ARM: S5P6440: Add IRQ support

This patch adds IRQ support for S5P6440 CPU.

Signed-off-by: Adityapratap Sharma <aditya.ps@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

2 files changed, 156 insertions, 0 deletions

diff --git a/arch/arm/plat-s5p/include/plat/irqs.h b/arch/arm/plat-s5p/include/plat/irqs.h
new file mode 100644
index 000000000000..5d7937dddad2
--- /dev/null
+++ b/arch/arm/plat-s5p/include/plat/irqs.h
@@ -0,0 +1,83 @@
+/* linux/arch/arm/plat-s5p/include/plat/irqs.h
+ *
+ * Copyright (c) 2009 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com/
+ *
+ * S5P Common IRQ support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifndef __ASM_PLAT_S5P_IRQS_H
+#define __ASM_PLAT_S5P_IRQS_H __FILE__
+
+/* we keep the first set of CPU IRQs out of the range of
+ * the ISA space, so that the PC104 has them to itself
+ * and we don't end up having to do horrible things to the
+ * standard ISA drivers....
+ *
+ * note, since we're using the VICs, our start must be a
+ * mulitple of 32 to allow the common code to work
+ */
+
+#define S5P_IRQ_OFFSET          (32)
+
+#define S5P_IRQ(x)              ((x) + S5P_IRQ_OFFSET)
+
+#define S5P_VIC0_BASE           S5P_IRQ(0)
+#define S5P_VIC1_BASE           S5P_IRQ(32)
+
+#define IRQ_VIC0_BASE           S5P_VIC0_BASE
+#define IRQ_VIC1_BASE           S5P_VIC1_BASE
+
+/* UART interrupts, each UART has 4 intterupts per channel so
+ * use the space between the ISA and S3C main interrupts. Note, these
+ * are not in the same order as the S3C24XX series! */
+
+#define IRQ_S5P_UART_BASE0      (16)
+#define IRQ_S5P_UART_BASE1      (20)
+#define IRQ_S5P_UART_BASE2      (24)
+#define IRQ_S5P_UART_BASE3      (28)
+
+#define UART_IRQ_RXD            (0)
+#define UART_IRQ_ERR            (1)
+#define UART_IRQ_TXD            (2)
+
+#define IRQ_S5P_UART_RX0        (IRQ_S5P_UART_BASE0 + UART_IRQ_RXD)
+#define IRQ_S5P_UART_TX0        (IRQ_S5P_UART_BASE0 + UART_IRQ_TXD)
+#define IRQ_S5P_UART_ERR0       (IRQ_S5P_UART_BASE0 + UART_IRQ_ERR)
+
+#define IRQ_S5P_UART_RX1        (IRQ_S5P_UART_BASE1 + UART_IRQ_RXD)
+#define IRQ_S5P_UART_TX1        (IRQ_S5P_UART_BASE1 + UART_IRQ_TXD)
+#define IRQ_S5P_UART_ERR1       (IRQ_S5P_UART_BASE1 + UART_IRQ_ERR)
+
+#define IRQ_S5P_UART_RX2        (IRQ_S5P_UART_BASE2 + UART_IRQ_RXD)
+#define IRQ_S5P_UART_TX2        (IRQ_S5P_UART_BASE2 + UART_IRQ_TXD)
+#define IRQ_S5P_UART_ERR2       (IRQ_S5P_UART_BASE2 + UART_IRQ_ERR)
+
+#define IRQ_S5P_UART_RX3        (IRQ_S5P_UART_BASE3 + UART_IRQ_RXD)
+#define IRQ_S5P_UART_TX3        (IRQ_S5P_UART_BASE3 + UART_IRQ_TXD)
+#define IRQ_S5P_UART_ERR3       (IRQ_S5P_UART_BASE3 + UART_IRQ_ERR)
+
+/* S3C compatibilty defines */
+#define IRQ_S3CUART_RX0         IRQ_S5P_UART_RX0
+#define IRQ_S3CUART_RX1         IRQ_S5P_UART_RX1
