1 files changed, 164 insertions, 0 deletions
diff --git a/arch/arm/mach-nomadik/timer.c b/arch/arm/mach-nomadik/timer.c
new file mode 100644
index 0000000..d1738e7
--- /dev/null
+++ b/arch/arm/mach-nomadik/timer.c
@@ -0,0 +1,164 @@
+/*
+ *  linux/arch/arm/mach-nomadik/timer.c
+ *
+ * Copyright (C) 2008 STMicroelectronics
+ * Copyright (C) 2009 Alessandro Rubini, somewhat based on at91sam926x
+ *
+ * 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/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/clockchips.h>
+#include <linux/jiffies.h>
+#include <asm/mach/time.h>
+#include <mach/mtu.h>
+
+#define TIMER_CTRL	0x80	/* No divisor */
+#define TIMER_PERIODIC	0x40
+#define TIMER_SZ32BIT	0x02
+
+/* Initial value for SRC control register: all timers use MXTAL/8 source */
+#define SRC_CR_INIT_MASK	0x00007fff
+#define SRC_CR_INIT_VAL		0x2aaa8000
+
+static u32	nmdk_count;		/* accumulated count */
+static u32	nmdk_cycle;		/* write-once */
+static __iomem void *mtu_base;
+
+/*
+ * clocksource: the MTU device is a decrementing counters, so we negate
+ * the value being read.
+ */
+static cycle_t nmdk_read_timer(struct clocksource *cs)
+{
+	u32 count = readl(mtu_base + MTU_VAL(0));
+	return nmdk_count + nmdk_cycle - count;
+
+}
+
+static struct clocksource nmdk_clksrc = {
+	.name		= "mtu_0",
+	.rating		= 120,
+	.read		= nmdk_read_timer,
+	.shift		= 20,
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+/*
+ * Clockevent device: currently only periodic mode is supported
+ */
+static void nmdk_clkevt_mode(enum clock_event_mode mode,
+			     struct clock_event_device *dev)
+{
+	unsigned long flags;
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		/* enable interrupts -- and count current value? */
+		raw_local_irq_save(flags);
+		writel(readl(mtu_base + MTU_IMSC) | 1, mtu_base + MTU_IMSC);
+		raw_local_irq_restore(flags);
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+		BUG(); /* Not supported, yet */
+		/* FALLTHROUGH */
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_UNUSED:
+		/* disable irq */
+		raw_local_irq_save(flags);
+		writel(readl(mtu_base + MTU_IMSC) & ~1, mtu_base + MTU_IMSC);
+		raw_local_irq_restore(flags);
+		break;
+	case CLOCK_EVT_MODE_RESUME:
+		break;
+	}
+}
+
+static struct clock_event_device nmdk_clkevt = {
+	.name		= "mtu_0",
+	.features	= CLOCK_EVT_FEAT_PERIODIC,
+	.shift		= 32,
+	.rating		= 100,
+	.set_mode	= nmdk_clkevt_mode,
+};
+
+/*
+ * IRQ Handler for the timer 0 of the MTU block. The irq is not shared
+ * as we are the only users of mtu0 by now.
+ */
+static irqreturn_t nmdk_timer_interrupt(int irq, void *dev_id)
+{
+	/* ack: "interrupt clear register" */
+	writel( 1 << 0, mtu_base + MTU_ICR);
+
+	/* we can't count lost ticks, unfortunately */
+	nmdk_count += nmdk_cycle;
+	nmdk_clkevt.event_handler(&nmdk_clkevt);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+static struct irqaction nmdk_timer_irq = {
+	.name		= "Nomadik Timer Tick",
+	.flags		= IRQF_DISABLED | IRQF_TIMER,
+	.handler	= nmdk_timer_interrupt,
+};
+
+static void nmdk_timer_reset(void)
+{
+	u32 cr;
+
+	writel(0, mtu_base + MTU_CR(0)); /* off */
+
+	/* configure load and background-load, and fire it up */
+	writel(nmdk_cycle, mtu_base + MTU_LR(0));
+	writel(nmdk_cycle, mtu_base + MTU_BGLR(0));
+	cr = MTU_CRn_PERIODIC | MTU_CRn_PRESCALE_1 | MTU_CRn_32BITS;
+	writel(cr, mtu_base + MTU_CR(0));
+	writel(cr | MTU_CRn_ENA, mtu_base + MTU_CR(0));
+}
+
+static void __init nmdk_timer_init(void)
+{
+	u32 src_cr;
+	unsigned long rate;
+	int bits;
+
+	rate = CLOCK_TICK_RATE; /* 2.4MHz */
+	nmdk_cycle = (rate + HZ/2) / HZ;
+
+	/* Configure timer sources in "system reset controller" ctrl reg */
+	src_cr = readl(io_p2v(NOMADIK_SRC_BASE));
+	src_cr &= SRC_CR_INIT_MASK;
+	src_cr |= SRC_CR_INIT_VAL;
+	writel(src_cr, io_p2v(NOMADIK_SRC_BASE));
+
+	/* Save global pointer to mtu, used by functions above */
+	mtu_base = io_p2v(NOMADIK_MTU0_BASE);
+
+	/* Init the timer and register clocksource */
+	nmdk_timer_reset();
+
+	nmdk_clksrc.mult = clocksource_hz2mult(rate, nmdk_clksrc.shift);
+	bits =  8*sizeof(nmdk_count);
+	nmdk_clksrc.mask = CLOCKSOURCE_MASK(bits);
+
+	clocksource_register(&nmdk_clksrc);
+
+	/* Register irq and clockevents */
+	setup_irq(IRQ_MTU0, &nmdk_timer_irq);
+	nmdk_clkevt.mult = div_sc(rate, NSEC_PER_SEC, nmdk_clkevt.shift);
+	nmdk_clkevt.cpumask = cpumask_of(0);
+	clockevents_register_device(&nmdk_clkevt);
+}
+
+struct sys_timer nomadik_timer = {
+	.init		= nmdk_timer_init,
+};