arch/arm/common/vic.c - linux - Git at Google

 /*
  *  linux/arch/arm/common/vic.c
  *
  *  Copyright (C) 1999 - 2003 ARM Limited
  *  Copyright (C) 2000 Deep Blue Solutions Ltd
  *
  * 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/list.h>
 #include <linux/io.h>
 #include <linux/sysdev.h>

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

 static void vic_mask_irq(unsigned int irq)
 {
 	void __iomem *base = get_irq_chip_data(irq);
 	irq &= 31;
 	writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
 }

 static void vic_unmask_irq(unsigned int irq)
 {
 	void __iomem *base = get_irq_chip_data(irq);
 	irq &= 31;
 	writel(1 << irq, base + VIC_INT_ENABLE);
 }

 /**
  * vic_init2 - common initialisation code
  * @base: Base of the VIC.
  *
  * Common initialisation code for registeration
  * and resume.
 */
 static void vic_init2(void __iomem *base)
 {
 	int i;

 	for (i = 0; i < 16; i++) {
 		void __iomem *reg = base + VIC_VECT_CNTL0 + (i * 4);
 		writel(VIC_VECT_CNTL_ENABLE | i, reg);
 	}

 	writel(32, base + VIC_PL190_DEF_VECT_ADDR);
 }

 #if defined(CONFIG_PM)
 /**
  * struct vic_device - VIC PM device
  * @sysdev: The system device which is registered.
  * @irq: The IRQ number for the base of the VIC.
  * @base: The register base for the VIC.
  * @resume_sources: A bitmask of interrupts for resume.
  * @resume_irqs: The IRQs enabled for resume.
  * @int_select: Save for VIC_INT_SELECT.
  * @int_enable: Save for VIC_INT_ENABLE.
  * @soft_int: Save for VIC_INT_SOFT.
  * @protect: Save for VIC_PROTECT.
  */
 struct vic_device {
 	struct sys_device sysdev;

 	void __iomem	*base;
 	int		irq;
 	u32		resume_sources;
 	u32		resume_irqs;
 	u32		int_select;
 	u32		int_enable;
 	u32		soft_int;
 	u32		protect;
 };

 /* we cannot allocate memory when VICs are initially registered */
 static struct vic_device vic_devices[CONFIG_ARM_VIC_NR];

 static inline struct vic_device *to_vic(struct sys_device *sys)
 {
 	return container_of(sys, struct vic_device, sysdev);
 }

 static int vic_id;

 static int vic_class_resume(struct sys_device *dev)
 {
 	struct vic_device *vic = to_vic(dev);
 	void __iomem *base = vic->base;

 	printk(KERN_DEBUG "%s: resuming vic at %p\n", __func__, base);

 	/* re-initialise static settings */
 	vic_init2(base);

 	writel(vic->int_select, base + VIC_INT_SELECT);
 	writel(vic->protect, base + VIC_PROTECT);

 	/* set the enabled ints and then clear the non-enabled */
 	writel(vic->int_enable, base + VIC_INT_ENABLE);
 	writel(~vic->int_enable, base + VIC_INT_ENABLE_CLEAR);

 	/* and the same for the soft-int register */

 	writel(vic->soft_int, base + VIC_INT_SOFT);
 	writel(~vic->soft_int, base + VIC_INT_SOFT_CLEAR);

 	return 0;
 }

 static int vic_class_suspend(struct sys_device *dev, pm_message_t state)
 {
 	struct vic_device *vic = to_vic(dev);
 	void __iomem *base = vic->base;

 	printk(KERN_DEBUG "%s: suspending vic at %p\n", __func__, base);

 	vic->int_select = readl(base + VIC_INT_SELECT);
 	vic->int_enable = readl(base + VIC_INT_ENABLE);
 	vic->soft_int = readl(base + VIC_INT_SOFT);
 	vic->protect = readl(base + VIC_PROTECT);

 	/* set the interrupts (if any) that are used for
 	 * resuming the system */

 	writel(vic->resume_irqs, base + VIC_INT_ENABLE);
 	writel(~vic->resume_irqs, base + VIC_INT_ENABLE_CLEAR);

 	return 0;
 }

 struct sysdev_class vic_class = {
 	.name		= "vic",
 	.suspend	= vic_class_suspend,
 	.resume		= vic_class_resume,
 };

