472 lines
12 KiB
C
472 lines
12 KiB
C
/*
|
|
* twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
|
|
*
|
|
* Copyright (C) 2010 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: 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.
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/usb/musb.h>
|
|
#include <linux/usb/phy_companion.h>
|
|
#include <linux/phy/omap_usb.h>
|
|
#include <linux/i2c/twl.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of.h>
|
|
|
|
/* usb register definitions */
|
|
#define USB_VENDOR_ID_LSB 0x00
|
|
#define USB_VENDOR_ID_MSB 0x01
|
|
#define USB_PRODUCT_ID_LSB 0x02
|
|
#define USB_PRODUCT_ID_MSB 0x03
|
|
#define USB_VBUS_CTRL_SET 0x04
|
|
#define USB_VBUS_CTRL_CLR 0x05
|
|
#define USB_ID_CTRL_SET 0x06
|
|
#define USB_ID_CTRL_CLR 0x07
|
|
#define USB_VBUS_INT_SRC 0x08
|
|
#define USB_VBUS_INT_LATCH_SET 0x09
|
|
#define USB_VBUS_INT_LATCH_CLR 0x0A
|
|
#define USB_VBUS_INT_EN_LO_SET 0x0B
|
|
#define USB_VBUS_INT_EN_LO_CLR 0x0C
|
|
#define USB_VBUS_INT_EN_HI_SET 0x0D
|
|
#define USB_VBUS_INT_EN_HI_CLR 0x0E
|
|
#define USB_ID_INT_SRC 0x0F
|
|
#define USB_ID_INT_LATCH_SET 0x10
|
|
#define USB_ID_INT_LATCH_CLR 0x11
|
|
|
|
#define USB_ID_INT_EN_LO_SET 0x12
|
|
#define USB_ID_INT_EN_LO_CLR 0x13
|
|
#define USB_ID_INT_EN_HI_SET 0x14
|
|
#define USB_ID_INT_EN_HI_CLR 0x15
|
|
#define USB_OTG_ADP_CTRL 0x16
|
|
#define USB_OTG_ADP_HIGH 0x17
|
|
#define USB_OTG_ADP_LOW 0x18
|
|
#define USB_OTG_ADP_RISE 0x19
|
|
#define USB_OTG_REVISION 0x1A
|
|
|
|
/* to be moved to LDO */
|
|
#define TWL6030_MISC2 0xE5
|
|
#define TWL6030_CFG_LDO_PD2 0xF5
|
|
#define TWL6030_BACKUP_REG 0xFA
|
|
|
|
#define STS_HW_CONDITIONS 0x21
|
|
|
|
/* In module TWL6030_MODULE_PM_MASTER */
|
|
#define STS_HW_CONDITIONS 0x21
|
|
#define STS_USB_ID BIT(2)
|
|
|
|
/* In module TWL6030_MODULE_PM_RECEIVER */
|
|
#define VUSB_CFG_TRANS 0x71
|
|
#define VUSB_CFG_STATE 0x72
|
|
#define VUSB_CFG_VOLTAGE 0x73
|
|
|
|
/* in module TWL6030_MODULE_MAIN_CHARGE */
|
|
|
|
#define CHARGERUSB_CTRL1 0x8
|
|
|
|
#define CONTROLLER_STAT1 0x03
|
|
#define VBUS_DET BIT(2)
|
|
|
|
struct twl6030_usb {
|
|
struct phy_companion comparator;
|
|
struct device *dev;
|
|
|
|
/* for vbus reporting with irqs disabled */
|
|
spinlock_t lock;
|
|
|
|
struct regulator *usb3v3;
|
|
|
|
/* used to check initial cable status after probe */
|
|
struct delayed_work get_status_work;
|
|
|
|
/* used to set vbus, in atomic path */
|
|
struct work_struct set_vbus_work;
|
|
|
|
int irq1;
|
|
int irq2;
|
|
enum musb_vbus_id_status linkstat;
|
|
u8 asleep;
|
|
bool vbus_enable;
|
|
const char *regulator;
|
|
};
|
|
|
|
#define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
|
|
u8 data, u8 address)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = twl_i2c_write_u8(module, data, address);
|
|
if (ret < 0)
|
|
dev_err(twl->dev,
|
|
"Write[0x%x] Error %d\n", address, ret);
|
|
return ret;
|
|
}
|
|
|
|
static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
|
|
{
|
|
u8 data;
|
|
int ret;
|
|
|
|
ret = twl_i2c_read_u8(module, &data, address);
|
|
if (ret >= 0)
|
|
ret = data;
|
|
else
|
|
dev_err(twl->dev,
|
|
"readb[0x%x,0x%x] Error %d\n",
|
|
module, address, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int twl6030_start_srp(struct phy_companion *comparator)
|
|
{
|
|
struct twl6030_usb *twl = comparator_to_twl(comparator);
|
|
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
|
|
|
|
mdelay(100);
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
|
|
{
|
|
/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
|
|
twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_BACKUP_REG);
|
|
|
|
/* Program CFG_LDO_PD2 register and set VUSB bit */
|
|
twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x1, TWL6030_CFG_LDO_PD2);
|
|
|
|
/* Program MISC2 register and set bit VUSB_IN_VBAT */
