/* * 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/irq_cpu.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) { 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); struct irqaction memerr_irq = { .handler = crime_memerr_intr, .flags = IRQF_DISABLED, .mask = CPU_MASK_NONE, .name = "CRIME memory error", }; struct irqaction cpuerr_irq = { .handler = crime_cpuerr_intr, .flags = IRQF_DISABLED, .mask = CPU_MASK_NONE, .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(unsigned int irq) { unsigned int bit = irq - CRIME_IRQ_BASE; crime_mask |= 1 << bit; crime->imask = crime_mask; } static inline void crime_disable_irq(unsigned int irq) { unsigned int bit = irq - CRIME_IRQ_BASE; crime_mask &= ~(1 << bit); crime->imask = crime_mask; flush_crime_bus(); } static void crime_level_mask_and_ack_irq(unsigned int irq) { crime_disable_irq(irq); } static void crime_level_end_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) crime_enable_irq(irq); } static struct irq_chip crime_level_interrupt = { .name = "IP32 CRIME", .ack = crime_level_mask_and_ack_irq, .mask = crime_disable_irq, .mask_ack = crime_level_mask_and_ack_irq, .unmask = crime_enable_irq, .end = crime_level_end_irq, }; static void crime_edge_mask_and_ack_irq(unsigned int irq) { unsigned int bit = 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(irq); } static void crime_edge_end_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) crime_enable_irq(irq); } static struct irq_chip crime_edge_interrupt = { .name = "IP32 CRIME", .ack = crime_edge_mask_and_ack_irq, .mask = crime_disable_irq, .mask_ack = crime_edge_mask_and_ack_irq, .unmask = crime_enable_irq, .end = crime_edge_end_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(unsigned int irq) { macepci_mask |= MACEPCI_CONTROL_INT(irq - MACEPCI_SCSI0_IRQ); mace->pci.control = macepci_mask; crime_mask |= 1 << (irq - CRIME_IRQ_BASE); crime->imask = crime_mask; } static void disable_macepci_irq(unsigned int irq) { crime_mask &= ~(1 << (irq - CRIME_IRQ_BASE)); crime->imask = crime_mask; flush_crime_bus(); macepci_mask &= ~MACEPCI_CONTROL_INT(irq - MACEPCI_SCSI0_IRQ); mace->pci.control = macepci_mask; flush_mace_bus(); } static void end_macepci_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) enable_macepci_irq(irq); } static struct irq_chip ip32_macepci_interrupt = { .name = "IP32 MACE PCI", .ack = disable_macepci_irq, .mask = disable_macepci_irq, .mask_ack = disable_macepci_irq, .unmask = enable_macepci_irq, .end = end_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(unsigned int irq) { unsigned int crime_int = 0; pr_debug("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; } pr_debug("crime_int %08x enabled\n", crime_int); crime_mask |= crime_int; crime->imask = crime_mask; maceisa_mask |= 1 << (irq - MACEISA_AUDIO_SW_IRQ); mace->perif.ctrl.imask = maceisa_mask; } static void disable_maceisa_irq(unsigned int irq) { unsigned int crime_int = 0; maceisa_mask &= ~(1 << (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(unsigned int irq) { unsigned long mace_int; switch (irq) { case MACEISA_PARALLEL_IRQ: case MACEISA_SERIAL1_TDMAPR_IRQ: case MACEISA_SERIAL2_TDMAPR_IRQ: /* edge triggered */ mace_int = mace->perif.ctrl.istat; mace_int &= ~(1 << (irq - MACEISA_AUDIO_SW_IRQ)); mace->perif.ctrl.istat = mace_int; 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); } static struct irq_chip ip32_maceisa_interrupt = { .name = "IP32 MACE ISA", .ack = mask_and_ack_maceisa_irq, .mask = disable_maceisa_irq, .mask_ack = mask_and_ack_maceisa_irq, .unmask = enable_maceisa_irq, .end = end_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(unsigned int irq) { unsigned int bit = irq - CRIME_IRQ_BASE; crime_mask |= (1 << bit); crime->imask = crime_mask; } static void disable_mace_irq(unsigned int irq) { unsigned int bit = irq - CRIME_IRQ_BASE; crime_mask &= ~(1 << bit); crime->imask = crime_mask; flush_crime_bus(); } static void end_mace_irq(unsigned int irq) { if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) enable_mace_irq(irq); } static struct irq_chip ip32_mace_interrupt = { .name = "IP32 MACE", .ack = disable_mace_irq, .mask = disable_mace_irq, .mask_ack = disable_mace_irq, .unmask = enable_mace_irq, .end = end_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; 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: set_irq_chip(irq, &ip32_mace_interrupt); break; case MACEPCI_SCSI0_IRQ ... MACEPCI_SHARED2_IRQ: set_irq_chip(irq, &ip32_macepci_interrupt); break; case CRIME_GBE0_IRQ ... CRIME_GBE3_IRQ: set_irq_chip(irq, &crime_edge_interrupt); break; case CRIME_CPUERR_IRQ: case CRIME_MEMERR_IRQ: set_irq_chip(irq, &crime_level_interrupt); break; case CRIME_RE_EMPTY_E_IRQ ... CRIME_RE_IDLE_E_IRQ: case CRIME_SOFT0_IRQ ... CRIME_SOFT2_IRQ: set_irq_chip(irq, &crime_edge_interrupt); break; case CRIME_VICE_IRQ: set_irq_chip(irq, &crime_edge_interrupt); break; default: set_irq_chip(irq, &ip32_maceisa_interrupt); 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); }