Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / kernel / irq-msc01.c

diff --git a/kernel/arch/mips/kernel/irq-msc01.c b/kernel/arch/mips/kernel/irq-msc01.c
new file mode 100644 (file)
index 0000000..a734b2c
--- /dev/null
+++ b/kernel/arch/mips/kernel/irq-msc01.c
@@ -0,0 +1,159 @@
+/*
+ * 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.
+ *
+ * Copyright (c) 2004 MIPS Inc
+ * Author: chris@mips.com
+ *
+ * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/msc01_ic.h>
+#include <asm/traps.h>
+
+static unsigned long _icctrl_msc;
+#define MSC01_IC_REG_BASE      _icctrl_msc
+
+#define MSCIC_WRITE(reg, data) do { *(volatile u32 *)(reg) = data; } while (0)
+#define MSCIC_READ(reg, data)  do { data = *(volatile u32 *)(reg); } while (0)
+
+static unsigned int irq_base;
+
+/* mask off an interrupt */
+static inline void mask_msc_irq(struct irq_data *d)
+{
+       unsigned int irq = d->irq;
+
+       if (irq < (irq_base + 32))
+               MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
+       else
+               MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
+}
+
+/* unmask an interrupt */
+static inline void unmask_msc_irq(struct irq_data *d)
+{
+       unsigned int irq = d->irq;
+
+       if (irq < (irq_base + 32))
+               MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
+       else
+               MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
+}
+
+/*
+ * Masks and ACKs an IRQ
+ */
+static void level_mask_and_ack_msc_irq(struct irq_data *d)
+{
+       mask_msc_irq(d);
+       if (!cpu_has_veic)
+               MSCIC_WRITE(MSC01_IC_EOI, 0);
+}
+
+/*
+ * Masks and ACKs an IRQ
+ */
+static void edge_mask_and_ack_msc_irq(struct irq_data *d)
+{
+       unsigned int irq = d->irq;
+
+       mask_msc_irq(d);
+       if (!cpu_has_veic)
+               MSCIC_WRITE(MSC01_IC_EOI, 0);
+       else {
+               u32 r;
+               MSCIC_READ(MSC01_IC_SUP+irq*8, r);
+               MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
+               MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
+       }
+}
+
+/*
+ * Interrupt handler for interrupts coming from SOC-it.
+ */
+void ll_msc_irq(void)
+{
+       unsigned int irq;
+
+       /* read the interrupt vector register */
+       MSCIC_READ(MSC01_IC_VEC, irq);
+       if (irq < 64)
+               do_IRQ(irq + irq_base);
+       else {
+               /* Ignore spurious interrupt */
+       }
+}
+
+static void msc_bind_eic_interrupt(int irq, int set)
+{
+       MSCIC_WRITE(MSC01_IC_RAMW,
+                   (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
+}
+
+static struct irq_chip msc_levelirq_type = {
+       .name = "SOC-it-Level",
+       .irq_ack = level_mask_and_ack_msc_irq,
+       .irq_mask = mask_msc_irq,
+       .irq_mask_ack = level_mask_and_ack_msc_irq,
+       .irq_unmask = unmask_msc_irq,
+       .irq_eoi = unmask_msc_irq,
+};
+
+static struct irq_chip msc_edgeirq_type = {
+       .name = "SOC-it-Edge",
+       .irq_ack = edge_mask_and_ack_msc_irq,
+       .irq_mask = mask_msc_irq,
+       .irq_mask_ack = edge_mask_and_ack_msc_irq,
+       .irq_unmask = unmask_msc_irq,
+       .irq_eoi = unmask_msc_irq,
+};
+
+
+void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
+{
+       _icctrl_msc = (unsigned long) ioremap(icubase, 0x40000);
+
+       /* Reset interrupt controller - initialises all registers to 0 */
+       MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
+
+       board_bind_eic_interrupt = &msc_bind_eic_interrupt;
+
+       for (; nirq > 0; nirq--, imp++) {
+               int n = imp->im_irq;
+
+               switch (imp->im_type) {
+               case MSC01_IRQ_EDGE:
+                       irq_set_chip_and_handler_name(irqbase + n,
+                                                     &msc_edgeirq_type,
+                                                     handle_edge_irq,
+                                                     "edge");
+                       if (cpu_has_veic)
+                               MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
+                       else
+                               MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
+                       break;
+               case MSC01_IRQ_LEVEL:
+                       irq_set_chip_and_handler_name(irqbase + n,
+                                                     &msc_levelirq_type,
+                                                     handle_level_irq,
+                                                     "level");
+                       if (cpu_has_veic)
+                               MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
+                       else
+                               MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
+               }
+       }
+
+       irq_base = irqbase;
+
+       MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT);     /* Enable interrupt generation */
+
+}