lkml.org 
[lkml]   [2013]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC 1/2] usb: phy: Add Qualcomm SS-USB and HS-USB drivers for DWC3 core
Date
From: "Ivan T. Ivanov" <iivanov@mm-sol.com>

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
---
.../devicetree/bindings/usb/msm-ssusb.txt | 49 +++
drivers/usb/phy/Kconfig | 11 +
drivers/usb/phy/Makefile | 2 +
drivers/usb/phy/phy-msm-dwc3-usb2.c | 342 +++++++++++++++++
drivers/usb/phy/phy-msm-dwc3-usb3.c | 389 ++++++++++++++++++++
5 files changed, 793 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/msm-ssusb.txt
create mode 100644 drivers/usb/phy/phy-msm-dwc3-usb2.c
create mode 100644 drivers/usb/phy/phy-msm-dwc3-usb3.c

diff --git a/Documentation/devicetree/bindings/usb/msm-ssusb.txt b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
new file mode 100644
index 0000000..550b496
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
@@ -0,0 +1,49 @@
+MSM SuperSpeed USB3.0 SoC controllers
+
+Required properities :
+- compatible sould be "qcom,dwc3-usb2";
+- reg : offset and length of the register set in the memory map
+- clocks: <&cxo>, <&usb2a_phy_sleep_cxc>;
+- clock-names: "xo", "sleep_a_clk";
+<supply-name>-supply: phandle to the regulator device tree node
+Required "supply-name" examples are:
+ "v1p8" : 1.8v supply for HSPHY
+ "v3p3" : 3.3v supply for HSPHY
+ "vbus" : vbus supply for host mode
+ "vddcx" : vdd supply for HS-PHY digital circuit operation
+
+Required properities :
+- compatible sould be "qcom,dwc3-usb3";
+- reg : offset and length of the register set in the memory map
+- clocks: <&cxo>, <&usb30_mock_utmi_cxc>;
+- clock-names: "xo", "ref_clk";
+<supply-name>-supply: phandle to the regulator device tree node
+Required "supply-name" examples are:
+ "v1p8" : 1.8v supply for SS-PHY
+ "vddcx" : vdd supply for SS-PHY digital circuit operation
+
+Example device nodes:
+
+ dwc3_usb2: phy@f92f8800 {
+ compatible = "qcom,dwc3-usb2";
+ reg = <0xf92f8800 0x30>;
+
+ clocks = <&cxo>, <&usb2a_phy_sleep_cxc>;
+ clock-names = "xo", "sleep_a_clk";
+
+ vbus-supply = <&supply>;
+ vddcx-supply = <&supply>;
+ v1p8-supply = <&supply>;
+ v3p3-supply = <&supply>;
+ };
+
+ dwc3_usb3: phy@f92f8830 {
+ compatible = "qcom,dwc3-usb3";
+ reg = <0xf92f8830 0x30>;
+
+ clocks = <&cxo>, <&usb30_mock_utmi_cxc>;
+ clock-names = "xo", "ref_clk";
+
+ vddcx-supply = <&supply>;
+ v1p8-supply = <&supply>;
+ };
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 5443958..40e83b5 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -202,6 +202,17 @@ config USB_RCAR_PHY
To compile this driver as a module, choose M here: the
module will be called phy-rcar-usb.

+config USB_MSM_DWC3_PHYS
+ tristate "Qualcomm DWC3 USB controller PHY's support"
+ depends on (USB || USB_GADGET) && ARCH_MSM
+ select USB_PHY
+ help
+ Enable this to support the USB PHY transceivers on MSM chips with
+ DWC3 USB core. It handles PHY initialization, clock management
+ required after resetting the hardware and power management.
+ This driver is required even for peripheral only or host only
+ mode configurations.
