mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
bc8d12bfd8
Added support for timer_early_get_count() and timer_early_get_rate() This is mostly useful in tracing. Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com> Reviewed-by: Rick Chen <rick@andestech.com>
73 lines
1.6 KiB
C
73 lines
1.6 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>
|
|
* Copyright (C) 2018, Anup Patel <anup@brainfault.org>
|
|
* Copyright (C) 2012 Regents of the University of California
|
|
*
|
|
* RISC-V architecturally-defined generic timer driver
|
|
*
|
|
* This driver provides generic timer support for S-mode U-Boot.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <timer.h>
|
|
#include <asm/csr.h>
|
|
|
|
static u64 notrace riscv_timer_get_count(struct udevice *dev)
|
|
{
|
|
__maybe_unused u32 hi, lo;
|
|
|
|
if (IS_ENABLED(CONFIG_64BIT))
|
|
return csr_read(CSR_TIME);
|
|
|
|
do {
|
|
hi = csr_read(CSR_TIMEH);
|
|
lo = csr_read(CSR_TIME);
|
|
} while (hi != csr_read(CSR_TIMEH));
|
|
|
|
return ((u64)hi << 32) | lo;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(RISCV_SMODE) && 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_SMODE_TIMER_FREQ;
|
|
}
|
|
|
|
/**
|
|
* timer_early_get_count() - Get the timer count before driver model
|
|
*
|
|
*/
|
|
u64 notrace timer_early_get_count(void)
|
|
{
|
|
return riscv_timer_get_count(NULL);
|
|
}
|
|
#endif
|
|
|
|
static int riscv_timer_probe(struct udevice *dev)
|
|
{
|
|
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
|
|
|
|
/* clock frequency was passed from the cpu driver as driver data */
|
|
uc_priv->clock_rate = dev->driver_data;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct timer_ops riscv_timer_ops = {
|
|
.get_count = riscv_timer_get_count,
|
|
};
|
|
|
|
U_BOOT_DRIVER(riscv_timer) = {
|
|
.name = "riscv_timer",
|
|
.id = UCLASS_TIMER,
|
|
.probe = riscv_timer_probe,
|
|
.ops = &riscv_timer_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|