506 lines
13 KiB
C
506 lines
13 KiB
C
/*
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* Code to handle IP32 IRQs
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000 Harald Koerfgen
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* Copyright (C) 2001 Keith M Wesolowski
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*/
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <asm/irq_cpu.h>
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#include <asm/mipsregs.h>
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#include <asm/signal.h>
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#include <asm/time.h>
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#include <asm/ip32/crime.h>
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#include <asm/ip32/mace.h>
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#include <asm/ip32/ip32_ints.h>
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/* issue a PIO read to make sure no PIO writes are pending */
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static inline void flush_crime_bus(void)
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{
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crime->control;
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}
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static inline void flush_mace_bus(void)
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{
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mace->perif.ctrl.misc;
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}
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/*
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* O2 irq map
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*
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* IP0 -> software (ignored)
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* IP1 -> software (ignored)
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* IP2 -> (irq0) C crime 1.1 all interrupts; crime 1.5 ???
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* IP3 -> (irq1) X unknown
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* IP4 -> (irq2) X unknown
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* IP5 -> (irq3) X unknown
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* IP6 -> (irq4) X unknown
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* IP7 -> (irq5) 7 CPU count/compare timer (system timer)
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*
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* crime: (C)
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*
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* CRIME_INT_STAT 31:0:
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*
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* 0 -> 8 Video in 1
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* 1 -> 9 Video in 2
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* 2 -> 10 Video out
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* 3 -> 11 Mace ethernet
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* 4 -> S SuperIO sub-interrupt
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* 5 -> M Miscellaneous sub-interrupt
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* 6 -> A Audio sub-interrupt
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* 7 -> 15 PCI bridge errors
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* 8 -> 16 PCI SCSI aic7xxx 0
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* 9 -> 17 PCI SCSI aic7xxx 1
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* 10 -> 18 PCI slot 0
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* 11 -> 19 unused (PCI slot 1)
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* 12 -> 20 unused (PCI slot 2)
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* 13 -> 21 unused (PCI shared 0)
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* 14 -> 22 unused (PCI shared 1)
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* 15 -> 23 unused (PCI shared 2)
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* 16 -> 24 GBE0 (E)
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* 17 -> 25 GBE1 (E)
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* 18 -> 26 GBE2 (E)
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* 19 -> 27 GBE3 (E)
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* 20 -> 28 CPU errors
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* 21 -> 29 Memory errors
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* 22 -> 30 RE empty edge (E)
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* 23 -> 31 RE full edge (E)
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* 24 -> 32 RE idle edge (E)
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* 25 -> 33 RE empty level
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* 26 -> 34 RE full level
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* 27 -> 35 RE idle level
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* 28 -> 36 unused (software 0) (E)
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* 29 -> 37 unused (software 1) (E)
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* 30 -> 38 unused (software 2) - crime 1.5 CPU SysCorError (E)
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* 31 -> 39 VICE
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*
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* S, M, A: Use the MACE ISA interrupt register
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* MACE_ISA_INT_STAT 31:0
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*
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* 0-7 -> 40-47 Audio
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* 8 -> 48 RTC
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* 9 -> 49 Keyboard
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* 10 -> X Keyboard polled
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* 11 -> 51 Mouse
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* 12 -> X Mouse polled
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* 13-15 -> 53-55 Count/compare timers
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* 16-19 -> 56-59 Parallel (16 E)
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* 20-25 -> 60-62 Serial 1 (22 E)
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* 26-31 -> 66-71 Serial 2 (28 E)
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*
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* Note that this means IRQs 12-14, 50, and 52 do not exist. This is a
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* different IRQ map than IRIX uses, but that's OK as Linux irq handling
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* is quite different anyway.
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*/
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/* Some initial interrupts to set up */
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extern irqreturn_t crime_memerr_intr(int irq, void *dev_id);
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extern irqreturn_t crime_cpuerr_intr(int irq, void *dev_id);
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static struct irqaction memerr_irq = {
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.handler = crime_memerr_intr,
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.name = "CRIME memory error",
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};
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static struct irqaction cpuerr_irq = {
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.handler = crime_cpuerr_intr,
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.name = "CRIME CPU error",
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};
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/*
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* This is for pure CRIME interrupts - ie not MACE. The advantage?
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* We get to split the register in half and do faster lookups.
