patch-2.4.20 linux-2.4.20/arch/mips/sgi-ip32/ip32-irq.c

• Lines: 585
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/mips/sgi-ip32/ip32-irq.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/mips/sgi-ip32/ip32-irq.c linux-2.4.20/arch/mips/sgi-ip32/ip32-irq.c
@@ -0,0 +1,584 @@
+/*
+ * Code to handle IP32 IRQs
+ *
+ * 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) 2000 Harald Koerfgen
+ * Copyright (C) 2001 Keith M Wesolowski
+ */
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+
+#include <asm/bitops.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/ip32/ip32_ints.h>
+#include <asm/ip32/crime.h>
+#include <asm/ip32/mace.h>
+#include <asm/signal.h>
+
+#undef DEBUG_IRQ
+#ifdef DEBUG_IRQ
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+/* O2 irq map
+ *
+ * IP0 -> software (ignored)
+ * IP1 -> software (ignored)
+ * IP2 -> (irq0) C crime 1.1 all interrupts; crime 1.5 ???
+ * IP3 -> (irq1) X unknown
+ * IP4 -> (irq2) X unknown
+ * IP5 -> (irq3) X unknown
+ * IP6 -> (irq4) X unknown
+ * IP7 -> (irq5) 0 CPU count/compare timer (system timer)
+ *
+ * crime: (C)
+ *
+ * CRIME_INT_STAT 31:0:
+ *
+ * 0 -> 1 Video in 1
+ * 1 -> 2 Video in 2
+ * 2 -> 3 Video out
+ * 3 -> 4 Mace ethernet
+ * 4 -> S  SuperIO sub-interrupt
+ * 5 -> M  Miscellaneous sub-interrupt
+ * 6 -> A  Audio sub-interrupt
+ * 7 -> 8  PCI bridge errors
+ * 8 -> 9  PCI SCSI aic7xxx 0
+ * 9 -> 10  PCI SCSI aic7xxx 1
+ * 10 -> 11 PCI slot 0
+ * 11 -> 12 unused (PCI slot 1)
+ * 12 -> 13 unused (PCI slot 2)
+ * 13 -> 14 unused (PCI shared 0)
+ * 14 -> 15 unused (PCI shared 1)
+ * 15 -> 16 unused (PCI shared 2)
+ * 16 -> 17 GBE0 (E)
+ * 17 -> 18 GBE1 (E)
+ * 18 -> 19 GBE2 (E)
+ * 19 -> 20 GBE3 (E)
+ * 20 -> 21 CPU errors
+ * 21 -> 22 Memory errors
+ * 22 -> 23 RE empty edge (E)
+ * 23 -> 24 RE full edge (E)
+ * 24 -> 25 RE idle edge (E)
+ * 25 -> 26 RE empty level
+ * 26 -> 27 RE full level
+ * 27 -> 28 RE idle level
+ * 28 -> 29  unused (software 0) (E)
+ * 29 -> 30  unused (software 1) (E)
+ * 30 -> 31  unused (software 2) - crime 1.5 CPU SysCorError (E)
+ * 31 -> 32 VICE
+ *
+ * S, M, A: Use the MACE ISA interrupt register
+ * MACE_ISA_INT_STAT 31:0
+ *
+ * 0-7 -> 33-40 Audio
+ * 8 -> 41 RTC
+ * 9 -> 42 Keyboard
+ * 10 -> X Keyboard polled
+ * 11 -> 44 Mouse
+ * 12 -> X Mouse polled
+ * 13-15 -> 46-48 Count/compare timers
+ * 16-19 -> 49-52 Parallel (16 E)
+ * 20-25 -> 53-58 Serial 1 (22 E)
+ * 26-31 -> 59-64 Serial 2 (28 E)
+ *
+ * Note that this means IRQs 5-7, 43, and 45 do not exist.  This is a
+ * different IRQ map than IRIX uses, but that's OK as Linux irq handling
+ * is quite different anyway.
