1 files changed, 92 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c
new file mode 100644
index 00000000..d37df98b
--- /dev/null
+++ b/arch/arm/mach-ux500/timer.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson
+ */
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/clksrc-dbx500-prcmu.h>
+#include <linux/of.h>
+
+#include <asm/smp_twd.h>
+
+#include <plat/mtu.h>
+
+#include <mach/setup.h>
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+
+#ifdef CONFIG_HAVE_ARM_TWD
+static DEFINE_TWD_LOCAL_TIMER(u5500_twd_local_timer,
+			      U5500_TWD_BASE, IRQ_LOCALTIMER);
+static DEFINE_TWD_LOCAL_TIMER(u8500_twd_local_timer,
+			      U8500_TWD_BASE, IRQ_LOCALTIMER);
+
+static void __init ux500_twd_init(void)
+{
+	struct twd_local_timer *twd_local_timer;
+	int err;
+
+	twd_local_timer = cpu_is_u5500() ? &u5500_twd_local_timer :
+					   &u8500_twd_local_timer;
+
+	if (of_have_populated_dt())
+		twd_local_timer_of_register();
+	else {
+		err = twd_local_timer_register(twd_local_timer);
+		if (err)
+			pr_err("twd_local_timer_register failed %d\n", err);
+	}
+}
+#else
+#define ux500_twd_init()	do { } while(0)
+#endif
+
+static void __init ux500_timer_init(void)
+{
+	void __iomem *mtu_timer_base;
+	void __iomem *prcmu_timer_base;
+
+	if (cpu_is_u5500()) {
+		mtu_timer_base = __io_address(U5500_MTU0_BASE);
+		prcmu_timer_base = __io_address(U5500_PRCMU_TIMER_3_BASE);
+	} else if (cpu_is_u8500()) {
+		mtu_timer_base = __io_address(U8500_MTU0_BASE);
+		prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE);
+	} else {
+		ux500_unknown_soc();
+	}
+
+	/*
+	 * Here we register the timerblocks active in the system.
+	 * Localtimers (twd) is started when both cpu is up and running.
+	 * MTU register a clocksource, clockevent and sched_clock.
+	 * Since the MTU is located in the VAPE power domain
+	 * it will be cleared in sleep which makes it unsuitable.
+	 * We however need it as a timer tick (clockevent)
+	 * during boot to calibrate delay until twd is started.
+	 * RTC-RTT have problems as timer tick during boot since it is
+	 * depending on delay which is not yet calibrated. RTC-RTT is in the
+	 * always-on powerdomain and is used as clockevent instead of twd when
+	 * sleeping.
+	 * The PRCMU timer 4(3 for DB5500) register a clocksource and
+	 * sched_clock with higher rating then MTU since is always-on.
+	 *
+	 */
+
+	nmdk_timer_init(mtu_timer_base);
+	clksrc_dbx500_prcmu_init(prcmu_timer_base);
+	ux500_twd_init();
+}
+
+static void ux500_timer_reset(void)
+{
+	nmdk_clkevt_reset();
+	nmdk_clksrc_reset();
+}
+
+struct sys_timer ux500_timer = {
+	.init		= ux500_timer_init,
+	.resume		= ux500_timer_reset,
+};