From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/arm/mach-iop3xx/iop331-irq.c | 127 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 arch/arm/mach-iop3xx/iop331-irq.c (limited to 'arch/arm/mach-iop3xx/iop331-irq.c') diff --git a/arch/arm/mach-iop3xx/iop331-irq.c b/arch/arm/mach-iop3xx/iop331-irq.c new file mode 100644 index 00000000000..f4d4321737a --- /dev/null +++ b/arch/arm/mach-iop3xx/iop331-irq.c @@ -0,0 +1,127 @@ +/* + * linux/arch/arm/mach-iop3xx/iop331-irq.c + * + * Generic IOP331 IRQ handling functionality + * + * Author: Dave Jiang + * Copyright (C) 2003 Intel Corp. + * + * 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. + * + * + */ +#include +#include +#include + +#include +#include +#include + +#include + +static u32 iop331_mask0 = 0; +static u32 iop331_mask1 = 0; + +static inline void intctl_write0(u32 val) +{ + // INTCTL0 + asm volatile("mcr p6,0,%0,c0,c0,0"::"r" (val)); +} + +static inline void intctl_write1(u32 val) +{ + // INTCTL1 + asm volatile("mcr p6,0,%0,c1,c0,0"::"r" (val)); +} + +static inline void intstr_write0(u32 val) +{ + // INTSTR0 + asm volatile("mcr p6,0,%0,c2,c0,0"::"r" (val)); +} + +static inline void intstr_write1(u32 val) +{ + // INTSTR1 + asm volatile("mcr p6,0,%0,c3,c0,0"::"r" (val)); +} + +static void +iop331_irq_mask1 (unsigned int irq) +{ + iop331_mask0 &= ~(1 << (irq - IOP331_IRQ_OFS)); + intctl_write0(iop331_mask0); +} + +static void +iop331_irq_mask2 (unsigned int irq) +{ + iop331_mask1 &= ~(1 << (irq - IOP331_IRQ_OFS - 32)); + intctl_write1(iop331_mask1); +} + +static void +iop331_irq_unmask1(unsigned int irq) +{ + iop331_mask0 |= (1 << (irq - IOP331_IRQ_OFS)); + intctl_write0(iop331_mask0); +} + +static void +iop331_irq_unmask2(unsigned int irq) +{ + iop331_mask1 |= (1 << (irq - IOP331_IRQ_OFS - 32)); + intctl_write1(iop331_mask1); +} + +struct irqchip iop331_irqchip1 = { + .ack = iop331_irq_mask1, + .mask = iop331_irq_mask1, + .unmask = iop331_irq_unmask1, +}; + +struct irqchip iop331_irqchip2 = { + .ack = iop331_irq_mask2, + .mask = iop331_irq_mask2, + .unmask = iop331_irq_unmask2, +}; + +void __init iop331_init_irq(void) +{ + unsigned int i, tmp; + + /* Enable access to coprocessor 6 for dealing with IRQs. + * From RMK: + * Basically, the Intel documentation here is poor. It appears that + * you need to set the bit to be able to access the coprocessor from + * SVC mode. Whether that allows access from user space or not is + * unclear. + */ + asm volatile ( + "mrc p15, 0, %0, c15, c1, 0\n\t" + "orr %0, %0, %1\n\t" + "mcr p15, 0, %0, c15, c1, 0\n\t" + /* The action is delayed, so we have to do this: */ + "mrc p15, 0, %0, c15, c1, 0\n\t" + "mov %0, %0\n\t" + "sub pc, pc, #4" + : "=r" (tmp) : "i" (1 << 6) ); + + intctl_write0(0); // disable all interrupts + intctl_write1(0); + intstr_write0(0); // treat all as IRQ + intstr_write1(0); + if(machine_is_iq80331()) // all interrupts are inputs to chip + *IOP331_PCIIRSR = 0x0f; + + for(i = IOP331_IRQ_OFS; i < NR_IOP331_IRQS; i++) + { + set_irq_chip(i, (i < 32) ? &iop331_irqchip1 : &iop331_irqchip2); + set_irq_handler(i, do_level_IRQ); + set_irq_flags(i, IRQF_VALID | IRQF_PROBE); + } +} + -- cgit v1.2.3