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/*
* Copyright (C) 2009 ST Ericsson.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/usb/musb.h>
#include <mach/ab8500.h>
#include <mach/musb_db8500.h>
#ifdef CONFIG_REGULATOR
#include <linux/regulator/consumer.h>
struct regulator *musb_vape_supply, *musb_vbus_supply;
#endif
int boot_time_flag;
/**
* stm_musb_states - Different states of musb_chip
*
* Used for USB cable plug-in state machine
*/
enum stm_musb_states {
USB_IDLE,
USB_DEVICE,
USB_HOST,
};
enum stm_musb_states stm_musb_curr_state = USB_IDLE;
void musb_set_session(void);
/**
* usb_kick_watchdog() - Kick the watch dog timer
*
* This function used to Kick the watch dog timer
*/
void usb_kick_watchdog(void)
{
ab8500_write(AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WDOG_CTRL_REG, AB8500_MAIN_WATCHDOG_ENABLE);
ab8500_write(AB8500_SYS_CTRL2_BLOCK, AB8500_MAIN_WDOG_CTRL_REG,
(AB8500_MAIN_WATCHDOG_ENABLE | AB8500_MAIN_WATCHDOG_KICK));
mdelay(WATCHDOG_DELAY);
ab8500_write(AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WDOG_CTRL_REG, AB8500_MAIN_WATCHDOG_DISABLE);
mdelay(WATCHDOG_DELAY);
}
/**
* usb_host_phy_en() - for enabling the 5V to usb host
* @enable: to enabling the Phy for host.
*
* This function used to set the voltage for USB host mode
*/
void usb_host_phy_en(int enable)
{
if (enable == USB_ENABLE) {
if (boot_time_flag) {
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_ENABLE);
ab8500_write(AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_USB_HOST_ENABLE);
} else {
#ifdef CONFIG_REGULATOR
regulator_enable(musb_vbus_supply);
regulator_set_optimum_mode(musb_vape_supply, 1);
#else
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_ENABLE);
#endif
ab8500_write(AB8500_USB,
AB8500_USB_PHY_CTRL_REG, AB8500_USB_HOST_ENABLE);
}
} else {
if (boot_time_flag) {
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_DISABLE);
ab8500_write(AB8500_USB,
AB8500_USB_PHY_CTRL_REG, AB8500_USB_HOST_DISABLE);
boot_time_flag = USB_DISABLE;
} else {
#ifdef CONFIG_REGULATOR
regulator_disable(musb_vbus_supply);
regulator_set_optimum_mode(musb_vape_supply, 0);
#else
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_DISABLE);
#endif
ab8500_write(AB8500_USB,
AB8500_USB_PHY_CTRL_REG, AB8500_USB_HOST_DISABLE);
}
}
}
/**
* usb_host_insert_handler() - Detect the USB host cable insertion
*
* This function used to detect the USB host cable insertion.
*/
void usb_host_insert_handler(void)
{
if (stm_musb_curr_state == USB_IDLE) {
stm_musb_curr_state = USB_HOST;
usb_host_phy_en(USB_ENABLE);
musb_set_session();
}
}
/**
* usb_host_remove_handler() - Removed the USB host cable
*
* This function used to detect the USB host cable removed.
*/
void usb_host_remove_handler(void)
{
if (stm_musb_curr_state == USB_HOST) {
stm_musb_curr_state = USB_IDLE;
usb_host_phy_en(USB_DISABLE);
}
}
/**
* usb_device_phy_en() - for enabling the 5V to usb gadget
* @enable: to enabling the Phy for device.
*
* This function used to set the voltage for USB gadget mode.
*/
void usb_device_phy_en(int enable)
{
if (enable == USB_ENABLE) {
usb_kick_watchdog();
if (boot_time_flag) {
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_ENABLE);
ab8500_write(AB8500_USB, AB8500_USB_PHY_CTRL_REG, AB8500_USB_DEVICE_ENABLE);
} else {
#ifdef CONFIG_REGULATOR
regulator_enable(musb_vbus_supply);
regulator_set_optimum_mode(musb_vape_supply, 1);
#else
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_ENABLE);
#endif
ab8500_write(AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_USB_DEVICE_ENABLE);
}
} else {
if (boot_time_flag) {
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_DISABLE);
ab8500_write(AB8500_USB,
AB8500_USB_PHY_CTRL_REG, AB8500_USB_DEVICE_DISABLE);
boot_time_flag = USB_DISABLE;
} else {
#ifdef CONFIG_REGULATOR
regulator_disable(musb_vbus_supply);
regulator_set_optimum_mode(musb_vape_supply, 0);
#else
ab8500_write(AB8500_REGU_CTRL1,
AB8500_REGU_VUSB_CTRL_REG, AB8500_VBUS_DISABLE);
#endif
ab8500_write(AB8500_USB, AB8500_USB_PHY_CTRL_REG,
AB8500_USB_DEVICE_DISABLE);
}
}
}
/**
* usb_device_insert_handler() - for enabling the 5V to usb device
*
* This function used to set the voltage for USB device mode
*/
void usb_device_insert_handler(void)
{
if (stm_musb_curr_state == USB_IDLE) {
stm_musb_curr_state = USB_DEVICE;
usb_device_phy_en(USB_ENABLE);
}
}
/**
* usb_device_remove_handler() - remove the 5V to usb device
*
* This function used to remove the voltage for USB device mode.
