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-rw-r--r--arch/mips/sgi-ip32/ip32-irq.c499
1 files changed, 499 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..e21ea1de0
--- /dev/null
+++ b/arch/mips/sgi-ip32/ip32-irq.c
@@ -0,0 +1,499 @@
+/*
+ * 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 <linux/sched/debug.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 inline void flush_crime_bus(void)
+{
+ crime->control;
+}
+
+static inline void 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);
+
+/*
+ * 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@vger.kernel.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;
+ }
+ }
+ if (request_irq(CRIME_MEMERR_IRQ, crime_memerr_intr, 0,
+ "CRIME memory error", NULL))
+ pr_err("Failed to register CRIME memory error interrupt\n");
+ if (request_irq(CRIME_CPUERR_IRQ, crime_cpuerr_intr, 0,
+ "CRIME CPU error", NULL))
+ pr_err("Failed to register CRIME CPU error interrupt\n");
+
+#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
+ change_c0_status(ST0_IM, ALLINTS);
+}
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