+
config USB_ULPI
bool "Generic ULPI Transceiver Driver"
depends on ARM
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 98730ca..53355ec 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -24,6 +24,8 @@ obj-$(CONFIG_USB_EHCI_TEGRA) += phy-tegra-usb.o
obj-$(CONFIG_USB_GPIO_VBUS) += phy-gpio-vbus-usb.o
obj-$(CONFIG_USB_ISP1301) += phy-isp1301.o
obj-$(CONFIG_USB_MSM_OTG) += phy-msm-usb.o
+obj-$(CONFIG_USB_MSM_DWC3_PHYS) += phy-msm-dwc3-usb2.o
+obj-$(CONFIG_USB_MSM_DWC3_PHYS) += phy-msm-dwc3-usb3.o
obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o
obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o
obj-$(CONFIG_USB_RCAR_PHY) += phy-rcar-usb.o
diff --git a/drivers/usb/phy/phy-msm-dwc3-usb2.c b/drivers/usb/phy/phy-msm-dwc3-usb2.c
new file mode 100644
index 0000000..174c72c
--- /dev/null
+++ b/drivers/usb/phy/phy-msm-dwc3-usb2.c
@@ -0,0 +1,342 @@
+/* Copyright (c) 2013, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ */
+
+#undef CONFIG_REGULATOR
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb/phy.h>
+
+/**
+ * USB QSCRATCH Hardware registers
+ */
+#define QSCRATCH_CTRL_REG (0x04)
+#define QSCRATCH_GENERAL_CFG (0x08)
+#define PHY_CTRL_REG (0x10)
+#define PARAMETER_OVERRIDE_X_REG (0x14)
+#define CHARGING_DET_CTRL_REG (0x18)
+#define CHARGING_DET_OUTPUT_REG (0x1c)
+#define ALT_INTERRUPT_EN_REG (0x20)
+#define PHY_IRQ_STAT_REG (0x24)
+#define CGCTL_REG (0x28)
+
+#define PHY_3P3_VOL_MIN 3050000 /* uV */
+#define PHY_3P3_VOL_MAX 3300000 /* uV */
+#define PHY_3P3_HPM_LOAD 16000 /* uA */
+
+#define PHY_1P8_VOL_MIN 1800000 /* uV */
+#define PHY_1P8_VOL_MAX 1800000 /* uV */
+#define PHY_1P8_HPM_LOAD 19000 /* uA */
+
+/* TODO: these are suspicious */
+#define USB_VDDCX_NO 1 /* uV */
+#define USB_VDDCX_MIN 5 /* uV */
+#define USB_VDDCX_MAX 7 /* uV */
+
+struct msm_dwc3_usb2_phy {
+ struct usb_phy phy;
+ void __iomem *base;
+ struct device *dev;
+
+ struct clk *xo_clk;
+ struct clk *sleep_a_clk;
+
+ struct regulator *v3p3;
+ struct regulator *v1p8;
+ struct regulator *vddcx;
+ struct regulator *vbus;
+};
+
+#define phy_to_dwc3_phy(x) container_of((x), struct msm_dwc3_usb2_phy, phy)
+
+
+/**
+ *
+ * Write register with debug info.
+ *
+ * @base - DWC3 base virtual address.
+ * @offset - register offset.
+ * @val - value to write.
+ *
+ */
+static inline void msm_dwc3_usb2_write(void *base, u32 offset, u32 val)
+{
+ iowrite32(val, base + offset);
+}
+
+/**
+ * Write register and read back masked value to confirm it is written
+ *
+ * @base - DWC3 base virtual address.
+ * @offset - register offset.
+ * @mask - register bitmask specifying what should be updated
+ * @val - value to write.
