[ARM] 3567/2: arm: base support for Hilscher netX

Patch from Sascha Hauer

This patch adds the base support for Hilscher's netX network
processors.

Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 88 insertions, 0 deletions

diff --git a/arch/arm/mach-netx/time.c b/arch/arm/mach-netx/time.c
new file mode 100644
index 000000000000..edfbdf40c600
--- /dev/null
+++ b/arch/arm/mach-netx/time.c
@@ -0,0 +1,88 @@
+/*
+ * 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,
+};