[PATCH v4 0/2] Add Synopsys High-Speed USB PHY driver for Qualcomm SoCs

[PATCH v4 0/2] Add Synopsys High-Speed USB PHY driver for Qualcomm SoCs

[Shawn Guo]

It's based on a downstream driver from Sriharsha Allenki <sallenki@codeaurora.org>
that uses USB phy framework, and gets rewrote to adpot generic phy
framework together with quite some cleanups.

Changes for v4:
 - Kill device tree property 'qcom,init-seq' by moving the settings
   into phy driver as device match data.

Changes for v3:
 - Use SoC specific compatible "qcom,qcs404-usb-hsphy".
 - Use OF graph instead of extcon bindings to model the link to USB
   connector.

Changes for v2:
 - Add a pointer to phy/phy-bindings.txt for property #phy-cells.
 - Roll back voltage settings in case function
   qcom_snps_hsphy_config_regulators() fails in the middle.
 - Add a comment for init-seq tuple which consists of 3 numbers.
 - Sort include headers alphabetically.
 - Sort register definitions in order of offset.

Shawn Guo (1):
  phy: qualcomm: Add Synopsys High-Speed USB PHY driver

Sriharsha Allenki (1):
  dt-bindings: phy: Add Qualcomm Synopsys High-Speed USB PHY binding

 .../phy/qcom,snps-28nm-usb-hs-phy.txt         |  87 +++
 drivers/phy/qualcomm/Kconfig                  |  10 +
 drivers/phy/qualcomm/Makefile                 |   1 +
 .../phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c  | 535 ++++++++++++++++++
 4 files changed, 633 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt
 create mode 100644 drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c

-- 
2.18.0

[PATCH v4 1/2] dt-bindings: phy: Add Qualcomm Synopsys High-Speed USB PHY binding

[Shawn Guo]

From: Sriharsha Allenki <sallenki@codeaurora.org>

It adds bindings for Synopsys 28nm femto phy controller that supports
LS/FS/HS usb connectivity on Qualcomm chipsets.

Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>
Signed-off-by: Anu Ramanathan <anur@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 .../phy/qcom,snps-28nm-usb-hs-phy.txt         | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt b/Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt
new file mode 100644
index 000000000000..301987e716fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt
@@ -0,0 +1,87 @@
+Qualcomm Synopsys 28nm Femto phy controller
+===========================================
+
+Synopsys 28nm femto phy controller supports LS/FS/HS usb connectivity on
+Qualcomm chipsets.
+
+Required properties:
+
+- compatible:
+    Value type: <string>
+    Definition: Should contain "qcom,qcs404-usb-hsphy".
+
+- reg:
+    Value type: <prop-encoded-array>
+    Definition: USB PHY base address and length of the register map.
+
+- #phy-cells:
+    Value type: <u32>
+    Definition: Should be 0. See phy/phy-bindings.txt for details.
+
+- clocks:
+    Value type: <prop-encoded-array>
+    Definition: See clock-bindings.txt section "consumers". List of
+		three clock specifiers for reference, phy core and
+		sleep clocks.
+
+- clock-names:
+    Value type: <string>
+    Definition: Names of the clocks in 1-1 correspondence with the "clocks"
+		property. Must contain "ref", "phy" and "sleep".
+
+- resets:
+    Value type: <prop-encoded-array>
+    Definition: See reset.txt section "consumers". PHY reset specifiers
+		for phy core and POR resets.
+
+- reset-names:
+    Value type: <string>
+    Definition: Names of the resets in 1-1 correspondence with the "resets"
+		property. Must contain "phy" and "por".
+
+- vdd-supply:
+    Value type: <phandle>
+    Definition: phandle to the regulator VDD supply node.
+
+- vdda1p8-supply:
+    Value type: <phandle>
+    Definition: phandle to the regulator 1.8V supply node.
+
+- vdda3p3-supply:
+    Value type: <phandle>
+    Definition: phandle to the regulator 3.3V supply node.
+
+- qcom,vdd-voltage-level:
+    Value type: <prop-array>
+    Definition: This is a list of three integer values <no min max> where
+		each value corresponding to voltage corner in uV.
+
+Optional child nodes:
+
+- The link to the USB connector should be modeled using the OF graph bindings
+  specified in bindings/graph.txt.
+
+Example:
+
+	phy@7a000 {
+		compatible = "qcom,qcs404-usb-hsphy";
+		reg = <0x7a000 0x200>;
+		#phy-cells = <0>;
+		clocks = <&rpmcc RPM_SMD_LN_BB_CLK>,
+			 <&gcc GCC_USB_HS_PHY_CFG_AHB_CLK>,
+			 <&gcc GCC_USB2A_PHY_SLEEP_CLK>;
+		clock-names = "ref", "phy", "sleep";
+		resets = <&gcc GCC_USB_HS_PHY_CFG_AHB_BCR>,
+			 <&gcc GCC_USB2A_PHY_BCR>;
+		reset-names = "phy", "por";
+		vdd-supply = <&vreg_l4_1p2>;
+		vdda1p8-supply = <&vreg_l5_1p8>;
+		vdda3p3-supply = <&vreg_l12_3p3>;
+		qcom,vdd-voltage-level = <0 1144000 1200000>;
+
+		port {
+			ep_usb_phy: endpoint {
+				remote-endpoint = <&ep_usb_con>;
+			};
+		};
+	};
-- 
2.18.0