+ */
+
+/* Some initial interrupts to set up */
+extern void crime_memerr_intr (unsigned int irq, void *dev_id,
+			       struct pt_regs *regs);
+extern void crime_cpuerr_intr (unsigned int irq, void *dev_id,
+			       struct pt_regs *regs);
+
+struct irqaction memerr_irq = { crime_memerr_intr, SA_INTERRUPT,
+			       0, "CRIME memory error", NULL,
+			       NULL };
+struct irqaction cpuerr_irq = { crime_cpuerr_intr, SA_INTERRUPT,
+			       0, "CRIME CPU error", NULL,
+			       NULL };
+
+extern void ip32_handle_int (void);
+asmlinkage unsigned int do_IRQ(int irq, struct pt_regs *regs);
+
+/*
+ * For interrupts wired from a single device to the CPU.  Only the clock
+ * uses this it seems, which is IRQ 0 and IP7.
+ */
+
+static void enable_cpu_irq(unsigned int irq)
+{
+	set_cp0_status(STATUSF_IP7);
+}
+
+static unsigned int startup_cpu_irq(unsigned int irq)
+{
+	enable_cpu_irq(irq);
+	return 0;
+}
+
+static void disable_cpu_irq(unsigned int irq)
+{
+	clear_cp0_status(STATUSF_IP7);
+}
+
+static void end_cpu_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_cpu_irq (irq);
+}
+
+#define shutdown_cpu_irq disable_cpu_irq
+#define mask_and_ack_cpu_irq disable_cpu_irq
+
+static struct hw_interrupt_type ip32_cpu_interrupt = {
+	"IP32 CPU",
+	startup_cpu_irq,
+	shutdown_cpu_irq,
+	enable_cpu_irq,
+	disable_cpu_irq,
+	mask_and_ack_cpu_irq,
+	end_cpu_irq,
+	NULL
+};
+
+/*
+ * This is for pure CRIME interrupts - ie not MACE.  The advantage?
+ * We get to split the register in half and do faster lookups.
+ */
+
+static void enable_crime_irq(unsigned int irq)
+{
+	u64 crime_mask;
+	unsigned long flags;
+
+	save_and_cli(flags);
+	crime_mask = crime_read_64(CRIME_INT_MASK);
+	crime_mask |= 1 << (irq - 1);
+	crime_write_64(CRIME_INT_MASK, crime_mask);
+	restore_flags(flags);
+}
+
+static unsigned int startup_crime_irq(unsigned int irq)
+{
+	enable_crime_irq(irq);
+	return 0; /* This is probably not right; we could have pending irqs */
+}
+
+static void disable_crime_irq(unsigned int irq)
+{
+	u64 crime_mask;
+	unsigned long flags;
+
+	save_and_cli(flags);
+	crime_mask = crime_read_64(CRIME_INT_MASK);
+	crime_mask &= ~(1 << (irq - 1));
+	crime_write_64(CRIME_INT_MASK, crime_mask);
+	restore_flags(flags);
+}
+
+static void mask_and_ack_crime_irq (unsigned int irq)
+{
+	u64 crime_mask;
+	unsigned long flags;
+
+	/* Edge triggered interrupts must be cleared. */
+	if ((irq >= CRIME_GBE0_IRQ && irq <= CRIME_GBE3_IRQ)
+	    || (irq >= CRIME_RE_EMPTY_E_IRQ && irq <= CRIME_RE_IDLE_E_IRQ)
+	    || (irq >= CRIME_SOFT0_IRQ && irq <= CRIME_SOFT2_IRQ)) {
+		save_and_cli(flags);
+		crime_mask = crime_read_64(CRIME_HARD_INT);
+		crime_mask &= ~(1 << (irq - 1));
+		crime_write_64(CRIME_HARD_INT, crime_mask);
+		restore_flags(flags);
+	}
+	disable_crime_irq(irq);
+}
+
+static void end_crime_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_crime_irq (irq);
+}
+
+#define shutdown_crime_irq disable_crime_irq
+
+static struct hw_interrupt_type ip32_crime_interrupt = {
+	"IP32 CRIME",
+	startup_crime_irq,
+	shutdown_crime_irq,
+	enable_crime_irq,
+	disable_crime_irq,
+	mask_and_ack_crime_irq,
+	end_crime_irq,
+	NULL
+};
+
+/*
+ * This is for MACE PCI interrupts.  We can decrease bus traffic by masking
+ * as close to the source as possible.  This also means we can take the
+ * next chunk of the CRIME register in one piece.
