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https://github.com/AsahiLinux/u-boot
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c537a36839
Use the MEMA - MEMD registers on the PFUZE100 as bootcount registers. Based on work from Heiko Schocher <hs@denx.de>. Signed-off-by: Philip Oberfichtner <pro@denx.de>
161 lines
3.2 KiB
C
161 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018-2022 Denx Software Engineering GmbH
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* Heiko Schocher <hs@denx.de>
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* Philip Oberfichtner <pro@denx.de>
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*
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* A bootcount driver using the registers MEMA - MEMD on the PFUZE100.
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* This works only, if the PMIC is not connected.
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*/
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#include <common.h>
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#include <bootcount.h>
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#include <dm.h>
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#include <power/pmic.h>
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#include <power/pfuze100_pmic.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define PFUZE_BC_MAGIC 0xdead
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struct bootcount_pmic_priv {
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struct udevice *pmic;
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};
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static int pfuze100_get_magic(struct udevice *dev, u32 *magic)
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{
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int ret;
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ret = pmic_reg_read(dev, PFUZE100_MEMA);
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if (ret < 0)
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return ret;
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*magic = ret;
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ret = pmic_reg_read(dev, PFUZE100_MEMB);
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if (ret < 0)
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return ret;
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*magic += ret << 8;
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return 0;
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}
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static int pfuze100_set_magic(struct udevice *dev)
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{
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int ret;
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ret = pmic_reg_write(dev, PFUZE100_MEMA, PFUZE_BC_MAGIC & 0xff);
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if (ret)
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return ret;
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ret = pmic_reg_write(dev, PFUZE100_MEMB, (PFUZE_BC_MAGIC >> 8) & 0xff);
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return ret;
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}
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static int pfuze100_get_value(struct udevice *dev, u32 *a)
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{
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int ret;
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ret = pmic_reg_read(dev, PFUZE100_MEMC);
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if (ret < 0)
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return ret;
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*a = ret;
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ret = pmic_reg_read(dev, PFUZE100_MEMD);
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if (ret < 0)
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return ret;
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*a += ret << 8;
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return 0;
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}
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static int pfuze100_set_value(struct udevice *dev, u32 val)
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{
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int ret;
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ret = pmic_reg_write(dev, PFUZE100_MEMC, val & 0xff);
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if (ret)
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return ret;
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ret = pmic_reg_write(dev, PFUZE100_MEMD, (val >> 8) & 0xff);
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return ret;
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}
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static int bootcount_pmic_set(struct udevice *dev, const u32 a)
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{
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struct bootcount_pmic_priv *priv = dev_get_priv(dev);
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if (pfuze100_set_magic(priv->pmic)) {
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debug("%s: writing magic failed\n", __func__);
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return -EIO;
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}
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if (pfuze100_set_value(priv->pmic, a)) {
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debug("%s: writing value failed\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int bootcount_pmic_get(struct udevice *dev, u32 *a)
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{
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struct bootcount_pmic_priv *priv = dev_get_priv(dev);
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u32 magic;
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if (pfuze100_get_magic(priv->pmic, &magic)) {
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debug("%s: reading magic failed\n", __func__);
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return -EIO;
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}
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if (magic != PFUZE_BC_MAGIC) {
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*a = 0;
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return 0;
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}
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if (pfuze100_get_value(priv->pmic, a)) {
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debug("%s: reading value failed\n", __func__);
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return -EIO;
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}
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return 0;
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}
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static int bootcount_pmic_probe(struct udevice *dev)
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{
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struct ofnode_phandle_args phandle_args;
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struct bootcount_pmic_priv *priv = dev_get_priv(dev);
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struct udevice *pmic;
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if (dev_read_phandle_with_args(dev, "pmic", NULL, 0, 0, &phandle_args)) {
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debug("%s: pmic backing device not specified\n", dev->name);
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return -ENOENT;
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}
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if (uclass_get_device_by_ofnode(UCLASS_PMIC, phandle_args.node, &pmic)) {
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debug("%s: could not get backing device\n", dev->name);
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return -ENODEV;
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}
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priv->pmic = pmic;
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return 0;
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}
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static const struct bootcount_ops bootcount_pmic_ops = {
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.get = bootcount_pmic_get,
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.set = bootcount_pmic_set,
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};
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static const struct udevice_id bootcount_pmic_ids[] = {
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{ .compatible = "u-boot,bootcount-pmic" },
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{ }
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};
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U_BOOT_DRIVER(bootcount_pmic) = {
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.name = "bootcount-pmic",
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.id = UCLASS_BOOTCOUNT,
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.priv_auto = sizeof(struct bootcount_pmic_priv),
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.probe = bootcount_pmic_probe,
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.of_match = bootcount_pmic_ids,
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.ops = &bootcount_pmic_ops,
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};
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