2 files changed, 122 insertions, 0 deletions

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 5cb6bd24d8bf..b9fceb72905c 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_IRQCHIP)			+= irqchip.o
 
 obj-$(CONFIG_ARCH_BCM2835)              += irq-bcm2835.o
 obj-$(CONFIG_ARCH_EXYNOS)               += exynos-combiner.o
+obj-$(CONFIG_ARCH_MXS)                  += irq-mxs.o
 obj-$(CONFIG_METAG)                     += irq-metag-ext.o
 obj-$(CONFIG_METAG_PERFCOUNTER_IRQS)    += irq-metag.o
 obj-$(CONFIG_ARCH_SUNXI)                += irq-sunxi.o
diff --git a/drivers/irqchip/irq-mxs.c b/drivers/irqchip/irq-mxs.c
new file mode 100644
index 000000000000..29889bbdcc6d
--- /dev/null
+++ b/drivers/irqchip/irq-mxs.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/stmp_device.h>
+#include <asm/exception.h>
+
+#include "irqchip.h"
+
+#define HW_ICOLL_VECTOR                         0x0000
+#define HW_ICOLL_LEVELACK                       0x0010
+#define HW_ICOLL_CTRL                           0x0020
+#define HW_ICOLL_STAT_OFFSET                    0x0070
+#define HW_ICOLL_INTERRUPTn_SET(n)              (0x0124 + (n) * 0x10)
+#define HW_ICOLL_INTERRUPTn_CLR(n)              (0x0128 + (n) * 0x10)
+#define BM_ICOLL_INTERRUPTn_ENABLE              0x00000004
+#define BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0   0x1
+
+#define ICOLL_NUM_IRQS          128
+
+static void __iomem *icoll_base;
+static struct irq_domain *icoll_domain;
+
+static void icoll_ack_irq(struct irq_data *d)
+{
+        /*
+         * The Interrupt Collector is able to prioritize irqs.
+         * Currently only level 0 is used. So acking can use
+         * BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 unconditionally.
+         */
+        __raw_writel(BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0,
+                        icoll_base + HW_ICOLL_LEVELACK);
+}
+
+static void icoll_mask_irq(struct irq_data *d)
+{
+        __raw_writel(BM_ICOLL_INTERRUPTn_ENABLE,
+                        icoll_base + HW_ICOLL_INTERRUPTn_CLR(d->hwirq));
+}
+
+static void icoll_unmask_irq(struct irq_data *d)
+{
+        __raw_writel(BM_ICOLL_INTERRUPTn_ENABLE,
+                        icoll_base + HW_ICOLL_INTERRUPTn_SET(d->hwirq));
+}
+
+static struct irq_chip mxs_icoll_chip = {
+        .irq_ack = icoll_ack_irq,
+        .irq_mask = icoll_mask_irq,
+        .irq_unmask = icoll_unmask_irq,
+};
+
+asmlinkage void __exception_irq_entry icoll_handle_irq(struct pt_regs *regs)
+{
+        u32 irqnr;
+
+        do {
+                irqnr = __raw_readl(icoll_base + HW_ICOLL_STAT_OFFSET);
+                if (irqnr != 0x7f) {
+                        __raw_writel(irqnr, icoll_base + HW_ICOLL_VECTOR);
+                        irqnr = irq_find_mapping(icoll_domain, irqnr);
+                        handle_IRQ(irqnr, regs);
+                        continue;
+                }
+                break;
+        } while (1);
+}
+
+static int icoll_irq_domain_map(struct irq_domain *d, unsigned int virq,
+                                irq_hw_number_t hw)
+{
+        irq_set_chip_and_handler(virq, &mxs_icoll_chip, handle_level_irq);
+        set_irq_flags(virq, IRQF_VALID);
+
+        return 0;
+}
+
+static struct irq_domain_ops icoll_irq_domain_ops = {
+        .map = icoll_irq_domain_map,
+        .xlate = irq_domain_xlate_onecell,
+};
+
+static void __init icoll_of_init(struct device_node *np,
+                          struct device_node *interrupt_parent)
+{
+        icoll_base = of_iomap(np, 0);
+        WARN_ON(!icoll_base);
+
+        /*
+         * Interrupt Collector reset, which initializes the priority
+         * for each irq to level 0.
+         */
+        stmp_reset_block(icoll_base + HW_ICOLL_CTRL);
+
+        icoll_domain = irq_domain_add_linear(np, ICOLL_NUM_IRQS,
+                                             &icoll_irq_domain_ops, NULL);
+        WARN_ON(!icoll_domain);
+}
+IRQCHIP_DECLARE(mxs, "fsl,icoll", icoll_of_init);