phy: uniphier-pcie: Add legacy SoC support for Pro5

Add legacy SoC support that needs to manage gio clock and reset and to skip
setting unimplemented phy parameters. This supports Pro5.

This specifies only 1 port use because Pro5 doesn't set it in the power-on
sequence.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/socionext/phy-uniphier-pcie.c

@@ -19,6 +19,10 @@
 #include <linux/resource.h>
 
 /* PHY */
+#define PCL_PHY_CLKCTRL		0x0000
+#define PORT_SEL_MASK		GENMASK(11, 9)
+#define PORT_SEL_1		FIELD_PREP(PORT_SEL_MASK, 1)
+
 #define PCL_PHY_TEST_I		0x2000
 #define PCL_PHY_TEST_O		0x2004
 #define TESTI_DAT_MASK		GENMASK(13, 6)
@@ -45,13 +49,14 @@
 struct uniphier_pciephy_priv {
 	void __iomem *base;
 	struct device *dev;
-	struct clk *clk;
-	struct reset_control *rst;
+	struct clk *clk, *clk_gio;
+	struct reset_control *rst, *rst_gio;
 	const struct uniphier_pciephy_soc_data *data;
 };
 
 struct uniphier_pciephy_soc_data {
 	bool has_syscon;
+	bool is_legacy;
 };
 
 static void uniphier_pciephy_testio_write(struct uniphier_pciephy_priv *priv,
@@ -111,16 +116,35 @@ static void uniphier_pciephy_deassert(struct uniphier_pciephy_priv *priv)
 static int uniphier_pciephy_init(struct phy *phy)
 {
 	struct uniphier_pciephy_priv *priv = phy_get_drvdata(phy);
+	u32 val;
 	int ret;
 
 	ret = clk_prepare_enable(priv->clk);
 	if (ret)
 		return ret;
 
-	ret = reset_control_deassert(priv->rst);
+	ret = clk_prepare_enable(priv->clk_gio);
 	if (ret)
 		goto out_clk_disable;
 
+	ret = reset_control_deassert(priv->rst);
+	if (ret)
+		goto out_clk_gio_disable;
+
+	ret = reset_control_deassert(priv->rst_gio);
+	if (ret)
+		goto out_rst_assert;
+
+	/* support only 1 port */
+	val = readl(priv->base + PCL_PHY_CLKCTRL);
+	val &= ~PORT_SEL_MASK;
+	val |= PORT_SEL_1;
+	writel(val, priv->base + PCL_PHY_CLKCTRL);
+
+	/* legacy controller doesn't have phy_reset and parameters */
+	if (priv->data->is_legacy)
+		return 0;
+
 	uniphier_pciephy_set_param(priv, PCL_PHY_R00,
 				   RX_EQ_ADJ_EN, RX_EQ_ADJ_EN);
 	uniphier_pciephy_set_param(priv, PCL_PHY_R06, RX_EQ_ADJ,
@@ -134,6 +158,10 @@ static int uniphier_pciephy_init(struct phy *phy)
 
 	return 0;
 
+out_rst_assert:
+	reset_control_assert(priv->rst);
+out_clk_gio_disable:
+	clk_disable_unprepare(priv->clk_gio);
 out_clk_disable:
 	clk_disable_unprepare(priv->clk);
 
@@ -144,8 +172,11 @@ static int uniphier_pciephy_exit(struct phy *phy)
 {
 	struct uniphier_pciephy_priv *priv = phy_get_drvdata(phy);
 
+	if (!priv->data->is_legacy)
 		uniphier_pciephy_assert(priv);
+	reset_control_assert(priv->rst_gio);
 	reset_control_assert(priv->rst);
+	clk_disable_unprepare(priv->clk_gio);
 	clk_disable_unprepare(priv->clk);
 
 	return 0;
@@ -179,6 +210,24 @@ static int uniphier_pciephy_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
+	if (priv->data->is_legacy) {
+		priv->clk_gio = devm_clk_get(dev, "gio");
+		if (IS_ERR(priv->clk_gio))
+			return PTR_ERR(priv->clk_gio);
+
+		priv->rst_gio =
+			devm_reset_control_get_shared(dev, "gio");
+		if (IS_ERR(priv->rst_gio))
+			return PTR_ERR(priv->rst_gio);
+
+		priv->clk = devm_clk_get(dev, "link");
+		if (IS_ERR(priv->clk))
+			return PTR_ERR(priv->clk);
+
+		priv->rst = devm_reset_control_get_shared(dev, "link");
+		if (IS_ERR(priv->rst))
+			return PTR_ERR(priv->rst);
+	} else {
 		priv->clk = devm_clk_get(dev, NULL);
 		if (IS_ERR(priv->clk))
 			return PTR_ERR(priv->clk);
@@ -186,6 +235,7 @@ static int uniphier_pciephy_probe(struct platform_device *pdev)
 		priv->rst = devm_reset_control_get_shared(dev, NULL);
 		if (IS_ERR(priv->rst))
 			return PTR_ERR(priv->rst);
+	}
 
 	phy = devm_phy_create(dev, dev->of_node, &uniphier_pciephy_ops);
 	if (IS_ERR(phy))
@@ -203,15 +253,26 @@ static int uniphier_pciephy_probe(struct platform_device *pdev)
 	return PTR_ERR_OR_ZERO(phy_provider);
 }
 
+static const struct uniphier_pciephy_soc_data uniphier_pro5_data = {
+	.has_syscon = false,
+	.is_legacy = true,
+};
+
 static const struct uniphier_pciephy_soc_data uniphier_ld20_data = {
 	.has_syscon = true,
+	.is_legacy = false,
 };
 
 static const struct uniphier_pciephy_soc_data uniphier_pxs3_data = {
 	.has_syscon = false,
+	.is_legacy = false,
 };
 
 static const struct of_device_id uniphier_pciephy_match[] = {
+	{
+		.compatible = "socionext,uniphier-pro5-pcie-phy",
+		.data = &uniphier_pro5_data,
+	},
 	{
 		.compatible = "socionext,uniphier-ld20-pcie-phy",
 		.data = &uniphier_ld20_data,