Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 784 insertions, 0 deletions

diff --git a/arch/mips/dec/setup.c b/arch/mips/dec/setup.c
new file mode 100644
index 0000000000..6c3704f51d
--- /dev/null
+++ b/arch/mips/dec/setup.c
@@ -0,0 +1,784 @@
+/*
+ * System-specific setup, especially interrupts.
+ *
+ * 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.
+ *
+ * Copyright (C) 1998 Harald Koerfgen
+ * Copyright (C) 2000, 2001, 2002, 2003, 2005, 2020  Maciej W. Rozycki
+ */
+#include <linux/console.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/irqnr.h>
+#include <linux/memblock.h>
+#include <linux/param.h>
+#include <linux/percpu-defs.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pm.h>
+
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+#include <asm/cpu-type.h>
+#include <asm/irq.h>
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+#include <asm/reboot.h>
+#include <asm/sections.h>
+#include <asm/time.h>
+#include <asm/traps.h>
+#include <asm/wbflush.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/ioasic_ints.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/kn02ba.h>
+#include <asm/dec/kn02ca.h>
+#include <asm/dec/kn03.h>
+#include <asm/dec/kn230.h>
+#include <asm/dec/system.h>
+
+
+extern void dec_machine_restart(char *command);
+extern void dec_machine_halt(void);
+extern void dec_machine_power_off(void);
+extern irqreturn_t dec_intr_halt(int irq, void *dev_id);
+
+unsigned long dec_kn_slot_base, dec_kn_slot_size;
+
+EXPORT_SYMBOL(dec_kn_slot_base);
+EXPORT_SYMBOL(dec_kn_slot_size);
+
+int dec_tc_bus;
+
+DEFINE_SPINLOCK(ioasic_ssr_lock);
+EXPORT_SYMBOL(ioasic_ssr_lock);
+
+volatile u32 *ioasic_base;
+
+EXPORT_SYMBOL(ioasic_base);
+
+/*
+ * IRQ routing and priority tables.  Priorities are set as follows:
+ *
+ *		KN01	KN230	KN02	KN02-BA	KN02-CA	KN03
+ *
+ * MEMORY	CPU	CPU	CPU	ASIC	CPU	CPU
+ * RTC		CPU	CPU	CPU	ASIC	CPU	CPU
+ * DMA		-	-	-	ASIC	ASIC	ASIC
+ * SERIAL0	CPU	CPU	CSR	ASIC	ASIC	ASIC
+ * SERIAL1	-	-	-	ASIC	-	ASIC
+ * SCSI		CPU	CPU	CSR	ASIC	ASIC	ASIC
+ * ETHERNET	CPU	*	CSR	ASIC	ASIC	ASIC
+ * other	-	-	-	ASIC	-	-
+ * TC2		-	-	CSR	CPU	ASIC	ASIC
+ * TC1		-	-	CSR	CPU	ASIC	ASIC
+ * TC0		-	-	CSR	CPU	ASIC	ASIC
+ * other	-	CPU	-	CPU	ASIC	ASIC
+ * other	-	-	-	-	CPU	CPU
+ *
+ * * -- shared with SCSI
+ */
+
+int dec_interrupt[DEC_NR_INTS] = {
+	[0 ... DEC_NR_INTS - 1] = -1
+};
+
+EXPORT_SYMBOL(dec_interrupt);
+
+int_ptr cpu_mask_nr_tbl[DEC_MAX_CPU_INTS][2] = {
+	{ { .i = ~0 }, { .p = dec_intr_unimplemented } },
+};
+int_ptr asic_mask_nr_tbl[DEC_MAX_ASIC_INTS][2] = {
+	{ { .i = ~0 }, { .p = asic_intr_unimplemented } },
+};
+int cpu_fpu_mask = DEC_CPU_IRQ_MASK(DEC_CPU_INR_FPU);
+int *fpu_kstat_irq;
+
+static irq_handler_t busirq_handler;
+static unsigned int busirq_flags = IRQF_NO_THREAD;
+
+/*
+ * Bus error (DBE/IBE exceptions and bus interrupts) handling setup.
+ */
+static void __init dec_be_init(void)
+{
+	switch (mips_machtype) {
+	case MACH_DS23100:	/* DS2100/DS3100 Pmin/Pmax */
+		mips_set_be_handler(dec_kn01_be_handler);
+		busirq_handler = dec_kn01_be_interrupt;
+		busirq_flags |= IRQF_SHARED;
+		dec_kn01_be_init();
+		break;
+	case MACH_DS5000_1XX:	/* DS5000/1xx 3min */
+	case MACH_DS5000_XX:	/* DS5000/xx Maxine */
+		mips_set_be_handler(dec_kn02xa_be_handler);
+		busirq_handler = dec_kn02xa_be_interrupt;
+		dec_kn02xa_be_init();
+		break;
+	case MACH_DS5000_200:	/* DS5000/200 3max */
+	case MACH_DS5000_2X0:	/* DS5000/240 3max+ */
+	case MACH_DS5900:	/* DS5900 bigmax */
+		mips_set_be_handler(dec_ecc_be_handler);
+		busirq_handler = dec_ecc_be_interrupt;
+		dec_ecc_be_init();
+		break;
+	}
+}
+
+void __init plat_mem_setup(void)
+{
+	board_be_init = dec_be_init;
+
+	wbflush_setup();
+
+	_machine_restart = dec_machine_restart;
+	_machine_halt = dec_machine_halt;
+	pm_power_off = dec_machine_power_off;
+
+	ioport_resource.start = ~0UL;
+	ioport_resource.end = 0UL;
+
+	/* Stay away from the firmware working memory area for now. */
+	memblock_reserve(PHYS_OFFSET, __pa_symbol(&_text) - PHYS_OFFSET);
+}
+
+/*
+ * Machine-specific initialisation for KN01, aka DS2100 (aka Pmin)
+ * or DS3100 (aka Pmax).