+#define IRQ_S3CUART_RX2         IRQ_S5P_UART_RX2
+#define IRQ_S3CUART_RX3         IRQ_S5P_UART_RX3
+
+/* VIC based IRQs */
+
+#define S5P_IRQ_VIC0(x)         (S5P_VIC0_BASE + (x))
+#define S5P_IRQ_VIC1(x)         (S5P_VIC1_BASE + (x))
+
+#define S5P_TIMER_IRQ(x)        S5P_IRQ(64 + (x))
+
+#define IRQ_TIMER0              S5P_TIMER_IRQ(0)
+#define IRQ_TIMER1              S5P_TIMER_IRQ(1)
+#define IRQ_TIMER2              S5P_TIMER_IRQ(2)
+#define IRQ_TIMER3              S5P_TIMER_IRQ(3)
+#define IRQ_TIMER4              S5P_TIMER_IRQ(4)
+
+#endif /* __ASM_PLAT_S5P_IRQS_H */
diff --git a/arch/arm/plat-s5p/irq.c b/arch/arm/plat-s5p/irq.c
new file mode 100644
index 000000000000..eada40d0847d
--- /dev/null
+++ b/arch/arm/plat-s5p/irq.c
@@ -0,0 +1,73 @@
+/* arch/arm/plat-s5p/irq.c
+ *
+ * Copyright (c) 2009 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com/
+ *
+ * S5P - Interrupt handling
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/hardware/vic.h>
+
+#include <linux/serial_core.h>
+#include <mach/map.h>
+#include <plat/regs-timer.h>
+#include <plat/regs-serial.h>
+#include <plat/cpu.h>
+#include <plat/irq-vic-timer.h>
+#include <plat/irq-uart.h>
+
+#define VIC_VAADDR(no)  (S5P_VA_VIC0   + ((no)*0x10000))
+#define VIC_BASE(no)    (S5P_VIC0_BASE + ((no)*32))
+
+/*
+ * Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
+ * are consecutive when looking up the interrupt in the demux routines.
+ */
+static struct s3c_uart_irq uart_irqs[] = {
+        [0] = {
+                .regs           = S5P_VA_UART0,
+                .base_irq       = IRQ_S5P_UART_BASE0,
+                .parent_irq     = IRQ_UART0,
+        },
+        [1] = {
+                .regs           = S5P_VA_UART1,
+                .base_irq       = IRQ_S5P_UART_BASE1,
+                .parent_irq     = IRQ_UART1,
+        },
+        [2] = {
+                .regs           = S5P_VA_UART2,
+                .base_irq       = IRQ_S5P_UART_BASE2,
+                .parent_irq     = IRQ_UART2,
+        },
+        [3] = {
+                .regs           = S5P_VA_UART3,
+                .base_irq       = IRQ_S5P_UART_BASE3,
+                .parent_irq     = IRQ_UART3,
+        },
+};
+
+void __init s5p_init_irq(u32 *vic, u32 num_vic)
+{
+        int irq;
+
+        /* initialize the VICs */
+        for (irq = 0; irq < num_vic; irq++)
+                vic_init(VIC_VAADDR(irq), VIC_BASE(irq), vic[irq], 0);
+
+        s3c_init_vic_timer_irq(IRQ_TIMER0_VIC, IRQ_TIMER0);
+        s3c_init_vic_timer_irq(IRQ_TIMER1_VIC, IRQ_TIMER1);
+        s3c_init_vic_timer_irq(IRQ_TIMER2_VIC, IRQ_TIMER2);
+        s3c_init_vic_timer_irq(IRQ_TIMER3_VIC, IRQ_TIMER3);
+        s3c_init_vic_timer_irq(IRQ_TIMER4_VIC, IRQ_TIMER4);
+
+        s3c_init_uart_irqs(uart_irqs, ARRAY_SIZE(uart_irqs));
+}