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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * A general-purpose cyclic execution infrastructure, to allow "small"
- * (run-time wise) functions to be executed at a specified frequency.
- * Things like LED blinking or watchdog triggering are examples for such
- * tasks.
- *
- * Copyright (C) 2022 Stefan Roese <sr@denx.de>
- */
- #include <common.h>
- #include <command.h>
- #include <cyclic.h>
- #include <div64.h>
- #include <malloc.h>
- #include <linux/delay.h>
- struct cyclic_demo_info {
- uint delay_us;
- };
- static void cyclic_demo(void *ctx)
- {
- struct cyclic_demo_info *info = ctx;
- /* Just a small dummy delay here */
- udelay(info->delay_us);
- }
- static int do_cyclic_demo(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- struct cyclic_demo_info *info;
- struct cyclic_info *cyclic;
- uint time_ms;
- if (argc < 3)
- return CMD_RET_USAGE;
- info = malloc(sizeof(struct cyclic_demo_info));
- if (!info) {
- printf("out of memory\n");
- return CMD_RET_FAILURE;
- }
- time_ms = simple_strtoul(argv[1], NULL, 0);
- info->delay_us = simple_strtoul(argv[2], NULL, 0);
- /* Register demo cyclic function */
- cyclic = cyclic_register(cyclic_demo, time_ms * 1000, "cyclic_demo",
- info);
- if (!cyclic)
- printf("Registering of cyclic_demo failed\n");
- printf("Registered function \"%s\" to be executed all %dms\n",
- "cyclic_demo", time_ms);
- return 0;
- }
- static int do_cyclic_list(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- struct cyclic_info *cyclic;
- struct hlist_node *tmp;
- u64 cnt, freq;
- hlist_for_each_entry_safe(cyclic, tmp, cyclic_get_list(), list) {
- cnt = cyclic->run_cnt * 1000000ULL * 100ULL;
- freq = lldiv(cnt, timer_get_us() - cyclic->start_time_us);
- printf("function: %s, cpu-time: %lld us, frequency: %lld.%02d times/s\n",
- cyclic->name, cyclic->cpu_time_us,
- lldiv(freq, 100), do_div(freq, 100));
- }
- return 0;
- }
- static char cyclic_help_text[] =
- "demo <cycletime_ms> <delay_us> - register cyclic demo function\n"
- "cyclic list - list cyclic functions\n";
- U_BOOT_CMD_WITH_SUBCMDS(cyclic, "Cyclic", cyclic_help_text,
- U_BOOT_SUBCMD_MKENT(demo, 3, 1, do_cyclic_demo),
- U_BOOT_SUBCMD_MKENT(list, 1, 1, do_cyclic_list));
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