1 files changed, 265 insertions, 11 deletions

diff --git a/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c b/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
index a95572b397ca..e625b32889bf 100644
--- a/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
+++ b/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
@@ -4,17 +4,33 @@
  * Copyright 2019 Purism SPC
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
+#include <linux/firmware/imx/ipc.h>
+#include <linux/firmware/imx/svc/misc.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <dt-bindings/firmware/imx/rsrc.h>
+
+/* Control and Status Registers(CSR) */
+#define PHY_CTRL			0x00
+#define  CCM_MASK			GENMASK(7, 5)
+#define  CCM(n)				FIELD_PREP(CCM_MASK, (n))
+#define  CCM_1_2V			0x5
+#define  CA_MASK			GENMASK(4, 2)
+#define  CA_3_51MA			0x4
+#define  CA(n)				FIELD_PREP(CA_MASK, (n))
+#define  RFB				BIT(1)
+#define  LVDS_EN			BIT(0)
 
 /* DPHY registers */
 #define DPHY_PD_DPHY			0x00
@@ -55,8 +71,15 @@
 #define PWR_ON	0
 #define PWR_OFF	1
 
+#define MIN_VCO_FREQ 640000000
+#define MAX_VCO_FREQ 1500000000
+
+#define MIN_LVDS_REFCLK_FREQ 24000000
+#define MAX_LVDS_REFCLK_FREQ 150000000
+
 enum mixel_dphy_devtype {
 	MIXEL_IMX8MQ,
+	MIXEL_IMX8QXP,
 };
 
 struct mixel_dphy_devdata {
@@ -65,6 +88,7 @@ struct mixel_dphy_devdata {
 	u8 reg_rxlprp;
 	u8 reg_rxcdrp;
 	u8 reg_rxhs_settle;
+	bool is_combo;	/* MIPI DPHY and LVDS PHY combo */
 };
 
 static const struct mixel_dphy_devdata mixel_dphy_devdata[] = {
@@ -74,6 +98,10 @@ static const struct mixel_dphy_devdata mixel_dphy_devdata[] = {
 		.reg_rxlprp = 0x40,
 		.reg_rxcdrp = 0x44,
 		.reg_rxhs_settle = 0x48,
+		.is_combo = false,
+	},
+	[MIXEL_IMX8QXP] = {
+		.is_combo = true,
 	},
 };
 
@@ -95,8 +123,12 @@ struct mixel_dphy_cfg {
 struct mixel_dphy_priv {
 	struct mixel_dphy_cfg cfg;
 	struct regmap *regmap;
+	struct regmap *lvds_regmap;
 	struct clk *phy_ref_clk;
 	const struct mixel_dphy_devdata *devdata;
+	struct imx_sc_ipc *ipc_handle;
+	bool is_slave;
+	int id;
 };
 
 static const struct regmap_config mixel_dphy_regmap_config = {
@@ -317,7 +349,8 @@ static int mixel_dphy_set_pll_params(struct phy *phy)
 	return 0;
 }
 
-static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
+static int
+mixel_dphy_configure_mipi_dphy(struct phy *phy, union phy_configure_opts *opts)
 {
 	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
 	struct mixel_dphy_cfg cfg = { 0 };
@@ -345,15 +378,126 @@ static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
 	return 0;
 }
 