+ */
+static int kn01_interrupt[DEC_NR_INTS] __initdata = {
+	[DEC_IRQ_CASCADE]	= -1,
+	[DEC_IRQ_AB_RECV]	= -1,
+	[DEC_IRQ_AB_XMIT]	= -1,
+	[DEC_IRQ_DZ11]		= DEC_CPU_IRQ_NR(KN01_CPU_INR_DZ11),
+	[DEC_IRQ_ASC]		= -1,
+	[DEC_IRQ_FLOPPY]	= -1,
+	[DEC_IRQ_FPU]		= DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+	[DEC_IRQ_HALT]		= -1,
+	[DEC_IRQ_ISDN]		= -1,
+	[DEC_IRQ_LANCE]		= DEC_CPU_IRQ_NR(KN01_CPU_INR_LANCE),
+	[DEC_IRQ_BUS]		= DEC_CPU_IRQ_NR(KN01_CPU_INR_BUS),
+	[DEC_IRQ_PSU]		= -1,
+	[DEC_IRQ_RTC]		= DEC_CPU_IRQ_NR(KN01_CPU_INR_RTC),
+	[DEC_IRQ_SCC0]		= -1,
+	[DEC_IRQ_SCC1]		= -1,
+	[DEC_IRQ_SII]		= DEC_CPU_IRQ_NR(KN01_CPU_INR_SII),
+	[DEC_IRQ_TC0]		= -1,
+	[DEC_IRQ_TC1]		= -1,
+	[DEC_IRQ_TC2]		= -1,
+	[DEC_IRQ_TIMER]		= -1,
+	[DEC_IRQ_VIDEO]		= DEC_CPU_IRQ_NR(KN01_CPU_INR_VIDEO),
+	[DEC_IRQ_ASC_MERR]	= -1,
+	[DEC_IRQ_ASC_ERR]	= -1,
+	[DEC_IRQ_ASC_DMA]	= -1,
+	[DEC_IRQ_FLOPPY_ERR]	= -1,
+	[DEC_IRQ_ISDN_ERR]	= -1,
+	[DEC_IRQ_ISDN_RXDMA]	= -1,
+	[DEC_IRQ_ISDN_TXDMA]	= -1,
+	[DEC_IRQ_LANCE_MERR]	= -1,
+	[DEC_IRQ_SCC0A_RXERR]	= -1,
+	[DEC_IRQ_SCC0A_RXDMA]	= -1,
+	[DEC_IRQ_SCC0A_TXERR]	= -1,
+	[DEC_IRQ_SCC0A_TXDMA]	= -1,
+	[DEC_IRQ_AB_RXERR]	= -1,
+	[DEC_IRQ_AB_RXDMA]	= -1,
+	[DEC_IRQ_AB_TXERR]	= -1,
+	[DEC_IRQ_AB_TXDMA]	= -1,
+	[DEC_IRQ_SCC1A_RXERR]	= -1,
+	[DEC_IRQ_SCC1A_RXDMA]	= -1,
+	[DEC_IRQ_SCC1A_TXERR]	= -1,
+	[DEC_IRQ_SCC1A_TXDMA]	= -1,
+};
+
+static int_ptr kn01_cpu_mask_nr_tbl[][2] __initdata = {
+	{ { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_BUS) },
+		{ .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_BUS) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_RTC) },
+		{ .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_RTC) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_DZ11) },
+		{ .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_DZ11) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_SII) },
+		{ .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_SII) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN01_CPU_INR_LANCE) },
+		{ .i = DEC_CPU_IRQ_NR(KN01_CPU_INR_LANCE) } },
+	{ { .i = DEC_CPU_IRQ_ALL },
+		{ .p = cpu_all_int } },
+};
+
+static void __init dec_init_kn01(void)
+{
+	/* IRQ routing. */
+	memcpy(&dec_interrupt, &kn01_interrupt,
+		sizeof(kn01_interrupt));
+
+	/* CPU IRQ priorities. */
+	memcpy(&cpu_mask_nr_tbl, &kn01_cpu_mask_nr_tbl,
+		sizeof(kn01_cpu_mask_nr_tbl));
+
+	mips_cpu_irq_init();
+
+}				/* dec_init_kn01 */
+
+
+/*
+ * Machine-specific initialisation for KN230, aka DS5100, aka MIPSmate.
