efDataPreprocessing connectTheSignalSlot.c 袁明明 commit at 2021-02-08

efDataPreprocessing/monitoringDataProcessing/connectTheSignalSlot.c

@@ -171,3 +171,168 @@ static int twd_cpufreq_transition(struct notifier_block *nb,
 
 	return NOTIFY_OK;
 }
+
+static struct notifier_block twd_cpufreq_nb = {
+	.notifier_call = twd_cpufreq_transition,
+};
+
+static int twd_cpufreq_init(void)
+{
+	if (twd_evt && *__this_cpu_ptr(twd_evt) && !IS_ERR(twd_clk))
+		return cpufreq_register_notifier(&twd_cpufreq_nb,
+			CPUFREQ_TRANSITION_NOTIFIER);
+
+	return 0;
+}
+core_initcall(twd_cpufreq_init);
+
+#endif
+
+static void __cpuinit twd_calibrate_rate(void)
+{
+	unsigned long count;
+	u64 waitjiffies;
+
+	/*
+	 * If this is the first time round, we need to work out how fast
+	 * the timer ticks
+	 */
+	if (twd_timer_rate == 0) {
+		printk(KERN_INFO "Calibrating local timer... ");
+
+		/* Wait for a tick to start */
+		waitjiffies = get_jiffies_64() + 1;
+
+		while (get_jiffies_64() < waitjiffies)
+			udelay(10);
+
+		/* OK, now the tick has started, let's get the timer going */
+		waitjiffies += 5;
+
+				 /* enable, no interrupt or reload */
+		__raw_writel(0x1, twd_base + TWD_TIMER_CONTROL);
+
+				 /* maximum value */
+		__raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);
+
+		while (get_jiffies_64() < waitjiffies)
+			udelay(10);
+
+		count = __raw_readl(twd_base + TWD_TIMER_COUNTER);
+
+		twd_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
+
+		printk("%lu.%02luMHz.\n", twd_timer_rate / 1000000,
+			(twd_timer_rate / 10000) % 100);
+	}
+}
+
+static irqreturn_t twd_handler(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = *(struct clock_event_device **)dev_id;
+
+	if (twd_timer_ack()) {
+		evt->event_handler(evt);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static struct clk *twd_get_clock(void)
+{
+	struct clk *clk;
+	int err;
+
+	clk = clk_get_sys("smp_twd", NULL);
+	if (IS_ERR(clk)) {
+		pr_err("smp_twd: clock not found: %d\n", (int)PTR_ERR(clk));
+		return clk;
+	}
+
+	err = clk_prepare_enable(clk);
+	if (err) {
+		pr_err("smp_twd: clock failed to prepare+enable: %d\n", err);
+		clk_put(clk);
+		return ERR_PTR(err);
+	}
+
+	return clk;
+}
+
+/*
+ * Setup the local clock events for a CPU.
+ */
+static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
+{
+	struct clock_event_device **this_cpu_clk;
+	int cpu = smp_processor_id();
+
+	/*
+	 * If the basic setup for this CPU has been done before don't
+	 * bother with the below.
+	 */
+	if (per_cpu(percpu_setup_called, cpu)) {
+		__raw_writel(0, twd_base + TWD_TIMER_CONTROL);
+		clockevents_register_device(*__this_cpu_ptr(twd_evt));
+		enable_percpu_irq(clk->irq, 0);
+		return 0;
+	}
+	per_cpu(percpu_setup_called, cpu) = true;
+
+	/*
+	 * This stuff only need to be done once for the entire TWD cluster
+	 * during the runtime of the system.
+	 */
+	if (!common_setup_called) {
+		twd_clk = twd_get_clock();
+
+		/*
+		 * We use IS_ERR_OR_NULL() here, because if the clock stubs
+		 * are active we will get a valid clk reference which is
+		 * however NULL and will return the rate 0. In that case we
+		 * need to calibrate the rate instead.
+		 */
+		if (!IS_ERR_OR_NULL(twd_clk))
+			twd_timer_rate = clk_get_rate(twd_clk);
+		else
+			twd_calibrate_rate();
+
+		common_setup_called = true;
+	}
+
+	/*
+	 * The following is done once per CPU the first time .setup() is
+	 * called.
+	 */
+	__raw_writel(0, twd_base + TWD_TIMER_CONTROL);
+
+	clk->name = "local_timer";
+	clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
+			CLOCK_EVT_FEAT_C3STOP;
+	clk->rating = 350;
+	clk->set_mode = twd_set_mode;
+	clk->set_next_event = twd_set_next_event;
+	clk->irq = twd_ppi;
+
+	this_cpu_clk = __this_cpu_ptr(twd_evt);
+	*this_cpu_clk = clk;
+
+	clockevents_config_and_register(clk, twd_timer_rate,
+					0xf, 0xffffffff);
+	enable_percpu_irq(clk->irq, 0);
+
+	return 0;
+}
+
+static struct local_timer_ops twd_lt_ops __cpuinitdata = {
+	.setup	= twd_timer_setup,
+	.stop	= twd_timer_stop,
+};
+
+static int __init twd_local_timer_common_register(void)
+{
+	int err;
+
+	twd_evt = alloc_percpu(struct clock_event_device *);
+	if (!twd_evt) {