[PATCH v4 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY driver

[Shawn Guo]

It adds Synopsys 28nm Femto High-Speed USB PHY driver support, which
is usually paired with Synopsys DWC3 USB controllers on Qualcomm SoCs.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 drivers/phy/qualcomm/Kconfig                  |  10 +
 drivers/phy/qualcomm/Makefile                 |   1 +
 .../phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c  | 535 ++++++++++++++++++
 3 files changed, 546 insertions(+)
 create mode 100644 drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c

diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
index 32f7d34eb784..c7b5ee82895d 100644
--- a/drivers/phy/qualcomm/Kconfig
+++ b/drivers/phy/qualcomm/Kconfig
@@ -82,3 +82,13 @@ config PHY_QCOM_USB_HSIC
 	select GENERIC_PHY
 	help
 	  Support for the USB HSIC ULPI compliant PHY on QCOM chipsets.
+
+config PHY_QCOM_USB_HS_SNPS_28NM
+	tristate "Qualcomm Synopsys 28nm USB HS PHY driver"
+	depends on ARCH_QCOM || COMPILE_TEST
+	depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in
+	select GENERIC_PHY
+	help
+	  Enable this to support the Synopsys 28nm Femto USB PHY on Qualcomm
+	  chips. This driver supports the high-speed PHY which is usually
+	  paired with either the ChipIdea or Synopsys DWC3 USB IPs on MSM SOCs.
diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
index c56efd3af205..dc238d95b18c 100644
--- a/drivers/phy/qualcomm/Makefile
+++ b/drivers/phy/qualcomm/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_PHY_QCOM_UFS_14NM)		+= phy-qcom-ufs-qmp-14nm.o
 obj-$(CONFIG_PHY_QCOM_UFS_20NM)		+= phy-qcom-ufs-qmp-20nm.o
 obj-$(CONFIG_PHY_QCOM_USB_HS) 		+= phy-qcom-usb-hs.o
 obj-$(CONFIG_PHY_QCOM_USB_HSIC) 	+= phy-qcom-usb-hsic.o
+obj-$(CONFIG_PHY_QCOM_USB_HS_SNPS_28NM)	+= phy-qcom-usb-hs-snsp-28nm.o
diff --git a/drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c b/drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c
new file mode 100644
index 000000000000..ee52bb6df6da
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c
@@ -0,0 +1,535 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2009-2018, Linux Foundation. All rights reserved.
+ * Copyright (c) 2018, Linaro Limited
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/extcon.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+/* PHY register and bit definitions */
+#define PHY_CTRL_COMMON0		0x078
+#define SIDDQ				BIT(2)
+#define PHY_IRQ_CMD			0x0d0
+#define PHY_INTR_MASK0			0x0d4
+#define PHY_INTR_CLEAR0			0x0dc
+#define DPDM_MASK			0x1e
+#define DP_1_0				BIT(4)
+#define DP_0_1				BIT(3)
+#define DM_1_0				BIT(2)
+#define DM_0_1				BIT(1)
+
+enum hsphy_voltage {
+	VOL_NONE,
+	VOL_MIN,
+	VOL_MAX,
+	VOL_NUM,
+};
+
+enum hsphy_vreg {
+	VDD,
+	VDDA_1P8,
+	VDDA_3P3,
+	VREG_NUM,
+};
+
+struct hsphy_init_seq {
+	int offset;
+	int val;
+	int delay;
+};
+
+struct hsphy_data {
+	const struct hsphy_init_seq *init_seq;
+	unsigned int init_seq_num;
+};
+
+struct hsphy_priv {
+	void __iomem *base;
+	struct clk_bulk_data *clks;
+	int num_clks;
+	struct reset_control *phy_reset;
+	struct reset_control *por_reset;
+	struct regulator_bulk_data vregs[VREG_NUM];
+	unsigned int voltages[VREG_NUM][VOL_NUM];
+	const struct hsphy_data *data;
+	bool cable_connected;
+	struct extcon_dev *vbus_edev;
+	struct notifier_block vbus_notify;
+	enum phy_mode mode;
+};
+
+static int qcom_snps_hsphy_config_regulators(struct hsphy_priv *priv, int high)
+{
+	int old_uV[VREG_NUM];
+	int min, ret, i;
+
+	min = high ? 1 : 0; /* low or none? */
+
+	for (i = 0; i < VREG_NUM; i++) {
+		old_uV[i] = regulator_get_voltage(priv->vregs[i].consumer);
