Initial import

1 files changed, 504 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip32/ip32-irq.c b/arch/mips/sgi-ip32/ip32-irq.c
new file mode 100644
index 000000000..e0c7d9e14
--- /dev/null
+++ b/arch/mips/sgi-ip32/ip32-irq.c
@@ -0,0 +1,504 @@
+/*
+ * 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/irq.h>
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/signal.h>
+#include <asm/time.h>
+#include <asm/ip32/crime.h>
+#include <asm/ip32/mace.h>
+#include <asm/ip32/ip32_ints.h>
+
+/* issue a PIO read to make sure no PIO writes are pending */
+static void inline flush_crime_bus(void)
+{
+	crime->control;
+}
+
+static void inline flush_mace_bus(void)
+{
+	mace->perif.ctrl.misc;
+}
+
+/*
+ * 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) 7 CPU count/compare timer (system timer)
+ *
+ * crime: (C)
+ *
+ * CRIME_INT_STAT 31:0:
+ *
+ * 0  ->  8  Video in 1
+ * 1  ->  9 Video in 2
+ * 2  -> 10  Video out
+ * 3  -> 11  Mace ethernet
+ * 4  -> S  SuperIO sub-interrupt
+ * 5  -> M  Miscellaneous sub-interrupt
+ * 6  -> A  Audio sub-interrupt
+ * 7  -> 15  PCI bridge errors
+ * 8  -> 16  PCI SCSI aic7xxx 0
+ * 9  -> 17 PCI SCSI aic7xxx 1
+ * 10 -> 18 PCI slot 0
+ * 11 -> 19 unused (PCI slot 1)
+ * 12 -> 20 unused (PCI slot 2)
+ * 13 -> 21 unused (PCI shared 0)
+ * 14 -> 22 unused (PCI shared 1)
+ * 15 -> 23 unused (PCI shared 2)
+ * 16 -> 24 GBE0 (E)
+ * 17 -> 25 GBE1 (E)
+ * 18 -> 26 GBE2 (E)
+ * 19 -> 27 GBE3 (E)
+ * 20 -> 28 CPU errors
+ * 21 -> 29 Memory errors
+ * 22 -> 30 RE empty edge (E)
+ * 23 -> 31 RE full edge (E)
+ * 24 -> 32 RE idle edge (E)
+ * 25 -> 33 RE empty level
+ * 26 -> 34 RE full level
+ * 27 -> 35 RE idle level
+ * 28 -> 36 unused (software 0) (E)
+ * 29 -> 37 unused (software 1) (E)
+ * 30 -> 38 unused (software 2) - crime 1.5 CPU SysCorError (E)
+ * 31 -> 39 VICE
+ *
+ * S, M, A: Use the MACE ISA interrupt register
+ * MACE_ISA_INT_STAT 31:0
+ *
+ * 0-7 -> 40-47 Audio
+ * 8 -> 48 RTC
+ * 9 -> 49 Keyboard
+ * 10 -> X Keyboard polled
+ * 11 -> 51 Mouse
+ * 12 -> X Mouse polled
+ * 13-15 -> 53-55 Count/compare timers
+ * 16-19 -> 56-59 Parallel (16 E)
+ * 20-25 -> 60-62 Serial 1 (22 E)
+ * 26-31 -> 66-71 Serial 2 (28 E)
+ *
+ * Note that this means IRQs 12-14, 50, and 52 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 irqreturn_t crime_memerr_intr(int irq, void *dev_id);
+extern irqreturn_t crime_cpuerr_intr(int irq, void *dev_id);
+
+static struct irqaction memerr_irq = {
+	.handler = crime_memerr_intr,
+	.name = "CRIME memory error",
+};
+
+static struct irqaction cpuerr_irq = {
+	.handler = crime_cpuerr_intr,
+	.name = "CRIME CPU error",
+};
+
+/*
+ * This is for pure CRIME interrupts - ie not MACE.  The advantage?
+ * We get to split the register in half and do faster lookups.