+ */
+
+static void enable_macepci_irq(unsigned int irq)
+{
+	u32 mace_mask;
+	u64 crime_mask;
+	unsigned long flags;
+
+	save_and_cli(flags);
+	mace_mask = mace_read_32(MACEPCI_CONTROL);
+	mace_mask |= MACEPCI_CONTROL_INT(irq - 9);
+	mace_write_32(MACEPCI_CONTROL, mace_mask);
+	/*
+	 * In case the CRIME interrupt isn't enabled, we must enable it;
+	 * however, we never disable interrupts at that level.
+	 */
+	crime_mask = crime_read_64(CRIME_INT_MASK);
+	crime_mask |= 1 << (irq - 1);
+	crime_write_64(CRIME_INT_MASK, crime_mask);
+	restore_flags(flags);
+}
+
+static unsigned int startup_macepci_irq(unsigned int irq)
+{
+	enable_macepci_irq (irq);
+
+	return 0; /* XXX */
+}
+
+static void disable_macepci_irq(unsigned int irq)
+{
+	u32 mace_mask;
+	unsigned long flags;
+
+	save_and_cli(flags);
+	mace_mask = mace_read_32(MACEPCI_CONTROL);
+	mace_mask &= ~MACEPCI_CONTROL_INT(irq - 9);
+	mace_write_32(MACEPCI_CONTROL, mace_mask);
+	restore_flags(flags);
+}
+
+static void end_macepci_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_macepci_irq (irq);
+}
+
+#define shutdown_macepci_irq disable_macepci_irq
+#define mask_and_ack_macepci_irq disable_macepci_irq
+
+static struct hw_interrupt_type ip32_macepci_interrupt = {
+	"IP32 MACE PCI",
+	startup_macepci_irq,
+	shutdown_macepci_irq,
+	enable_macepci_irq,
+	disable_macepci_irq,
+	mask_and_ack_macepci_irq,
+	end_macepci_irq,
+	NULL
+};
+
+/* This is used for MACE ISA interrupts.  That means bits 4-6 in the
+ * CRIME register.
+ */
+
+static void enable_maceisa_irq (unsigned int irq)
+{
+	u64 crime_mask;
+	u32 mace_mask;
+	unsigned int crime_int = 0;
+	unsigned long flags;
+
+	DBG ("maceisa enable: %u\n", irq);
+
+	switch (irq) {
+	case MACEISA_AUDIO_SW_IRQ ... MACEISA_AUDIO3_MERR_IRQ:
+		crime_int = MACE_AUDIO_INT;
+		break;
+	case MACEISA_RTC_IRQ ... MACEISA_TIMER2_IRQ:
+		crime_int = MACE_MISC_INT;
+		break;
+	case MACEISA_PARALLEL_IRQ ... MACEISA_SERIAL2_RDMAOR_IRQ:
+		crime_int = MACE_SUPERIO_INT;
+		break;
+	}
+	DBG ("crime_int %016lx enabled\n", crime_int);
+	save_and_cli(flags);
+	crime_mask = crime_read_64(CRIME_INT_MASK);
+	crime_mask |= crime_int;
+	crime_write_64(CRIME_INT_MASK, crime_mask);
+	mace_mask = mace_read_32(MACEISA_INT_MASK);
+	mace_mask |= 1 << (irq - 33);
+	mace_write_32(MACEISA_INT_MASK, mace_mask);
+	restore_flags(flags);
+}
+
+static unsigned int startup_maceisa_irq (unsigned int irq)
+{
+	enable_maceisa_irq(irq);
+	return 0;
+}
+
+static void disable_maceisa_irq(unsigned int irq)
+{
+	u32 mace_mask;
+	unsigned long flags;
+
+	save_and_cli (flags);
+	mace_mask = mace_read_32(MACEISA_INT_MASK);
+	mace_mask &= ~(1 << (irq - 33));
+	mace_write_32(MACEISA_INT_MASK, mace_mask);
+	restore_flags(flags);
+}
+
+static void mask_and_ack_maceisa_irq(unsigned int irq)
+{
+	u32 mace_mask;
+	unsigned long flags;
+
+	switch (irq) {
+	case MACEISA_PARALLEL_IRQ:
+	case MACEISA_SERIAL1_TDMAPR_IRQ:
+	case MACEISA_SERIAL2_TDMAPR_IRQ:
+		save_and_cli(flags);
+		mace_mask = mace_read_32(MACEISA_INT_STAT);
+		mace_mask &= ~(1 << (irq - 33));
+		mace_write_32(MACEISA_INT_STAT, mace_mask);
+		restore_flags(flags);
+		break;
+	}
+	disable_maceisa_irq(irq);
+}
+
+static void end_maceisa_irq(unsigned irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_maceisa_irq (irq);
+}
+
+#define shutdown_maceisa_irq disable_maceisa_irq
+
+static struct hw_interrupt_type ip32_maceisa_interrupt = {
+	"IP32 MACE ISA",
+	startup_maceisa_irq,
+	shutdown_maceisa_irq,
+	enable_maceisa_irq,
+	disable_maceisa_irq,
+	mask_and_ack_maceisa_irq,
+	end_maceisa_irq,
+	NULL
+};
+
+/* This is used for regular non-ISA, non-PCI MACE interrupts.  That means
+ * bits 0-3 and 7 in the CRIME register.
