@@ -9,6 +9,7 @@
#include <linux/align.h>
#include <linux/bitfield.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/platform_device.h>
#include "pcie-designware.h"
@@ -294,7 +295,7 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
atu.func_no = func_no;
atu.type = PCIE_ATU_TYPE_MEM;
- atu.cpu_addr = addr;
+ atu.cpu_addr = addr - ep->phys_base + ep->bus_addr_base;
atu.pci_addr = pci_addr;
atu.size = size;
ret = dw_pcie_ep_outbound_atu(ep, &atu);
@@ -861,6 +862,7 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
struct device_node *np = dev->of_node;
+ int index;
INIT_LIST_HEAD(&ep->func_list);
@@ -873,6 +875,23 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
return -EINVAL;
ep->phys_base = res->start;
+ ep->bus_addr_base = ep->phys_base;
+
+ if (pci->using_dtbus_info) {
+ index = of_property_match_string(np, "reg-names", "addr_space");
+ if (index < 0)
+ return -EINVAL;
+
+ /*
+ * Retrieve the local bus address information, which is sent to
+ * the PCIe Endpoint (EP) controller. If the parent bus
+ * 'ranges' in the device tree provide the correct address
+ * conversion information, set 'using_dtbus_info' to true. This
+ * allows 'cpu_addr_fixup()' to be eliminated.
+ */
+ of_property_read_reg(np, index, &ep->bus_addr_base, NULL);
+ }
+
ep->addr_size = resource_size(res);
if (ep->ops->pre_init)
@@ -410,6 +410,7 @@ struct dw_pcie_ep {
struct list_head func_list;
const struct dw_pcie_ep_ops *ops;
phys_addr_t phys_base;
+ u64 bus_addr_base;
size_t addr_size;
size_t page_size;
u8 bar_to_atu[PCI_STD_NUM_BARS];
Endpoint ┌───────────────────────────────────────────────┐ │ pcie-ep@5f010000 │ │ ┌────────────────┐│ │ │ Endpoint ││ │ │ PCIe ││ │ │ Controller ││ │ bus@5f000000 │ ││ │ ┌──────────┐ │ ││ │ │ │ Outbound Transfer ││ │┌─────┐ │ Bus ┼─────►│ ATU ──────────┬┬─────► ││ │ │ Fabric │Bus │ ││PCI Addr ││ CPU ├───►│ │Addr │ ││0xA000_0000 ││ │CPU │ │0x8000_0000 ││ │└─────┘Addr└──────────┘ │ ││ │ 0x7000_0000 └────────────────┘│ └───────────────────────────────────────────────┘ Add 'bus_addr_base' to configure the outbound window address for CPU write. The bus fabric generally passes the same address to the PCIe EP controller, but some bus fabrics convert the address before sending it to the PCIe EP controller. Above diagram, CPU write data to outbound windows address 0x7000_0000, Bus fabric convert it to 0x8000_0000. ATU should use bus address 0x8000_0000 as input address and convert to PCI address 0xA000_0000. Previously, 'cpu_addr_fixup()' was used to handle address conversion. Now, the device tree provides this information, preferring a common method. bus@5f000000 { compatible = "simple-bus"; ranges = <0x80000000 0x0 0x70000000 0x10000000>; pcie-ep@5f010000 { reg = <0x80000000 0x10000000>; reg-names ="addr_space"; ... }; ... }; 'ranges' in bus@5f000000 descript how address convert from CPU address to bus address. Use `of_property_read_reg()` to obtain the bus address and set it to the ATU correctly, eliminating the need for vendor-specific cpu_addr_fixup(). Add 'using_dtbus_info' to indicate device tree reflect correctly bus address translation in case break compatibility. Signed-off-by: Frank Li <Frank.Li@nxp.com> --- Change from v5 to v6 - update diagram - Add comments for of_property_read_reg() - Remove unrelated 0x5f00_0000 in commit message Change from v3 to v4 - change bus_addr_base to u64 to fix 32bit build error | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202410230328.BTHareG1-lkp@intel.com/ Change from v2 to v3 - Add using_dtbus_info to control if use device tree bus ranges information. --- drivers/pci/controller/dwc/pcie-designware-ep.c | 21 ++++++++++++++++++++- drivers/pci/controller/dwc/pcie-designware.h | 1 + 2 files changed, 21 insertions(+), 1 deletion(-)