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| author |   Markos Chandras <markos.chandras@imgtec.com> | 2015-03-23 12:32:01 +0000 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2015-03-31 12:04:13 +0200 |
| commit | 8fa4b93067b70a87785279a7c60158e58e4f2f20 (patch) | |
| tree | c3ca4258a2137a8c6ff80ff37643a6bfe80c2411 /drivers/irqchip/irq-mips-gic.c | |
| parent | ttyFDC: Implement KGDB IO operations. (diff) | |
| download | linux-dev-8fa4b93067b70a87785279a7c60158e58e4f2f20.tar.xz linux-dev-8fa4b93067b70a87785279a7c60158e58e4f2f20.zip | |
IRQCHIP: irq-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.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
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
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9594/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/irqchip/irq-mips-gic.c')
| -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 827cf9b9db39..bc48b7dc89ec 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) |