diff options
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/sun4c_irq.c | 81 |
1 files changed, 44 insertions, 37 deletions
diff --git a/arch/sparc/kernel/sun4c_irq.c b/arch/sparc/kernel/sun4c_irq.c index 892fb884910..f543b452ebc 100644 --- a/arch/sparc/kernel/sun4c_irq.c +++ b/arch/sparc/kernel/sun4c_irq.c @@ -1,5 +1,5 @@ -/* sun4c_irq.c - * arch/sparc/kernel/sun4c_irq.c: +/* + * sun4c irq support * * djhr: Hacked out of irq.c into a CPU dependent version. * @@ -9,31 +9,41 @@ * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk) */ -#include <linux/errno.h> -#include <linux/linkage.h> -#include <linux/kernel_stat.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/ptrace.h> -#include <linux/interrupt.h> #include <linux/init.h> -#include <linux/of.h> -#include <linux/of_device.h> -#include "irq.h" -#include <asm/ptrace.h> -#include <asm/processor.h> -#include <asm/system.h> -#include <asm/psr.h> -#include <asm/vaddrs.h> -#include <asm/timer.h> -#include <asm/openprom.h> #include <asm/oplib.h> -#include <asm/traps.h> +#include <asm/timer.h> #include <asm/irq.h> #include <asm/io.h> -#include <asm/idprom.h> -#include <asm/machines.h> + +#include "irq.h" + +/* Sun4c interrupts are typically laid out as follows: + * + * 1 - Software interrupt, SBUS level 1 + * 2 - SBUS level 2 + * 3 - ESP SCSI, SBUS level 3 + * 4 - Software interrupt + * 5 - Lance ethernet, SBUS level 4 + * 6 - Software interrupt + * 7 - Graphics card, SBUS level 5 + * 8 - SBUS level 6 + * 9 - SBUS level 7 + * 10 - Counter timer + * 11 - Floppy + * 12 - Zilog uart + * 13 - CS4231 audio + * 14 - Profiling timer + * 15 - NMI + * + * The interrupt enable bits in the interrupt mask register are + * really only used to enable/disable the timer interrupts, and + * for signalling software interrupts. There is also a master + * interrupt enable bit in this register. + * + * Interrupts are enabled by setting the SUN4C_INT_* bits, they + * are disabled by clearing those bits. + */ /* * Bit field defines for the interrupt registers on various @@ -49,26 +59,21 @@ #define SUN4C_INT_E4 0x04 /* Enable level 4 IRQ. */ #define SUN4C_INT_E1 0x02 /* Enable level 1 IRQ. */ -/* Pointer to the interrupt enable byte - * - * Dave Redman (djhr@tadpole.co.uk) - * What you may not be aware of is that entry.S requires this variable. - * - * --- linux_trap_nmi_sun4c -- - * - * so don't go making it static, like I tried. sigh. +/* + * Pointer to the interrupt enable byte + * Used by entry.S */ -unsigned char __iomem *interrupt_enable = NULL; +unsigned char __iomem *interrupt_enable; static void sun4c_disable_irq(unsigned int irq_nr) { unsigned long flags; unsigned char current_mask, new_mask; - + local_irq_save(flags); irq_nr &= (NR_IRQS - 1); current_mask = sbus_readb(interrupt_enable); - switch(irq_nr) { + switch (irq_nr) { case 1: new_mask = ((current_mask) & (~(SUN4C_INT_E1))); break; @@ -93,11 +98,11 @@ static void sun4c_enable_irq(unsigned int irq_nr) { unsigned long flags; unsigned char current_mask, new_mask; - + local_irq_save(flags); irq_nr &= (NR_IRQS - 1); current_mask = sbus_readb(interrupt_enable); - switch(irq_nr) { + switch (irq_nr) { case 1: new_mask = ((current_mask) | SUN4C_INT_E1); break; @@ -180,12 +185,14 @@ static void __init sun4c_init_timers(irq_handler_t counter_fn) prom_printf("sun4c_init_timers: request_irq() fails with %d\n", err); prom_halt(); } - + sun4c_disable_irq(irq[1].pri); } #ifdef CONFIG_SMP -static void sun4c_nop(void) {} +static void sun4c_nop(void) +{ +} #endif void __init sun4c_init_IRQ(void) |