+ *
+ */
+static inline void msm_dwc3_usb2_write_readback(void *base, u32 offset,
+ const u32 mask, u32 val)
+{
+ u32 write_val, tmp = ioread32(base + offset);
+
+ tmp &= ~mask; /* retain other bits */
+ write_val = tmp | val;
+
+ iowrite32(write_val, base + offset);
+
+ /* Read back to see if val was written */
+ tmp = ioread32(base + offset);
+ tmp &= mask; /* clear other bits */
+
+ if (tmp != val)
+ pr_err("write: %x to QSCRATCH: %x FAILED\n", val, offset);
+}
+
+static void msm_dwc3_usb2_phy_shutdown(struct usb_phy *x)
+{
+ struct msm_dwc3_usb2_phy *phy = phy_to_dwc3_phy(x);
+ int ret;
+
+ ret = regulator_set_voltage(phy->v3p3, 0, PHY_3P3_VOL_MAX);
+ if (ret)
+ dev_err(phy->dev, "unable to set voltage for v3p3\n");
+
+ ret = regulator_set_voltage(phy->v1p8, 0, PHY_1P8_VOL_MAX);
+ if (ret)
+ dev_err(phy->dev, "unable to set voltage for v1p8\n");
+
+ ret = regulator_disable(phy->v1p8);
+ if (ret)
+ dev_err(phy->dev, "cannot disable v1p8\n");
+
+ ret = regulator_disable(phy->v3p3);
+ if (ret)
+ dev_err(phy->dev, "cannot disable v3p3\n");
+
+ ret = regulator_set_voltage(phy->vddcx, USB_VDDCX_NO, USB_VDDCX_MAX);
+ if (ret)
+ dev_err(phy->dev, "unable to set voltage for vddcx\n");
+
+ ret = regulator_disable(phy->vddcx);
+ if (ret)
+ dev_err(phy->dev, "unable to enable the vddcx\n");
+
+ clk_disable_unprepare(phy->sleep_a_clk);
+}
+
+static int msm_dwc3_usb2_phy_init(struct usb_phy *x)
+{
+ struct msm_dwc3_usb2_phy *phy = phy_to_dwc3_phy(x);
+ int ret;
+
+ clk_prepare_enable(phy->sleep_a_clk);
+
+ ret = regulator_set_voltage(phy->vddcx, USB_VDDCX_MIN, USB_VDDCX_MAX);
+ if (ret) {
+ dev_err(phy->dev, "unable to set voltage for vddcx\n");
+ return ret;
+ }
+
+ ret = regulator_enable(phy->vddcx);
+ if (ret) {
+ dev_err(phy->dev, "unable to enable the vddcx\n");
+ return ret;
+ }
+
+ ret = regulator_set_voltage(phy->v3p3, PHY_3P3_VOL_MIN,
+ PHY_3P3_VOL_MAX);
+ if (ret) {
+ dev_err(phy->dev, "unable to set voltage for v3p3\n");
+ return ret;
+ }
+
+ ret = regulator_set_voltage(phy->v1p8, PHY_1P8_VOL_MIN,
+ PHY_1P8_VOL_MAX);
+ if (ret) {
+ dev_err(phy->dev, "unable to set voltage for v1p8\n");
+ return ret;
+ }
+
+ ret = regulator_set_optimum_mode(phy->v1p8, PHY_1P8_HPM_LOAD);
+ if (ret < 0) {
+ dev_err(phy->dev, "unable to set HPM of regulator v1p8\n");
+ return ret;
+ }
+
+ ret = regulator_enable(phy->v1p8);
+ if (ret) {
+ dev_err(phy->dev, "unable to enable v1p8\n");
+ return ret;
+ }
+
+ ret = regulator_set_optimum_mode(phy->v3p3, PHY_3P3_HPM_LOAD);
+ if (ret < 0) {
+ dev_err(phy->dev, "unable to set HPM of regulator v3p3\n");
+ return ret;
+ }
+
+ ret = regulator_enable(phy->v3p3);
+ if (ret) {
+ dev_err(phy->dev, "unable to enable v3p3\n");
+ return ret;
+ }
+
+ /*
+ * HSPHY Initialization: Enable UTMI clock and clamp enable HVINTs,
+ * and disable RETENTION (power-on default is ENABLED)
+ */
+ msm_dwc3_usb2_write(phy->base, PHY_CTRL_REG, 0x5220bb2);
+ usleep_range(2000, 2200);
+
+ /*
+ * write HSPHY init value to QSCRATCH reg to set HSPHY parameters like
+ * VBUS valid threshold, disconnect valid threshold, DC voltage level,
+ * preempasis and rise/fall time.
