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[MIPS] pnx8xxx: move to clocksource 

This patch converts PNX8XXX system timer to clocksource restoring PNX8550
support back to live.

Signed-off-by: Vitaly Wool <vitalywool@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Vitaly Wool 2008-01-10 17:10:05 +03:00 committed by Ralf Baechle
parent 320167182d
commit 1b1c5f0d96
1 changed files with 72 additions and 37 deletions
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109
arch/mips/philips/pnx8550/common/time.c
View File

@ -22,7 +22,6 @@
#include <linux/kernel_stat.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
@ -41,11 +40,60 @@ static cycle_t hpt_read(void)
return read_c0_count2();
}
static struct clocksource pnx_clocksource = {
.name = "pnx8xxx",
.rating = 200,
.read = hpt_read,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void timer_ack(void)
{
write_c0_compare(cpj);
}
static irqreturn_t pnx8xxx_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *c = dev_id;
/* clear MATCH, signal the event */
c->event_handler(c);
return IRQ_HANDLED;
}
static struct irqaction pnx8xxx_timer_irq = {
.handler = pnx8xxx_timer_interrupt,
.flags = IRQF_DISABLED | IRQF_PERCPU,
.name = "pnx8xxx_timer",
};
static irqreturn_t monotonic_interrupt(int irq, void *dev_id)
{
/* Timer 2 clear interrupt */
write_c0_compare2(-1);
return IRQ_HANDLED;
}
static struct irqaction monotonic_irqaction = {
.handler = monotonic_interrupt,
.flags = IRQF_DISABLED,
.name = "Monotonic timer",
};
static int pnx8xxx_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
write_c0_compare(delta);
return 0;
}
static struct clock_event_device pnx8xxx_clockevent = {
.name = "pnx8xxx_clockevent",
.features = CLOCK_EVT_FEAT_ONESHOT,
.set_next_event = pnx8xxx_set_next_event,
};
/*
* plat_time_init() - it does the following things:
*
@ -58,11 +106,34 @@ static void timer_ack(void)
__init void plat_time_init(void)
{
unsigned int configPR;
unsigned int n;
unsigned int m;
unsigned int p;
unsigned int pow2p;
clockevents_register_device(&pnx8xxx_clockevent);
clocksource_register(&pnx_clocksource);
setup_irq(PNX8550_INT_TIMER1, &pnx8xxx_timer_irq);
setup_irq(PNX8550_INT_TIMER2, &monotonic_irqaction);
/* Timer 1 start */
configPR = read_c0_config7();
configPR &= ~0x00000008;
write_c0_config7(configPR);
/* Timer 2 start */
configPR = read_c0_config7();
configPR &= ~0x00000010;
write_c0_config7(configPR);
/* Timer 3 stop */
configPR = read_c0_config7();
configPR |= 0x00000020;
write_c0_config7(configPR);
/* PLL0 sets MIPS clock (PLL1 <=> TM1, PLL6 <=> TM2, PLL5 <=> mem) */
/* (but only if CLK_MIPS_CTL select value [bits 3:1] is 1: FIXME) */
@ -87,42 +158,6 @@ __init void plat_time_init(void)
write_c0_count2(0);
write_c0_compare2(0xffffffff);
clocksource_mips.read = hpt_read;
mips_timer_ack = timer_ack;
}
static irqreturn_t monotonic_interrupt(int irq, void *dev_id)
{
/* Timer 2 clear interrupt */
write_c0_compare2(-1);
return IRQ_HANDLED;
}
static struct irqaction monotonic_irqaction = {
.handler = monotonic_interrupt,
.flags = IRQF_DISABLED,
.name = "Monotonic timer",
};
void __init plat_timer_setup(struct irqaction *irq)
{
int configPR;
setup_irq(PNX8550_INT_TIMER1, irq);
setup_irq(PNX8550_INT_TIMER2, &monotonic_irqaction);
/* Timer 1 start */
configPR = read_c0_config7();
configPR &= ~0x00000008;
write_c0_config7(configPR);
/* Timer 2 start */
configPR = read_c0_config7();
configPR &= ~0x00000010;
write_c0_config7(configPR);
/* Timer 3 stop */
configPR = read_c0_config7();
configPR |= 0x00000020;
write_c0_config7(configPR);
}