+ */
+static int kn230_interrupt[DEC_NR_INTS] __initdata = {
+	[DEC_IRQ_CASCADE]	= -1,
+	[DEC_IRQ_AB_RECV]	= -1,
+	[DEC_IRQ_AB_XMIT]	= -1,
+	[DEC_IRQ_DZ11]		= DEC_CPU_IRQ_NR(KN230_CPU_INR_DZ11),
+	[DEC_IRQ_ASC]		= -1,
+	[DEC_IRQ_FLOPPY]	= -1,
+	[DEC_IRQ_FPU]		= DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+	[DEC_IRQ_HALT]		= DEC_CPU_IRQ_NR(KN230_CPU_INR_HALT),
+	[DEC_IRQ_ISDN]		= -1,
+	[DEC_IRQ_LANCE]		= DEC_CPU_IRQ_NR(KN230_CPU_INR_LANCE),
+	[DEC_IRQ_BUS]		= DEC_CPU_IRQ_NR(KN230_CPU_INR_BUS),
+	[DEC_IRQ_PSU]		= -1,
+	[DEC_IRQ_RTC]		= DEC_CPU_IRQ_NR(KN230_CPU_INR_RTC),
+	[DEC_IRQ_SCC0]		= -1,
+	[DEC_IRQ_SCC1]		= -1,
+	[DEC_IRQ_SII]		= DEC_CPU_IRQ_NR(KN230_CPU_INR_SII),
+	[DEC_IRQ_TC0]		= -1,
+	[DEC_IRQ_TC1]		= -1,
+	[DEC_IRQ_TC2]		= -1,
+	[DEC_IRQ_TIMER]		= -1,
+	[DEC_IRQ_VIDEO]		= -1,
+	[DEC_IRQ_ASC_MERR]	= -1,
+	[DEC_IRQ_ASC_ERR]	= -1,
+	[DEC_IRQ_ASC_DMA]	= -1,
+	[DEC_IRQ_FLOPPY_ERR]	= -1,
+	[DEC_IRQ_ISDN_ERR]	= -1,
+	[DEC_IRQ_ISDN_RXDMA]	= -1,
+	[DEC_IRQ_ISDN_TXDMA]	= -1,
+	[DEC_IRQ_LANCE_MERR]	= -1,
+	[DEC_IRQ_SCC0A_RXERR]	= -1,
+	[DEC_IRQ_SCC0A_RXDMA]	= -1,
+	[DEC_IRQ_SCC0A_TXERR]	= -1,
+	[DEC_IRQ_SCC0A_TXDMA]	= -1,
+	[DEC_IRQ_AB_RXERR]	= -1,
+	[DEC_IRQ_AB_RXDMA]	= -1,
+	[DEC_IRQ_AB_TXERR]	= -1,
+	[DEC_IRQ_AB_TXDMA]	= -1,
+	[DEC_IRQ_SCC1A_RXERR]	= -1,
+	[DEC_IRQ_SCC1A_RXDMA]	= -1,
+	[DEC_IRQ_SCC1A_TXERR]	= -1,
+	[DEC_IRQ_SCC1A_TXDMA]	= -1,
+};
+
+static int_ptr kn230_cpu_mask_nr_tbl[][2] __initdata = {
+	{ { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_BUS) },
+		{ .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_BUS) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_RTC) },
+		{ .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_RTC) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_DZ11) },
+		{ .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_DZ11) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN230_CPU_INR_SII) },
+		{ .i = DEC_CPU_IRQ_NR(KN230_CPU_INR_SII) } },
+	{ { .i = DEC_CPU_IRQ_ALL },
+		{ .p = cpu_all_int } },
+};
+
+static void __init dec_init_kn230(void)
+{
+	/* IRQ routing. */
+	memcpy(&dec_interrupt, &kn230_interrupt,
+		sizeof(kn230_interrupt));
+
+	/* CPU IRQ priorities. */
+	memcpy(&cpu_mask_nr_tbl, &kn230_cpu_mask_nr_tbl,
+		sizeof(kn230_cpu_mask_nr_tbl));
+
+	mips_cpu_irq_init();
+
+}				/* dec_init_kn230 */
+
+
+/*
+ * Machine-specific initialisation for KN02, aka DS5000/200, aka 3max.
+ */
+static int kn02_interrupt[DEC_NR_INTS] __initdata = {
+	[DEC_IRQ_CASCADE]	= DEC_CPU_IRQ_NR(KN02_CPU_INR_CASCADE),
+	[DEC_IRQ_AB_RECV]	= -1,
+	[DEC_IRQ_AB_XMIT]	= -1,
+	[DEC_IRQ_DZ11]		= KN02_IRQ_NR(KN02_CSR_INR_DZ11),
+	[DEC_IRQ_ASC]		= KN02_IRQ_NR(KN02_CSR_INR_ASC),
+	[DEC_IRQ_FLOPPY]	= -1,
+	[DEC_IRQ_FPU]		= DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+	[DEC_IRQ_HALT]		= -1,
+	[DEC_IRQ_ISDN]		= -1,
+	[DEC_IRQ_LANCE]		= KN02_IRQ_NR(KN02_CSR_INR_LANCE),
+	[DEC_IRQ_BUS]		= DEC_CPU_IRQ_NR(KN02_CPU_INR_BUS),
+	[DEC_IRQ_PSU]		= -1,
+	[DEC_IRQ_RTC]		= DEC_CPU_IRQ_NR(KN02_CPU_INR_RTC),
+	[DEC_IRQ_SCC0]		= -1,
+	[DEC_IRQ_SCC1]		= -1,
+	[DEC_IRQ_SII]		= -1,
+	[DEC_IRQ_TC0]		= KN02_IRQ_NR(KN02_CSR_INR_TC0),