+ */
+ msm_dwc3_usb2_write_readback(phy->base, PARAMETER_OVERRIDE_X_REG,
+ 0x03ffffff, 0x00d191a4);
+
+ /* Disable (bypass) VBUS and ID filters */
+ msm_dwc3_usb2_write(phy->base, QSCRATCH_GENERAL_CFG, 0x78);
+
+ return 0;
+}
+
+static int msm_dwc3_usb2_phy_set_vbus(struct usb_phy *x, int on)
+{
+ struct msm_dwc3_usb2_phy *phy = phy_to_dwc3_phy(x);
+ int ret;
+
+ if (on)
+ ret = regulator_enable(phy->vbus);
+ else
+ ret = regulator_disable(phy->vbus);
+
+ if (ret)
+ dev_err(x->dev, "Cannot %s Vbus\n", on ? "set" : "off");
+ return ret;
+}
+
+static int msm_dwc3_usb2_probe(struct platform_device *pdev)
+{
+ struct msm_dwc3_usb2_phy *phy;
+ struct resource *res;
+ void __iomem *base;
+
+ dev_info(&pdev->dev, "MSM DWC3 HS-PHY\n");
+
+ phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy) {
+ dev_err(&pdev->dev, "no alloc mem for MSM DWC3 HS-PHY\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, phy);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ phy->vddcx = devm_regulator_get(&pdev->dev, "vddcx");
+ if (IS_ERR(phy->vddcx)) {
+ dev_err(&pdev->dev, "unable to get vddcx\n");
+ return PTR_ERR(phy->vddcx);
+ }
+
+ phy->v3p3 = devm_regulator_get(phy->dev, "v3p3");
+ if (IS_ERR(phy->v3p3)) {
+ dev_err(phy->dev, "unable to get v3p3\n");
+ return PTR_ERR(phy->v3p3);
+ }
+
+ phy->v1p8 = devm_regulator_get(phy->dev, "v1p8");
+ if (IS_ERR(phy->v1p8)) {
+ dev_err(phy->dev, "unable to get v1p8\n");
+ return PTR_ERR(phy->v1p8);
+ }
+
+ phy->vbus = devm_regulator_get(&pdev->dev, "vbus");
+ if (IS_ERR(phy->vbus)) {
+ dev_err(phy->dev, "Failed to get vbus\n");
+ return PTR_ERR(phy->vbus);
+ }
+
+ phy->xo_clk = devm_clk_get(&pdev->dev, "xo");
+ if (IS_ERR(phy->xo_clk)) {
+ dev_err(&pdev->dev, "unable to get TCXO buffer handle\n");
+ return PTR_ERR(phy->xo_clk);
+ }
+
+ phy->sleep_a_clk = devm_clk_get(&pdev->dev, "sleep_a_clk");
+ if (IS_ERR(phy->sleep_a_clk)) {
+ dev_err(&pdev->dev, "failed to get sleep_a_clk\n");
+ return PTR_ERR(phy->sleep_a_clk);
+ }
+
+ clk_prepare_enable(phy->xo_clk);
+
+ phy->dev = &pdev->dev;
+ phy->base = base;
+ phy->phy.dev = phy->dev;
+ phy->phy.label = "msm-dwc3-usb2";
+ phy->phy.init = msm_dwc3_usb2_phy_init;
+ phy->phy.shutdown = msm_dwc3_usb2_phy_shutdown;
+ phy->phy.set_vbus = msm_dwc3_usb2_phy_set_vbus;
+ phy->phy.type = USB_PHY_TYPE_USB2;
+ phy->phy.state = OTG_STATE_UNDEFINED;
+
+ usb_add_phy_dev(&phy->phy);
+
+ return 0;
+}
+
+static int msm_dwc3_usb2_remove(struct platform_device *pdev)
+{