+		ret = regulator_set_voltage(priv->vregs[i].consumer,
+					    priv->voltages[i][min],
+					    priv->voltages[i][VOL_MAX]);
+		if (ret)
+			goto roll_back;
+	}
+
+	return 0;
+
+roll_back:
+	for (; i >= 0; i--)
+		regulator_set_voltage(priv->vregs[i].consumer,
+				      old_uV[i], old_uV[i]);
+	return ret;
+}
+
+static int qcom_snps_hsphy_enable_regulators(struct hsphy_priv *priv)
+{
+	int ret;
+
+	ret = qcom_snps_hsphy_config_regulators(priv, 1);
+	if (ret)
+		return ret;
+
+	ret = regulator_set_load(priv->vregs[VDDA_1P8].consumer, 19000);
+	if (ret < 0)
+		goto unconfig_regulators;
+
+	ret = regulator_set_load(priv->vregs[VDDA_3P3].consumer, 16000);
+	if (ret < 0)
+		goto unset_1p8_load;
+
+	ret = regulator_bulk_enable(VREG_NUM, priv->vregs);
+	if (ret)
+		goto unset_3p3_load;
+
+	return 0;
+
+unset_3p3_load:
+	regulator_set_load(priv->vregs[VDDA_3P3].consumer, 0);
+unset_1p8_load:
+	regulator_set_load(priv->vregs[VDDA_1P8].consumer, 0);
+unconfig_regulators:
+	qcom_snps_hsphy_config_regulators(priv, 0);
+	return ret;
+}
+
+static void qcom_snps_hsphy_disable_regulators(struct hsphy_priv *priv)
+{
+	regulator_bulk_disable(VREG_NUM, priv->vregs);
+	regulator_set_load(priv->vregs[VDDA_1P8].consumer, 0);
+	regulator_set_load(priv->vregs[VDDA_3P3].consumer, 0);
+	qcom_snps_hsphy_config_regulators(priv, 0);
+}
+
+static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode)
+{
+	struct hsphy_priv *priv = phy_get_drvdata(phy);
+
+	priv->mode = mode;
+
+	return 0;
+}
+
+static void qcom_snps_hsphy_enable_hv_interrupts(struct hsphy_priv *priv)
+{
+	u32 val;
+
+	/* Clear any existing interrupts before enabling the interrupts */
+	val = readb(priv->base + PHY_INTR_CLEAR0);
+	val |= DPDM_MASK;
+	writeb(val, priv->base + PHY_INTR_CLEAR0);
+
+	writeb(0x0, priv->base + PHY_IRQ_CMD);
+	usleep_range(200, 220);
+	writeb(0x1, priv->base + PHY_IRQ_CMD);
+
+	/* Make sure the interrupts are cleared */
+	usleep_range(200, 220);
+
+	val = readb(priv->base + PHY_INTR_MASK0);
+	switch (priv->mode) {
+	case PHY_MODE_USB_HOST_HS:
+	case PHY_MODE_USB_HOST_FS:
+	case PHY_MODE_USB_DEVICE_HS:
+	case PHY_MODE_USB_DEVICE_FS:
+		val |= DP_1_0 | DM_0_1;
+		break;
+	case PHY_MODE_USB_HOST_LS:
+	case PHY_MODE_USB_DEVICE_LS:
+		val |= DP_0_1 | DM_1_0;
+		break;
+	default:
+		/* No device connected */
+		val |= DP_0_1 | DM_0_1;
+		break;
+	}
+	writeb(val, priv->base + PHY_INTR_MASK0);
+}
+
+static void qcom_snps_hsphy_disable_hv_interrupts(struct hsphy_priv *priv)
+{
+	u32 val;
+
+	val = readb(priv->base + PHY_INTR_MASK0);
+	val &= ~DPDM_MASK;
+	writeb(val, priv->base + PHY_INTR_MASK0);
+
+	/* Clear any pending interrupts */
+	val = readb(priv->base + PHY_INTR_CLEAR0);
+	val |= DPDM_MASK;
+	writeb(val, priv->base + PHY_INTR_CLEAR0);
+
+	writeb(0x0, priv->base + PHY_IRQ_CMD);
+	usleep_range(200, 220);
+
+	writeb(0x1, priv->base + PHY_IRQ_CMD);
+	usleep_range(200, 220);
+}
+
+static void qcom_snps_hsphy_enter_retention(struct hsphy_priv *priv)
+{
+	u32 val;
+
+	val = readb(priv->base + PHY_CTRL_COMMON0);
+	val |= SIDDQ;
+	writeb(val, priv->base + PHY_CTRL_COMMON0);
+}
+
+static void qcom_snps_hsphy_exit_retention(struct hsphy_priv *priv)
+{
+	u32 val;
+
+	val = readb(priv->base + PHY_CTRL_COMMON0);
+	val &= ~SIDDQ;
+	writeb(val, priv->base + PHY_CTRL_COMMON0);
+}
+
+static int qcom_snps_hsphy_vbus_notifier(struct notifier_block *nb,
+					 unsigned long event, void *ptr)
+{
+	struct hsphy_priv *priv = container_of(nb, struct hsphy_priv,
+						    vbus_notify);
+	priv->cable_connected = !!event;
+	return 0;
+}
+
+static int qcom_snps_hsphy_power_on(struct phy *phy)
+{
+	struct hsphy_priv *priv = phy_get_drvdata(phy);
