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Diffstat (limited to 'arch/m68k/68000/ints.c')
| -rw-r--r-- | arch/m68k/68000/ints.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/m68k/68000/ints.c b/arch/m68k/68000/ints.c new file mode 100644 index 000000000..cda49b12d --- /dev/null +++ b/arch/m68k/68000/ints.c @@ -0,0 +1,186 @@ +/* + * ints.c - Generic interrupt controller support + * + * 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 1996 Roman Zippel + * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com> + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <asm/traps.h> +#include <asm/io.h> +#include <asm/machdep.h> + +#if defined(CONFIG_M68328) +#include <asm/MC68328.h> +#elif defined(CONFIG_M68EZ328) +#include <asm/MC68EZ328.h> +#elif defined(CONFIG_M68VZ328) +#include <asm/MC68VZ328.h> +#endif + +/* assembler routines */ +asmlinkage void system_call(void); +asmlinkage void buserr(void); +asmlinkage void trap(void); +asmlinkage void trap3(void); +asmlinkage void trap4(void); +asmlinkage void trap5(void); +asmlinkage void trap6(void); +asmlinkage void trap7(void); +asmlinkage void trap8(void); +asmlinkage void trap9(void); +asmlinkage void trap10(void); +asmlinkage void trap11(void); +asmlinkage void trap12(void); +asmlinkage void trap13(void); +asmlinkage void trap14(void); +asmlinkage void trap15(void); +asmlinkage void trap33(void); +asmlinkage void trap34(void); +asmlinkage void trap35(void); +asmlinkage void trap36(void); +asmlinkage void trap37(void); +asmlinkage void trap38(void); +asmlinkage void trap39(void); +asmlinkage void trap40(void); +asmlinkage void trap41(void); +asmlinkage void trap42(void); +asmlinkage void trap43(void); +asmlinkage void trap44(void); +asmlinkage void trap45(void); +asmlinkage void trap46(void); +asmlinkage void trap47(void); +asmlinkage irqreturn_t bad_interrupt(int, void *); +asmlinkage irqreturn_t inthandler(void); +asmlinkage irqreturn_t inthandler1(void); +asmlinkage irqreturn_t inthandler2(void); +asmlinkage irqreturn_t inthandler3(void); +asmlinkage irqreturn_t inthandler4(void); +asmlinkage irqreturn_t inthandler5(void); +asmlinkage irqreturn_t inthandler6(void); +asmlinkage irqreturn_t inthandler7(void); + +/* The 68k family did not have a good way to determine the source + * of interrupts until later in the family. The EC000 core does + * not provide the vector number on the stack, we vector everything + * into one vector and look in the blasted mask register... + * This code is designed to be fast, almost constant time, not clean! + */ +void process_int(int vec, struct pt_regs *fp) +{ + int irq; + int mask; + + unsigned long pend = ISR; + + while (pend) { + if (pend & 0x0000ffff) { + if (pend & 0x000000ff) { + if (pend & 0x0000000f) { + mask = 0x00000001; + irq = 0; + } else { + mask = 0x00000010; + irq = 4; + } + } else { + if (pend & 0x00000f00) { + mask = 0x00000100; + irq = 8; + } else { + mask = 0x00001000; + irq = 12; + } + } + } else { + if (pend & 0x00ff0000) { + if (pend & 0x000f0000) { + mask = 0x00010000; + irq = 16; + } else { + mask = 0x00100000; + irq = 20; + } + } else { + if (pend & 0x0f000000) { + mask = 0x01000000; + irq = 24; + } else { + mask = 0x10000000; + irq = 28; + } + } + } + + while (! (mask & pend)) { + mask <<=1; + irq++; + } + + do_IRQ(irq, fp); + pend &= ~mask; + } +} + +static void intc_irq_unmask(struct irq_data *d) +{ + IMR &= ~(1 << d->irq); +} + +static void intc_irq_mask(struct irq_data *d) +{ + IMR |= (1 << d->irq); +} + +static struct irq_chip intc_irq_chip = { + .name = "M68K-INTC", + .irq_mask = intc_irq_mask, + .irq_unmask = intc_irq_unmask, +}; + +/* + * This function should be called during kernel startup to initialize + * the machine vector table. + */ +void __init trap_init(void) +{ + int i; + + /* set up the vectors */ + for (i = 72; i < 256; ++i) + _ramvec[i] = (e_vector) bad_interrupt; + + _ramvec[32] = system_call; + + _ramvec[65] = (e_vector) inthandler1; + _ramvec[66] = (e_vector) inthandler2; + _ramvec[67] = (e_vector) inthandler3; + _ramvec[68] = (e_vector) inthandler4; + _ramvec[69] = (e_vector) inthandler5; + _ramvec[70] = (e_vector) inthandler6; + _ramvec[71] = (e_vector) inthandler7; +} + +void __init init_IRQ(void) +{ + int i; + + IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */ + + /* turn off all interrupts */ + IMR = ~0; + + for (i = 0; (i < NR_IRQS); i++) { + irq_set_chip(i, &intc_irq_chip); + irq_set_handler(i, handle_level_irq); + } +} + |