+ struct msm_dwc3_usb2_phy *phy = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(phy->xo_clk);
+ usb_remove_phy(&phy->phy);
+ return 0;
+}
+
+static const struct of_device_id msm_dwc3_usb2_id_table[] = {
+ { .compatible = "qcom,dwc3-usb2" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, msm_dwc3_usb2_id_table);
+
+static struct platform_driver msm_dwc3_usb2_driver = {
+ .probe = msm_dwc3_usb2_probe,
+ .remove = msm_dwc3_usb2_remove,
+ .driver = {
+ .name = "msm-dwc3-usb2",
+ .owner = THIS_MODULE,
+ .of_match_table = msm_dwc3_usb2_id_table,
+ },
+};
+
+module_platform_driver(msm_dwc3_usb2_driver);
+
+MODULE_ALIAS("platform:msm_dwc3_usb2");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 MSM HS-PHY driver");
diff --git a/drivers/usb/phy/phy-msm-dwc3-usb3.c b/drivers/usb/phy/phy-msm-dwc3-usb3.c
new file mode 100644
index 0000000..f7bafff
--- /dev/null
+++ b/drivers/usb/phy/phy-msm-dwc3-usb3.c
@@ -0,0 +1,389 @@
+/* Copyright (c) 2013, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ */
+
+#undef CONFIG_REGULATOR
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb/phy.h>
+
+/**
+ * USB QSCRATCH Hardware registers
+ */
+#define PHY_CTRL_REG (0x00)
+#define PHY_PARAM_CTRL_1 (0x04)
+#define PHY_PARAM_CTRL_2 (0x08)
+#define CR_PROTOCOL_DATA_IN_REG (0x0c)
+#define CR_PROTOCOL_DATA_OUT_REG (0x10)
+#define CR_PROTOCOL_CAP_ADDR_REG (0x14)
+#define CR_PROTOCOL_CAP_DATA_REG (0x18)
+#define CR_PROTOCOL_READ_REG (0x1c)
+#define CR_PROTOCOL_WRITE_REG (0x20)
+
+#define PHY_1P8_VOL_MIN 1800000 /* uV */
+#define PHY_1P8_VOL_MAX 1800000 /* uV */
+#define PHY_1P8_HPM_LOAD 23000 /* uA */
+
+/* TODO: these are suspicious */
+#define USB_VDDCX_NO 1 /* uV */
+#define USB_VDDCX_MIN 5 /* uV */
+#define USB_VDDCX_MAX 7 /* uV */
+
+struct msm_dwc3_usb3_phy {
+ struct usb_phy phy;
+ void __iomem *base;
+ struct device *dev;
+
+ struct regulator *v1p8;
+ struct regulator *vddcx;
+
+ struct clk *xo_clk;
+ struct clk *ref_clk;
+};
+
+#define phy_to_dwc3_phy(x) container_of((x), struct msm_dwc3_usb3_phy, phy)
+
+
+/**
+ *
+ * Write register with debug info.
+ *
+ * @base - DWC3 base virtual address.
+ * @offset - register offset.
+ * @val - value to write.
+ *
+ */
+static inline void msm_dwc3_usb3_write(void *base, u32 offset, u32 val)
+{
+ iowrite32(val, base + offset);
+}
+
+/**
+ * Write register and read back masked value to confirm it is written
+ *
+ * @base - DWC3 base virtual address.
+ * @offset - register offset.
+ * @mask - register bitmask specifying what should be updated
+ * @val - value to write.
