zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mach-ux500/timer.c b/ap/os/linux/linux-3.4.x/arch/arm/mach-ux500/timer.c
new file mode 100644
index 0000000..d37df98
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/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,
+};