From 584d98be3b90f00b410288e59eeba871fbf81b86 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Thu, 11 Oct 2007 23:46:09 +0100 Subject: [MIPS] Jazz clockevent driver Signed-off-by: Ralf Baechle --- arch/mips/jazz/irq.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) (limited to 'arch/mips/jazz/irq.c') diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c index 5623541..835b056 100644 --- a/arch/mips/jazz/irq.c +++ b/arch/mips/jazz/irq.c @@ -6,6 +6,7 @@ * Copyright (C) 1992 Linus Torvalds * Copyright (C) 1994 - 2001, 2003 Ralf Baechle */ +#include #include #include #include @@ -105,3 +106,50 @@ asmlinkage void plat_irq_dispatch(void) panic("Unimplemented loc_no_irq handler"); } } + +static void r4030_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + /* Nothing to do ... */ +} + +struct clock_event_device r4030_clockevent = { + .name = "r4030", + .features = CLOCK_EVT_FEAT_PERIODIC, + .rating = 100, + .irq = JAZZ_TIMER_IRQ, + .cpumask = CPU_MASK_CPU0, + .set_mode = r4030_set_mode, +}; + +static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id) +{ + r4030_clockevent.event_handler(&r4030_clockevent); + + return IRQ_HANDLED; +} + +static struct irqaction r4030_timer_irqaction = { + .handler = r4030_timer_interrupt, + .flags = IRQF_DISABLED, + .mask = CPU_MASK_CPU0, + .name = "timer", +}; + +void __init plat_timer_setup(struct irqaction *ignored) +{ + struct irqaction *irq = &r4030_timer_irqaction; + + BUG_ON(HZ != 100); + + /* + * Set clock to 100Hz. + * + * The R4030 timer receives an input clock of 1kHz which is divieded by + * a programmable 4-bit divider. This makes it fairly inflexible. + */ + r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9); + setup_irq(JAZZ_TIMER_IRQ, irq); + + clockevents_register_device(&r4030_clockevent); +} -- cgit v1.1