+	[DEC_IRQ_TC1]		= KN02_IRQ_NR(KN02_CSR_INR_TC1),
+	[DEC_IRQ_TC2]		= KN02_IRQ_NR(KN02_CSR_INR_TC2),
+	[DEC_IRQ_TIMER]		= -1,
+	[DEC_IRQ_VIDEO]		= -1,
+	[DEC_IRQ_ASC_MERR]	= -1,
+	[DEC_IRQ_ASC_ERR]	= -1,
+	[DEC_IRQ_ASC_DMA]	= -1,
+	[DEC_IRQ_FLOPPY_ERR]	= -1,
+	[DEC_IRQ_ISDN_ERR]	= -1,
+	[DEC_IRQ_ISDN_RXDMA]	= -1,
+	[DEC_IRQ_ISDN_TXDMA]	= -1,
+	[DEC_IRQ_LANCE_MERR]	= -1,
+	[DEC_IRQ_SCC0A_RXERR]	= -1,
+	[DEC_IRQ_SCC0A_RXDMA]	= -1,
+	[DEC_IRQ_SCC0A_TXERR]	= -1,
+	[DEC_IRQ_SCC0A_TXDMA]	= -1,
+	[DEC_IRQ_AB_RXERR]	= -1,
+	[DEC_IRQ_AB_RXDMA]	= -1,
+	[DEC_IRQ_AB_TXERR]	= -1,
+	[DEC_IRQ_AB_TXDMA]	= -1,
+	[DEC_IRQ_SCC1A_RXERR]	= -1,
+	[DEC_IRQ_SCC1A_RXDMA]	= -1,
+	[DEC_IRQ_SCC1A_TXERR]	= -1,
+	[DEC_IRQ_SCC1A_TXDMA]	= -1,
+};
+
+static int_ptr kn02_cpu_mask_nr_tbl[][2] __initdata = {
+	{ { .i = DEC_CPU_IRQ_MASK(KN02_CPU_INR_BUS) },
+		{ .i = DEC_CPU_IRQ_NR(KN02_CPU_INR_BUS) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02_CPU_INR_RTC) },
+		{ .i = DEC_CPU_IRQ_NR(KN02_CPU_INR_RTC) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02_CPU_INR_CASCADE) },
+		{ .p = kn02_io_int } },
+	{ { .i = DEC_CPU_IRQ_ALL },
+		{ .p = cpu_all_int } },
+};
+
+static int_ptr kn02_asic_mask_nr_tbl[][2] __initdata = {
+	{ { .i = KN02_IRQ_MASK(KN02_CSR_INR_DZ11) },
+		{ .i = KN02_IRQ_NR(KN02_CSR_INR_DZ11) } },
+	{ { .i = KN02_IRQ_MASK(KN02_CSR_INR_ASC) },
+		{ .i = KN02_IRQ_NR(KN02_CSR_INR_ASC) } },
+	{ { .i = KN02_IRQ_MASK(KN02_CSR_INR_LANCE) },
+		{ .i = KN02_IRQ_NR(KN02_CSR_INR_LANCE) } },
+	{ { .i = KN02_IRQ_MASK(KN02_CSR_INR_TC2) },
+		{ .i = KN02_IRQ_NR(KN02_CSR_INR_TC2) } },
+	{ { .i = KN02_IRQ_MASK(KN02_CSR_INR_TC1) },
+		{ .i = KN02_IRQ_NR(KN02_CSR_INR_TC1) } },
+	{ { .i = KN02_IRQ_MASK(KN02_CSR_INR_TC0) },
+		{ .i = KN02_IRQ_NR(KN02_CSR_INR_TC0) } },
+	{ { .i = KN02_IRQ_ALL },
+		{ .p = kn02_all_int } },
+};
+
+static void __init dec_init_kn02(void)
+{
+	/* IRQ routing. */
+	memcpy(&dec_interrupt, &kn02_interrupt,
+		sizeof(kn02_interrupt));
+
+	/* CPU IRQ priorities. */
+	memcpy(&cpu_mask_nr_tbl, &kn02_cpu_mask_nr_tbl,
+		sizeof(kn02_cpu_mask_nr_tbl));
+
+	/* KN02 CSR IRQ priorities. */
+	memcpy(&asic_mask_nr_tbl, &kn02_asic_mask_nr_tbl,
+		sizeof(kn02_asic_mask_nr_tbl));
+
+	mips_cpu_irq_init();
+	init_kn02_irqs(KN02_IRQ_BASE);
+
+}				/* dec_init_kn02 */
+
+
+/*
+ * Machine-specific initialisation for KN02-BA, aka DS5000/1xx
+ * (xx = 20, 25, 33), aka 3min.  Also applies to KN04(-BA), aka
+ * DS5000/150, aka 4min.
+ */
+static int kn02ba_interrupt[DEC_NR_INTS] __initdata = {
+	[DEC_IRQ_CASCADE]	= DEC_CPU_IRQ_NR(KN02BA_CPU_INR_CASCADE),
+	[DEC_IRQ_AB_RECV]	= -1,
+	[DEC_IRQ_AB_XMIT]	= -1,
+	[DEC_IRQ_DZ11]		= -1,
+	[DEC_IRQ_ASC]		= IO_IRQ_NR(KN02BA_IO_INR_ASC),
+	[DEC_IRQ_FLOPPY]	= -1,
+	[DEC_IRQ_FPU]		= DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+	[DEC_IRQ_HALT]		= DEC_CPU_IRQ_NR(KN02BA_CPU_INR_HALT),
+	[DEC_IRQ_ISDN]		= -1,
+	[DEC_IRQ_LANCE]		= IO_IRQ_NR(KN02BA_IO_INR_LANCE),
+	[DEC_IRQ_BUS]		= IO_IRQ_NR(KN02BA_IO_INR_BUS),
+	[DEC_IRQ_PSU]		= IO_IRQ_NR(KN02BA_IO_INR_PSU),
+	[DEC_IRQ_RTC]		= IO_IRQ_NR(KN02BA_IO_INR_RTC),
+	[DEC_IRQ_SCC0]		= IO_IRQ_NR(KN02BA_IO_INR_SCC0),
+	[DEC_IRQ_SCC1]		= IO_IRQ_NR(KN02BA_IO_INR_SCC1),
