ARM: shmobile: r8a7778: add r8a7778_init_irq_extpin()

This patch adds r8a7778_init_irq_extpin() for IRQ0 - IRQ3.
But this patch doesn't enable DT settings on r8a7778.dts,
because R8A7778 chip external IRQ depends on
IRQ0 - IRQ3 pin encoding which came from platform board
implementation.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

2 files changed, 45 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/include/mach/r8a7778.h b/arch/arm/mach-shmobile/include/mach/r8a7778.h
index a755dcafef4d..e0c620571c33 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a7778.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a7778.h
@@ -24,5 +24,6 @@ extern void r8a7778_init_delay(void);
 extern void r8a7778_init_irq(void);
 extern void r8a7778_init_irq_dt(void);
 extern void r8a7778_clock_init(void);
+extern void r8a7778_init_irq_extpin(int irlm);
 
 #endif /* __ASM_R8A7778_H__ */
diff --git a/arch/arm/mach-shmobile/setup-r8a7778.c b/arch/arm/mach-shmobile/setup-r8a7778.c
index 57d6b0eba445..288230540d19 100644
--- a/arch/arm/mach-shmobile/setup-r8a7778.c
+++ b/arch/arm/mach-shmobile/setup-r8a7778.c
@@ -23,6 +23,7 @@
 #include <linux/irqchip/arm-gic.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/platform_data/irq-renesas-intc-irqpin.h>
 #include <linux/platform_device.h>
 #include <linux/irqchip.h>
 #include <linux/serial_sci.h>
@@ -110,6 +111,49 @@ void __init r8a7778_add_standard_devices(void)
         r8a7778_register_tmu(1);
 }
 
+static struct renesas_intc_irqpin_config irqpin_platform_data = {
+        .irq_base = irq_pin(0), /* IRQ0 -> IRQ3 */
+        .sense_bitfield_width = 2,
+};
+
+static struct resource irqpin_resources[] = {
+        DEFINE_RES_MEM(0xfe78001c, 4), /* ICR1 */
+        DEFINE_RES_MEM(0xfe780010, 4), /* INTPRI */
+        DEFINE_RES_MEM(0xfe780024, 4), /* INTREQ */
+        DEFINE_RES_MEM(0xfe780044, 4), /* INTMSK0 */
+        DEFINE_RES_MEM(0xfe780064, 4), /* INTMSKCLR0 */
+        DEFINE_RES_IRQ(gic_iid(0x3b)), /* IRQ0 */
+        DEFINE_RES_IRQ(gic_iid(0x3c)), /* IRQ1 */
+        DEFINE_RES_IRQ(gic_iid(0x3d)), /* IRQ2 */
+        DEFINE_RES_IRQ(gic_iid(0x3e)), /* IRQ3 */
+};
+
+void __init r8a7778_init_irq_extpin(int irlm)
+{
+        void __iomem *icr0 = ioremap_nocache(0xfe780000, PAGE_SIZE);
+        unsigned long tmp;
+
+        if (!icr0) {
+                pr_warn("r8a7778: unable to setup external irq pin mode\n");
+                return;
+        }
+
+        tmp = ioread32(icr0);
+        if (irlm)
+                tmp |= 1 << 23; /* IRQ0 -> IRQ3 as individual pins */
+        else
+                tmp &= ~(1 << 23); /* IRL mode - not supported */
+        tmp |= (1 << 21); /* LVLMODE = 1 */
+        iowrite32(tmp, icr0);
+        iounmap(icr0);
+
+        if (irlm)
+                platform_device_register_resndata(
+                        &platform_bus, "renesas_intc_irqpin", -1,
+                        irqpin_resources, ARRAY_SIZE(irqpin_resources),
+                        &irqpin_platform_data, sizeof(irqpin_platform_data));
+}
+
 #define INT2SMSKCR0     0x82288 /* 0xfe782288 */
 #define INT2SMSKCR1     0x8228c /* 0xfe78228c */