+ *
+ */
+static inline void msm_dwc3_usb3_write_readback(void *base, u32 offset,
+ const u32 mask, u32 val)
+{
+ u32 write_val, tmp = ioread32(base + offset);
+
+ tmp &= ~mask; /* retain other bits */
+ write_val = tmp | val;
+
+ iowrite32(write_val, base + offset);
+
+ /* Read back to see if val was written */
+ tmp = ioread32(base + offset);
+ tmp &= mask; /* clear other bits */
+
+ if (tmp != val)
+ pr_err("write: %x to QSCRATCH: %x FAILED\n", val, offset);
+}
+
+/**
+ *
+ * Write SSPHY register with debug info.
+ *
+ * @base - DWC3 base virtual address.
+ * @addr - SSPHY address to write.
+ * @val - value to write.
+ *
+ */
+static void msm_dwc3_usb3_write_phycreg(void *base, u32 addr, u32 val)
+{
+ iowrite32(addr, base + CR_PROTOCOL_DATA_IN_REG);
+ iowrite32(0x1, base + CR_PROTOCOL_CAP_ADDR_REG);
+ while (ioread32(base + CR_PROTOCOL_CAP_ADDR_REG))
+ cpu_relax();
+
+ iowrite32(val, base + CR_PROTOCOL_DATA_IN_REG);
+ iowrite32(0x1, base + CR_PROTOCOL_CAP_DATA_REG);
+ while (ioread32(base + CR_PROTOCOL_CAP_DATA_REG))
+ cpu_relax();
+
+ iowrite32(0x1, base + CR_PROTOCOL_WRITE_REG);
+ while (ioread32(base + CR_PROTOCOL_WRITE_REG))
+ cpu_relax();
+}
+
+/**
+ *
+ * Read SSPHY register with debug info.
+ *
+ * @base - DWC3 base virtual address.
+ * @addr - SSPHY address to read.
+ *
+ */
+static u32 msm_dwc3_usb3_read_phycreg(void *base, u32 addr)
+{
+ bool first_read = true;
+
+ iowrite32(addr, base + CR_PROTOCOL_DATA_IN_REG);
+ iowrite32(0x1, base + CR_PROTOCOL_CAP_ADDR_REG);
+ while (ioread32(base + CR_PROTOCOL_CAP_ADDR_REG))
+ cpu_relax();
+
+ /*
+ * Due to hardware bug, first read of SSPHY register might be
+ * incorrect. Hence as workaround, SW should perform SSPHY register
+ * read twice, but use only second read and ignore first read.
+ */
+retry:
+ iowrite32(0x1, base + CR_PROTOCOL_READ_REG);
+ while (ioread32(base + CR_PROTOCOL_READ_REG))
+ cpu_relax();
+
+ if (first_read) {
+ ioread32(base + CR_PROTOCOL_DATA_OUT_REG);
+ first_read = false;
+ goto retry;
+ }
+
+ return ioread32(base + CR_PROTOCOL_DATA_OUT_REG);
+}
+
+static void msm_dwc3_usb3_phy_shutdown(struct usb_phy *x)
+{
+ struct msm_dwc3_usb3_phy *phy = phy_to_dwc3_phy(x);
+ int ret;
+
+ /* Sequence to put SSPHY in low power state:
+ * 1. Clear REF_PHY_EN in PHY_CTRL_REG
+ * 2. Clear REF_USE_PAD in PHY_CTRL_REG
+ * 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY retention
+ * 4. Disable SSPHY ref clk
+ */
+ msm_dwc3_usb3_write_readback(phy->base, PHY_CTRL_REG, (1 << 8), 0x0);
+ msm_dwc3_usb3_write_readback(phy->base, PHY_CTRL_REG, (1 << 28), 0x0);
+ msm_dwc3_usb3_write_readback(phy->base, PHY_CTRL_REG,
+ (1 << 26), (1 << 26));
+
+ usleep_range(1000, 1200);
+ clk_disable_unprepare(phy->ref_clk);
+
+ ret = regulator_set_voltage(phy->vddcx, USB_VDDCX_NO, USB_VDDCX_MAX);
+ if (ret)
