u-boot/drivers/timer/riscv_aclint_timer.c
Chanho Park 6d78473b3d timer: riscv_aclint_timer: add timer_get_boot_us for BOOTSTAGE
timer_get_boot_us function is required to record the boot stages as
us-based timestamp.
To get a micro-second time from a timer tick, this converts the
formula like below to avoid zero result of (tick / rate) part.

From: time(us) = (tick / rate) * 1000000
To  : time(us) = (tick * 1000) / (rate / 1000)

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
2023-10-04 17:55:37 +08:00

97 lines
2.4 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <clk.h>
#include <div64.h>
#include <dm.h>
#include <timer.h>
#include <asm/io.h>
#include <dm/device-internal.h>
#include <linux/err.h>
#define CLINT_MTIME_OFFSET 0xbff8
#define ACLINT_MTIME_OFFSET 0
/* mtime register */
#define MTIME_REG(base, offset) ((ulong)(base) + (offset))
static u64 notrace riscv_aclint_timer_get_count(struct udevice *dev)
{
return readq((void __iomem *)MTIME_REG(dev_get_priv(dev),
dev_get_driver_data(dev)));
}
#if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY)
/**
* timer_early_get_rate() - Get the timer rate before driver model
*/
unsigned long notrace timer_early_get_rate(void)
{
return RISCV_MMODE_TIMER_FREQ;
}
/**
* timer_early_get_count() - Get the timer count before driver model
*
*/
u64 notrace timer_early_get_count(void)
{
return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE,
RISCV_MMODE_TIMEROFF));
}
#endif
#if CONFIG_IS_ENABLED(RISCV_MMODE) && CONFIG_IS_ENABLED(BOOTSTAGE)
ulong timer_get_boot_us(void)
{
int ret;
u64 ticks = 0;
u32 rate;
ret = dm_timer_init();
if (!ret) {
rate = timer_get_rate(gd->timer);
timer_get_count(gd->timer, &ticks);
} else {
rate = RISCV_MMODE_TIMER_FREQ;
ticks = readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE,
RISCV_MMODE_TIMEROFF));
}
/* Below is converted from time(us) = (tick / rate) * 10000000 */
return lldiv(ticks * 1000, (rate / 1000));
}
#endif
static const struct timer_ops riscv_aclint_timer_ops = {
.get_count = riscv_aclint_timer_get_count,
};
static int riscv_aclint_timer_probe(struct udevice *dev)
{
dev_set_priv(dev, dev_read_addr_ptr(dev));
if (!dev_get_priv(dev))
return -EINVAL;
return timer_timebase_fallback(dev);
}
static const struct udevice_id riscv_aclint_timer_ids[] = {
{ .compatible = "riscv,clint0", .data = CLINT_MTIME_OFFSET },
{ .compatible = "sifive,clint0", .data = CLINT_MTIME_OFFSET },
{ .compatible = "riscv,aclint-mtimer", .data = ACLINT_MTIME_OFFSET },
{ }
};
U_BOOT_DRIVER(riscv_aclint_timer) = {
.name = "riscv_aclint_timer",
.id = UCLASS_TIMER,
.of_match = riscv_aclint_timer_ids,
.probe = riscv_aclint_timer_probe,
.ops = &riscv_aclint_timer_ops,
.flags = DM_FLAG_PRE_RELOC,
};