GIC: Add API to set/clear interrupt pending

API documentation updated.

Change-Id: I14e33cfc7dfa93257c82d76fae186b17a1b6d266
Co-authored-by: Yousuf A <yousuf.sait@arm.com>
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

4 files changed, 119 insertions, 0 deletions

diff --git a/drivers/arm/gic/v2/gicv2_main.c b/drivers/arm/gic/v2/gicv2_main.c
index f0b902cf..eab4c3bf 100644
--- a/drivers/arm/gic/v2/gicv2_main.c
+++ b/drivers/arm/gic/v2/gicv2_main.c
@@ -438,3 +438,41 @@ void gicv2_set_spi_routing(unsigned int id, int proc_num)
 
 	gicd_set_itargetsr(driver_data->gicd_base, id, target);
 }
+
+/*******************************************************************************
+ * This function clears the pending status of an interrupt identified by id.
+ ******************************************************************************/
+void gicv2_clear_interrupt_pending(unsigned int id)
+{
+	assert(driver_data);
+	assert(driver_data->gicd_base);
+
+	/* SGIs can't be cleared pending */
+	assert(id >= MIN_PPI_ID);
+
+	/*
+	 * Clear pending interrupt, and ensure that any shared variable updates
+	 * depending on out of band interrupt trigger are observed afterwards.
+	 */
+	gicd_set_icpendr(driver_data->gicd_base, id);
+	dsbishst();
+}
+
+/*******************************************************************************
+ * This function sets the pending status of an interrupt identified by id.
+ ******************************************************************************/
+void gicv2_set_interrupt_pending(unsigned int id)
+{
+	assert(driver_data);
+	assert(driver_data->gicd_base);
+
+	/* SGIs can't be cleared pending */
+	assert(id >= MIN_PPI_ID);
+
+	/*
+	 * Ensure that any shared variable updates depending on out of band
+	 * interrupt trigger are observed before setting interrupt pending.
+	 */
+	dsbishst();
+	gicd_set_ispendr(driver_data->gicd_base, id);
+}
diff --git a/drivers/arm/gic/v3/gicv3_helpers.c b/drivers/arm/gic/v3/gicv3_helpers.c
index ee874f92..3abc6a5c 100644
--- a/drivers/arm/gic/v3/gicv3_helpers.c
+++ b/drivers/arm/gic/v3/gicv3_helpers.c
@@ -195,6 +195,28 @@ unsigned int gicr_get_isactiver0(uintptr_t base, unsigned int id)
 }
 
 /*
+ * Accessor to clear the bit corresponding to interrupt ID in GIC Re-distributor
+ * ICPENDRR0.
+ */
+void gicr_set_icpendr0(uintptr_t base, unsigned int id)
+{
+	unsigned bit_num = id & ((1 << ICPENDR_SHIFT) - 1);
+
+	gicr_write_icpendr0(base, (1 << bit_num));
+}
+
+/*
+ * Accessor to set the bit corresponding to interrupt ID in GIC Re-distributor
+ * ISPENDR0.
+ */
+void gicr_set_ispendr0(uintptr_t base, unsigned int id)
+{
+	unsigned bit_num = id & ((1 << ISPENDR_SHIFT) - 1);
+
+	gicr_write_ispendr0(base, (1 << bit_num));
+}
+
+/*
  * Accessor to set the byte corresponding to interrupt ID
  * in GIC Re-distributor IPRIORITYR.
  */
diff --git a/drivers/arm/gic/v3/gicv3_main.c b/drivers/arm/gic/v3/gicv3_main.c
index c81ba950..43dd77f1 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -1037,3 +1037,55 @@ void gicv3_set_spi_routing(unsigned int id, unsigned int irm, u_register_t mpidr
 		}
 	}
 }
+
+/*******************************************************************************
+ * This function clears the pending status of an interrupt identified by id.
+ * The proc_num is used if the interrupt is SGI or PPI, and programs the
+ * corresponding Redistributor interface.
+ ******************************************************************************/
+void gicv3_clear_interrupt_pending(unsigned int id, unsigned int proc_num)
+{
+	assert(gicv3_driver_data);
+	assert(gicv3_driver_data->gicd_base);
+	assert(proc_num < gicv3_driver_data->rdistif_num);
+	assert(gicv3_driver_data->rdistif_base_addrs);
+
+	/*
+	 * Clear pending interrupt, and ensure that any shared variable updates
+	 * depending on out of band interrupt trigger are observed afterwards.
+	 */
+	if (id < MIN_SPI_ID) {
+		/* For SGIs and PPIs */
+		gicr_set_icpendr0(gicv3_driver_data->rdistif_base_addrs[proc_num],
+				id);
+	} else {
+		gicd_set_icpendr(gicv3_driver_data->gicd_base, id);
+	}
+	dsbishst();
+}
+
+/*******************************************************************************
+ * This function sets the pending status of an interrupt identified by id.
+ * The proc_num is used if the interrupt is SGI or PPI and programs the
+ * corresponding Redistributor interface.
+ ******************************************************************************/
+void gicv3_set_interrupt_pending(unsigned int id, unsigned int proc_num)
+{
+	assert(gicv3_driver_data);
+	assert(gicv3_driver_data->gicd_base);
+	assert(proc_num < gicv3_driver_data->rdistif_num);
+	assert(gicv3_driver_data->rdistif_base_addrs);
+
+	/*
+	 * Ensure that any shared variable updates depending on out of band
+	 * interrupt trigger are observed before setting interrupt pending.
+	 */
+	dsbishst();
+	if (id < MIN_SPI_ID) {
+		/* For SGIs and PPIs */
+		gicr_set_ispendr0(gicv3_driver_data->rdistif_base_addrs[proc_num],
+				id);
+	} else {
+		gicd_set_ispendr(gicv3_driver_data->gicd_base, id);
+	}
+}
diff --git a/drivers/arm/gic/v3/gicv3_private.h b/drivers/arm/gic/v3/gicv3_private.h
index 19fce2e7..43529c5a 100644
--- a/drivers/arm/gic/v3/gicv3_private.h
+++ b/drivers/arm/gic/v3/gicv3_private.h
@@ -72,6 +72,8 @@ void gicd_set_igrpmodr(uintptr_t base, unsigned int id);
 void gicr_set_igrpmodr0(uintptr_t base, unsigned int id);
 void gicr_set_isenabler0(uintptr_t base, unsigned int id);
 void gicr_set_icenabler0(uintptr_t base, unsigned int id);
+void gicr_set_ispendr0(uintptr_t base, unsigned int id);
+void gicr_set_icpendr0(uintptr_t base, unsigned int id);
 void gicr_set_igroupr0(uintptr_t base, unsigned int id);
 void gicd_clr_igrpmodr(uintptr_t base, unsigned int id);
 void gicr_clr_igrpmodr0(uintptr_t base, unsigned int id);
@@ -221,6 +223,11 @@ static inline unsigned int gicr_read_isenabler0(uintptr_t base)
 	return mmio_read_32(base + GICR_ISENABLER0);
 }
 
+static inline void gicr_write_icpendr0(uintptr_t base, unsigned int val)
+{
+	mmio_write_32(base + GICR_ICPENDR0, val);
+}
+
 static inline void gicr_write_isenabler0(uintptr_t base, unsigned int val)
 {
 	mmio_write_32(base + GICR_ISENABLER0, val);