arm: vt8500: Update arch-vt8500 to devicetree support.

Merged existing board files to a single dt-capable file.
Converted irq and timer code to devicetree.
Removed existing device files that are no longer required with
devicetree support.
All existing platform devices are converted to devicetree nodes
except PWM.

Removed restart.c and moved code into vt8500.c to remove
duplicate PMC code.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 48 insertions, 19 deletions

diff --git a/arch/arm/mach-vt8500/timer.c b/arch/arm/mach-vt8500/timer.c
index d5376c592ab6..050e1833f2d0 100644
--- a/arch/arm/mach-vt8500/timer.c
+++ b/arch/arm/mach-vt8500/timer.c
@@ -1,6 +1,7 @@
 /*
- *  arch/arm/mach-vt8500/timer.c
+ *  arch/arm/mach-vt8500/timer_dt.c
  *
+ *  Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
  *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -18,18 +19,25 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+/*
+ * This file is copied and modified from the original timer.c provided by
+ * Alexey Charkov. Minor changes have been made for Device Tree Support.
+ */
+
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/delay.h>
-
 #include <asm/mach/time.h>
 
-#include "devices.h"
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 
 #define VT8500_TIMER_OFFSET	0x0100
+#define VT8500_TIMER_HZ		3000000
 #define TIMER_MATCH_VAL		0x0000
 #define TIMER_COUNT_VAL		0x0010
 #define TIMER_STATUS_VAL	0x0014
@@ -39,7 +47,6 @@
 #define TIMER_COUNT_R_ACTIVE	(1 << 5)	/* not ready for read */
 #define TIMER_COUNT_W_ACTIVE	(1 << 4)	/* not ready for write */
 #define TIMER_MATCH_W_ACTIVE	(1 << 0)	/* not ready for write */
-#define VT8500_TIMER_HZ		3000000
 
 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
 
@@ -55,7 +62,7 @@ static cycle_t vt8500_timer_read(struct clocksource *cs)
 	return readl(regbase + TIMER_COUNT_VAL);
 }
 
-struct clocksource clocksource = {
+static struct clocksource clocksource = {
 	.name           = "vt8500_timer",
 	.rating         = 200,
 	.read           = vt8500_timer_read,
@@ -98,7 +105,7 @@ static void vt8500_timer_set_mode(enum clock_event_mode mode,
 	}
 }
 
-struct clock_event_device clockevent = {
+static struct clock_event_device clockevent = {
 	.name           = "vt8500_timer",
 	.features       = CLOCK_EVT_FEAT_ONESHOT,
 	.rating         = 200,
@@ -115,26 +122,51 @@ static irqreturn_t vt8500_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-struct irqaction irq = {
+static struct irqaction irq = {
 	.name    = "vt8500_timer",
 	.flags   = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 	.handler = vt8500_timer_interrupt,
 	.dev_id  = &clockevent,
 };
 
-static void __init vt8500_timer_init(void)
+static struct of_device_id vt8500_timer_ids[] = {
+	{ .compatible = "via,vt8500-timer" },
+	{ }
+};
+
+void __init vt8500_timer_init(void)
 {
-	regbase = ioremap(wmt_pmc_base + VT8500_TIMER_OFFSET, 0x28);
-	if (!regbase)
-		printk(KERN_ERR "vt8500_timer_init: failed to map MMIO registers\n");
+	struct device_node *np;
+	int timer_irq;
+
+	np = of_find_matching_node(NULL, vt8500_timer_ids);
+	if (!np) {
+		pr_err("%s: Timer description missing from Device Tree\n",
+								__func__);
+		return;
+	}
+	regbase = of_iomap(np, 0);
+	if (!regbase) {
+		pr_err("%s: Missing iobase description in Device Tree\n",
+								__func__);
+		of_node_put(np);
+		return;
+	}
+	timer_irq = irq_of_parse_and_map(np, 0);
+	if (!timer_irq) {
+		pr_err("%s: Missing irq description in Device Tree\n",
+								__func__);
+		of_node_put(np);
+		return;
+	}
 
 	writel(1, regbase + TIMER_CTRL_VAL);
 	writel(0xf, regbase + TIMER_STATUS_VAL);
 	writel(~0, regbase + TIMER_MATCH_VAL);
 
 	if (clocksource_register_hz(&clocksource, VT8500_TIMER_HZ))
-		printk(KERN_ERR "vt8500_timer_init: clocksource_register failed for %s\n",
-					clocksource.name);
+		pr_err("%s: vt8500_timer_init: clocksource_register failed for %s\n",
+					__func__, clocksource.name);
 
 	clockevents_calc_mult_shift(&clockevent, VT8500_TIMER_HZ, 4);
 
@@ -144,12 +176,9 @@ static void __init vt8500_timer_init(void)
 	clockevent.min_delta_ns = clockevent_delta2ns(4, &clockevent);
 	clockevent.cpumask = cpumask_of(0);
 
-	if (setup_irq(wmt_timer_irq, &irq))
-		printk(KERN_ERR "vt8500_timer_init: setup_irq failed for %s\n",
-					clockevent.name);
+	if (setup_irq(timer_irq, &irq))
+		pr_err("%s: setup_irq failed for %s\n", __func__,
+							clockevent.name);
 	clockevents_register_device(&clockevent);
 }
 
-struct sys_timer vt8500_timer = {
-	.init = vt8500_timer_init
-};