From: Stuart Yoder stuart.yoder@nxp.com
msi-map properties are used to tell an OS how PCI requester IDs are mapped to ARM SMMU stream IDs. This patch defines a function to append a single msi-map entry to a given PCI controller device tree node.
Signed-off-by: Stuart Yoder stuart.yoder@nxp.com --- -v5: no change
drivers/pci/pcie_layerscape.c | 42 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c index f3bf689..73af423 100644 --- a/drivers/pci/pcie_layerscape.c +++ b/drivers/pci/pcie_layerscape.c @@ -520,6 +520,48 @@ static u32 ls_pcie_next_streamid(void)
return next_stream_id++; } + +/* + * An msi-map is a property to be added to the pci controller + * node. It is a table, where each entry consists of 4 fields + * e.g.: + * + * msi-map = <[devid] [phandle-to-msi-ctrl] [stream-id] [count] + * [devid] [phandle-to-msi-ctrl] [stream-id] [count]>; + */ +static void fdt_pcie_set_msi_map_entry(void *blob, struct ls_pcie *pcie, + u32 devid, u32 streamid) +{ + char pcie_path[19]; + u32 *prop; + u32 phandle; + int nodeoffset; + + /* find pci controller node */ + snprintf(pcie_path, sizeof(pcie_path), "/soc/pcie@%llx", + (u64)pcie->dbi); + nodeoffset = fdt_path_offset(blob, pcie_path); + if (nodeoffset < 0) { + printf("\n%s: ERROR: unable to update PCIe node: %s\n", + __func__, pcie_path); + return; + } + + /* get phandle to MSI controller */ + prop = (u32 *)fdt_getprop(blob, nodeoffset, "msi-parent", 0); + if (prop == NULL) { + printf("\n%s: ERROR: missing msi-parent: %s\n", __func__, + pcie_path); + return; + } + phandle = be32_to_cpu(*prop); + + /* set one msi-map row */ + fdt_appendprop_u32(blob, nodeoffset, "msi-map", devid); + fdt_appendprop_u32(blob, nodeoffset, "msi-map", phandle); + fdt_appendprop_u32(blob, nodeoffset, "msi-map", streamid); + fdt_appendprop_u32(blob, nodeoffset, "msi-map", 1); +} #endif
int ls_pcie_init_ctrl(int busno, enum srds_prtcl dev, struct ls_pcie_info *info)