SAMA5D4: Add configuration to redirect all interrupts to the AIC

arch/arm/src/sama5/Kconfig

@@ -80,7 +80,6 @@ config SAMA5_HAVE_HSMCI2
 config SAMA5_HAVE_SAIC
 	bool
 	default n
-	select ARMV7A_DECODEFIQ
 
 config SAMA5_HAVE_SBM
 	bool
@@ -276,6 +275,12 @@ config SAMA5_SMD
 	bool "SMD Soft Modem (SMD)"
 	default n
 
+config SAMA5_SAIC
+	bool "Secure Advanced Interrupt Controller (SAIC)"
+	default n
+	depends on SAMA5_HAVE_SAIC
+	select ARMV7A_DECODEFIQ
+
 config SAMA5_UART0
 	bool "UART 0"
 	default y

arch/arm/src/sama5/chip/sam_sfr.h

@@ -69,6 +69,7 @@
 #ifdef ATSAMA5D4
 #  define SAM_SFR_SN0_OFFSET        0x004c /* Serial Number 0 Register */
 #  define SAM_SFR_SN1_OFFSET        0x0050 /* Serial Number 1 Register */
+#  define SAM_SFR_AICREDIR_OFFSET   0x0054 /* AIC Redirection Register */
 #endif
 
 /* SFR Register Addresses ***********************************************************/
@@ -88,8 +89,9 @@
 #define SAM_SFR_EBICFG              (SAM_SFR_VBASE+SAM_SFR_EBICFG_OFFSET)
 
 #ifdef ATSAMA5D4
-#  define SAM_SFR_SN0              (SAM_SFR_VBASE+SAM_SFR_SN0_OFFSET)
-#  define SAM_SFR_SN1              (SAM_SFR_VBASE+SAM_SFR_SN1_OFFSET)
+#  define SAM_SFR_SN0               (SAM_SFR_VBASE+SAM_SFR_SN0_OFFSET)
+#  define SAM_SFR_SN1               (SAM_SFR_VBASE+SAM_SFR_SN1_OFFSET)
+#  define SAM_SFR_AICREDIR          (SAM_SFR_VBASE+SAM_SFR_AICREDIR_OFFSET)
 #endif
 
 /* SFR Register Bit Definitions *****************************************************/
@@ -215,6 +217,13 @@
 #ifdef ATSAMA5D4
 /* Serial Number 0 Register (32-bit value) */
 /* Serial Number 1 Register (32-bit value) */
+
+/* AIC Redirection Register */
+
+#  define SFR_AICREDIR_ENABLE       (1 << 0)  /* Bit 0: 1=All interrupts to AIC */
+#  define SFR_AICREDIR_DISABLE      (0)       /* Bit 0: 0=Secure interrupts to SAIC */
+#  define SFR_AICREDIR_KEY          (0x5f67b102) /* Bits 1-31: Access key */
+
 #endif
 
 #endif /* __ARCH_ARM_SRC_SAMA5_CHIP_SAM_SFR_H */

arch/arm/src/sama5/sam_irq.c

@@ -61,6 +61,7 @@
 #include "chip/sam_aic.h"
 #include "chip/sam_matrix.h"
 #include "chip/sam_aximx.h"
+#include "chip/sam_sfr.h"
 
 #include "sam_irq.h"
 
@@ -100,7 +101,7 @@ static const uint8_t g_srctype[SCRTYPE_NTYPES] =
  * peripheral interrupts are secured or not.
  */
 
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
 static const uint32_t g_h64mxpids[3] =
 {
   H64MX_SPSELR0_PIDS, H64MX_SPSELR1_PIDS, H64MX_SPSELR2_PIDS
@@ -260,7 +261,7 @@ static uint32_t *sam_fiqhandler(int irq, uint32_t *regs)
  *
  ****************************************************************************/
 