+	[DEC_IRQ_SII]		= -1,
+	[DEC_IRQ_TC0]		= DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC0),
+	[DEC_IRQ_TC1]		= DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC1),
+	[DEC_IRQ_TC2]		= DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC2),
+	[DEC_IRQ_TIMER]		= -1,
+	[DEC_IRQ_VIDEO]		= -1,
+	[DEC_IRQ_ASC_MERR]	= IO_IRQ_NR(IO_INR_ASC_MERR),
+	[DEC_IRQ_ASC_ERR]	= IO_IRQ_NR(IO_INR_ASC_ERR),
+	[DEC_IRQ_ASC_DMA]	= IO_IRQ_NR(IO_INR_ASC_DMA),
+	[DEC_IRQ_FLOPPY_ERR]	= -1,
+	[DEC_IRQ_ISDN_ERR]	= -1,
+	[DEC_IRQ_ISDN_RXDMA]	= -1,
+	[DEC_IRQ_ISDN_TXDMA]	= -1,
+	[DEC_IRQ_LANCE_MERR]	= IO_IRQ_NR(IO_INR_LANCE_MERR),
+	[DEC_IRQ_SCC0A_RXERR]	= IO_IRQ_NR(IO_INR_SCC0A_RXERR),
+	[DEC_IRQ_SCC0A_RXDMA]	= IO_IRQ_NR(IO_INR_SCC0A_RXDMA),
+	[DEC_IRQ_SCC0A_TXERR]	= IO_IRQ_NR(IO_INR_SCC0A_TXERR),
+	[DEC_IRQ_SCC0A_TXDMA]	= IO_IRQ_NR(IO_INR_SCC0A_TXDMA),
+	[DEC_IRQ_AB_RXERR]	= -1,
+	[DEC_IRQ_AB_RXDMA]	= -1,
+	[DEC_IRQ_AB_TXERR]	= -1,
+	[DEC_IRQ_AB_TXDMA]	= -1,
+	[DEC_IRQ_SCC1A_RXERR]	= IO_IRQ_NR(IO_INR_SCC1A_RXERR),
+	[DEC_IRQ_SCC1A_RXDMA]	= IO_IRQ_NR(IO_INR_SCC1A_RXDMA),
+	[DEC_IRQ_SCC1A_TXERR]	= IO_IRQ_NR(IO_INR_SCC1A_TXERR),
+	[DEC_IRQ_SCC1A_TXDMA]	= IO_IRQ_NR(IO_INR_SCC1A_TXDMA),
+};
+
+static int_ptr kn02ba_cpu_mask_nr_tbl[][2] __initdata = {
+	{ { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_CASCADE) },
+		{ .p = kn02xa_io_int } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_TC2) },
+		{ .i = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC2) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_TC1) },
+		{ .i = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC1) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02BA_CPU_INR_TC0) },
+		{ .i = DEC_CPU_IRQ_NR(KN02BA_CPU_INR_TC0) } },
+	{ { .i = DEC_CPU_IRQ_ALL },
+		{ .p = cpu_all_int } },
+};
+
+static int_ptr kn02ba_asic_mask_nr_tbl[][2] __initdata = {
+	{ { .i = IO_IRQ_MASK(KN02BA_IO_INR_BUS) },
+		{ .i = IO_IRQ_NR(KN02BA_IO_INR_BUS) } },
+	{ { .i = IO_IRQ_MASK(KN02BA_IO_INR_RTC) },
+		{ .i = IO_IRQ_NR(KN02BA_IO_INR_RTC) } },
+	{ { .i = IO_IRQ_DMA },
+		{ .p = asic_dma_int } },
+	{ { .i = IO_IRQ_MASK(KN02BA_IO_INR_SCC0) },
+		{ .i = IO_IRQ_NR(KN02BA_IO_INR_SCC0) } },
+	{ { .i = IO_IRQ_MASK(KN02BA_IO_INR_SCC1) },
+		{ .i = IO_IRQ_NR(KN02BA_IO_INR_SCC1) } },
+	{ { .i = IO_IRQ_MASK(KN02BA_IO_INR_ASC) },
+		{ .i = IO_IRQ_NR(KN02BA_IO_INR_ASC) } },
+	{ { .i = IO_IRQ_MASK(KN02BA_IO_INR_LANCE) },
+		{ .i = IO_IRQ_NR(KN02BA_IO_INR_LANCE) } },
+	{ { .i = IO_IRQ_ALL },
+		{ .p = asic_all_int } },
+};
+
+static void __init dec_init_kn02ba(void)
+{
+	/* IRQ routing. */
+	memcpy(&dec_interrupt, &kn02ba_interrupt,
+		sizeof(kn02ba_interrupt));
+
+	/* CPU IRQ priorities. */
+	memcpy(&cpu_mask_nr_tbl, &kn02ba_cpu_mask_nr_tbl,
+		sizeof(kn02ba_cpu_mask_nr_tbl));
+
+	/* I/O ASIC IRQ priorities. */
+	memcpy(&asic_mask_nr_tbl, &kn02ba_asic_mask_nr_tbl,
+		sizeof(kn02ba_asic_mask_nr_tbl));
+
+	mips_cpu_irq_init();
+	init_ioasic_irqs(IO_IRQ_BASE);
+
+}				/* dec_init_kn02ba */
+
+
+/*
+ * Machine-specific initialisation for KN02-CA, aka DS5000/xx,
+ * (xx = 20, 25, 33), aka MAXine.  Also applies to KN04(-CA), aka
+ * DS5000/50, aka 4MAXine.