+ */
+
+static uint64_t crime_mask;
+
+static inline void crime_enable_irq(struct irq_data *d)
+{
+	unsigned int bit = d->irq - CRIME_IRQ_BASE;
+
+	crime_mask |= 1 << bit;
+	crime->imask = crime_mask;
+}
+
+static inline void crime_disable_irq(struct irq_data *d)
+{
+	unsigned int bit = d->irq - CRIME_IRQ_BASE;
+
+	crime_mask &= ~(1 << bit);
+	crime->imask = crime_mask;
+	flush_crime_bus();
+}
+
+static struct irq_chip crime_level_interrupt = {
+	.name		= "IP32 CRIME",
+	.irq_mask	= crime_disable_irq,
+	.irq_unmask	= crime_enable_irq,
+};
+
+static void crime_edge_mask_and_ack_irq(struct irq_data *d)
+{
+	unsigned int bit = d->irq - CRIME_IRQ_BASE;
+	uint64_t crime_int;
+
+	/* Edge triggered interrupts must be cleared. */
+	crime_int = crime->hard_int;
+	crime_int &= ~(1 << bit);
+	crime->hard_int = crime_int;
+
+	crime_disable_irq(d);
+}
+
+static struct irq_chip crime_edge_interrupt = {
+	.name		= "IP32 CRIME",
+	.irq_ack	= crime_edge_mask_and_ack_irq,
+	.irq_mask	= crime_disable_irq,
+	.irq_mask_ack	= crime_edge_mask_and_ack_irq,
+	.irq_unmask	= crime_enable_irq,
+};
+
+/*
+ * 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 unsigned long macepci_mask;
+
+static void enable_macepci_irq(struct irq_data *d)
+{
+	macepci_mask |= MACEPCI_CONTROL_INT(d->irq - MACEPCI_SCSI0_IRQ);
+	mace->pci.control = macepci_mask;
+	crime_mask |= 1 << (d->irq - CRIME_IRQ_BASE);
+	crime->imask = crime_mask;
+}
+
+static void disable_macepci_irq(struct irq_data *d)
+{
+	crime_mask &= ~(1 << (d->irq - CRIME_IRQ_BASE));
+	crime->imask = crime_mask;
+	flush_crime_bus();
+	macepci_mask &= ~MACEPCI_CONTROL_INT(d->irq - MACEPCI_SCSI0_IRQ);
+	mace->pci.control = macepci_mask;
+	flush_mace_bus();
+}
+
+static struct irq_chip ip32_macepci_interrupt = {
+	.name = "IP32 MACE PCI",
+	.irq_mask = disable_macepci_irq,
+	.irq_unmask = enable_macepci_irq,
+};
+
+/* This is used for MACE ISA interrupts.  That means bits 4-6 in the
+ * CRIME register.
+ */
+
+#define MACEISA_AUDIO_INT	(MACEISA_AUDIO_SW_INT |		\
+				 MACEISA_AUDIO_SC_INT |		\
+				 MACEISA_AUDIO1_DMAT_INT |	\
+				 MACEISA_AUDIO1_OF_INT |	\
+				 MACEISA_AUDIO2_DMAT_INT |	\
+				 MACEISA_AUDIO2_MERR_INT |	\
+				 MACEISA_AUDIO3_DMAT_INT |	\
+				 MACEISA_AUDIO3_MERR_INT)
+#define MACEISA_MISC_INT	(MACEISA_RTC_INT |		\
+				 MACEISA_KEYB_INT |		\
+				 MACEISA_KEYB_POLL_INT |	\
+				 MACEISA_MOUSE_INT |		\
+				 MACEISA_MOUSE_POLL_INT |	\
+				 MACEISA_TIMER0_INT |		\
+				 MACEISA_TIMER1_INT |		\
+				 MACEISA_TIMER2_INT)
+#define MACEISA_SUPERIO_INT	(MACEISA_PARALLEL_INT |		\
+				 MACEISA_PAR_CTXA_INT |		\
+				 MACEISA_PAR_CTXB_INT |		\
+				 MACEISA_PAR_MERR_INT |		\
+				 MACEISA_SERIAL1_INT |		\
+				 MACEISA_SERIAL1_TDMAT_INT |	\
+				 MACEISA_SERIAL1_TDMAPR_INT |	\
+				 MACEISA_SERIAL1_TDMAME_INT |	\
+				 MACEISA_SERIAL1_RDMAT_INT |	\
+				 MACEISA_SERIAL1_RDMAOR_INT |	\
+				 MACEISA_SERIAL2_INT |		\
+				 MACEISA_SERIAL2_TDMAT_INT |	\
+				 MACEISA_SERIAL2_TDMAPR_INT |	\
+				 MACEISA_SERIAL2_TDMAME_INT |	\
+				 MACEISA_SERIAL2_RDMAT_INT |	\
+				 MACEISA_SERIAL2_RDMAOR_INT)
+
+static unsigned long maceisa_mask;
+
+static void enable_maceisa_irq(struct irq_data *d)
