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/*
* Copyright (C) 2013 Jan Luebbe <jlu@pengutronix.de>
*
* 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.
*
*
*/
#include <common.h>
#include <driver.h>
#include <xfuncs.h>
#include <errno.h>
#include <watchdog.h>
#include <reset_source.h>
#include <i2c/i2c.h>
#include <restart.h>
#define DRIVERNAME "da9053"
/* STATUS REGISTERS */
#define DA9053_STATUS_A_REG 1
#define DA9053_STATUS_B_REG 2
#define DA9053_STATUS_C_REG 3
#define DA9053_STATUS_D_REG 4
/* PARK REGISTER */
#define DA9053_PARK_REGISTER DA9053_STATUS_D_REG
/* EVENT REGISTERS */
#define DA9053_EVENT_A_REG 5
#define DA9053_EVENT_B_REG 6
#define DA9053_EVENT_C_REG 7
#define DA9053_EVENT_D_REG 8
#define DA9053_FAULTLOG_REG 9
/* IRQ REGISTERS */
#define DA9053_IRQ_MASK_A_REG 10
#define DA9053_IRQ_MASK_B_REG 11
#define DA9053_IRQ_MASK_C_REG 12
#define DA9053_IRQ_MASK_D_REG 13
/* CONTROL REGISTERS */
#define DA9053_CONTROL_A_REG 14
#define DA9053_CONTROL_B_REG 15
#define DA9053_CONTROL_C_REG 16
#define DA9053_CONTROL_D_REG 17
#define DA9053_PDDIS_REG 18
#define DA9053_INTERFACE_REG 19
#define DA9053_RESET_REG 20
/* FAULT LOG REGISTER BITS */
#define DA9053_FAULTLOG_WAITSET 0X80
#define DA9053_FAULTLOG_NSDSET 0X40
#define DA9053_FAULTLOG_KEYSHUT 0X20
#define DA9053_FAULTLOG_TEMPOVER 0X08
#define DA9053_FAULTLOG_VDDSTART 0X04
#define DA9053_FAULTLOG_VDDFAULT 0X02
#define DA9053_FAULTLOG_TWDERROR 0X01
/* CONTROL REGISTER B BITS */
#define DA9053_CONTROLB_SHUTDOWN 0X80
#define DA9053_CONTROLB_DEEPSLEEP 0X40
#define DA9053_CONTROLB_WRITEMODE 0X20
#define DA9053_CONTROLB_BBATEN 0X10
#define DA9053_CONTROLB_OTPREADEN 0X08
#define DA9053_CONTROLB_AUTOBOOT 0X04
#define DA9053_CONTROLB_ACTDIODE 0X02
#define DA9053_CONTROLB_BUCKMERGE 0X01
/* CONTROL REGISTER D BITS */
#define DA9053_CONTROLD_WATCHDOG 0X80
#define DA9053_CONTROLD_ACCDETEN 0X40
#define DA9053_CONTROLD_GPI1415SD 0X20
#define DA9053_CONTROLD_NONKEYSD 0X10
#define DA9053_CONTROLD_KEEPACTEN 0X08
#define DA9053_CONTROLD_TWDSCALE 0X07
struct da9053_priv {
struct watchdog wd;
struct i2c_client *client;
struct device_d *dev;
struct restart_handler restart;
};
#define wd_to_da9053_priv(x) container_of(x, struct da9053_priv, wd)
static int da9053_reg_read(struct da9053_priv *da9053, u32 reg, u8 *val)
{
int ret;
ret = i2c_read_reg(da9053->client, reg, val, 1);
return ret == 1 ? 0 : ret;
}
static int da9053_reg_write(struct da9053_priv *da9053, u32 reg, u8 val)
{
int ret;
ret = i2c_write_reg(da9053->client, reg, &val, 1);
return ret == 1 ? 0 : ret;
}
static int da9053_park(struct da9053_priv *da9053)
{
int ret;
u8 val;
ret = i2c_read_reg(da9053->client, DA9053_PARK_REGISTER, &val, 1);
return ret == 1 ? 0 : ret;
}
static int da9053_enable_multiwrite(struct da9053_priv *da9053)
{
int ret;
u8 val;
ret = da9053_reg_read(da9053, DA9053_CONTROL_B_REG, &val);
if (ret < 0)
return ret;
if (val & DA9053_CONTROLB_WRITEMODE) {
val &= ~DA9053_CONTROLB_WRITEMODE;
ret = da9053_reg_write(da9053, DA9053_CONTROL_B_REG, val);
if (ret < 0)
return ret;
}
ret = da9053_park(da9053);
if (ret < 0)
return ret;
return 0;
}
static int da9053_set_timeout(struct watchdog *wd, unsigned timeout)
{
struct da9053_priv *da9053 = wd_to_da9053_priv(wd);
