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IRQCHIP: irq-mips-gic: Add new functions to start/stop the GIC counter

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We add new functions to start and stop the GIC counter since there are no
guarantees the counter will be running after a CPU reset. The GIC counter
is stopped by setting the 29th bit on the GIC Config register and it is
started by clearing that bit.

Signed-off-by: Markos Chandras <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Andrew Bresticker <[email protected]>
Cc: Qais Yousef <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/9594/
Signed-off-by: Ralf Baechle <[email protected]>
This commit is contained in:
Markos Chandras 2015-03-23 12:32:01 +00:00 • committed by Ralf Baechle
commit 8fa4b93067
2 changed files with 23 additions and 0 deletions
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21
drivers/irqchip/irq-mips-gic.c
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@ -166,6 +166,27 @@ cycle_t gic_read_compare(void)
return (((cycle_t) hi) << 32) + lo;
}
void gic_start_count(void)
{
u32 gicconfig;
/* Start the counter */
gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF);
gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
}
void gic_stop_count(void)
{
u32 gicconfig;
/* Stop the counter */
gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF;
gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
}
#endif
static bool gic_local_irq_is_routable(int intr)