+static int
+mixel_dphy_configure_lvds_phy(struct phy *phy, union phy_configure_opts *opts)
+{
+	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
+	struct phy_configure_opts_lvds *lvds_opts = &opts->lvds;
+	unsigned long data_rate;
+	unsigned long fvco;
+	u32 rsc;
+	u32 co;
+	int ret;
+
+	priv->is_slave = lvds_opts->is_slave;
+
+	/* LVDS interface pins */
+	regmap_write(priv->lvds_regmap, PHY_CTRL,
+		     CCM(CCM_1_2V) | CA(CA_3_51MA) | RFB);
+
+	/* enable MODE8 only for slave LVDS PHY */
+	rsc = priv->id ? IMX_SC_R_MIPI_1 : IMX_SC_R_MIPI_0;
+	ret = imx_sc_misc_set_control(priv->ipc_handle, rsc, IMX_SC_C_DUAL_MODE,
+				      lvds_opts->is_slave);
+	if (ret) {
+		dev_err(&phy->dev, "Failed to configure MODE8: %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * Choose an appropriate divider ratio to meet the requirement of
+	 * PLL VCO frequency range.
+	 *
+	 *  -----  640MHz ~ 1500MHz   ------------      ---------------
+	 * | VCO | ----------------> | CO divider | -> | LVDS data rate|
+	 *  -----       FVCO          ------------      ---------------
+	 *                            1/2/4/8 div     7 * differential_clk_rate
+	 */
+	data_rate = 7 * lvds_opts->differential_clk_rate;
+	for (co = 1; co <= 8; co *= 2) {
+		fvco = data_rate * co;
+
+		if (fvco >= MIN_VCO_FREQ)
+			break;
+	}
+
+	if (fvco < MIN_VCO_FREQ || fvco > MAX_VCO_FREQ) {
+		dev_err(&phy->dev, "VCO frequency %lu is out of range\n", fvco);
+		return -ERANGE;
+	}
+
+	/*
+	 * CO is configurable, while CN and CM are not,
+	 * as fixed ratios 1 and 7 are applied respectively.
+	 */
+	phy_write(phy, __ffs(co), DPHY_CO);
+
+	/* set reference clock rate */
+	clk_set_rate(priv->phy_ref_clk, lvds_opts->differential_clk_rate);
+
+	return ret;
+}
+
+static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
+{
+	if (!opts) {
+		dev_err(&phy->dev, "No configuration options\n");
+		return -EINVAL;
+	}
+
+	if (phy->attrs.mode == PHY_MODE_MIPI_DPHY)
+		return mixel_dphy_configure_mipi_dphy(phy, opts);
+	else if (phy->attrs.mode == PHY_MODE_LVDS)
+		return mixel_dphy_configure_lvds_phy(phy, opts);
+
+	dev_err(&phy->dev,
+		"Failed to configure PHY with invalid PHY mode: %d\n", phy->attrs.mode);
+
+	return -EINVAL;
+}
+
+static int
+mixel_dphy_validate_lvds_phy(struct phy *phy, union phy_configure_opts *opts)
+{
+	struct phy_configure_opts_lvds *lvds_cfg = &opts->lvds;
+
+	if (lvds_cfg->bits_per_lane_and_dclk_cycle != 7) {
+		dev_err(&phy->dev, "Invalid bits per LVDS data lane: %u\n",
+			lvds_cfg->bits_per_lane_and_dclk_cycle);
+		return -EINVAL;
+	}
+
+	if (lvds_cfg->lanes != 4) {
+		dev_err(&phy->dev, "Invalid LVDS data lanes: %u\n", lvds_cfg->lanes);
+		return -EINVAL;
+	}
+
+	if (lvds_cfg->differential_clk_rate < MIN_LVDS_REFCLK_FREQ ||
+	    lvds_cfg->differential_clk_rate > MAX_LVDS_REFCLK_FREQ) {
+		dev_err(&phy->dev,
+			"Invalid LVDS differential clock rate: %lu\n",
+			lvds_cfg->differential_clk_rate);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int mixel_dphy_validate(struct phy *phy, enum phy_mode mode, int submode,
 			       union phy_configure_opts *opts)
 {
-	struct mixel_dphy_cfg cfg = { 0 };
+	if (mode == PHY_MODE_MIPI_DPHY) {
+		struct mixel_dphy_cfg mipi_dphy_cfg = { 0 };
 
-	if (mode != PHY_MODE_MIPI_DPHY)
-		return -EINVAL;
+		return mixel_dphy_config_from_opts(phy, &opts->mipi_dphy,
+						   &mipi_dphy_cfg);
+	} else if (mode == PHY_MODE_LVDS) {
+		return mixel_dphy_validate_lvds_phy(phy, opts);
+	}
 
-	return mixel_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg);
+	dev_err(&phy->dev,
+		"Failed to validate PHY with invalid PHY mode: %d\n", mode);
+	return -EINVAL;
 }
 
 static int mixel_dphy_init(struct phy *phy)
@@ -373,27 +517,75 @@ static int mixel_dphy_exit(struct phy *phy)
 	return 0;
 }
 
-static int mixel_dphy_power_on(struct phy *phy)
+static int mixel_dphy_power_on_mipi_dphy(struct phy *phy)
 {
 	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
 	u32 locked;
 	int ret;
 
-	ret = clk_prepare_enable(priv->phy_ref_clk);
-	if (ret < 0)
-		return ret;
-
 	phy_write(phy, PWR_ON, DPHY_PD_PLL);
 	ret = regmap_read_poll_timeout(priv->regmap, DPHY_LOCK, locked,
 				       locked, PLL_LOCK_SLEEP,
 				       PLL_LOCK_TIMEOUT);
 	if (ret < 0) {
 		dev_err(&phy->dev, "Could not get DPHY lock (%d)!\n", ret);
-		goto clock_disable;
+		return ret;
 	}
 	phy_write(phy, PWR_ON, DPHY_PD_DPHY);
 
