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/*
* Copyright (c) 2009 NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "nvodm_pmu.h"
#include "nvodm_services.h"
#include "ad5258_dpm.h"
static NvBool
Ad5258I2cWrite8(
NvOdmPmuDeviceHandle hDevice,
NvU8 Addr,
NvU8 Data)
{
NvU32 i;
NvU8 WriteBuffer[2];
NvOdmI2cTransactionInfo TransactionInfo;
NvOdmI2cStatus status = NvOdmI2cStatus_Success;
Max8907bPrivData *hPmu = (Max8907bPrivData*)hDevice->pPrivate;
for (i = 0; i < AD5258_I2C_RETRY_CNT; i++)
{
WriteBuffer[0] = Addr & 0xFF; // AD5258 address
WriteBuffer[1] = Data & 0xFF; // written data
TransactionInfo.Address = AD5258_SLAVE_ADDR;
TransactionInfo.Buf = &WriteBuffer[0];
TransactionInfo.Flags = NVODM_I2C_IS_WRITE;
TransactionInfo.NumBytes = 2;
status = NvOdmI2cTransaction(hPmu->hOdmI2C, &TransactionInfo, 1,
AD5258_I2C_SPEED_KHZ, AD5258_I2C_TIMEOUT_MS);
if (status == NvOdmI2cStatus_Success)
return NV_TRUE;
}
// Transaction Error
switch (status)
{
case NvOdmI2cStatus_Timeout:
NVODMPMU_PRINTF(("NvOdmDpmI2cWrite8 Failed: Timeout\n"));
break;
case NvOdmI2cStatus_SlaveNotFound:
default:
NVODMPMU_PRINTF(("NvOdmDpmI2cWrite8 Failed: SlaveNotFound\n"));
break;
}
return NV_FALSE;
}
static NvBool
Ad5258I2cRead8(
NvOdmPmuDeviceHandle hDevice,
NvU8 Addr,
NvU8 *Data)
{
NvU32 i;
NvU8 ReadBuffer = 0;
NvOdmI2cStatus status = NvOdmI2cStatus_Success;
Max8907bPrivData *hPmu = (Max8907bPrivData*)hDevice->pPrivate;
NvOdmI2cTransactionInfo TransactionInfo[2];
for (i = 0; i < AD5258_I2C_RETRY_CNT; i++)
{
// The AD5258 register address
ReadBuffer = Addr & 0xFF;
TransactionInfo[0].Address = AD5258_SLAVE_ADDR;
TransactionInfo[0].Buf = &ReadBuffer;
TransactionInfo[0].Flags = NVODM_I2C_IS_WRITE;
TransactionInfo[0].NumBytes = 1;
TransactionInfo[1].Address = (AD5258_SLAVE_ADDR | 0x1);;
TransactionInfo[1].Buf = &ReadBuffer;
TransactionInfo[1].Flags = 0;
TransactionInfo[1].NumBytes = 1;
// Read data from PMU at the specified offset
status = NvOdmI2cTransaction(hPmu->hOdmI2C, &TransactionInfo[0], 2,
AD5258_I2C_SPEED_KHZ, AD5258_I2C_TIMEOUT_MS);
if (status == NvOdmI2cStatus_Success)
{
*Data = ReadBuffer;
return NV_TRUE;
}
}
// Transaction Error
switch (status)
{
case NvOdmI2cStatus_Timeout:
NVODMPMU_PRINTF(("NvOdmDpmI2cRead8 Failed: Timeout\n"));
break;
case NvOdmI2cStatus_SlaveNotFound:
default:
NVODMPMU_PRINTF(("NvOdmDpmI2cRead8 Failed: SlaveNotFound\n"));
break;
}
return NV_FALSE;
}
NvBool
Ad5258I2cSetVoltage(
NvOdmPmuDeviceHandle hDevice,
NvU32 MilliVolts)
{
static NvU32 s_LastMilliVolts = 0;
NvU8 Data = 0;
NvU8 Addr = AD5258_RDAC_ADDR;
if (s_LastMilliVolts == 0)
{
if (!Ad5258I2cGetVoltage(hDevice, &s_LastMilliVolts))
return NV_FALSE;
NV_ASSERT((s_LastMilliVolts >= AD5258_V0) &&
(s_LastMilliVolts <= AD5258_VMAX));
}
// Change voltage level one maximum allowed step at a time
while (s_LastMilliVolts != MilliVolts)
{
if (MilliVolts > s_LastMilliVolts + AD5258_MAX_STEP_MV)
s_LastMilliVolts += AD5258_MAX_STEP_MV;
else if (MilliVolts + AD5258_MAX_STEP_MV < s_LastMilliVolts)
s_LastMilliVolts -= AD5258_MAX_STEP_MV;
else
s_LastMilliVolts = MilliVolts;
// D(Vout) = (Vout - V0) * M1 / 2^b
Data = 0;
if (s_LastMilliVolts > AD5258_V0)
{
Data = (NvU8)(((s_LastMilliVolts - AD5258_V0) * AD5258_M1 +
(0x1 << (AD5258_b - 1))) >> AD5258_b);
Data++; // account for load
}
NV_ASSERT(Data <= AD5258_RDAC_MASK);
if (!Ad5258I2cWrite8(hDevice, Addr, Data))
return NV_FALSE;
NvOdmOsWaitUS(AD5258_MAX_STEP_SETTLE_TIME_US);
}
return NV_TRUE;
}
NvBool
Ad5258I2cGetVoltage(
NvOdmPmuDeviceHandle hDevice,
NvU32* pMilliVolts)
{
NvU8 Data = 0;
NvU8 Addr = AD5258_RDAC_ADDR;
if (!Ad5258I2cRead8(hDevice, Addr, &Data))
return NV_FALSE;
// Vout(D) = V0 + (D * M2) / 2^b
Data &= AD5258_RDAC_MASK;
*pMilliVolts = AD5258_V0 +
(((NvU32)Data * AD5258_M2 + (0x1 << (AD5258_b - 1))) >> AD5258_b);
return NV_TRUE;
}
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