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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018-2022 Denx Software Engineering GmbH
* Heiko Schocher <hs@denx.de>
* Philip Oberfichtner <pro@denx.de>
*
* A bootcount driver using the registers MEMA - MEMD on the PFUZE100.
* This works only, if the PMIC is not connected to a battery.
*/
#include <common.h>
#include <bootcount.h>
#include <dm.h>
#include <power/pmic.h>
#include <power/pfuze100_pmic.h>
DECLARE_GLOBAL_DATA_PTR;
#define PFUZE_BC_MAGIC 0xdead
struct bootcount_pmic_priv {
struct udevice *pmic;
};
static int pfuze100_get_magic(struct udevice *dev, u32 *magic)
{
int ret;
ret = pmic_reg_read(dev, PFUZE100_MEMA);
if (ret < 0)
return ret;
*magic = ret;
ret = pmic_reg_read(dev, PFUZE100_MEMB);
if (ret < 0)
return ret;
*magic += ret << 8;
return 0;
}
static int pfuze100_set_magic(struct udevice *dev)
{
int ret;
ret = pmic_reg_write(dev, PFUZE100_MEMA, PFUZE_BC_MAGIC & 0xff);
if (ret)
return ret;
ret = pmic_reg_write(dev, PFUZE100_MEMB, (PFUZE_BC_MAGIC >> 8) & 0xff);
return ret;
}
static int pfuze100_get_value(struct udevice *dev, u32 *a)
{
int ret;
ret = pmic_reg_read(dev, PFUZE100_MEMC);
if (ret < 0)
return ret;
*a = ret;
ret = pmic_reg_read(dev, PFUZE100_MEMD);
if (ret < 0)
return ret;
*a += ret << 8;
return 0;
}
static int pfuze100_set_value(struct udevice *dev, u32 val)
{
int ret;
ret = pmic_reg_write(dev, PFUZE100_MEMC, val & 0xff);
if (ret)
return ret;
ret = pmic_reg_write(dev, PFUZE100_MEMD, (val >> 8) & 0xff);
return ret;
}
static int bootcount_pmic_set(struct udevice *dev, const u32 a)
{
struct bootcount_pmic_priv *priv = dev_get_priv(dev);
if (pfuze100_set_magic(priv->pmic)) {
debug("%s: writing magic failed\n", __func__);
return -EIO;
}
if (pfuze100_set_value(priv->pmic, a)) {
debug("%s: writing value failed\n", __func__);
return -EIO;
}
return 0;
}
static int bootcount_pmic_get(struct udevice *dev, u32 *a)
{
struct bootcount_pmic_priv *priv = dev_get_priv(dev);
u32 magic;
if (pfuze100_get_magic(priv->pmic, &magic)) {
debug("%s: reading magic failed\n", __func__);
return -EIO;
}
if (magic != PFUZE_BC_MAGIC) {
*a = 0;
return 0;
}
if (pfuze100_get_value(priv->pmic, a)) {
debug("%s: reading value failed\n", __func__);
return -EIO;
}
return 0;
}
static int bootcount_pmic_probe(struct udevice *dev)
{
struct ofnode_phandle_args phandle_args;
struct bootcount_pmic_priv *priv = dev_get_priv(dev);
struct udevice *pmic;
if (dev_read_phandle_with_args(dev, "pmic", NULL, 0, 0, &phandle_args)) {
debug("%s: pmic backing device not specified\n", dev->name);
return -ENOENT;
}
if (uclass_get_device_by_ofnode(UCLASS_PMIC, phandle_args.node, &pmic)) {
debug("%s: could not get backing device\n", dev->name);
return -ENODEV;
}
priv->pmic = pmic;
return 0;
}
static const struct bootcount_ops bootcount_pmic_ops = {
.get = bootcount_pmic_get,
.set = bootcount_pmic_set,
};
static const struct udevice_id bootcount_pmic_ids[] = {
{ .compatible = "u-boot,bootcount-pmic" },
{ }
};
U_BOOT_DRIVER(bootcount_pmic) = {
.name = "bootcount-pmic",
.id = UCLASS_BOOTCOUNT,
.priv_auto = sizeof(struct bootcount_pmic_priv),
.probe = bootcount_pmic_probe,
.of_match = bootcount_pmic_ids,
.ops = &bootcount_pmic_ops,
};
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