1 files changed, 138 insertions, 0 deletions

diff --git a/arch/arm/mach-mmp/irq-mmp2.c b/arch/arm/mach-mmp/irq-mmp2.c
new file mode 100644
index 000000000000..dcd36f4bc9de
--- /dev/null
+++ b/arch/arm/mach-mmp/irq-mmp2.c
@@ -0,0 +1,138 @@
+/*
+ *  linux/arch/arm/mach-mmp/irq-mmp2.c
+ *
+ *  Generic IRQ handling, GPIO IRQ demultiplexing, etc.
+ *
+ *  Author:     Haojian Zhuang <haojian.zhuang@marvell.com>
+ *  Copyright:  Marvell International Ltd.
+ *
+ *  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/init.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/regs-icu.h>
+
+#include "common.h"
+
+static void icu_mask_irq(unsigned int irq)
+{
+        uint32_t r = __raw_readl(ICU_INT_CONF(irq));
+
+        r &= ~ICU_INT_ROUTE_PJ4_IRQ;
+        __raw_writel(r, ICU_INT_CONF(irq));
+}
+
+static void icu_unmask_irq(unsigned int irq)
+{
+        uint32_t r = __raw_readl(ICU_INT_CONF(irq));
+
+        r |= ICU_INT_ROUTE_PJ4_IRQ;
+        __raw_writel(r, ICU_INT_CONF(irq));
+}
+
+static struct irq_chip icu_irq_chip = {
+        .name           = "icu_irq",
+        .mask_ack       = icu_mask_irq,
+        .unmask         = icu_unmask_irq,
+};
+
+#define SECOND_IRQ_MASK(_name_, irq_base, prefix)                       \
+static void _name_##_mask_irq(unsigned int irq)                         \
+{                                                                       \
+        uint32_t r;                                                     \
+        r = __raw_readl(prefix##_MASK) | (1 << (irq - irq_base));       \
+        __raw_writel(r, prefix##_MASK);                                 \
+}
+
+#define SECOND_IRQ_UNMASK(_name_, irq_base, prefix)                     \
+static void _name_##_unmask_irq(unsigned int irq)                       \
+{                                                                       \
+        uint32_t r;                                                     \
+        r = __raw_readl(prefix##_MASK) & ~(1 << (irq - irq_base));      \
+        __raw_writel(r, prefix##_MASK);                                 \
+}
+
+#define SECOND_IRQ_DEMUX(_name_, irq_base, prefix)                      \
+static void _name_##_irq_demux(unsigned int irq, struct irq_desc *desc) \
+{                                                                       \
+        unsigned long status, mask, n;                                  \
+        mask = __raw_readl(prefix##_MASK);                              \
+        while (1) {                                                     \
+                status = __raw_readl(prefix##_STATUS) & ~mask;          \
+                if (status == 0)                                        \
+                        break;                                          \
+                n = find_first_bit(&status, BITS_PER_LONG);             \
+                while (n < BITS_PER_LONG) {                             \
+                        generic_handle_irq(irq_base + n);               \
+                        n = find_next_bit(&status, BITS_PER_LONG, n+1); \
+                }                                                       \
+        }                                                               \
+}
+
+#define SECOND_IRQ_CHIP(_name_, irq_base, prefix)                       \
+SECOND_IRQ_MASK(_name_, irq_base, prefix)                               \
+SECOND_IRQ_UNMASK(_name_, irq_base, prefix)                             \
+SECOND_IRQ_DEMUX(_name_, irq_base, prefix)                              \
+static struct irq_chip _name_##_irq_chip = {                            \
+        .name           = #_name_,                                      \
+        .mask_ack       = _name_##_mask_irq,                            \
+        .unmask         = _name_##_unmask_irq,                          \
+}
+
+SECOND_IRQ_CHIP(pmic, IRQ_MMP2_PMIC_BASE, MMP2_ICU_INT4);
+SECOND_IRQ_CHIP(rtc,  IRQ_MMP2_RTC_BASE,  MMP2_ICU_INT5);
+SECOND_IRQ_CHIP(twsi, IRQ_MMP2_TWSI_BASE, MMP2_ICU_INT17);
+SECOND_IRQ_CHIP(misc, IRQ_MMP2_MISC_BASE, MMP2_ICU_INT35);
+SECOND_IRQ_CHIP(ssp,  IRQ_MMP2_SSP_BASE,  MMP2_ICU_INT51);
+
+static void init_mux_irq(struct irq_chip *chip, int start, int num)
+{
+        int irq;
+
+        for (irq = start; num > 0; irq++, num--) {
+                chip->mask_ack(irq);
+                set_irq_chip(irq, chip);
+                set_irq_flags(irq, IRQF_VALID);
+                set_irq_handler(irq, handle_level_irq);
+        }
+}
+
+void __init mmp2_init_irq(void)
+{
+        int irq;
+
+        for (irq = 0; irq < IRQ_MMP2_MUX_BASE; irq++) {
+                icu_mask_irq(irq);
+                set_irq_chip(irq, &icu_irq_chip);
+                set_irq_flags(irq, IRQF_VALID);
+
+                switch (irq) {
+                case IRQ_MMP2_PMIC_MUX:
+                case IRQ_MMP2_RTC_MUX:
+                case IRQ_MMP2_TWSI_MUX:
+                case IRQ_MMP2_MISC_MUX:
+                case IRQ_MMP2_SSP_MUX:
+                        break;
+                default:
+                        set_irq_handler(irq, handle_level_irq);
+                        break;
+                }
+        }
+
+        init_mux_irq(&pmic_irq_chip, IRQ_MMP2_PMIC_BASE, 2);
+        init_mux_irq(&rtc_irq_chip, IRQ_MMP2_RTC_BASE, 2);
+        init_mux_irq(&twsi_irq_chip, IRQ_MMP2_TWSI_BASE, 5);
+        init_mux_irq(&misc_irq_chip, IRQ_MMP2_MISC_BASE, 15);
+        init_mux_irq(&ssp_irq_chip, IRQ_MMP2_SSP_BASE, 2);
+
+        set_irq_chained_handler(IRQ_MMP2_PMIC_MUX, pmic_irq_demux);
+        set_irq_chained_handler(IRQ_MMP2_RTC_MUX, rtc_irq_demux);
+        set_irq_chained_handler(IRQ_MMP2_TWSI_MUX, twsi_irq_demux);
+        set_irq_chained_handler(IRQ_MMP2_MISC_MUX, misc_irq_demux);
+        set_irq_chained_handler(IRQ_MMP2_SSP_MUX, ssp_irq_demux);
+}