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@@ -1,421 +0,0 @@
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-From 5afd20a1eeef4db1d694d58931519f65e2003503 Mon Sep 17 00:00:00 2001
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-From: Stuart Menefy <[email protected]>
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-Date: Wed, 26 Jun 2013 12:48:38 +0100
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-Subject: [PATCH 01/18] clocksource: arm_global_timer: Add ARM global timer
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- support
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-
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-This is a simple driver for the global timer module found in the Cortex
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-A9-MP cores from revision r1p0 onwards. This should be able to perform
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-the functions of the system timer and the local timer in an SMP system.
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-
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-The global timer has the following features:
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- The global timer is a 64-bit incrementing counter with an
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-auto-incrementing feature. It continues incrementing after sending
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-interrupts. The global timer is memory mapped in the private memory
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-region.
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- The global timer is accessible to all Cortex-A9 processors in the
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-cluster. Each Cortex-A9 processor has a private 64-bit comparator that
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-is used to assert a private interrupt when the global timer has reached
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-the comparator value. All the Cortex-A9 processors in a design use the
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-banked ID, ID27, for this interrupt. ID27 is sent to the Interrupt
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-Controller as a Private Peripheral Interrupt. The global timer is
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-clocked by PERIPHCLK.
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-
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-Signed-off-by: Stuart Menefy <[email protected]>
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-Signed-off-by: Srinivas Kandagatla <[email protected]>
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-CC: Arnd Bergmann <[email protected]>
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-CC: Rob Herring <[email protected]>
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-CC: Linus Walleij <[email protected]>
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-CC: Will Deacon <[email protected]>
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-CC: Thomas Gleixner <[email protected]>
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-Signed-off-by: Daniel Lezcano <[email protected]>
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----
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- .../devicetree/bindings/arm/global_timer.txt | 24 ++
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- drivers/clocksource/Kconfig | 13 +
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- drivers/clocksource/Makefile | 1 +
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- drivers/clocksource/arm_global_timer.c | 321 ++++++++++++++++++++
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- 4 files changed, 359 insertions(+)
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- create mode 100644 Documentation/devicetree/bindings/arm/global_timer.txt
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- create mode 100644 drivers/clocksource/arm_global_timer.c
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-
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---- /dev/null
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-+++ b/Documentation/devicetree/bindings/arm/global_timer.txt
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-@@ -0,0 +1,24 @@
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-+
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-+* ARM Global Timer
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-+ Cortex-A9 are often associated with a per-core Global timer.
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-+
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-+** Timer node required properties:
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-+
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-+- compatible : Should be "arm,cortex-a9-global-timer"
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-+ Driver supports versions r2p0 and above.
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-+
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-+- interrupts : One interrupt to each core
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-+
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-+- reg : Specify the base address and the size of the GT timer
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-+ register window.
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-+
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-+- clocks : Should be phandle to a clock.
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-+
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-+Example:
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-+
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-+ timer@2c000600 {
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-+ compatible = "arm,cortex-a9-global-timer";
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-+ reg = <0x2c000600 0x20>;
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-+ interrupts = <1 13 0xf01>;
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-+ clocks = <&arm_periph_clk>;
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-+ };
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---- a/drivers/clocksource/Kconfig
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-+++ b/drivers/clocksource/Kconfig
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-@@ -67,6 +67,19 @@ config ARM_ARCH_TIMER
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- bool
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- select CLKSRC_OF if OF
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-
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-+config ARM_GLOBAL_TIMER
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-+ bool
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-+ select CLKSRC_OF if OF
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-+ help
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-+ This options enables support for the ARM global timer unit
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-+
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-+config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
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-+ bool
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-+ depends on ARM_GLOBAL_TIMER
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-+ default y
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-+ help
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-+ Use ARM global timer clock source as sched_clock
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-+
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- config CLKSRC_METAG_GENERIC
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- def_bool y if METAG
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- help
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---- a/drivers/clocksource/Makefile
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-+++ b/drivers/clocksource/Makefile
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-@@ -28,4 +28,5 @@ obj-$(CONFIG_CLKSRC_EXYNOS_MCT) += exyno
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- obj-$(CONFIG_CLKSRC_SAMSUNG_PWM) += samsung_pwm_timer.o
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-
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- obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
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-+obj-$(CONFIG_ARM_GLOBAL_TIMER) += arm_global_timer.o
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- obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
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---- /dev/null
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-+++ b/drivers/clocksource/arm_global_timer.c
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-@@ -0,0 +1,321 @@
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-+/*
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-+ * drivers/clocksource/arm_global_timer.c
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-+ *
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-+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
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-+ * Author: Stuart Menefy <[email protected]>
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-+ * Author: Srinivas Kandagatla <[email protected]>
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-+ *
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-+ * This program is free software; you can redistribute it and/or modify
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-+ * it under the terms of the GNU General Public License version 2 as
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-+ * published by the Free Software Foundation.
