高通msm8953 SBL階段修改充電電流

最近遇到一個需求.就是修改不同的專案中在SBL下充電的電流.專案平臺是高通msm8953+pmi8952.剛拿到需求就是看了下SBL的代碼.SBL的代碼還是比較容易梳理的.
首先是找下SBL充電相關pm_sbl_chg_init(),在這個函式中做了

err_flag |= pm_sbl_config_chg_parameters(device_index);
            //Configure FG parameters to SRAM
err_flag |= pm_sbl_config_fg_sram(device_index);  //Needs to be called before DBC check
err_flag |= pm_sbl_chg_check_weak_battery_status(device_index);

pm_sbl_config_chg_parameters這個是配置充電的引數,在本平臺是有這么一個table來配置相關引數的

smbchg_specific_data[1] = {
{
      //Configuration Value,                             Enable config
      {PM_SMBCHG_BAT_IF_LOW_BATTERY_THRESH_3P25,         PM_DISABLE_CONFIG },  //Vlowbatt Threshold
      {PM_SMBCHG_USBCHGPTH_INPUT_PRIORITY_USBIN,         PM_DISABLE_CONFIG },  //Charger Path Input Priority
      {PM_SMBCHG_BAT_IF_BAT_MISS_DETECT_SRC_BMD_PIN,     PM_DISABLE_CONFIG },  //Battery Missing Detection Source
      {PM_SMBCHG_MISC_WD_TMOUT_18S,                      PM_DISABLE_CONFIG },  //WDOG Timeout
      {FALSE,                                            PM_DISABLE_CONFIG },  //Enable WDOG
      {1000,                                             PM_DISABLE_CONFIG },  //FAST Charging Current
      {250,                                              PM_DISABLE_CONFIG },  //PRE Charge Current
      {3000,                                             PM_DISABLE_CONFIG },  //PRE to Fast Charge Current
      {4350,                                             PM_ENABLE_CONFIG },  //Float Voltage
      {2100,                                             PM_DISABLE_CONFIG },  //USBIN Input Current Limit
//      {1000,                                             PM_DISABLE_CONFIG },  //DCIN Input Current Limit
      {200,                                              PM_ENABLE_CONFIG },  //apsd_reset_theshold_mv
      BOOTUP_VOLTAGE,                                                     //bootup_battery_theshold_mv
      3800,                                                                    //wipowr bootup battery thesholdmv
      FALSE,                                                                   //Enable/Disable JEITA Hard Temp Limit Check in SBL
          FALSE,                                                                   // dbc_high_current_mode
   }
};

pm_sbl_chg_check_weak_battery_status這個是主要的函式.首先充電時候pre-charge,fast-charge.平臺定義的話在pre-charge將type手動設定了USB(限流)所以不論怎么樣都最大使用500ma的電流.

    boot_log_message("Manually set to USB500 mode");
    CHG_VERIFY(pm_smbchg_usb_chgpth_set_cmd_il(device_index, PM_SMBCHG_USBCHGPTH_CMD_IL__USB51_MODE, TRUE));
    CHG_VERIFY(pm_smbchg_usb_chgpth_set_cmd_il(device_index, PM_SMBCHG_USBCHGPTH_CMD_IL__USBIN_MODE_CHG, FALSE));

根據這些我們首先需要去掉這個限制,

       err_flag |= pm_smbchg_usb_chgpth_en_hvdcp(device_index, FALSE); //Disable HVDCP
       err_flag |= pm_smbchg_usb_chgpth_config_aicl(device_index, PM_SMBCHG_USB_CHGPTH_AICL_CFG__AICL_EN, FALSE); //Disable AICL
       err_flag |= pm_smbchg_usb_chgpth_set_cmd_il(device_index, PM_SMBCHG_USBCHGPTH_CMD_IL__USBIN_MODE_CHG, TRUE); //set HC mode
       err_flag |= pm_smbchg_usb_chgpth_set_cmd_il(device_index, PM_SMBCHG_USBCHGPTH_CMD_IL__ICL_OVERRIDE, TRUE); //Set ICL_OVERRIDE

然后在設定暫存器將pre-charge current設定到550ma.這樣的話預充電階段能做的只有這么多.然后在設定pre_to_fast的值.將pre_to_fastcharge的值降低.在提高fastcharge的電流.具體設定可以再上面的smbchg_specific_data[1]陣列中 enable 配置然后設定大小.也可以在pm_sbl_config_chg_parameters()函式中去設定.

最后就是根據不同專案GPIO口的狀態做匹配.首先我是想用tlmm模塊中的介面來獲取gpio的狀態,但是發現tlmm初始化在我們充電的后面.所以直接來讀取暫存器.

#define GPIO_CFG    (*(uint32 *)0x1083000)       //TLMM_GPIO_CFG1
#define GPIO_IN_OUT (*(uint32 *)0x1083004)       //TLMM_GPIO_IN_OUT

指標大法好!!!