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Subject[PATCH v3 2/2] phy: qualcomm: usb: Add SuperSpeed PHY driver
Date
Controls Qualcomm's SS phy 1.0.0 implemented in the QCS404 and some
other Qualcomm platforms.

Based on Sriharsha Allenki's <sallenki@codeaurora.org> original code.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
---
drivers/phy/qualcomm/Kconfig | 11 +
drivers/phy/qualcomm/Makefile | 1 +
drivers/phy/qualcomm/phy-qcom-usb-ss.c | 328 +++++++++++++++++++++++++
3 files changed, 340 insertions(+)
create mode 100644 drivers/phy/qualcomm/phy-qcom-usb-ss.c

diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
index 32f7d34eb784..a8dc550d25fb 100644
--- a/drivers/phy/qualcomm/Kconfig
+++ b/drivers/phy/qualcomm/Kconfig
@@ -82,3 +82,14 @@ config PHY_QCOM_USB_HSIC
select GENERIC_PHY
help
Support for the USB HSIC ULPI compliant PHY on QCOM chipsets.
+
+config PHY_QCOM_USB_SS
+ tristate "Qualcomm USB SS 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 Super-Speed USB transceiver on Qualcomm
+ chips. This driver supports the PHY which uses the QSCRATCH-based
+ register set for its control sequences, normally paired with newer
+ DWC3-based Super-Speed controllers on Qualcomm SoCs.
diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
index c56efd3af205..d594d532d137 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_SS) += phy-qcom-usb-ss.o
diff --git a/drivers/phy/qualcomm/phy-qcom-usb-ss.c b/drivers/phy/qualcomm/phy-qcom-usb-ss.c
new file mode 100644
index 000000000000..9e5f4fd9c3a5
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-usb-ss.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2012-2014,2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018, Linaro Limited
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+#define PHY_CTRL0 0x6C
+#define PHY_CTRL1 0x70
+#define PHY_CTRL2 0x74
+#define PHY_CTRL4 0x7C
+
+/* PHY_CTRL bits */
+#define REF_PHY_EN BIT(0)
+#define LANE0_PWR_ON BIT(2)
+#define SWI_PCS_CLK_SEL BIT(4)
+#define TST_PWR_DOWN BIT(4)
+#define PHY_RESET BIT(7)
+
+#define NUM_BULK_CLKS 3
+#define NUM_BULK_REGS 2
+
+struct ssphy_priv {
+ void __iomem *base;
+ struct device *dev;
+ struct reset_control *reset_com;
+ struct reset_control *reset_phy;
+ struct regulator_bulk_data regs[NUM_BULK_REGS];
+ struct clk_bulk_data clks[NUM_BULK_CLKS];
+ /* optional vbus regulator */
+ struct vbus_regulator {
+ struct regulator *consumer;
+ bool voted; /* regulator balancing: extcon controlled voltage */
+ } vbus;
+ enum phy_mode mode;
+};
+
+static inline void qcom_ssphy_updatel(void __iomem *addr, u32 mask, u32 val)
+{
+ writel((readl(addr) & ~mask) | val, addr);
+}
+
+static inline int qcom_ssphy_vbus_enable(struct vbus_regulator *vbus)
+{
+ struct regulator *consumer = vbus->consumer;
+ int ret;
+
+ if (vbus->voted || !consumer)
+ return 0;
+
+ ret = regulator_enable(consumer);
+ if (!ret) {
+ /* use count only increments on success */
+ vbus->voted = true;
+ }
+
+ return ret;
+}
+
+static inline int qcom_ssphy_vbus_disable(struct vbus_regulator *vbus)
+{
+ struct regulator *consumer = vbus->consumer;
+
+ if (!vbus->voted || !consumer)
+ return 0;
+
+ vbus->voted = false;
+
+ return regulator_disable(consumer);
+}
+
+static int qcom_ssphy_vbus_ctrl(struct vbus_regulator *vbus, enum phy_mode mode)
+{
+ if (mode == PHY_MODE_INVALID)
+ return 0;
+
+ /* gadget attached */
+ if (mode == PHY_MODE_USB_HOST)
+ return qcom_ssphy_vbus_enable(vbus);
+
+ /* USB_DEVICE: gadget removed: enable detection */
+ return qcom_ssphy_vbus_disable(vbus);
+}
+
+static int qcom_ssphy_do_reset(struct ssphy_priv *priv)
+{
+ int ret;
+
+ if (!priv->reset_com) {
+ qcom_ssphy_updatel(priv->base + PHY_CTRL1, PHY_RESET,
+ PHY_RESET);
+ usleep_range(10, 20);
+ qcom_ssphy_updatel(priv->base + PHY_CTRL1, PHY_RESET, 0);
+ } else {
+ ret = reset_control_assert(priv->reset_com);
+ if (ret) {
+ dev_err(priv->dev, "Failed to assert reset com\n");
+ return ret;
+ }
+
+ ret = reset_control_assert(priv->reset_phy);
+ if (ret) {
+ dev_err(priv->dev, "Failed to assert reset phy\n");
+ return ret;
+ }
+
+ usleep_range(10, 20);
+
+ ret = reset_control_deassert(priv->reset_com);
+ if (ret) {
+ dev_err(priv->dev, "Failed to deassert reset com\n");
+ return ret;
+ }
+
+ ret = reset_control_deassert(priv->reset_phy);
+ if (ret) {
+ dev_err(priv->dev, "Failed to deassert reset phy\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int qcom_ssphy_power_on(struct phy *phy)
+{
+ struct ssphy_priv *priv = phy_get_drvdata(phy);
+ int ret;
+
+ ret = regulator_bulk_enable(NUM_BULK_REGS, priv->regs);
+ if (ret)
+ return ret;
+
