[U-Boot] [RESEND PATCH 6/7 v5] pci/layerscape: fdt: function to set msi-map entries

Stuart Yoder
2016-03-09T16:03:27Z

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);