因为要看usb charging的问题，所以需要补充一下battery的相关知识，算是入门吧
BAT SCH
(1)VBATT_VSNS_P
(2)BAT_THERM
(3)I2C_SDA
(4)I2C_SCL
(5)VBATT_VSNS_M
sbl1_hw_pre_ddr_init: (1)pm_device_init (2)pm_driver_init (3) pm_sbl_chg_init
(1)
pm_device_init没有研究过，也是一些初始化
(2)
pm_sbl_boot_oem.c -> pm_driver_post_init (通过write register的方法来配置jeita)
err_flag |= pm_comm_write_byte(0x2 , 0x1094, 0x0F, 0x0); //warm 45
err_flag |= pm_comm_write_byte(0x2 , 0x1095, 0xDC, 0x0); //warm 45
依据各项目ic pmic的datasheet找到对应寄存器进行修改
(3)
pm_config_target.c -> strcut sbl_schg_specific_data (charger parameters chg_param_ptr)
包括usb输出电流(USBIN Input Current Limit)，开机电压(bootup_battery_theshold_mv)，jeita限制(Enable/Disable JEITA Hard Temp Limit Check in SBL)等等
pm_sbl_schg_specific_data_type
sbl_schg_specific_data[1] =
{
{
//Configuration Value, Enable config
{PM_SCHG_BATIF_LOW_BATTERY_THRESH_3P2, PM_DISABLE_CONFIG }, //Vlowbatt Threshold
{PM_SCHG_BATIF_LOW_BATTERY_THRESH_2P8, PM_ENABLE_CONFIG }, //APSD rerun Vlowbatt Threshold
{70, PM_ENABLE_CONFIG }, //Fg skin hot threshold: valid range is -30 to 97 degree C
{80, PM_ENABLE_CONFIG }, //Fg skin too hot threshold: valid range is -30 to 97 degree C
{80, PM_ENABLE_CONFIG }, //Fg charge hot threshold: valid range is -30 to 97 degree C
{90, PM_ENABLE_CONFIG }, //Fg charge too hot threshold: valid range is -30 to 97 degree C
{TRUE, PM_DISABLE_CONFIG }, //Use BATID and/or THERM pin for battery missing detection
{{TRUE, PM_SCHG_MISC_SNARL_WDOG_TMOUT_62P5MS, PM_SCHG_MISC_BARK_WDOG_TMOUT_128S, PM_SCHG_MISC_BITE_WDOG_TMOUT_8S}, PM_ENABLE_CONFIG }, //Enable/Disable and Timeout WDog Config
{2000, PM_ENABLE_CONFIG }, //FAST Charging Current
{300, PM_ENABLE_CONFIG }, //PRE Charge Current
{4400, PM_ENABLE_CONFIG }, //Float Voltage
{2500, PM_ENABLE_CONFIG }, //USBIN Input Current Limit
{1000, PM_DISABLE_CONFIG }, //DCIN Input Current Limit
{6750, 8250, PM_ENABLE_CONFIG }, //Fake battery detection range: Battery will be detected as fake battery if BATT ID in this range. unit: Ohms
{2000, 14000}, //Debug Board detect: BATT_ID PD Resistor ADC Min/Max Read Value range; unit: Ohms
PM_BATT_ID_PU_30K, //battery ID pull up resistor value
3300, //bootup_battery_theshold_mv
3300, //wipowr bootup battery thesholdmv
2800, //apsd_reset_threshold_mv: APSD reset only applicable if initial Vbatt level is less than this threshold
2800, //apsd_reset_theshold_no_uvlo_mv: Used if last reset reason is NOT UVLO
3200, //apsd_reset_theshold_uvlo_mv: Used if last reset reason is UVLO
TRUE, //Enable/Disable JEITA Hard Temp Limit Check in SBL
TRUE, //dbc_usb_500_mode
TRUE, //Verbose SBL CHG UART logging
1, //Pmic index of charger
}
};
pm_sbl_boot.c -> pm_app_chgr.c -> pm_sbl_config_chg_parameters ↓↓↓
pm_sbl_boot.c -> pm_app_chgr.c -> pm_sbl_chg_check_weak_battery_status
应用上述的chg_param_ptr, 在weak battery的状态下不会开机(即SBL Charging in progress....) + 闪红灯(Toggle Red LED)
XBL Core
QcomChargerConfig_VbattTh.cfg
BootToHLOSThresholdInMv = 3300
JeitaHardColdLimit = 0
JeitaSoftColdLimit = 10
JeitaSoftHotLimit = 45
JeitaHardHotLimit = 60
QcomChargerPlatform.c -> ChargerPlatform_ReadCfgParams -> ChargerPlatform_Init
if (CurrentBatteryStatus.BatteryVoltage >= gThresholdVbatt)
*pActionType = EFI_QCOM_CHARGER_ACTION_GOOD_TO_BOOT;
Kernel
qcom,fastchg-current-ma = <2000>; //最大快充电流
/* COOL = 10 degc, WARM = 40 degC*/ //jeita配置
qcom,jeita-soft-thresholds = <0x2ed8 0x1045>; <SOFT_COLD_ADC_CODE, SOFT_HOT_ADC_CODE>
/* COLD = 0 degC, HOT = 45 degC*/
qcom,jeita-hard-thresholds = <0x3e3d 0x0D85>; <HARD_COLD_ADC_CODE, HARD_HOT_ADC_CODE>
qcom,jeita-fcc-ranges = < //各jeita范围内电流
0 100 800000
101 400 2000000
401 450 2000000>;
qcom,jeita-fv-ranges = < //各jeita范围内电压
0 100 4180000
101 400 4350000
401 450 4350000>;
Charging phases
(1) Trickle-charge < 2.1V 45mA
(2) Preconditioning(precharge) > 2.1V + PRE Charge Current
(3) Constant current(fast charge) < Float Voltage + Fast Charging Current
(4) Constatnt voltage(taper charge) = Float Voltage
Chargint phase的配置还是发生在SBL1/XBL阶段，在高通平台上除了(1)Trigckle_charge都是可配置的,配置可见上述sbl_schg_specific_data
pm_sbl_boot.c -> pm_app_chgr.c -> pm_sbl_config_chg_parameters
-> pm_schg_chgr_set_charge_current(PRE Charge Current(2))
-> pm_schg_chgr_set_charge_current(FAST Charging Current(3))
-> pm_schg_chgr_set_float_volt(Float Voltage(4))