stefan Roese
parent 91d599044c
commit fcdb36b85a
1 changed files with 16 additions and 9 deletions
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25
cpu/ppc4xx/4xx_pcie.c
View File

@ -374,28 +374,35 @@ int ppc4xx_init_pcie(void)
/* Set PLL clock receiver to LVPECL */
SDR_WRITE(PESDR0_PLLLCT1, SDR_READ(PESDR0_PLLLCT1) | 1 << 28);
if (check_error())
return -1;
if (check_error()) {
printf("ERROR: failed to set PCIe reference clock receiver --"
"PESDR0_PLLLCT1 = 0x%08x\n", SDR_READ(PESDR0_PLLLCT1));
return -1;
}
/* Did resistance calibration work? */
if (!(SDR_READ(PESDR0_PLLLCT2) & 0x10000)) {
printf("ERROR: PCIe resistance calibration failed --"
"PESDR0_PLLLCT2 = 0x%08x\n", SDR_READ(PESDR0_PLLLCT2));
if (!(SDR_READ(PESDR0_PLLLCT2) & 0x10000))
{
printf("PCIE: PESDR_PLLCT2 resistance calibration failed (0x%08x)\n",
SDR_READ(PESDR0_PLLLCT2));
return -1;
}
/* De-assert reset of PCIe PLL, wait for lock */
SDR_WRITE(PESDR0_PLLLCT1, SDR_READ(PESDR0_PLLLCT1) & ~(1 << 24));
udelay(3);
udelay(300); /* 300 uS is maximum time lock should take */
while (time_out) {
if (!(SDR_READ(PESDR0_PLLLCT3) & 0x10000000)) {
time_out--;
udelay(1);
udelay(20); /* Wait 20 uS more if needed */
} else
break;
}
if (!time_out) {
printf("PCIE: VCO output not locked\n");
printf("ERROR: PCIe PLL VCO output not locked to ref clock --"
"PESDR0_PLLLCTS=0x%08x\n", SDR_READ(PESDR0_PLLLCT3));
return -1;
}
return 0;