From d16b045c5648ace7573ced3c58b61ab1e54244fd Mon Sep 17 00:00:00 2001
From: Varun Wadekar <vwadekar@nvidia.com>
Date: Fri, 26 Jan 2018 10:33:42 -0800
Subject: [PATCH] Tegra: fiq_glue: support to handle LEGACY_FIQ PPIs for Tegra
SoCs
This patch adds support to handle secure PPIs for Tegra watchdog timers. This
functionality is currently protected by the ENABLE_WDT_LEGACY_FIQ_HANDLING
configuration variable and is only enabled for Tegra210 platforms, for now.
Change-Id: I0752ef54a986c58305e1bc8ad9be71d4a8bbd394
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
---
plat/nvidia/tegra/common/tegra_fiq_glue.c | 20 ++++++++++++++++++++
plat/nvidia/tegra/soc/t210/platform_t210.mk | 3 +++
2 files changed, 23 insertions(+)
diff --git a/plat/nvidia/tegra/common/tegra_fiq_glue.c b/plat/nvidia/tegra/common/tegra_fiq_glue.c
index b03669045..60b559556 100644
--- a/plat/nvidia/tegra/common/tegra_fiq_glue.c
+++ b/plat/nvidia/tegra/common/tegra_fiq_glue.c
@@ -16,9 +16,15 @@
#include <lib/el3_runtime/context_mgmt.h>
#include <plat/common/platform.h>
+#if ENABLE_WDT_LEGACY_FIQ_HANDLING
+#include <flowctrl.h>
+#endif
#include <tegra_def.h>
#include <tegra_private.h>
+/* Legacy FIQ used by earlier Tegra platforms */
+#define LEGACY_FIQ_PPI_WDT 28U
+
static DEFINE_BAKERY_LOCK(tegra_fiq_lock);
/*******************************************************************************
@@ -79,6 +85,20 @@ static uint64_t tegra_fiq_interrupt_handler(uint32_t id,
cm_set_elr_el3(NON_SECURE, ns_fiq_handler_addr);
}
+#if ENABLE_WDT_LEGACY_FIQ_HANDLING
+ /*
+ * Tegra platforms that use LEGACY_FIQ as the watchdog timer FIQ
+ * need to issue an IPI to other CPUs, to allow them to handle
+ * the "system hung" scenario. This interrupt is passed to the GICD
+ * via the Flow Controller. So, once we receive this interrupt,
+ * disable the routing so that we can mark it as "complete" in the
+ * GIC later.
+ */
+ if (irq == LEGACY_FIQ_PPI_WDT) {
+ tegra_fc_disable_fiq_to_ccplex_routing();
+ }
+#endif
+
/*
* Mark this interrupt as complete to avoid a FIQ storm.
*/
diff --git a/plat/nvidia/tegra/soc/t210/platform_t210.mk b/plat/nvidia/tegra/soc/t210/platform_t210.mk
index e23d7e360..59077eb81 100644
--- a/plat/nvidia/tegra/soc/t210/platform_t210.mk
+++ b/plat/nvidia/tegra/soc/t210/platform_t210.mk
@@ -22,6 +22,9 @@ $(eval $(call add_define,MAX_XLAT_TABLES))
MAX_MMAP_REGIONS := 15
$(eval $(call add_define,MAX_MMAP_REGIONS))
+ENABLE_WDT_LEGACY_FIQ_HANDLING := 1
+$(eval $(call add_define,ENABLE_WDT_LEGACY_FIQ_HANDLING))
+
PLAT_INCLUDES += -I${SOC_DIR}/drivers/se
BL31_SOURCES += drivers/ti/uart/aarch64/16550_console.S \
--
GitLab