+	int ret;
+
+	if (priv->cable_connected) {
+		ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks);
+		if (ret)
+			return ret;
+		qcom_snps_hsphy_disable_hv_interrupts(priv);
+	} else {
+		ret = qcom_snps_hsphy_enable_regulators(priv);
+		if (ret)
+			return ret;
+		ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks);
+		if (ret)
+			return ret;
+		qcom_snps_hsphy_exit_retention(priv);
+	}
+
+	return 0;
+}
+
+static int qcom_snps_hsphy_power_off(struct phy *phy)
+{
+	struct hsphy_priv *priv = phy_get_drvdata(phy);
+
+	if (priv->cable_connected) {
+		qcom_snps_hsphy_enable_hv_interrupts(priv);
+		clk_bulk_disable_unprepare(priv->num_clks, priv->clks);
+	} else {
+		qcom_snps_hsphy_enter_retention(priv);
+		clk_bulk_disable_unprepare(priv->num_clks, priv->clks);
+		qcom_snps_hsphy_disable_regulators(priv);
+	}
+
+	return 0;
+}
+
+static int qcom_snps_hsphy_reset(struct hsphy_priv *priv)
+{
+	int ret;
+
+	ret = reset_control_assert(priv->phy_reset);
+	if (ret)
+		return ret;
+
+	usleep_range(10, 15);
+
+	ret = reset_control_deassert(priv->phy_reset);
+	if (ret)
+		return ret;
+
+	usleep_range(80, 100);
+
+	return 0;
+}
+
+static void qcom_snps_hsphy_init_sequence(struct hsphy_priv *priv)
+{
+	const struct hsphy_data *data = priv->data;
+	const struct hsphy_init_seq *seq;
+	int i;
+
+	/* Device match data is optional. */
+	if (!data)
+		return;
+
+	seq = data->init_seq;
+
+	for (i = 0; i < data->init_seq_num; i++, seq++) {
+		writeb(seq->val, priv->base + seq->offset);
+		if (seq->delay)
+			usleep_range(seq->delay, seq->delay + 10);
+	}
+
+	/* Ensure that the above parameter overrides is successful. */
+	mb();
+}
+
+static int qcom_snps_hsphy_por_reset(struct hsphy_priv *priv)
+{
+	int ret;
+
+	ret = reset_control_assert(priv->por_reset);
+	if (ret)
+		return ret;
+
+	/*
+	 * The Femto PHY is POR reset in the following scenarios.
+	 *
+	 * 1. After overriding the parameter registers.
+	 * 2. Low power mode exit from PHY retention.
+	 *
+	 * Ensure that SIDDQ is cleared before bringing the PHY
+	 * out of reset.
+	 */
+	qcom_snps_hsphy_exit_retention(priv);
+
+	/*
+	 * As per databook, 10 usec delay is required between
+	 * PHY POR assert and de-assert.
+	 */
+	usleep_range(10, 20);
+	ret = reset_control_deassert(priv->por_reset);
+	if (ret)
+		return ret;
+
+	/*
+	 * As per databook, it takes 75 usec for PHY to stabilize
+	 * after the reset.
+	 */
+	usleep_range(80, 100);
+
+	/* Ensure that RESET operation is completed. */
+	mb();
+
+	return 0;
+}
+
+static int qcom_snps_hsphy_init(struct phy *phy)
+{
+	struct hsphy_priv *priv = phy_get_drvdata(phy);
+	int state;
+	int ret;
+
+	ret = qcom_snps_hsphy_reset(priv);
+	if (ret)
+		return ret;
+
+	qcom_snps_hsphy_init_sequence(priv);
+
+	ret = qcom_snps_hsphy_por_reset(priv);
+	if (ret)
+		return ret;
+
+	/* Setup initial state */
+	if (priv->vbus_edev) {
+		state = extcon_get_state(priv->vbus_edev, EXTCON_USB);
+		ret = qcom_snps_hsphy_vbus_notifier(&priv->vbus_notify, state,
+						    priv->vbus_edev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct phy_ops qcom_snps_hsphy_ops = {
+	.init = qcom_snps_hsphy_init,
+	.power_on = qcom_snps_hsphy_power_on,
+	.power_off = qcom_snps_hsphy_power_off,
+	.set_mode = qcom_snps_hsphy_set_mode,
+	.owner = THIS_MODULE,
+};
+
+static const char * const qcom_snps_hsphy_clks[] = {
+	"ref",
+	"phy",
+	"sleep",
+};
+
+static int qcom_snps_hsphy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *extcon_node;
+	struct phy_provider *provider;
+	struct hsphy_priv *priv;
+	struct resource *res;
+	struct phy *phy;
+	int ret;
+	int i;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	priv->num_clks = ARRAY_SIZE(qcom_snps_hsphy_clks);
