davinci: INTC: add support for TI cp_intc

Add support for Texas Instuments Common Platform Interrupt Controller
(cp_intc) used on DA830/OMAP-L137.

Signed-off-by: Steve Chen <schen@mvista.com>
Signed-off-by: Mark Greer <mgreer@mvista.com>
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

4 files changed, 222 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index a9c78bc72b84..56cd03f908e2 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -1,5 +1,8 @@
 if ARCH_DAVINCI
 
+config CP_INTC
+        bool
+
 menu "TI DaVinci Implementations"
 
 comment "DaVinci Core Type"
diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
index 1674661942f3..9a696ae60fca 100644
--- a/arch/arm/mach-davinci/Makefile
+++ b/arch/arm/mach-davinci/Makefile
@@ -8,6 +8,7 @@ obj-y 			:= time.o irq.o clock.o serial.o io.o id.o psc.o \
                            gpio.o devices.o dma.o usb.o
 
 obj-$(CONFIG_DAVINCI_MUX)               += mux.o
+obj-$(CONFIG_CP_INTC)                   += cp_intc.o
 
 # Chip specific
 obj-$(CONFIG_ARCH_DAVINCI_DM644x)       += dm644x.o
diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
new file mode 100644
index 000000000000..96c8e97a7deb
--- /dev/null
+++ b/arch/arm/mach-davinci/cp_intc.c
@@ -0,0 +1,161 @@
+/*
+ * TI Common Platform Interrupt Controller (cp_intc) driver
+ *
+ * Author: Steve Chen <schen@mvista.com>
+ * Copyright (C) 2008-2009, MontaVista Software, Inc. <source@mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/cp_intc.h>
+
+static void __iomem *cp_intc_base;
+
+static inline unsigned int cp_intc_read(unsigned offset)
+{
+        return __raw_readl(cp_intc_base + offset);
+}
+
+static inline void cp_intc_write(unsigned long value, unsigned offset)
+{
+        __raw_writel(value, cp_intc_base + offset);
+}
+
+static void cp_intc_ack_irq(unsigned int irq)
+{
+        cp_intc_write(irq, CP_INTC_SYS_STAT_IDX_CLR);
+}
+
+/* Disable interrupt */
+static void cp_intc_mask_irq(unsigned int irq)
+{
+        /* XXX don't know why we need to disable nIRQ here... */
+        cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_CLR);
+        cp_intc_write(irq, CP_INTC_SYS_ENABLE_IDX_CLR);
+        cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET);
+}
+
+/* Enable interrupt */
+static void cp_intc_unmask_irq(unsigned int irq)
+{
+        cp_intc_write(irq, CP_INTC_SYS_ENABLE_IDX_SET);
+}
+
+static int cp_intc_set_irq_type(unsigned int irq, unsigned int flow_type)
+{
+        unsigned reg            = BIT_WORD(irq);
+        unsigned mask           = BIT_MASK(irq);
+        unsigned polarity       = cp_intc_read(CP_INTC_SYS_POLARITY(reg));
+        unsigned type           = cp_intc_read(CP_INTC_SYS_TYPE(reg));
+
+        switch (flow_type) {
+        case IRQ_TYPE_EDGE_RISING:
+                polarity |= mask;
+                type |= mask;
+                break;
+        case IRQ_TYPE_EDGE_FALLING:
+                polarity &= ~mask;
+                type |= mask;
+                break;
+        case IRQ_TYPE_LEVEL_HIGH:
+                polarity |= mask;
+                type &= ~mask;
+                break;
+        case IRQ_TYPE_LEVEL_LOW:
+                polarity &= ~mask;
+                type &= ~mask;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        cp_intc_write(polarity, CP_INTC_SYS_POLARITY(reg));
+        cp_intc_write(type, CP_INTC_SYS_TYPE(reg));
+
+        return 0;
+}
+
+static struct irq_chip cp_intc_irq_chip = {
+        .name           = "cp_intc",
+        .ack            = cp_intc_ack_irq,
+        .mask           = cp_intc_mask_irq,
+        .unmask         = cp_intc_unmask_irq,
+        .set_type       = cp_intc_set_irq_type,
+};
+
+void __init cp_intc_init(void __iomem *base, unsigned short num_irq,
+                         u8 *irq_prio)
+{
+        unsigned num_reg        = BITS_TO_LONGS(num_irq);
+        int i;
+
+        cp_intc_base = base;
+
+        cp_intc_write(0, CP_INTC_GLOBAL_ENABLE);
+
+        /* Disable all host interrupts */
+        cp_intc_write(0, CP_INTC_HOST_ENABLE(0));
+
+        /* Disable system interrupts */
+        for (i = 0; i < num_reg; i++)
+                cp_intc_write(~0, CP_INTC_SYS_ENABLE_CLR(i));
+
+        /* Set to normal mode, no nesting, no priority hold */
+        cp_intc_write(0, CP_INTC_CTRL);
+        cp_intc_write(0, CP_INTC_HOST_CTRL);
+
+        /* Clear system interrupt status */
+        for (i = 0; i < num_reg; i++)
+                cp_intc_write(~0, CP_INTC_SYS_STAT_CLR(i));
