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tps62361.c
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tps62361.c
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/*
*
* @Component OMAPCONF
* @Filename tps62361.c
* @Description OMAP4 TPS 62361 (SMPS Voltage Regulator) Library
* @Author Konstantin Shlyakhovoy (x0155534@ti.com)
* Patrick Titiano (p-titiano@ti.com)
* @Date 2011
* @Copyright Texas Instruments Incorporated
*
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <tps62361.h>
#include <lib.h>
#include <mem.h>
#include <cpuinfo.h>
#include <prm44xx.h>
/* #define TPS62361_DEBUG */
#ifdef TPS62361_DEBUG
#include <stdio.h>
#define dprintf(format, ...) printf(format, ## __VA_ARGS__)
#else
#define dprintf(format, ...)
#endif
#define TPS62361_VDCDC1_MIN 500000
#define TPS62361_VDCDC1_STEP 10000
#define TPS62361_PFM_FLAG 0x80
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_is_present
* @BRIEF return 1 if TPS62361 is present on this platform,
* 0 otherwise
* @RETURNS 1 if TPS62361 chip is found
* 0 otherwise
* @DESCRIPTION return 1 if TPS62361 is present on this platform,
* 0 otherwise
*------------------------------------------------------------------------ */
unsigned short int tps62361_is_present(void)
{
/*
* SR-I2C link is write-only, cannot read-back any chip register ...
* Only way to know if this chip is present in the platform is to
* read the voltage controler registers and look for particular
* TPS62361 VDD_MPU slave address...
*/
unsigned int prm_vc_smps_sa;
int ret;
unsigned short present;
switch (cpu_get()) {
case OMAP_4430:
case OMAP_4460:
case OMAP_4470:
ret = mem_read(OMAP4430_PRM_VC_SMPS_SA, &prm_vc_smps_sa);
dprintf("%s(): OMAP4430_PRM_VC_SMPS_SA=0x%08X\n",
__func__, prm_vc_smps_sa);
if (ret != 0)
present = 0;
else
present = (prm_vc_smps_sa == 0x00601212);
break;
case OMAP_5430:
case OMAP_5432:
present = 0;
break;
default:
present = 0;
}
dprintf("%s(): present=%u\n", __func__, present);
return present;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_chip_revision_get
* @BRIEF return TPS62361 chip revision
* @RETURNS > 0.0 TPS62361 chip revision
* OMAPCONF_ERR_NOT_AVAILABLE in case of error
* @DESCRIPTION return TPS62361 chip revision
*------------------------------------------------------------------------ */
double tps62361_chip_revision_get(void)
{
/* SR-I2C link is write-only, cannot read-back any chip register ... */
return (double)OMAPCONF_ERR_NOT_AVAILABLE;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_eprom_revision_get
* @BRIEF return TPS62361 EPROM revision
* @RETURNS > 0.0 TPS62361 EPROM revision
* OMAPCONF_ERR_NOT_AVAILABLE in case of error
* @DESCRIPTION return TPS62361 EPROM revision
*------------------------------------------------------------------------ */
double tps62361_eprom_revision_get(void)
{
/* SR-I2C link is write-only, cannot read-back any chip register ... */
return (double)OMAPCONF_ERR_NOT_AVAILABLE;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_smps_offset_get
* @BRIEF return SMPS regulator voltage offset
* @RETURNS voltage offset in microvolts
* @DESCRIPTION return SMPS regulator voltage offset
*------------------------------------------------------------------------ */
long tps62361_smps_offset_get(void)
{
dprintf("%s(): offset=%lduV\n", __func__, (long)TPS62361_VDCDC1_MIN);
return (long)TPS62361_VDCDC1_MIN;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_smps_step_get
* @BRIEF return SMPS regulator voltage step in microvolts
* @RETURNS voltage step in microvolts
* @DESCRIPTION return SMPS regulator voltage step in microvolts
*------------------------------------------------------------------------ */
long tps62361_smps_step_get(void)
{
dprintf("%s(): step=%lduV\n", __func__, (long)TPS62361_VDCDC1_STEP);
return (long)TPS62361_VDCDC1_STEP;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_vsel_len_get
* @BRIEF return the size of the vsel command
* @RETURNS SMPS regulator size of the vsel command
* @DESCRIPTION return the size of the vsel command
*------------------------------------------------------------------------ */
int tps62361_vsel_len_get(void)
{
return 8;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_vsel_to_uv
* @BRIEF for a given rail, convert SMPS vsel command into voltage
* in microvolts.
* @RETURNS voltage in microvolts corresponding to SMPS vsel command
* @param[in] vsel: SMPS vsel command (in microvolts)
* @DESCRIPTION for a given rail, convert SMPS vsel command into voltage
* in microvolts.
*------------------------------------------------------------------------ */
unsigned long tps62361_vsel_to_uv(unsigned char vsel)
{
unsigned long uv;
vsel &= ~TPS62361_PFM_FLAG;
uv = TPS62361_VDCDC1_MIN + (TPS62361_VDCDC1_STEP * vsel);
dprintf("%s(%d)=%lduV\n", __func__, vsel, uv);
return uv;
}
/* ------------------------------------------------------------------------
* @FUNCTION tps62361_uv_to_vsel
* @BRIEF for a given rail, convert voltage in microvolts into
* SMPS vsel command.
* @RETURNS SMPS vsel command corresponding to uv
* @param[in] uv: voltage to be converted (in microvolts)
* @DESCRIPTION for a given rail, convert voltage in microvolts into
* SMPS vsel command.
*------------------------------------------------------------------------ */
unsigned char tps62361_uv_to_vsel(unsigned long uv)
{
unsigned char vsel;
vsel = (unsigned char)
DIV_ROUND_UP(uv - TPS62361_VDCDC1_MIN, TPS62361_VDCDC1_STEP);
dprintf("%s(%lduV)=0x%02X\n", __func__, uv, vsel);
return vsel;
}