 	return 0;
+}
+
+static int mixel_dphy_power_on_lvds_phy(struct phy *phy)
+{
+	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
+	u32 locked;
+	int ret;
+
+	regmap_update_bits(priv->lvds_regmap, PHY_CTRL, LVDS_EN, LVDS_EN);
+
+	phy_write(phy, PWR_ON, DPHY_PD_DPHY);
+	phy_write(phy, PWR_ON, DPHY_PD_PLL);
+
+	/* do not wait for slave LVDS PHY being locked */
+	if (priv->is_slave)
+		return 0;
+
+	ret = regmap_read_poll_timeout(priv->regmap, DPHY_LOCK, locked,
+				       locked, PLL_LOCK_SLEEP,
+				       PLL_LOCK_TIMEOUT);
+	if (ret < 0) {
+		dev_err(&phy->dev, "Could not get LVDS PHY lock (%d)!\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mixel_dphy_power_on(struct phy *phy)
+{
+	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	ret = clk_prepare_enable(priv->phy_ref_clk);
+	if (ret < 0)
+		return ret;
+
+	if (phy->attrs.mode == PHY_MODE_MIPI_DPHY) {
+		ret = mixel_dphy_power_on_mipi_dphy(phy);
+	} else if (phy->attrs.mode == PHY_MODE_LVDS) {
+		ret = mixel_dphy_power_on_lvds_phy(phy);
+	} else {
+		dev_err(&phy->dev,
+			"Failed to power on PHY with invalid PHY mode: %d\n",
+							phy->attrs.mode);
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		goto clock_disable;
+
+	return 0;
 clock_disable:
 	clk_disable_unprepare(priv->phy_ref_clk);
 	return ret;
@@ -406,16 +598,51 @@ static int mixel_dphy_power_off(struct phy *phy)
 	phy_write(phy, PWR_OFF, DPHY_PD_PLL);
 	phy_write(phy, PWR_OFF, DPHY_PD_DPHY);
 
+	if (phy->attrs.mode == PHY_MODE_LVDS)
+		regmap_update_bits(priv->lvds_regmap, PHY_CTRL, LVDS_EN, 0);
+
 	clk_disable_unprepare(priv->phy_ref_clk);
 
 	return 0;
 }
 
+static int mixel_dphy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
+{
+	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	if (priv->devdata->is_combo && mode != PHY_MODE_LVDS) {
+		dev_err(&phy->dev, "Failed to set PHY mode for combo PHY\n");
+		return -EINVAL;
+	}
+
+	if (!priv->devdata->is_combo && mode != PHY_MODE_MIPI_DPHY) {
+		dev_err(&phy->dev, "Failed to set PHY mode to MIPI DPHY\n");
+		return -EINVAL;
+	}
+
+	if (priv->devdata->is_combo) {
+		u32 rsc = priv->id ? IMX_SC_R_MIPI_1 : IMX_SC_R_MIPI_0;
+
+		ret = imx_sc_misc_set_control(priv->ipc_handle,
+					      rsc, IMX_SC_C_MODE,
+					      mode == PHY_MODE_LVDS);
+		if (ret) {
+			dev_err(&phy->dev,
+				"Failed to set PHY mode via SCU ipc: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static const struct phy_ops mixel_dphy_phy_ops = {
 	.init = mixel_dphy_init,
 	.exit = mixel_dphy_exit,
 	.power_on = mixel_dphy_power_on,
 	.power_off = mixel_dphy_power_off,
+	.set_mode = mixel_dphy_set_mode,
 	.configure = mixel_dphy_configure,
 	.validate = mixel_dphy_validate,
 	.owner = THIS_MODULE,
@@ -424,6 +651,8 @@ static const struct phy_ops mixel_dphy_phy_ops = {
 static const struct of_device_id mixel_dphy_of_match[] = {
 	{ .compatible = "fsl,imx8mq-mipi-dphy",
 	  .data = &mixel_dphy_devdata[MIXEL_IMX8MQ] },
+	{ .compatible = "fsl,imx8qxp-mipi-dphy",
+	  .data = &mixel_dphy_devdata[MIXEL_IMX8QXP] },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, mixel_dphy_of_match);
@@ -436,6 +665,7 @@ static int mixel_dphy_probe(struct platform_device *pdev)
 	struct mixel_dphy_priv *priv;
 	struct phy *phy;
 	void __iomem *base;
+	int ret;
 
 	if (!np)
 		return -ENODEV;
@@ -467,6 +697,30 @@ static int mixel_dphy_probe(struct platform_device *pdev)
 	dev_dbg(dev, "phy_ref clock rate: %lu\n",
 		clk_get_rate(priv->phy_ref_clk));
 
+	if (priv->devdata->is_combo) {
+		priv->lvds_regmap =
+			syscon_regmap_lookup_by_phandle(np, "fsl,syscon");
+		if (IS_ERR(priv->lvds_regmap)) {
+			ret = PTR_ERR(priv->lvds_regmap);
+			dev_err_probe(dev, ret, "Failed to get LVDS regmap\n");
+			return ret;
+		}
+
+		priv->id = of_alias_get_id(np, "mipi_dphy");
+		if (priv->id < 0) {
+			dev_err(dev, "Failed to get phy node alias id: %d\n",
+				priv->id);
+			return priv->id;
+		}
+
+		ret = imx_scu_get_handle(&priv->ipc_handle);
+		if (ret) {
+			dev_err_probe(dev, ret,
+				      "Failed to get SCU ipc handle\n");
+			return ret;
+		}
+	}
+
 	dev_set_drvdata(dev, priv);
 
 	phy = devm_phy_create(dev, np, &mixel_dphy_phy_ops);