arch/arm/mach-at91/irq.c - maze/linux - Git at Google

 /*
  * linux/arch/arm/mach-at91/irq.c
  *
  *  Copyright (C) 2004 SAN People
  *  Copyright (C) 2004 ATMEL
  *  Copyright (C) Rick Bronson
  *
  * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/types.h>
 #include <linux/irq.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/err.h>

 #include <mach/hardware.h>
 #include <asm/irq.h>
 #include <asm/setup.h>

 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/map.h>

 void __iomem *at91_aic_base;
 static struct irq_domain *at91_aic_domain;
 static struct device_node *at91_aic_np;

 static void at91_aic_mask_irq(struct irq_data *d)
 {
 	/* Disable interrupt on AIC */
 	at91_aic_write(AT91_AIC_IDCR, 1 << d->hwirq);
 }

 static void at91_aic_unmask_irq(struct irq_data *d)
 {
 	/* Enable interrupt on AIC */
 	at91_aic_write(AT91_AIC_IECR, 1 << d->hwirq);
 }

 unsigned int at91_extern_irq;

 #define is_extern_irq(hwirq) ((1 << (hwirq)) & at91_extern_irq)

 static int at91_aic_set_type(struct irq_data *d, unsigned type)
 {
 	unsigned int smr, srctype;

 	switch (type) {
 	case IRQ_TYPE_LEVEL_HIGH:
 		srctype = AT91_AIC_SRCTYPE_HIGH;
 		break;
 	case IRQ_TYPE_EDGE_RISING:
 		srctype = AT91_AIC_SRCTYPE_RISING;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		if ((d->hwirq == AT91_ID_FIQ) || is_extern_irq(d->hwirq))		/* only supported on external interrupts */
 			srctype = AT91_AIC_SRCTYPE_LOW;
 		else
 			return -EINVAL;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		if ((d->hwirq == AT91_ID_FIQ) || is_extern_irq(d->hwirq))		/* only supported on external interrupts */
 			srctype = AT91_AIC_SRCTYPE_FALLING;
 		else
 			return -EINVAL;
 		break;
 	default:
 		return -EINVAL;
 	}

 	smr = at91_aic_read(AT91_AIC_SMR(d->hwirq)) & ~AT91_AIC_SRCTYPE;
 	at91_aic_write(AT91_AIC_SMR(d->hwirq), smr | srctype);
 	return 0;
 }

 #ifdef CONFIG_PM

 static u32 wakeups;
 static u32 backups;

 static int at91_aic_set_wake(struct irq_data *d, unsigned value)
 {
 	if (unlikely(d->hwirq >= NR_AIC_IRQS))
 		return -EINVAL;

 	if (value)
 		wakeups |= (1 << d->hwirq);
 	else
 		wakeups &= ~(1 << d->hwirq);

 	return 0;
 }

 void at91_irq_suspend(void)
 {
 	backups = at91_aic_read(AT91_AIC_IMR);
 	at91_aic_write(AT91_AIC_IDCR, backups);
 	at91_aic_write(AT91_AIC_IECR, wakeups);
 }

 void at91_irq_resume(void)
 {
 	at91_aic_write(AT91_AIC_IDCR, wakeups);
 	at91_aic_write(AT91_AIC_IECR, backups);
 }

 #else
 #define at91_aic_set_wake	NULL
 #endif

 static struct irq_chip at91_aic_chip = {
 	.name		= "AIC",
 	.irq_ack	= at91_aic_mask_irq,
 	.irq_mask	= at91_aic_mask_irq,
 	.irq_unmask	= at91_aic_unmask_irq,
 	.irq_set_type	= at91_aic_set_type,
 	.irq_set_wake	= at91_aic_set_wake,
 };

 static void __init at91_aic_hw_init(unsigned int spu_vector)
 {
 	int i;

 	/*
 	 * Perform 8 End Of Interrupt Command to make sure AIC
 	 * will not Lock out nIRQ
 	 */
 	for (i = 0; i < 8; i++)
 		at91_aic_write(AT91_AIC_EOICR, 0);

 	/*
 	 * Spurious Interrupt ID in Spurious Vector Register.
 	 * When there is no current interrupt, the IRQ Vector Register
 	 * reads the value stored in AIC_SPU
 	 */
 	at91_aic_write(AT91_AIC_SPU, spu_vector);

 	/* No debugging in AIC: Debug (Protect) Control Register */
 	at91_aic_write(AT91_AIC_DCR, 0);

 	/* Disable and clear all interrupts initially */
 	at91_aic_write(AT91_AIC_IDCR, 0xFFFFFFFF);
 	at91_aic_write(AT91_AIC_ICCR, 0xFFFFFFFF);
 }

 #if defined(CONFIG_OF)
 static int at91_aic_irq_map(struct irq_domain *h, unsigned int virq,
 							irq_hw_number_t hw)
 {
 	/* Put virq number in Source Vector Register */
 	at91_aic_write(AT91_AIC_SVR(hw), virq);

