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Subject[PATCH 3/4] USB: Palmas OTG Transceiver Driver
Date
From: Graeme Gregory <gg@slimlogic.co.uk>

This is the driver for the OTG transceiver built into the Palmas chip. It
handles the various USB OTG events that can be generated by cable
insertion/removal.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Moiz Sonasath <m-sonasath@ti.com>
Signed-off-by: Ruchika Kharwar <ruchika@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sebastien Guiriec <s-guiriec@ti.com>
---
This driver is contributed by a lot of people fixing various issues that
came along. All the fixes has been squashed into this single patch.
I've included their *Signed-off-by*.
.../devicetree/bindings/usb/twlxxxx-usb.txt | 15 +
drivers/usb/otg/Kconfig | 6 +
drivers/usb/otg/Makefile | 1 +
drivers/usb/otg/palmas-usb.c | 399 ++++++++++++++++++++
include/linux/mfd/palmas.h | 7 +-
5 files changed, 427 insertions(+), 1 deletion(-)
create mode 100644 drivers/usb/otg/palmas-usb.c

diff --git a/Documentation/devicetree/bindings/usb/twlxxxx-usb.txt b/Documentation/devicetree/bindings/usb/twlxxxx-usb.txt
index 36b9aed..6d941ef 100644
--- a/Documentation/devicetree/bindings/usb/twlxxxx-usb.txt
+++ b/Documentation/devicetree/bindings/usb/twlxxxx-usb.txt
@@ -38,3 +38,18 @@ twl4030-usb {
usb3v1-supply = <&vusb3v1>;
usb_mode = <1>;
};
+
+PALMAS USB COMPARATOR
+Required Properties:
+ - compatible : Should be "ti,palmas-usb"
+ - vbus-supply : phandle to the regulator device tree node.
+
+Optional Properties:
+ - ti,wakeup : To enable the wakeup comparator in probe
+ - ti,no_control_vbus: if the platform wishes its own vbus control
+
+palmas-usb {
+ compatible = "ti,palmas-usb";
+ vbus-supply = <&smps10_reg>;
+ ti,wakeup;
+};
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index 37962c9..5b40e04 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -138,4 +138,10 @@ config USB_MV_OTG

To compile this driver as a module, choose M here.

