ARM: mach-shmobile: sh73a0 and AG5EVM PINT support

Support PINT on sh73a0 and AG5EVM using INTC PINT macros.

With this patch applied the AG5EVM ethernet is handled
through one of the chained sh73a0 PINT interrupt controllers.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/arm/mach-shmobile/board-ag5evm.c

@@ -59,7 +59,7 @@ static struct resource smsc9220_resources[] = {
 		.flags		= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start		= gic_spi(33), /* PINT1 */
+		.start		= SH73A0_PINT0_IRQ(2), /* PINTA2 */
 		.flags		= IORESOURCE_IRQ,
 	},
 };
@@ -474,19 +474,6 @@ static void __init ag5evm_map_io(void)
 	shmobile_setup_console();
 }
 
-#define PINTC_ADDR	0xe6900000
-#define PINTER0A	(PINTC_ADDR + 0xa0)
-#define PINTCR0A	(PINTC_ADDR + 0xb0)
-
-void __init ag5evm_init_irq(void)
-{
-	sh73a0_init_irq();
-
-	/* setup PINT: enable PINTA2 as active low */
-	__raw_writel(__raw_readl(PINTER0A) | (1<<29), PINTER0A);
-	__raw_writew(__raw_readw(PINTCR0A) | (2<<10), PINTCR0A);
-}
-
 #define DSI0PHYCR	0xe615006c
 
 static void __init ag5evm_init(void)
@@ -620,7 +607,7 @@ struct sys_timer ag5evm_timer = {
 
 MACHINE_START(AG5EVM, "ag5evm")
 	.map_io		= ag5evm_map_io,
-	.init_irq	= ag5evm_init_irq,
+	.init_irq	= sh73a0_init_irq,
 	.handle_irq	= shmobile_handle_irq_gic,
 	.init_machine	= ag5evm_init,
 	.timer		= &ag5evm_timer,

arch/arm/mach-shmobile/include/mach/sh73a0.h

@@ -507,4 +507,8 @@ enum {
 	SHDMA_SLAVE_MMCIF_RX,
 };
 
+/* PINT interrupts are located at Linux IRQ 768 and up */
+#define SH73A0_PINT0_IRQ(irq) ((irq) + 768)
+#define SH73A0_PINT1_IRQ(irq) ((irq) + 800)
+
 #endif /* __ASM_SH73A0_H__ */

arch/arm/mach-shmobile/intc-sh73a0.c

@@ -23,6 +23,7 @@
 #include <linux/io.h>
 #include <linux/sh_intc.h>
 #include <mach/intc.h>
+#include <mach/sh73a0.h>
 #include <asm/hardware/gic.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -363,6 +364,59 @@ static irqreturn_t sh73a0_irq_pin_demux(int irq, void *dev_id)
 
 static struct irqaction sh73a0_irq_pin_cascade[32];
 
+#define PINTER0 0xe69000a0
+#define PINTER1 0xe69000a4
+#define PINTRR0 0xe69000d0
+#define PINTRR1 0xe69000d4
+
+#define PINT0A_IRQ(n, irq) INTC_IRQ((n), SH73A0_PINT0_IRQ(irq))
+#define PINT0B_IRQ(n, irq) INTC_IRQ((n), SH73A0_PINT0_IRQ(irq + 8))
+#define PINT0C_IRQ(n, irq) INTC_IRQ((n), SH73A0_PINT0_IRQ(irq + 16))
+#define PINT0D_IRQ(n, irq) INTC_IRQ((n), SH73A0_PINT0_IRQ(irq + 24))
+#define PINT1E_IRQ(n, irq) INTC_IRQ((n), SH73A0_PINT1_IRQ(irq))
+
+INTC_PINT(intc_pint0, PINTER0, 0xe69000b0, "sh73a0-pint0",		\
+  INTC_PINT_E(A), INTC_PINT_E(B), INTC_PINT_E(C), INTC_PINT_E(D),	\
+  INTC_PINT_V(A, PINT0A_IRQ), INTC_PINT_V(B, PINT0B_IRQ),		\
+  INTC_PINT_V(C, PINT0C_IRQ), INTC_PINT_V(D, PINT0D_IRQ),		\
+  INTC_PINT_E(A), INTC_PINT_E(B), INTC_PINT_E(C), INTC_PINT_E(D),	\
+  INTC_PINT_E(A), INTC_PINT_E(B), INTC_PINT_E(C), INTC_PINT_E(D));
+
+INTC_PINT(intc_pint1, PINTER1, 0xe69000c0, "sh73a0-pint1",		\
+  INTC_PINT_E(E), INTC_PINT_E_EMPTY, INTC_PINT_E_EMPTY, INTC_PINT_E_EMPTY, \
+  INTC_PINT_V(E, PINT1E_IRQ), INTC_PINT_V_NONE,				\
+  INTC_PINT_V_NONE, INTC_PINT_V_NONE,					\
+  INTC_PINT_E_NONE, INTC_PINT_E_NONE, INTC_PINT_E_NONE, INTC_PINT_E(E), \
+  INTC_PINT_E(E), INTC_PINT_E_NONE, INTC_PINT_E_NONE, INTC_PINT_E_NONE);
+
+static struct irqaction sh73a0_pint0_cascade;
+static struct irqaction sh73a0_pint1_cascade;
+
+static void pint_demux(unsigned long rr, unsigned long er, int base_irq)
+{
+	unsigned long value =  ioread32(rr) & ioread32(er);
+	int k;
+
+	for (k = 0; k < 32; k++) {
+		if (value & (1 << (31 - k))) {
+			generic_handle_irq(base_irq + k);
+			iowrite32(~(1 << (31 - k)), rr);
+		}
+	}
+}
+
+static irqreturn_t sh73a0_pint0_demux(int irq, void *dev_id)
+{
+	pint_demux(PINTRR0, PINTER0, SH73A0_PINT0_IRQ(0));
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t sh73a0_pint1_demux(int irq, void *dev_id)
+{
+	pint_demux(PINTRR1, PINTER1, SH73A0_PINT1_IRQ(0));
+	return IRQ_HANDLED;
+}
+
 void __init sh73a0_init_irq(void)
 {
 	void __iomem *gic_dist_base = __io(0xf0001000);
@@ -375,6 +429,8 @@ void __init sh73a0_init_irq(void)
 
 	register_intc_controller(&intcs_desc);
 	register_intc_controller(&intca_irq_pins_desc);
+	register_intc_controller(&intc_pint0_desc);
+	register_intc_controller(&intc_pint1_desc);
 
 	/* demux using INTEVTSA */
 	sh73a0_intcs_cascade.name = "INTCS cascade";
@@ -393,4 +449,13 @@ void __init sh73a0_init_irq(void)
 					      handle_level_irq, "level");
 		set_irq_flags(n, IRQF_VALID); /* yuck */
 	}
+
+	/* PINT pins are sanely tied to the GIC as SPI */
+	sh73a0_pint0_cascade.name = "PINT0 cascade";
+	sh73a0_pint0_cascade.handler = sh73a0_pint0_demux;
+	setup_irq(gic_spi(33), &sh73a0_pint0_cascade);
+
+	sh73a0_pint1_cascade.name = "PINT1 cascade";
+	sh73a0_pint1_cascade.handler = sh73a0_pint1_demux;
+	setup_irq(gic_spi(34), &sh73a0_pint1_cascade);
 }