zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mach-msm/timer.c b/ap/os/linux/linux-3.4.x/arch/arm/mach-msm/timer.c
new file mode 100644
index 0000000..8128082
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/mach-msm/timer.c
@@ -0,0 +1,247 @@
+/*
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/mach/time.h>
+#include <asm/hardware/gic.h>
+#include <asm/localtimer.h>
+#include <asm/sched_clock.h>
+
+#include <mach/msm_iomap.h>
+#include <mach/cpu.h>
+#include <mach/board.h>
+
+#define TIMER_MATCH_VAL 0x0000
+#define TIMER_COUNT_VAL 0x0004
+#define TIMER_ENABLE 0x0008
+#define TIMER_ENABLE_CLR_ON_MATCH_EN BIT(1)
+#define TIMER_ENABLE_EN BIT(0)
+#define TIMER_CLEAR 0x000C
+#define DGT_CLK_CTL 0x0034
+#define DGT_CLK_CTL_DIV_4 0x3
+
+#define GPT_HZ 32768
+
+#define MSM_DGT_SHIFT 5
+
+static void __iomem *event_base;
+
+static irqreturn_t msm_timer_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = *(struct clock_event_device **)dev_id;
+ /* Stop the timer tick */
+ if (evt->mode == CLOCK_EVT_MODE_ONESHOT) {
+ u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE);
+ ctrl &= ~TIMER_ENABLE_EN;
+ writel_relaxed(ctrl, event_base + TIMER_ENABLE);
+ }
+ evt->event_handler(evt);
+ return IRQ_HANDLED;
+}
+
+static int msm_timer_set_next_event(unsigned long cycles,
+ struct clock_event_device *evt)
+{
+ u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE);
+
+ writel_relaxed(0, event_base + TIMER_CLEAR);
+ writel_relaxed(cycles, event_base + TIMER_MATCH_VAL);
+ writel_relaxed(ctrl | TIMER_ENABLE_EN, event_base + TIMER_ENABLE);
+ return 0;
+}
+
+static void msm_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ u32 ctrl;
+
+ ctrl = readl_relaxed(event_base + TIMER_ENABLE);
+ ctrl &= ~(TIMER_ENABLE_EN | TIMER_ENABLE_CLR_ON_MATCH_EN);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_RESUME:
+ case CLOCK_EVT_MODE_PERIODIC:
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ /* Timer is enabled in set_next_event */
+ break;
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ break;
+ }
+ writel_relaxed(ctrl, event_base + TIMER_ENABLE);
+}
+
+static struct clock_event_device msm_clockevent = {
+ .name = "gp_timer",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 200,
+ .set_next_event = msm_timer_set_next_event,
+ .set_mode = msm_timer_set_mode,
+};
+
+static union {
+ struct clock_event_device *evt;
+ struct clock_event_device __percpu **percpu_evt;
+} msm_evt;
+
+static void __iomem *source_base;
+
+static notrace cycle_t msm_read_timer_count(struct clocksource *cs)
+{
+ return readl_relaxed(source_base + TIMER_COUNT_VAL);
+}
+
+static notrace cycle_t msm_read_timer_count_shift(struct clocksource *cs)
+{
+ /*
+ * Shift timer count down by a constant due to unreliable lower bits
+ * on some targets.
