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Diffstat (limited to 'arch/arm/mach-ns9xxx/time-ns9360.c')
-rw-r--r--arch/arm/mach-ns9xxx/time-ns9360.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/arm/mach-ns9xxx/time-ns9360.c b/arch/arm/mach-ns9xxx/time-ns9360.c
new file mode 100644
index 000000000000..4d573c9793ed
--- /dev/null
+++ b/arch/arm/mach-ns9xxx/time-ns9360.c
@@ -0,0 +1,185 @@
+/*
+ * arch/arm/mach-ns9xxx/time-ns9360.c
+ *
+ * Copyright (C) 2006,2007 by Digi International Inc.
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/stringify.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+
+#include <asm/arch-ns9xxx/processor-ns9360.h>
+#include <asm/arch-ns9xxx/regs-sys-ns9360.h>
+#include <asm/arch-ns9xxx/irqs.h>
+#include <asm/arch/system.h>
+#include "generic.h"
+
+#define TIMER_CLOCKSOURCE 0
+#define TIMER_CLOCKEVENT 1
+static u32 latch;
+
+static cycle_t ns9360_clocksource_read(void)
+{
+ return __raw_readl(SYS_TR(TIMER_CLOCKSOURCE));
+}
+
+static struct clocksource ns9360_clocksource = {
+ .name = "ns9360-timer" __stringify(TIMER_CLOCKSOURCE),
+ .rating = 300,
+ .read = ns9360_clocksource_read,
+ .mask = CLOCKSOURCE_MASK(32),
+ .shift = 20,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static void ns9360_clockevent_setmode(enum clock_event_mode mode,
+ struct clock_event_device *clk)
+{
+ u32 tc = __raw_readl(SYS_TC(TIMER_CLOCKEVENT));
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ __raw_writel(latch, SYS_TRC(TIMER_CLOCKEVENT));
+ REGSET(tc, SYS_TCx, REN, EN);
+ REGSET(tc, SYS_TCx, INTS, EN);
+ REGSET(tc, SYS_TCx, TEN, EN);
+ break;
+
+ case CLOCK_EVT_MODE_ONESHOT:
+ REGSET(tc, SYS_TCx, REN, DIS);
+ REGSET(tc, SYS_TCx, INTS, EN);
+
+ /* fall through */
+
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
+ default:
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ break;
+ }
+
+ __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
+}
+
+static int ns9360_clockevent_setnextevent(unsigned long evt,
+ struct clock_event_device *clk)
+{
+ u32 tc = __raw_readl(SYS_TC(TIMER_CLOCKEVENT));
+
+ if (REGGET(tc, SYS_TCx, TEN)) {
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
+ }
+
+ REGSET(tc, SYS_TCx, TEN, EN);
+
+ __raw_writel(evt, SYS_TRC(TIMER_CLOCKEVENT));
+
+ __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
+
+ return 0;
+}
+
+static struct clock_event_device ns9360_clockevent_device = {
+ .name = "ns9360-timer" __stringify(TIMER_CLOCKEVENT),
+ .shift = 20,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .set_mode = ns9360_clockevent_setmode,
+ .set_next_event = ns9360_clockevent_setnextevent,
+};
+
+static irqreturn_t ns9360_clockevent_handler(int irq, void *dev_id)
+{
+ int timerno = irq - IRQ_NS9360_TIMER0;
+ u32 tc;
+
+ struct clock_event_device *evt = &ns9360_clockevent_device;
+
+ /* clear irq */
+ tc = __raw_readl(SYS_TC(timerno));
+ if (REGGET(tc, SYS_TCx, REN) == SYS_TCx_REN_DIS) {
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ __raw_writel(tc, SYS_TC(timerno));
+ }
+ REGSET(tc, SYS_TCx, INTC, SET);
+ __raw_writel(tc, SYS_TC(timerno));
+ REGSET(tc, SYS_TCx, INTC, UNSET);
+ __raw_writel(tc, SYS_TC(timerno));
+
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction ns9360_clockevent_action = {
+ .name = "ns9360-timer" __stringify(TIMER_CLOCKEVENT),
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = ns9360_clockevent_handler,
+};
+
+static void __init ns9360_timer_init(void)
+{
+ int tc;
+
+ tc = __raw_readl(SYS_TC(TIMER_CLOCKSOURCE));
+ if (REGGET(tc, SYS_TCx, TEN)) {
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ __raw_writel(tc, SYS_TC(TIMER_CLOCKSOURCE));
+ }
+
+ __raw_writel(0, SYS_TRC(TIMER_CLOCKSOURCE));
+
+ REGSET(tc, SYS_TCx, TEN, EN);
+ REGSET(tc, SYS_TCx, TDBG, STOP);
+ REGSET(tc, SYS_TCx, TLCS, CPU);
+ REGSET(tc, SYS_TCx, TM, IEE);
+ REGSET(tc, SYS_TCx, INTS, DIS);
+ REGSET(tc, SYS_TCx, UDS, UP);
+ REGSET(tc, SYS_TCx, TSZ, 32);
+ REGSET(tc, SYS_TCx, REN, EN);
+
+ __raw_writel(tc, SYS_TC(TIMER_CLOCKSOURCE));
+
+ ns9360_clocksource.mult = clocksource_hz2mult(ns9360_cpuclock(),
+ ns9360_clocksource.shift);
+
+ clocksource_register(&ns9360_clocksource);
+
+ latch = SH_DIV(ns9360_cpuclock(), HZ, 0);
+
+ tc = __raw_readl(SYS_TC(TIMER_CLOCKEVENT));
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ REGSET(tc, SYS_TCx, TDBG, STOP);
+ REGSET(tc, SYS_TCx, TLCS, CPU);
+ REGSET(tc, SYS_TCx, TM, IEE);
+ REGSET(tc, SYS_TCx, INTS, DIS);
+ REGSET(tc, SYS_TCx, UDS, DOWN);
+ REGSET(tc, SYS_TCx, TSZ, 32);
+ REGSET(tc, SYS_TCx, REN, EN);
+ __raw_writel(tc, SYS_TC(TIMER_CLOCKEVENT));
+
+ ns9360_clockevent_device.mult = div_sc(ns9360_cpuclock(),
+ NSEC_PER_SEC, ns9360_clockevent_device.shift);
+ ns9360_clockevent_device.max_delta_ns =
+ clockevent_delta2ns(-1, &ns9360_clockevent_device);
+ ns9360_clockevent_device.min_delta_ns =
+ clockevent_delta2ns(1, &ns9360_clockevent_device);
+
+ ns9360_clockevent_device.cpumask = cpumask_of_cpu(0);
+ clockevents_register_device(&ns9360_clockevent_device);
+
+ setup_irq(IRQ_NS9360_TIMER0 + TIMER_CLOCKEVENT,
+ &ns9360_clockevent_action);
+}
+
+struct sys_timer ns9360_timer = {
+ .init = ns9360_timer_init,
+};