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-+ */
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-+
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-+#include <linux/init.h>
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-+#include <linux/interrupt.h>
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-+#include <linux/clocksource.h>
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-+#include <linux/clockchips.h>
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-+#include <linux/cpu.h>
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-+#include <linux/clk.h>
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-+#include <linux/err.h>
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-+#include <linux/io.h>
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-+#include <linux/of.h>
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-+#include <linux/of_irq.h>
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-+#include <linux/of_address.h>
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-+#include <asm/sched_clock.h>
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-+
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-+#include <asm/cputype.h>
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-+
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-+#define GT_COUNTER0 0x00
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-+#define GT_COUNTER1 0x04
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-+
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-+#define GT_CONTROL 0x08
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-+#define GT_CONTROL_TIMER_ENABLE BIT(0) /* this bit is NOT banked */
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-+#define GT_CONTROL_COMP_ENABLE BIT(1) /* banked */
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-+#define GT_CONTROL_IRQ_ENABLE BIT(2) /* banked */
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-+#define GT_CONTROL_AUTO_INC BIT(3) /* banked */
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-+
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-+#define GT_INT_STATUS 0x0c
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-+#define GT_INT_STATUS_EVENT_FLAG BIT(0)
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-+
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-+#define GT_COMP0 0x10
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-+#define GT_COMP1 0x14
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-+#define GT_AUTO_INC 0x18
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-+
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-+/*
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-+ * We are expecting to be clocked by the ARM peripheral clock.
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-+ *
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-+ * Note: it is assumed we are using a prescaler value of zero, so this is
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-+ * the units for all operations.
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-+ */
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-+static void __iomem *gt_base;
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-+static unsigned long gt_clk_rate;
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-+static int gt_ppi;
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-+static struct clock_event_device __percpu *gt_evt;
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-+
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-+/*
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-+ * To get the value from the Global Timer Counter register proceed as follows:
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-+ * 1. Read the upper 32-bit timer counter register
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-+ * 2. Read the lower 32-bit timer counter register
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-+ * 3. Read the upper 32-bit timer counter register again. If the value is
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-+ * different to the 32-bit upper value read previously, go back to step 2.
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-+ * Otherwise the 64-bit timer counter value is correct.
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-+ */
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-+static u64 gt_counter_read(void)
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-+{
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-+ u64 counter;
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-+ u32 lower;
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-+ u32 upper, old_upper;
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-+
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-+ upper = readl_relaxed(gt_base + GT_COUNTER1);
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-+ do {
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-+ old_upper = upper;
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-+ lower = readl_relaxed(gt_base + GT_COUNTER0);
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-+ upper = readl_relaxed(gt_base + GT_COUNTER1);
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-+ } while (upper != old_upper);
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-+
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-+ counter = upper;
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-+ counter <<= 32;
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-+ counter |= lower;
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-+ return counter;
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-+}
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-+
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-+/**
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-+ * To ensure that updates to comparator value register do not set the
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-+ * Interrupt Status Register proceed as follows:
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-+ * 1. Clear the Comp Enable bit in the Timer Control Register.
