diff options
author | Rupjyoti Sarmah <rsarmah@amcc.com> | 2009-09-21 18:26:19 (GMT) |
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committer | Stefan Roese <sr@denx.de> | 2009-09-23 13:46:08 (GMT) |
commit | fcdb36b85ac033c09a9762a0a14808f7cb2ed54c (patch) | |
tree | 17b4341af26367ecfe4a8f3f81c63776d765fce5 /cpu/ppc4xx | |
parent | 91d599044caac4a8c228115b16cf3b073f902080 (diff) | |
download | u-boot-fcdb36b85ac033c09a9762a0a14808f7cb2ed54c.tar.xz |
ppc4xx: Fix PCIE PLL lock on 440SPe Yucca board
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>
Diffstat (limited to 'cpu/ppc4xx')
-rw-r--r-- | cpu/ppc4xx/4xx_pcie.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/cpu/ppc4xx/4xx_pcie.c b/cpu/ppc4xx/4xx_pcie.c index 07fbb0e..e880c28 100644 --- a/cpu/ppc4xx/4xx_pcie.c +++ b/cpu/ppc4xx/4xx_pcie.c @@ -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()) + 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; |