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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-01-15 21:49:23 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-04-29 17:04:16 (GMT) |
commit | 13edd86d7a8b64735c60c308faac785a6f2257b2 (patch) | |
tree | 94fefea5ea04b46a005154981ffcb66cd50e12b7 /arch/arm/mach-integrator/core.c | |
parent | b9cedda230793cbf58eb012ddadedd490cc8e129 (diff) | |
download | linux-13edd86d7a8b64735c60c308faac785a6f2257b2.tar.xz |
ARM: Integrator: convert to generic clockevent support
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-integrator/core.c')
-rw-r--r-- | arch/arm/mach-integrator/core.c | 107 |
1 files changed, 73 insertions, 34 deletions
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c index 87c6f98..b1ccbe3 100644 --- a/arch/arm/mach-integrator/core.c +++ b/arch/arm/mach-integrator/core.c @@ -20,6 +20,7 @@ #include <linux/amba/bus.h> #include <linux/amba/serial.h> #include <linux/clocksource.h> +#include <linux/clockchips.h> #include <linux/io.h> #include <asm/clkdev.h> @@ -275,61 +276,99 @@ static void integrator_clocksource_init(u32 khz) clocksource_register(cs); } +static void __iomem * const clkevt_base = (void __iomem *)TIMER1_VA_BASE; + /* * IRQ handler for the timer */ -static irqreturn_t -integrator_timer_interrupt(int irq, void *dev_id) +static irqreturn_t integrator_timer_interrupt(int irq, void *dev_id) { - /* - * clear the interrupt - */ - writel(1, TIMER1_VA_BASE + TIMER_INTCLR); + struct clock_event_device *evt = dev_id; + + /* clear the interrupt */ + writel(1, clkevt_base + TIMER_INTCLR); - timer_tick(); + evt->event_handler(evt); return IRQ_HANDLED; } +static void clkevt_set_mode(enum clock_event_mode mode, struct clock_event_device *evt) +{ + u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE; + + BUG_ON(mode == CLOCK_EVT_MODE_ONESHOT); + + if (mode == CLOCK_EVT_MODE_PERIODIC) { + writel(ctrl, clkevt_base + TIMER_CTRL); + writel(timer_reload, clkevt_base + TIMER_LOAD); + ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE; + } + + writel(ctrl, clkevt_base + TIMER_CTRL); +} + +static int clkevt_set_next_event(unsigned long next, struct clock_event_device *evt) +{ + unsigned long ctrl = readl(clkevt_base + TIMER_CTRL); + + writel(ctrl & ~TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL); + writel(next, clkevt_base + TIMER_LOAD); + writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL); + + return 0; +} + +static struct clock_event_device integrator_clockevent = { + .name = "timer1", + .shift = 34, + .features = CLOCK_EVT_FEAT_PERIODIC, + .set_mode = clkevt_set_mode, + .set_next_event = clkevt_set_next_event, + .rating = 300, + .cpumask = cpu_all_mask, +}; + static struct irqaction integrator_timer_irq = { - .name = "Integrator Timer Tick", + .name = "timer", .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, .handler = integrator_timer_interrupt, + .dev_id = &integrator_clockevent, }; -/* - * Set up timer interrupt, and return the current time in seconds. - */ -void __init integrator_time_init(unsigned long reload, unsigned int ctrl) +static void integrator_clockevent_init(u32 khz, unsigned int ctrl) { - unsigned int timer_ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC; + struct clock_event_device *evt = &integrator_clockevent; - integrator_clocksource_init(reload * HZ / 1000); + if (khz * 1000 > 0x100000 * HZ) { + khz /= 256; + ctrl |= TIMER_CTRL_DIV256; + } else if (khz * 1000 > 0x10000 * HZ) { + khz /= 16; + ctrl |= TIMER_CTRL_DIV16; + } - timer_reload = reload; - timer_ctrl |= ctrl; + timer_reload = khz * 1000 / HZ; + writel(ctrl, clkevt_base + TIMER_CTRL); - if (timer_reload > 0x100000) { - timer_reload >>= 8; - timer_ctrl |= TIMER_CTRL_DIV256; - } else if (timer_reload > 0x010000) { - timer_reload >>= 4; - timer_ctrl |= TIMER_CTRL_DIV16; - } + evt->irq = IRQ_TIMERINT1; + evt->mult = div_sc(khz, NSEC_PER_MSEC, evt->shift); + evt->max_delta_ns = clockevent_delta2ns(0xffff, evt); + evt->min_delta_ns = clockevent_delta2ns(0xf, evt); - /* - * Initialise to a known state (all timers off) - */ + setup_irq(IRQ_TIMERINT1, &integrator_timer_irq); + clockevents_register_device(evt); +} + +/* + * Set up timer(s). + */ +void __init integrator_time_init(unsigned long reload, unsigned int ctrl) +{ writel(0, TIMER0_VA_BASE + TIMER_CTRL); writel(0, TIMER1_VA_BASE + TIMER_CTRL); writel(0, TIMER2_VA_BASE + TIMER_CTRL); - writel(timer_reload, TIMER1_VA_BASE + TIMER_LOAD); - writel(timer_reload, TIMER1_VA_BASE + TIMER_VALUE); - writel(timer_ctrl, TIMER1_VA_BASE + TIMER_CTRL); - - /* - * Make irqs happen for the system timer - */ - setup_irq(IRQ_TIMERINT1, &integrator_timer_irq); + integrator_clocksource_init(reload * HZ / 1000); + integrator_clockevent_init(reload * HZ / 1000, ctrl); } |