From 78be6222b01efa12d9267876ad1d1d0daf38dfa0 Mon Sep 17 00:00:00 2001
From: Bharat Bhushan <bharat.bhushan@nxp.com>
Date: Wed, 22 Mar 2017 12:12:33 +0530
Subject: [PATCH] pcie-layerscape: Fixup iommu-map property of pci node
This patch fixup iommu-map property on pci node to have a valid
mapping of requester-id to stream-id. The requester-id to stream-id
mapping is based on PCI-LUT table initialization.
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
---
drivers/pci/pcie_layerscape_fixup.c | 55 +++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/drivers/pci/pcie_layerscape_fixup.c b/drivers/pci/pcie_layerscape_fixup.c
index d7591bcff0..d504bbda37 100644
--- a/drivers/pci/pcie_layerscape_fixup.c
+++ b/drivers/pci/pcie_layerscape_fixup.c
@@ -110,6 +110,58 @@ static void fdt_pcie_set_msi_map_entry(void *blob, struct ls_pcie *pcie,
fdt_appendprop_u32(blob, nodeoffset, "msi-map", 1);
}
+/*
+ * An iommu-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.:
+ *
+ * iommu-map = <[devid] [phandle-to-iommu-ctrl] [stream-id] [count]
+ * [devid] [phandle-to-iommu-ctrl] [stream-id] [count]>;
+ */
+static void fdt_pcie_set_iommu_map_entry(void *blob, struct ls_pcie *pcie,
+ u32 devid, u32 streamid)
+{
+ u32 *prop;
+ u32 iommu_map[4];
+ int nodeoffset;
+ int lenp;
+
+ /* find pci controller node */
+ nodeoffset = fdt_node_offset_by_compat_reg(blob, "fsl,ls-pcie",
+ pcie->dbi_res.start);
+ if (nodeoffset < 0) {
+#ifdef CONFIG_FSL_PCIE_COMPAT /* Compatible with older version of dts node */
+ nodeoffset = fdt_node_offset_by_compat_reg(blob,
+ CONFIG_FSL_PCIE_COMPAT, pcie->dbi_res.start);
+ if (nodeoffset < 0)
+ return;
+#else
+ return;
+#endif
+ }
+
+ /* get phandle to iommu controller */
+ prop = fdt_getprop_w(blob, nodeoffset, "iommu-map", &lenp);
+ if (prop == NULL) {
+ debug("\n%s: ERROR: missing iommu-map: PCIe%d\n",
+ __func__, pcie->idx);
+ return;
+ }
+
+ /* set iommu-map row */
+ iommu_map[0] = cpu_to_fdt32(devid);
+ iommu_map[1] = *++prop;
+ iommu_map[2] = cpu_to_fdt32(streamid);
+ iommu_map[3] = cpu_to_fdt32(1);
+
+ if (devid == 0) {
+ fdt_setprop_inplace(blob, nodeoffset, "iommu-map",
+ iommu_map, 16);
+ } else {
+ fdt_appendprop(blob, nodeoffset, "iommu-map", iommu_map, 16);
+ }
+}
+
static void fdt_fixup_pcie(void *blob)
{
struct udevice *dev, *bus;
@@ -146,6 +198,9 @@ static void fdt_fixup_pcie(void *blob)
/* update msi-map in device tree */
fdt_pcie_set_msi_map_entry(blob, pcie, bdf >> 8,
streamid);
+ /* update iommu-map in device tree */
+ fdt_pcie_set_iommu_map_entry(blob, pcie, bdf >> 8,
+ streamid);
}
}
#endif
--
2.39.5