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*/
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static uint64_t crime_mask;
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static inline void crime_enable_irq(struct irq_data *d)
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{
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unsigned int bit = d->irq - CRIME_IRQ_BASE;
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crime_mask |= 1 << bit;
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crime->imask = crime_mask;
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}
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static inline void crime_disable_irq(struct irq_data *d)
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{
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unsigned int bit = d->irq - CRIME_IRQ_BASE;
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crime_mask &= ~(1 << bit);
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crime->imask = crime_mask;
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flush_crime_bus();
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}
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static struct irq_chip crime_level_interrupt = {
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.name = "IP32 CRIME",
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.irq_mask = crime_disable_irq,
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.irq_unmask = crime_enable_irq,
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};
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static void crime_edge_mask_and_ack_irq(struct irq_data *d)
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{
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unsigned int bit = d->irq - CRIME_IRQ_BASE;
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uint64_t crime_int;
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/* Edge triggered interrupts must be cleared. */
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crime_int = crime->hard_int;
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crime_int &= ~(1 << bit);
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crime->hard_int = crime_int;
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crime_disable_irq(d);
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}
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static struct irq_chip crime_edge_interrupt = {
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.name = "IP32 CRIME",
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.irq_ack = crime_edge_mask_and_ack_irq,
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.irq_mask = crime_disable_irq,
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.irq_mask_ack = crime_edge_mask_and_ack_irq,
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.irq_unmask = crime_enable_irq,
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};
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/*
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* This is for MACE PCI interrupts. We can decrease bus traffic by masking
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* as close to the source as possible. This also means we can take the
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* next chunk of the CRIME register in one piece.
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*/
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static unsigned long macepci_mask;
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static void enable_macepci_irq(struct irq_data *d)
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{
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macepci_mask |= MACEPCI_CONTROL_INT(d->irq - MACEPCI_SCSI0_IRQ);
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mace->pci.control = macepci_mask;
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crime_mask |= 1 << (d->irq - CRIME_IRQ_BASE);
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crime->imask = crime_mask;
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}
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static void disable_macepci_irq(struct irq_data *d)
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{
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crime_mask &= ~(1 << (d->irq - CRIME_IRQ_BASE));
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crime->imask = crime_mask;
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flush_crime_bus();
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macepci_mask &= ~MACEPCI_CONTROL_INT(d->irq - MACEPCI_SCSI0_IRQ);
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mace->pci.control = macepci_mask;
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flush_mace_bus();
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}
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static struct irq_chip ip32_macepci_interrupt = {
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.name = "IP32 MACE PCI",
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.irq_mask = disable_macepci_irq,
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.irq_unmask = enable_macepci_irq,
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};
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/* This is used for MACE ISA interrupts. That means bits 4-6 in the
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* CRIME register.
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*/
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#define MACEISA_AUDIO_INT (MACEISA_AUDIO_SW_INT | \
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MACEISA_AUDIO_SC_INT | \
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MACEISA_AUDIO1_DMAT_INT | \
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MACEISA_AUDIO1_OF_INT | \
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MACEISA_AUDIO2_DMAT_INT | \
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MACEISA_AUDIO2_MERR_INT | \
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MACEISA_AUDIO3_DMAT_INT | \
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MACEISA_AUDIO3_MERR_INT)
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#define MACEISA_MISC_INT (MACEISA_RTC_INT | \
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MACEISA_KEYB_INT | \
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MACEISA_KEYB_POLL_INT | \
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MACEISA_MOUSE_INT | \
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MACEISA_MOUSE_POLL_INT | \
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MACEISA_TIMER0_INT | \
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MACEISA_TIMER1_INT | \
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MACEISA_TIMER2_INT)
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#define MACEISA_SUPERIO_INT (MACEISA_PARALLEL_INT | \
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MACEISA_PAR_CTXA_INT | \
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MACEISA_PAR_CTXB_INT | \
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MACEISA_PAR_MERR_INT | \
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MACEISA_SERIAL1_INT | \
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MACEISA_SERIAL1_TDMAT_INT | \
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MACEISA_SERIAL1_TDMAPR_INT | \
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MACEISA_SERIAL1_TDMAME_INT | \
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MACEISA_SERIAL1_RDMAT_INT | \
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MACEISA_SERIAL1_RDMAOR_INT | \
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MACEISA_SERIAL2_INT | \
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MACEISA_SERIAL2_TDMAT_INT | \
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MACEISA_SERIAL2_TDMAPR_INT | \
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MACEISA_SERIAL2_TDMAME_INT | \
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MACEISA_SERIAL2_RDMAT_INT | \
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MACEISA_SERIAL2_RDMAOR_INT)
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static unsigned long maceisa_mask;
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static void enable_maceisa_irq(struct irq_data *d)
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{
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unsigned int crime_int = 0;
