openwrt/target/linux/mediatek/patches-6.6/943-net-ethernet-mtk_wed-move-ilm-a-dedicated-dts-node.patch

From f3565e6c2276411275e707a5442d3f69cc111273 Mon Sep 17 00:00:00 2001
Message-Id: <f3565e6c2276411275e707a5442d3f69cc111273.1678718888.git.lorenzo@kernel.org>
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Sun, 12 Mar 2023 18:51:47 +0100
Subject: [PATCH net-next 1/3] net: ethernet: mtk_wed: move ilm a dedicated dts
 node

Since the ilm memory region is not part of the RAM SoC, move ilm in a
deidicated syscon node.
This patch helps to keep backward-compatibility with older version of
uboot codebase where we have a limit of 8 reserved-memory dts child
nodes.
Keep backward-compatibility with older dts version where ilm was defined
as reserved-memory child node.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/ethernet/mediatek/mtk_wed_mcu.c | 55 ++++++++++++++++++---
 1 file changed, 49 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
@@ -320,6 +320,39 @@ next:
 }
 
 static int
+mtk_wed_mcu_load_ilm(struct mtk_wed_wo *wo)
+{
+	struct mtk_wed_wo_memory_region *ilm_region;
+	struct resource res;
+	struct device_node *np;
+	int ret;
+
+	np = of_parse_phandle(wo->hw->node, "mediatek,wo-ilm", 0);
+	if (!np)
+		return 0;
+
+	ret = of_address_to_resource(np, 0, &res);
+	of_node_put(np);
+
+	if (ret < 0)
+		return ret;
+
+	ilm_region = &mem_region[MTK_WED_WO_REGION_ILM];
+	ilm_region->phy_addr = res.start;
+	ilm_region->size = resource_size(&res);
+	ilm_region->addr = devm_ioremap(wo->hw->dev, res.start,
+					resource_size(&res));
+
+	if (!IS_ERR(ilm_region->addr))
+		return 0;
+
+	ret = PTR_ERR(ilm_region->addr);
+	ilm_region->addr = NULL;
+
+	return ret;
+}
+
+static int
 mtk_wed_mcu_load_firmware(struct mtk_wed_wo *wo)
 {
 	const struct mtk_wed_fw_trailer *trailer;
@@ -328,14 +361,20 @@ mtk_wed_mcu_load_firmware(struct mtk_wed
 	u32 val, boot_cr;
 	int ret, i;
 
+	mtk_wed_mcu_load_ilm(wo);
 	wo->boot_regmap = syscon_regmap_lookup_by_phandle(wo->hw->node,
 							  "mediatek,wo-cpuboot");
 
 	/* load firmware region metadata */
 	for (i = 0; i < ARRAY_SIZE(mem_region); i++) {
-		int index = of_property_match_string(wo->hw->node,
-						     "memory-region-names",
-						     mem_region[i].name);
+		int index;
+
+		if (mem_region[i].addr)
+			continue;
+
+		index = of_property_match_string(wo->hw->node,
+						 "memory-region-names",
+						 mem_region[i].name);
 		if (index < 0)
 			continue;