PCI: dwc: Make cpu_addr_fixup take struct dw_pcie as argument
The current cpu addr fixup mask for ARTPEC-6, GENMASK(27, 0), is wrong.
The correct cpu addr fixup mask for ARTPEC-6 is GENMASK(28, 0).
However, having a hardcoded cpu addr fixup mask in each driver is
arguably wrong.
A device tree property called something like "cpu-addr-fixup-mask"
would have been a better solution.
Introducing such a property is not needed though, since we already have
pp->cfg0_base and ep->phys_base, which is derived from already existing
device tree properties.
It is also worth noting that for ARTPEC-7, hardcoding the cpu addr fixup
mask is not possible, since it uses a High Address Bits Look Up Table,
which means that it can, at runtime, map the PCIe window to an arbitrary
address in the 32-bit address space.
By using pp->cfg0_base and ep->phys_base, we avoid hardcoding a mask
in each driver. This should work for ARTPEC-6, DRA7xx, and ARTPEC-7.
I have not changed the code in DRA7xx though, since their existing
code works, but if they want, they could use the same logic as
artpec6_pcie_cpu_addr_fixup, and thus remove their hardcoded mask.
The reason why the fixup mask is needed is explained in commit f4c55c5a3f7f
("PCI: designware: Program ATU with untranslated address").
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index 24edac0..cca5a81 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -205,7 +205,7 @@ struct dw_pcie_ep {
};
struct dw_pcie_ops {
- u64 (*cpu_addr_fixup)(u64 cpu_addr);
+ u64 (*cpu_addr_fixup)(struct dw_pcie *pcie, u64 cpu_addr);
u32 (*read_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
size_t size);
void (*write_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,