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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* LION Semiconductor LN-9310 switched capacitor converter.
*/
#include "common.h"
#include "console.h"
#include "ln9310.h"
#include "hooks.h"
#include "i2c.h"
#include "util.h"
#define CPUTS(outstr) cputs(CC_CHIPSET, outstr)
#define CPRINTF(format, args...) cprintf(CC_CHIPSET, format, ## args)
#define CPRINTS(format, args...) cprints(CC_CHIPSET, format, ## args)
static int power_good;
int ln9310_power_good(void)
{
return power_good;
}
static inline int raw_read8(int offset, int *value)
{
return i2c_read8(ln9310_config.i2c_port,
ln9310_config.i2c_addr_flags,
offset,
value);
}
static inline int field_update8(int offset, int mask, int value)
{
/* Clear mask and then set value in i2c reg value */
return i2c_field_update8(ln9310_config.i2c_port,
ln9310_config.i2c_addr_flags,
offset,
mask,
value);
}
static void ln9310_irq_deferred(void)
{
int status, val, pg_2to1, pg_3to1;
status = raw_read8(LN9310_REG_INT1, &val);
if (status) {
CPRINTS("LN9310 reading INT1 failed");
return;
}
CPRINTS("LN9310 received interrupt: 0x%x", val);
/* Don't care other interrupts except mode change */
if (!(val & LN9310_INT1_MODE))
return;
/* Check if the device is active in 2:1 or 3:1 switching mode */
status = raw_read8(LN9310_REG_SYS_STS, &val);
if (status) {
CPRINTS("LN9310 reading SYS_STS failed");
return;
}
CPRINTS("LN9310 system status: 0x%x", val);
/* Either 2:1 or 3:1 mode active is treated as PGOOD */
pg_2to1 = !!(val & LN9310_SYS_SWITCHING21_ACTIVE);
pg_3to1 = !!(val & LN9310_SYS_SWITCHING31_ACTIVE);
power_good = pg_2to1 || pg_3to1;
}
DECLARE_DEFERRED(ln9310_irq_deferred);
void ln9310_interrupt(enum gpio_signal signal)
{
hook_call_deferred(&ln9310_irq_deferred_data, 0);
}
static int is_battery_gt_10v(void)
{
int status, val, gt_10v;
CPRINTS("LN9310 checking input voltage, threshold=10V");
/*
* Turn on INFET_OUT_SWITCH_OK comparator;
* configure INFET_OUT_SWITCH_OK to 10V.
*/
field_update8(LN9310_REG_TRACK_CTRL,
LN9310_TRACK_INFET_OUT_SWITCH_OK_EN_MASK |
LN9310_TRACK_INFET_OUT_SWITCH_OK_CFG_MASK,
LN9310_TRACK_INFET_OUT_SWITCH_OK_EN_ON |
LN9310_TRACK_INFET_OUT_SWITCH_OK_CFG_10V);
/* Read INFET_OUT_SWITCH_OK comparator */
status = raw_read8(LN9310_REG_BC_STS_B, &val);
if (status) {
CPRINTS("LN9310 reading BC_STS_B failed");
return -1;
}
CPRINTS("LN9310 BC_STS_B: 0x%x", val);
/*
* If INFET_OUT_SWITCH_OK=0, VIN < 10V
* If INFET_OUT_SWITCH_OK=1, VIN > 10V
*/
gt_10v = !!(val & LN9310_BC_STS_B_INFET_OUT_SWITCH_OK);
CPRINTS("LN9310 battery %s 10V", gt_10v ? ">" : "<");
/* Turn off INFET_OUT_SWITCH_OK comparator */
field_update8(LN9310_REG_TRACK_CTRL,
LN9310_TRACK_INFET_OUT_SWITCH_OK_EN_MASK,
LN9310_TRACK_INFET_OUT_SWITCH_OK_EN_OFF);
return gt_10v;
}
static int ln9310_init_3to1(void)
{
CPRINTS("LN9310 init (3:1 operation)");
/* Enable track protection and SC_OUT configs for 3:1 switching */
field_update8(LN9310_REG_MODE_CHANGE_CFG,
LN9310_MODE_TM_TRACK_MASK |
LN9310_MODE_TM_SC_OUT_PRECHG_MASK |
LN9310_MODE_TM_VIN_OV_CFG_MASK,
LN9310_MODE_TM_TRACK_SWITCH31 |
LN9310_MODE_TM_SC_OUT_PRECHG_SWITCH31 |
LN9310_MODE_TM_VIN_OV_CFG_3S);
/* Enable 3:1 operation mode */
field_update8(LN9310_REG_PWR_CTRL,
LN9310_PWR_OP_MODE_MASK,
LN9310_PWR_OP_MODE_SWITCH31);
/* 3S lower bounde delta configurations */
field_update8(LN9310_REG_SYS_CTRL,
LN9310_SYS_CTRL_LB_DELTA_MASK,
LN9310_SYS_CTRL_LB_DELTA_3S);
return EC_SUCCESS;
}
static int ln9310_init_2to1(void)
{
CPRINTS("LN9310 init (2:1 operation)");
if (is_battery_gt_10v()) {
CPRINTS("LN9310 init stop. Input voltage is too high.");
return EC_ERROR_UNKNOWN;
}
/* Enable track protection and SC_OUT configs for 2:1 switching */
field_update8(LN9310_REG_MODE_CHANGE_CFG,
LN9310_MODE_TM_TRACK_MASK |
LN9310_MODE_TM_SC_OUT_PRECHG_MASK,
LN9310_MODE_TM_TRACK_SWITCH21 |
LN9310_MODE_TM_SC_OUT_PRECHG_SWITCH21);
/* Enable 2:1 operation mode */
field_update8(LN9310_REG_PWR_CTRL,
LN9310_PWR_OP_MODE_MASK,
LN9310_PWR_OP_MODE_SWITCH21);
/* 2S lower bounde delta configurations */
field_update8(LN9310_REG_SYS_CTRL,
LN9310_SYS_CTRL_LB_DELTA_MASK,
LN9310_SYS_CTRL_LB_DELTA_2S);
return EC_SUCCESS;
}
void ln9310_init(void)
{
int status, val;
enum battery_cell_type batt;
batt = board_get_battery_cell_type();
if (batt == BATTERY_CELL_TYPE_3S) {
status = ln9310_init_3to1();
} else if (batt == BATTERY_CELL_TYPE_2S) {
status = ln9310_init_2to1();
} else {
CPRINTS("LN9310 not supported battery type: %d", batt);
return;
}
if (status != EC_SUCCESS)
return;
/* Unmask the MODE change interrupt */
field_update8(LN9310_REG_INT1_MSK,
LN9310_INT1_MODE,
0);
/* Dummy clear all interrupts */
status = raw_read8(LN9310_REG_INT1, &val);
if (status) {
CPRINTS("LN9310 reading INT1 failed");
return;
}
CPRINTS("LN9310 cleared interrupts: 0x%x", val);
}
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