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-+ * 2. Write the lower 32-bit Comparator Value Register.
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-+ * 3. Write the upper 32-bit Comparator Value Register.
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-+ * 4. Set the Comp Enable bit and, if necessary, the IRQ enable bit.
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-+ */
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-+static void gt_compare_set(unsigned long delta, int periodic)
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-+{
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-+ u64 counter = gt_counter_read();
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-+ unsigned long ctrl;
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-+
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-+ counter += delta;
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-+ ctrl = GT_CONTROL_TIMER_ENABLE;
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-+ writel(ctrl, gt_base + GT_CONTROL);
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-+ writel(lower_32_bits(counter), gt_base + GT_COMP0);
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-+ writel(upper_32_bits(counter), gt_base + GT_COMP1);
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-+
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-+ if (periodic) {
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-+ writel(delta, gt_base + GT_AUTO_INC);
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-+ ctrl |= GT_CONTROL_AUTO_INC;
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-+ }
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-+
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-+ ctrl |= GT_CONTROL_COMP_ENABLE | GT_CONTROL_IRQ_ENABLE;
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-+ writel(ctrl, gt_base + GT_CONTROL);
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-+}
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-+
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-+static void gt_clockevent_set_mode(enum clock_event_mode mode,
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-+ struct clock_event_device *clk)
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-+{
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-+ unsigned long ctrl;
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-+
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-+ switch (mode) {
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-+ case CLOCK_EVT_MODE_PERIODIC:
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-+ gt_compare_set(DIV_ROUND_CLOSEST(gt_clk_rate, HZ), 1);
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-+ break;
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-+ case CLOCK_EVT_MODE_ONESHOT:
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-+ case CLOCK_EVT_MODE_UNUSED:
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-+ case CLOCK_EVT_MODE_SHUTDOWN:
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-+ ctrl = readl(gt_base + GT_CONTROL);
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-+ ctrl &= ~(GT_CONTROL_COMP_ENABLE |
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-+ GT_CONTROL_IRQ_ENABLE | GT_CONTROL_AUTO_INC);
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-+ writel(ctrl, gt_base + GT_CONTROL);
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-+ break;
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-+ default:
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-+ break;
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-+ }
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-+}
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-+
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-+static int gt_clockevent_set_next_event(unsigned long evt,
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-+ struct clock_event_device *unused)
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-+{
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-+ gt_compare_set(evt, 0);
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-+ return 0;
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-+}
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-+
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-+static irqreturn_t gt_clockevent_interrupt(int irq, void *dev_id)
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-+{
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-+ struct clock_event_device *evt = dev_id;
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-+
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-+ if (!(readl_relaxed(gt_base + GT_INT_STATUS) &
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-+ GT_INT_STATUS_EVENT_FLAG))
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-+ return IRQ_NONE;
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-+
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-+ /**
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-+ * ERRATA 740657( Global Timer can send 2 interrupts for
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-+ * the same event in single-shot mode)
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-+ * Workaround:
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-+ * Either disable single-shot mode.
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-+ * Or
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-+ * Modify the Interrupt Handler to avoid the
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-+ * offending sequence. This is achieved by clearing
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-+ * the Global Timer flag _after_ having incremented
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-+ * the Comparator register value to a higher value.
