0545e9dc6d
commit d1edce71135cc6d98c0a4b5729774542b676e769 Author: sophgo-forum-service <forum_service@sophgo.com> Date: Fri Mar 15 16:07:33 2024 +0800 [fix] recommend using ssh method to clone repo. [fix] fix sensor driver repo branch name.
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/kernel/archtimer.c
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*
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* Use arch timer before time_init()
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*
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/time.h>
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#include <linux/time_namespace.h>
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#include <linux/timex.h>
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#include <linux/kernel_stat.h>
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#include <linux/early_time_log.h>
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#define MAX_EARLY_TIME_LOGS 16
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struct early_time_entry {
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u64 us;
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const char *name;
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};
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static struct early_time_entry early_time_logs[MAX_EARLY_TIME_LOGS];
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static int early_time_logs_idx;
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#if defined(CONFIG_ARM_ARCH_TIMER)
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#include <asm/arch_timer.h>
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u64 early_time_get_us(void)
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{
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u64 c = __arch_counter_get_cntpct();
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u64 f = arch_timer_get_cntfrq();
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do_div(f, 1000000);
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do_div(c, f);
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return c;
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}
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#elif defined(CONFIG_RISCV_TIMER)
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u64 early_time_get_us(void)
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{
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cycles_t c = get_cycles();
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u32 f = 25000000 / 1000000;
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do_div(c, f);
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return c;
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}
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#endif
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void early_time_log(const char *name)
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{
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u64 now_us = early_time_get_us();
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pr_info("%s: %s: %lluus\n", __func__, name, (unsigned long long)now_us);
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if (early_time_logs_idx < MAX_EARLY_TIME_LOGS) {
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early_time_logs[early_time_logs_idx].us = now_us;
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early_time_logs[early_time_logs_idx].name = name;
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early_time_logs_idx++;
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}
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}
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EXPORT_SYMBOL_GPL(early_time_log);
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static int early_time_log_proc_show(struct seq_file *m, void *v)
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{
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int i;
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seq_printf(m, "now: %lluus\n", early_time_get_us());
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for (i = 0; i < early_time_logs_idx; i++) {
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seq_printf(m, "%s: %lluus\n", early_time_logs[i].name,
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(unsigned long long)early_time_logs[i].us);
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}
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return 0;
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}
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static int __init early_time_log_init(void)
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{
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proc_create_single("early_time_log", 0, NULL, early_time_log_proc_show);
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return 0;
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}
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fs_initcall(early_time_log_init);
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