linux/arch/mips/kernel/cevt-gt641xx.c
afzal mohammed ac8fd122e0 MIPS: Replace setup_irq() by request_irq()
request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

remove_irq() has been replaced by free_irq() as well.

There were build error's during previous version, couple of which was
reported by kbuild test robot <lkp@intel.com> of which one was reported
by Thomas Bogendoerfer <tsbogend@alpha.franken.de> as well. There were a
few more issues including build errors, those also have been fixed.

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-03-05 16:47:35 +01:00

147 lines
3.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* GT641xx clockevent routines.
*
* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
*/
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/irq.h>
#include <asm/gt64120.h>
#include <asm/time.h>
static DEFINE_RAW_SPINLOCK(gt641xx_timer_lock);
static unsigned int gt641xx_base_clock;
void gt641xx_set_base_clock(unsigned int clock)
{
gt641xx_base_clock = clock;
}
int gt641xx_timer0_state(void)
{
if (GT_READ(GT_TC0_OFS))
return 0;
GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK);
return 1;
}
static int gt641xx_timer0_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
u32 ctrl;
raw_spin_lock(&gt641xx_timer_lock);
ctrl = GT_READ(GT_TC_CONTROL_OFS);
ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
ctrl |= GT_TC_CONTROL_ENTC0_MSK;
GT_WRITE(GT_TC0_OFS, delta);
GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
raw_spin_unlock(&gt641xx_timer_lock);
return 0;
}
static int gt641xx_timer0_shutdown(struct clock_event_device *evt)
{
u32 ctrl;
raw_spin_lock(&gt641xx_timer_lock);
ctrl = GT_READ(GT_TC_CONTROL_OFS);
ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
raw_spin_unlock(&gt641xx_timer_lock);
return 0;
}
static int gt641xx_timer0_set_oneshot(struct clock_event_device *evt)
{
u32 ctrl;
raw_spin_lock(&gt641xx_timer_lock);
ctrl = GT_READ(GT_TC_CONTROL_OFS);
ctrl &= ~GT_TC_CONTROL_SELTC0_MSK;
ctrl |= GT_TC_CONTROL_ENTC0_MSK;
GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
raw_spin_unlock(&gt641xx_timer_lock);
return 0;
}
static int gt641xx_timer0_set_periodic(struct clock_event_device *evt)
{
u32 ctrl;
raw_spin_lock(&gt641xx_timer_lock);
ctrl = GT_READ(GT_TC_CONTROL_OFS);
ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK;
GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
raw_spin_unlock(&gt641xx_timer_lock);
return 0;
}
static void gt641xx_timer0_event_handler(struct clock_event_device *dev)
{
}
static struct clock_event_device gt641xx_timer0_clockevent = {
.name = "gt641xx-timer0",
.features = CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.irq = GT641XX_TIMER0_IRQ,
.set_next_event = gt641xx_timer0_set_next_event,
.set_state_shutdown = gt641xx_timer0_shutdown,
.set_state_periodic = gt641xx_timer0_set_periodic,
.set_state_oneshot = gt641xx_timer0_set_oneshot,
.tick_resume = gt641xx_timer0_shutdown,
.event_handler = gt641xx_timer0_event_handler,
};
static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id)
{
struct clock_event_device *cd = &gt641xx_timer0_clockevent;
cd->event_handler(cd);
return IRQ_HANDLED;
}
static int __init gt641xx_timer0_clockevent_init(void)
{
struct clock_event_device *cd;
if (!gt641xx_base_clock)
return 0;
GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
cd = &gt641xx_timer0_clockevent;
cd->rating = 200 + gt641xx_base_clock / 10000000;
clockevent_set_clock(cd, gt641xx_base_clock);
cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
cd->max_delta_ticks = 0x7fffffff;
cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
cd->min_delta_ticks = 0x300;
cd->cpumask = cpumask_of(0);
clockevents_register_device(&gt641xx_timer0_clockevent);
return request_irq(GT641XX_TIMER0_IRQ, gt641xx_timer0_interrupt,
IRQF_PERCPU | IRQF_TIMER, "gt641xx_timer0", NULL);
}
arch_initcall(gt641xx_timer0_clockevent_init);