+ ret = clk_bulk_prepare_enable(NUM_BULK_CLKS, priv->clks);
+ if (ret)
+ goto err_disable_regulator;
+
+ /* depending on the extcon reported mode, enable or disable vbus */
+ ret = qcom_ssphy_vbus_ctrl(&priv->vbus, priv->mode);
+ if (ret)
+ goto err_disable_clock;
+
+ ret = qcom_ssphy_do_reset(priv);
+ if (ret)
+ goto err_disable_vbus;
+
+ writeb(SWI_PCS_CLK_SEL, priv->base + PHY_CTRL0);
+ qcom_ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, LANE0_PWR_ON);
+ qcom_ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, REF_PHY_EN);
+ qcom_ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, 0);
+
+ return 0;
+
+err_disable_vbus:
+ qcom_ssphy_vbus_disable(&priv->vbus);
+err_disable_clock:
+ clk_bulk_disable_unprepare(NUM_BULK_CLKS, priv->clks);
+err_disable_regulator:
+ regulator_bulk_disable(NUM_BULK_REGS, priv->regs);
+
+ return ret;
+}
+
+static int qcom_ssphy_power_off(struct phy *phy)
+{
+ struct ssphy_priv *priv = phy_get_drvdata(phy);
+
+ qcom_ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, 0);
+ qcom_ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, 0);
+ qcom_ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, TST_PWR_DOWN);
+
+ clk_bulk_disable_unprepare(NUM_BULK_CLKS, priv->clks);
+ regulator_bulk_disable(NUM_BULK_REGS, priv->regs);
+ qcom_ssphy_vbus_disable(&priv->vbus);
+
+ return 0;
+}
+
+static int qcom_ssphy_init_clock(struct ssphy_priv *priv)
+{
+ priv->clks[0].id = "ref";
+ priv->clks[1].id = "phy";
+ priv->clks[2].id = "pipe";
+
+ return devm_clk_bulk_get(priv->dev, NUM_BULK_CLKS, priv->clks);
+}
+
+static int qcom_ssphy_init_regulator(struct ssphy_priv *priv)
+{
+ int ret;
+
+ priv->regs[0].supply = "vdd";
+ priv->regs[1].supply = "vdda1p8";
+ ret = devm_regulator_bulk_get(priv->dev, NUM_BULK_REGS, priv->regs);
+ if (ret)
+ return ret;
+
+ priv->vbus.voted = false;
+ priv->vbus.consumer = devm_regulator_get_optional(priv->dev, "vbus");
+ if (IS_ERR(priv->vbus.consumer)) {
+ if (PTR_ERR(priv->vbus.consumer) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ /* regulator_get_optional does not return NULL if not found */
+ priv->vbus.consumer = NULL;
+ }
+
+ return 0;
+}
+
+static int qcom_ssphy_init_reset(struct ssphy_priv *priv)
+{
+ priv->reset_com = devm_reset_control_get_optional(priv->dev, "com");
+ if (IS_ERR(priv->reset_com)) {
+ dev_err(priv->dev, "Failed to get reset control com\n");
+ return PTR_ERR(priv->reset_com);
+ }
+
+ if (priv->reset_com) {
+ /* if reset_com is present, reset_phy is no longer optional */
+ priv->reset_phy = devm_reset_control_get(priv->dev, "phy");
+ if (IS_ERR(priv->reset_phy)) {
+ dev_err(priv->dev, "Failed to get reset control phy\n");
+ return PTR_ERR(priv->reset_phy);
+ }
+ }
+
+ return 0;
+}
+
+static int qcom_ssphy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
+{
+ struct ssphy_priv *priv = phy_get_drvdata(phy);
+
+ if (!priv->vbus.consumer)
+ return 0;
+
+ if (mode != PHY_MODE_USB_HOST && mode != PHY_MODE_USB_DEVICE)
+ return -EINVAL;
+
+ priv->mode = mode;
+ dev_dbg(priv->dev, "mode %d", mode);
+
+ return qcom_ssphy_vbus_ctrl(&priv->vbus, priv->mode);
+}
+
+static const struct phy_ops qcom_ssphy_ops = {
+ .set_mode = qcom_ssphy_set_mode,
+ .power_off = qcom_ssphy_power_off,
+ .power_on = qcom_ssphy_power_on,
+ .owner = THIS_MODULE,
+};
+
+static int qcom_ssphy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct phy_provider *provider;
+ struct ssphy_priv *priv;
+ struct resource *res;
+ struct phy *phy;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(struct ssphy_priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ priv->mode = PHY_MODE_INVALID;
+
+ 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);
+
+ ret = qcom_ssphy_init_clock(priv);
+ if (ret)
+ return ret;
+
+ ret = qcom_ssphy_init_reset(priv);
+ if (ret)
+ return ret;
+
+ ret = qcom_ssphy_init_regulator(priv);
+ if (ret)
+ return ret;
+
+ phy = devm_phy_create(dev, dev->of_node, &qcom_ssphy_ops);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "Failed to create the SS phy\n");
+ 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);
+}
+
+static const struct of_device_id qcom_ssphy_match[] = {
+ { .compatible = "qcom,usb-ssphy", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, qcom_ssphy_match);
+
+static struct platform_driver qcom_ssphy_driver = {
+ .probe = qcom_ssphy_probe,
+ .driver = {
+ .name = "qcom_usb_ssphy",
+ .of_match_table = qcom_ssphy_match,
+ },
+};
+module_platform_driver(qcom_ssphy_driver);
+
+MODULE_DESCRIPTION("Qualcomm SuperSpeed USB PHY driver");
+MODULE_LICENSE("GPL v2");
--
2.20.1
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