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// SPDX-License-Identifier: GPL-2.0+
/*
* AXP313(a) driver
*
* (C) Copyright 2023 Arm Ltd.
*
* Based on axp305.c
* (C) Copyright 2020 Jernej Skrabec <jernej.skrabec@siol.net>
* (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
* (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
*/
#include <command.h>
#include <errno.h>
#include <asm/arch/pmic_bus.h>
#include <axp_pmic.h>
enum axp313_reg {
AXP313_CHIP_VERSION = 0x03,
AXP313_OUTPUT_CTRL = 0x10,
AXP313_DCDC1_CTRL = 0x13,
AXP313_SHUTDOWN = 0x1a,
};
#define AXP313_CHIP_VERSION_MASK 0xcf
#define AXP313_CHIP_VERSION_AXP1530 0x48
#define AXP313_CHIP_VERSION_AXP313A 0x4b
#define AXP313_CHIP_VERSION_AXP313B 0x4c
#define AXP313_DCDC_SPLIT_OFFSET 71
#define AXP313_DCDC_SPLIT_MVOLT 1200
#define AXP313_POWEROFF BIT(7)
static u8 mvolt_to_cfg(int mvolt, int min, int max, int div)
{
if (mvolt < min)
mvolt = min;
else if (mvolt > max)
mvolt = max;
return (mvolt - min) / div;
}
static int axp_set_dcdc(int dcdc_num, unsigned int mvolt)
{
int ret;
u8 cfg, enable_mask = 1U << (dcdc_num - 1);
int volt_reg = AXP313_DCDC1_CTRL + dcdc_num - 1;
int max_mV;
switch (dcdc_num) {
case 1:
case 2:
max_mV = 1540;
break;
case 3:
/*
* The manual defines a different split point, but tests
* show that it's the same 1200mV as for DCDC1/2.
*/
max_mV = 1840;
break;
default:
return -EINVAL;
}
if (mvolt > AXP313_DCDC_SPLIT_MVOLT)
cfg = AXP313_DCDC_SPLIT_OFFSET + mvolt_to_cfg(mvolt,
AXP313_DCDC_SPLIT_MVOLT + 20, max_mV, 20);
else
cfg = mvolt_to_cfg(mvolt, 500, AXP313_DCDC_SPLIT_MVOLT, 10);
if (mvolt == 0)
return pmic_bus_clrbits(AXP313_OUTPUT_CTRL, enable_mask);
debug("DCDC%d: writing 0x%x to reg 0x%x\n", dcdc_num, cfg, volt_reg);
ret = pmic_bus_write(volt_reg, cfg);
if (ret)
return ret;
return pmic_bus_setbits(AXP313_OUTPUT_CTRL, enable_mask);
}
int axp_set_dcdc2(unsigned int mvolt)
{
return axp_set_dcdc(2, mvolt);
}
int axp_set_dcdc3(unsigned int mvolt)
{
return axp_set_dcdc(3, mvolt);
}
int axp_init(void)
{
u8 axp_chip_id;
int ret;
ret = pmic_bus_init();
if (ret)
return ret;
ret = pmic_bus_read(AXP313_CHIP_VERSION, &axp_chip_id);
if (ret)
return ret;
axp_chip_id &= AXP313_CHIP_VERSION_MASK;
switch (axp_chip_id) {
case AXP313_CHIP_VERSION_AXP1530:
case AXP313_CHIP_VERSION_AXP313A:
case AXP313_CHIP_VERSION_AXP313B:
break;
default:
debug("unknown PMIC: 0x%x\n", axp_chip_id);
return -EINVAL;
}
return ret;
}
#if !CONFIG_IS_ENABLED(ARM_PSCI_FW) && !IS_ENABLED(CONFIG_SYSRESET_CMD_POWEROFF)
int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
pmic_bus_write(AXP313_SHUTDOWN, AXP313_POWEROFF);
/* infinite loop during shutdown */
while (1) {}
/* not reached */
return 0;
}
#endif
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