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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 <linux/irqdomain.h>
#include <mach/hardware.h>
#include <mach/cputype.h>
#include <mach/common.h>
#include <asm/mach/irq.h>
#include <asm/exception.h>
#include "irqs.h"
#define FIQ_REG0_OFFSET 0x0000
#define FIQ_REG1_OFFSET 0x0004
#define IRQ_REG0_OFFSET 0x0008
#define IRQ_REG1_OFFSET 0x000C
#define IRQ_IRQENTRY_OFFSET 0x0014
#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 void __iomem *davinci_intc_base;
static struct irq_domain *davinci_irq_domain;
static inline void davinci_irq_writel(unsigned long value, int offset)
{
__raw_writel(value, davinci_intc_base + offset);
}
static inline unsigned long davinci_irq_readl(int offset)
{
return readl_relaxed(davinci_intc_base + offset);
}
static __init void
davinci_irq_setup_gc(void __iomem *base,
unsigned int irq_start, unsigned int num)
{
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
gc = irq_get_domain_generic_chip(davinci_irq_domain, irq_start);
gc->reg_base = base;
gc->irq_base = irq_start;
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);
}
static asmlinkage void __exception_irq_entry
davinci_handle_irq(struct pt_regs *regs)
{
int irqnr = davinci_irq_readl(IRQ_IRQENTRY_OFFSET);
/*
* Use the formula for entry vector index generation from section
* 8.3.3 of the manual.
*/
irqnr >>= 2;
irqnr -= 1;
handle_domain_irq(davinci_irq_domain, irqnr, regs);
}
/* ARM Interrupt Controller Initialization */
void __init davinci_irq_init(void)
{
unsigned i, j;
const u8 *davinci_def_priorities = davinci_soc_info.intc_irq_prios;
int ret, irq_base;
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);
}
irq_base = irq_alloc_descs(-1, 0, davinci_soc_info.intc_irq_num, 0);
if (WARN_ON(irq_base < 0))
return;
davinci_irq_domain = irq_domain_add_legacy(NULL,
davinci_soc_info.intc_irq_num,
irq_base, 0, &irq_domain_simple_ops,
NULL);
if (WARN_ON(!davinci_irq_domain))
return;
ret = irq_alloc_domain_generic_chips(davinci_irq_domain, 32, 1,
"AINTC", handle_edge_irq,
IRQ_NOREQUEST | IRQ_NOPROBE, 0, 0);
if (WARN_ON(ret))
return;
for (i = 0, j = 0; i < davinci_soc_info.intc_irq_num; i += 32, j += 0x04)
davinci_irq_setup_gc(davinci_intc_base + j, irq_base + i, 32);
irq_set_handler(DAVINCI_INTC_IRQ(IRQ_TINT1_TINT34), handle_level_irq);
set_handle_irq(davinci_handle_irq);
}
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