mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 12:41:55 +00:00
193c3cc125
Move the xtime write mode seqlock into timer_tick(), so it only surrounds the call to do_timer(). This avoids a deadlock in update_process_times() ... hrtimer_get_softirq_time() which tries to get a read mode seqlock on xtime, thereby preventing booting. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
|
|
* linux/arch/arm/mach-omap2/timer-gp.c
|
|
*
|
|
* OMAP2 GP timer support.
|
|
*
|
|
* Copyright (C) 2005 Nokia Corporation
|
|
* Author: Paul Mundt <paul.mundt@nokia.com>
|
|
* Juha Yrjölä <juha.yrjola@nokia.com>
|
|
* OMAP Dual-mode timer framework support by Timo Teras
|
|
*
|
|
* Some parts based off of TI's 24xx code:
|
|
*
|
|
* Copyright (C) 2004 Texas Instruments, Inc.
|
|
*
|
|
* Roughly modelled after the OMAP1 MPU timer code.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/time.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/err.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/mach/time.h>
|
|
#include <asm/arch/dmtimer.h>
|
|
|
|
static struct omap_dm_timer *gptimer;
|
|
|
|
static inline void omap2_gp_timer_start(unsigned long load_val)
|
|
{
|
|
omap_dm_timer_set_load(gptimer, 1, 0xffffffff - load_val);
|
|
omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW);
|
|
omap_dm_timer_start(gptimer);
|
|
}
|
|
|
|
static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
omap_dm_timer_write_status(gptimer, OMAP_TIMER_INT_OVERFLOW);
|
|
timer_tick();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction omap2_gp_timer_irq = {
|
|
.name = "gp timer",
|
|
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
|
|
.handler = omap2_gp_timer_interrupt,
|
|
};
|
|
|
|
static void __init omap2_gp_timer_init(void)
|
|
{
|
|
u32 tick_period;
|
|
|
|
omap_dm_timer_init();
|
|
gptimer = omap_dm_timer_request_specific(1);
|
|
BUG_ON(gptimer == NULL);
|
|
|
|
omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_SYS_CLK);
|
|
tick_period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ;
|
|
tick_period -= 1;
|
|
|
|
setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq);
|
|
omap2_gp_timer_start(tick_period);
|
|
}
|
|
|
|
struct sys_timer omap_timer = {
|
|
.init = omap2_gp_timer_init,
|
|
};
|