From 107177b14d8179f864315fc4daed9da777ed30c2 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Fri, 30 Sep 2016 16:13:28 -0700 Subject: ARCv2: intc: default all interrupts to priority 1 ARC HS Cores support configurable multiple interrupt priorities of upto 16 levels. In commit dec2b2849cfcc ("ARCv2: intc: Allow interruption by lowest priority interrupt") we switched to 15 which seems a bit excessive given that there would be rare hardware implementing so many preemption levels AND running Linux. It would seem that 2 levels will be more common so switch to 1 as the default priority level. This will be the "lower" priority level saving 0 for implementing NMI style support. This scheme also works in systems with more than 2 prioity levels as well. Signed-off-by: Vineet Gupta --- arch/arc/kernel/intc-arcv2.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'arch/arc/kernel') diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c index 62b59409a5d9..994dca7014db 100644 --- a/arch/arc/kernel/intc-arcv2.c +++ b/arch/arc/kernel/intc-arcv2.c @@ -14,8 +14,6 @@ #include #include -static int irq_prio; - /* * Early Hardware specific Interrupt setup * -Called very early (start_kernel -> setup_arch -> setup_processor) @@ -24,7 +22,7 @@ static int irq_prio; */ void arc_init_IRQ(void) { - unsigned int tmp; + unsigned int tmp, irq_prio; struct irq_build { #ifdef CONFIG_CPU_BIG_ENDIAN @@ -67,12 +65,12 @@ void arc_init_IRQ(void) irq_prio = irq_bcr.prio; /* Encoded as N-1 for N levels */ pr_info("archs-intc\t: %d priority levels (default %d)%s\n", - irq_prio + 1, irq_prio, + irq_prio + 1, ARCV2_IRQ_DEF_PRIO, irq_bcr.firq ? " FIRQ (not used)":""); /* setup status32, don't enable intr yet as kernel doesn't want */ tmp = read_aux_reg(0xa); - tmp |= STATUS_AD_MASK | (irq_prio << 1); + tmp |= STATUS_AD_MASK | (ARCV2_IRQ_DEF_PRIO << 1); tmp &= ~STATUS_IE_MASK; asm volatile("kflag %0 \n"::"r"(tmp)); } @@ -93,7 +91,7 @@ void arcv2_irq_enable(struct irq_data *data) { /* set default priority */ write_aux_reg(AUX_IRQ_SELECT, data->irq); - write_aux_reg(AUX_IRQ_PRIORITY, irq_prio); + write_aux_reg(AUX_IRQ_PRIORITY, ARCV2_IRQ_DEF_PRIO); /* * hw auto enables (linux unmask) all by default -- cgit v1.2.3