[PATCH v2 2/7] ARM: mmp: parse timer configuration from DT

[Haojian Zhuang]

Parse timer configuration from DT. Now we can merge pxa910_timer and
mmp2_timer into mmp_timer. Since most configuration between these two
timers are same. The difference is recorded in DT.

Signed-off-by: Haojian Zhuang <haojian.zhuang at marvell.com>
---
 .../devicetree/bindings/arm/marvell/timer.txt      |   24 +++++++++
 arch/arm/mach-mmp/common.h                         |    2 +
 arch/arm/mach-mmp/time.c                           |   50 +++++++++++++++++++-
 3 files changed, 75 insertions(+), 1 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/marvell/timer.txt

diff --git a/Documentation/devicetree/bindings/arm/marvell/timer.txt b/Documentation/devicetree/bindings/arm/marvell/timer.txt
new file mode 100644
index 0000000..24a6f97
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/marvell/timer.txt
@@ -0,0 +1,24 @@
+* Timer Controller Binding for ARCH-MMP
+
+This binding specifies what properties must be available in device tree
+representation of an ARCH-MMP compliant timer controller.
+
+Required properties:
+
+	- compatible: Specifies the compatibility list of the timer controller.
+	  The type shall be <string> and the value shall be
+	  "mrvl,pxa168-timer".
+
+	- mrvl,clk-conf: Specifies the address and value of timer 
+	  configuration register.
+	  The type shall be <prop-encoded-array>. The first value indicates
+	  the physical address of timer configuration register. The second
+	  value indicates data should be written to timer configuration
+	  register.
+
+* Example
+
+	mmp_timer: {
+		compatible = "mrvl,pxa168-timer";
+		mrvl,clk-conf = <0xd4000034 0x33>;
+	};
diff --git a/arch/arm/mach-mmp/common.h b/arch/arm/mach-mmp/common.h
index 1c563c2..890c664 100644
--- a/arch/arm/mach-mmp/common.h
+++ b/arch/arm/mach-mmp/common.h
@@ -2,6 +2,8 @@
 
 struct sys_timer;
 
+extern struct sys_timer mmp_timer;
+
 extern void timer_init(int irq);
 
 extern void __init icu_init_irq(void);
diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
index 99833b9..5a90b27 100644
--- a/arch/arm/mach-mmp/time.c
+++ b/arch/arm/mach-mmp/time.c
@@ -25,6 +25,8 @@
 
 #include <linux/io.h>
 #include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/sched.h>
 
 #include <asm/sched_clock.h>
@@ -150,7 +152,7 @@ static void __init timer_config(void)
 
 	__raw_writel(cer & ~0x1, TIMERS_VIRT_BASE + TMR_CER); /* disable */
 
-	ccr &= (cpu_is_mmp2()) ? TMR_CCR_CS_0(0) : TMR_CCR_CS_0(3);
+	ccr &= TMR_CCR_CS_0(0);
 	__raw_writel(ccr, TIMERS_VIRT_BASE + TMR_CCR);
 
 	/* free-running mode */
@@ -187,3 +189,49 @@ void __init timer_init(int irq)
 	clocksource_register_hz(&cksrc, CLOCK_TICK_RATE);
 	clockevents_register_device(&ckevt);
 }
+
+#ifdef CONFIG_OF
+static void __init mmp_timer_init(void)
+{
+	struct device_node *np;
+	const __be32 *clk_offs;
+	void __iomem *conf;
+	unsigned int addr = 0, offs = 0;
+	int size, irq;
+
+	np = of_find_compatible_node(NULL, NULL, "mrvl,pxa168-timer");
+
+	BUG_ON(!np);
+
+	of_node_get(np);
+	irq = irq_of_parse_and_map(np, 0);
+
+	clk_offs = of_get_property(np, "mrvl,clk-conf", &size);
+	if ((clk_offs == NULL) || (size != sizeof(int) * 2)) {
+		pr_warn("mmp-timer: mrvl,clk-conf property is wrong\n");
+		goto out;
+	}
+	addr = be32_to_cpu(*clk_offs) & PAGE_MASK;
+	offs = be32_to_cpu(*clk_offs) - addr;
+	conf = ioremap(addr, PAGE_SIZE);
+	if (conf == NULL) {
+		pr_warn("mmp-timer: failed on mapping 0x%x\n", (uint32_t)conf);
+		goto out;
+	}
+	/* reset and configure */
+	__raw_writel(APBC_APBCLK | APBC_RST, conf + offs);
+	__raw_writel(be32_to_cpu(*++clk_offs), conf + offs);
+	__raw_readl(conf + offs);
+	iounmap(conf);
+
+	timer_init(irq);
+	return;
+out:
+	of_node_put(np);
+	return;
+}
+
+struct sys_timer mmp_timer = {
+	.init	= mmp_timer_init,
+};
+#endif
-- 
1.5.6.5