diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc83xx/pcie.c')
| -rw-r--r-- | arch/powerpc/cpu/mpc83xx/pcie.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/arch/powerpc/cpu/mpc83xx/pcie.c b/arch/powerpc/cpu/mpc83xx/pcie.c index d3f979f3c4..b500ddd3f3 100644 --- a/arch/powerpc/cpu/mpc83xx/pcie.c +++ b/arch/powerpc/cpu/mpc83xx/pcie.c @@ -174,6 +174,41 @@ static void mpc83xx_pcie_register_hose(int bus, struct pci_region *reg, #endif /* CONFIG_83XX_GENERIC_PCIE_REGISTER_HOSES */ +int get_pcie_clk(int index) +{ + volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR; + u32 pci_sync_in; + u8 spmf; + u8 clkin_div; + u32 sccr; + u32 csb_clk; + u32 testval; + + clkin_div = ((im->clk.spmr & SPMR_CKID) >> SPMR_CKID_SHIFT); + sccr = im->clk.sccr; + pci_sync_in = CONFIG_SYS_CLK_FREQ / (1 + clkin_div); + spmf = (im->clk.spmr & SPMR_SPMF) >> SPMR_SPMF_SHIFT; + csb_clk = pci_sync_in * (1 + clkin_div) * spmf; + + if (index) + testval = (sccr & SCCR_PCIEXP2CM) >> SCCR_PCIEXP2CM_SHIFT; + else + testval = (sccr & SCCR_PCIEXP1CM) >> SCCR_PCIEXP1CM_SHIFT; + + switch (testval) { + case 0: + return 0; + case 1: + return csb_clk; + case 2: + return csb_clk / 2; + case 3: + return csb_clk / 3; + } + + return 0; +} + static void mpc83xx_pcie_init_bus(int bus, struct pci_region *reg) { immap_t *immr = (immap_t *)CONFIG_SYS_IMMR; @@ -269,11 +304,9 @@ static void mpc83xx_pcie_init_bus(int bus, struct pci_region *reg) /* Hose configure header is memory-mapped */ hose_cfg_base = (void *)pex; - get_clocks(); /* Configure the PCIE controller core clock ratio */ out_le32(hose_cfg_base + PEX_GCLK_RATIO, - (((bus ? gd->arch.pciexp2_clk : gd->arch.pciexp1_clk) - / 1000000) * 16) / 333); + ((get_pcie_clk(bus) / 1000000) * 16) / 333); udelay(1000000); /* Do Type 1 bridge configuration */ |