ARM: PRIMA2: rstc: enable the support for Marco

marco has SET/CLEAR registers pair for rstc to avoid read-modify-write,
this patch detects the mach typer and access registers based on SoC.
Signed-off-by: Barry Song <Baohua.Song@csr.com>

arch/arm/mach-prima2/rstc.c

@@ -19,6 +19,7 @@ static DEFINE_MUTEX(rstc_lock);
 
 static struct of_device_id rstc_ids[]  = {
 	{ .compatible = "sirf,prima2-rstc" },
+	{ .compatible = "sirf,marco-rstc" },
 	{},
 };
 
@@ -42,16 +43,14 @@ early_initcall(sirfsoc_of_rstc_init);
 
 int sirfsoc_reset_device(struct device *dev)
 {
-	const unsigned int *prop = of_get_property(dev->of_node, "reset-bit", NULL);
-	unsigned int reset_bit;
+	u32 reset_bit;
 
-	if (!prop)
-		return -ENODEV;
-
-	reset_bit = be32_to_cpup(prop);
+	if (of_property_read_u32(dev->of_node, "reset-bit", &reset_bit))
+		return -EINVAL;
 
 	mutex_lock(&rstc_lock);
 
+	if (of_device_is_compatible(dev->of_node, "sirf,prima2-rstc")) {
 		/*
 		 * Writing 1 to this bit resets corresponding block. Writing 0 to this
 		 * bit de-asserts reset signal of the corresponding block.
@@ -63,6 +62,18 @@ int sirfsoc_reset_device(struct device *dev)
 		msleep(10);
 		writel(readl(sirfsoc_rstc_base + (reset_bit / 32) * 4) & ~reset_bit,
 			sirfsoc_rstc_base + (reset_bit / 32) * 4);
+	} else {
+		/*
+		 * For MARCO and POLO
+		 * Writing 1 to SET register resets corresponding block. Writing 1 to CLEAR
+		 * register de-asserts reset signal of the corresponding block.
+		 * datasheet doesn't require explicit delay between the set and clear
+		 * of reset bit. it could be shorter if tests pass.
+		 */
+		writel(reset_bit, sirfsoc_rstc_base + (reset_bit / 32) * 8);
+		msleep(10);
+		writel(reset_bit, sirfsoc_rstc_base + (reset_bit / 32) * 8 + 4);
+	}
 
 	mutex_unlock(&rstc_lock);