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@@ -27,8 +27,10 @@
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#include <linux/of_address.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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-#include <asm/sched_clock.h>
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+#include <asm/sched_clock.h>
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+#include <asm/localtimer.h>
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+#include <linux/percpu.h>
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/*
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* Timer block registers.
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*/
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@@ -49,6 +51,7 @@
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#define TIMER1_RELOAD_OFF 0x0018
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#define TIMER1_VAL_OFF 0x001c
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+#define LCL_TIMER_EVENTS_STATUS 0x0028
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/* Global timers are connected to the coherency fabric clock, and the
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below divider reduces their incrementing frequency. */
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#define TIMER_DIVIDER_SHIFT 5
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@@ -57,14 +60,17 @@
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/*
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* SoC-specific data.
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*/
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-static void __iomem *timer_base;
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-static int timer_irq;
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+static void __iomem *timer_base, *local_base;
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+static unsigned int timer_clk;
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+static bool timer25Mhz = true;
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/*
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* Number of timer ticks per jiffy.
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*/
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static u32 ticks_per_jiffy;
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+static struct clock_event_device __percpu **percpu_armada_370_xp_evt;
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+
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static u32 notrace armada_370_xp_read_sched_clock(void)
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{
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return ~readl(timer_base + TIMER0_VAL_OFF);
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@@ -78,24 +84,23 @@ armada_370_xp_clkevt_next_event(unsigned long delta,
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struct clock_event_device *dev)
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{
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u32 u;
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-
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/*
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* Clear clockevent timer interrupt.
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*/
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- writel(TIMER1_CLR_MASK, timer_base + TIMER_EVENTS_STATUS);
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+ writel(TIMER0_CLR_MASK, local_base + LCL_TIMER_EVENTS_STATUS);
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/*
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* Setup new clockevent timer value.
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*/
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- writel(delta, timer_base + TIMER1_VAL_OFF);
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+ writel(delta, local_base + TIMER0_VAL_OFF);
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/*
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* Enable the timer.
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*/
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- u = readl(timer_base + TIMER_CTRL_OFF);
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- u = ((u & ~TIMER1_RELOAD_EN) | TIMER1_EN |
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- TIMER1_DIV(TIMER_DIVIDER_SHIFT));
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- writel(u, timer_base + TIMER_CTRL_OFF);
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+ u = readl(local_base + TIMER_CTRL_OFF);
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+ u = ((u & ~TIMER0_RELOAD_EN) | TIMER0_EN |
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+ TIMER0_DIV(TIMER_DIVIDER_SHIFT));
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+ writel(u, local_base + TIMER_CTRL_OFF);
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return 0;
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}
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@@ -107,37 +112,38 @@ armada_370_xp_clkevt_mode(enum clock_event_mode mode,
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u32 u;
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if (mode == CLOCK_EVT_MODE_PERIODIC) {
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+
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/*
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* Setup timer to fire at 1/HZ intervals.
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*/
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- writel(ticks_per_jiffy - 1, timer_base + TIMER1_RELOAD_OFF);
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- writel(ticks_per_jiffy - 1, timer_base + TIMER1_VAL_OFF);
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+ writel(ticks_per_jiffy - 1, local_base + TIMER0_RELOAD_OFF);
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+ writel(ticks_per_jiffy - 1, local_base + TIMER0_VAL_OFF);
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/*
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* Enable timer.
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*/
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- u = readl(timer_base + TIMER_CTRL_OFF);
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- writel((u | TIMER1_EN | TIMER1_RELOAD_EN |
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- TIMER1_DIV(TIMER_DIVIDER_SHIFT)),
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- timer_base + TIMER_CTRL_OFF);
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+ u = readl(local_base + TIMER_CTRL_OFF);
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+
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+ writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
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+ TIMER0_DIV(TIMER_DIVIDER_SHIFT)),
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+ local_base + TIMER_CTRL_OFF);
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} else {
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/*
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* Disable timer.
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*/
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- u = readl(timer_base + TIMER_CTRL_OFF);
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- writel(u & ~TIMER1_EN, timer_base + TIMER_CTRL_OFF);
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+ u = readl(local_base + TIMER_CTRL_OFF);
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+ writel(u & ~TIMER0_EN, local_base + TIMER_CTRL_OFF);
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/*
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* ACK pending timer interrupt.
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*/
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- writel(TIMER1_CLR_MASK, timer_base + TIMER_EVENTS_STATUS);
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-
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+ writel(TIMER0_CLR_MASK, local_base + LCL_TIMER_EVENTS_STATUS);
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}
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}
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static struct clock_event_device armada_370_xp_clkevt = {
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- .name = "armada_370_xp_tick",
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+ .name = "armada_370_xp_per_cpu_tick",
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.features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
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.shift = 32,
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.rating = 300,
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@@ -150,32 +156,78 @@ static irqreturn_t armada_370_xp_timer_interrupt(int irq, void *dev_id)
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/*
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* ACK timer interrupt and call event handler.
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*/
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+ struct clock_event_device *evt = *(struct clock_event_device **)dev_id;
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- writel(TIMER1_CLR_MASK, timer_base + TIMER_EVENTS_STATUS);
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- armada_370_xp_clkevt.event_handler(&armada_370_xp_clkevt);
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+ writel(TIMER0_CLR_MASK, local_base + LCL_TIMER_EVENTS_STATUS);
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+ evt->event_handler(evt);
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return IRQ_HANDLED;
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}
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-static struct irqaction armada_370_xp_timer_irq = {
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- .name = "armada_370_xp_tick",
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- .flags = IRQF_DISABLED | IRQF_TIMER,
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- .handler = armada_370_xp_timer_interrupt
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+/*
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+ * Setup the local clock events for a CPU.
