arch/arm/mach-omap1/irq.c - linux - Git at Google

 /*
  * linux/arch/arm/mach-omap1/irq.c
  *
  * Interrupt handler for all OMAP boards
  *
  * Copyright (C) 2004 Nokia Corporation
  * Written by Tony Lindgren <tony@atomide.com>
  * Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
  *
  * 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 <glonnon@ridgerun.com>
  *
  * 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/gpio.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/io.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);
 	}
 }
	/*
	* linux/arch/arm/mach-omap1/irq.c
	*
	* Interrupt handler for all OMAP boards
	*
	* Copyright (C) 2004 Nokia Corporation
	* Written by Tony Lindgren <tony@atomide.com>
	* Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
	*
	* 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 <glonnon@ridgerun.com>
	*
	* 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/gpio.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/sched.h>
	#include <linux/interrupt.h>
	#include <linux/io.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);
	}
	}