+config PALMAS_USB
+ tristate "Palmas USB Transceiver Driver"
+ depends on MFD_PALMAS
+ help
+ Enable this to support the Palmas OTG transceiver
+
endif # USB || OTG
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index a844b8d..7ae90ba 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -22,3 +22,4 @@ fsl_usb2_otg-objs := fsl_otg.o otg_fsm.o
obj-$(CONFIG_FSL_USB2_OTG) += fsl_usb2_otg.o
obj-$(CONFIG_USB_MXS_PHY) += mxs-phy.o
obj-$(CONFIG_USB_MV_OTG) += mv_otg.o
+obj-$(CONFIG_PALMAS_USB) += palmas-usb.o
diff --git a/drivers/usb/otg/palmas-usb.c b/drivers/usb/otg/palmas-usb.c
new file mode 100644
index 0000000..1bd8d7e
--- /dev/null
+++ b/drivers/usb/otg/palmas-usb.c
@@ -0,0 +1,399 @@
+/*
+ * Palmas USB transceiver driver
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ *
+ * Based on twl6030_usb.c
+ *
+ * Author: Hema HK <hemahk@ti.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/phy_companion.h>
+#include <linux/usb/omap_usb.h>
+#include <linux/usb/dwc3-omap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/notifier.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/mfd/palmas.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+
+static int palmas_usb_read(struct palmas *palmas, unsigned int reg,
+ unsigned int *dest)
+{
+ unsigned int addr;
+ int slave;
+
+ slave = PALMAS_BASE_TO_SLAVE(PALMAS_USB_OTG_BASE);
+ addr = PALMAS_BASE_TO_REG(PALMAS_USB_OTG_BASE, reg);
+
+ return regmap_read(palmas->regmap[slave], addr, dest);
+}
+
+static int palmas_usb_write(struct palmas *palmas, unsigned int reg,
+ unsigned int data)
+{
+ unsigned int addr;
+ int slave;
+
+ slave = PALMAS_BASE_TO_SLAVE(PALMAS_USB_OTG_BASE);
+ addr = PALMAS_BASE_TO_REG(PALMAS_USB_OTG_BASE, reg);
+
+ return regmap_write(palmas->regmap[slave], addr, data);
+}
+
+static void palmas_usb_wakeup(struct palmas *palmas, int enable)
+{
+ if (enable)
+ palmas_usb_write(palmas, PALMAS_USB_WAKEUP,
+ PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
+ else
+ palmas_usb_write(palmas, PALMAS_USB_WAKEUP, 0);
+}
+
+static ssize_t palmas_usb_vbus_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long flags;
+ int ret = -EINVAL;
+ struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
+
+ spin_lock_irqsave(&palmas_usb->lock, flags);
+
+ switch (palmas_usb->linkstat) {
+ case OMAP_DWC3_VBUS_VALID:
+ ret = snprintf(buf, PAGE_SIZE, "vbus\n");
+ break;
+ case OMAP_DWC3_ID_GROUND:
+ ret = snprintf(buf, PAGE_SIZE, "id\n");
+ break;
+ case OMAP_DWC3_ID_FLOAT:
+ case OMAP_DWC3_VBUS_OFF:
+ ret = snprintf(buf, PAGE_SIZE, "none\n");
+ break;
+ default:
+ ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
+ }
+ spin_unlock_irqrestore(&palmas_usb->lock, flags);
+
+ return ret;
+}
+static DEVICE_ATTR(vbus, 0444, palmas_usb_vbus_show, NULL);
+
+static irqreturn_t palmas_vbus_wakeup_irq(int irq, void *_palmas_usb)
+{
+ struct palmas_usb *palmas_usb = _palmas_usb;
+ enum omap_dwc3_vbus_id_status status = OMAP_DWC3_UNKNOWN;
+ int slave;
+ unsigned int vbus_line_state, addr;
+
+ slave = PALMAS_BASE_TO_SLAVE(PALMAS_INTERRUPT_BASE);
+ addr = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
+ PALMAS_INT3_LINE_STATE);
+
+ regmap_read(palmas_usb->palmas->regmap[slave], addr, &vbus_line_state);
+
+ if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
+ if (palmas_usb->linkstat != OMAP_DWC3_VBUS_VALID) {
+ if (!IS_ERR_OR_NULL(palmas_usb->vbus_reg))
+ regulator_enable(palmas_usb->vbus_reg);
+ status = OMAP_DWC3_VBUS_VALID;
+ } else {
+ dev_dbg(palmas_usb->dev,
+ "Spurious connect event detected\n");
+ }
+ } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
+ if (palmas_usb->linkstat == OMAP_DWC3_VBUS_VALID) {
+ if (!IS_ERR_OR_NULL(palmas_usb->vbus_reg))
+ regulator_disable(palmas_usb->vbus_reg);
+ status = OMAP_DWC3_VBUS_OFF;
+ } else {
+ dev_dbg(palmas_usb->dev,
+ "Spurious disconnect event detected\n");
+ }
+ }
+
+ palmas_usb->linkstat = status;
+ if (status != OMAP_DWC3_UNKNOWN)
+ return dwc3_omap_mailbox(status);
+
+ return IRQ_NONE;
+}
+
