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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* USB charging control for spring board */
#include "adc.h"
#include "board.h"
#include "console.h"
#include "gpio.h"
#include "lp5562.h"
#include "registers.h"
#include "stm32_adc.h"
#include "task.h"
#include "timer.h"
#include "tsu6721.h"
#include "util.h"
#define PWM_FREQUENCY 10000 /* Hz */
/* Console output macros */
#define CPUTS(outstr) cputs(CC_USBCHARGE, outstr)
#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ## args)
/* Devices that need VBUS power */
#define POWERED_DEVICE_TYPE (TSU6721_TYPE_OTG | \
TSU6721_TYPE_JIG_UART_ON)
/* PWM controlled current limit */
#define I_LIMIT_500MA 85
#define I_LIMIT_1000MA 75
#define I_LIMIT_1500MA 50
#define I_LIMIT_2000MA 35
#define I_LIMIT_2400MA 25
#define I_LIMIT_3000MA 0
static enum ilim_config current_ilim_config = ILIM_CONFIG_MANUAL_OFF;
static const int apple_charger_type[4] = {I_LIMIT_500MA,
I_LIMIT_1000MA,
I_LIMIT_2000MA,
I_LIMIT_2400MA};
static void board_ilim_use_gpio(void)
{
/* Disable counter */
STM32_TIM_CR1(3) &= ~0x1;
/* Disable TIM3 clock */
STM32_RCC_APB1ENR &= ~0x2;
/* Switch to GPIO */
gpio_set_flags(GPIO_ILIM, GPIO_OUTPUT);
}
static void board_ilim_use_pwm(void)
{
uint32_t val;
/* Config alt. function (TIM3/PWM) */
val = STM32_GPIO_CRL_OFF(GPIO_B) & ~0x000f0000;
val |= 0x00090000;
STM32_GPIO_CRL_OFF(GPIO_B) = val;
/* Enable TIM3 clock */
STM32_RCC_APB1ENR |= 0x2;
/* Disable counter during setup */
STM32_TIM_CR1(3) = 0x0000;
/*
* CPU_CLOCK / PSC determines how fast the counter operates.
* ARR determines the wave period, CCRn determines duty cycle.
* Thus, frequency = CPU_CLOCK / PSC / ARR.
*
* Assuming 16MHz clock and ARR=100, PSC needed to achieve PWM_FREQUENCY
* is: PSC = CPU_CLOCK / PWM_FREQUENCY / ARR
*/
STM32_TIM_PSC(3) = CPU_CLOCK / PWM_FREQUENCY / 100; /* pre-scaler */
STM32_TIM_ARR(3) = 100; /* auto-reload value */
STM32_TIM_CCR1(3) = 100; /* duty cycle */
/* CC1 configured as output, PWM mode 1, preload enable */
STM32_TIM_CCMR1(3) = (6 << 4) | (1 << 3);
/* CC1 output enable, active high */
STM32_TIM_CCER(3) = (1 << 0);
/* Generate update event to force loading of shadow registers */
STM32_TIM_EGR(3) |= 1;
/* Enable auto-reload preload, start counting */
STM32_TIM_CR1(3) |= (1 << 7) | (1 << 0);
}
void board_ilim_config(enum ilim_config config)
{
if (config == current_ilim_config)
return;
current_ilim_config = config;
switch (config) {
case ILIM_CONFIG_MANUAL_OFF:
case ILIM_CONFIG_MANUAL_ON:
board_ilim_use_gpio();
gpio_set_level(GPIO_ILIM,
config == ILIM_CONFIG_MANUAL_ON ? 1 : 0);
break;
case ILIM_CONFIG_PWM:
board_ilim_use_pwm();
break;
default:
break;
}
}
/* Returns Apple charger current limit */
static int board_apple_charger_current(void)
{
int vp, vn;
int type = 0;
int data[ADC_CH_COUNT];
/* TODO(victoryang): Handle potential race condition. */
tsu6721_disable_interrupts();
tsu6721_mux(TSU6721_MUX_USB);
/* Wait 20ms for signal to stablize */
msleep(20);
adc_read_all_channels(data);
vp = data[ADC_CH_USB_DP_SNS];
vn = data[ADC_CH_USB_DN_SNS];
tsu6721_mux(TSU6721_MUX_AUTO);
tsu6721_enable_interrupts();
if (vp > 1200)
type |= 0x2;
if (vn > 1200)
