diff options
Diffstat (limited to 'arch/mips/sgi-ip32/ip32-irq.c')
| -rw-r--r-- | arch/mips/sgi-ip32/ip32-irq.c | 590 |
1 files changed, 590 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 0000000..fc3a8e9 --- /dev/null +++ b/arch/mips/sgi-ip32/ip32-irq.c @@ -0,0 +1,590 @@ +/* + * 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/slab.h> +#include <linux/mm.h> +#include <linux/random.h> +#include <linux/sched.h> + +#include <asm/mipsregs.h> +#include <asm/signal.h> +#include <asm/system.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) +{ + volatile unsigned long junk = crime->control; +} + +static void inline flush_mace_bus(void) +{ + volatile unsigned long junk = mace->perif.ctrl.misc; +} + +#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. + */ + +/* + * IRQ spinlock - Ralf says not to disable CPU interrupts, + * and I think he knows better. + */ +static DEFINE_SPINLOCK(ip32_irq_lock); + +/* Some initial interrupts to set up */ +extern irqreturn_t crime_memerr_intr (int irq, void *dev_id, + struct pt_regs *regs); +extern irqreturn_t crime_cpuerr_intr (int irq, void *dev_id, + struct pt_regs *regs); + +struct irqaction memerr_irq = { crime_memerr_intr, SA_INTERRUPT, + CPU_MASK_NONE, "CRIME memory error", NULL, NULL }; +struct irqaction cpuerr_irq = { crime_cpuerr_intr, SA_INTERRUPT, + CPU_MASK_NONE, "CRIME CPU error", NULL, NULL }; + +extern void ip32_handle_int(void); + +/* + * 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_c0_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_c0_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 uint64_t crime_mask; + +static void enable_crime_irq(unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_mask |= 1 << (irq - 1); + crime->imask = crime_mask; + spin_unlock_irqrestore(&ip32_irq_lock, 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) +{ + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_mask &= ~(1 << (irq - 1)); + crime->imask = crime_mask; + flush_crime_bus(); + spin_unlock_irqrestore(&ip32_irq_lock, flags); +} + +static void mask_and_ack_crime_irq(unsigned int irq) +{ + 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)) { + uint64_t crime_int; + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_int = crime->hard_int; + crime_int &= ~(1 << (irq - 1)); + crime->hard_int = crime_int; + spin_unlock_irqrestore(&ip32_irq_lock, 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 unsigned long macepci_mask; + +static void enable_macepci_irq(unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + macepci_mask |= MACEPCI_CONTROL_INT(irq - 9); + mace->pci.control = macepci_mask; + crime_mask |= 1 << (irq - 1); + crime->imask = crime_mask; + spin_unlock_irqrestore(&ip32_irq_lock, flags); +} + +static unsigned int startup_macepci_irq(unsigned int irq) +{ + enable_macepci_irq (irq); + return 0; +} + +static void disable_macepci_irq(unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_mask &= ~(1 << (irq - 1)); + crime->imask = crime_mask; + flush_crime_bus(); + macepci_mask &= ~MACEPCI_CONTROL_INT(irq - 9); + mace->pci.control = macepci_mask; + flush_mace_bus(); + spin_unlock_irqrestore(&ip32_irq_lock, 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. + */ + +#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 (unsigned int irq) +{ + 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 %08x enabled\n", crime_int); + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_mask |= crime_int; + crime->imask = crime_mask; + maceisa_mask |= 1 << (irq - 33); + mace->perif.ctrl.imask = maceisa_mask; + spin_unlock_irqrestore(&ip32_irq_lock, flags); +} + +static unsigned int startup_maceisa_irq(unsigned int irq) +{ + enable_maceisa_irq(irq); + return 0; +} + +static void disable_maceisa_irq(unsigned int irq) +{ + unsigned int crime_int = 0; + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + maceisa_mask &= ~(1 << (irq - 33)); + 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(); + spin_unlock_irqrestore(&ip32_irq_lock, flags); +} + +static void mask_and_ack_maceisa_irq(unsigned int irq) +{ + unsigned long mace_int, flags; + + switch (irq) { + case MACEISA_PARALLEL_IRQ: + case MACEISA_SERIAL1_TDMAPR_IRQ: + case MACEISA_SERIAL2_TDMAPR_IRQ: + /* edge triggered */ + spin_lock_irqsave(&ip32_irq_lock, flags); + mace_int = mace->perif.ctrl.istat; + mace_int &= ~(1 << (irq - 33)); + mace->perif.ctrl.istat = mace_int; + spin_unlock_irqrestore(&ip32_irq_lock, 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) +{ + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_mask |= 1 << (irq - 1); + crime->imask = crime_mask; + spin_unlock_irqrestore(&ip32_irq_lock, flags); +} + +static unsigned int startup_mace_irq(unsigned int irq) +{ + enable_mace_irq(irq); + return 0; +} + +static void disable_mace_irq(unsigned int irq) +{ + unsigned long flags; + + spin_lock_irqsave(&ip32_irq_lock, flags); + crime_mask &= ~(1 << (irq - 1)); + crime->imask = crime_mask; + flush_crime_bus(); + spin_unlock_irqrestore(&ip32_irq_lock, 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) +{ + 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(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 */ +void ip32_irq0(struct pt_regs *regs) +{ + uint64_t crime_int; + int irq = 0; + + crime_int = crime->istat & crime_mask; + irq = ffs(crime_int); + crime_int = 1 << (irq - 1); + + if (crime_int & CRIME_MACEISA_INT_MASK) { + unsigned long mace_int = mace->perif.ctrl.istat; + irq = ffs(mace_int & maceisa_mask) + 32; + } + DBG("*irq %u*\n", irq); + do_IRQ(irq, regs); +} + +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) +{ + ll_timer_interrupt(IP32_R4K_TIMER_IRQ, regs); +} + +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; + set_except_vector(0, ip32_handle_int); + + for (irq = 0; irq <= IP32_IRQ_MAX; irq++) { + hw_irq_controller *controller; + + if (irq == IP32_R4K_TIMER_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); + +#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5) + change_c0_status(ST0_IM, ALLINTS); +} |