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-+ */
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-+ if (evt->mode == CLOCK_EVT_MODE_ONESHOT)
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-+ gt_compare_set(ULONG_MAX, 0);
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-+
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-+ writel_relaxed(GT_INT_STATUS_EVENT_FLAG, gt_base + GT_INT_STATUS);
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-+ evt->event_handler(evt);
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-+
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-+ return IRQ_HANDLED;
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-+}
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-+
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-+static int __cpuinit gt_clockevents_init(struct clock_event_device *clk)
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-+{
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-+ int cpu = smp_processor_id();
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-+
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-+ clk->name = "arm_global_timer";
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-+ clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
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-+ clk->set_mode = gt_clockevent_set_mode;
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-+ clk->set_next_event = gt_clockevent_set_next_event;
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-+ clk->cpumask = cpumask_of(cpu);
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-+ clk->rating = 300;
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-+ clk->irq = gt_ppi;
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-+ clockevents_config_and_register(clk, gt_clk_rate,
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-+ 1, 0xffffffff);
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-+ enable_percpu_irq(clk->irq, IRQ_TYPE_NONE);
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-+ return 0;
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-+}
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-+
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-+static void gt_clockevents_stop(struct clock_event_device *clk)
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-+{
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-+ gt_clockevent_set_mode(CLOCK_EVT_MODE_UNUSED, clk);
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-+ disable_percpu_irq(clk->irq);
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-+}
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-+
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-+static cycle_t gt_clocksource_read(struct clocksource *cs)
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-+{
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-+ return gt_counter_read();
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-+}
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-+
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-+static struct clocksource gt_clocksource = {
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-+ .name = "arm_global_timer",
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|
-+ .rating = 300,
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|
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-+ .read = gt_clocksource_read,
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|
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-+ .mask = CLOCKSOURCE_MASK(64),
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|
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-+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
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|
-+};
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-+
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-+#ifdef CONFIG_CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
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|
-+static u32 notrace gt_sched_clock_read(void)
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-+{
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|
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|
-+ return gt_counter_read();
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-+}
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|
|
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|
-+#endif
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|
|
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|
-+
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|
-+static void __init gt_clocksource_init(void)
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|
|
|
-+{
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|
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-+ writel(0, gt_base + GT_CONTROL);
|
|
|
|
|
-+ writel(0, gt_base + GT_COUNTER0);
|
|
|
|
|
-+ writel(0, gt_base + GT_COUNTER1);
|
|
|
|
|
-+ /* enables timer on all the cores */
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|
|
|
|
-+ writel(GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL);
|
|
|
|
|
-+
|
|
|
|
|
-+#ifdef CONFIG_CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
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|
|
|
-+ setup_sched_clock(gt_sched_clock_read, 32, gt_clk_rate);
|
|
|
|
|
-+#endif
|
|
|
|
|
-+ clocksource_register_hz(>_clocksource, gt_clk_rate);
|
|
|
|
|
-+}
|
|
|
|
|
-+
|
|
|
|
|
-+static int __cpuinit gt_cpu_notify(struct notifier_block *self,
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|
|
|
|
-+ unsigned long action, void *hcpu)
|
|
|
|
|
-+{
|
|
|
|
|
-+ switch (action & ~CPU_TASKS_FROZEN) {
|
|
|
|
|
-+ case CPU_STARTING:
|
|
|
|
|
-+ gt_clockevents_init(this_cpu_ptr(gt_evt));
|
|
|
|
|
-+ break;
|
|
|
|
|
-+ case CPU_DYING:
|
|
|
|
|
-+ gt_clockevents_stop(this_cpu_ptr(gt_evt));
|
|
|
|
|
-+ break;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ return NOTIFY_OK;
|
|
|
|
|
-+}
|
|
|
|
|
-+static struct notifier_block gt_cpu_nb __cpuinitdata = {
|
|
|
|
|
-+ .notifier_call = gt_cpu_notify,
|
|
|
|
|
-+};
|
|
|
|
|
-+
|
|
|
|
|
-+static void __init global_timer_of_register(struct device_node *np)
|
|
|
|
|
-+{
|
|
|
|
|
-+ struct clk *gt_clk;
|
|
|
|
|
-+ int err = 0;
|
|
|
|
|
-+
|
|
|
|
|
-+ /*
|
|
|
|
|
-+ * In r2p0 the comparators for each processor with the global timer
|
|
|
|
|
-+ * fire when the timer value is greater than or equal to. In previous
|
|
|
|
|
-+ * revisions the comparators fired when the timer value was equal to.
