On Sat, Mar 15, 2025 at 03:15:40PM -0500, Bjorn Helgaas wrote: > From: Frank Li <Frank.Li@xxxxxxx> > > Return the offset from CPU physical address to the parent bus address of > the specified element of the devicetree 'reg' property. > > [bhelgaas: return offset, split .cpu_addr_fixup() checking and debug to > separate patch] > Link: https://lore.kernel.org/r/20250313-pci_fixup_addr-v11-5-01d2313502ab@xxxxxxx > Signed-off-by: Frank Li <Frank.Li@xxxxxxx> > Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > --- look good! > drivers/pci/controller/dwc/pcie-designware.c | 23 ++++++++++++++++++++ > drivers/pci/controller/dwc/pcie-designware.h | 3 +++ > 2 files changed, 26 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > index 9d0a5f75effc..0a35e36da703 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.c > +++ b/drivers/pci/controller/dwc/pcie-designware.c > @@ -16,6 +16,7 @@ > #include <linux/gpio/consumer.h> > #include <linux/ioport.h> > #include <linux/of.h> > +#include <linux/of_address.h> > #include <linux/platform_device.h> > #include <linux/sizes.h> > #include <linux/types.h> > @@ -1105,3 +1106,25 @@ void dw_pcie_setup(struct dw_pcie *pci) > > dw_pcie_link_set_max_link_width(pci, pci->num_lanes); > } > + > +resource_size_t dw_pcie_parent_bus_offset(struct dw_pcie *pci, > + const char *reg_name, > + resource_size_t cpu_phy_addr) > +{ > + struct device *dev = pci->dev; > + struct device_node *np = dev->of_node; > + int index; > + u64 reg_addr; > + > + /* Look up reg_name address on parent bus */ > + index = of_property_match_string(np, "reg-names", reg_name); > + > + if (index < 0) { > + dev_err(dev, "No %s in devicetree \"reg\" property\n", reg_name); > + return 0; > + } > + > + of_property_read_reg(np, index, ®_addr, NULL); > + > + return cpu_phy_addr - reg_addr; > +} > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index d0d8c622a6e8..16548b01347d 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -500,6 +500,9 @@ void dw_pcie_setup(struct dw_pcie *pci); > void dw_pcie_iatu_detect(struct dw_pcie *pci); > int dw_pcie_edma_detect(struct dw_pcie *pci); > void dw_pcie_edma_remove(struct dw_pcie *pci); > +resource_size_t dw_pcie_parent_bus_offset(struct dw_pcie *pci, > + const char *reg_name, > + resource_size_t cpu_phy_addr); > > static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val) > { > -- > 2.34.1 >
