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MIPS: cevt-r4k: Drop GIC special case

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The cevt-r4k driver used to call into the GIC driver to find whether the
timer was pending, but only with External Interrupt Controller (EIC)
mode, where the Cause.IP bits can't be used as they encode the interrupt
priority level (Cause.RIPL) instead.

However commit e9de688dac ("irqchip: mips-gic: Support local
interrupts") changed the condition from cpu_has_veic to gic_present.
This fails on cores such as P5600 which have a GIC but the local
interrupts aren't routable by the GIC, causing c0_compare_int_usable()
to consider the interrupt unusable so r4k_clockevent_init() fails.

The previous behaviour, added in commit 98b67c37db ("MIPS: Add EIC
support for GIC."), wasn't really correct either as far as I can tell,
since P5600 apparently supports EIC mode too, and in any case the use of
Cause.TI with r2 should have been sufficient anyway since commit
010c108d7a ("MIPS: PowerTV: Fix support for timer interrupts with > 64
external IRQs").

Therefore drop the call into the gic driver altogether, and add a
comment in c0_compare_int_pending() to clarify that Cause.TI does get
checked since MIPS r2.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Fixes: e9de688dac ("irqchip: mips-gic: Support local interrupts")
Reviewed-by: Andrew Bresticker <abrestic@chromium.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven J. Hill <steven.hill@imgtec.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9077/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2015-01-19 12:00:55 +00:00 committed by Ralf Baechle
parent 2d76e9633b
commit ae58d882bf
3 changed files with 1 additions and 14 deletions
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6
arch/mips/kernel/cevt-r4k.c
View file

@ -11,7 +11,6 @@
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/irq.h>
#include <linux/irqchip/mips-gic.h>
#include <asm/time.h>
#include <asm/cevt-r4k.h>
@ -85,10 +84,7 @@ void mips_event_handler(struct clock_event_device *dev)
*/
static int c0_compare_int_pending(void)
{
#ifdef CONFIG_MIPS_GIC
if (gic_present)
return gic_get_timer_pending();
#endif
/* When cpu_has_mips_r2, this checks Cause.TI instead of Cause.IP7 */
return (read_c0_cause() >> cp0_compare_irq_shift) & (1ul << CAUSEB_IP);
}

8
drivers/irqchip/irq-mips-gic.c
View file

@ -191,14 +191,6 @@ static bool gic_local_irq_is_routable(int intr)
}
}
unsigned int gic_get_timer_pending(void)
{
unsigned int vpe_pending;
vpe_pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
return vpe_pending & GIC_VPE_PEND_TIMER_MSK;
}
static void gic_bind_eic_interrupt(int irq, int set)
{
/* Convert irq vector # to hw int # */

1
include/linux/irqchip/mips-gic.h
View file

@ -243,7 +243,6 @@ extern void gic_write_cpu_compare(cycle_t cnt, int cpu);
extern void gic_send_ipi(unsigned int intr);
extern unsigned int plat_ipi_call_int_xlate(unsigned int);
extern unsigned int plat_ipi_resched_int_xlate(unsigned int);
extern unsigned int gic_get_timer_pending(void);
extern int gic_get_c0_compare_int(void);
extern int gic_get_c0_perfcount_int(void);
#endif /* __LINUX_IRQCHIP_MIPS_GIC_H */