diff options
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.c | 40 | ||||
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware.h | 13 |
2 files changed, 52 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 27b464a405a4..4b442d1aa55b 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -1114,7 +1114,8 @@ resource_size_t dw_pcie_parent_bus_offset(struct dw_pcie *pci, struct device *dev = pci->dev; struct device_node *np = dev->of_node; int index; - u64 reg_addr; + u64 reg_addr, fixup_addr; + u64 (*fixup)(struct dw_pcie *pcie, u64 cpu_addr); /* Look up reg_name address on parent bus */ index = of_property_match_string(np, "reg-names", reg_name); @@ -1126,5 +1127,42 @@ resource_size_t dw_pcie_parent_bus_offset(struct dw_pcie *pci, of_property_read_reg(np, index, ®_addr, NULL); + fixup = pci->ops ? pci->ops->cpu_addr_fixup : NULL; + if (fixup) { + fixup_addr = fixup(pci, cpu_phys_addr); + if (reg_addr == fixup_addr) { + dev_info(dev, "%s reg[%d] %#010llx == %#010llx == fixup(cpu %#010llx); %ps is redundant with this devicetree\n", + reg_name, index, reg_addr, fixup_addr, + (unsigned long long) cpu_phys_addr, fixup); + } else { + dev_warn(dev, "%s reg[%d] %#010llx != %#010llx == fixup(cpu %#010llx); devicetree is broken\n", + reg_name, index, reg_addr, fixup_addr, + (unsigned long long) cpu_phys_addr); + reg_addr = fixup_addr; + } + + return cpu_phys_addr - reg_addr; + } + + if (pci->use_parent_dt_ranges) { + + /* + * This platform once had a fixup, presumably because it + * translates between CPU and PCI controller addresses. + * Log a note if devicetree didn't describe a translation. + */ + if (reg_addr == cpu_phys_addr) + dev_info(dev, "%s reg[%d] %#010llx == cpu %#010llx\n; no fixup was ever needed for this devicetree\n", + reg_name, index, reg_addr, + (unsigned long long) cpu_phys_addr); + } else { + if (reg_addr != cpu_phys_addr) { + dev_warn(dev, "%s reg[%d] %#010llx != cpu %#010llx; no fixup and devicetree \"ranges\" is broken, assuming no translation\n", + reg_name, index, reg_addr, + (unsigned long long) cpu_phys_addr); + return 0; + } + } + return cpu_phys_addr - reg_addr; } diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 16548b01347d..f08d2852cfd5 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -465,6 +465,19 @@ struct dw_pcie { struct reset_control_bulk_data core_rsts[DW_PCIE_NUM_CORE_RSTS]; struct gpio_desc *pe_rst; bool suspended; + + /* + * If iATU input addresses are offset from CPU physical addresses, + * we previously required .cpu_addr_fixup() to convert them. We + * now rely on the devicetree instead. If .cpu_addr_fixup() + * exists, we compare its results with devicetree. + * + * If .cpu_addr_fixup() does not exist, we assume the offset is + * zero and warn if devicetree claims otherwise. If we know all + * devicetrees correctly describe the offset, set + * use_parent_dt_ranges to true to avoid this warning. + */ + bool use_parent_dt_ranges; }; #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp) |