+ */
+static int kn02ca_interrupt[DEC_NR_INTS] __initdata = {
+	[DEC_IRQ_CASCADE]	= DEC_CPU_IRQ_NR(KN02CA_CPU_INR_CASCADE),
+	[DEC_IRQ_AB_RECV]	= IO_IRQ_NR(KN02CA_IO_INR_AB_RECV),
+	[DEC_IRQ_AB_XMIT]	= IO_IRQ_NR(KN02CA_IO_INR_AB_XMIT),
+	[DEC_IRQ_DZ11]		= -1,
+	[DEC_IRQ_ASC]		= IO_IRQ_NR(KN02CA_IO_INR_ASC),
+	[DEC_IRQ_FLOPPY]	= IO_IRQ_NR(KN02CA_IO_INR_FLOPPY),
+	[DEC_IRQ_FPU]		= DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+	[DEC_IRQ_HALT]		= DEC_CPU_IRQ_NR(KN02CA_CPU_INR_HALT),
+	[DEC_IRQ_ISDN]		= IO_IRQ_NR(KN02CA_IO_INR_ISDN),
+	[DEC_IRQ_LANCE]		= IO_IRQ_NR(KN02CA_IO_INR_LANCE),
+	[DEC_IRQ_BUS]		= DEC_CPU_IRQ_NR(KN02CA_CPU_INR_BUS),
+	[DEC_IRQ_PSU]		= -1,
+	[DEC_IRQ_RTC]		= DEC_CPU_IRQ_NR(KN02CA_CPU_INR_RTC),
+	[DEC_IRQ_SCC0]		= IO_IRQ_NR(KN02CA_IO_INR_SCC0),
+	[DEC_IRQ_SCC1]		= -1,
+	[DEC_IRQ_SII]		= -1,
+	[DEC_IRQ_TC0]		= IO_IRQ_NR(KN02CA_IO_INR_TC0),
+	[DEC_IRQ_TC1]		= IO_IRQ_NR(KN02CA_IO_INR_TC1),
+	[DEC_IRQ_TC2]		= -1,
+	[DEC_IRQ_TIMER]		= DEC_CPU_IRQ_NR(KN02CA_CPU_INR_TIMER),
+	[DEC_IRQ_VIDEO]		= IO_IRQ_NR(KN02CA_IO_INR_VIDEO),
+	[DEC_IRQ_ASC_MERR]	= IO_IRQ_NR(IO_INR_ASC_MERR),
+	[DEC_IRQ_ASC_ERR]	= IO_IRQ_NR(IO_INR_ASC_ERR),
+	[DEC_IRQ_ASC_DMA]	= IO_IRQ_NR(IO_INR_ASC_DMA),
+	[DEC_IRQ_FLOPPY_ERR]	= IO_IRQ_NR(IO_INR_FLOPPY_ERR),
+	[DEC_IRQ_ISDN_ERR]	= IO_IRQ_NR(IO_INR_ISDN_ERR),
+	[DEC_IRQ_ISDN_RXDMA]	= IO_IRQ_NR(IO_INR_ISDN_RXDMA),
+	[DEC_IRQ_ISDN_TXDMA]	= IO_IRQ_NR(IO_INR_ISDN_TXDMA),
+	[DEC_IRQ_LANCE_MERR]	= IO_IRQ_NR(IO_INR_LANCE_MERR),
+	[DEC_IRQ_SCC0A_RXERR]	= IO_IRQ_NR(IO_INR_SCC0A_RXERR),
+	[DEC_IRQ_SCC0A_RXDMA]	= IO_IRQ_NR(IO_INR_SCC0A_RXDMA),
+	[DEC_IRQ_SCC0A_TXERR]	= IO_IRQ_NR(IO_INR_SCC0A_TXERR),
+	[DEC_IRQ_SCC0A_TXDMA]	= IO_IRQ_NR(IO_INR_SCC0A_TXDMA),
+	[DEC_IRQ_AB_RXERR]	= IO_IRQ_NR(IO_INR_AB_RXERR),
+	[DEC_IRQ_AB_RXDMA]	= IO_IRQ_NR(IO_INR_AB_RXDMA),
+	[DEC_IRQ_AB_TXERR]	= IO_IRQ_NR(IO_INR_AB_TXERR),
+	[DEC_IRQ_AB_TXDMA]	= IO_IRQ_NR(IO_INR_AB_TXDMA),
+	[DEC_IRQ_SCC1A_RXERR]	= -1,
+	[DEC_IRQ_SCC1A_RXDMA]	= -1,
+	[DEC_IRQ_SCC1A_TXERR]	= -1,
+	[DEC_IRQ_SCC1A_TXDMA]	= -1,
+};
+
+static int_ptr kn02ca_cpu_mask_nr_tbl[][2] __initdata = {
+	{ { .i = DEC_CPU_IRQ_MASK(KN02CA_CPU_INR_BUS) },
+		{ .i = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_BUS) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02CA_CPU_INR_RTC) },
+		{ .i = DEC_CPU_IRQ_NR(KN02CA_CPU_INR_RTC) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN02CA_CPU_INR_CASCADE) },
+		{ .p = kn02xa_io_int } },
+	{ { .i = DEC_CPU_IRQ_ALL },
+		{ .p = cpu_all_int } },
+};
+
+static int_ptr kn02ca_asic_mask_nr_tbl[][2] __initdata = {
+	{ { .i = IO_IRQ_DMA },
+		{ .p = asic_dma_int } },
+	{ { .i = IO_IRQ_MASK(KN02CA_IO_INR_SCC0) },
+		{ .i = IO_IRQ_NR(KN02CA_IO_INR_SCC0) } },
+	{ { .i = IO_IRQ_MASK(KN02CA_IO_INR_ASC) },
+		{ .i = IO_IRQ_NR(KN02CA_IO_INR_ASC) } },
+	{ { .i = IO_IRQ_MASK(KN02CA_IO_INR_LANCE) },
+		{ .i = IO_IRQ_NR(KN02CA_IO_INR_LANCE) } },
+	{ { .i = IO_IRQ_MASK(KN02CA_IO_INR_TC1) },
+		{ .i = IO_IRQ_NR(KN02CA_IO_INR_TC1) } },
+	{ { .i = IO_IRQ_MASK(KN02CA_IO_INR_TC0) },
+		{ .i = IO_IRQ_NR(KN02CA_IO_INR_TC0) } },
+	{ { .i = IO_IRQ_ALL },
+		{ .p = asic_all_int } },
+};
+
+static void __init dec_init_kn02ca(void)
+{
+	/* IRQ routing. */
+	memcpy(&dec_interrupt, &kn02ca_interrupt,
+		sizeof(kn02ca_interrupt));
+
+	/* CPU IRQ priorities. */
+	memcpy(&cpu_mask_nr_tbl, &kn02ca_cpu_mask_nr_tbl,
+		sizeof(kn02ca_cpu_mask_nr_tbl));
+
+	/* I/O ASIC IRQ priorities. */
+	memcpy(&asic_mask_nr_tbl, &kn02ca_asic_mask_nr_tbl,
+		sizeof(kn02ca_asic_mask_nr_tbl));
+
+	mips_cpu_irq_init();
+	init_ioasic_irqs(IO_IRQ_BASE);
+
+}				/* dec_init_kn02ca */
+
+
+/*
+ * Machine-specific initialisation for KN03, aka DS5000/240,
+ * aka 3max+ and DS5900, aka BIGmax.  Also applies to KN05, aka
+ * DS5000/260, aka 4max+ and DS5900/260.