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pr_debug("maceisa enable: %u\n", d->irq);
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switch (d->irq) {
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case MACEISA_AUDIO_SW_IRQ ... MACEISA_AUDIO3_MERR_IRQ:
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crime_int = MACE_AUDIO_INT;
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break;
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case MACEISA_RTC_IRQ ... MACEISA_TIMER2_IRQ:
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crime_int = MACE_MISC_INT;
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break;
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case MACEISA_PARALLEL_IRQ ... MACEISA_SERIAL2_RDMAOR_IRQ:
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crime_int = MACE_SUPERIO_INT;
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break;
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}
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pr_debug("crime_int %08x enabled\n", crime_int);
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crime_mask |= crime_int;
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crime->imask = crime_mask;
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maceisa_mask |= 1 << (d->irq - MACEISA_AUDIO_SW_IRQ);
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mace->perif.ctrl.imask = maceisa_mask;
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}
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static void disable_maceisa_irq(struct irq_data *d)
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{
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unsigned int crime_int = 0;
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maceisa_mask &= ~(1 << (d->irq - MACEISA_AUDIO_SW_IRQ));
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if (!(maceisa_mask & MACEISA_AUDIO_INT))
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crime_int |= MACE_AUDIO_INT;
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if (!(maceisa_mask & MACEISA_MISC_INT))
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crime_int |= MACE_MISC_INT;
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if (!(maceisa_mask & MACEISA_SUPERIO_INT))
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crime_int |= MACE_SUPERIO_INT;
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crime_mask &= ~crime_int;
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crime->imask = crime_mask;
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flush_crime_bus();
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mace->perif.ctrl.imask = maceisa_mask;
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flush_mace_bus();
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}
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static void mask_and_ack_maceisa_irq(struct irq_data *d)
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{
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unsigned long mace_int;
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/* edge triggered */
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mace_int = mace->perif.ctrl.istat;
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mace_int &= ~(1 << (d->irq - MACEISA_AUDIO_SW_IRQ));
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mace->perif.ctrl.istat = mace_int;
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disable_maceisa_irq(d);
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}
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static struct irq_chip ip32_maceisa_level_interrupt = {
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.name = "IP32 MACE ISA",
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.irq_mask = disable_maceisa_irq,
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.irq_unmask = enable_maceisa_irq,
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};
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static struct irq_chip ip32_maceisa_edge_interrupt = {
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.name = "IP32 MACE ISA",
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.irq_ack = mask_and_ack_maceisa_irq,
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.irq_mask = disable_maceisa_irq,
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.irq_mask_ack = mask_and_ack_maceisa_irq,
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.irq_unmask = enable_maceisa_irq,
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};
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/* This is used for regular non-ISA, non-PCI MACE interrupts. That means
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* bits 0-3 and 7 in the CRIME register.
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*/
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static void enable_mace_irq(struct irq_data *d)
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{
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unsigned int bit = d->irq - CRIME_IRQ_BASE;
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crime_mask |= (1 << bit);
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crime->imask = crime_mask;
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}
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static void disable_mace_irq(struct irq_data *d)
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{
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unsigned int bit = d->irq - CRIME_IRQ_BASE;
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crime_mask &= ~(1 << bit);
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crime->imask = crime_mask;
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flush_crime_bus();
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}
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static struct irq_chip ip32_mace_interrupt = {
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.name = "IP32 MACE",
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.irq_mask = disable_mace_irq,
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.irq_unmask = enable_mace_irq,
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};
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static void ip32_unknown_interrupt(void)
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{
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printk("Unknown interrupt occurred!\n");
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printk("cp0_status: %08x\n", read_c0_status());
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printk("cp0_cause: %08x\n", read_c0_cause());
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printk("CRIME intr mask: %016lx\n", crime->imask);
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printk("CRIME intr status: %016lx\n", crime->istat);
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printk("CRIME hardware intr register: %016lx\n", crime->hard_int);
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printk("MACE ISA intr mask: %08lx\n", mace->perif.ctrl.imask);
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printk("MACE ISA intr status: %08lx\n", mace->perif.ctrl.istat);
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printk("MACE PCI control register: %08x\n", mace->pci.control);
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printk("Register dump:\n");
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show_regs(get_irq_regs());
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printk("Please mail this report to linux-mips@linux-mips.org\n");
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printk("Spinning...");
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while(1) ;
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}
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/* CRIME 1.1 appears to deliver all interrupts to this one pin. */
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/* change this to loop over all edge-triggered irqs, exception masked out ones */
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static void ip32_irq0(void)
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{
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uint64_t crime_int;
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int irq = 0;
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/*
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* Sanity check interrupt numbering enum.