+ dev_err(phy->dev, "unable to set voltage for vddcx\n");
+
+ regulator_disable(phy->vddcx);
+
+ ret = regulator_set_voltage(phy->v1p8, 0, PHY_1P8_VOL_MAX);
+ if (ret)
+ dev_err(phy->dev, "unable to set v1p8\n");
+
+ regulator_disable(phy->v1p8);
+}
+
+static int msm_dwc3_usb3_phy_init(struct usb_phy *x)
+{
+ struct msm_dwc3_usb3_phy *phy = phy_to_dwc3_phy(x);
+ u32 data = 0;
+ int ret;
+
+ ret = regulator_set_voltage(phy->vddcx, USB_VDDCX_MIN, USB_VDDCX_MAX);
+ if (ret) {
+ dev_err(phy->dev, "unable to set voltage for vddcx\n");
+ return ret;
+ }
+
+ ret = regulator_enable(phy->vddcx);
+ if (ret) {
+ dev_err(phy->dev, "cannot enable the vddcx\n");
+ return ret;
+ }
+
+ ret = regulator_set_voltage(phy->v1p8, PHY_1P8_VOL_MIN,
+ PHY_1P8_VOL_MAX);
+ if (ret) {
+ regulator_disable(phy->vddcx);
+ dev_err(phy->dev, "unable to set v1p8\n");
+ return ret;
+ }
+
+ ret = regulator_enable(phy->v1p8);
+ if (ret) {
+ regulator_disable(phy->vddcx);
+ dev_err(phy->dev, "cannot enable the v1p8\n");
+ return ret;
+ }
+
+ clk_prepare_enable(phy->ref_clk);
+ usleep_range(1000, 1200);
+
+ /* SSPHY Initialization: Use ref_clk from pads and set its parameters */
+ msm_dwc3_usb3_write(phy->base, PHY_CTRL_REG, 0x10210002);
+ msleep(30);
+ /* Assert SSPHY reset */
+ msm_dwc3_usb3_write(phy->base, PHY_CTRL_REG, 0x10210082);
+ usleep_range(2000, 2200);
+ /* De-assert SSPHY reset - power and ref_clock must be ON */
+ msm_dwc3_usb3_write(phy->base, PHY_CTRL_REG, 0x10210002);
+ usleep_range(2000, 2200);
+ /* Ref clock must be stable now, enable ref clock for HS mode */
+ msm_dwc3_usb3_write(phy->base, PHY_CTRL_REG, 0x10210102);
+ usleep_range(2000, 2200);
+
+ /*
+ * WORKAROUND: There is SSPHY suspend bug due to which USB enumerates
+ * in HS mode instead of SS mode. Workaround it by asserting
+ * LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus mode
+ */
+ data = msm_dwc3_usb3_read_phycreg(phy->base, 0x102d);
+ data |= (1 << 7);
+ msm_dwc3_usb3_write_phycreg(phy->base, 0x102D, data);
+
+ data = msm_dwc3_usb3_read_phycreg(phy->base, 0x1010);
+ data &= ~0xff0;
+ data |= 0x20;
+ msm_dwc3_usb3_write_phycreg(phy->base, 0x1010, data);
+
+ /*
+ * Fix RX Equalization setting as follows
+ * LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
+ * LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
+ * LANE0.RX_OVRD_IN_HI.RX_EQ set to 3
+ * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
+ */
+ data = msm_dwc3_usb3_read_phycreg(phy->base, 0x1006);
+ data &= ~(1 << 6);
+ data |= (1 << 7);
+ data &= ~(0x7 << 8);
+ data |= (0x3 << 8);
+ data |= (0x1 << 11);
+ msm_dwc3_usb3_write_phycreg(phy->base, 0x1006, data);
+
+ /*
+ * Set EQ and TX launch amplitudes as follows
+ * LANE0.TX_OVRD_DRV_LO.PREEMPH set to 22
+ * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 127
+ * LANE0.TX_OVRD_DRV_LO.EN set to 1.