+ */
+ return msm_read_timer_count(cs) >> MSM_DGT_SHIFT;
+}
+
+static struct clocksource msm_clocksource = {
+ .name = "dg_timer",
+ .rating = 300,
+ .read = msm_read_timer_count,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+#ifdef CONFIG_LOCAL_TIMERS
+static int __cpuinit msm_local_timer_setup(struct clock_event_device *evt)
+{
+ /* Use existing clock_event for cpu 0 */
+ if (!smp_processor_id())
+ return 0;
+
+ writel_relaxed(0, event_base + TIMER_ENABLE);
+ writel_relaxed(0, event_base + TIMER_CLEAR);
+ writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
+ evt->irq = msm_clockevent.irq;
+ evt->name = "local_timer";
+ evt->features = msm_clockevent.features;
+ evt->rating = msm_clockevent.rating;
+ evt->set_mode = msm_timer_set_mode;
+ evt->set_next_event = msm_timer_set_next_event;
+ evt->shift = msm_clockevent.shift;
+ evt->mult = div_sc(GPT_HZ, NSEC_PER_SEC, evt->shift);
+ evt->max_delta_ns = clockevent_delta2ns(0xf0000000, evt);
+ evt->min_delta_ns = clockevent_delta2ns(4, evt);
+
+ *__this_cpu_ptr(msm_evt.percpu_evt) = evt;
+ clockevents_register_device(evt);
+ enable_percpu_irq(evt->irq, 0);
+ return 0;
+}
+
+static void msm_local_timer_stop(struct clock_event_device *evt)
+{
+ evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
+ disable_percpu_irq(evt->irq);
+}
+
+static struct local_timer_ops msm_local_timer_ops __cpuinitdata = {
+ .setup = msm_local_timer_setup,
+ .stop = msm_local_timer_stop,
+};
+#endif /* CONFIG_LOCAL_TIMERS */
+
+static notrace u32 msm_sched_clock_read(void)
+{
+ return msm_clocksource.read(&msm_clocksource);
+}
+
+static void __init msm_timer_init(void)
+{
+ struct clock_event_device *ce = &msm_clockevent;
+ struct clocksource *cs = &msm_clocksource;
+ int res;
+ u32 dgt_hz;
+
+ if (cpu_is_msm7x01()) {
+ event_base = MSM_CSR_BASE;
+ source_base = MSM_CSR_BASE + 0x10;
+ dgt_hz = 19200000 >> MSM_DGT_SHIFT; /* 600 KHz */
+ cs->read = msm_read_timer_count_shift;
+ cs->mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT));
+ } else if (cpu_is_msm7x30()) {
+ event_base = MSM_CSR_BASE + 0x04;
+ source_base = MSM_CSR_BASE + 0x24;
+ dgt_hz = 24576000 / 4;
+ } else if (cpu_is_qsd8x50()) {
+ event_base = MSM_CSR_BASE;
+ source_base = MSM_CSR_BASE + 0x10;
+ dgt_hz = 19200000 / 4;
+ } else if (cpu_is_msm8x60() || cpu_is_msm8960()) {
+ event_base = MSM_TMR_BASE + 0x04;
+ /* Use CPU0's timer as the global clock source. */
+ source_base = MSM_TMR0_BASE + 0x24;
+ dgt_hz = 27000000 / 4;
+ writel_relaxed(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
+ } else
+ BUG();
+
+ writel_relaxed(0, event_base + TIMER_ENABLE);
+ writel_relaxed(0, event_base + TIMER_CLEAR);
+ writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
+ ce->cpumask = cpumask_of(0);
+
+ ce->irq = INT_GP_TIMER_EXP;
+ clockevents_config_and_register(ce, GPT_HZ, 4, 0xffffffff);
+ if (cpu_is_msm8x60() || cpu_is_msm8960()) {
+ msm_evt.percpu_evt = alloc_percpu(struct clock_event_device *);
+ if (!msm_evt.percpu_evt) {
+ pr_err("memory allocation failed for %s\n", ce->name);
+ goto err;
+ }
+ *__this_cpu_ptr(msm_evt.percpu_evt) = ce;
+ res = request_percpu_irq(ce->irq, msm_timer_interrupt,
+ ce->name, msm_evt.percpu_evt);
+ if (!res) {
+ enable_percpu_irq(ce->irq, 0);
+#ifdef CONFIG_LOCAL_TIMERS
+ local_timer_register(&msm_local_timer_ops);
+#endif
+ }
+ } else {
+ msm_evt.evt = ce;
+ res = request_irq(ce->irq, msm_timer_interrupt,
+ IRQF_TIMER | IRQF_NOBALANCING |
+ IRQF_TRIGGER_RISING, ce->name, &msm_evt.evt);
+ }
+
+ if (res)
+ pr_err("request_irq failed for %s\n", ce->name);
+err:
+ writel_relaxed(TIMER_ENABLE_EN, source_base + TIMER_ENABLE);
+ res = clocksource_register_hz(cs, dgt_hz);
+ if (res)
+ pr_err("clocksource_register failed\n");
+ setup_sched_clock(msm_sched_clock_read,
+ cpu_is_msm7x01() ? 32 - MSM_DGT_SHIFT : 32, dgt_hz);
+}
+
+struct sys_timer msm_timer = {
+ .init = msm_timer_init
+};