+{
+	unsigned int crime_int = 0;
+
+	pr_debug("maceisa enable: %u\n", d->irq);
+
+	switch (d->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;
+	}
+	pr_debug("crime_int %08x enabled\n", crime_int);
+	crime_mask |= crime_int;
+	crime->imask = crime_mask;
+	maceisa_mask |= 1 << (d->irq - MACEISA_AUDIO_SW_IRQ);
+	mace->perif.ctrl.imask = maceisa_mask;
+}
+
+static void disable_maceisa_irq(struct irq_data *d)
+{
+	unsigned int crime_int = 0;
+
+	maceisa_mask &= ~(1 << (d->irq - MACEISA_AUDIO_SW_IRQ));
+	if (!(maceisa_mask & MACEISA_AUDIO_INT))
+		crime_int |= MACE_AUDIO_INT;
+	if (!(maceisa_mask & MACEISA_MISC_INT))
+		crime_int |= MACE_MISC_INT;
+	if (!(maceisa_mask & MACEISA_SUPERIO_INT))
+		crime_int |= MACE_SUPERIO_INT;
+	crime_mask &= ~crime_int;
+	crime->imask = crime_mask;
+	flush_crime_bus();
+	mace->perif.ctrl.imask = maceisa_mask;
+	flush_mace_bus();
+}
+
+static void mask_and_ack_maceisa_irq(struct irq_data *d)
+{
+	unsigned long mace_int;
+
+	/* edge triggered */
+	mace_int = mace->perif.ctrl.istat;
+	mace_int &= ~(1 << (d->irq - MACEISA_AUDIO_SW_IRQ));
+	mace->perif.ctrl.istat = mace_int;
+
+	disable_maceisa_irq(d);
+}
+
+static struct irq_chip ip32_maceisa_level_interrupt = {
+	.name		= "IP32 MACE ISA",
+	.irq_mask	= disable_maceisa_irq,
+	.irq_unmask	= enable_maceisa_irq,
+};
+
+static struct irq_chip ip32_maceisa_edge_interrupt = {
+	.name		= "IP32 MACE ISA",
+	.irq_ack	= mask_and_ack_maceisa_irq,
+	.irq_mask	= disable_maceisa_irq,
+	.irq_mask_ack	= mask_and_ack_maceisa_irq,
+	.irq_unmask	= enable_maceisa_irq,
+};
+
+/* 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(struct irq_data *d)
+{
+	unsigned int bit = d->irq - CRIME_IRQ_BASE;
+
+	crime_mask |= (1 << bit);
+	crime->imask = crime_mask;
+}
+
+static void disable_mace_irq(struct irq_data *d)
+{
+	unsigned int bit = d->irq - CRIME_IRQ_BASE;
+
+	crime_mask &= ~(1 << bit);
+	crime->imask = crime_mask;
+	flush_crime_bus();
+}
+
+static struct irq_chip ip32_mace_interrupt = {
+	.name = "IP32 MACE",
+	.irq_mask = disable_mace_irq,
+	.irq_unmask = enable_mace_irq,
+};
+
+static void ip32_unknown_interrupt(void)
+{
+	printk("Unknown interrupt occurred!\n");
+	printk("cp0_status: %08x\n", read_c0_status());
+	printk("cp0_cause: %08x\n", read_c0_cause());
+	printk("CRIME intr mask: %016lx\n", crime->imask);
+	printk("CRIME intr status: %016lx\n", crime->istat);
+	printk("CRIME hardware intr register: %016lx\n", crime->hard_int);
+	printk("MACE ISA intr mask: %08lx\n", mace->perif.ctrl.imask);
+	printk("MACE ISA intr status: %08lx\n", mace->perif.ctrl.istat);
+	printk("MACE PCI control register: %08x\n", mace->pci.control);
+
+	printk("Register dump:\n");
+	show_regs(get_irq_regs());
+
+	printk("Please mail this report to linux-mips@linux-mips.org\n");
+	printk("Spinning...");
+	while(1) ;
+}
+
+/* CRIME 1.1 appears to deliver all interrupts to this one pin. */
+/* change this to loop over all edge-triggered irqs, exception masked out ones */
+static void ip32_irq0(void)
+{
+	uint64_t crime_int;
+	int irq = 0;
+
+	/*
+	 * Sanity check interrupt numbering enum.
+	 * MACE got 32 interrupts and there are 32 MACE ISA interrupts daisy
+	 * chained.
