/*
* linux/arch/arm/mach-omap1/irq.c
*
* Interrupt handler for all OMAP boards
*
* Copyright (C) 2004 Nokia Corporation
* Written by Tony Lindgren <[email protected]>
* Major cleanups by Juha Yrjölä <[email protected]>
*
* Completely re-written to support various OMAP chips with bank specific
* interrupt handlers.
*
* Some snippets of the code taken from the older OMAP interrupt handler
* Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <[email protected]>
*
* GPIO interrupt handler moved to gpio.c by Juha Yrjola
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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/init.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqdomain.h>
#include <asm/irq.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>
#include "soc.h"
#include "hardware.h"
#include "common.h"
#define IRQ_BANK(irq) ((irq) >> 5)
#define IRQ_BIT(irq) ((irq) & 0x1f)
struct omap_irq_bank {
unsigned long base_reg;
void __iomem *va;
unsigned long trigger_map;
unsigned long wake_enable;
};
static u32 omap_l2_irq;
static unsigned int irq_bank_count;
static struct omap_irq_bank *irq_banks;
static struct irq_domain *domain;
static inline unsigned int irq_bank_readl(int bank, int offset)
{
return readl_relaxed(irq_banks[bank].va + offset);
}
static inline void irq_bank_writel(unsigned long value, int bank, int offset)
{
writel_relaxed(value, irq_banks[bank].va + offset);
}
static void omap_ack_irq(int irq)
{
if (irq > 31)
writel_relaxed(0x1, irq_banks[1].va + IRQ_CONTROL_REG_OFFSET);
writel_relaxed(0x1, irq_banks[0].va + IRQ_CONTROL_REG_OFFSET);
}
static void omap_mask_ack_irq(struct irq_data *d)
{
struct irq_chip_type *ct = irq_data_get_chip_type(d);
ct->chip.irq_mask(d);
omap_ack_irq(d->irq);
}
/*
* Allows tuning the IRQ type and priority
*
* NOTE: There is currently no OMAP fiq handler for Linux. Read the
* mailing list threads on FIQ handlers if you are planning to
* add a FIQ handler for OMAP.
*/
static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
{
signed int bank;
unsigned long val, offset;
bank = IRQ_BANK(irq);
/* FIQ is only available on bank 0 interrupts */
fiq = bank ? 0 : (fiq & 0x1);
val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
irq_bank_writel(val, bank, offset);
}
#ifdef CONFIG_ARCH_OMAP15XX
static struct omap_irq_bank omap1510_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3febfff },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0xffbfffed },
};
static struct omap_irq_bank omap310_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3faefc3 },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0x65b3c061 },
};
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
static struct omap_irq_bank omap1610_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3fefe8f },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0xfdb7c1fd },
{ .base_reg = OMAP_IH2_BASE + 0x100, .trigger_map = 0xffffb7ff },
{ .base_reg = OMAP_IH2_BASE + 0x200, .trigger_map = 0xffffffff },
};
#endif
asmlinkage void __exception_irq_entry omap1_handle_irq(struct pt_regs *regs)
{
void __iomem *l1 = irq_banks[0].va;
void __iomem *l2 = irq_banks[1].va;
u32 irqnr;
do {
irqnr = readl_relaxed(l1 + IRQ_ITR_REG_OFFSET);
irqnr &= ~(readl_relaxed(l1 + IRQ_MIR_REG_OFFSET) & 0xffffffff);
if (!irqnr)
break;
irqnr = readl_relaxed(l1 + IRQ_SIR_FIQ_REG_OFFSET);
if (irqnr)
goto irq;
irqnr = readl_relaxed(l1 + IRQ_SIR_IRQ_REG_OFFSET);
if (irqnr == omap_l2_irq) {
irqnr = readl_relaxed(l2 + IRQ_SIR_IRQ_REG_OFFSET);
if (irqnr)
irqnr += 32;
}
irq:
if (irqnr)
generic_handle_domain_irq(domain, irqnr);
else
break;
} while (irqnr);
}
static __init void
omap_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("MPU", 1, irq_start, base,
handle_level_irq);
ct = gc->chip_types;
ct->chip.irq_ack = omap_mask_ack_irq;
ct->chip.irq_mask = irq_gc_mask_set_bit;
ct->chip.irq_unmask = irq_gc_mask_clr_bit;
ct->chip.irq_set_wake = irq_gc_set_wake;
ct->regs.mask = IRQ_MIR_REG_OFFSET;
irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
}
void __init omap1_init_irq(void)
{
struct irq_chip_type *ct;
struct irq_data *d = NULL;
int i, j, irq_base;
unsigned long nr_irqs;
#ifdef CONFIG_ARCH_OMAP15XX
if (cpu_is_omap1510()) {
irq_banks = omap1510_irq_banks;
irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
}
if (cpu_is_omap310()) {
irq_banks = omap310_irq_banks;
irq_bank_count = ARRAY_SIZE(omap310_irq_banks);
}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if (cpu_is_omap16xx()) {
irq_banks = omap1610_irq_banks;
irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
}
#endif
for (i = 0; i < irq_bank_count; i++) {
irq_banks[i].va = ioremap(irq_banks[i].base_reg, 0xff);
if (WARN_ON(!irq_banks[i].va))
return;
}
nr_irqs = irq_bank_count * 32;
irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
if (irq_base < 0) {
pr_warn("Couldn't allocate IRQ numbers\n");
irq_base = 0;
}
omap_l2_irq = irq_base;
omap_l2_irq -= NR_IRQS_LEGACY;
domain = irq_domain_add_legacy(NULL, nr_irqs, irq_base, 0,
&irq_domain_simple_ops, NULL);
pr_info("Total of %lu interrupts in %i interrupt banks\n",
nr_irqs, irq_bank_count);
/* Mask and clear all interrupts */
for (i = 0; i < irq_bank_count; i++) {
irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
}
/* Clear any pending interrupts */
irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
/* Install the interrupt handlers for each bank */
for (i = 0; i < irq_bank_count; i++) {
for (j = i * 32; j < (i + 1) * 32; j++) {
int irq_trigger;
irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
omap_irq_set_cfg(j, 0, 0, irq_trigger);
irq_clear_status_flags(j, IRQ_NOREQUEST);
}
omap_alloc_gc(irq_banks[i].va, irq_base + i * 32, 32);
}
/* Unmask level 2 handler */
d = irq_get_irq_data(irq_find_mapping(domain, omap_l2_irq));
if (d) {
ct = irq_data_get_chip_type(d);
ct->chip.irq_unmask(d);
}
set_handle_irq(omap1_handle_irq);
}
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