+ */
+static int kn03_interrupt[DEC_NR_INTS] __initdata = {
+	[DEC_IRQ_CASCADE]	= DEC_CPU_IRQ_NR(KN03_CPU_INR_CASCADE),
+	[DEC_IRQ_AB_RECV]	= -1,
+	[DEC_IRQ_AB_XMIT]	= -1,
+	[DEC_IRQ_DZ11]		= -1,
+	[DEC_IRQ_ASC]		= IO_IRQ_NR(KN03_IO_INR_ASC),
+	[DEC_IRQ_FLOPPY]	= -1,
+	[DEC_IRQ_FPU]		= DEC_CPU_IRQ_NR(DEC_CPU_INR_FPU),
+	[DEC_IRQ_HALT]		= DEC_CPU_IRQ_NR(KN03_CPU_INR_HALT),
+	[DEC_IRQ_ISDN]		= -1,
+	[DEC_IRQ_LANCE]		= IO_IRQ_NR(KN03_IO_INR_LANCE),
+	[DEC_IRQ_BUS]		= DEC_CPU_IRQ_NR(KN03_CPU_INR_BUS),
+	[DEC_IRQ_PSU]		= IO_IRQ_NR(KN03_IO_INR_PSU),
+	[DEC_IRQ_RTC]		= DEC_CPU_IRQ_NR(KN03_CPU_INR_RTC),
+	[DEC_IRQ_SCC0]		= IO_IRQ_NR(KN03_IO_INR_SCC0),
+	[DEC_IRQ_SCC1]		= IO_IRQ_NR(KN03_IO_INR_SCC1),
+	[DEC_IRQ_SII]		= -1,
+	[DEC_IRQ_TC0]		= IO_IRQ_NR(KN03_IO_INR_TC0),
+	[DEC_IRQ_TC1]		= IO_IRQ_NR(KN03_IO_INR_TC1),
+	[DEC_IRQ_TC2]		= IO_IRQ_NR(KN03_IO_INR_TC2),
+	[DEC_IRQ_TIMER]		= -1,
+	[DEC_IRQ_VIDEO]		= -1,
+	[DEC_IRQ_ASC_MERR]	= IO_IRQ_NR(IO_INR_ASC_MERR),
+	[DEC_IRQ_ASC_ERR]	= IO_IRQ_NR(IO_INR_ASC_ERR),
+	[DEC_IRQ_ASC_DMA]	= IO_IRQ_NR(IO_INR_ASC_DMA),
+	[DEC_IRQ_FLOPPY_ERR]	= -1,
+	[DEC_IRQ_ISDN_ERR]	= -1,
+	[DEC_IRQ_ISDN_RXDMA]	= -1,
+	[DEC_IRQ_ISDN_TXDMA]	= -1,
+	[DEC_IRQ_LANCE_MERR]	= IO_IRQ_NR(IO_INR_LANCE_MERR),
+	[DEC_IRQ_SCC0A_RXERR]	= IO_IRQ_NR(IO_INR_SCC0A_RXERR),
+	[DEC_IRQ_SCC0A_RXDMA]	= IO_IRQ_NR(IO_INR_SCC0A_RXDMA),
+	[DEC_IRQ_SCC0A_TXERR]	= IO_IRQ_NR(IO_INR_SCC0A_TXERR),
+	[DEC_IRQ_SCC0A_TXDMA]	= IO_IRQ_NR(IO_INR_SCC0A_TXDMA),
+	[DEC_IRQ_AB_RXERR]	= -1,
+	[DEC_IRQ_AB_RXDMA]	= -1,
+	[DEC_IRQ_AB_TXERR]	= -1,
+	[DEC_IRQ_AB_TXDMA]	= -1,
+	[DEC_IRQ_SCC1A_RXERR]	= IO_IRQ_NR(IO_INR_SCC1A_RXERR),
+	[DEC_IRQ_SCC1A_RXDMA]	= IO_IRQ_NR(IO_INR_SCC1A_RXDMA),
+	[DEC_IRQ_SCC1A_TXERR]	= IO_IRQ_NR(IO_INR_SCC1A_TXERR),
+	[DEC_IRQ_SCC1A_TXDMA]	= IO_IRQ_NR(IO_INR_SCC1A_TXDMA),
+};
+
+static int_ptr kn03_cpu_mask_nr_tbl[][2] __initdata = {
+	{ { .i = DEC_CPU_IRQ_MASK(KN03_CPU_INR_BUS) },
+		{ .i = DEC_CPU_IRQ_NR(KN03_CPU_INR_BUS) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN03_CPU_INR_RTC) },
+		{ .i = DEC_CPU_IRQ_NR(KN03_CPU_INR_RTC) } },
+	{ { .i = DEC_CPU_IRQ_MASK(KN03_CPU_INR_CASCADE) },
+		{ .p = kn03_io_int } },
+	{ { .i = DEC_CPU_IRQ_ALL },
+		{ .p = cpu_all_int } },
+};
+
+static int_ptr kn03_asic_mask_nr_tbl[][2] __initdata = {
+	{ { .i = IO_IRQ_DMA },
+		{ .p = asic_dma_int } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_SCC0) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_SCC0) } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_SCC1) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_SCC1) } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_ASC) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_ASC) } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_LANCE) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_LANCE) } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_TC2) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_TC2) } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_TC1) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_TC1) } },
