u-boot/board/freescale/common/pfuze.c
Peng Fan 7428f55c94 pmic:pfuze implement pmic_mode_init
This patch is to implement pmic_mode_init function, and add prototype
in header file.

This function is to set switching mode for pmic buck regulators to
improve system efficiency.

Mode:
OFF: The regulator is switched off and the output voltage is discharged.
PFM: In this mode, the regulator is always in PFM mode, which
     is useful at light loads for optimized efficiency.
PWM: In this mode, the regulator is always in PWM mode operation
     regardless of load conditions.
APS: In this mode, the regulator moves automatically between
     pulse skipping mode and PWM mode depending on load conditions.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
2015-02-11 12:27:46 +01:00

92 lines
2 KiB
C

/*
* Copyright 2014 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <power/pmic.h>
#include <power/pfuze100_pmic.h>
int pfuze_mode_init(struct pmic *p, u32 mode)
{
unsigned char offset, i, switch_num;
u32 id, ret;
pmic_reg_read(p, PFUZE100_DEVICEID, &id);
id = id & 0xf;
if (id == 0) {
switch_num = 6;
offset = PFUZE100_SW1CMODE;
} else if (id == 1) {
switch_num = 4;
offset = PFUZE100_SW2MODE;
} else {
printf("Not supported, id=%d\n", id);
return -EINVAL;
}
ret = pmic_reg_write(p, PFUZE100_SW1ABMODE, mode);
if (ret < 0) {
printf("Set SW1AB mode error!\n");
return ret;
}
for (i = 0; i < switch_num - 1; i++) {
ret = pmic_reg_write(p, offset + i * SWITCH_SIZE, mode);
if (ret < 0) {
printf("Set switch 0x%x mode error!\n",
offset + i * SWITCH_SIZE);
return ret;
}
}
return ret;
}
struct pmic *pfuze_common_init(unsigned char i2cbus)
{
struct pmic *p;
int ret;
unsigned int reg;
ret = power_pfuze100_init(i2cbus);
if (ret)
return NULL;
p = pmic_get("PFUZE100");
ret = pmic_probe(p);
if (ret)
return NULL;
pmic_reg_read(p, PFUZE100_DEVICEID, &reg);
printf("PMIC: PFUZE100 ID=0x%02x\n", reg);
/* Set SW1AB stanby volage to 0.975V */
pmic_reg_read(p, PFUZE100_SW1ABSTBY, &reg);
reg &= ~SW1x_STBY_MASK;
reg |= SW1x_0_975V;
pmic_reg_write(p, PFUZE100_SW1ABSTBY, reg);
/* Set SW1AB/VDDARM step ramp up time from 16us to 4us/25mV */
pmic_reg_read(p, PUZE_100_SW1ABCONF, &reg);
reg &= ~SW1xCONF_DVSSPEED_MASK;
reg |= SW1xCONF_DVSSPEED_4US;
pmic_reg_write(p, PUZE_100_SW1ABCONF, reg);
/* Set SW1C standby voltage to 0.975V */
pmic_reg_read(p, PFUZE100_SW1CSTBY, &reg);
reg &= ~SW1x_STBY_MASK;
reg |= SW1x_0_975V;
pmic_reg_write(p, PFUZE100_SW1CSTBY, reg);
/* Set SW1C/VDDSOC step ramp up time from 16us to 4us/25mV */
pmic_reg_read(p, PFUZE100_SW1CCONF, &reg);
reg &= ~SW1xCONF_DVSSPEED_MASK;
reg |= SW1xCONF_DVSSPEED_4US;
pmic_reg_write(p, PFUZE100_SW1CCONF, reg);
return p;
}