Commit c07f87f2 authored by Ben Dooks's avatar Ben Dooks
Browse files

[ARM] VIC: Add power management device 



Add power management support to the VIC by registering
each VIC as a system device to get suspend/resume
events going.

Since the VIC registeration is done early, we need to
record the VICs in a static array which is used to add
the system devices later once the initcalls are run. This
means there is now a configuration value for the number
of VICs in the system.

Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent d87964c4

arch/arm/common/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -4,6 +4,13 @@ config ARM_GIC 
config ARM_VIC

	bool



config ARM_VIC_NR

	int

	default 2

	help

	  The maximum number of VICs available in the system, for

	  power management.



config ICST525

	bool

arch/arm/common/vic.c

+214 −7
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#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>
@@ -39,11 +40,219 @@ static void vic_unmask_irq(unsigned int irq) 
	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,

};



/**
@@ -51,9 +260,10 @@ static struct irq_chip vic_chip = { 
 * @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 vic_sources, u32 resume_sources)

{

	unsigned int i;
@@ -77,12 +287,7 @@ void __init vic_init(void __iomem *base, unsigned int irq_start, 
		writel(value, base + VIC_PL190_VECT_ADDR);

	}



	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);

	vic_init2(base);



	for (i = 0; i < 32; i++) {

		if (vic_sources & (1 << i)) {
@@ -94,4 +299,6 @@ void __init vic_init(void __iomem *base, unsigned int irq_start, 
			set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);

		}

	}



	vic_pm_register(base, irq_start, resume_sources);

}

arch/arm/include/asm/hardware/vic.h

+1 −1
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ 
#define VIC_PL192_VECT_ADDR		0xF00



#ifndef __ASSEMBLY__

void vic_init(void __iomem *base, unsigned int irq_start, u32 vic_sources);

void vic_init(void __iomem *base, unsigned int irq_start, u32 vic_sources, u32 resume_sources);

#endif



#endif

arch/arm/mach-ep93xx/core.c

+2 −2
Original line number Diff line number Diff line
@@ -362,8 +362,8 @@ void __init ep93xx_init_irq(void) 
{

	int gpio_irq;



	vic_init((void *)EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK);

	vic_init((void *)EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK);

	vic_init((void *)EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);

	vic_init((void *)EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);



	for (gpio_irq = gpio_to_irq(0);

	     gpio_irq <= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ); ++gpio_irq) {

arch/arm/mach-netx/generic.c

+1 −1
Original line number Diff line number Diff line
@@ -168,7 +168,7 @@ void __init netx_init_irq(void) 
{

	int irq;



	vic_init(__io(io_p2v(NETX_PA_VIC)), 0, ~0);

	vic_init(__io(io_p2v(NETX_PA_VIC)), 0, ~0, 0);



	for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {

		set_irq_chip(irq, &netx_hif_chip);

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