[PATCH] ARM: clocksource: add support for MOXA ART SoCs
From: Jonas Jensen
Date: Tue Jun 18 2013 - 06:00:22 EST
This patch adds an clocksource driver for the main timer found
on MOXA ART SoCs.
Applies to 3.10-rc1 and arm-soc/for-next (2013-06-15)
Signed-off-by: Jonas Jensen <jonas.jensen@xxxxxxxxx>
---
drivers/clocksource/Makefile | 1 +
drivers/clocksource/moxart_timer.c | 129 ++++++++++++++++++++++++++++++++++++
2 files changed, 130 insertions(+), 0 deletions(-)
create mode 100644 drivers/clocksource/moxart_timer.c
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 8d979c7..c93e1a8 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_CLKSRC_SAMSUNG_PWM) += samsung_pwm_timer.o
obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
+obj-$(CONFIG_ARCH_MOXART) += moxart_timer.o
diff --git a/drivers/clocksource/moxart_timer.c b/drivers/clocksource/moxart_timer.c
new file mode 100644
index 0000000..ce5a5a2
--- /dev/null
+++ b/drivers/clocksource/moxart_timer.c
@@ -0,0 +1,129 @@
+/*
+ * MOXA ART SoCs timer handling.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@xxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqreturn.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/clocksource.h>
+
+#include <asm/mach/time.h>
+
+#define APB_CLK 48000000
+
+#define TIMER_1_COUNT(base_addr) (base_addr + 0x00)
+#define TIMER_1_LOAD(base_addr) (base_addr + 0x04)
+#define TIMER_1_MATCH1(base_addr) (base_addr + 0x08)
+#define TIMER_1_MATCH2(base_addr) (base_addr + 0x0C)
+
+#define TIMER_2_COUNT(base_addr) (base_addr + 0x10)
+#define TIMER_2_LOAD(base_addr) (base_addr + 0x14)
+#define TIMER_2_MATCH1(base_addr) (base_addr + 0x18)
+#define TIMER_2_MATCH2(base_addr) (base_addr + 0x1C)
+
+#define TIMER_3_COUNT(base_addr) (base_addr + 0x20)
+#define TIMER_3_LOAD(base_addr) (base_addr + 0x24)
+#define TIMER_3_MATCH1(base_addr) (base_addr + 0x28)
+#define TIMER_3_MATCH2(base_addr) (base_addr + 0x2C)
+
+#define TIMER_CR(base_addr) (base_addr + 0x30)
+
+#define TIMER_1_CR_ENABLE(base_addr) (base_addr + 0x30)
+#define TIMER_1_CR_EXTCLK(base_addr) (base_addr + 0x34)
+#define TIMER_1_CR_FLOWIN(base_addr) (base_addr + 0x38)
+
+#define TIMER_2_CR_ENABLE(base_addr) (base_addr + 0x42)
+#define TIMER_2_CR_EXTCLK(base_addr) (base_addr + 0x46)
+#define TIMER_2_CR_FLOWIN(base_addr) (base_addr + 0x50)
+
+#define TIMER_3_CR_ENABLE(base_addr) (base_addr + 0x54)
+#define TIMER_3_CR_EXTCLK(base_addr) (base_addr + 0x58)
+#define TIMER_3_CR_FLOWIN(base_addr) (base_addr + 0x62)
+
+#define TIMER_INTR_STATE(base_addr) (base_addr + 0x34)
+
+#define TIMEREG_1_CR_ENABLE (1 << 0)
+#define TIMEREG_1_CR_CLOCK (1 << 1)
+#define TIMEREG_1_CR_INT (1 << 2)
+#define TIMEREG_2_CR_ENABLE (1 << 3)
+#define TIMEREG_2_CR_CLOCK (1 << 4)
+#define TIMEREG_2_CR_INT (1 << 5)
+#define TIMEREG_3_CR_ENABLE (1 << 6)
+#define TIMEREG_3_CR_CLOCK (1 << 7)
+#define TIMEREG_3_CR_INT (1 << 8)
+#define TIMEREG_COUNT_UP (1 << 9)
+#define TIMEREG_COUNT_DOWN (0 << 9)
+
+#define MAX_TIMER 2
+#define USED_TIMER 1
+
+#define TIMER1_COUNT 0x0
+#define TIMER1_LOAD 0x4
+#define TIMER1_MATCH1 0x8
+#define TIMER1_MATCH2 0xC
+#define TIMER2_COUNT 0x10
+#define TIMER2_LOAD 0x14
+#define TIMER2_MATCH1 0x18
+#define TIMER2_MATCH2 0x1C
+#define TIMER3_COUNT 0x20
+#define TIMER3_LOAD 0x24
+#define TIMER3_MATCH1 0x28
+#define TIMER3_MATCH2 0x2C
+#define TIMER_INTR_MASK 0x38
+
+static void __iomem *timer_base;
+
+static irqreturn_t moxart_timer_interrupt(int irq, void *dev_id)
+{
+ timer_tick();
+ return IRQ_HANDLED;
+}
+
+static struct irqaction moxart_timer_irq = {
+ .name = "moxart-timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = moxart_timer_interrupt,
+};
+
+static void __init moxart_timer_init(struct device_node *node)
+{
+ int ret, irq;
+
+ timer_base = of_iomap(node, 0);
+ if (!timer_base)
+ panic("%s: failed to map base\n", node->full_name);
+
+ irq = irq_of_parse_and_map(node, 0);
+ if (irq <= 0)
+ panic("%s: can't parse IRQ\n", node->full_name);
+
+ ret = setup_irq(irq, &moxart_timer_irq);
+ if (ret)
+ pr_warn("%s: failed to setup IRQ %d\n", node->full_name, irq);
+
+
+ writel(APB_CLK / HZ, TIMER_1_COUNT(timer_base));
+ writel(APB_CLK / HZ, TIMER_1_LOAD(timer_base));
+
+ writel(1, TIMER_1_CR_ENABLE(timer_base));
+ writel(0, TIMER_1_CR_EXTCLK(timer_base));
+ writel(1, TIMER_1_CR_FLOWIN(timer_base));
+
+ pr_info("%s: count/load (APB_CLK=%d/HZ=%d) IRQ=%d\n",
+ node->full_name, APB_CLK, HZ, irq);
+}
+CLOCKSOURCE_OF_DECLARE(moxart, "moxa,moxart-timer", moxart_timer_init);
+
--
1.7.2.5
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