 	/* Active Low interrupt, without priority */
 	at91_aic_write(AT91_AIC_SMR(hw), AT91_AIC_SRCTYPE_LOW);

 	irq_set_chip_and_handler(virq, &at91_aic_chip, handle_level_irq);
 	set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);

 	return 0;
 }

 static struct irq_domain_ops at91_aic_irq_ops = {
 	.map	= at91_aic_irq_map,
 	.xlate	= irq_domain_xlate_twocell,
 };

 int __init at91_aic_of_init(struct device_node *node,
 				     struct device_node *parent)
 {
 	at91_aic_base = of_iomap(node, 0);
 	at91_aic_np = node;

 	at91_aic_domain = irq_domain_add_linear(at91_aic_np, NR_AIC_IRQS,
 						&at91_aic_irq_ops, NULL);
 	if (!at91_aic_domain)
 		panic("Unable to add AIC irq domain (DT)\n");

 	irq_set_default_host(at91_aic_domain);

 	at91_aic_hw_init(NR_AIC_IRQS);

 	return 0;
 }
 #endif

 /*
  * Initialize the AIC interrupt controller.
  */
 void __init at91_aic_init(unsigned int priority[NR_AIC_IRQS])
 {
 	unsigned int i;
 	int irq_base;

 	at91_aic_base = ioremap(AT91_AIC, 512);
 	if (!at91_aic_base)
 		panic("Unable to ioremap AIC registers\n");

 	/* Add irq domain for AIC */
 	irq_base = irq_alloc_descs(-1, 0, NR_AIC_IRQS, 0);
 	if (irq_base < 0) {
 		WARN(1, "Cannot allocate irq_descs, assuming pre-allocated\n");
 		irq_base = 0;
 	}
 	at91_aic_domain = irq_domain_add_legacy(at91_aic_np, NR_AIC_IRQS,
 						irq_base, 0,
 						&irq_domain_simple_ops, NULL);

 	if (!at91_aic_domain)
 		panic("Unable to add AIC irq domain\n");

 	irq_set_default_host(at91_aic_domain);

 	/*
 	 * The IVR is used by macro get_irqnr_and_base to read and verify.
 	 * The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
 	 */
 	for (i = 0; i < NR_AIC_IRQS; i++) {
 		/* Put hardware irq number in Source Vector Register: */
 		at91_aic_write(AT91_AIC_SVR(i), i);
 		/* Active Low interrupt, with the specified priority */
 		at91_aic_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);

 		irq_set_chip_and_handler(i, &at91_aic_chip, handle_level_irq);
 		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 	}

 	at91_aic_hw_init(NR_AIC_IRQS);
 }
	/*
	* linux/arch/arm/mach-at91/irq.c
	*
	* Copyright (C) 2004 SAN People
	* Copyright (C) 2004 ATMEL
	* Copyright (C) Rick Bronson
	*
	* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/types.h>
	#include <linux/irq.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/irqdomain.h>
	#include <linux/err.h>

	#include <mach/hardware.h>
	#include <asm/irq.h>
	#include <asm/setup.h>

	#include <asm/mach/arch.h>
	#include <asm/mach/irq.h>
	#include <asm/mach/map.h>

	void __iomem *at91_aic_base;
	static struct irq_domain *at91_aic_domain;
	static struct device_node *at91_aic_np;

	static void at91_aic_mask_irq(struct irq_data *d)
	{
	/* Disable interrupt on AIC */
	at91_aic_write(AT91_AIC_IDCR, 1 << d->hwirq);
	}

	static void at91_aic_unmask_irq(struct irq_data *d)
	{
	/* Enable interrupt on AIC */
	at91_aic_write(AT91_AIC_IECR, 1 << d->hwirq);
	}

	unsigned int at91_extern_irq;

	#define is_extern_irq(hwirq) ((1 << (hwirq)) & at91_extern_irq)

	static int at91_aic_set_type(struct irq_data *d, unsigned type)
	{
	unsigned int smr, srctype;

	switch (type) {
	case IRQ_TYPE_LEVEL_HIGH:
	srctype = AT91_AIC_SRCTYPE_HIGH;
	break;
	case IRQ_TYPE_EDGE_RISING:
	srctype = AT91_AIC_SRCTYPE_RISING;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	if ((d->hwirq == AT91_ID_FIQ) \|\| is_extern_irq(d->hwirq)) /* only supported on external interrupts */
	srctype = AT91_AIC_SRCTYPE_LOW;
	else
	return -EINVAL;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	if ((d->hwirq == AT91_ID_FIQ) \|\| is_extern_irq(d->hwirq)) /* only supported on external interrupts */
	srctype = AT91_AIC_SRCTYPE_FALLING;
	else
	return -EINVAL;
	break;
	default:
	return -EINVAL;
	}

	smr = at91_aic_read(AT91_AIC_SMR(d->hwirq)) & ~AT91_AIC_SRCTYPE;
	at91_aic_write(AT91_AIC_SMR(d->hwirq), smr \| srctype);
	return 0;
	}