+	 */
+	BUILD_BUG_ON(CRIME_VICE_IRQ - MACE_VID_IN1_IRQ != 31);
+	BUILD_BUG_ON(MACEISA_SERIAL2_RDMAOR_IRQ - MACEISA_AUDIO_SW_IRQ != 31);
+
+	crime_int = crime->istat & crime_mask;
+
+	/* crime sometime delivers spurious interrupts, ignore them */
+	if (unlikely(crime_int == 0))
+		return;
+
+	irq = MACE_VID_IN1_IRQ + __ffs(crime_int);
+
+	if (crime_int & CRIME_MACEISA_INT_MASK) {
+		unsigned long mace_int = mace->perif.ctrl.istat;
+		irq = __ffs(mace_int & maceisa_mask) + MACEISA_AUDIO_SW_IRQ;
+	}
+
+	pr_debug("*irq %u*\n", irq);
+	do_IRQ(irq);
+}
+
+static void ip32_irq1(void)
+{
+	ip32_unknown_interrupt();
+}
+
+static void ip32_irq2(void)
+{
+	ip32_unknown_interrupt();
+}
+
+static void ip32_irq3(void)
+{
+	ip32_unknown_interrupt();
+}
+
+static void ip32_irq4(void)
+{
+	ip32_unknown_interrupt();
+}
+
+static void ip32_irq5(void)
+{
+	do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int pending = read_c0_status() & read_c0_cause();
+
+	if (likely(pending & IE_IRQ0))
+		ip32_irq0();
+	else if (unlikely(pending & IE_IRQ1))
+		ip32_irq1();
+	else if (unlikely(pending & IE_IRQ2))
+		ip32_irq2();
+	else if (unlikely(pending & IE_IRQ3))
+		ip32_irq3();
+	else if (unlikely(pending & IE_IRQ4))
+		ip32_irq4();
+	else if (likely(pending & IE_IRQ5))
+		ip32_irq5();
+}
+
+void __init arch_init_irq(void)
+{
+	unsigned int irq;
+
+	/* Install our interrupt handler, then clear and disable all
+	 * CRIME and MACE interrupts. */
+	crime->imask = 0;
+	crime->hard_int = 0;
+	crime->soft_int = 0;
+	mace->perif.ctrl.istat = 0;
+	mace->perif.ctrl.imask = 0;
+
+	mips_cpu_irq_init();
+	for (irq = CRIME_IRQ_BASE; irq <= IP32_IRQ_MAX; irq++) {
+		switch (irq) {
+		case MACE_VID_IN1_IRQ ... MACE_PCI_BRIDGE_IRQ:
+			irq_set_chip_and_handler_name(irq,
+						      &ip32_mace_interrupt,
+						      handle_level_irq,
+						      "level");
+			break;
+
+		case MACEPCI_SCSI0_IRQ ...  MACEPCI_SHARED2_IRQ:
+			irq_set_chip_and_handler_name(irq,
+						      &ip32_macepci_interrupt,
+						      handle_level_irq,
+						      "level");
+			break;
+
+		case CRIME_CPUERR_IRQ:
+		case CRIME_MEMERR_IRQ:
+			irq_set_chip_and_handler_name(irq,
+						      &crime_level_interrupt,
+						      handle_level_irq,
+						      "level");
+			break;
+
+		case CRIME_GBE0_IRQ ... CRIME_GBE3_IRQ:
+		case CRIME_RE_EMPTY_E_IRQ ... CRIME_RE_IDLE_E_IRQ:
+		case CRIME_SOFT0_IRQ ... CRIME_SOFT2_IRQ:
+		case CRIME_VICE_IRQ:
+			irq_set_chip_and_handler_name(irq,
+						      &crime_edge_interrupt,
+						      handle_edge_irq,
+						      "edge");
+			break;
+
+		case MACEISA_PARALLEL_IRQ:
+		case MACEISA_SERIAL1_TDMAPR_IRQ:
+		case MACEISA_SERIAL2_TDMAPR_IRQ:
+			irq_set_chip_and_handler_name(irq,
+						      &ip32_maceisa_edge_interrupt,
+						      handle_edge_irq,
+						      "edge");
+			break;
+
+		default:
+			irq_set_chip_and_handler_name(irq,
+						      &ip32_maceisa_level_interrupt,
+						      handle_level_irq,
+						      "level");
+			break;
+		}
+	}
+	setup_irq(CRIME_MEMERR_IRQ, &memerr_irq);
+	setup_irq(CRIME_CPUERR_IRQ, &cpuerr_irq);
+
+#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
+	change_c0_status(ST0_IM, ALLINTS);
+}