ip32-irq.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:14k
- /*
- * 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 <asm/bitops.h>
- #include <asm/mipsregs.h>
- #include <asm/system.h>
- #include <asm/ip32/ip32_ints.h>
- #include <asm/ip32/crime.h>
- #include <asm/ip32/mace.h>
- #include <asm/signal.h>
- #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.
- */
- /* Some initial interrupts to set up */
- extern void crime_memerr_intr (unsigned int irq, void *dev_id,
- struct pt_regs *regs);
- extern void crime_cpuerr_intr (unsigned int irq, void *dev_id,
- struct pt_regs *regs);
- struct irqaction memerr_irq = { crime_memerr_intr, SA_INTERRUPT,
- 0, "CRIME memory error", NULL,
- NULL };
- struct irqaction cpuerr_irq = { crime_cpuerr_intr, SA_INTERRUPT,
- 0, "CRIME CPU error", NULL,
- NULL };
- unsigned long spurious_count = 0;
- extern void ip32_handle_int (void);
- extern void do_IRQ (unsigned int irq, struct pt_regs *regs);
- /* 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_cp0_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_cp0_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 void enable_crime_irq (unsigned int irq)
- {
- u64 crime_mask;
- unsigned long flags;
- save_and_cli (flags);
- crime_mask = crime_read_64 (CRIME_INT_MASK);
- crime_mask |= 1 << (irq - 1);
- crime_write_64 (CRIME_INT_MASK, crime_mask);
- restore_flags (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)
- {
- u64 crime_mask;
- unsigned long flags;
- save_and_cli (flags);
- crime_mask = crime_read_64 (CRIME_INT_MASK);
- crime_mask &= ~(1 << (irq - 1));
- crime_write_64 (CRIME_INT_MASK, crime_mask);
- restore_flags (flags);
- }
- static void mask_and_ack_crime_irq (unsigned int irq)
- {
- u64 crime_mask;
- 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)) {
- save_and_cli (flags);
- crime_mask = crime_read_64 (CRIME_HARD_INT);
- crime_mask &= ~(1 << (irq - 1));
- crime_write_64 (CRIME_HARD_INT, crime_mask);
- restore_flags (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 void enable_macepci_irq (unsigned int irq)
- {
- u32 mace_mask;
- u64 crime_mask;
- unsigned long flags;
- save_and_cli (flags);
- mace_mask = mace_read_32 (MACEPCI_CONTROL);
- mace_mask |= MACEPCI_CONTROL_INT (irq - 9);
- mace_write_32 (MACEPCI_CONTROL, mace_mask);
- /* In case the CRIME interrupt isn't enabled, we must enable it;
- * however, we never disable interrupts at that level.
- */
- crime_mask = crime_read_64 (CRIME_INT_MASK);
- crime_mask |= 1 << (irq - 1);
- crime_write_64 (CRIME_INT_MASK, crime_mask);
- restore_flags (flags);
- }
- static unsigned int startup_macepci_irq (unsigned int irq) {
- enable_macepci_irq (irq);
- return 0; /* XXX */
- }
- static void disable_macepci_irq (unsigned int irq)
- {
- u32 mace_mask;
- unsigned long flags;
- save_and_cli (flags);
- mace_mask = mace_read_32 (MACEPCI_CONTROL);
- mace_mask &= ~MACEPCI_CONTROL_INT (irq - 9);
- mace_write_32 (MACEPCI_CONTROL, mace_mask);
- restore_flags (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.
