[PATCH 6/7] Samsung:SMDKV210: Init Uart Using Device Tree

[Shaju Abraham]

The SMDKV210 has 4 UARTs. Get the uart virtual address and irq numbers from
the Device tree. Fill the  platform structure witht hese values and the serial
driver makesuse of these parameters while initialising the uart driver.

Signed-off-by: Shaju Abraham <shaju.abraham at linaro.org>
---
 Makefile                   |    6 +-
 arch/arm/plat-s5p/irq_dt.c |   96 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 98 insertions(+), 4 deletions(-)

diff --git a/arch/arm/plat-s5p/irq_dt.c b/arch/arm/plat-s5p/irq_dt.c
index 317348f..e10fa42 100644
--- a/arch/arm/plat-s5p/irq_dt.c
+++ b/arch/arm/plat-s5p/irq_dt.c
@@ -58,6 +58,100 @@ static struct s3c_uart_irq uart_irqs[] = {
 	},
 #endif
 };
+/*HACK..this will go once the hardware irq-> linux irq infrastructure
+	is in place*/
+int s5p_of_map_irq(int controller, int irq)
+{
+	switch (controller) {
+
+	case 0:
+		return S5P_IRQ_VIC0(irq);
+	break;
+
+	case 1:
+		return S5P_IRQ_VIC1(irq);
+	break;
+
+	case 2:
+		return S5P_IRQ_VIC2(irq);
+	break;
+
+	case 3:
+		return S5P_IRQ_VIC3(irq);
+	break;
+	default:
+		printk(KERN_ERR"No controller defined for %d irq %d controller\n",
+			irq, controller);
+	}
+	return 0;
+}
+
+
+int s5p_of_get_virt_irq(struct device_node *node)
+{
+	const phandle *parp;
+	struct device_node *p;
+	int irq;
+	const u32 *prop;
+
+	prop = of_get_property(node, "interrupts", NULL);
+	if (prop == NULL) {
+		printk(KERN_ERR"No interrupt property defined for %s\n",
+				node->name);
+		return -EINVAL;
+	}
+	irq = of_read_ulong(prop, 1);
+	parp = of_get_property(node, "interrupt-parent", NULL);
+	if (parp == NULL) {
+		printk(KERN_ERR"No phandle for interrupt parent\n");
+		return irq;
+	} else {
+		p = of_find_node_by_phandle(*parp);
+		if (p == NULL) {
+			printk(KERN_ERR"No parent for %s\n", node->name);
+			return irq;
+		}
+
+	}
+/*handle onli VIC0~3, GPIO and External Irq logic tobe added*/
+	if (strcmp(p->name, "vic0") == 0)
+		return s5p_of_map_irq(0, irq);
+
+	if (strcmp(p->name, "vic1") == 0)
+		return s5p_of_map_irq(1, irq);
+
+	if (strcmp(p->name, "vic2") == 0)
+		return s5p_of_map_irq(2, irq);
+
+	if (strcmp(p->name, "vic3") == 0)
+		return s5p_of_map_irq(3, irq);
+
+	return 0;
+}
+
+
+void __init s5p_dt_init_uart(void)
+{
+	struct device_node *node;
+	int irq;
+	int i = 0;
+	const u32 *prop;
+	u32 virt_reg = 0;
+
+	for_each_compatible_node(node , NULL , "samsung,s3c-uart") {
+		prop = of_get_property(node, "virtual-reg", NULL);
+	if (prop)
+		virt_reg = of_read_number(prop, 1);
+		uart_irqs[i].regs = (void __iomem __force *) virt_reg;
+		irq = s5p_of_get_virt_irq(node);
+		uart_irqs[i].parent_irq = irq;
+		i++;
+	}
+
+	of_node_put(node);
+}
+
+
 int s5p_dt_init_vic_timer_irq(void)
 {
 	struct device_node *node;
@@ -111,5 +205,5 @@ void __init s5p_dt_init_irq(void)
 	s5p_dt_vic_init();
 	if (s5p_dt_init_vic_timer_irq())
 		printk(KERN_ERR"s5p_dt Timer init Failed\n");
-	s3c_init_uart_irqs(uart_irqs, ARRAY_SIZE(uart_irqs));
+	s5p_dt_init_uart();
 }
-- 
1.7.2