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+ */
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+static int __cpuinit armada_370_xp_timer_setup(struct clock_event_device *evt)
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+{
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+ u32 u;
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+ int cpu = smp_processor_id();
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+
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+ /* Use existing clock_event for cpu 0 */
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+ if (!smp_processor_id())
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+ return 0;
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+
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+ u = readl(local_base + TIMER_CTRL_OFF);
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+ if (timer25Mhz)
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+ writel(u | TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
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+ else
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+ writel(u & ~TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
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+
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+ evt->name = armada_370_xp_clkevt.name;
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+ evt->irq = armada_370_xp_clkevt.irq;
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+ evt->features = armada_370_xp_clkevt.features;
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+ evt->shift = armada_370_xp_clkevt.shift;
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+ evt->rating = armada_370_xp_clkevt.rating,
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+ evt->set_next_event = armada_370_xp_clkevt_next_event,
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+ evt->set_mode = armada_370_xp_clkevt_mode,
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+ evt->cpumask = cpumask_of(cpu);
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+
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+ *__this_cpu_ptr(percpu_armada_370_xp_evt) = evt;
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+
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+ clockevents_config_and_register(evt, timer_clk, 1, 0xfffffffe);
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+ enable_percpu_irq(evt->irq, 0);
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+
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+ return 0;
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+}
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+
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+static void armada_370_xp_timer_stop(struct clock_event_device *evt)
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+{
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+ evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
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+ disable_percpu_irq(evt->irq);
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+}
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+
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+static struct local_timer_ops armada_370_xp_local_timer_ops __cpuinitdata = {
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+ .setup = armada_370_xp_timer_setup,
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+ .stop = armada_370_xp_timer_stop,
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};
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void __init armada_370_xp_timer_init(void)
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{
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u32 u;
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struct device_node *np;
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- unsigned int timer_clk;
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+ int res;
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+
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np = of_find_compatible_node(NULL, NULL, "marvell,armada-370-xp-timer");
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timer_base = of_iomap(np, 0);
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WARN_ON(!timer_base);
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+ local_base = of_iomap(np, 1);
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if (of_find_property(np, "marvell,timer-25Mhz", NULL)) {
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/* The fixed 25MHz timer is available so let's use it */
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+ u = readl(local_base + TIMER_CTRL_OFF);
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+ writel(u | TIMER0_25MHZ,
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+ local_base + TIMER_CTRL_OFF);
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u = readl(timer_base + TIMER_CTRL_OFF);
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- writel(u | TIMER0_25MHZ | TIMER1_25MHZ,
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+ writel(u | TIMER0_25MHZ,
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timer_base + TIMER_CTRL_OFF);
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timer_clk = 25000000;
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} else {
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@@ -183,15 +235,23 @@ void __init armada_370_xp_timer_init(void)
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struct clk *clk = of_clk_get(np, 0);
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WARN_ON(IS_ERR(clk));
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rate = clk_get_rate(clk);
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+ u = readl(local_base + TIMER_CTRL_OFF);
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+ writel(u & ~(TIMER0_25MHZ),
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+ local_base + TIMER_CTRL_OFF);
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+
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u = readl(timer_base + TIMER_CTRL_OFF);
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- writel(u & ~(TIMER0_25MHZ | TIMER1_25MHZ),
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+ writel(u & ~(TIMER0_25MHZ),
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timer_base + TIMER_CTRL_OFF);
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+
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timer_clk = rate / TIMER_DIVIDER;
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+ timer25Mhz = false;
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}
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- /* We use timer 0 as clocksource, and timer 1 for
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- clockevents */
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- timer_irq = irq_of_parse_and_map(np, 1);
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+ /*
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+ * We use timer 0 as clocksource, and private(local) timer 0
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+ * for clockevents
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+ */
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+ armada_370_xp_clkevt.irq = irq_of_parse_and_map(np, 4);
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ticks_per_jiffy = (timer_clk + HZ / 2) / HZ;
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@@ -216,12 +276,26 @@ void __init armada_370_xp_timer_init(void)
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"armada_370_xp_clocksource",
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timer_clk, 300, 32, clocksource_mmio_readl_down);
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- /*
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- * Setup clockevent timer (interrupt-driven).
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- */
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- setup_irq(timer_irq, &armada_370_xp_timer_irq);
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+ /* Register the clockevent on the private timer of CPU 0 */
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armada_370_xp_clkevt.cpumask = cpumask_of(0);
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clockevents_config_and_register(&armada_370_xp_clkevt,
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timer_clk, 1, 0xfffffffe);
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-}
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+ percpu_armada_370_xp_evt = alloc_percpu(struct clock_event_device *);
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+
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+
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+ /*
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+ * Setup clockevent timer (interrupt-driven).
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+ */
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+ *__this_cpu_ptr(percpu_armada_370_xp_evt) = &armada_370_xp_clkevt;
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+ res = request_percpu_irq(armada_370_xp_clkevt.irq,
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+ armada_370_xp_timer_interrupt,
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+ armada_370_xp_clkevt.name,
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+ percpu_armada_370_xp_evt);
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+ if (!res) {
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+ enable_percpu_irq(armada_370_xp_clkevt.irq, 0);
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+#ifdef CONFIG_LOCAL_TIMERS
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+ local_timer_register(&armada_370_xp_local_timer_ops);
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+#endif
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+ }
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+}
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