+ */
+ data = msm_dwc3_usb3_read_phycreg(phy->base, 0x1002);
+ data &= ~0x3f80;
+ data |= (0x16 << 7);
+ data &= ~0x7f;
+ data |= (0x7f | (1 << 14));
+ msm_dwc3_usb3_write_phycreg(phy->base, 0x1002, data);
+
+ /*
+ * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
+ * TX_FULL_SWING [26:20] amplitude to 127
+ * TX_DEEMPH_3_5DB [13:8] to 22
+ * LOS_BIAS [2:0] to 0x5
+ */
+ msm_dwc3_usb3_write_readback(phy->base, PHY_PARAM_CTRL_1,
+ 0x07f03f07, 0x07f01605);
+ return 0;
+}
+
+static int msm_dwc3_usb3_probe(struct platform_device *pdev)
+{
+ struct msm_dwc3_usb3_phy *phy;
+ struct resource *res;
+ void __iomem *base;
+
+ dev_info(&pdev->dev, "MSM DWC3 SS-PHY\n");
+
+ phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy) {
+ dev_err(&pdev->dev, "no mem for MSM DWC3 SS-PHY\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, phy);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ phy->vddcx = devm_regulator_get(phy->dev, "vddcx");
+ if (IS_ERR(phy->vddcx))
+ return -EPROBE_DEFER;
+
+ phy->v1p8 = devm_regulator_get(phy->dev, "v1p8");
+ if (IS_ERR(phy->v1p8))
+ return -EPROBE_DEFER;
+
+ phy->xo_clk = devm_clk_get(&pdev->dev, "xo");
+ if (IS_ERR(phy->xo_clk)) {
+ dev_err(&pdev->dev, "unable to get TCXO buffer handle\n");
+ return PTR_ERR(phy->xo_clk);
+ }
+
+ phy->ref_clk = devm_clk_get(&pdev->dev, "ref_clk");
+ if (IS_ERR(phy->ref_clk)) {
+ dev_err(&pdev->dev, "unable to get ref_clk handle\n");
+ return PTR_ERR(phy->ref_clk);
+ }
+
+ clk_prepare_enable(phy->xo_clk);
+
+ phy->dev = &pdev->dev;
+ phy->base = base;
+ phy->phy.dev = phy->dev;
+ phy->phy.label = "msm-dwc3-usb3";
+ phy->phy.init = msm_dwc3_usb3_phy_init;
+ phy->phy.shutdown = msm_dwc3_usb3_phy_shutdown;
+ phy->phy.type = USB_PHY_TYPE_USB3;
+
+ usb_add_phy_dev(&phy->phy);
+
+ return 0;
+}
+
+static int msm_dwc3_usb3_remove(struct platform_device *pdev)
+{
+ struct msm_dwc3_usb3_phy *phy = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(phy->xo_clk);
+ usb_remove_phy(&phy->phy);
+ return 0;
+}
+
+static const struct of_device_id msm_dwc3_usb3_id_table[] = {
+ { .compatible = "qcom,dwc3-usb3" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, msm_dwc3_usb3_id_table);
+
+static struct platform_driver msm_dwc3_usb3_driver = {
+ .probe = msm_dwc3_usb3_probe,
+ .remove = msm_dwc3_usb3_remove,
+ .driver = {
+ .name = "msm-dwc3-usb3",
+ .owner = THIS_MODULE,
+ .of_match_table = msm_dwc3_usb3_id_table,
+ },
+};
+
+module_platform_driver(msm_dwc3_usb3_driver);
+
+MODULE_ALIAS("platform:msm_dwc3_usb3");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 MSM SS-PHY driver");
--
1.7.9.5


\
 
 \ /
  Last update: 2013-08-06 14:21    [W:0.130 / U:1.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site