From fa6ed4cb6fd44ef4c6fad4d9572119d22381f32c Mon Sep 17 00:00:00 2001 From: Markos Chandras Date: Mon, 23 Mar 2015 12:32:01 +0000 Subject: [PATCH] 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 Cc: Jason Cooper Cc: Andrew Bresticker Cc: Qais Yousef Cc: Signed-off-by: Markos Chandras Link: https://lkml.kernel.org/r/1427113923-9840-2-git-send-email-markos.chandras@imgtec.com Signed-off-by: Jason Cooper --- drivers/irqchip/irq-mips-gic.c | 21 +++++++++++++++++++++ include/linux/irqchip/mips-gic.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c index 9acdc08..f2d269b 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) diff --git a/include/linux/irqchip/mips-gic.h b/include/linux/irqchip/mips-gic.h index e6a6aac..3ea2e47 100644 --- a/include/linux/irqchip/mips-gic.h +++ b/include/linux/irqchip/mips-gic.h @@ -240,6 +240,8 @@ extern unsigned int gic_get_count_width(void); extern cycle_t gic_read_compare(void); extern void gic_write_compare(cycle_t cnt); extern void gic_write_cpu_compare(cycle_t cnt, int cpu); +extern void gic_start_count(void); +extern void gic_stop_count(void); 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); -- 2.7.4