	#ifdef CONFIG_PM

	static u32 wakeups;
	static u32 backups;

	static int at91_aic_set_wake(struct irq_data *d, unsigned value)
	{
	if (unlikely(d->hwirq >= NR_AIC_IRQS))
	return -EINVAL;

	if (value)
	wakeups \|= (1 << d->hwirq);
	else
	wakeups &= ~(1 << d->hwirq);

	return 0;
	}

	void at91_irq_suspend(void)
	{
	backups = at91_aic_read(AT91_AIC_IMR);
	at91_aic_write(AT91_AIC_IDCR, backups);
	at91_aic_write(AT91_AIC_IECR, wakeups);
	}

	void at91_irq_resume(void)
	{
	at91_aic_write(AT91_AIC_IDCR, wakeups);
	at91_aic_write(AT91_AIC_IECR, backups);
	}

	#else
	#define at91_aic_set_wake NULL
	#endif

	static struct irq_chip at91_aic_chip = {
	.name = "AIC",
	.irq_ack = at91_aic_mask_irq,
	.irq_mask = at91_aic_mask_irq,
	.irq_unmask = at91_aic_unmask_irq,
	.irq_set_type = at91_aic_set_type,
	.irq_set_wake = at91_aic_set_wake,
	};

	static void __init at91_aic_hw_init(unsigned int spu_vector)
	{
	int i;

	/*
	* Perform 8 End Of Interrupt Command to make sure AIC
	* will not Lock out nIRQ
	*/
	for (i = 0; i < 8; i++)
	at91_aic_write(AT91_AIC_EOICR, 0);

	/*
	* Spurious Interrupt ID in Spurious Vector Register.
	* When there is no current interrupt, the IRQ Vector Register
	* reads the value stored in AIC_SPU
	*/
	at91_aic_write(AT91_AIC_SPU, spu_vector);

	/* No debugging in AIC: Debug (Protect) Control Register */
	at91_aic_write(AT91_AIC_DCR, 0);

	/* Disable and clear all interrupts initially */
	at91_aic_write(AT91_AIC_IDCR, 0xFFFFFFFF);
	at91_aic_write(AT91_AIC_ICCR, 0xFFFFFFFF);
	}

	#if defined(CONFIG_OF)
	static int at91_aic_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	/* Put virq number in Source Vector Register */
	at91_aic_write(AT91_AIC_SVR(hw), virq);

	/* Active Low interrupt, without priority */
	at91_aic_write(AT91_AIC_SMR(hw), AT91_AIC_SRCTYPE_LOW);

	irq_set_chip_and_handler(virq, &at91_aic_chip, handle_level_irq);
	set_irq_flags(virq, IRQF_VALID \| IRQF_PROBE);

	return 0;
	}

	static struct irq_domain_ops at91_aic_irq_ops = {
	.map = at91_aic_irq_map,
	.xlate = irq_domain_xlate_twocell,
	};

	int __init at91_aic_of_init(struct device_node *node,
	struct device_node *parent)
	{
	at91_aic_base = of_iomap(node, 0);
	at91_aic_np = node;

	at91_aic_domain = irq_domain_add_linear(at91_aic_np, NR_AIC_IRQS,
	&at91_aic_irq_ops, NULL);
	if (!at91_aic_domain)
	panic("Unable to add AIC irq domain (DT)\n");

	irq_set_default_host(at91_aic_domain);

	at91_aic_hw_init(NR_AIC_IRQS);

	return 0;
	}
	#endif

	/*
	* Initialize the AIC interrupt controller.
	*/
	void __init at91_aic_init(unsigned int priority[NR_AIC_IRQS])
	{
	unsigned int i;
	int irq_base;

	at91_aic_base = ioremap(AT91_AIC, 512);
	if (!at91_aic_base)
	panic("Unable to ioremap AIC registers\n");

	/* Add irq domain for AIC */
	irq_base = irq_alloc_descs(-1, 0, NR_AIC_IRQS, 0);
	if (irq_base < 0) {
	WARN(1, "Cannot allocate irq_descs, assuming pre-allocated\n");
	irq_base = 0;
	}
	at91_aic_domain = irq_domain_add_legacy(at91_aic_np, NR_AIC_IRQS,
	irq_base, 0,
	&irq_domain_simple_ops, NULL);

	if (!at91_aic_domain)
	panic("Unable to add AIC irq domain\n");

	irq_set_default_host(at91_aic_domain);

	/*
	* The IVR is used by macro get_irqnr_and_base to read and verify.
	* The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
	*/
	for (i = 0; i < NR_AIC_IRQS; i++) {
	/* Put hardware irq number in Source Vector Register: */
	at91_aic_write(AT91_AIC_SVR(i), i);
	/* Active Low interrupt, with the specified priority */
	at91_aic_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW \| priority[i]);

	irq_set_chip_and_handler(i, &at91_aic_chip, handle_level_irq);
	set_irq_flags(i, IRQF_VALID \| IRQF_PROBE);
	}

	at91_aic_hw_init(NR_AIC_IRQS);
	}