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
 static bool sam_aic_issecure(uint32_t irq)
 {
   uintptr_t regaddr;
@@ -294,6 +295,46 @@ static bool sam_aic_issecure(uint32_t irq)
 }
 #endif
 
+/****************************************************************************
+ * Name: sam_aic_redirection
+ *
+ * Description:
+ *   Redirect all interrupts to the AIC.  This function is only compiled if
+ *   (1) the architecture supports an SAIC (CONFIG_SAMA5_HAVE_SAIC), but (2)
+ *   Use of the SAIC has not been selected (!CONFIG_SAMA5_SAIC).
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_SAMA5_HAVE_SAIC) && !defined(CONFIG_SAMA5_SAIC)
+static void sam_aic_redirection(void)
+{
+  unsigned int regval;
+
+  /* Check if interrupts are already redirected to the AIC */
+
+  regval = getreg32(SAM_SFR_AICREDIR);
+  if ((regval & SFR_AICREDIR_ENABLE) == 0)
+    {
+      /* Enable redirection of all interrupts to the AIC */
+
+      regval  = getreg32(SAM_SFR_SN1);
+      regval ^= SFR_AICREDIR_KEY;
+      regval |= SFR_AICREDIR_ENABLE;
+      putreg32(regval, SAM_SFR_AICREDIR);
+
+#if defined(CONFIG_DEBUG_IRQ)
+      /* Check if redirection was successfully enabled */
+
+      regval = getreg32(SAM_SFR_AICREDIR);
+      lldbg("Interrupts %s redirected to the AIC\n",
+           (regval & SFR_AICREDIR_ENABLE) != 0 ? "ARE" : "NOT");
+#endif
+    }
+}
+#else
+#  define sam_aic_redirection()
+#endif
+
 /****************************************************************************
  * Name: sam_aic_initialize
  *
@@ -395,11 +436,15 @@ void up_irqinitialize(void)
   }
 #endif
 
+  /* Redirect all interrupts to the AIC if so configured */
+
+  sam_aic_redirection();
+
   /* Initialize the Advanced Interrupt Controller (AIC) */
 
   sam_aic_initialize(SAM_AIC_VBASE);
 
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
   /* Initialize the Secure Advanced Interrupt Controller (SAIC) */
 
   sam_aic_initialize(SAM_SAIC_VBASE);
@@ -602,7 +647,7 @@ uint32_t *arm_decodeirq(uint32_t *regs)
   return sam_decodeirq(SAM_AIC_VBASE, regs);
 }
 
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
 /* This is the entry point from the ARM FIQ vector handler */
 
 uint32_t *arm_decodefiq(FAR uint32_t *regs)
@@ -674,7 +719,7 @@ static void sam_disable_irq(uintptr_t base, int irq)
 
 void up_disable_irq(int irq)
 {
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
   if (sam_aic_issecure(irq))
     {
       sam_disable_irq(SAM_SAIC_VBASE, irq);
@@ -726,7 +771,7 @@ static void sam_enable_irq(uintptr_t base, int irq)
 
 void up_enable_irq(int irq)
 {
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
   if (sam_aic_issecure(irq))
     {
       sam_enable_irq(SAM_SAIC_VBASE, irq);
@@ -802,7 +847,7 @@ static int sam_prioritize_irq(uint32_t base, int irq, int priority)
 
 int up_prioritize_irq(int irq, int priority)
 {
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
   if (sam_aic_issecure(irq))
     {
       sam_prioritize_irq(SAM_SAIC_VBASE, irq, priority);
@@ -860,7 +905,7 @@ static void _sam_irq_srctype(uintptr_t base, int irq,
 
 void sam_irq_srctype(int irq, enum sam_srctype_e srctype)
 {
-#if defined(CONFIG_SAMA5_HAVE_SAIC)
+#if defined(CONFIG_SAMA5_SAIC)
   if (sam_aic_issecure(irq))
     {
       _sam_irq_srctype(SAM_SAIC_VBASE, irq, srctype);