Without reconfiguration of the AIC redirection, the OS interrupt
handling will misbehave later on. Add it to the SoC init.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
arch/arm/mach-at91/Makefile | 2 +-
arch/arm/mach-at91/aic.c | 28 +++++++++++++++++++++++++++
arch/arm/mach-at91/include/mach/aic.h | 9 +++++++++
arch/arm/mach-at91/sama5d2.c | 2 ++
4 files changed, 40 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/mach-at91/aic.c
create mode 100644 arch/arm/mach-at91/include/mach/aic.h
diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
index 7c8399ee76f2..254bbeef2773 100644
--- a/arch/arm/mach-at91/Makefile
+++ b/arch/arm/mach-at91/Makefile
@@ -1,4 +1,4 @@
-obj-y += setup.o
+obj-y += setup.o aic.o
lwl-y += at91_pmc_ll.o ddramc_ll.o matrix.o
lwl-$(CONFIG_CLOCKSOURCE_ATMEL_PIT) += early_udelay.o
diff --git a/arch/arm/mach-at91/aic.c b/arch/arm/mach-at91/aic.c
new file mode 100644
index 000000000000..b40f1d214b28
--- /dev/null
+++ b/arch/arm/mach-at91/aic.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: BSD-1-Clause
+/*
+ * Copyright (c) 2015, Atmel Corporation
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ */
+
+#include <mach/aic.h>
+#include <io.h>
+
+#define SFR_AICREDIR 0x54
+#define SFR_SN1 0x50 /* Serial Number 1 Register */
+
+void at91_aic_redir(void __iomem *sfr, u32 key)
+{
+ u32 key32;
+
+ if (readl(sfr + SFR_AICREDIR) & 0x01)
+ return;
+
+ key32 = readl(sfr + SFR_SN1) ^ key;
+ writel(key32 | 0x01, sfr + SFR_AICREDIR);
+ /* bits[31:1] = key */
+ /* bit[0] = 1 => all interrupts redirected to AIC */
+ /* bit[0] = 0 => secure interrupts directed to SAIC,
+ others to AIC (default) */
+}
diff --git a/arch/arm/mach-at91/include/mach/aic.h b/arch/arm/mach-at91/include/mach/aic.h
new file mode 100644
index 000000000000..c1f026b60c62
--- /dev/null
+++ b/arch/arm/mach-at91/include/mach/aic.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: BSD-1-Clause */
+#ifndef __AT91_AIC_H_
+#define __AT91_AIC_H_
+
+#include <linux/compiler.h>
+
+void at91_aic_redir(void __iomem *sfr, u32 key);
+
+#endif
diff --git a/arch/arm/mach-at91/sama5d2.c b/arch/arm/mach-at91/sama5d2.c
index 2f74b0b38df1..c498b0964534 100644
--- a/arch/arm/mach-at91/sama5d2.c
+++ b/arch/arm/mach-at91/sama5d2.c
@@ -3,6 +3,7 @@
#include <common.h>
#include <of.h>
#include <init.h>
+#include <mach/aic.h>
#include <mach/sama5d2.h>
#include <asm/cache-l2x0.h>
#include <asm/mmu.h>
@@ -44,6 +45,7 @@ static int sama5d2_init(void)
if (!of_machine_is_compatible("atmel,sama5d2"))
return 0;
+ at91_aic_redir(SAMA5D2_BASE_SFR, SAMA5D2_AICREDIR_KEY);
sama5d2_can_ram_init();
sama5d2_l2x0_init();
--
2.27.0
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