+	{ { .i = IO_IRQ_MASK(KN03_IO_INR_TC0) },
+		{ .i = IO_IRQ_NR(KN03_IO_INR_TC0) } },
+	{ { .i = IO_IRQ_ALL },
+		{ .p = asic_all_int } },
+};
+
+static void __init dec_init_kn03(void)
+{
+	/* IRQ routing. */
+	memcpy(&dec_interrupt, &kn03_interrupt,
+		sizeof(kn03_interrupt));
+
+	/* CPU IRQ priorities. */
+	memcpy(&cpu_mask_nr_tbl, &kn03_cpu_mask_nr_tbl,
+		sizeof(kn03_cpu_mask_nr_tbl));
+
+	/* I/O ASIC IRQ priorities. */
+	memcpy(&asic_mask_nr_tbl, &kn03_asic_mask_nr_tbl,
+		sizeof(kn03_asic_mask_nr_tbl));
+
+	mips_cpu_irq_init();
+	init_ioasic_irqs(IO_IRQ_BASE);
+
+}				/* dec_init_kn03 */
+
+
+void __init arch_init_irq(void)
+{
+	switch (mips_machtype) {
+	case MACH_DS23100:	/* DS2100/DS3100 Pmin/Pmax */
+		dec_init_kn01();
+		break;
+	case MACH_DS5100:	/* DS5100 MIPSmate */
+		dec_init_kn230();
+		break;
+	case MACH_DS5000_200:	/* DS5000/200 3max */
+		dec_init_kn02();
+		break;
+	case MACH_DS5000_1XX:	/* DS5000/1xx 3min */
+		dec_init_kn02ba();
+		break;
+	case MACH_DS5000_2X0:	/* DS5000/240 3max+ */
+	case MACH_DS5900:	/* DS5900 bigmax */
+		dec_init_kn03();
+		break;
+	case MACH_DS5000_XX:	/* Personal DS5000/xx */
+		dec_init_kn02ca();
+		break;
+	case MACH_DS5800:	/* DS5800 Isis */
+		panic("Don't know how to set this up!");
+		break;
+	case MACH_DS5400:	/* DS5400 MIPSfair */
+		panic("Don't know how to set this up!");
+		break;
+	case MACH_DS5500:	/* DS5500 MIPSfair-2 */
+		panic("Don't know how to set this up!");
+		break;
+	}
+
+	/* Free the FPU interrupt if the exception is present. */
+	if (!cpu_has_nofpuex) {
+		cpu_fpu_mask = 0;
+		dec_interrupt[DEC_IRQ_FPU] = -1;
+	}
+	/* Free the halt interrupt unused on R4k systems.  */
+	if (current_cpu_type() == CPU_R4000SC ||
+	    current_cpu_type() == CPU_R4400SC)
+		dec_interrupt[DEC_IRQ_HALT] = -1;
+
+	/* Register board interrupts: FPU and cascade. */
+	if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT) &&
+	    dec_interrupt[DEC_IRQ_FPU] >= 0 && cpu_has_fpu) {
+		struct irq_desc *desc_fpu;
+		int irq_fpu;
+
+		irq_fpu = dec_interrupt[DEC_IRQ_FPU];
+		if (request_irq(irq_fpu, no_action, IRQF_NO_THREAD, "fpu",
+				NULL))
+			pr_err("Failed to register fpu interrupt\n");
+		desc_fpu = irq_to_desc(irq_fpu);
+		fpu_kstat_irq = this_cpu_ptr(desc_fpu->kstat_irqs);
+	}
+	if (dec_interrupt[DEC_IRQ_CASCADE] >= 0) {
+		if (request_irq(dec_interrupt[DEC_IRQ_CASCADE], no_action,
+				IRQF_NO_THREAD, "cascade", NULL))
+			pr_err("Failed to register cascade interrupt\n");
+	}
+	/* Register the bus error interrupt. */
+	if (dec_interrupt[DEC_IRQ_BUS] >= 0 && busirq_handler) {
+		if (request_irq(dec_interrupt[DEC_IRQ_BUS], busirq_handler,
+				busirq_flags, "bus error", busirq_handler))
+			pr_err("Failed to register bus error interrupt\n");
+	}
+	/* Register the HALT interrupt. */
+	if (dec_interrupt[DEC_IRQ_HALT] >= 0) {
+		if (request_irq(dec_interrupt[DEC_IRQ_HALT], dec_intr_halt,
+				IRQF_NO_THREAD, "halt", NULL))
+			pr_err("Failed to register halt interrupt\n");
+	}
+}
+
+asmlinkage unsigned int dec_irq_dispatch(unsigned int irq)
+{
+	do_IRQ(irq);
+	return 0;
+}