 /**
  * vic_pm_register - Register a VIC for later power management control
  * @base: The base address of the VIC.
  * @irq: The base IRQ for the VIC.
  * @resume_sources: bitmask of interrupts allowed for resume sources.
  *
  * Register the VIC with the system device tree so that it can be notified
  * of suspend and resume requests and ensure that the correct actions are
  * taken to re-instate the settings on resume.
  */
 static void __init vic_pm_register(void __iomem *base, unsigned int irq, u32 resume_sources)
 {
 	struct vic_device *v;

 	if (vic_id >= ARRAY_SIZE(vic_devices))
 		printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__);
 	else {
 		v = &vic_devices[vic_id];
 		v->base = base;
 		v->resume_sources = resume_sources;
 		v->irq = irq;
 		vic_id++;
 	}
 }

 /**
  * vic_pm_init - initicall to register VIC pm
  *
  * This is called via late_initcall() to register
  * the resources for the VICs due to the early
  * nature of the VIC's registration.
 */
 static int __init vic_pm_init(void)
 {
 	struct vic_device *dev = vic_devices;
 	int err;
 	int id;

 	if (vic_id == 0)
 		return 0;

 	err = sysdev_class_register(&vic_class);
 	if (err) {
 		printk(KERN_ERR "%s: cannot register class\n", __func__);
 		return err;
 	}

 	for (id = 0; id < vic_id; id++, dev++) {
 		dev->sysdev.id = id;
 		dev->sysdev.cls = &vic_class;

 		err = sysdev_register(&dev->sysdev);
 		if (err) {
 			printk(KERN_ERR "%s: failed to register device\n",
 			       __func__);
 			return err;
 		}
 	}

 	return 0;
 }

 late_initcall(vic_pm_init);

 static struct vic_device *vic_from_irq(unsigned int irq)
 {
         struct vic_device *v = vic_devices;
 	unsigned int base_irq = irq & ~31;
 	int id;

 	for (id = 0; id < vic_id; id++, v++) {
 		if (v->irq == base_irq)
 			return v;
 	}

 	return NULL;
 }

 static int vic_set_wake(unsigned int irq, unsigned int on)
 {
 	struct vic_device *v = vic_from_irq(irq);
 	unsigned int off = irq & 31;

 	if (!v)
 		return -EINVAL;

 	if (on)
 		v->resume_irqs |= 1 << off;
 	else
 		v->resume_irqs &= ~(1 << off);

 	return 0;
 }

 #else
 static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg1) { }

 #define vic_set_wake NULL
 #endif /* CONFIG_PM */

 static struct irq_chip vic_chip = {
 	.name	= "VIC",
 	.ack	= vic_mask_irq,
 	.mask	= vic_mask_irq,
 	.unmask	= vic_unmask_irq,
 	.set_wake = vic_set_wake,
 };

 /**
  * vic_init - initialise a vectored interrupt controller
  * @base: iomem base address
  * @irq_start: starting interrupt number, must be muliple of 32
  * @vic_sources: bitmask of interrupt sources to allow
  * @resume_sources: bitmask of interrupt sources to allow for resume
  */
 void __init vic_init(void __iomem *base, unsigned int irq_start,
 		     u32 vic_sources, u32 resume_sources)
 {
 	unsigned int i;

 	/* Disable all interrupts initially. */

 	writel(0, base + VIC_INT_SELECT);
 	writel(0, base + VIC_INT_ENABLE);
 	writel(~0, base + VIC_INT_ENABLE_CLEAR);
 	writel(0, base + VIC_IRQ_STATUS);
 	writel(0, base + VIC_ITCR);
 	writel(~0, base + VIC_INT_SOFT_CLEAR);

 	/*
 	 * Make sure we clear all existing interrupts
 	 */
 	writel(0, base + VIC_PL190_VECT_ADDR);
 	for (i = 0; i < 19; i++) {
 		unsigned int value;

 		value = readl(base + VIC_PL190_VECT_ADDR);
 		writel(value, base + VIC_PL190_VECT_ADDR);
 	}

 	vic_init2(base);

 	for (i = 0; i < 32; i++) {
 		if (vic_sources & (1 << i)) {
 			unsigned int irq = irq_start + i;

 			set_irq_chip(irq, &vic_chip);
 			set_irq_chip_data(irq, base);
 			set_irq_handler(irq, handle_level_irq);
 			set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 		}
 	}

 	vic_pm_register(base, irq_start, resume_sources);
 }
	/*
	* linux/arch/arm/common/vic.c
	*
	* Copyright (C) 1999 - 2003 ARM Limited
	* Copyright (C) 2000 Deep Blue Solutions Ltd
	*
	* 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/list.h>
	#include <linux/io.h>
	#include <linux/sysdev.h>

