6d78473b3d
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>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <clk.h>
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#include <div64.h>
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#include <dm.h>
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#include <timer.h>
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#include <asm/io.h>
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#include <dm/device-internal.h>
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#include <linux/err.h>
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#define CLINT_MTIME_OFFSET 0xbff8
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#define ACLINT_MTIME_OFFSET 0
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/* mtime register */
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#define MTIME_REG(base, offset) ((ulong)(base) + (offset))
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static u64 notrace riscv_aclint_timer_get_count(struct udevice *dev)
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{
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return readq((void __iomem *)MTIME_REG(dev_get_priv(dev),
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dev_get_driver_data(dev)));
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}
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#if CONFIG_IS_ENABLED(RISCV_MMODE) && IS_ENABLED(CONFIG_TIMER_EARLY)
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/**
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* timer_early_get_rate() - Get the timer rate before driver model
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*/
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unsigned long notrace timer_early_get_rate(void)
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{
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return RISCV_MMODE_TIMER_FREQ;
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}
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/**
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* timer_early_get_count() - Get the timer count before driver model
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*
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*/
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u64 notrace timer_early_get_count(void)
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{
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return readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE,
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RISCV_MMODE_TIMEROFF));
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}
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#endif
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#if CONFIG_IS_ENABLED(RISCV_MMODE) && CONFIG_IS_ENABLED(BOOTSTAGE)
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ulong timer_get_boot_us(void)
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{
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int ret;
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u64 ticks = 0;
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u32 rate;
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ret = dm_timer_init();
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if (!ret) {
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rate = timer_get_rate(gd->timer);
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timer_get_count(gd->timer, &ticks);
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} else {
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rate = RISCV_MMODE_TIMER_FREQ;
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ticks = readq((void __iomem *)MTIME_REG(RISCV_MMODE_TIMERBASE,
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RISCV_MMODE_TIMEROFF));
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}
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/* Below is converted from time(us) = (tick / rate) * 10000000 */
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return lldiv(ticks * 1000, (rate / 1000));
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}
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#endif
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static const struct timer_ops riscv_aclint_timer_ops = {
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.get_count = riscv_aclint_timer_get_count,
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};
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static int riscv_aclint_timer_probe(struct udevice *dev)
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{
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dev_set_priv(dev, dev_read_addr_ptr(dev));
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if (!dev_get_priv(dev))
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return -EINVAL;
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return timer_timebase_fallback(dev);
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}
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static const struct udevice_id riscv_aclint_timer_ids[] = {
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{ .compatible = "riscv,clint0", .data = CLINT_MTIME_OFFSET },
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{ .compatible = "sifive,clint0", .data = CLINT_MTIME_OFFSET },
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{ .compatible = "riscv,aclint-mtimer", .data = ACLINT_MTIME_OFFSET },
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{ }
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};
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U_BOOT_DRIVER(riscv_aclint_timer) = {
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.name = "riscv_aclint_timer",
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.id = UCLASS_TIMER,
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.of_match = riscv_aclint_timer_ids,
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.probe = riscv_aclint_timer_probe,
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.ops = &riscv_aclint_timer_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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