+static irqreturn_t palmas_id_wakeup_irq(int irq, void *_palmas_usb)
+{
+ enum omap_dwc3_vbus_id_status status = OMAP_DWC3_UNKNOWN;
+ unsigned int set;
+ struct palmas_usb *palmas_usb = _palmas_usb;
+
+ palmas_usb_read(palmas_usb->palmas, PALMAS_USB_ID_INT_LATCH_SET, &set);
+
+ if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
+ if (!IS_ERR_OR_NULL(palmas_usb->vbus_reg))
+ regulator_enable(palmas_usb->vbus_reg);
+ palmas_usb_write(palmas_usb->palmas,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
+ palmas_usb_write(palmas_usb->palmas,
+ PALMAS_USB_ID_INT_EN_HI_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
+ status = OMAP_DWC3_ID_GROUND;
+ } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
+ palmas_usb_write(palmas_usb->palmas,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+ palmas_usb_write(palmas_usb->palmas,
+ PALMAS_USB_ID_INT_EN_HI_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
+ if (!IS_ERR_OR_NULL(palmas_usb->vbus_reg))
+ regulator_disable(palmas_usb->vbus_reg);
+ status = OMAP_DWC3_ID_FLOAT;
+ }
+
+ palmas_usb->linkstat = status;
+ if (status != OMAP_DWC3_UNKNOWN)
+ return dwc3_omap_mailbox(status);
+
+ return IRQ_NONE;
+}
+
+static int palmas_enable_irq(struct palmas_usb *palmas_usb)
+{
+ int ret;
+
+ palmas_usb_write(palmas_usb->palmas, PALMAS_USB_VBUS_CTRL_SET,
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
+
+ palmas_usb_write(palmas_usb->palmas, PALMAS_USB_ID_CTRL_SET,
+ PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
+
+ palmas_usb_write(palmas_usb->palmas, PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+
+ ret = palmas_vbus_wakeup_irq(palmas_usb->irq4, palmas_usb);
+
+ if (palmas_usb->linkstat == OMAP_DWC3_UNKNOWN)
+ ret = palmas_id_wakeup_irq(palmas_usb->irq2, palmas_usb);
+
+ return ret;
+}
+
+static void palmas_set_vbus_work(struct work_struct *data)
+{
+ struct palmas_usb *palmas_usb = container_of(data, struct palmas_usb,
+ set_vbus_work);
+
+ if (IS_ERR_OR_NULL(palmas_usb->vbus_reg)) {
+ dev_err(palmas_usb->dev, "invalid regulator\n");
+ return;
+ }
+
+ /*
+ * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
+ * register. This enables boost mode.
+ */
+
+ if (palmas_usb->vbus_enable)
+ regulator_enable(palmas_usb->vbus_reg);
+ else
+ regulator_disable(palmas_usb->vbus_reg);
+}
+
+static int palmas_set_vbus(struct phy_companion *comparator, bool enabled)
+{
+ struct palmas_usb *palmas_usb = comparator_to_palmas(comparator);
+
+ palmas_usb->vbus_enable = enabled;
+ schedule_work(&palmas_usb->set_vbus_work);
+
+ return 0;
+}
+
+static int palmas_start_srp(struct phy_companion *comparator)
+{
+ struct palmas_usb *palmas_usb = comparator_to_palmas(comparator);
+
+ palmas_usb_write(palmas_usb->palmas, PALMAS_USB_VBUS_CTRL_SET,
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_DISCHRG |
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_IADP_SINK);
+ palmas_usb_write(palmas_usb->palmas, PALMAS_USB_VBUS_CTRL_SET,
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_CHRG_VSYS |
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_IADP_SINK);
+
+ mdelay(100);
+
+ palmas_usb_write(palmas_usb->palmas, PALMAS_USB_VBUS_CTRL_CLR,
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_CHRG_VSYS |
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_CHRG_VSYS);
+
+ return 0;
+}
+
+static void palmas_dt_to_pdata(struct device_node *node,
+ struct palmas_usb_platform_data *pdata)
+{
+ pdata->no_control_vbus = of_property_read_bool(node,
+ "ti,no_control_vbus");
+ pdata->wakeup = of_property_read_bool(node, "ti,wakeup");
+}
+
+static int palmas_usb_probe(struct platform_device *pdev)
+{
+ u32 ret;
+ struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
+ struct palmas_usb_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *node = pdev->dev.of_node;
+ struct palmas_usb *palmas_usb;
+ int status;
+
+ if (node && !pdata) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+
+ if (!pdata)
+ return -ENOMEM;
+
+ palmas_dt_to_pdata(node, pdata);