+	priv->clks = devm_kcalloc(dev, priv->num_clks, sizeof(*priv->clks),
+				  GFP_KERNEL);
+	if (!priv->clks)
+		return -ENOMEM;
+
+	for (i = 0; i < priv->num_clks; i++)
+		priv->clks[i].id = qcom_snps_hsphy_clks[i];
+
+	ret = devm_clk_bulk_get(dev, priv->num_clks, priv->clks);
+	if (ret)
+		return ret;
+
+	priv->phy_reset = devm_reset_control_get(dev, "phy");
+	if (IS_ERR(priv->phy_reset))
+		return PTR_ERR(priv->phy_reset);
+
+	priv->por_reset = devm_reset_control_get(dev, "por");
+	if (IS_ERR(priv->por_reset))
+		return PTR_ERR(priv->por_reset);
+
+	priv->vregs[VDD].supply = "vdd";
+	priv->vregs[VDDA_1P8].supply = "vdda1p8";
+	priv->vregs[VDDA_3P3].supply = "vdda3p3";
+
+	ret = devm_regulator_bulk_get(dev, VREG_NUM, priv->vregs);
+	if (ret)
+		return ret;
+
+	priv->voltages[VDDA_1P8][VOL_NONE] = 0;
+	priv->voltages[VDDA_1P8][VOL_MIN] = 1800000;
+	priv->voltages[VDDA_1P8][VOL_MAX] = 1800000;
+
+	priv->voltages[VDDA_3P3][VOL_NONE] = 0;
+	priv->voltages[VDDA_3P3][VOL_MIN] = 3050000;
+	priv->voltages[VDDA_3P3][VOL_MAX] = 3300000;
+
+	ret = of_property_read_u32_array(dev->of_node, "qcom,vdd-voltage-level",
+					 priv->voltages[VDD], VOL_NUM);
+	if (ret) {
+		dev_err(dev, "failed to read qcom,vdd-voltage-level\n");
+		return ret;
+	}
+
+	extcon_node = of_graph_get_remote_node(dev->of_node, -1, -1);
+	if (extcon_node) {
+		priv->vbus_edev = extcon_find_edev_by_node(extcon_node);
+		if (IS_ERR(priv->vbus_edev)) {
+			if (PTR_ERR(priv->vbus_edev) != -ENODEV) {
+				of_node_put(extcon_node);
+				return PTR_ERR(priv->vbus_edev);
+			}
+			priv->vbus_edev = NULL;
+		}
+	}
+	of_node_put(extcon_node);
+
+	if (priv->vbus_edev) {
+		priv->vbus_notify.notifier_call = qcom_snps_hsphy_vbus_notifier;
+		ret = devm_extcon_register_notifier(dev, priv->vbus_edev,
+						    EXTCON_USB,
+						    &priv->vbus_notify);
+		if (ret)
+			return ret;
+	}
+
+	/* Get device match data */
+	priv->data = device_get_match_data(dev);
+
+	phy = devm_phy_create(dev, dev->of_node, &qcom_snps_hsphy_ops);
+	if (IS_ERR(phy))
+		return PTR_ERR(phy);
+
+	phy_set_drvdata(phy, priv);
+
+	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+/*
+ * The macro is used to define an initialization sequence.  Each tuple
+ * is meant to program 'value' into phy register at 'offset' with 'delay'
+ * in us followed.
+ */
+#define HSPHY_INIT_CFG(o, v, d)	{ .offset = o, .val = v, .delay = d, }
+
+static const struct hsphy_init_seq init_seq_qcs404[] = {
+	HSPHY_INIT_CFG(0xc0, 0x01, 0),
+	HSPHY_INIT_CFG(0xe8, 0x0d, 0),
+	HSPHY_INIT_CFG(0x74, 0x12, 0),
+	HSPHY_INIT_CFG(0x98, 0x63, 0),
+	HSPHY_INIT_CFG(0x9c, 0x03, 0),
+	HSPHY_INIT_CFG(0xa0, 0x1d, 0),
+	HSPHY_INIT_CFG(0xa4, 0x03, 0),
+	HSPHY_INIT_CFG(0x8c, 0x23, 0),
+	HSPHY_INIT_CFG(0x78, 0x08, 0),
+	HSPHY_INIT_CFG(0x7c, 0xdc, 0),
+	HSPHY_INIT_CFG(0x90, 0xe0, 20),
+	HSPHY_INIT_CFG(0x74, 0x10, 0),
+	HSPHY_INIT_CFG(0x90, 0x60, 0),
+};
+
+static const struct hsphy_data hsphy_data_qcs404 = {
+	.init_seq = init_seq_qcs404,
+	.init_seq_num = ARRAY_SIZE(init_seq_qcs404),
+};
+
+static const struct of_device_id qcom_snps_hsphy_match[] = {
+	{ .compatible = "qcom,qcs404-usb-hsphy", .data = &hsphy_data_qcs404, },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, qcom_snps_hsphy_match);
+
+static struct platform_driver qcom_snps_hsphy_driver = {
+	.probe = qcom_snps_hsphy_probe,
+	.driver	= {
+		.name = "qcom-usb-snps-hsphy",
+		.of_match_table = qcom_snps_hsphy_match,
+	},
+};
+module_platform_driver(qcom_snps_hsphy_driver);
+
+MODULE_DESCRIPTION("Qualcomm Synopsys 28nm USB High-Speed PHY driver");
+MODULE_LICENSE("GPL v2");
-- 
2.18.0