|
|
|
|
|
-+ */
|
|
|
|
|
-+ if ((read_cpuid_id() & 0xf0000f) < 0x200000) {
|
|
|
|
|
-+ pr_warn("global-timer: non support for this cpu version.\n");
|
|
|
|
|
-+ return;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ gt_ppi = irq_of_parse_and_map(np, 0);
|
|
|
|
|
-+ if (!gt_ppi) {
|
|
|
|
|
-+ pr_warn("global-timer: unable to parse irq\n");
|
|
|
|
|
-+ return;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ gt_base = of_iomap(np, 0);
|
|
|
|
|
-+ if (!gt_base) {
|
|
|
|
|
-+ pr_warn("global-timer: invalid base address\n");
|
|
|
|
|
-+ return;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ gt_clk = of_clk_get(np, 0);
|
|
|
|
|
-+ if (!IS_ERR(gt_clk)) {
|
|
|
|
|
-+ err = clk_prepare_enable(gt_clk);
|
|
|
|
|
-+ if (err)
|
|
|
|
|
-+ goto out_unmap;
|
|
|
|
|
-+ } else {
|
|
|
|
|
-+ pr_warn("global-timer: clk not found\n");
|
|
|
|
|
-+ err = -EINVAL;
|
|
|
|
|
-+ goto out_unmap;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ gt_clk_rate = clk_get_rate(gt_clk);
|
|
|
|
|
-+ gt_evt = alloc_percpu(struct clock_event_device);
|
|
|
|
|
-+ if (!gt_evt) {
|
|
|
|
|
-+ pr_warn("global-timer: can't allocate memory\n");
|
|
|
|
|
-+ err = -ENOMEM;
|
|
|
|
|
-+ goto out_clk;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ err = request_percpu_irq(gt_ppi, gt_clockevent_interrupt,
|
|
|
|
|
-+ "gt", gt_evt);
|
|
|
|
|
-+ if (err) {
|
|
|
|
|
-+ pr_warn("global-timer: can't register interrupt %d (%d)\n",
|
|
|
|
|
-+ gt_ppi, err);
|
|
|
|
|
-+ goto out_free;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ err = register_cpu_notifier(>_cpu_nb);
|
|
|
|
|
-+ if (err) {
|
|
|
|
|
-+ pr_warn("global-timer: unable to register cpu notifier.\n");
|
|
|
|
|
-+ goto out_irq;
|
|
|
|
|
-+ }
|
|
|
|
|
-+
|
|
|
|
|
-+ /* Immediately configure the timer on the boot CPU */
|
|
|
|
|
-+ gt_clocksource_init();
|
|
|
|
|
-+ gt_clockevents_init(this_cpu_ptr(gt_evt));
|
|
|
|
|
-+
|
|
|
|
|
-+ return;
|
|
|
|
|
-+
|
|
|
|
|
-+out_irq:
|
|
|
|
|
-+ free_percpu_irq(gt_ppi, gt_evt);
|
|
|
|
|
-+out_free:
|
|
|
|
|
-+ free_percpu(gt_evt);
|
|
|
|
|
-+out_clk:
|
|
|
|
|
-+ clk_disable_unprepare(gt_clk);
|
|
|
|
|
-+out_unmap:
|
|
|
|
|
-+ iounmap(gt_base);
|
|
|
|
|
-+ WARN(err, "ARM Global timer register failed (%d)\n", err);
|
|
|
|
|
-+}
|
|
|
|
|
-+
|
|
|
|
|
-+/* Only tested on r2p2 and r3p0 */
|
|
|
|
|
-+CLOCKSOURCE_OF_DECLARE(arm_gt, "arm,cortex-a9-global-timer",
|
|
|
|
|
-+ global_timer_of_register);
|
|
|