irq.c
3.62 KB
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/*
* Interrupt handler for DaVinci boards.
*
* Copyright (C) 2006 Texas Instruments.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/cputype.h>
#include <mach/common.h>
#include <asm/mach/irq.h>
#define FIQ_REG0_OFFSET 0x0000
#define FIQ_REG1_OFFSET 0x0004
#define IRQ_REG0_OFFSET 0x0008
#define IRQ_REG1_OFFSET 0x000C
#define IRQ_ENT_REG0_OFFSET 0x0018
#define IRQ_ENT_REG1_OFFSET 0x001C
#define IRQ_INCTL_REG_OFFSET 0x0020
#define IRQ_EABASE_REG_OFFSET 0x0024
#define IRQ_INTPRI0_REG_OFFSET 0x0030
#define IRQ_INTPRI7_REG_OFFSET 0x004C
static inline void davinci_irq_writel(unsigned long value, int offset)
{
__raw_writel(value, davinci_intc_base + offset);
}
static __init void
davinci_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
gc = irq_alloc_generic_chip("AINTC", 1, irq_start, base, handle_edge_irq);
if (!gc) {
pr_err("%s: irq_alloc_generic_chip for IRQ %u failed\n",
__func__, irq_start);
return;
}
ct = gc->chip_types;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->chip.irq_mask = irq_gc_mask_clr_bit;
ct->chip.irq_unmask = irq_gc_mask_set_bit;
ct->regs.ack = IRQ_REG0_OFFSET;
ct->regs.mask = IRQ_ENT_REG0_OFFSET;
irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
}
/* ARM Interrupt Controller Initialization */
void __init davinci_irq_init(void)
{
unsigned i, j;
const u8 *davinci_def_priorities = davinci_soc_info.intc_irq_prios;
davinci_intc_type = DAVINCI_INTC_TYPE_AINTC;
davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_4K);
if (WARN_ON(!davinci_intc_base))
return;
/* Clear all interrupt requests */
davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
/* Disable all interrupts */
davinci_irq_writel(0x0, IRQ_ENT_REG0_OFFSET);
davinci_irq_writel(0x0, IRQ_ENT_REG1_OFFSET);
/* Interrupts disabled immediately, IRQ entry reflects all */
davinci_irq_writel(0x0, IRQ_INCTL_REG_OFFSET);
/* we don't use the hardware vector table, just its entry addresses */
davinci_irq_writel(0, IRQ_EABASE_REG_OFFSET);
/* Clear all interrupt requests */
davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
for (i = IRQ_INTPRI0_REG_OFFSET; i <= IRQ_INTPRI7_REG_OFFSET; i += 4) {
u32 pri;
for (j = 0, pri = 0; j < 32; j += 4, davinci_def_priorities++)
pri |= (*davinci_def_priorities & 0x07) << j;
davinci_irq_writel(pri, i);
}
for (i = 0, j = 0; i < davinci_soc_info.intc_irq_num; i += 32, j += 0x04)
davinci_alloc_gc(davinci_intc_base + j, i, 32);
irq_set_handler(IRQ_TINT1_TINT34, handle_level_irq);
}