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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;
}
U_BOOT_LONGHELP(cyclic,
"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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