|
|
twl6030_writeb(twl, TWL6030_MODULE_ID0, 0x10, TWL6030_MISC2);
|
|
|
|
twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
|
|
if (IS_ERR(twl->usb3v3))
|
|
return -ENODEV;
|
|
|
|
/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
|
|
|
|
/*
|
|
* Program the USB_ID_CTRL_SET register to enable GND drive
|
|
* and the ID comparators
|
|
*/
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t twl6030_usb_vbus_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct twl6030_usb *twl = dev_get_drvdata(dev);
|
|
unsigned long flags;
|
|
int ret = -EINVAL;
|
|
|
|
spin_lock_irqsave(&twl->lock, flags);
|
|
|
|
switch (twl->linkstat) {
|
|
case MUSB_VBUS_VALID:
|
|
ret = snprintf(buf, PAGE_SIZE, "vbus\n");
|
|
break;
|
|
case MUSB_ID_GROUND:
|
|
ret = snprintf(buf, PAGE_SIZE, "id\n");
|
|
break;
|
|
case MUSB_VBUS_OFF:
|
|
ret = snprintf(buf, PAGE_SIZE, "none\n");
|
|
break;
|
|
default:
|
|
ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
|
|
}
|
|
spin_unlock_irqrestore(&twl->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
|
|
|
|
static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
|
|
{
|
|
struct twl6030_usb *twl = _twl;
|
|
enum musb_vbus_id_status status = MUSB_UNKNOWN;
|
|
u8 vbus_state, hw_state;
|
|
int ret;
|
|
|
|
hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
|
|
|
|
vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
|
|
CONTROLLER_STAT1);
|
|
if (!(hw_state & STS_USB_ID)) {
|
|
if (vbus_state & VBUS_DET) {
|
|
ret = regulator_enable(twl->usb3v3);
|
|
if (ret)
|
|
dev_err(twl->dev, "Failed to enable usb3v3\n");
|
|
|
|
twl->asleep = 1;
|
|
status = MUSB_VBUS_VALID;
|
|
twl->linkstat = status;
|
|
ret = musb_mailbox(status);
|
|
if (ret)
|
|
twl->linkstat = MUSB_UNKNOWN;
|
|
} else {
|
|
if (twl->linkstat != MUSB_UNKNOWN) {
|
|
status = MUSB_VBUS_OFF;
|
|
twl->linkstat = status;
|
|
ret = musb_mailbox(status);
|
|
if (ret)
|
|
twl->linkstat = MUSB_UNKNOWN;
|
|
if (twl->asleep) {
|
|
regulator_disable(twl->usb3v3);
|
|
twl->asleep = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
sysfs_notify(&twl->dev->kobj, NULL, "vbus");
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
|
|
{
|
|
struct twl6030_usb *twl = _twl;
|
|
enum musb_vbus_id_status status = MUSB_UNKNOWN;
|
|
u8 hw_state;
|
|
int ret;
|
|
|
|
hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
|
|
|
|
if (hw_state & STS_USB_ID) {
|
|
ret = regulator_enable(twl->usb3v3);
|
|
if (ret)
|
|
dev_err(twl->dev, "Failed to enable usb3v3\n");
|
|
|
|
twl->asleep = 1;
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
|
|
status = MUSB_ID_GROUND;
|
|
twl->linkstat = status;
|
|
ret = musb_mailbox(status);
|
|
if (ret)
|
|
twl->linkstat = MUSB_UNKNOWN;
|
|
} else {
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
|
|
}
|
|
twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void twl6030_status_work(struct work_struct *work)
|
|
{
|
|
struct twl6030_usb *twl = container_of(work, struct twl6030_usb,
|
|
get_status_work.work);
|
|
|
|
twl6030_usb_irq(twl->irq2, twl);
|
|
twl6030_usbotg_irq(twl->irq1, twl);
|
|
}
|
|
|
|
static int twl6030_enable_irq(struct twl6030_usb *twl)
|
|
{
|
|
twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
|
|
twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
|
|
twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
|
|
|
|
twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
|
|
REG_INT_MSK_LINE_C);
|
|
twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
|
|
REG_INT_MSK_STS_C);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void otg_set_vbus_work(struct work_struct *data)
|
|
{
|
|
struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
|
|
set_vbus_work);
|
|
|
|
/*
|
|
* Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
|
|
* register. This enables boost mode.
