drivers/power/twl6030.c

   1 /*
   2  * (C) Copyright 2010
   3  * Texas Instruments, <www.ti.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #include <config.h>
   8 #ifdef CONFIG_TWL6030_POWER
   9
  10 #include <twl6030.h>
  11
  12 static struct twl6030_data *twl;
  13
  14 static struct twl6030_data twl6030_info = {
  15         .chip_type      = chip_TWL6030,
  16         .adc_rbase      = GPCH0_LSB,
  17         .adc_ctrl       = CTRL_P2,
  18         .adc_enable     = CTRL_P2_SP2,
  19         .vbat_mult      = TWL6030_VBAT_MULT,
  20         .vbat_shift     = TWL6030_VBAT_SHIFT,
  21 };
  22
  23 static struct twl6030_data twl6032_info = {
  24         .chip_type      = chip_TWL6032,
  25         .adc_rbase      = TWL6032_GPCH0_LSB,
  26         .adc_ctrl       = TWL6032_CTRL_P1,
  27         .adc_enable     = CTRL_P1_SP1,
  28         .vbat_mult      = TWL6032_VBAT_MULT,
  29         .vbat_shift     = TWL6032_VBAT_SHIFT,
  30 };
  31
  32 static int twl6030_gpadc_read_channel(u8 channel_no)
  33 {
  34         u8 lsb = 0;
  35         u8 msb = 0;
  36         int ret = 0;
  37
  38         ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  39                                   twl->adc_rbase + channel_no * 2, &lsb);
  40         if (ret)
  41                 return ret;
  42
  43         ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  44                                   twl->adc_rbase + 1 + channel_no * 2, &msb);
  45         if (ret)
  46                 return ret;
  47
  48         return (msb << 8) | lsb;
  49 }
  50
  51 static int twl6030_gpadc_sw2_trigger(void)
  52 {
  53         u8 val;
  54         int ret = 0;
  55
  56         ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC,
  57                                    twl->adc_ctrl, twl->adc_enable);
  58         if (ret)
  59                 return ret;
  60
  61         /* Waiting until the SW1 conversion ends*/
  62         val =  CTRL_P2_BUSY;
  63
  64         while (!((val & CTRL_P2_EOCP2) && (!(val & CTRL_P2_BUSY)))) {
  65                 ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC,
  66                                           twl->adc_ctrl, &val);
  67                 if (ret)
  68                         return ret;
  69                 udelay(1000);
  70         }
  71
  72         return 0;
  73 }
  74
  75 void twl6030_stop_usb_charging(void)
  76 {
  77         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CONTROLLER_CTRL1, 0);
  78
  79         return;
  80 }
  81
  82 void twl6030_start_usb_charging(void)
  83 {
  84         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  85                              CHARGERUSB_VICHRG, CHARGERUSB_VICHRG_1500);
  86         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  87                              CHARGERUSB_CINLIMIT, CHARGERUSB_CIN_LIMIT_NONE);
  88         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  89                              CONTROLLER_INT_MASK, MBAT_TEMP);
  90         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  91                              CHARGERUSB_INT_MASK, MASK_MCHARGERUSB_THMREG);
  92         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  93                              CHARGERUSB_VOREG, CHARGERUSB_VOREG_4P0);
  94         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  95                              CHARGERUSB_CTRL2, CHARGERUSB_CTRL2_VITERM_400);
  96         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL1, TERM);
  97         /* Enable USB charging */
  98         twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER,
  99                              CONTROLLER_CTRL1, CONTROLLER_CTRL1_EN_CHARGER);
 100         return;
 101 }
 102
 103 int twl6030_get_battery_current(void)
 104 {
 105         int battery_current = 0;
 106         u8 msb = 0;
 107         u8 lsb = 0;
 108
 109         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, FG_REG_11, &msb);
 110         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, FG_REG_10, &lsb);
 111         battery_current = ((msb << 8) | lsb);
 112
 113         /* convert 10 bit signed number to 16 bit signed number */
 114         if (battery_current >= 0x2000)
 115                 battery_current = (battery_current - 0x4000);
 116
 117         battery_current = battery_current * 3000 / 4096;
