1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * A general-purpose cyclic execution infrastructure, to allow "small" 4 * (run-time wise) functions to be executed at a specified frequency. 5 * Things like LED blinking or watchdog triggering are examples for such 6 * tasks. 7 * 8 * Copyright (C) 2022 Stefan Roese <sr@denx.de> 9 */ 10 11#include <common.h> 12#include <command.h> 13#include <cyclic.h> 14#include <div64.h> 15#include <malloc.h> 16#include <linux/delay.h> 17 18struct cyclic_demo_info { 19 uint delay_us; 20}; 21 22static void cyclic_demo(void *ctx) 23{ 24 struct cyclic_demo_info *info = ctx; 25 26 /* Just a small dummy delay here */ 27 udelay(info->delay_us); 28} 29 30static int do_cyclic_demo(struct cmd_tbl *cmdtp, int flag, int argc, 31 char *const argv[]) 32{ 33 struct cyclic_demo_info *info; 34 struct cyclic_info *cyclic; 35 uint time_ms; 36 37 if (argc < 3) 38 return CMD_RET_USAGE; 39 40 info = malloc(sizeof(struct cyclic_demo_info)); 41 if (!info) { 42 printf("out of memory\n"); 43 return CMD_RET_FAILURE; 44 } 45 46 time_ms = simple_strtoul(argv[1], NULL, 0); 47 info->delay_us = simple_strtoul(argv[2], NULL, 0); 48 49 /* Register demo cyclic function */ 50 cyclic = cyclic_register(cyclic_demo, time_ms * 1000, "cyclic_demo", 51 info); 52 if (!cyclic) 53 printf("Registering of cyclic_demo failed\n"); 54 55 printf("Registered function \"%s\" to be executed all %dms\n", 56 "cyclic_demo", time_ms); 57 58 return 0; 59} 60 61static int do_cyclic_list(struct cmd_tbl *cmdtp, int flag, int argc, 62 char *const argv[]) 63{ 64 struct cyclic_info *cyclic; 65 struct hlist_node *tmp; 66 u64 cnt, freq; 67 68 hlist_for_each_entry_safe(cyclic, tmp, cyclic_get_list(), list) { 69 cnt = cyclic->run_cnt * 1000000ULL * 100ULL; 70 freq = lldiv(cnt, timer_get_us() - cyclic->start_time_us); 71 printf("function: %s, cpu-time: %lld us, frequency: %lld.%02d times/s\n", 72 cyclic->name, cyclic->cpu_time_us, 73 lldiv(freq, 100), do_div(freq, 100)); 74 } 75 76 return 0; 77} 78 79U_BOOT_LONGHELP(cyclic, 80 "demo <cycletime_ms> <delay_us> - register cyclic demo function\n" 81 "cyclic list - list cyclic functions\n"); 82 83U_BOOT_CMD_WITH_SUBCMDS(cyclic, "Cyclic", cyclic_help_text, 84 U_BOOT_SUBCMD_MKENT(demo, 3, 1, do_cyclic_demo), 85 U_BOOT_SUBCMD_MKENT(list, 1, 1, do_cyclic_list)); 86