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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>
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c), Vaisala Oyj
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <reboot-mode/reboot-mode-rtc.h>
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#include <reboot-mode/reboot-mode.h>
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#include <rtc.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int reboot_mode_get(struct udevice *dev, u32 *buf)
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{
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if (!buf)
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return -EINVAL;
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int ret;
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u8 *val = (u8 *)buf;
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struct reboot_mode_rtc_platdata *plat_data;
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plat_data = dev_get_plat(dev);
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if (!plat_data)
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return -EINVAL;
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for (int i = 0; i < plat_data->size; i++) {
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ret = rtc_read8(plat_data->rtc, plat_data->addr + i);
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if (ret < 0)
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return ret;
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val[i] = ret;
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}
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if (plat_data->is_big_endian)
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*buf = __be32_to_cpu(*buf);
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else
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*buf = __le32_to_cpu(*buf);
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return 0;
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}
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static int reboot_mode_set(struct udevice *dev, u32 buf)
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{
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int ret;
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u8 *val;
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struct reboot_mode_rtc_platdata *plat_data;
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plat_data = dev_get_plat(dev);
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if (!plat_data)
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return -EINVAL;
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if (plat_data->is_big_endian)
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buf = __cpu_to_be32(buf);
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else
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buf = __cpu_to_le32(buf);
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val = (u8 *)&buf;
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for (int i = 0; i < plat_data->size; i++) {
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ret = rtc_write8(plat_data->rtc, (plat_data->addr + i), val[i]);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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static int reboot_mode_ofdata_to_platdata(struct udevice *dev)
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{
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struct ofnode_phandle_args phandle_args;
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struct reboot_mode_rtc_platdata *plat_data;
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plat_data = dev_get_plat(dev);
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if (!plat_data)
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return -EINVAL;
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if (dev_read_phandle_with_args(dev, "rtc", NULL, 0, 0, &phandle_args)) {
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dev_err(dev, "RTC device not specified\n");
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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,
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&plat_data->rtc)) {
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dev_err(dev, "could not get the RTC device\n");
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return -ENODEV;
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}
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plat_data->addr =
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dev_read_addr_size_index(dev, 0, (fdt_size_t *)&plat_data->size);
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if (plat_data->addr == FDT_ADDR_T_NONE) {
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dev_err(dev, "Invalid RTC address\n");
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return -EINVAL;
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}
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if (plat_data->size > sizeof(u32)) {
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dev_err(dev, "Invalid reg size\n");
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return -EINVAL;
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}
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plat_data->is_big_endian = ofnode_read_bool(dev_ofnode(dev), "big-endian");
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return 0;
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}
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static const struct udevice_id reboot_mode_ids[] = {
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{ .compatible = "reboot-mode-rtc", 0 },
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{}
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};
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#endif
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static const struct reboot_mode_ops reboot_mode_rtc_ops = {
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.get = reboot_mode_get,
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.set = reboot_mode_set,
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};
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U_BOOT_DRIVER(reboot_mode_rtc) = {
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.name = "reboot-mode-rtc",
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.id = UCLASS_REBOOT_MODE,
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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.of_match = reboot_mode_ids,
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.of_to_plat = reboot_mode_ofdata_to_platdata,
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#endif
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.plat_auto = sizeof(struct reboot_mode_rtc_platdata),
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.ops = &reboot_mode_rtc_ops,
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};
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