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

	static void vic_mask_irq(unsigned int irq)
	{
	void __iomem *base = get_irq_chip_data(irq);
	irq &= 31;
	writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
	}

	static void vic_unmask_irq(unsigned int irq)
	{
	void __iomem *base = get_irq_chip_data(irq);
	irq &= 31;
	writel(1 << irq, base + VIC_INT_ENABLE);
	}

	/**
	* vic_init2 - common initialisation code
	* @base: Base of the VIC.
	*
	* Common initialisation code for registeration
	* and resume.
	*/
	static void vic_init2(void __iomem *base)
	{
	int i;

	for (i = 0; i < 16; i++) {
	void __iomem reg = base + VIC_VECT_CNTL0 + (i 4);
	writel(VIC_VECT_CNTL_ENABLE \| i, reg);
	}

	writel(32, base + VIC_PL190_DEF_VECT_ADDR);
	}

	#if defined(CONFIG_PM)
	/**
	* struct vic_device - VIC PM device
	* @sysdev: The system device which is registered.
	* @irq: The IRQ number for the base of the VIC.
	* @base: The register base for the VIC.
	* @resume_sources: A bitmask of interrupts for resume.
	* @resume_irqs: The IRQs enabled for resume.
	* @int_select: Save for VIC_INT_SELECT.
	* @int_enable: Save for VIC_INT_ENABLE.
	* @soft_int: Save for VIC_INT_SOFT.
	* @protect: Save for VIC_PROTECT.
	*/
	struct vic_device {
	struct sys_device sysdev;

	void __iomem *base;
	int irq;
	u32 resume_sources;
	u32 resume_irqs;
	u32 int_select;
	u32 int_enable;
	u32 soft_int;
	u32 protect;
	};

	/* we cannot allocate memory when VICs are initially registered */
	static struct vic_device vic_devices[CONFIG_ARM_VIC_NR];

	static inline struct vic_device to_vic(struct sys_device sys)
	{
	return container_of(sys, struct vic_device, sysdev);
	}

	static int vic_id;

	static int vic_class_resume(struct sys_device *dev)
	{
	struct vic_device *vic = to_vic(dev);
	void __iomem *base = vic->base;

	printk(KERN_DEBUG "%s: resuming vic at %p\n", __func__, base);

	/* re-initialise static settings */
	vic_init2(base);

	writel(vic->int_select, base + VIC_INT_SELECT);
	writel(vic->protect, base + VIC_PROTECT);

	/* set the enabled ints and then clear the non-enabled */
	writel(vic->int_enable, base + VIC_INT_ENABLE);
	writel(~vic->int_enable, base + VIC_INT_ENABLE_CLEAR);

	/* and the same for the soft-int register */

	writel(vic->soft_int, base + VIC_INT_SOFT);
	writel(~vic->soft_int, base + VIC_INT_SOFT_CLEAR);

	return 0;
	}

	static int vic_class_suspend(struct sys_device *dev, pm_message_t state)
	{
	struct vic_device *vic = to_vic(dev);
	void __iomem *base = vic->base;

	printk(KERN_DEBUG "%s: suspending vic at %p\n", __func__, base);

	vic->int_select = readl(base + VIC_INT_SELECT);
	vic->int_enable = readl(base + VIC_INT_ENABLE);
	vic->soft_int = readl(base + VIC_INT_SOFT);
	vic->protect = readl(base + VIC_PROTECT);

	/* set the interrupts (if any) that are used for
	* resuming the system */

	writel(vic->resume_irqs, base + VIC_INT_ENABLE);
	writel(~vic->resume_irqs, base + VIC_INT_ENABLE_CLEAR);

	return 0;
	}

	struct sysdev_class vic_class = {
	.name = "vic",
	.suspend = vic_class_suspend,
	.resume = vic_class_resume,
	};

