1 files changed, 410 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip22/ip22-int.c b/arch/mips/sgi-ip22/ip22-int.c
new file mode 100644
index 0000000..ea2844d
--- /dev/null
+++ b/arch/mips/sgi-ip22/ip22-int.c
@@ -0,0 +1,410 @@
+/*
+ * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
+ *             found on INDY and Indigo2 workstations.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
+ * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
+ *                    - Indigo2 changes
+ *                    - Interrupt handling fixes
+ * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+
+#include <asm/sgi/ioc.h>
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+
+/* #define DEBUG_SGINT */
+
+/* So far nothing hangs here */
+#undef USE_LIO3_IRQ 
+
+struct sgint_regs *sgint;
+
+static char lc0msk_to_irqnr[256];
+static char lc1msk_to_irqnr[256];
+static char lc2msk_to_irqnr[256];
+static char lc3msk_to_irqnr[256];
+
+extern asmlinkage void indyIRQ(void);
+extern int ip22_eisa_init(void);
+
+static void enable_local0_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	/* don't allow mappable interrupt to be enabled from setup_irq,
+	 * we have our own way to do so */
+	if (irq != SGI_MAP_0_IRQ)
+		sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
+	local_irq_restore(flags);
+}
+
+static unsigned int startup_local0_irq(unsigned int irq)
+{
+	enable_local0_irq(irq);
+	return 0;		/* Never anything pending  */
+}
+
+static void disable_local0_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
+	local_irq_restore(flags);
+}
+
+#define shutdown_local0_irq	disable_local0_irq
+#define mask_and_ack_local0_irq	disable_local0_irq
+
+static void end_local0_irq (unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_local0_irq(irq);
+}
+
+static struct hw_interrupt_type ip22_local0_irq_type = {
+	.typename	= "IP22 local 0",
+	.startup	= startup_local0_irq,
+	.shutdown	= shutdown_local0_irq,
+	.enable		= enable_local0_irq,
+	.disable	= disable_local0_irq,
+	.ack		= mask_and_ack_local0_irq,
+	.end		= end_local0_irq,
+};
+
+static void enable_local1_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	/* don't allow mappable interrupt to be enabled from setup_irq,
+	 * we have our own way to do so */
+	if (irq != SGI_MAP_1_IRQ)
+		sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
+	local_irq_restore(flags);
+}
+
+static unsigned int startup_local1_irq(unsigned int irq)
+{
+	enable_local1_irq(irq);
+	return 0;		/* Never anything pending  */
+}
+
+void disable_local1_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
+	local_irq_restore(flags);
+}
+
+#define shutdown_local1_irq	disable_local1_irq
+#define mask_and_ack_local1_irq	disable_local1_irq
+
+static void end_local1_irq (unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_local1_irq(irq);
+}
+
+static struct hw_interrupt_type ip22_local1_irq_type = {
+	.typename	= "IP22 local 1",
+	.startup	= startup_local1_irq,
+	.shutdown	= shutdown_local1_irq,
+	.enable		= enable_local1_irq,
+	.disable	= disable_local1_irq,
+	.ack		= mask_and_ack_local1_irq,
+	.end		= end_local1_irq,
+};
+
+static void enable_local2_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
+	sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
+	local_irq_restore(flags);
+}
+
+static unsigned int startup_local2_irq(unsigned int irq)
+{
+	enable_local2_irq(irq);
+	return 0;		/* Never anything pending  */
+}
+
+void disable_local2_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
+	if (!sgint->cmeimask0)
+		sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
+	local_irq_restore(flags);
+}
+
+#define shutdown_local2_irq disable_local2_irq
+#define mask_and_ack_local2_irq	disable_local2_irq
+
+static void end_local2_irq (unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_local2_irq(irq);
+}
+
+static struct hw_interrupt_type ip22_local2_irq_type = {
+	.typename	= "IP22 local 2",
+	.startup	= startup_local2_irq,
+	.shutdown	= shutdown_local2_irq,
+	.enable		= enable_local2_irq,
+	.disable	= disable_local2_irq,
+	.ack		= mask_and_ack_local2_irq,
+	.end		= end_local2_irq,
+};
+
+static void enable_local3_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
+	sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
+	local_irq_restore(flags);
+}
+
+static unsigned int startup_local3_irq(unsigned int irq)
+{
+	enable_local3_irq(irq);
+	return 0;		/* Never anything pending  */
+}
+
+void disable_local3_irq(unsigned int irq)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
+	if (!sgint->cmeimask1)
+		sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
