GIC: Add API to get interrupt active status

API documentation updated.

Change-Id: I6d61785af0d5330930c709de971a904dc7c3516c
Co-authored-by: Yousuf A <yousuf.sait@arm.com>
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>

6 files changed, 65 insertions, 3 deletions

diff --git a/drivers/arm/gic/common/gic_common.c b/drivers/arm/gic/common/gic_common.c
index 6535813f..71155a97 100644
--- a/drivers/arm/gic/common/gic_common.c
+++ b/drivers/arm/gic/common/gic_common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -273,6 +273,14 @@ void gicd_set_icpendr(uintptr_t base, unsigned int id)
 	gicd_write_icpendr(base, id, (1 << bit_num));
 }
 
+unsigned int gicd_get_isactiver(uintptr_t base, unsigned int id)
+{
+	unsigned int bit_num = id & ((1 << ISACTIVER_SHIFT) - 1);
+	unsigned int reg_val = gicd_read_isactiver(base, id);
+
+	return (reg_val >> bit_num) & 0x1;
+}
+
 void gicd_set_isactiver(uintptr_t base, unsigned int id)
 {
 	unsigned bit_num = id & ((1 << ISACTIVER_SHIFT) - 1);
diff --git a/drivers/arm/gic/common/gic_common_private.h b/drivers/arm/gic/common/gic_common_private.h
index 2077cc46..8b96b37b 100644
--- a/drivers/arm/gic/common/gic_common_private.h
+++ b/drivers/arm/gic/common/gic_common_private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -73,6 +73,7 @@ void gicd_set_isenabler(uintptr_t base, unsigned int id);
 void gicd_set_icenabler(uintptr_t base, unsigned int id);
 void gicd_set_ispendr(uintptr_t base, unsigned int id);
 void gicd_set_icpendr(uintptr_t base, unsigned int id);
+unsigned int gicd_get_isactiver(uintptr_t base, unsigned int id);
 void gicd_set_isactiver(uintptr_t base, unsigned int id);
 void gicd_set_icactiver(uintptr_t base, unsigned int id);
 void gicd_set_ipriorityr(uintptr_t base, unsigned int id, unsigned int pri);
diff --git a/drivers/arm/gic/v2/gicv2_main.c b/drivers/arm/gic/v2/gicv2_main.c
index 28266807..e33353a8 100644
--- a/drivers/arm/gic/v2/gicv2_main.c
+++ b/drivers/arm/gic/v2/gicv2_main.c
@@ -275,3 +275,16 @@ void gicv2_set_pe_target_mask(unsigned int proc_num)
 	driver_data->target_masks[proc_num] =
 		gicv2_get_cpuif_id(driver_data->gicd_base);
 }
+
+/*******************************************************************************
+ * This function returns the active status of the interrupt (either because the
+ * state is active, or active and pending).
+ ******************************************************************************/
+unsigned int gicv2_get_interrupt_active(unsigned int id)
+{
+	assert(driver_data);
+	assert(driver_data->gicd_base);
+	assert(id <= MAX_SPI_ID);
+
+	return gicd_get_isactiver(driver_data->gicd_base, id);
+}
diff --git a/drivers/arm/gic/v3/gicv3_helpers.c b/drivers/arm/gic/v3/gicv3_helpers.c
index 73ad060f..81d50ad4 100644
--- a/drivers/arm/gic/v3/gicv3_helpers.c
+++ b/drivers/arm/gic/v3/gicv3_helpers.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -172,6 +172,18 @@ void gicr_set_isenabler0(uintptr_t base, unsigned int id)
 }
 
 /*
+ * Accessor to set the bit corresponding to interrupt ID in GIC Re-distributor
+ * ISACTIVER0.
+ */
+unsigned int gicr_get_isactiver0(uintptr_t base, unsigned int id)
+{
+	unsigned bit_num = id & ((1 << ISACTIVER_SHIFT) - 1);
+	unsigned int reg_val = gicr_read_isactiver0(base);
+
+	return (reg_val >> bit_num) & 0x1;
+}
+
+/*
  * 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 7e757430..08cf0957 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -778,3 +778,30 @@ unsigned int gicv3_get_running_priority(void)
 {
 	return read_icc_rpr_el1();
 }
+
+/*******************************************************************************
+ * This function checks if the interrupt identified by id is active (whether the
+ * state is either active, or active and pending). The proc_num is used if the
+ * interrupt is SGI or PPI and programs the corresponding Redistributor
+ * interface.
+ ******************************************************************************/
+unsigned int gicv3_get_interrupt_active(unsigned int id, unsigned int proc_num)
+{
+	unsigned int value;
+
+	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);
+	assert(id <= MAX_SPI_ID);
+
+	if (id < MIN_SPI_ID) {
+		/* For SGIs and PPIs */
+		value = gicr_get_isactiver0(
+				gicv3_driver_data->rdistif_base_addrs[proc_num], id);
+	} else {
+		value = gicd_get_isactiver(gicv3_driver_data->gicd_base, id);
+	}
+
+	return value;
+}
diff --git a/drivers/arm/gic/v3/gicv3_private.h b/drivers/arm/gic/v3/gicv3_private.h
index 59298edf..bb8ad9ae 100644
--- a/drivers/arm/gic/v3/gicv3_private.h
+++ b/drivers/arm/gic/v3/gicv3_private.h
@@ -67,6 +67,7 @@ void gicr_write_ipriorityr(uintptr_t base, unsigned int id, unsigned int val);
 unsigned int gicd_get_igrpmodr(uintptr_t base, unsigned int id);
 unsigned int gicr_get_igrpmodr0(uintptr_t base, unsigned int id);
 unsigned int gicr_get_igroupr0(uintptr_t base, unsigned int id);
+unsigned int gicr_get_isactiver0(uintptr_t base, unsigned int id);
 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);