*/
void usb_device_remove_handler(void)
{
if (stm_musb_curr_state == USB_DEVICE) {
stm_musb_curr_state = USB_IDLE;
usb_device_phy_en(USB_DISABLE);
}
}
/**
* musb_phy_en : register USB callback handlers for ab8500
* @mode: value for mode.
*
* This function is used to register USB callback handlers for ab8500.
*/
int musb_phy_en(u8 mode)
{
u8 ab8500_rev;
int ret;
#ifdef CONFIG_REGULATOR
musb_vape_supply = regulator_get(NULL, "v-ape");
if (IS_ERR(musb_vape_supply)) {
ret = PTR_ERR(musb_vape_supply);
printk(KERN_WARNING "failed to get v-ape supply\n");
return -1;
}
regulator_enable(musb_vape_supply);
/*
* When usb cable is not connected, set_optimum to 0 to release any
* OPP constraints on the APE domain with respect to the USB client.
* This is done to run APE at low power OPP when usb is not used.
*/
regulator_set_optimum_mode(musb_vape_supply, 0);
musb_vbus_supply = regulator_get(NULL, "v-bus");
if (IS_ERR(musb_vbus_supply)) {
ret = PTR_ERR(musb_vbus_supply);
printk(KERN_WARNING "failed to get v-bus supply\n");
return -1;
}
#endif
ab8500_rev = ab8500_read(AB8500_MISC, AB8500_REV_REG);
if ((ab8500_rev == AB8500_REV_10) || (ab8500_rev == AB8500_REV_11)) {
if (mode == MUSB_HOST || mode == MUSB_OTG) {
ab8500_write
(AB8500_INTERRUPT,
AB8500_IT_MASK20_REG, AB8500_IT_MASK20_MASK);
ret = ab8500_set_callback_handler
(AB8500_ID_WAKEUP_RISING,
usb_host_insert_handler, NULL);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb host"
" insertion\n");
return ret;
}
ab8500_write
(AB8500_INTERRUPT, AB8500_IT_MASK21_REG,
AB8500_IT_MASK21_MASK);
ret = ab8500_set_callback_handler
(AB8500_ID_WAKEUP_FALLING,
usb_host_remove_handler, NULL);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb host"
" removal\n");
return ret;
}
usb_kick_watchdog();
}
if (mode == MUSB_PERIPHERAL || mode == MUSB_OTG) {
ab8500_write
(AB8500_INTERRUPT, AB8500_IT_MASK2_REG,
AB8500_IT_MASK2_MASK);
ret = ab8500_set_callback_handler
(AB8500_VBUS_RISING, usb_device_insert_handler, NULL);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb device"
" insertion\n");
return ret;
}
ret = ab8500_set_callback_handler
(AB8500_VBUS_FALLING, usb_device_remove_handler, NULL);
if (ret < 0) {
printk(KERN_ERR "failed to set the callback"
" handler for usb host"
" removal\n");
return ret;
}
}
}
return 0;
}
/**
* musb_force_detect : detect the USB cable during boot time.
* @mode: value for mode.
*
* This function is used to detect the USB cable during boot time.
*/
int musb_force_detect(u8 mode)
{
u8 ab8500_rev;
int usb_status = 0;
ab8500_rev = ab8500_read(AB8500_MISC, AB8500_REV_REG);
if ((ab8500_rev == AB8500_REV_10) || (ab8500_rev == AB8500_REV_11)) {
if (mode == MUSB_HOST || mode == MUSB_OTG) {
usb_status = ab8500_read
(AB8500_INTERRUPT, AB8500_IT_SOURCE20_REG);
if (usb_status & AB8500_SRC_INT_USB_HOST) {
boot_time_flag = USB_ENABLE;
usb_host_phy_en(USB_ENABLE);
}
}
if (mode == MUSB_PERIPHERAL || mode == MUSB_OTG) {
usb_status = ab8500_read
(AB8500_INTERRUPT, AB8500_IT_SOURCE2_REG);
if (usb_status & AB8500_SRC_INT_USB_DEVICE) {
boot_time_flag = USB_ENABLE;
usb_device_phy_en(USB_ENABLE);
}
}
}
return 0;
}
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