mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 11:00:15 +00:00
c74675bd90
RTC devices could provide battery-backed memory that can be used for storing the reboot mode magic value. Add a new reboot-mode back-end that uses RTC to store the reboot-mode magic value. The driver also supports both endianness modes. Signed-off-by: Nandor Han <nandor.han@vaisala.com> Reviewed-by: Simon Glass <sjg@chromium.org>
127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c), Vaisala Oyj
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <dm/device_compat.h>
|
|
#include <reboot-mode/reboot-mode-rtc.h>
|
|
#include <reboot-mode/reboot-mode.h>
|
|
#include <rtc.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static int reboot_mode_get(struct udevice *dev, u32 *buf)
|
|
{
|
|
if (!buf)
|
|
return -EINVAL;
|
|
|
|
int ret;
|
|
u8 *val = (u8 *)buf;
|
|
struct reboot_mode_rtc_platdata *plat_data;
|
|
|
|
plat_data = dev_get_plat(dev);
|
|
if (!plat_data)
|
|
return -EINVAL;
|
|
|
|
for (int i = 0; i < plat_data->size; i++) {
|
|
ret = rtc_read8(plat_data->rtc, plat_data->addr + i);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
val[i] = ret;
|
|
}
|
|
|
|
if (plat_data->is_big_endian)
|
|
*buf = __be32_to_cpu(*buf);
|
|
else
|
|
*buf = __le32_to_cpu(*buf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int reboot_mode_set(struct udevice *dev, u32 buf)
|
|
{
|
|
int ret;
|
|
u8 *val;
|
|
struct reboot_mode_rtc_platdata *plat_data;
|
|
|
|
plat_data = dev_get_plat(dev);
|
|
if (!plat_data)
|
|
return -EINVAL;
|
|
|
|
if (plat_data->is_big_endian)
|
|
buf = __cpu_to_be32(buf);
|
|
else
|
|
buf = __cpu_to_le32(buf);
|
|
|
|
val = (u8 *)&buf;
|
|
|
|
for (int i = 0; i < plat_data->size; i++) {
|
|
ret = rtc_write8(plat_data->rtc, (plat_data->addr + i), val[i]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
|
static int reboot_mode_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct ofnode_phandle_args phandle_args;
|
|
struct reboot_mode_rtc_platdata *plat_data;
|
|
|
|
plat_data = dev_get_plat(dev);
|
|
if (!plat_data)
|
|
return -EINVAL;
|
|
|
|
if (dev_read_phandle_with_args(dev, "rtc", NULL, 0, 0, &phandle_args)) {
|
|
dev_err(dev, "RTC device not specified\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (uclass_get_device_by_ofnode(UCLASS_RTC, phandle_args.node,
|
|
&plat_data->rtc)) {
|
|
dev_err(dev, "could not get the RTC device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
plat_data->addr =
|
|
dev_read_addr_size_index(dev, 0, (fdt_size_t *)&plat_data->size);
|
|
if (plat_data->addr == FDT_ADDR_T_NONE) {
|
|
dev_err(dev, "Invalid RTC address\n");
|
|
return -EINVAL;
|
|
}
|
|
if (plat_data->size > sizeof(u32)) {
|
|
dev_err(dev, "Invalid reg size\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
plat_data->is_big_endian = ofnode_read_bool(dev_ofnode(dev), "big-endian");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id reboot_mode_ids[] = {
|
|
{ .compatible = "reboot-mode-rtc", 0 },
|
|
{}
|
|
};
|
|
#endif
|
|
|
|
static const struct reboot_mode_ops reboot_mode_rtc_ops = {
|
|
.get = reboot_mode_get,
|
|
.set = reboot_mode_set,
|
|
};
|
|
|
|
U_BOOT_DRIVER(reboot_mode_rtc) = {
|
|
.name = "reboot-mode-rtc",
|
|
.id = UCLASS_REBOOT_MODE,
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
|
.of_match = reboot_mode_ids,
|
|
.of_to_plat = reboot_mode_ofdata_to_platdata,
|
|
#endif
|
|
.plat_auto = sizeof(struct reboot_mode_rtc_platdata),
|
|
.ops = &reboot_mode_rtc_ops,
|
|
};
|