type |= 0x1;
return apple_charger_type[type];
}
void board_pwm_duty_cycle(int percent)
{
if (current_ilim_config != ILIM_CONFIG_PWM)
board_ilim_config(ILIM_CONFIG_PWM);
if (percent < 0)
percent = 0;
if (percent > 100)
percent = 100;
STM32_TIM_CCR1(3) = (percent * STM32_TIM_ARR(3)) / 100;
}
void usb_charge_interrupt(enum gpio_signal signal)
{
task_wake(TASK_ID_PMU_TPS65090_CHARGER);
}
static void usb_device_change(int dev_type)
{
static int last_dev_type;
if (last_dev_type == dev_type)
return;
last_dev_type = dev_type;
/* Supply VBUS if needed */
if (dev_type & POWERED_DEVICE_TYPE)
gpio_set_level(GPIO_BOOST_EN, 0);
else
gpio_set_level(GPIO_BOOST_EN, 1);
if (dev_type & TSU6721_TYPE_VBUS_DEBOUNCED) {
/* Limit USB port current. 500mA for not listed types. */
int current_limit = I_LIMIT_500MA;
if (dev_type & TSU6721_TYPE_CHG12)
current_limit = I_LIMIT_3000MA;
else if (dev_type & TSU6721_TYPE_APPLE_CHG) {
current_limit = board_apple_charger_current();
} else if ((dev_type & TSU6721_TYPE_CDP) ||
(dev_type & TSU6721_TYPE_DCP))
current_limit = I_LIMIT_1500MA;
board_pwm_duty_cycle(current_limit);
/* Turns on battery LED */
lp5562_poweron();
} else {
board_ilim_config(ILIM_CONFIG_MANUAL_ON);
lp5562_poweroff();
}
/* Log to console */
CPRINTF("[%T USB Attached: ");
if (dev_type == TSU6721_TYPE_NONE)
CPRINTF("Nothing]\n");
else if (dev_type & TSU6721_TYPE_OTG)
CPRINTF("OTG]\n");
else if (dev_type & TSU6721_TYPE_USB_HOST)
CPRINTF("USB Host]\n");
else if (dev_type & TSU6721_TYPE_CHG12)
CPRINTF("Type 1/2 Charger]\n");
else if (dev_type & TSU6721_TYPE_NON_STD_CHG)
CPRINTF("Non standard charger]\n");
else if (dev_type & TSU6721_TYPE_DCP)
CPRINTF("DCP]\n");
else if (dev_type & TSU6721_TYPE_CDP)
CPRINTF("CDP]\n");
else if (dev_type & TSU6721_TYPE_U200_CHG)
CPRINTF("U200]\n");
else if (dev_type & TSU6721_TYPE_APPLE_CHG)
CPRINTF("Apple charger]\n");
else if (dev_type & TSU6721_TYPE_JIG_UART_ON)
CPRINTF("JIG UART ON]\n");
else if (dev_type & TSU6721_TYPE_VBUS_DEBOUNCED)
CPRINTF("Unknown with power]\n");
else
CPRINTF("Unknown]\n");
}
void board_usb_charge_update(int force_update)
{
int int_val = tsu6721_get_interrupts();
if (int_val & TSU6721_INT_DETACH)
usb_device_change(TSU6721_TYPE_NONE);
else if (int_val || force_update)
usb_device_change(tsu6721_get_device_type());
}
/*
* Console command for debugging.
* TODO(victoryang): Remove after charging control is done.
*/
static int command_ilim(int argc, char **argv)
{
char *e;
int percent;
if (argc >= 2) {
if (strcasecmp(argv[1], "on") == 0)
board_ilim_config(ILIM_CONFIG_MANUAL_ON);
else if (strcasecmp(argv[1], "off") == 0)
board_ilim_config(ILIM_CONFIG_MANUAL_OFF);
else {
percent = strtoi(argv[1], &e, 0);
if (*e)
return EC_ERROR_PARAM1;
board_pwm_duty_cycle(percent);
}
}
if (current_ilim_config == ILIM_CONFIG_MANUAL_ON)
ccprintf("ILIM is GPIO high\n");
else if (current_ilim_config == ILIM_CONFIG_MANUAL_OFF)
ccprintf("ILIM is GPIO low\n");
else
ccprintf("ILIM is PWM duty cycle %d%%\n", STM32_TIM_CCR1(3));
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(ilim, command_ilim,
"[percent | on | off]",
"Set or show ILIM duty cycle/GPIO value",
NULL);
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