+
+        /* Enable nIRQ (what about nFIQ?) */
+        cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET);
+
+        /*
+         * Priority is determined by host channel: lower channel number has
+         * higher priority i.e. channel 0 has highest priority and channel 31
+         * had the lowest priority.
+         */
+        num_reg = (num_irq + 3) >> 2;   /* 4 channels per register */
+        if (irq_prio) {
+                unsigned j, k;
+                u32 val;
+
+                for (k = i = 0; i < num_reg; i++) {
+                        for (val = j = 0; j < 4; j++, k++) {
+                                val >>= 8;
+                                if (k < num_irq)
+                                        val |= irq_prio[k] << 24;
+                        }
+
+                        cp_intc_write(val, CP_INTC_CHAN_MAP(i));
+                }
+        } else  {
+                /*
+                 * Default everything to channel 15 if priority not specified.
+                 * Note that channel 0-1 are mapped to nFIQ and channels 2-31
+                 * are mapped to nIRQ.
+                 */
+                for (i = 0; i < num_reg; i++)
+                        cp_intc_write(0x0f0f0f0f, CP_INTC_CHAN_MAP(i));
+        }
+
+        /* Set up genirq dispatching for cp_intc */
+        for (i = 0; i < num_irq; i++) {
+                set_irq_chip(i, &cp_intc_irq_chip);
+                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+                set_irq_handler(i, handle_edge_irq);
+        }
+
+        /* Enable global interrupt */
+        cp_intc_write(1, CP_INTC_GLOBAL_ENABLE);
+}
diff --git a/arch/arm/mach-davinci/include/mach/cp_intc.h b/arch/arm/mach-davinci/include/mach/cp_intc.h
new file mode 100644
index 000000000000..c4d27eec8064
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/cp_intc.h
@@ -0,0 +1,57 @@
+/*
+ * TI Common Platform Interrupt Controller (cp_intc) definitions
+ *
+ * Author: Steve Chen <schen@mvista.com>
+ * Copyright (C) 2008-2009, MontaVista Software, Inc. <source@mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+#ifndef __ASM_HARDWARE_CP_INTC_H
+#define __ASM_HARDWARE_CP_INTC_H
+
+#define CP_INTC_REV                     0x00
+#define CP_INTC_CTRL                    0x04
+#define CP_INTC_HOST_CTRL               0x0C
+#define CP_INTC_GLOBAL_ENABLE           0x10
+#define CP_INTC_GLOBAL_NESTING_LEVEL    0x1C
+#define CP_INTC_SYS_STAT_IDX_SET        0x20
+#define CP_INTC_SYS_STAT_IDX_CLR        0x24
+#define CP_INTC_SYS_ENABLE_IDX_SET      0x28
+#define CP_INTC_SYS_ENABLE_IDX_CLR      0x2C
+#define CP_INTC_GLOBAL_WAKEUP_ENABLE    0x30
+#define CP_INTC_HOST_ENABLE_IDX_SET     0x34
+#define CP_INTC_HOST_ENABLE_IDX_CLR     0x38
+#define CP_INTC_PACING_PRESCALE         0x40
+#define CP_INTC_VECTOR_BASE             0x50
+#define CP_INTC_VECTOR_SIZE             0x54
+#define CP_INTC_VECTOR_NULL             0x58
+#define CP_INTC_PRIO_IDX                0x80
+#define CP_INTC_PRIO_VECTOR             0x84
+#define CP_INTC_SECURE_ENABLE           0x90
+#define CP_INTC_SECURE_PRIO_IDX         0x94
+#define CP_INTC_PACING_PARAM(n)         (0x0100 + (n << 4))
+#define CP_INTC_PACING_DEC(n)           (0x0104 + (n << 4))
+#define CP_INTC_PACING_MAP(n)           (0x0108 + (n << 4))
+#define CP_INTC_SYS_RAW_STAT(n)         (0x0200 + (n << 2))
+#define CP_INTC_SYS_STAT_CLR(n)         (0x0280 + (n << 2))
+#define CP_INTC_SYS_ENABLE_SET(n)       (0x0300 + (n << 2))
+#define CP_INTC_SYS_ENABLE_CLR(n)       (0x0380 + (n << 2))
+#define CP_INTC_CHAN_MAP(n)             (0x0400 + (n << 2))
+#define CP_INTC_HOST_MAP(n)             (0x0800 + (n << 2))
+#define CP_INTC_HOST_PRIO_IDX(n)        (0x0900 + (n << 2))
+#define CP_INTC_SYS_POLARITY(n)         (0x0D00 + (n << 2))
+#define CP_INTC_SYS_TYPE(n)             (0x0D80 + (n << 2))
+#define CP_INTC_WAKEUP_ENABLE(n)        (0x0E00 + (n << 2))
+#define CP_INTC_DEBUG_SELECT(n)         (0x0F00 + (n << 2))
+#define CP_INTC_SYS_SECURE_ENABLE(n)    (0x1000 + (n << 2))
+#define CP_INTC_HOST_NESTING_LEVEL(n)   (0x1100 + (n << 2))
+#define CP_INTC_HOST_ENABLE(n)          (0x1500 + (n << 2))
+#define CP_INTC_HOST_PRIO_VECTOR(n)     (0x1600 + (n << 2))
+#define CP_INTC_VECTOR_ADDR(n)          (0x2000 + (n << 2))
+
+void __init cp_intc_init(void __iomem *base, unsigned short num_irq,
+                         u8 *irq_prio);
+
+#endif  /* __ASM_HARDWARE_CP_INTC_H */