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When CONFIG_PM is enabled, it uses the TOY_MATCH2 interrupt as the system

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timer tick. Prior to this patch, if IDE IRQ probing occured, then the
TOY_MATCH2 interrupt would be permanently disabled, and no system timer
tick occurs. This patch corrects this situation by correctly registering
the TOY_MATCH2 interrupt so that IDE IRQ probing doesn't have adverse
side effects.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Pete Popov 2005-03-13 08:19:05 +00:00 committed by Ralf Baechle
parent 90a67b5909
commit a3701ca487
2 changed files with 26 additions and 15 deletions
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36
arch/mips/au1000/common/irq.c
View File

@ -293,8 +293,30 @@ static struct hw_interrupt_type level_irq_type = {
};
#ifdef CONFIG_PM
void startup_match20_interrupt(void)
void startup_match20_interrupt(void (*handler)(int, void *, struct pt_regs *))
{
static struct irqaction action;
/* This is a big problem.... since we didn't use request_irq
when kernel/irq.c calls probe_irq_xxx this interrupt will
be probed for usage. This will end up disabling the device :(
Give it a bogus "action" pointer -- this will keep it from
getting auto-probed!
By setting the status to match that of request_irq() we
can avoid it. --cgray
*/
action.dev_id = handler;
action.flags = 0;
action.mask = 0;
action.name = "Au1xxx TOY";
action.handler = handler;
action.next = NULL;
irq_desc[AU1000_TOY_MATCH2_INT].action = &action;
irq_desc[AU1000_TOY_MATCH2_INT].status
&= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
local_enable_irq(AU1000_TOY_MATCH2_INT);
}
#endif
@ -517,17 +539,7 @@ void intc0_req1_irqdispatch(struct pt_regs *regs)
irq = au_ffs(intc0_req1) - 1;
intc0_req1 &= ~(1<<irq);
#ifdef CONFIG_PM
if (irq == AU1000_TOY_MATCH2_INT) {
mask_and_ack_rise_edge_irq(irq);
counter0_irq(irq, NULL, regs);
local_enable_irq(irq);
}
else
#endif
{
do_IRQ(irq, regs);
}
do_IRQ(irq, regs);
}

5
arch/mips/au1000/common/time.c
View File

@ -50,7 +50,6 @@
#include <linux/mc146818rtc.h>
#include <linux/timex.h>
extern void startup_match20_interrupt(void);
extern void do_softirq(void);
extern volatile unsigned long wall_jiffies;
unsigned long missed_heart_beats = 0;
@ -65,7 +64,7 @@ static unsigned int timerhi = 0, timerlo = 0;
#ifdef CONFIG_PM
#define MATCH20_INC 328
extern void startup_match20_interrupt(void);
extern void startup_match20_interrupt(void (*handler)(int, void *, struct pt_regs *));
static unsigned long last_pc0, last_match20;
#endif
@ -446,7 +445,7 @@ void au1xxx_timer_setup(struct irqaction *irq)
au_writel(last_match20 + MATCH20_INC, SYS_TOYMATCH2);
au_sync();
while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20);
startup_match20_interrupt();
startup_match20_interrupt(counter0_irq);
do_gettimeoffset = do_fast_pm_gettimeoffset;