[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: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index a2cd9be..38518d4 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -4,6 +4,13 @@
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
diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index b2a781d..887c6eb 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -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 @@
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 @@
* @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 @@
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 @@
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
}
+
+ vic_pm_register(base, irq_start, resume_sources);
}
diff --git a/arch/arm/include/asm/hardware/vic.h b/arch/arm/include/asm/hardware/vic.h
index f87328d..5d72550 100644
--- a/arch/arm/include/asm/hardware/vic.h
+++ b/arch/arm/include/asm/hardware/vic.h
@@ -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
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index ae24486..6faa3dc 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -362,8 +362,8 @@
{
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) {
diff --git a/arch/arm/mach-netx/generic.c b/arch/arm/mach-netx/generic.c
index 79df60c..43da8bb 100644
--- a/arch/arm/mach-netx/generic.c
+++ b/arch/arm/mach-netx/generic.c
@@ -168,7 +168,7 @@
{
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);
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 1f929c3..c39c788 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -116,7 +116,7 @@
{
unsigned int i;
- vic_init(VA_VIC_BASE, IRQ_VIC_START, ~0);
+ vic_init(VA_VIC_BASE, IRQ_VIC_START, ~0, 0);
set_irq_chained_handler(IRQ_VICSOURCE31, sic_handle_irq);
diff --git a/arch/arm/plat-s3c64xx/irq.c b/arch/arm/plat-s3c64xx/irq.c
index f4c4844..8dc5b6d 100644
--- a/arch/arm/plat-s3c64xx/irq.c
+++ b/arch/arm/plat-s3c64xx/irq.c
@@ -232,8 +232,8 @@
printk(KERN_DEBUG "%s: initialising interrupts\n", __func__);
/* initialise the pair of VICs */
- vic_init(S3C_VA_VIC0, S3C_VIC0_BASE, vic0_valid);
- vic_init(S3C_VA_VIC1, S3C_VIC1_BASE, vic1_valid);
+ vic_init(S3C_VA_VIC0, S3C_VIC0_BASE, vic0_valid, 0);
+ vic_init(S3C_VA_VIC1, S3C_VIC1_BASE, vic1_valid, 0);
/* add the timer sub-irqs */