struct device_d *dev = da9053->dev;
unsigned scale = 0;
int ret;
u8 val;
if (timeout > 131)
return -EINVAL;
if (timeout) {
timeout *= 1000; /* convert to ms */
scale = 0;
while (timeout > (2048 << scale) && scale <= 6)
scale++;
dev_dbg(dev, "calculated TWDSCALE=%u (req=%ims calc=%ims)\n",
scale, timeout, 2048 << scale);
scale++; /* scale 0 disables the WD */
}
ret = da9053_reg_read(da9053, DA9053_CONTROL_D_REG, &val);
if (ret < 0)
return ret;
dev_dbg(dev, "read watchdog (val=0x%02x)\n", val);
if (scale && scale == (val & DA9053_CONTROLD_TWDSCALE)) {
/* trigger WD */
val |= DA9053_CONTROLD_WATCHDOG;
ret = da9053_reg_write(da9053, DA9053_CONTROL_D_REG, val);
if (ret < 0)
return ret;
dev_dbg(dev, "triggered watchdog (val=0x%02x)\n", val);
} else {
/* disable WD first */
val &= ~DA9053_CONTROLD_TWDSCALE;
ret = da9053_reg_write(da9053, DA9053_CONTROL_D_REG, val);
if (ret < 0)
return ret;
dev_dbg(dev, "disabled watchdog (val=0x%02x)\n", val);
if (scale) {
/* park before waiting */
ret = da9053_park(da9053);
if (ret < 0)
return ret;
/* wait required time */
udelay(150);
/* enable WD with new timeout */
val |= scale;
ret = da9053_reg_write(da9053, DA9053_CONTROL_D_REG, val);
if (ret < 0)
return ret;
dev_dbg(dev, "enabled watchdog (val=0x%02x)\n", val);
}
}
ret = da9053_park(da9053);
if (ret < 0)
return ret;
return 0;
}
static void da9053_detect_reset_source(struct da9053_priv *da9053)
{
enum reset_src_type type;
int ret;
u8 val;
ret = da9053_reg_read(da9053, DA9053_FAULTLOG_REG, &val);
if (ret < 0)
return;
ret = da9053_park(da9053);
if (ret < 0)
return;
if (val & DA9053_FAULTLOG_TWDERROR)
type = RESET_WDG;
else if (val & DA9053_FAULTLOG_VDDFAULT)
type = RESET_POR;
else if (val & DA9053_FAULTLOG_NSDSET)
type = RESET_RST;
else
return;
reset_source_set_device(da9053->dev, type);
ret = da9053_reg_write(da9053, DA9053_FAULTLOG_REG, val);
if (ret < 0)
return;
}
static void __noreturn da9053_force_system_reset(struct restart_handler *rst)
{
struct da9053_priv *da9053 = container_of(rst, struct da9053_priv, restart);
u8 val;
int ret;
ret = da9053_reg_read(da9053, DA9053_CONTROL_B_REG, &val);
if (ret < 0)
hang();
val |= DA9053_CONTROLB_SHUTDOWN;
ret = da9053_reg_write(da9053, DA9053_CONTROL_B_REG, val);
if (ret < 0)
hang();
da9053_park(da9053);
hang();
}
static int da9053_probe(struct device_d *dev)
{
struct da9053_priv *da9053;
int ret;
da9053 = xzalloc(sizeof(*da9053));
da9053->dev = dev;
da9053->client = to_i2c_client(dev);
da9053->wd.set_timeout = da9053_set_timeout;
da9053->wd.hwdev = dev;
ret = da9053_enable_multiwrite(da9053);
if (ret < 0)
return ret;
ret = watchdog_register(&da9053->wd);
if (ret)
return ret;
da9053_detect_reset_source(da9053);
da9053->restart.priority = of_get_restart_priority(dev->device_node);
da9053->restart.name = "da9063";
da9053->restart.restart = &da9053_force_system_reset;
restart_handler_register(&da9053->restart);
return 0;
}
static __maybe_unused struct of_device_id da9053_dt_ids[] = {
{
.compatible = "dlg,da9052",
}, {
/* sentinel */
}
};
static struct driver_d da9053_driver = {
.name = DRIVERNAME,
.probe = da9053_probe,
.of_compatible = DRV_OF_COMPAT(da9053_dt_ids),
};
device_i2c_driver(da9053_driver);
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