123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2018 Theobroma Systems Design und Consulting GmbH
- */
- #include <common.h>
- #include <bootcount.h>
- #include <dm.h>
- #include <log.h>
- #include <rtc.h>
- static const u8 bootcount_magic = 0xbc;
- struct bootcount_rtc_priv {
- struct udevice *rtc;
- u32 offset;
- };
- static int bootcount_rtc_set(struct udevice *dev, const u32 a)
- {
- struct bootcount_rtc_priv *priv = dev_get_priv(dev);
- const u16 val = bootcount_magic << 8 | (a & 0xff);
- if (rtc_write16(priv->rtc, priv->offset, val) < 0) {
- debug("%s: rtc_write16 failed\n", __func__);
- return -EIO;
- }
- return 0;
- }
- static int bootcount_rtc_get(struct udevice *dev, u32 *a)
- {
- struct bootcount_rtc_priv *priv = dev_get_priv(dev);
- u16 val;
- if (rtc_read16(priv->rtc, priv->offset, &val) < 0) {
- debug("%s: rtc_write16 failed\n", __func__);
- return -EIO;
- }
- if (val >> 8 == bootcount_magic) {
- *a = val & 0xff;
- return 0;
- }
- debug("%s: bootcount magic does not match on %04x\n", __func__, val);
- return -EIO;
- }
- static int bootcount_rtc_probe(struct udevice *dev)
- {
- struct ofnode_phandle_args phandle_args;
- struct bootcount_rtc_priv *priv = dev_get_priv(dev);
- struct udevice *rtc;
- if (dev_read_phandle_with_args(dev, "rtc", NULL, 0, 0, &phandle_args)) {
- debug("%s: rtc backing device not specified\n", dev->name);
- return -ENOENT;
- }
- if (uclass_get_device_by_ofnode(UCLASS_RTC, phandle_args.node, &rtc)) {
- debug("%s: could not get backing device\n", dev->name);
- return -ENODEV;
- }
- priv->rtc = rtc;
- priv->offset = dev_read_u32_default(dev, "offset", 0);
- return 0;
- }
- static const struct bootcount_ops bootcount_rtc_ops = {
- .get = bootcount_rtc_get,
- .set = bootcount_rtc_set,
- };
- static const struct udevice_id bootcount_rtc_ids[] = {
- { .compatible = "u-boot,bootcount-rtc" },
- { }
- };
- U_BOOT_DRIVER(bootcount_rtc) = {
- .name = "bootcount-rtc",
- .id = UCLASS_BOOTCOUNT,
- .priv_auto_alloc_size = sizeof(struct bootcount_rtc_priv),
- .probe = bootcount_rtc_probe,
- .of_match = bootcount_rtc_ids,
- .ops = &bootcount_rtc_ops,
- };
|