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