mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-24 03:53:31 +00:00
bda5f3e7d6
Fix a copy-paste error I did when inserting the comment. Signed-off-by: Philip Oberfichtner <pro@denx.de> Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
161 lines
3.2 KiB
C
161 lines
3.2 KiB
C
// 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,
|
|
};
|