Re: [PATCH v4 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY driver

[Kishon Vijay Abraham I]

Hi,

On 19/11/18 4:38 PM, Shawn Guo wrote:
> It adds Synopsys 28nm Femto High-Speed USB PHY driver support, which
> is usually paired with Synopsys DWC3 USB controllers on Qualcomm SoCs.
> 
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> ---
>  drivers/phy/qualcomm/Kconfig                  |  10 +
>  drivers/phy/qualcomm/Makefile                 |   1 +
>  .../phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c  | 535 ++++++++++++++++++
>  3 files changed, 546 insertions(+)
>  create mode 100644 drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c
> 
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index 32f7d34eb784..c7b5ee82895d 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -82,3 +82,13 @@ config PHY_QCOM_USB_HSIC
>  	select GENERIC_PHY
>  	help
>  	  Support for the USB HSIC ULPI compliant PHY on QCOM chipsets.
> +
> +config PHY_QCOM_USB_HS_SNPS_28NM
> +	tristate "Qualcomm Synopsys 28nm USB HS PHY driver"
> +	depends on ARCH_QCOM || COMPILE_TEST
> +	depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in
> +	select GENERIC_PHY
> +	help
> +	  Enable this to support the Synopsys 28nm Femto USB PHY on Qualcomm
> +	  chips. This driver supports the high-speed PHY which is usually
> +	  paired with either the ChipIdea or Synopsys DWC3 USB IPs on MSM SOCs.
> diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
> index c56efd3af205..dc238d95b18c 100644
> --- a/drivers/phy/qualcomm/Makefile
> +++ b/drivers/phy/qualcomm/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_PHY_QCOM_UFS_14NM)		+= phy-qcom-ufs-qmp-14nm.o
>  obj-$(CONFIG_PHY_QCOM_UFS_20NM)		+= phy-qcom-ufs-qmp-20nm.o
>  obj-$(CONFIG_PHY_QCOM_USB_HS) 		+= phy-qcom-usb-hs.o
>  obj-$(CONFIG_PHY_QCOM_USB_HSIC) 	+= phy-qcom-usb-hsic.o
> +obj-$(CONFIG_PHY_QCOM_USB_HS_SNPS_28NM)	+= phy-qcom-usb-hs-snsp-28nm.o
> diff --git a/drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c b/drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c
> new file mode 100644
> index 000000000000..ee52bb6df6da
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-usb-hs-snsp-28nm.c
> @@ -0,0 +1,535 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2009-2018, Linux Foundation. All rights reserved.
> + * Copyright (c) 2018, Linaro Limited
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/extcon.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +/* PHY register and bit definitions */
> +#define PHY_CTRL_COMMON0		0x078
> +#define SIDDQ				BIT(2)
> +#define PHY_IRQ_CMD			0x0d0
> +#define PHY_INTR_MASK0			0x0d4
> +#define PHY_INTR_CLEAR0			0x0dc
> +#define DPDM_MASK			0x1e
> +#define DP_1_0				BIT(4)
> +#define DP_0_1				BIT(3)
> +#define DM_1_0				BIT(2)
> +#define DM_0_1				BIT(1)
> +
> +enum hsphy_voltage {
> +	VOL_NONE,
> +	VOL_MIN,
> +	VOL_MAX,
> +	VOL_NUM,
> +};
> +
> +enum hsphy_vreg {
> +	VDD,
> +	VDDA_1P8,
> +	VDDA_3P3,
> +	VREG_NUM,
> +};
> +
> +struct hsphy_init_seq {
> +	int offset;
> +	int val;
> +	int delay;
> +};
> +
> +struct hsphy_data {
> +	const struct hsphy_init_seq *init_seq;
> +	unsigned int init_seq_num;
> +};
> +
> +struct hsphy_priv {
> +	void __iomem *base;
> +	struct clk_bulk_data *clks;
> +	int num_clks;
> +	struct reset_control *phy_reset;
> +	struct reset_control *por_reset;
> +	struct regulator_bulk_data vregs[VREG_NUM];
> +	unsigned int voltages[VREG_NUM][VOL_NUM];
> +	const struct hsphy_data *data;
> +	bool cable_connected;
> +	struct extcon_dev *vbus_edev;
> +	struct notifier_block vbus_notify;
> +	enum phy_mode mode;
> +};
> +
> +static int qcom_snps_hsphy_config_regulators(struct hsphy_priv *priv, int high)
> +{
> +	int old_uV[VREG_NUM];
> +	int min, ret, i;
> +
> +	min = high ? 1 : 0; /* low or none? */
> +
> +	for (i = 0; i < VREG_NUM; i++) {
> +		old_uV[i] = regulator_get_voltage(priv->vregs[i].consumer);
> +		ret = regulator_set_voltage(priv->vregs[i].consumer,
> +					    priv->voltages[i][min],
> +					    priv->voltages[i][VOL_MAX]);
> +		if (ret)
> +			goto roll_back;
> +	}
> +
> +	return 0;
> +
> +roll_back:
> +	for (; i >= 0; i--)
> +		regulator_set_voltage(priv->vregs[i].consumer,
> +				      old_uV[i], old_uV[i]);
> +	return ret;
> +}
> +
> +static int qcom_snps_hsphy_enable_regulators(struct hsphy_priv *priv)
> +{
> +	int ret;
> +
> +	ret = qcom_snps_hsphy_config_regulators(priv, 1);
> +	if (ret)
> +		return ret;
> +
> +	ret = regulator_set_load(priv->vregs[VDDA_1P8].consumer, 19000);
> +	if (ret < 0)
> +		goto unconfig_regulators;
> +
> +	ret = regulator_set_load(priv->vregs[VDDA_3P3].consumer, 16000);
> +	if (ret < 0)
> +		goto unset_1p8_load;
> +
> +	ret = regulator_bulk_enable(VREG_NUM, priv->vregs);
> +	if (ret)
> +		goto unset_3p3_load;
> +
> +	return 0;
> +
> +unset_3p3_load:
> +	regulator_set_load(priv->vregs[VDDA_3P3].consumer, 0);
> +unset_1p8_load:
> +	regulator_set_load(priv->vregs[VDDA_1P8].consumer, 0);
> +unconfig_regulators:
> +	qcom_snps_hsphy_config_regulators(priv, 0);
> +	return ret;
> +}
> +
> +static void qcom_snps_hsphy_disable_regulators(struct hsphy_priv *priv)
> +{
> +	regulator_bulk_disable(VREG_NUM, priv->vregs);
> +	regulator_set_load(priv->vregs[VDDA_1P8].consumer, 0);
> +	regulator_set_load(priv->vregs[VDDA_3P3].consumer, 0);