	/**
	* vic_pm_register - Register a VIC for later power management control
	* @base: The base address of the VIC.
	* @irq: The base IRQ for the VIC.
	* @resume_sources: bitmask of interrupts allowed for resume sources.
	*
	* Register the VIC with the system device tree so that it can be notified
	* of suspend and resume requests and ensure that the correct actions are
	* taken to re-instate the settings on resume.
	*/
	static void __init vic_pm_register(void __iomem *base, unsigned int irq, u32 resume_sources)
	{
	struct vic_device *v;

	if (vic_id >= ARRAY_SIZE(vic_devices))
	printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__);
	else {
	v = &vic_devices[vic_id];
	v->base = base;
	v->resume_sources = resume_sources;
	v->irq = irq;
	vic_id++;
	}
	}

	/**
	* vic_pm_init - initicall to register VIC pm
	*
	* This is called via late_initcall() to register
	* the resources for the VICs due to the early
	* nature of the VIC's registration.
	*/
	static int __init vic_pm_init(void)
	{
	struct vic_device *dev = vic_devices;
	int err;
	int id;

	if (vic_id == 0)
	return 0;

	err = sysdev_class_register(&vic_class);
	if (err) {
	printk(KERN_ERR "%s: cannot register class\n", __func__);
	return err;
	}

	for (id = 0; id < vic_id; id++, dev++) {
	dev->sysdev.id = id;
	dev->sysdev.cls = &vic_class;

	err = sysdev_register(&dev->sysdev);
	if (err) {
	printk(KERN_ERR "%s: failed to register device\n",
	__func__);
	return err;
	}
	}

	return 0;
	}

	late_initcall(vic_pm_init);

	static struct vic_device *vic_from_irq(unsigned int irq)
	{
	struct vic_device *v = vic_devices;
	unsigned int base_irq = irq & ~31;
	int id;

	for (id = 0; id < vic_id; id++, v++) {
	if (v->irq == base_irq)
	return v;
	}

	return NULL;
	}

	static int vic_set_wake(unsigned int irq, unsigned int on)
	{
	struct vic_device *v = vic_from_irq(irq);
	unsigned int off = irq & 31;

	if (!v)
	return -EINVAL;

	if (on)
	v->resume_irqs \|= 1 << off;
	else
	v->resume_irqs &= ~(1 << off);

	return 0;
	}

	#else
	static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg1) { }

	#define vic_set_wake NULL
	#endif /* CONFIG_PM */

	static struct irq_chip vic_chip = {
	.name = "VIC",
	.ack = vic_mask_irq,
	.mask = vic_mask_irq,
	.unmask = vic_unmask_irq,
	.set_wake = vic_set_wake,
	};

	/**
	* vic_init - initialise a vectored interrupt controller
	* @base: iomem base address
	* @irq_start: starting interrupt number, must be muliple of 32
	* @vic_sources: bitmask of interrupt sources to allow
	* @resume_sources: bitmask of interrupt sources to allow for resume
	*/
	void __init vic_init(void __iomem *base, unsigned int irq_start,
	u32 vic_sources, u32 resume_sources)
	{
	unsigned int i;

	/* Disable all interrupts initially. */

	writel(0, base + VIC_INT_SELECT);
	writel(0, base + VIC_INT_ENABLE);
	writel(~0, base + VIC_INT_ENABLE_CLEAR);
	writel(0, base + VIC_IRQ_STATUS);
	writel(0, base + VIC_ITCR);
	writel(~0, base + VIC_INT_SOFT_CLEAR);

	/*
	* Make sure we clear all existing interrupts
	*/
	writel(0, base + VIC_PL190_VECT_ADDR);
	for (i = 0; i < 19; i++) {
	unsigned int value;

	value = readl(base + VIC_PL190_VECT_ADDR);
	writel(value, base + VIC_PL190_VECT_ADDR);
	}

	vic_init2(base);

	for (i = 0; i < 32; i++) {
	if (vic_sources & (1 << i)) {
	unsigned int irq = irq_start + i;

	set_irq_chip(irq, &vic_chip);
	set_irq_chip_data(irq, base);
	set_irq_handler(irq, handle_level_irq);
	set_irq_flags(irq, IRQF_VALID \| IRQF_PROBE);
	}
	}

	vic_pm_register(base, irq_start, resume_sources);
	}