+	local_irq_restore(flags);
+}
+
+#define shutdown_local3_irq disable_local3_irq
+#define mask_and_ack_local3_irq	disable_local3_irq
+
+static void end_local3_irq (unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_local3_irq(irq);
+}
+
+static struct hw_interrupt_type ip22_local3_irq_type = {
+	.typename	= "IP22 local 3",
+	.startup	= startup_local3_irq,
+	.shutdown	= shutdown_local3_irq,
+	.enable		= enable_local3_irq,
+	.disable	= disable_local3_irq,
+	.ack		= mask_and_ack_local3_irq,
+	.end		= end_local3_irq,
+};
+
+void indy_local0_irqdispatch(struct pt_regs *regs)
+{
+	u8 mask = sgint->istat0 & sgint->imask0;
+	u8 mask2;
+	int irq;
+
+	if (mask & SGINT_ISTAT0_LIO2) {
+		mask2 = sgint->vmeistat & sgint->cmeimask0;
+		irq = lc2msk_to_irqnr[mask2];
+	} else
+		irq = lc0msk_to_irqnr[mask];
+
+	/* if irq == 0, then the interrupt has already been cleared */
+	if (irq)
+		do_IRQ(irq, regs);
+	return;
+}
+
+void indy_local1_irqdispatch(struct pt_regs *regs)
+{
+	u8 mask = sgint->istat1 & sgint->imask1;
+	u8 mask2;
+	int irq;
+
+	if (mask & SGINT_ISTAT1_LIO3) {
+		mask2 = sgint->vmeistat & sgint->cmeimask1;
+		irq = lc3msk_to_irqnr[mask2];
+	} else
+		irq = lc1msk_to_irqnr[mask];
+
+	/* if irq == 0, then the interrupt has already been cleared */
+	if (irq)
+		do_IRQ(irq, regs);
+	return;
+}
+
+extern void ip22_be_interrupt(int irq, struct pt_regs *regs);
+
+void indy_buserror_irq(struct pt_regs *regs)
+{
+	int irq = SGI_BUSERR_IRQ;
+
+	irq_enter();
+	kstat_this_cpu.irqs[irq]++;
+	ip22_be_interrupt(irq, regs);
+	irq_exit();
+}
+
+static struct irqaction local0_cascade = { 
+	.handler	= no_action,
+	.flags		= SA_INTERRUPT,
+	.name		= "local0 cascade",
+};
+
+static struct irqaction local1_cascade = { 
+	.handler	= no_action,
+	.flags		= SA_INTERRUPT,
+	.name		= "local1 cascade",
+};
+
+static struct irqaction buserr = { 
+	.handler	= no_action,
+	.flags		= SA_INTERRUPT,
+	.name		= "Bus Error",
+};
+
+static struct irqaction map0_cascade = { 
+	.handler	= no_action,
+	.flags		= SA_INTERRUPT,
+	.name		= "mapable0 cascade",
+};
+
+#ifdef USE_LIO3_IRQ
+static struct irqaction map1_cascade = { 
+	.handler	= no_action,
+	.flags		= SA_INTERRUPT,
+	.name		= "mapable1 cascade",
+};
+#define SGI_INTERRUPTS	SGINT_END
+#else
+#define SGI_INTERRUPTS	SGINT_LOCAL3
+#endif
+
+extern void mips_cpu_irq_init(unsigned int irq_base);
+
+void __init arch_init_irq(void)
+{
+	int i;
+
+	/* Init local mask --> irq tables. */
+	for (i = 0; i < 256; i++) {
+		if (i & 0x80) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
+		} else if (i & 0x40) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
+		} else if (i & 0x20) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
+		} else if (i & 0x10) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
+		} else if (i & 0x08) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
+		} else if (i & 0x04) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
+		} else if (i & 0x02) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
+		} else if (i & 0x01) {
+			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
+			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
+			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
+			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
+		} else {
+			lc0msk_to_irqnr[i] = 0;
+			lc1msk_to_irqnr[i] = 0;
+			lc2msk_to_irqnr[i] = 0;
+			lc3msk_to_irqnr[i] = 0;
+		}
+	}
+
+	/* Mask out all interrupts. */
+	sgint->imask0 = 0;
+	sgint->imask1 = 0;
+	sgint->cmeimask0 = 0;
+	sgint->cmeimask1 = 0;
+
+	set_except_vector(0, indyIRQ);
+
+	/* init CPU irqs */
+	mips_cpu_irq_init(SGINT_CPU);
+
+	for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
+		hw_irq_controller *handler;
+
+		if (i < SGINT_LOCAL1)
+			handler		= &ip22_local0_irq_type;
+		else if (i < SGINT_LOCAL2)
+			handler		= &ip22_local1_irq_type;
+		else if (i < SGINT_LOCAL3)
+			handler		= &ip22_local2_irq_type;
+		else
+			handler		= &ip22_local3_irq_type;
+
+		irq_desc[i].status	= IRQ_DISABLED;
+		irq_desc[i].action	= 0;
+		irq_desc[i].depth	= 1;
+		irq_desc[i].handler	= handler;
+	}
+
+	/* vector handler. this register the IRQ as non-sharable */
+	setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
+	setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
+	setup_irq(SGI_BUSERR_IRQ, &buserr);
+
+	/* cascade in cascade. i love Indy ;-) */
+	setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
+#ifdef USE_LIO3_IRQ
+	setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
+#endif
+
+#ifdef CONFIG_EISA
+	if (ip22_is_fullhouse())	/* Only Indigo-2 has EISA stuff */
+	        ip22_eisa_init ();
+#endif
+}