> +	qcom_snps_hsphy_config_regulators(priv, 0);
> +}
> +
> +static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode)
> +{
> +	struct hsphy_priv *priv = phy_get_drvdata(phy);
> +
> +	priv->mode = mode;
> +
> +	return 0;
> +}
> +
> +static void qcom_snps_hsphy_enable_hv_interrupts(struct hsphy_priv *priv)
> +{
> +	u32 val;
> +
> +	/* Clear any existing interrupts before enabling the interrupts */
> +	val = readb(priv->base + PHY_INTR_CLEAR0);
> +	val |= DPDM_MASK;
> +	writeb(val, priv->base + PHY_INTR_CLEAR0);
> +
> +	writeb(0x0, priv->base + PHY_IRQ_CMD);
> +	usleep_range(200, 220);
> +	writeb(0x1, priv->base + PHY_IRQ_CMD);
> +
> +	/* Make sure the interrupts are cleared */
> +	usleep_range(200, 220);
> +
> +	val = readb(priv->base + PHY_INTR_MASK0);
> +	switch (priv->mode) {
> +	case PHY_MODE_USB_HOST_HS:
> +	case PHY_MODE_USB_HOST_FS:
> +	case PHY_MODE_USB_DEVICE_HS:
> +	case PHY_MODE_USB_DEVICE_FS:
> +		val |= DP_1_0 | DM_0_1;
> +		break;
> +	case PHY_MODE_USB_HOST_LS:
> +	case PHY_MODE_USB_DEVICE_LS:
> +		val |= DP_0_1 | DM_1_0;
> +		break;
> +	default:
> +		/* No device connected */
> +		val |= DP_0_1 | DM_0_1;
> +		break;
> +	}
> +	writeb(val, priv->base + PHY_INTR_MASK0);
> +}
> +
> +static void qcom_snps_hsphy_disable_hv_interrupts(struct hsphy_priv *priv)
> +{
> +	u32 val;
> +
> +	val = readb(priv->base + PHY_INTR_MASK0);
> +	val &= ~DPDM_MASK;
> +	writeb(val, priv->base + PHY_INTR_MASK0);
> +
> +	/* Clear any pending interrupts */
> +	val = readb(priv->base + PHY_INTR_CLEAR0);
> +	val |= DPDM_MASK;
> +	writeb(val, priv->base + PHY_INTR_CLEAR0);
> +
> +	writeb(0x0, priv->base + PHY_IRQ_CMD);
> +	usleep_range(200, 220);
> +
> +	writeb(0x1, priv->base + PHY_IRQ_CMD);
> +	usleep_range(200, 220);
> +}
> +
> +static void qcom_snps_hsphy_enter_retention(struct hsphy_priv *priv)
> +{
> +	u32 val;
> +
> +	val = readb(priv->base + PHY_CTRL_COMMON0);
> +	val |= SIDDQ;
> +	writeb(val, priv->base + PHY_CTRL_COMMON0);
> +}
> +
> +static void qcom_snps_hsphy_exit_retention(struct hsphy_priv *priv)
> +{
> +	u32 val;
> +
> +	val = readb(priv->base + PHY_CTRL_COMMON0);
> +	val &= ~SIDDQ;
> +	writeb(val, priv->base + PHY_CTRL_COMMON0);
> +}
> +
> +static int qcom_snps_hsphy_vbus_notifier(struct notifier_block *nb,
> +					 unsigned long event, void *ptr)
> +{
> +	struct hsphy_priv *priv = container_of(nb, struct hsphy_priv,
> +						    vbus_notify);
> +	priv->cable_connected = !!event;
> +	return 0;
> +}
> +
> +static int qcom_snps_hsphy_power_on(struct phy *phy)
> +{
> +	struct hsphy_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	if (priv->cable_connected) {
> +		ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks);
> +		if (ret)
> +			return ret;
> +		qcom_snps_hsphy_disable_hv_interrupts(priv);
> +	} else {
> +		ret = qcom_snps_hsphy_enable_regulators(priv);
> +		if (ret)
> +			return ret;
> +		ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks);
> +		if (ret)
> +			return ret;
> +		qcom_snps_hsphy_exit_retention(priv);
> +	}
> +
> +	return 0;
> +}
> +
> +static int qcom_snps_hsphy_power_off(struct phy *phy)
> +{
> +	struct hsphy_priv *priv = phy_get_drvdata(phy);
> +
> +	if (priv->cable_connected) {
> +		qcom_snps_hsphy_enable_hv_interrupts(priv);
> +		clk_bulk_disable_unprepare(priv->num_clks, priv->clks);
> +	} else {
> +		qcom_snps_hsphy_enter_retention(priv);
> +		clk_bulk_disable_unprepare(priv->num_clks, priv->clks);
> +		qcom_snps_hsphy_disable_regulators(priv);
> +	}
> +
> +	return 0;
> +}
> +
> +static int qcom_snps_hsphy_reset(struct hsphy_priv *priv)
> +{
> +	int ret;
> +
> +	ret = reset_control_assert(priv->phy_reset);
> +	if (ret)
> +		return ret;
> +
> +	usleep_range(10, 15);
> +
> +	ret = reset_control_deassert(priv->phy_reset);
> +	if (ret)
> +		return ret;
> +
> +	usleep_range(80, 100);
> +
> +	return 0;
> +}
> +
> +static void qcom_snps_hsphy_init_sequence(struct hsphy_priv *priv)
> +{
> +	const struct hsphy_data *data = priv->data;
> +	const struct hsphy_init_seq *seq;
> +	int i;
> +
> +	/* Device match data is optional. */
> +	if (!data)
> +		return;
> +
> +	seq = data->init_seq;
> +
> +	for (i = 0; i < data->init_seq_num; i++, seq++) {
> +		writeb(seq->val, priv->base + seq->offset);
> +		if (seq->delay)
> +			usleep_range(seq->delay, seq->delay + 10);
> +	}
> +
> +	/* Ensure that the above parameter overrides is successful. */
> +	mb();
> +}
> +
> +static int qcom_snps_hsphy_por_reset(struct hsphy_priv *priv)
> +{
> +	int ret;
> +
> +	ret = reset_control_assert(priv->por_reset);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * The Femto PHY is POR reset in the following scenarios.
> +	 *
> +	 * 1. After overriding the parameter registers.
> +	 * 2. Low power mode exit from PHY retention.
> +	 *
> +	 * Ensure that SIDDQ is cleared before bringing the PHY
> +	 * out of reset.
> +	 */
> +	qcom_snps_hsphy_exit_retention(priv);
> +
> +	/*
> +	 * As per databook, 10 usec delay is required between
> +	 * PHY POR assert and de-assert.
> +	 */
> +	usleep_range(10, 20);
> +	ret = reset_control_deassert(priv->por_reset);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * As per databook, it takes 75 usec for PHY to stabilize
> +	 * after the reset.
> +	 */
> +	usleep_range(80, 100);
> +
> +	/* Ensure that RESET operation is completed. */
> +	mb();

