diff options
Diffstat (limited to 'arch/arm26/machine/irq.c')
| -rw-r--r-- | arch/arm26/machine/irq.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/arch/arm26/machine/irq.c b/arch/arm26/machine/irq.c new file mode 100644 index 00000000000..4361863f7ed --- /dev/null +++ b/arch/arm26/machine/irq.c @@ -0,0 +1,165 @@ +/* + * linux/arch/arm26/mach-arc/irq.c + * + * Copyright (C) 1996 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Changelog: + * 24-09-1996 RMK Created + * 10-10-1996 RMK Brought up to date with arch-sa110eval + * 22-10-1996 RMK Changed interrupt numbers & uses new inb/outb macros + * 11-01-1998 RMK Added mask_and_ack_irq + * 22-08-1998 RMK Restructured IRQ routines + * 08-09-2002 IM Brought up to date for 2.5 + * 01-06-2003 JMA Removed arc_fiq_chip + */ +#include <linux/config.h> +#include <linux/init.h> + +#include <asm/irq.h> +#include <asm/irqchip.h> +#include <asm/ioc.h> +#include <asm/io.h> +#include <asm/system.h> + +extern void init_FIQ(void); + +#define a_clf() clf() +#define a_stf() stf() + +static void arc_ack_irq_a(unsigned int irq) +{ + unsigned int val, mask; + + mask = 1 << irq; + a_clf(); + val = ioc_readb(IOC_IRQMASKA); + ioc_writeb(val & ~mask, IOC_IRQMASKA); + ioc_writeb(mask, IOC_IRQCLRA); + a_stf(); +} + +static void arc_mask_irq_a(unsigned int irq) +{ + unsigned int val, mask; + + mask = 1 << irq; + a_clf(); + val = ioc_readb(IOC_IRQMASKA); + ioc_writeb(val & ~mask, IOC_IRQMASKA); + a_stf(); +} + +static void arc_unmask_irq_a(unsigned int irq) +{ + unsigned int val, mask; + + mask = 1 << irq; + a_clf(); + val = ioc_readb(IOC_IRQMASKA); + ioc_writeb(val | mask, IOC_IRQMASKA); + a_stf(); +} + +static struct irqchip arc_a_chip = { + .ack = arc_ack_irq_a, + .mask = arc_mask_irq_a, + .unmask = arc_unmask_irq_a, +}; + +static void arc_mask_irq_b(unsigned int irq) +{ + unsigned int val, mask; + mask = 1 << (irq & 7); + val = ioc_readb(IOC_IRQMASKB); + ioc_writeb(val & ~mask, IOC_IRQMASKB); +} + +static void arc_unmask_irq_b(unsigned int irq) +{ + unsigned int val, mask; + + mask = 1 << (irq & 7); + val = ioc_readb(IOC_IRQMASKB); + ioc_writeb(val | mask, IOC_IRQMASKB); +} + +static struct irqchip arc_b_chip = { + .ack = arc_mask_irq_b, + .mask = arc_mask_irq_b, + .unmask = arc_unmask_irq_b, +}; + +/* FIXME - JMA none of these functions are used in arm26 currently +static void arc_mask_irq_fiq(unsigned int irq) +{ + unsigned int val, mask; + + mask = 1 << (irq & 7); + val = ioc_readb(IOC_FIQMASK); + ioc_writeb(val & ~mask, IOC_FIQMASK); +} + +static void arc_unmask_irq_fiq(unsigned int irq) +{ + unsigned int val, mask; + + mask = 1 << (irq & 7); + val = ioc_readb(IOC_FIQMASK); + ioc_writeb(val | mask, IOC_FIQMASK); +} + +static struct irqchip arc_fiq_chip = { + .ack = arc_mask_irq_fiq, + .mask = arc_mask_irq_fiq, + .unmask = arc_unmask_irq_fiq, +}; +*/ + +void __init arc_init_irq(void) +{ + unsigned int irq, flags; + + /* Disable all IOC interrupt sources */ + ioc_writeb(0, IOC_IRQMASKA); + ioc_writeb(0, IOC_IRQMASKB); + ioc_writeb(0, IOC_FIQMASK); + + for (irq = 0; irq < NR_IRQS; irq++) { + flags = IRQF_VALID; + + if (irq <= 6 || (irq >= 9 && irq <= 15)) + flags |= IRQF_PROBE; + + if (irq == IRQ_KEYBOARDTX) + flags |= IRQF_NOAUTOEN; + + switch (irq) { + case 0 ... 7: + set_irq_chip(irq, &arc_a_chip); + set_irq_handler(irq, do_level_IRQ); + set_irq_flags(irq, flags); + break; + + case 8 ... 15: + set_irq_chip(irq, &arc_b_chip); + set_irq_handler(irq, do_level_IRQ); + set_irq_flags(irq, flags); + +/* case 64 ... 72: + set_irq_chip(irq, &arc_fiq_chip); + set_irq_flags(irq, flags); + break; +*/ + + } + } + + irq_desc[IRQ_KEYBOARDTX].noautoenable = 1; + + init_FIQ(); +} + |