+ */
+
+static void enable_mace_irq(unsigned int irq)
+{
+	u64 crime_mask;
+	unsigned long flags;
+
+	save_and_cli (flags);
+	crime_mask = crime_read_64 (CRIME_INT_MASK);
+	crime_mask |= 1 << (irq - 1);
+	crime_write_64 (CRIME_INT_MASK, crime_mask);
+	restore_flags (flags);
+}
+
+static unsigned int startup_mace_irq(unsigned int irq)
+{
+	enable_mace_irq(irq);
+	return 0;
+}
+
+static void disable_mace_irq(unsigned int irq)
+{
+	u64 crime_mask;
+	unsigned long flags;
+
+	save_and_cli (flags);
+	crime_mask = crime_read_64 (CRIME_INT_MASK);
+	crime_mask &= ~(1 << (irq - 1));
+	crime_write_64 (CRIME_INT_MASK, crime_mask);
+	restore_flags(flags);
+}
+
+static void end_mace_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_mace_irq (irq);
+}
+
+#define shutdown_mace_irq disable_mace_irq
+#define mask_and_ack_mace_irq disable_mace_irq
+
+static struct hw_interrupt_type ip32_mace_interrupt = {
+	"IP32 MACE",
+	startup_mace_irq,
+	shutdown_mace_irq,
+	enable_mace_irq,
+	disable_mace_irq,
+	mask_and_ack_mace_irq,
+	end_mace_irq,
+	NULL
+};
+
+static void ip32_unknown_interrupt (struct pt_regs *regs)
+{
+	u64 crime;
+	u32 mace;
+
+	printk ("Unknown interrupt occurred!\n");
+	printk ("cp0_status: %08x\tcp0_cause: %08x\n",
+		read_32bit_cp0_register (CP0_STATUS),
+		read_32bit_cp0_register (CP0_CAUSE));
+	crime = crime_read_64 (CRIME_INT_MASK);
+	printk ("CRIME interrupt mask: %016lx\n", crime);
+	crime = crime_read_64 (CRIME_INT_STAT);
+	printk ("CRIME interrupt status: %016lx\n", crime);
+	crime = crime_read_64 (CRIME_HARD_INT);
+	printk ("CRIME hardware interrupt register: %016lx\n", crime);
+	mace = mace_read_32 (MACEISA_INT_MASK);
+	printk ("MACE ISA interrupt mask: %08x\n", mace);
+	mace = mace_read_32 (MACEISA_INT_STAT);
+	printk ("MACE ISA interrupt status: %08x\n", mace);
+	mace = mace_read_32 (MACEPCI_CONTROL);
+	printk ("MACE PCI control register: %08x\n", mace);
+
+	printk("Register dump:\n");
+	show_regs(regs);
+
+	printk("Please mail this report to linux-mips@oss.sgi.com\n");
+	printk("Spinning...");
+	while(1) ;
+}
+
+/* CRIME 1.1 appears to deliver all interrupts to this one pin. */
+void ip32_irq0(struct pt_regs *regs)
+{
+	u64 crime_int;
+	u64 crime_mask;
+	int irq = 0;
+	unsigned long flags;
+
+	save_and_cli (flags);
+	/* disable crime interrupts */
+	crime_mask = crime_read_64(CRIME_INT_MASK);
+	crime_write_64(CRIME_INT_MASK, 0);
+
+	crime_int = crime_read_64(CRIME_INT_STAT);
+
