zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mach-mmp/time.c b/ap/os/linux/linux-3.4.x/arch/arm/mach-mmp/time.c
new file mode 100644
index 0000000..71fc4ee
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/mach-mmp/time.c
@@ -0,0 +1,205 @@
+/*
+ * linux/arch/arm/mach-mmp/time.c
+ *
+ * Support for clocksource and clockevents
+ *
+ * Copyright (C) 2008 Marvell International Ltd.
+ * All rights reserved.
+ *
+ * 2008-04-11: Jason Chagas <Jason.chagas@marvell.com>
+ * 2008-10-08: Bin Yang <bin.yang@marvell.com>
+ *
+ * The timers module actually includes three timers, each timer with up to
+ * three match comparators. Timer #0 is used here in free-running mode as
+ * the clock source, and match comparator #1 used as clock event device.
+ *
+ * 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/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/clockchips.h>
+
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include <asm/sched_clock.h>
+#include <mach/addr-map.h>
+#include <mach/regs-timers.h>
+#include <mach/regs-apbc.h>
+#include <mach/irqs.h>
+#include <mach/cputype.h>
+#include <asm/mach/time.h>
+
+#include "clock.h"
+
+#define TIMERS_VIRT_BASE TIMERS1_VIRT_BASE
+
+#define MAX_DELTA (0xfffffffe)
+#define MIN_DELTA (16)
+
+/*
+ * FIXME: the timer needs some delay to stablize the counter capture
+ */
+static inline uint32_t timer_read(void)
+{
+ int delay = 100;
+
+ __raw_writel(1, TIMERS_VIRT_BASE + TMR_CVWR(1));
+
+ while (delay--)
+ cpu_relax();
+
+ return __raw_readl(TIMERS_VIRT_BASE + TMR_CVWR(1));
+}
+
+static u32 notrace mmp_read_sched_clock(void)
+{
+ return timer_read();
+}
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *c = dev_id;
+
+ /*
+ * Clear pending interrupt status.
+ */
+ __raw_writel(0x01, TIMERS_VIRT_BASE + TMR_ICR(0));
+
+ /*
+ * Disable timer 0.
+ */
+ __raw_writel(0x02, TIMERS_VIRT_BASE + TMR_CER);
+
+ c->event_handler(c);
+
+ return IRQ_HANDLED;
+}
+
+static int timer_set_next_event(unsigned long delta,
+ struct clock_event_device *dev)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ /*
+ * Disable timer 0.
+ */
+ __raw_writel(0x02, TIMERS_VIRT_BASE + TMR_CER);
+
+ /*
+ * Clear and enable timer match 0 interrupt.
+ */
+ __raw_writel(0x01, TIMERS_VIRT_BASE + TMR_ICR(0));
+ __raw_writel(0x01, TIMERS_VIRT_BASE + TMR_IER(0));
+
+ /*
+ * Setup new clockevent timer value.
+ */
+ __raw_writel(delta - 1, TIMERS_VIRT_BASE + TMR_TN_MM(0, 0));
+
+ /*
+ * Enable timer 0.
+ */
+ __raw_writel(0x03, TIMERS_VIRT_BASE + TMR_CER);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+static void timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *dev)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ switch (mode) {
+ case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ /* disable the matching interrupt */
+ __raw_writel(0x00, TIMERS_VIRT_BASE + TMR_IER(0));
+ break;
+ case CLOCK_EVT_MODE_RESUME:
+ case CLOCK_EVT_MODE_PERIODIC:
+ break;
+ }
+ local_irq_restore(flags);
+}
+
+static struct clock_event_device ckevt = {
+ .name = "clockevent",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .shift = 32,
+ .rating = 200,
+ .set_next_event = timer_set_next_event,
+ .set_mode = timer_set_mode,
+};
+
+static cycle_t clksrc_read(struct clocksource *cs)
+{
+ return timer_read();
+}
+
+static struct clocksource cksrc = {
+ .name = "clocksource",
+ .rating = 200,
+ .read = clksrc_read,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static void __init timer_config(void)
+{
+ uint32_t ccr = __raw_readl(TIMERS_VIRT_BASE + TMR_CCR);
+
+ __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_CER); /* disable */
+
+ ccr &= (cpu_is_mmp2()) ? (TMR_CCR_CS_0(0) | TMR_CCR_CS_1(0)) :
+ (TMR_CCR_CS_0(3) | TMR_CCR_CS_1(3));
+ __raw_writel(ccr, TIMERS_VIRT_BASE + TMR_CCR);
+
+ /* set timer 0 to periodic mode, and timer 1 to free-running mode */
+ __raw_writel(0x2, TIMERS_VIRT_BASE + TMR_CMR);
+
+ __raw_writel(0x1, TIMERS_VIRT_BASE + TMR_PLCR(0)); /* periodic */
+ __raw_writel(0x7, TIMERS_VIRT_BASE + TMR_ICR(0)); /* clear status */
+ __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_IER(0));
+
+ __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_PLCR(1)); /* free-running */
+ __raw_writel(0x7, TIMERS_VIRT_BASE + TMR_ICR(1)); /* clear status */
+ __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_IER(1));
+
+ /* enable timer 1 counter */
+ __raw_writel(0x2, TIMERS_VIRT_BASE + TMR_CER);
+}
+
+static struct irqaction timer_irq = {
+ .name = "timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = timer_interrupt,
+ .dev_id = &ckevt,
+};
+
+void __init timer_init(int irq)
+{
+ timer_config();
+
+ setup_sched_clock(mmp_read_sched_clock, 32, CLOCK_TICK_RATE);
+
+ ckevt.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, ckevt.shift);
+ ckevt.max_delta_ns = clockevent_delta2ns(MAX_DELTA, &ckevt);
+ ckevt.min_delta_ns = clockevent_delta2ns(MIN_DELTA, &ckevt);
+ ckevt.cpumask = cpumask_of(0);
+
+ setup_irq(irq, &timer_irq);
+
+ clocksource_register_hz(&cksrc, CLOCK_TICK_RATE);
+ clockevents_register_device(&ckevt);
+}