irqchip: GICv3: Add support for irq_[get, set]_irqchip_state()

Add the required hooks for the internal state of an interrupt
to be exposed to other subsystems.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Phong Vo <pvo@apm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Tin Huynh <tnhuynh@apm.com>
Cc: Y Vo <yvo@apm.com>
Cc: Toan Le <toanle@apm.com>
Cc: Bjorn Andersson <bjorn@kryo.se>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/1426676484-21812-4-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 70 insertions, 13 deletions

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index fd8850def1b8..4f2fb62e6f37 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -195,6 +195,19 @@ static void gic_enable_redist(bool enable)
 /*
  * Routines to disable, enable, EOI and route interrupts
  */
+static int gic_peek_irq(struct irq_data *d, u32 offset)
+{
+        u32 mask = 1 << (gic_irq(d) % 32);
+        void __iomem *base;
+
+        if (gic_irq_in_rdist(d))
+                base = gic_data_rdist_sgi_base();
+        else
+                base = gic_data.dist_base;
+
+        return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
+}
+
 static void gic_poke_irq(struct irq_data *d, u32 offset)
 {
         u32 mask = 1 << (gic_irq(d) % 32);
@@ -223,6 +236,61 @@ static void gic_unmask_irq(struct irq_data *d)
         gic_poke_irq(d, GICD_ISENABLER);
 }
 
+static int gic_irq_set_irqchip_state(struct irq_data *d,
+                                     enum irqchip_irq_state which, bool val)
+{
+        u32 reg;
+
+        if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
+                return -EINVAL;
+
+        switch (which) {
+        case IRQCHIP_STATE_PENDING:
+                reg = val ? GICD_ISPENDR : GICD_ICPENDR;
+                break;
+
+        case IRQCHIP_STATE_ACTIVE:
+                reg = val ? GICD_ISACTIVER : GICD_ICACTIVER;
+                break;
+
+        case IRQCHIP_STATE_MASKED:
+                reg = val ? GICD_ICENABLER : GICD_ISENABLER;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        gic_poke_irq(d, reg);
+        return 0;
+}
+
+static int gic_irq_get_irqchip_state(struct irq_data *d,
+                                     enum irqchip_irq_state which, bool *val)
+{
+        if (d->hwirq >= gic_data.irq_nr) /* PPI/SPI only */
+                return -EINVAL;
+
+        switch (which) {
+        case IRQCHIP_STATE_PENDING:
+                *val = gic_peek_irq(d, GICD_ISPENDR);
+                break;
+
+        case IRQCHIP_STATE_ACTIVE:
+                *val = gic_peek_irq(d, GICD_ISACTIVER);
+                break;
+
+        case IRQCHIP_STATE_MASKED:
+                *val = !gic_peek_irq(d, GICD_ISENABLER);
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
 static void gic_eoi_irq(struct irq_data *d)
 {
         gic_write_eoir(gic_irq(d));
@@ -418,19 +486,6 @@ static void gic_cpu_init(void)
 }
 
 #ifdef CONFIG_SMP
-static int gic_peek_irq(struct irq_data *d, u32 offset)
-{
-        u32 mask = 1 << (gic_irq(d) % 32);
-        void __iomem *base;
-
-        if (gic_irq_in_rdist(d))
-                base = gic_data_rdist_sgi_base();
-        else
-                base = gic_data.dist_base;
-
-        return !!(readl_relaxed(base + offset + (gic_irq(d) / 32) * 4) & mask);
-}
-
 static int gic_secondary_init(struct notifier_block *nfb,
                               unsigned long action, void *hcpu)
 {
@@ -601,6 +656,8 @@ static struct irq_chip gic_chip = {
         .irq_eoi                = gic_eoi_irq,
         .irq_set_type           = gic_set_type,
         .irq_set_affinity       = gic_set_affinity,
+        .irq_get_irqchip_state  = gic_irq_get_irqchip_state,
+        .irq_set_irqchip_state  = gic_irq_set_irqchip_state,
 };
 
 #define GIC_ID_NR               (1U << gic_data.rdists.id_bits)