- */
- static void enable_maceisa_irq (unsigned int irq)
- {
- u64 crime_mask;
- u32 mace_mask;
- unsigned int crime_int = 0;
- unsigned long flags;
- DBG ("maceisa enable: %un", 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 %016lx enabledn", crime_int);
- save_and_cli (flags);
- crime_mask = crime_read_64 (CRIME_INT_MASK);
- crime_mask |= crime_int;
- crime_write_64 (CRIME_INT_MASK, crime_mask);
- mace_mask = mace_read_32 (MACEISA_INT_MASK);
- mace_mask |= 1 << (irq - 33);
- mace_write_32 (MACEISA_INT_MASK, mace_mask);
- restore_flags (flags);
- }
- static unsigned int startup_maceisa_irq (unsigned int irq) {
- enable_maceisa_irq (irq);
- return 0;
- }
- static void disable_maceisa_irq (unsigned int irq)
- {
- u32 mace_mask;
- unsigned long flags;
- save_and_cli (flags);
- mace_mask = mace_read_32 (MACEISA_INT_MASK);
- mace_mask &= ~(1 << (irq - 33));
- mace_write_32 (MACEISA_INT_MASK, mace_mask);
- restore_flags (flags);
- }
- static void mask_and_ack_maceisa_irq (unsigned int irq)
- {
- u32 mace_mask;
- unsigned long flags;
- switch (irq) {
- case MACEISA_PARALLEL_IRQ:
- case MACEISA_SERIAL1_TDMAPR_IRQ:
- case MACEISA_SERIAL2_TDMAPR_IRQ:
- save_and_cli (flags);
- mace_mask = mace_read_32 (MACEISA_INT_STAT);
- mace_mask &= ~(1 << (irq - 33));
- mace_write_32 (MACEISA_INT_STAT, mace_mask);
- restore_flags (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)
- {
- u64 crime_mask;
- unsigned long flags;
- save_and_cli (flags);
- crime_mask = crime_read_64 (CRIME_INT_MASK);
- crime_mask |= 1 << (irq - 1);
- crime_write_64 (CRIME_INT_MASK, crime_mask);
- restore_flags (flags);
- }
- static unsigned int startup_mace_irq (unsigned int irq)
- {
- enable_mace_irq (irq);
- return 0;
- }
- static void disable_mace_irq (unsigned int irq)
- {
- u64 crime_mask;
- unsigned long flags;
- save_and_cli (flags);
- crime_mask = crime_read_64 (CRIME_INT_MASK);
- crime_mask &= ~(1 << (irq - 1));
- crime_write_64 (CRIME_INT_MASK, crime_mask);
- restore_flags (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)
- {
- u64 crime;
- u32 mace;
-
- printk ("Unknown interrupt occurred!n");
- printk ("cp0_status: %08xtcp0_cause: %08xn",
- read_32bit_cp0_register (CP0_STATUS),
- read_32bit_cp0_register (CP0_CAUSE));
- crime = crime_read_64 (CRIME_INT_MASK);
- printk ("CRIME interrupt mask: %016lxn", crime);
- crime = crime_read_64 (CRIME_INT_STAT);
- printk ("CRIME interrupt status: %016lxn", crime);
- crime = crime_read_64 (CRIME_HARD_INT);
- printk ("CRIME hardware interrupt register: %016lxn", crime);
- mace = mace_read_32 (MACEISA_INT_MASK);
- printk ("MACE ISA interrupt mask: %08xn", mace);
- mace = mace_read_32 (MACEISA_INT_STAT);
- printk ("MACE ISA interrupt status: %08xn", mace);
- mace = mace_read_32 (MACEPCI_CONTROL);
- printk ("MACE PCI control register: %08xn", mace);
- printk ("Register dump:n");
- show_regs (regs);
- printk ("Please mail this report to linux-mips@oss.sgi.comn");
- printk ("Spinning...");
- while (1) ;
- }
- void __init ip32_irq_init(void)
- {
- unsigned int irq;
- extern void init_generic_irq (void);
-
- /* Install our interrupt handler, then clear and disable all
- * CRIME and MACE interrupts.
- */
- crime_write_64 (CRIME_INT_MASK, 0);
- crime_write_64 (CRIME_HARD_INT, 0);
- crime_write_64 (CRIME_SOFT_INT, 0);
- mace_write_32 (MACEISA_INT_STAT, 0);
- mace_write_32 (MACEISA_INT_MASK, 0);
- set_except_vector(0, ip32_handle_int);
- init_generic_irq ();
- for (irq = 0; irq <= IP32_IRQ_MAX; irq++) {
- hw_irq_controller *controller;
- if (irq == CLOCK_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);
- }
- /* CRIME 1.1 appears to deliver all interrupts to this one pin. */
- void ip32_irq0 (struct pt_regs *regs)
- {
- u64 crime_int = crime_read_64 (CRIME_INT_STAT);
- int irq = 0;
-
- if (crime_int & CRIME_MACE_INT_MASK) {
- crime_int &= CRIME_MACE_INT_MASK;
- irq = ffs (crime_int);
- } else if (crime_int & CRIME_MACEISA_INT_MASK) {
- u32 mace_int;
- mace_int = mace_read_32 (MACEISA_INT_STAT);
- if (mace_int == 0)
- irq = 0;
- else
- irq = ffs (mace_int) + 32;
- } else if (crime_int & CRIME_MACEPCI_INT_MASK) {
- crime_int &= CRIME_MACEPCI_INT_MASK;
- crime_int >>= 8;
- irq = ffs (crime_int) + 8;
- } else if (crime_int & 0xffff0000) {
- crime_int >>= 16;
- irq = ffs (crime_int) + 16;
- }
- if (irq == 0)
- ip32_unknown_interrupt (regs);
- 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)
- {
- do_IRQ (CLOCK_IRQ, regs);
- }