[U-Boot] [PATCH v2 32/58] mpc83xx: pcie: Read the clock from registers

[Mario Six]

The MPC83xx DM timer driver disables arch.pciexp*_clk, and uses
clk_get_rate instead. But the legacy MPC83xx PCIe driver still uses
arch.pciexp*_clk for the clock.

Hence, read the PCIe clock from the registers in the legacy MPC83xx PCIe
driver.

Signed-off-by: Mario Six <mario....@gdsys.cc>

---

v1 -> v2:
No changes

---
 arch/powerpc/cpu/mpc83xx/pcie.c | 39 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/cpu/mpc83xx/pcie.c b/arch/powerpc/cpu/mpc83xx/pcie.c
index c250150224d..2608447d80d 100644
--- a/arch/powerpc/cpu/mpc83xx/pcie.c
+++ b/arch/powerpc/cpu/mpc83xx/pcie.c
@@ -176,6 +176,41 @@ 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;
@@ -271,11 +306,9 @@ 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 */
-- 
2.11.0

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