microblaze_v8: Interrupt handling and timer support

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 172 insertions, 0 deletions

diff --git a/arch/microblaze/kernel/intc.c b/arch/microblaze/kernel/intc.c
new file mode 100644
index 000000000000..a69d3e3c2fd4
--- /dev/null
+++ b/arch/microblaze/kernel/intc.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2007-2009 PetaLogix
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/page.h>
+#include <linux/io.h>
+
+#include <asm/prom.h>
+#include <asm/irq.h>
+
+#ifdef CONFIG_SELFMOD_INTC
+#include <asm/selfmod.h>
+#define INTC_BASE       BARRIER_BASE_ADDR
+#else
+static unsigned int intc_baseaddr;
+#define INTC_BASE       intc_baseaddr
+#endif
+
+unsigned int nr_irq;
+
+/* No one else should require these constants, so define them locally here. */
+#define ISR 0x00                        /* Interrupt Status Register */
+#define IPR 0x04                        /* Interrupt Pending Register */
+#define IER 0x08                        /* Interrupt Enable Register */
+#define IAR 0x0c                        /* Interrupt Acknowledge Register */
+#define SIE 0x10                        /* Set Interrupt Enable bits */
+#define CIE 0x14                        /* Clear Interrupt Enable bits */
+#define IVR 0x18                        /* Interrupt Vector Register */
+#define MER 0x1c                        /* Master Enable Register */
+
+#define MER_ME (1<<0)
+#define MER_HIE (1<<1)
+
+static void intc_enable_or_unmask(unsigned int irq)
+{
+        pr_debug("enable_or_unmask: %d\n", irq);
+        out_be32(INTC_BASE + SIE, 1 << irq);
+}
+
+static void intc_disable_or_mask(unsigned int irq)
+{
+        pr_debug("disable: %d\n", irq);
+        out_be32(INTC_BASE + CIE, 1 << irq);
+}
+
+static void intc_ack(unsigned int irq)
+{
+        pr_debug("ack: %d\n", irq);
+        out_be32(INTC_BASE + IAR, 1 << irq);
+}
+
+static void intc_mask_ack(unsigned int irq)
+{
+        unsigned long mask = 1 << irq;
+        pr_debug("disable_and_ack: %d\n", irq);
+        out_be32(INTC_BASE + CIE, mask);
+        out_be32(INTC_BASE + IAR, mask);
+}
+
+static void intc_end(unsigned int irq)
+{
+        unsigned long mask = 1 << irq;
+        pr_debug("end: %d\n", irq);
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+                out_be32(INTC_BASE + SIE, mask);
+                /* ack level sensitive intr */
+                if (irq_desc[irq].status & IRQ_LEVEL)
+                        out_be32(INTC_BASE + IAR, mask);
+        }
+}
+
+static struct irq_chip intc_dev = {
+        .name = "Xilinx INTC",
+        .unmask = intc_enable_or_unmask,
+        .mask = intc_disable_or_mask,
+        .ack = intc_ack,
+        .mask_ack = intc_mask_ack,
+        .end = intc_end,
+};
+
+unsigned int get_irq(struct pt_regs *regs)
+{
+        int irq;
+
+        /*
+         * NOTE: This function is the one that needs to be improved in
+         * order to handle multiple interrupt controllers. It currently
+         * is hardcoded to check for interrupts only on the first INTC.
+         */
+        irq = in_be32(INTC_BASE + IVR);
+        pr_debug("get_irq: %d\n", irq);
+
+        return irq;
+}
+
+void __init init_IRQ(void)
+{
+        u32 i, j, intr_type;
+        struct device_node *intc = NULL;
+#ifdef CONFIG_SELFMOD_INTC
+        unsigned int intc_baseaddr = 0;
+        static int arr_func[] = {
+                                (int)&get_irq,
+                                (int)&intc_enable_or_unmask,
+                                (int)&intc_disable_or_mask,
+                                (int)&intc_mask_ack,
+                                (int)&intc_ack,
+                                (int)&intc_end,
+                                0
+                        };
+#endif
+        static char *intc_list[] = {
+                                "xlnx,xps-intc-1.00.a",
+                                "xlnx,opb-intc-1.00.c",
+                                "xlnx,opb-intc-1.00.b",
+                                "xlnx,opb-intc-1.00.a",
+                                NULL
+                        };
+
+        for (j = 0; intc_list[j] != NULL; j++) {
+                intc = of_find_compatible_node(NULL, NULL, intc_list[j]);
+                if (intc)
+                        break;
+        }
+
+        intc_baseaddr = *(int *) of_get_property(intc, "reg", NULL);
+        intc_baseaddr = (unsigned long) ioremap(intc_baseaddr, PAGE_SIZE);
+        nr_irq = *(int *) of_get_property(intc, "xlnx,num-intr-inputs", NULL);
+
+        intr_type =
+                *(int *) of_get_property(intc, "xlnx,kind-of-intr", NULL);
+        if (intr_type >= (1 << nr_irq))
+                printk(KERN_INFO " ERROR: Mishmash in king-of-intr param\n");
+
+#ifdef CONFIG_SELFMOD_INTC
+        selfmod_function((int *) arr_func, intc_baseaddr);
+#endif
+        printk(KERN_INFO "%s #0 at 0x%08x, num_irq=%d, edge=0x%x\n",
+                intc_list[j], intc_baseaddr, nr_irq, intr_type);
+
+        /*
+         * Disable all external interrupts until they are
+         * explicity requested.
+         */
+        out_be32(intc_baseaddr + IER, 0);
+
+        /* Acknowledge any pending interrupts just in case. */
+        out_be32(intc_baseaddr + IAR, 0xffffffff);
+
+        /* Turn on the Master Enable. */
+        out_be32(intc_baseaddr + MER, MER_HIE | MER_ME);
+
+        for (i = 0; i < nr_irq; ++i) {
+                if (intr_type & (0x00000001 << i)) {
+                        set_irq_chip_and_handler_name(i, &intc_dev,
+                                handle_edge_irq, intc_dev.name);
+                        irq_desc[i].status &= ~IRQ_LEVEL;
+                } else {
+                        set_irq_chip_and_handler_name(i, &intc_dev,
+                                handle_level_irq, intc_dev.name);
+                        irq_desc[i].status |= IRQ_LEVEL;
+                }
+        }
+}