/*
* ======== PMI_setVoltage ========
*/
PMI_Status PMI_setVoltage(unsigned voltage, unsigned wait)
{
PMI_Status status = PMI_OK;
unsigned voltageCode;
unsigned data;
/* lookup the voltage code corresponding to the new voltage */
switch (voltage) {
case 1300:
voltageCode = SP_1_3_VOLT; /* 1300 mV */
break;
case 1200:
voltageCode = SP_1_2_VOLT; /* 1200 mV */
break;
case 1100:
voltageCode = SP_1_1_VOLT; /* 1200 mV */
break;
case 1000:
voltageCode = SP_1_0_VOLT; /* 1200 mV */
break;
default:
status = PMI_FAIL;
}
/* command the PMIC to the new voltage */
if (status == PMI_OK) {
/* write the new voltage code */
PMI_writeI2C(PMIC_ADDR, DEFDCDC3_REG, voltageCode);
/* number of cycles to wait after initiating change to DCDC3 */
PMI_waitCpuCycles(_PMI_readBackDelay);
/* read back the voltage code to confirm new setting */
PMI_readI2C(PMIC_ADDR, DEFDCDC3_REG, &data);
if (data != voltageCode) {
status = PMI_FAIL;
}
}
/* optionally wait for voltage transition to complete */
if ((status == PMI_OK) && (wait != 0)) {
/* wait until power good is asserted by the PMIC */
do
{
PMI_readI2C(PMIC_ADDR, PGOOD_REG, &data);
}
while ((data & PGOOD_BIT) == 0);
}
return (status);
}
/*
* ======== PMI_initVoltageControl ========
*/
PMI_Status PMI_initVoltageControl(void)
{
unsigned state;
unsigned mask;
unsigned temp;
/* drive BUFF_OEn low to enable I2C clock on Beta EVM boards and later... */
/* a. setup PINMUX to select GPIO function */
temp = REG(PINMUX6);
REG(PINMUX6) = (temp & SELECT_6_7_4_MASK) | SELECT_GP2_FXN;
/* b. make sure GPIO module is enabled */
PMI_getModuleState(0, GPIO_PSC, GPIO_LPSC, &state);
if (state != GPIO_LPSC_ENABLE_STATE) {
PMI_setModuleState(0, GPIO_PSC, GPIO_LPSC, GPIO_LPSC_ENABLE_STATE);
}
/* c. setup GPIO direction and data register to drive GP2[6] low */
REG(GPIO_DIR23) &= ~GPIO_BIT6;
REG(GPIO_CLR_DATA23) |= GPIO_BIT6;
/* now initialize I2C bus control... */
PMI_initI2C();
/* setup PMIC's max SLEW rate for voltage transitions */
PMI_writeI2C(PMIC_ADDR, DEFSLEW_REG, DEFSLEW_VALUE);
/* setup PMIC's PGOODMASK to avoid resets during core voltage scaling */
PMI_readI2C(PMIC_ADDR, PGOODMASK_REG, &mask);
mask &= ~PGOODMASK_BITS;
PMI_writeI2C(PMIC_ADDR, PGOODMASK_REG, mask);
return (PMI_OK);
}
/*
* ======== PMI_getVoltage ========
*/
PMI_Status PMI_getVoltage(unsigned * voltage)
{
PMI_Status status = PMI_OK;
unsigned data;
PMI_readI2C(PMIC_ADDR, DEFDCDC3_REG, &data);
/* look up the voltage corresponding to the PMIC voltage code */
switch (data) {
case SP_1_3_VOLT:
*voltage = 1300; /* 1300 mV */
break;
case SP_1_2_VOLT:
*voltage = 1200; /* 1200 mV */
break;
case SP_1_1_VOLT:
*voltage = 1100; /* 1100 mV */
break;
case SP_1_0_VOLT:
*voltage = 1000; /* 1000 mV */
break;
default:
status = PMI_FAIL;
}
return (status);
}
/*
* ======== PMI_getVoltage ========
*/
PMI_Status PMI_getVoltage(unsigned * voltage)
{
PMI_Status status = PMI_OK;
unsigned data;
/* if this is very first transaction setup voltage control */
if (_PMI_sharedFirstTransaction == 1) {
_PMI_sharedFirstTransaction = 0;
PMI_readyVoltageControl(); /* get ready for voltage control */
}
else {
PMI_initI2C(); /* get ready for I2C transaction */
}
PMI_readI2C(PMIC_ADDR, DEFDCDC3_REG, &data);
/* look up the voltage corresponding to the PMIC voltage code */
switch (data) {
case SP_1_3_VOLT:
*voltage = 1300; /* 1300 mV */
break;
case SP_1_2_VOLT:
*voltage = 1200; /* 1200 mV */
break;
case SP_1_1_VOLT:
*voltage = 1100; /* 1100 mV */
break;
case SP_1_0_VOLT:
*voltage = 1000; /* 1000 mV */
break;
default:
status = PMI_FAIL;
}
return (status);
}
/*
* ======== PMI_setVoltage ========
*/
PMI_Status PMI_setVoltage(unsigned voltage, unsigned wait)
{
PMI_Status status = PMI_OK;
unsigned voltageCode;
unsigned data;
/* lookup the voltage code corresponding to the new voltage */
switch (voltage) {
case 1300:
voltageCode = SP_1_3_VOLT; /* 1300 mV */
break;
case 1200:
voltageCode = SP_1_2_VOLT; /* 1200 mV */
break;
case 1100:
voltageCode = SP_1_1_VOLT; /* 1200 mV */
break;
case 1000:
voltageCode = SP_1_0_VOLT; /* 1200 mV */
break;
default:
status = PMI_FAIL;
}
/* command the PMIC to the new voltage */
if (status == PMI_OK) {
/* if this is very first transaction setup voltage control */
if (_PMI_sharedFirstTransaction == 1) {
_PMI_sharedFirstTransaction = 0;
PMI_readyVoltageControl(); /* get ready for voltage control */
}
else {
PMI_initI2C(); /* get ready for I2C transaction */
}
/* write the new voltage code */
PMI_writeI2C(PMIC_ADDR, DEFDCDC3_REG, voltageCode);
/* read back the voltage code to confirm new setting */
PMI_readI2C(PMIC_ADDR, DEFDCDC3_REG, &data);
if (data != voltageCode) {
status = PMI_FAIL;
}
}
/* optionally wait for voltage transition to complete */
if ((status == PMI_OK) && (wait != 0)) {
/* wait until power good is asserted by the PMIC */
do
{
PMI_readI2C(PMIC_ADDR, PGOOD_REG, &data);
}
while ((data & PGOOD_BIT) == 0);
}
return (status);
}
