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sh: intc - primary priority masking fixes

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This patch contains various intc fixes for problems reported by
Markus Brunner on the linuxsh-dev mailing list:

http://marc.info/?l=linuxsh-dev&m=118701948224991&w=1

Apart from added comments, the fixes are:

- add intc_set_priority() function prototype to hw_irq.h
- fix off-by-one error in intc_set_priority()
- make sure _INTC_WIDTH() is set for primary priority masking

Big thanks to Markus for finding these problems. Version two fixes
a compile error and an inverted primary check.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Markus Brunner <super.firetwister@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2007-08-17 00:50:44 +09:00 committed by Paul Mundt
parent 5c37e02535
commit 3d37d94e5a
2 changed files with 29 additions and 5 deletions
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33
arch/sh/kernel/cpu/irq/intc.c
View File

@ -206,6 +206,18 @@ static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
{
int i;
/* this doesn't scale well, but...
*
* this function should only be used for cerain uncommon
* operations such as intc_set_priority() and intc_set_sense()
* and in those rare cases performance doesn't matter that much.
* keeping the memory footprint low is more important.
*
* one rather simple way to speed this up and still keep the
* memory footprint down is to make sure the array is sorted
* and then perform a bisect to lookup the irq.
*/
for (i = 0; i < nr_hp; i++) {
if ((hp + i)->irq != irq)
continue;
@ -226,7 +238,7 @@ int intc_set_priority(unsigned int irq, unsigned int prio)
ihp = intc_find_irq(d->prio, d->nr_prio, irq);
if (ihp) {
if (prio >= ((1 << _INTC_WIDTH(ihp->handle)) - 1))
if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
return -EINVAL;
intc_prio_level[irq] = prio;
@ -237,7 +249,7 @@ int intc_set_priority(unsigned int irq, unsigned int prio)
* priority level will be set during next enable()
*/
if (ihp->handle)
if (_INTC_FN(ihp->handle) != REG_FN_ERR)
_intc_enable(irq, ihp->handle);
}
return 0;
@ -457,6 +469,7 @@ static void __init intc_register_irq(struct intc_desc *desc,
intc_enum enum_id,
unsigned int irq)
{
struct intc_handle_int *hp;
unsigned int data[2], primary;
/* Prefer single interrupt source bitmap over other combinations:
@ -495,9 +508,19 @@ static void __init intc_register_irq(struct intc_desc *desc,
/* add irq to d->prio list if priority is available */
if (data[1]) {
(d->prio + d->nr_prio)->irq = irq;
if (!primary) /* only secondary priority can access regs */
(d->prio + d->nr_prio)->handle = data[1];
hp = d->prio + d->nr_prio;
hp->irq = irq;
hp->handle = data[1];
if (primary) {
/*
* only secondary priority should access registers, so
* set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
*/
hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
}
d->nr_prio++;
}

1
include/asm-sh/hw_irq.h
View File

@ -90,6 +90,7 @@ struct intc_desc symbol __initdata = { \
}
void __init register_intc_controller(struct intc_desc *desc);
int intc_set_priority(unsigned int irq, unsigned int prio);
void __init plat_irq_setup(void);