openwrt/target/linux/mediatek/patches-6.1/942-net-ethernet-mtk_wed-move-cpuboot-in-a-dedicated-dts.patch

From f292d1bf83ec160bef2532b58aa08f5b71041923 Mon Sep 17 00:00:00 2001
Message-Id: <f292d1bf83ec160bef2532b58aa08f5b71041923.1678716918.git.lorenzo@kernel.org>
In-Reply-To: <3cf212c4ce6cd72c09bc47f35f539ba0afd4d106.1678716918.git.lorenzo@kernel.org>
References: <3cf212c4ce6cd72c09bc47f35f539ba0afd4d106.1678716918.git.lorenzo@kernel.org>
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Sat, 11 Mar 2023 18:13:04 +0100
Subject: [PATCH net-next 2/2] net: ethernet: mtk_wed: move cpuboot in a
 dedicated dts node

Since the cpuboot memory region is not part of the RAM SoC, move cpuboot
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 cpuboot was
defined as reserved-memory child node.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/ethernet/mediatek/mtk_wed_mcu.c | 34 +++++++++++++++++----
 drivers/net/ethernet/mediatek/mtk_wed_wo.h  |  3 +-
 2 files changed, 30 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
@@ -18,12 +18,23 @@
 
 static u32 wo_r32(struct mtk_wed_wo *wo, u32 reg)
 {
-	return readl(wo->boot.addr + reg);
+	u32 val;
+
+	if (!wo->boot_regmap)
+		return readl(wo->boot.addr + reg);
+
+	if (regmap_read(wo->boot_regmap, reg, &val))
+		val = ~0;
+
+	return val;
 }
 
 static void wo_w32(struct mtk_wed_wo *wo, u32 reg, u32 val)
 {
-	writel(val, wo->boot.addr + reg);
+	if (wo->boot_regmap)
+		regmap_write(wo->boot_regmap, reg, val);
+	else
+		writel(val, wo->boot.addr + reg);
 }
 
 static struct sk_buff *
@@ -316,10 +327,21 @@ mtk_wed_mcu_load_firmware(struct mtk_wed
 			return ret;
 	}
 
-	wo->boot.name = "wo-boot";
-	ret = mtk_wed_get_reserved_memory_region(wo, &wo->boot);
-	if (ret)
-		return ret;
+	wo->boot_regmap = syscon_regmap_lookup_by_phandle(wo->hw->node,
+							  "mediatek,wo-cpuboot");
+	if (IS_ERR(wo->boot_regmap)) {
+		if (wo->boot_regmap != ERR_PTR(-ENODEV))
+			return PTR_ERR(wo->boot_regmap);
+
+		/* For backward compatibility, we need to check if cpu_boot
+		 * is defined through reserved memory property.
+		 */
+		wo->boot_regmap = NULL;
+		wo->boot.name = "wo-boot";
+		ret = mtk_wed_get_reserved_memory_region(wo, &wo->boot);
+		if (ret)
+			return ret;
+	}
 
 	/* set dummy cr */
 	wed_w32(wo->hw->wed_dev, MTK_WED_SCR0 + 4 * MTK_WED_DUMMY_CR_FWDL,
--- a/drivers/net/ethernet/mediatek/mtk_wed_wo.h
+++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.h
@@ -228,7 +228,8 @@ struct mtk_wed_wo_queue {
 
 struct mtk_wed_wo {
 	struct mtk_wed_hw *hw;
-	struct mtk_wed_wo_memory_region boot;
+	struct mtk_wed_wo_memory_region boot; /* backward compatibility */
+	struct regmap *boot_regmap;
 
 	struct mtk_wed_wo_queue q_tx;
 	struct mtk_wed_wo_queue q_rx;