|
|
*/
|
|
|
|
if (twl->vbus_enable)
|
|
twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x40,
|
|
CHARGERUSB_CTRL1);
|
|
else
|
|
twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE, 0x00,
|
|
CHARGERUSB_CTRL1);
|
|
}
|
|
|
|
static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
|
|
{
|
|
struct twl6030_usb *twl = comparator_to_twl(comparator);
|
|
|
|
twl->vbus_enable = enabled;
|
|
schedule_work(&twl->set_vbus_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int twl6030_usb_probe(struct platform_device *pdev)
|
|
{
|
|
u32 ret;
|
|
struct twl6030_usb *twl;
|
|
int status, err;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct device *dev = &pdev->dev;
|
|
struct twl4030_usb_data *pdata = dev_get_platdata(dev);
|
|
|
|
twl = devm_kzalloc(dev, sizeof(*twl), GFP_KERNEL);
|
|
if (!twl)
|
|
return -ENOMEM;
|
|
|
|
twl->dev = &pdev->dev;
|
|
twl->irq1 = platform_get_irq(pdev, 0);
|
|
twl->irq2 = platform_get_irq(pdev, 1);
|
|
twl->linkstat = MUSB_UNKNOWN;
|
|
|
|
twl->comparator.set_vbus = twl6030_set_vbus;
|
|
twl->comparator.start_srp = twl6030_start_srp;
|
|
|
|
ret = omap_usb2_set_comparator(&twl->comparator);
|
|
if (ret == -ENODEV) {
|
|
dev_info(&pdev->dev, "phy not ready, deferring probe");
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
if (np) {
|
|
twl->regulator = "usb";
|
|
} else if (pdata) {
|
|
if (pdata->features & TWL6032_SUBCLASS)
|
|
twl->regulator = "ldousb";
|
|
else
|
|
twl->regulator = "vusb";
|
|
} else {
|
|
dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* init spinlock for workqueue */
|
|
spin_lock_init(&twl->lock);
|
|
|
|
err = twl6030_usb_ldo_init(twl);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "ldo init failed\n");
|
|
return err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, twl);
|
|
if (device_create_file(&pdev->dev, &dev_attr_vbus))
|
|
dev_warn(&pdev->dev, "could not create sysfs file\n");
|
|
|
|
INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
|
|
INIT_DELAYED_WORK(&twl->get_status_work, twl6030_status_work);
|
|
|
|
status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
|
"twl6030_usb", twl);
|
|
if (status < 0) {
|
|
dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
|
|
twl->irq1, status);
|
|
device_remove_file(twl->dev, &dev_attr_vbus);
|
|
return status;
|
|
}
|
|
|
|
status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
|
|
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
|
"twl6030_usb", twl);
|
|
if (status < 0) {
|
|
dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
|
|
twl->irq2, status);
|
|
free_irq(twl->irq1, twl);
|
|
device_remove_file(twl->dev, &dev_attr_vbus);
|
|
return status;
|
|
}
|
|
|
|
twl->asleep = 0;
|
|
twl6030_enable_irq(twl);
|
|
schedule_delayed_work(&twl->get_status_work, HZ);
|
|
dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int twl6030_usb_remove(struct platform_device *pdev)
|
|
{
|
|
struct twl6030_usb *twl = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&twl->get_status_work);
|
|
twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
|
|
REG_INT_MSK_LINE_C);
|
|
twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
|
|
REG_INT_MSK_STS_C);
|
|
free_irq(twl->irq1, twl);
|
|
free_irq(twl->irq2, twl);
|
|
regulator_put(twl->usb3v3);
|
|
device_remove_file(twl->dev, &dev_attr_vbus);
|
|
cancel_work_sync(&twl->set_vbus_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id twl6030_usb_id_table[] = {
|
|
{ .compatible = "ti,twl6030-usb" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
|
|
#endif
|
|
|
|
static struct platform_driver twl6030_usb_driver = {
|
|
.probe = twl6030_usb_probe,
|
|
.remove = twl6030_usb_remove,
|
|
.driver = {
|
|
.name = "twl6030_usb",
|
|
.of_match_table = of_match_ptr(twl6030_usb_id_table),
|
|
},
|
|
};
|
|
|
|
static int __init twl6030_usb_init(void)
|
|
{
|
|
return platform_driver_register(&twl6030_usb_driver);
|
|
}
|
|
subsys_initcall(twl6030_usb_init);
|
|
|
|
static void __exit twl6030_usb_exit(void)
|
|
{
|
|
platform_driver_unregister(&twl6030_usb_driver);
|
|
}
|
|
module_exit(twl6030_usb_exit);
|
|
|
|
MODULE_ALIAS("platform:twl6030_usb");
|
|
MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
|
|
MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
|
|
MODULE_LICENSE("GPL");
|