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-rw-r--r--arch/arm/mach-netx/time.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/arm/mach-netx/time.c b/arch/arm/mach-netx/time.c
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+++ b/arch/arm/mach-netx/time.c
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+/*
+ * arch/arm/mach-netx/time.c
+ *
+ * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mach/time.h>
+#include <asm/arch/netx-regs.h>
+
+/*
+ * Returns number of us since last clock interrupt. Note that interrupts
+ * will have been disabled by do_gettimeoffset()
+ */
+static unsigned long netx_gettimeoffset(void)
+{
+ return readl(NETX_GPIO_COUNTER_CURRENT(0)) / 100;
+}
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t
+netx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ write_seqlock(&xtime_lock);
+
+ timer_tick(regs);
+ write_sequnlock(&xtime_lock);
+
+ /* acknowledge interrupt */
+ writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
+
+ return IRQ_HANDLED;
+}
+
+
+static struct irqaction netx_timer_irq = {
+ .name = "NetX Timer Tick",
+ .flags = SA_INTERRUPT | SA_TIMER,
+ .handler = netx_timer_interrupt,
+};
+
+/*
+ * Set up timer interrupt
+ */
+static void __init netx_timer_init(void)
+{
+ /* disable timer initially */
+ writel(0, NETX_GPIO_COUNTER_CTRL(0));
+
+ /* Reset the timer value to zero */
+ writel(0, NETX_GPIO_COUNTER_CURRENT(0));
+
+ writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
+
+ /* acknowledge interrupt */
+ writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
+
+ /* Enable the interrupt in the specific timer register and start timer */
+ writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
+ writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
+ NETX_GPIO_COUNTER_CTRL(0));
+
+ setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
+}
+
+struct sys_timer netx_timer = {
+ .init = netx_timer_init,
+ .offset = netx_gettimeoffset,
+};