 118         printf("Battery Current: %d mA\n", battery_current);
 119
 120         return battery_current;
 121 }
 122
 123 int twl6030_get_battery_voltage(void)
 124 {
 125         int battery_volt = 0;
 126         int ret = 0;
 127         u8 vbatch;
 128
 129         if (twl->chip_type == chip_TWL6030) {
 130                 vbatch = TWL6030_GPADC_VBAT_CHNL;
 131         } else {
 132                 ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC,
 133                                            TWL6032_GPSELECT_ISB,
 134                                            TWL6032_GPADC_VBAT_CHNL);
 135                 if (ret)
 136                         return ret;
 137                 vbatch = 0;
 138         }
 139
 140         /* Start GPADC SW conversion */
 141         ret = twl6030_gpadc_sw2_trigger();
 142         if (ret) {
 143                 printf("Failed to convert battery voltage\n");
 144                 return ret;
 145         }
 146
 147         /* measure Vbat voltage */
 148         battery_volt = twl6030_gpadc_read_channel(vbatch);
 149         if (battery_volt < 0) {
 150                 printf("Failed to read battery voltage\n");
 151                 return ret;
 152         }
 153         battery_volt = (battery_volt * twl->vbat_mult) >> twl->vbat_shift;
 154         printf("Battery Voltage: %d mV\n", battery_volt);
 155
 156         return battery_volt;
 157 }
 158
 159 void twl6030_init_battery_charging(void)
 160 {
 161         u8 val = 0;
 162         int battery_volt = 0;
 163         int ret = 0;
 164
 165         ret = twl6030_i2c_read_u8(TWL6030_CHIP_USB, USB_PRODUCT_ID_LSB, &val);
 166         if (ret) {
 167                 puts("twl6030_init_battery_charging(): could not determine chip!\n");
 168                 return;
 169         }
 170         if (val == 0x30) {
 171                 twl = &twl6030_info;
 172         } else if (val == 0x32) {
 173                 twl = &twl6032_info;
 174         } else {
 175                 puts("twl6030_init_battery_charging(): unsupported chip type\n");
 176                 return;
 177         }
 178
 179         /* Enable VBAT measurement */
 180         if (twl->chip_type == chip_TWL6030) {
 181                 twl6030_i2c_write_u8(TWL6030_CHIP_PM, MISC1, VBAT_MEAS);
 182                 twl6030_i2c_write_u8(TWL6030_CHIP_ADC,
 183                                      TWL6030_GPADC_CTRL,
 184                                      GPADC_CTRL_SCALER_DIV4);
 185         } else {
 186                 twl6030_i2c_write_u8(TWL6030_CHIP_ADC,
 187                                      TWL6032_GPADC_CTRL2,
 188                                      GPADC_CTRL2_CH18_SCALER_EN);
 189         }
 190
 191         /* Enable GPADC module */
 192         ret = twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, TOGGLE1, FGS | GPADCS);
 193         if (ret) {
 194                 printf("Failed to enable GPADC\n");
 195                 return;
 196         }
 197
 198         battery_volt = twl6030_get_battery_voltage();
 199         if (battery_volt < 0)
 200                 return;
 201
 202         if (battery_volt < 3000)
 203                 printf("Main battery voltage too low!\n");
 204
 205         /* Check for the presence of USB charger */
 206         twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, CONTROLLER_STAT1, &val);
 207
 208         /* check for battery presence indirectly via Fuel gauge */
 209         if ((val & VBUS_DET) && (battery_volt < 3300))
 210                 twl6030_start_usb_charging();
 211
 212         return;
 213 }
 214
 215 void twl6030_power_mmc_init()
 216 {
 217         /* set voltage to 3.0 and turnon for APP */
 218         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VMMC_CFG_VOLTATE, 0x15);
 219         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VMMC_CFG_STATE, 0x21);
 220 }
 221
 222 void twl6030_usb_device_settings()
 223 {
 224         u8 data = 0;
 225
 226         /* Select APP Group and set state to ON */
 227         twl6030_i2c_write_u8(TWL6030_CHIP_PM, VUSB_CFG_STATE, 0x21);
 228
 229         twl6030_i2c_read_u8(TWL6030_CHIP_PM, MISC2, &data);
 230         data |= 0x10;
 231
 232         /* Select the input supply for VBUS regulator */
 233         twl6030_i2c_write_u8(TWL6030_CHIP_PM, MISC2, data);
 234 }
 235 #endif