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linux/drivers/usb/otg/twl6030-usb.c
Kishon Vijay Abraham I 0e98de67ba usb: otg: make twl6030_usb as a comparator driver to omap_usb2 
All the PHY configuration other than VBUS, ID GND and OTG SRP are removed
from twl6030. The phy configurations are taken care by the dedicated
usb2 phy driver. So twl6030 is made as comparator driver for VBUS and
ID detection.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-06 20:15:59 +03:00

434 lines
11 KiB
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/*
* 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-omap.h>
#include <linux/usb/phy_companion.h>
#include <linux/usb/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>
/* 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 set vbus, in atomic path */
struct work_struct set_vbus_work;
int irq1;
int irq2;
enum omap_musb_vbus_id_status linkstat;
u8 asleep;
bool irq_enabled;
bool vbus_enable;
unsigned long features;
};
#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, ret = 0;
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)
{
char *regulator_name;
if (twl->features & TWL6025_SUBCLASS)
regulator_name = "ldousb";
else
regulator_name = "vusb";
/* 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, regulator_name);
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 OMAP_MUSB_VBUS_VALID:
ret = snprintf(buf, PAGE_SIZE, "vbus\n");
break;
case OMAP_MUSB_ID_GROUND:
ret = snprintf(buf, PAGE_SIZE, "id\n");
break;
case OMAP_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 omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
u8 vbus_state, hw_state;
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) {
regulator_enable(twl->usb3v3);
twl->asleep = 1;
status = OMAP_MUSB_VBUS_VALID;
twl->linkstat = status;
omap_musb_mailbox(status);
} else {
if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
status = OMAP_MUSB_VBUS_OFF;
twl->linkstat = status;
omap_musb_mailbox(status);
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 omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
u8 hw_state;
hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
if (hw_state & STS_USB_ID) {
regulator_enable(twl->usb3v3);
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 = OMAP_MUSB_ID_GROUND;
twl->linkstat = status;
omap_musb_mailbox(status);
} 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 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);
twl6030_usb_irq(twl->irq2, twl);
twl6030_usbotg_irq(twl->irq1, twl);
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 __devinit twl6030_usb_probe(struct platform_device *pdev)
{
u32 ret;
struct twl6030_usb *twl;
int status, err;
struct twl4030_usb_data *pdata;
struct device *dev = &pdev->dev;
pdata = dev->platform_data;
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->features = pdata->features;
twl->linkstat = OMAP_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;
}
/* 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);
twl->irq_enabled = true;
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);
dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
return 0;
}
static int __exit twl6030_usb_remove(struct platform_device *pdev)
{
struct twl6030_usb *twl = platform_get_drvdata(pdev);
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;
}
static struct platform_driver twl6030_usb_driver = {
.probe = twl6030_usb_probe,
.remove = __exit_p(twl6030_usb_remove),
.driver = {
.name = "twl6030_usb",
.owner = THIS_MODULE,
},
};
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");
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