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* MACE got 32 interrupts and there are 32 MACE ISA interrupts daisy
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* chained.
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*/
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BUILD_BUG_ON(CRIME_VICE_IRQ - MACE_VID_IN1_IRQ != 31);
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BUILD_BUG_ON(MACEISA_SERIAL2_RDMAOR_IRQ - MACEISA_AUDIO_SW_IRQ != 31);
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crime_int = crime->istat & crime_mask;
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/* crime sometime delivers spurious interrupts, ignore them */
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if (unlikely(crime_int == 0))
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return;
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irq = MACE_VID_IN1_IRQ + __ffs(crime_int);
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if (crime_int & CRIME_MACEISA_INT_MASK) {
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unsigned long mace_int = mace->perif.ctrl.istat;
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irq = __ffs(mace_int & maceisa_mask) + MACEISA_AUDIO_SW_IRQ;
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}
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pr_debug("*irq %u*\n", irq);
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do_IRQ(irq);
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}
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static void ip32_irq1(void)
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{
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ip32_unknown_interrupt();
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}
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static void ip32_irq2(void)
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{
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ip32_unknown_interrupt();
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}
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static void ip32_irq3(void)
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{
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ip32_unknown_interrupt();
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}
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static void ip32_irq4(void)
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{
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ip32_unknown_interrupt();
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}
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static void ip32_irq5(void)
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{
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do_IRQ(MIPS_CPU_IRQ_BASE + 7);
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}
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asmlinkage void plat_irq_dispatch(void)
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{
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unsigned int pending = read_c0_status() & read_c0_cause();
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if (likely(pending & IE_IRQ0))
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ip32_irq0();
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else if (unlikely(pending & IE_IRQ1))
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ip32_irq1();
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else if (unlikely(pending & IE_IRQ2))
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ip32_irq2();
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else if (unlikely(pending & IE_IRQ3))
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ip32_irq3();
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else if (unlikely(pending & IE_IRQ4))
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ip32_irq4();
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else if (likely(pending & IE_IRQ5))
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ip32_irq5();
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}
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void __init arch_init_irq(void)
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{
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unsigned int irq;
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/* Install our interrupt handler, then clear and disable all
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* CRIME and MACE interrupts. */
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crime->imask = 0;
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crime->hard_int = 0;
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crime->soft_int = 0;
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mace->perif.ctrl.istat = 0;
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mace->perif.ctrl.imask = 0;
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mips_cpu_irq_init();
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for (irq = CRIME_IRQ_BASE; irq <= IP32_IRQ_MAX; irq++) {
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switch (irq) {
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case MACE_VID_IN1_IRQ ... MACE_PCI_BRIDGE_IRQ:
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irq_set_chip_and_handler_name(irq,
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&ip32_mace_interrupt,
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handle_level_irq,
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"level");
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break;
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case MACEPCI_SCSI0_IRQ ... MACEPCI_SHARED2_IRQ:
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irq_set_chip_and_handler_name(irq,
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&ip32_macepci_interrupt,
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handle_level_irq,
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"level");
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break;
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case CRIME_CPUERR_IRQ:
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case CRIME_MEMERR_IRQ:
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irq_set_chip_and_handler_name(irq,
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&crime_level_interrupt,
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handle_level_irq,
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"level");
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break;
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case CRIME_GBE0_IRQ ... CRIME_GBE3_IRQ:
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case CRIME_RE_EMPTY_E_IRQ ... CRIME_RE_IDLE_E_IRQ:
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case CRIME_SOFT0_IRQ ... CRIME_SOFT2_IRQ:
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case CRIME_VICE_IRQ:
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irq_set_chip_and_handler_name(irq,
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&crime_edge_interrupt,
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handle_edge_irq,
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"edge");
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break;
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case MACEISA_PARALLEL_IRQ:
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case MACEISA_SERIAL1_TDMAPR_IRQ:
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case MACEISA_SERIAL2_TDMAPR_IRQ:
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irq_set_chip_and_handler_name(irq,
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&ip32_maceisa_edge_interrupt,
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handle_edge_irq,
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"edge");
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break;
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default:
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irq_set_chip_and_handler_name(irq,
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&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);
|
|
}
|