How will you ensure the reset operation is complete with a memory barrier? mb
usage here looks incorrect to me.

Thanks
Kishon

Re: [PATCH v4 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY driver

[Shawn Guo]

On Fri, Nov 23, 2018 at 03:25:33PM +0530, Kishon Vijay Abraham I wrote:
> > +static int qcom_snps_hsphy_por_reset(struct hsphy_priv *priv)
> > +{
> > +	int ret;
> > +
> > +	ret = reset_control_assert(priv->por_reset);
> > +	if (ret)
> > +		return ret;
> > +
> > +	/*
> > +	 * The Femto PHY is POR reset in the following scenarios.
> > +	 *
> > +	 * 1. After overriding the parameter registers.
> > +	 * 2. Low power mode exit from PHY retention.
> > +	 *
> > +	 * Ensure that SIDDQ is cleared before bringing the PHY
> > +	 * out of reset.
> > +	 */
> > +	qcom_snps_hsphy_exit_retention(priv);
> > +
> > +	/*
> > +	 * As per databook, 10 usec delay is required between
> > +	 * PHY POR assert and de-assert.
> > +	 */
> > +	usleep_range(10, 20);
> > +	ret = reset_control_deassert(priv->por_reset);
> > +	if (ret)
> > +		return ret;
> > +
> > +	/*
> > +	 * As per databook, it takes 75 usec for PHY to stabilize
> > +	 * after the reset.
> > +	 */
> > +	usleep_range(80, 100);
> > +
> > +	/* Ensure that RESET operation is completed. */
> > +	mb();
> 
> How will you ensure the reset operation is complete with a memory barrier? mb
> usage here looks incorrect to me.

I agree with you, Kishon.  I think memory barrier only ensures the
register write happens rather than that RESET operation completes.
Since the IO accessors already handle memory barrier, I will just drop
the mb() from here and function qcom_snps_hsphy_init_sequence() as well.

@Sriharsha, let us know if you have a story or reason for these memory
barriers.

Shawn

Re: [PATCH v4 1/2] dt-bindings: phy: Add Qualcomm Synopsys High-Speed USB PHY binding

[Rob Herring]

On Mon, Nov 19, 2018 at 5:08 AM Shawn Guo <shawn.guo@linaro.org> wrote:
>
> From: Sriharsha Allenki <sallenki@codeaurora.org>
>
> It adds bindings for Synopsys 28nm femto phy controller that supports
> LS/FS/HS usb connectivity on Qualcomm chipsets.
>
> Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>
> Signed-off-by: Anu Ramanathan <anur@codeaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> ---
>  .../phy/qcom,snps-28nm-usb-hs-phy.txt         | 87 +++++++++++++++++++
>  1 file changed, 87 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt

Reviewed-by: Rob Herring <robh@kernel.org>