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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
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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 <log.h>
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#include <rtc.h>
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static const u8 bootcount_magic = 0xbc;
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struct bootcount_rtc_priv {
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struct udevice *rtc;
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u32 offset;
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};
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static int bootcount_rtc_set(struct udevice *dev, const u32 a)
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{
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struct bootcount_rtc_priv *priv = dev_get_priv(dev);
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const u16 val = bootcount_magic << 8 | (a & 0xff);
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if (rtc_write16(priv->rtc, priv->offset, val) < 0) {
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debug("%s: rtc_write16 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_rtc_get(struct udevice *dev, u32 *a)
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{
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struct bootcount_rtc_priv *priv = dev_get_priv(dev);
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u16 val;
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if (rtc_read16(priv->rtc, priv->offset, &val) < 0) {
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debug("%s: rtc_write16 failed\n", __func__);
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return -EIO;
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}
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if (val >> 8 == bootcount_magic) {
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*a = val & 0xff;
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return 0;
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}
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debug("%s: bootcount magic does not match on %04x\n", __func__, val);
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return -EIO;
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}
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static int bootcount_rtc_probe(struct udevice *dev)
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{
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struct ofnode_phandle_args phandle_args;
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struct bootcount_rtc_priv *priv = dev_get_priv(dev);
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struct udevice *rtc;
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if (dev_read_phandle_with_args(dev, "rtc", NULL, 0, 0, &phandle_args)) {
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debug("%s: rtc 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_RTC, phandle_args.node, &rtc)) {
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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->rtc = rtc;
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priv->offset = dev_read_u32_default(dev, "offset", 0);
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return 0;
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}
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static const struct bootcount_ops bootcount_rtc_ops = {
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.get = bootcount_rtc_get,
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.set = bootcount_rtc_set,
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};
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static const struct udevice_id bootcount_rtc_ids[] = {
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{ .compatible = "u-boot,bootcount-rtc" },
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{ }
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};
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U_BOOT_DRIVER(bootcount_rtc) = {
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.name = "bootcount-rtc",
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.id = UCLASS_BOOTCOUNT,
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.priv_auto = sizeof(struct bootcount_rtc_priv),
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.probe = bootcount_rtc_probe,
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.of_match = bootcount_rtc_ids,
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.ops = &bootcount_rtc_ops,
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};
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