[U-Boot] [PATCH 6/7 v4] pci/layerscape: fdt: function to set msi-map entries

[Stuart Yoder]

From: Stuart Yoder <stuart.yoder at 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 at nxp.com>
---
-v4: no changes

 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 4d24436..c3dc911 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)
-- 
1.7.9.5