threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/ia64/sn/kernel/sn2/timer.c
|
|
*
|
|
* Copyright (C) 2003 Silicon Graphics, Inc.
|
|
* Copyright (C) 2003 Hewlett-Packard Co
|
|
* David Mosberger <davidm@hpl.hp.com>: updated for new timer-interpolation infrastructure
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/time.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/clocksource.h>
|
|
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/timex.h>
|
|
|
|
#include <asm/sn/leds.h>
|
|
#include <asm/sn/shub_mmr.h>
|
|
#include <asm/sn/clksupport.h>
|
|
|
|
extern unsigned long sn_rtc_cycles_per_second;
|
|
|
|
static u64 read_sn2(struct clocksource *cs)
|
|
{
|
|
return (u64)readq(RTC_COUNTER_ADDR);
|
|
}
|
|
|
|
static struct clocksource clocksource_sn2 = {
|
|
.name = "sn2_rtc",
|
|
.rating = 450,
|
|
.read = read_sn2,
|
|
.mask = (1LL << 55) - 1,
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
/*
|
|
* sn udelay uses the RTC instead of the ITC because the ITC is not
|
|
* synchronized across all CPUs, and the thread may migrate to another CPU
|
|
* if preemption is enabled.
|
|
*/
|
|
static void
|
|
ia64_sn_udelay (unsigned long usecs)
|
|
{
|
|
unsigned long start = rtc_time();
|
|
unsigned long end = start +
|
|
usecs * sn_rtc_cycles_per_second / 1000000;
|
|
|
|
while (time_before((unsigned long)rtc_time(), end))
|
|
cpu_relax();
|
|
}
|
|
|
|
void __init sn_timer_init(void)
|
|
{
|
|
clocksource_sn2.archdata.fsys_mmio = RTC_COUNTER_ADDR;
|
|
clocksource_register_hz(&clocksource_sn2, sn_rtc_cycles_per_second);
|
|
|
|
ia64_udelay = &ia64_sn_udelay;
|
|
}
|