GIC: Add API to set priority mask
API documentation updated.
Change-Id: I40feec1fe67a960d035061b54dd55610bc34ce1d
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/drivers/arm/gic/v2/gicv2_main.c b/drivers/arm/gic/v2/gicv2_main.c
index eab4c3b..59b6632 100644
--- a/drivers/arm/gic/v2/gicv2_main.c
+++ b/drivers/arm/gic/v2/gicv2_main.c
@@ -476,3 +476,27 @@
dsbishst();
gicd_set_ispendr(driver_data->gicd_base, id);
}
+
+/*******************************************************************************
+ * This function sets the PMR register with the supplied value. Returns the
+ * original PMR.
+ ******************************************************************************/
+unsigned int gicv2_set_pmr(unsigned int mask)
+{
+ unsigned int old_mask;
+
+ assert(driver_data);
+ assert(driver_data->gicc_base);
+
+ old_mask = gicc_read_pmr(driver_data->gicc_base);
+
+ /*
+ * Order memory updates w.r.t. PMR write, and ensure they're visible
+ * before potential out of band interrupt trigger because of PMR update.
+ */
+ dmbishst();
+ gicc_write_pmr(driver_data->gicc_base, mask);
+ dsbishst();
+
+ return old_mask;
+}
diff --git a/drivers/arm/gic/v3/gicv3_main.c b/drivers/arm/gic/v3/gicv3_main.c
index 43dd77f..0f50f6d 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -1089,3 +1089,25 @@
gicd_set_ispendr(gicv3_driver_data->gicd_base, id);
}
}
+
+/*******************************************************************************
+ * This function sets the PMR register with the supplied value. Returns the
+ * original PMR.
+ ******************************************************************************/
+unsigned int gicv3_set_pmr(unsigned int mask)
+{
+ unsigned int old_mask;
+
+ old_mask = read_icc_pmr_el1();
+
+ /*
+ * Order memory updates w.r.t. PMR write, and ensure they're visible
+ * before potential out of band interrupt trigger because of PMR update.
+ * PMR system register writes are self-synchronizing, so no ISB required
+ * thereafter.
+ */
+ dsbishst();
+ write_icc_pmr_el1(mask);
+
+ return old_mask;
+}