+	if (crime_int & CRIME_MACE_INT_MASK) {
+		crime_int &= CRIME_MACE_INT_MASK;
+		irq = ffs (crime_int);
+	} else if (crime_int & CRIME_MACEISA_INT_MASK) {
+		u32 mace_int;
+		mace_int = mace_read_32 (MACEISA_INT_STAT);
+		if (mace_int == 0)
+			irq = 0;
+		else
+			irq = ffs (mace_int) + 32;
+	} else if (crime_int & CRIME_MACEPCI_INT_MASK) {
+		crime_int &= CRIME_MACEPCI_INT_MASK;
+		crime_int >>= 8;
+		irq = ffs (crime_int) + 8;
+	} else if (crime_int & 0xffff0000) {
+		crime_int >>= 16;
+		irq = ffs (crime_int) + 16;
+	}
+	if (irq == 0)
+		ip32_unknown_interrupt(regs);
+	DBG("*irq %u*\n", irq);
+	do_IRQ(irq, regs);
+
+	/* enable crime interrupts */
+	crime_write_64(CRIME_INT_MASK, crime_mask);
+	restore_flags (flags);
+}
+
+void ip32_irq1(struct pt_regs *regs)
+{
+	ip32_unknown_interrupt (regs);
+}
+
+void ip32_irq2(struct pt_regs *regs)
+{
+	ip32_unknown_interrupt (regs);
+}
+
+void ip32_irq3(struct pt_regs *regs)
+{
+	ip32_unknown_interrupt (regs);
+}
+
+void ip32_irq4(struct pt_regs *regs)
+{
+	ip32_unknown_interrupt (regs);
+}
+
+void ip32_irq5(struct pt_regs *regs)
+{
+	do_IRQ (CLOCK_IRQ, regs);
+}
+
+void __init init_IRQ(void)
+{
+	unsigned int irq;
+	int i;
+
+	/* Install our interrupt handler, then clear and disable all
+	 * CRIME and MACE interrupts.
+	 */
+	crime_write_64(CRIME_INT_MASK, 0);
+	crime_write_64(CRIME_HARD_INT, 0);
+	crime_write_64(CRIME_SOFT_INT, 0);
+	mace_write_32(MACEISA_INT_STAT, 0);
+	mace_write_32(MACEISA_INT_MASK, 0);
+	set_except_vector(0, ip32_handle_int);
+
+	for (i = 0; i < NR_IRQS; i++) {
+		irq_desc[i].status  = IRQ_DISABLED;
+		irq_desc[i].action  = NULL;
+		irq_desc[i].depth   = 1;
+		irq_desc[i].handler = &no_irq_type;
+	}
+
+	for (irq = 0; irq <= IP32_IRQ_MAX; irq++) {
+		hw_irq_controller *controller;
+
+		if (irq == CLOCK_IRQ)
+			controller = &ip32_cpu_interrupt;
+		else if (irq <= MACE_PCI_BRIDGE_IRQ && irq >= MACE_VID_IN1_IRQ)
+			controller = &ip32_mace_interrupt;
+		else if (irq <= MACEPCI_SHARED2_IRQ && irq >= MACEPCI_SCSI0_IRQ)
+			controller = &ip32_macepci_interrupt;
+		else if (irq <= CRIME_VICE_IRQ && irq >= CRIME_GBE0_IRQ)
+			controller = &ip32_crime_interrupt;
+		else
+			controller = &ip32_maceisa_interrupt;
+
+		irq_desc[irq].status = IRQ_DISABLED;
+		irq_desc[irq].action = 0;
+		irq_desc[irq].depth = 0;
+		irq_desc[irq].handler = controller;
+	}
+	setup_irq(CRIME_MEMERR_IRQ, &memerr_irq);
+	setup_irq(CRIME_CPUERR_IRQ, &cpuerr_irq);
+}