linux-kernel - [PATCH RFC 3/4] phy: hisi-inno-usb2: add support for direct MMIO

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Message-Id: <20240216-inno-phy-v1-3-1ab912f0533f@outlook.com>
Date: Fri, 16 Feb 2024 23:21:03 +0800
From: Yang Xiwen via B4 Relay <devnull+forbidden405.outlook.com@...nel.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Jiancheng Xue <xuejiancheng@...ilicon.com>, 
 Pengcheng Li <lpc.li@...ilicon.com>, Shawn Guo <shawn.guo@...aro.org>
Cc: linux-phy@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Kishon Vijay Abraham I <kishon@...com>, 
 David Yang <mmyangfl@...il.com>, Yang Xiwen <forbidden405@...look.com>
Subject: [PATCH RFC 3/4] phy: hisi-inno-usb2: add support for direct MMIO

From: Yang Xiwen <forbidden405@...look.com>

This method of resgiter access is used by Hi3798MV200. For other models,
of_iomap() returns 0 due to insufficient length. So they are unaffected.

Signed-off-by: Yang Xiwen <forbidden405@...look.com>
---
 drivers/phy/hisilicon/phy-hisi-inno-usb2.c | 53 +++++++++++++++++++-----------
 1 file changed, 33 insertions(+), 20 deletions(-)

diff --git a/drivers/phy/hisilicon/phy-hisi-inno-usb2.c b/drivers/phy/hisilicon/phy-hisi-inno-usb2.c
index b7e740eb4752..12a158fb749c 100644
--- a/drivers/phy/hisilicon/phy-hisi-inno-usb2.c
+++ b/drivers/phy/hisilicon/phy-hisi-inno-usb2.c
@@ -10,6 +10,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
@@ -43,6 +44,7 @@
 #define PHY_CLK_ENABLE		BIT(2)
 
 struct hisi_inno_phy_port {
+	void __iomem *base;
 	struct reset_control *utmi_rst;
 	struct hisi_inno_phy_priv *priv;
 };
@@ -62,26 +64,31 @@ static void hisi_inno_phy_write_reg(struct hisi_inno_phy_priv *priv,
 	u32 val;
 	u32 value;
 
-	if (priv->type == PHY_TYPE_0)
-		val = (data & PHY_TEST_DATA) |
-		      ((addr << PHY_TEST_ADDR_OFFSET) & PHY0_TEST_ADDR) |
-		      ((port << PHY0_TEST_PORT_OFFSET) & PHY0_TEST_PORT) |
-		      PHY0_TEST_WREN | PHY0_TEST_RST;
-	else
-		val = (data & PHY_TEST_DATA) |
-		      ((addr << PHY_TEST_ADDR_OFFSET) & PHY1_TEST_ADDR) |
-		      ((port << PHY1_TEST_PORT_OFFSET) & PHY1_TEST_PORT) |
-		      PHY1_TEST_WREN | PHY1_TEST_RST;
-	writel(val, reg);
-
-	value = val;
-	if (priv->type == PHY_TYPE_0)
-		value |= PHY0_TEST_CLK;
-	else
-		value |= PHY1_TEST_CLK;
-	writel(value, reg);
-
-	writel(val, reg);
+	if (priv->ports[port].base)
+		// stride is 4
+		writel(data, (u32 *)priv->ports[port].base + addr);
+	else {
+		if (priv->type == PHY_TYPE_0)
+			val = (data & PHY_TEST_DATA) |
+			      ((addr << PHY_TEST_ADDR_OFFSET) & PHY0_TEST_ADDR) |
+			      ((port << PHY0_TEST_PORT_OFFSET) & PHY0_TEST_PORT) |
+			      PHY0_TEST_WREN | PHY0_TEST_RST;
+		else
+			val = (data & PHY_TEST_DATA) |
+			      ((addr << PHY_TEST_ADDR_OFFSET) & PHY1_TEST_ADDR) |
+			      ((port << PHY1_TEST_PORT_OFFSET) & PHY1_TEST_PORT) |
+			      PHY1_TEST_WREN | PHY1_TEST_RST;
+		writel(val, reg);
+
+		value = val;
+		if (priv->type == PHY_TYPE_0)
+			value |= PHY0_TEST_CLK;
+		else
+			value |= PHY1_TEST_CLK;
+		writel(value, reg);
+
+		writel(val, reg);
+	}
 }
 
 static void hisi_inno_phy_setup(struct hisi_inno_phy_priv *priv)
@@ -167,6 +174,7 @@ static int hisi_inno_phy_probe(struct platform_device *pdev)
 	for_each_child_of_node(np, child) {
 		struct reset_control *rst;
 		struct phy *phy;
+		void __iomem *base;
 
 		rst = of_reset_control_get_exclusive(child, NULL);
 		if (IS_ERR(rst)) {
@@ -174,7 +182,10 @@ static int hisi_inno_phy_probe(struct platform_device *pdev)
 			return PTR_ERR(rst);
 		}
 
+		base = of_iomap(child, 0);
+
 		priv->ports[i].utmi_rst = rst;
+		priv->ports[i].base = base;
 		priv->ports[i].priv = priv;
 
 		phy = devm_phy_create(dev, child, &hisi_inno_phy_ops);
@@ -205,6 +216,8 @@ static const struct of_device_id hisi_inno_phy_of_match[] = {
 	  .data = (void *) PHY_TYPE_0 },
 	{ .compatible = "hisilicon,hi3798mv100-usb2-phy",
 	  .data = (void *) PHY_TYPE_1 },
+	{ .compatible = "hisilicon,hi3798mv200-usb2-phy",
+	  .data = (void *) PHY_TYPE_0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, hisi_inno_phy_of_match);

-- 
2.43.0