+ }
+
+ if (!pdata)
+ return -EINVAL;
+
+ palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
+ if (!palmas_usb)
+ return -ENOMEM;
+
+ palmas->usb = palmas_usb;
+ palmas_usb->palmas = palmas;
+
+ palmas_usb->dev = &pdev->dev;
+
+ palmas_usb->irq1 = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_ID_OTG_IRQ);
+ palmas_usb->irq2 = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_ID_IRQ);
+ palmas_usb->irq3 = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_OTG_IRQ);
+ palmas_usb->irq4 = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_IRQ);
+
+ palmas_usb->comparator.set_vbus = palmas_set_vbus;
+ palmas_usb->comparator.start_srp = palmas_start_srp;
+
+ ret = omap_usb2_set_comparator(&palmas_usb->comparator);
+ if (ret == -ENODEV) {
+ dev_dbg(&pdev->dev, "phy not ready, deferring probe");
+ return -EPROBE_DEFER;
+ }
+
+ palmas_usb_wakeup(palmas, pdata->wakeup);
+
+ /* init spinlock for workqueue */
+ spin_lock_init(&palmas_usb->lock);
+
+ if (!pdata->no_control_vbus) {
+ palmas_usb->vbus_reg = devm_regulator_get(&pdev->dev, "vbus");
+ if (IS_ERR(palmas_usb->vbus_reg)) {
+ dev_err(&pdev->dev, "vbus init failed\n");
+ return PTR_ERR(palmas_usb->vbus_reg);
+ }
+ }
+
+ platform_set_drvdata(pdev, palmas_usb);
+
+ if (device_create_file(&pdev->dev, &dev_attr_vbus))
+ dev_warn(&pdev->dev, "could not create sysfs file\n");
+
+ /* init spinlock for workqueue */
+ spin_lock_init(&palmas_usb->lock);
+
+ INIT_WORK(&palmas_usb->set_vbus_work, palmas_set_vbus_work);
+
+ status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->irq2,
+ NULL, palmas_id_wakeup_irq,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "palmas_usb", palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
+ palmas_usb->irq2, status);
+ goto fail_irq;
+ }
+
+ status = devm_request_threaded_irq(palmas_usb->dev, palmas_usb->irq4,
+ NULL, palmas_vbus_wakeup_irq,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "palmas_usb", palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
+ palmas_usb->irq4, status);
+ goto fail_irq;
+ }
+
+ dev_info(&pdev->dev, "Initialized Palmas USB module\n");
+
+ status = palmas_enable_irq(palmas_usb);
+ if (status < 0) {
+ dev_dbg(&pdev->dev, "enable irq failed\n");
+ goto fail_irq;
+ }
+
+ return 0;
+
+fail_irq:
+ cancel_work_sync(&palmas_usb->set_vbus_work);
+ device_remove_file(palmas_usb->dev, &dev_attr_vbus);
+
+ return status;
+}
+
+static int palmas_usb_remove(struct platform_device *pdev)
+{
+ struct palmas_usb *palmas_usb = platform_get_drvdata(pdev);
+
+ device_remove_file(palmas_usb->dev, &dev_attr_vbus);
+ cancel_work_sync(&palmas_usb->set_vbus_work);
+
+ return 0;
+}
+
+static struct of_device_id of_palmas_match_tbl[] = {
+ { .compatible = "ti,palmas-usb", },
+ { /* end */ }
+};
+
+static struct platform_driver palmas_usb_driver = {
+ .probe = palmas_usb_probe,
+ .remove = palmas_usb_remove,
+ .driver = {
+ .name = "palmas-usb",
+ .of_match_table = of_palmas_match_tbl,
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(palmas_usb_driver);
+
+MODULE_ALIAS("platform:palmas-usb");
+MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
+MODULE_DESCRIPTION("Palmas USB transceiver driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index a4d13d7..f1c936c 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -19,6 +19,9 @@
#include <linux/leds.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
+#include <linux/usb/phy_companion.h>
+#include <linux/usb/dwc3-omap.h>
+#include <linux/platform_data/dwc3-omap.h>

#define PALMAS_NUM_CLIENTS 3

@@ -341,6 +344,8 @@ struct palmas_usb {
struct palmas *palmas;
struct device *dev;

+ struct phy_companion comparator;
+
/* for vbus reporting with irqs disabled */
spinlock_t lock;

@@ -356,7 +361,7 @@ struct palmas_usb {

int vbus_enable;

- u8 linkstat;
+ enum omap_dwc3_vbus_id_status linkstat;
};

#define comparator_to_palmas(x) container_of((x), struct palmas_usb, comparator)
--
1.7.10.4


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