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| author | Markos Chandras <markos.chandras@imgtec.com> | 2015-03-23 12:32:01 +0000 |
|---|---|---|
| committer | Jason Cooper <jason@lakedaemon.net> | 2015-03-29 20:08:23 +0000 |
| commit | fa6ed4cb6fd44ef4c6fad4d9572119d22381f32c (patch) | |
| tree | a6d26f5e387e3dd13c6a7f61bdba4071ea53406c /drivers/irqchip | |
| parent | 00e6743b5b7333a589c7607aa0ed20416831034d (diff) | |
| download | blackbird-op-linux-fa6ed4cb6fd44ef4c6fad4d9572119d22381f32c.tar.gz blackbird-op-linux-fa6ed4cb6fd44ef4c6fad4d9572119d22381f32c.zip | |
irqchip: mips-gic: Add new functions to start/stop the GIC counter
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.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: <linux-kernel@vger.kernel.org>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Link: https://lkml.kernel.org/r/1427113923-9840-2-git-send-email-markos.chandras@imgtec.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-mips-gic.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c index 9acdc080e7ec..f2d269bca789 100644 --- a/drivers/irqchip/irq-mips-gic.c +++ b/drivers/irqchip/irq-mips-gic.c @@ -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) |
