rpi3: Implement simple interrupt routing
Implement minimal interrupt routing functions. All interrupts are
treated as non-secure interrupts to be handled by the non-secure world.
Add note to the documentation about disabling FIQs qhen using OP-TEE
with Linux.
Change-Id: I937096542d973925e43ae946c5d0b306d0d95a94
Tested-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/docs/plat/rpi3.rst b/docs/plat/rpi3.rst
index c8e2405..5e535c6 100644
--- a/docs/plat/rpi3.rst
+++ b/docs/plat/rpi3.rst
@@ -243,6 +243,12 @@
BL32_EXTRA1=tee-pager_v2.bin BL32_EXTRA2=tee-pageable_v2.bin``
to put the binaries into the FIP.
+ Note: If OP-TEE is used it may be needed to add the following options to the
+ Linux command line so that the USB driver doesn't use FIQs:
+ ``dwc_otg.fiq_enable=0 dwc_otg.fiq_fsm_enable=0 dwc_otg.nak_holdoff=0``.
+ This will unfortunately reduce the performance of the USB driver. It is needed
+ when using Raspbian, for example.
+
- ``TRUSTED_BOARD_BOOT``: This port supports TBB. Set this option
``TRUSTED_BOARD_BOOT=1`` to enable it. In order to use TBB, you might
want to set ``GENERATE_COT=1`` to let the contents of the FIP automatically
diff --git a/plat/rpi3/rpi3_common.c b/plat/rpi3/rpi3_common.c
index 65f5e7a..98cf534 100644
--- a/plat/rpi3/rpi3_common.c
+++ b/plat/rpi3/rpi3_common.c
@@ -5,6 +5,7 @@
*/
#include <arch_helpers.h>
+#include <assert.h>
#include <bl_common.h>
#include <console.h>
#include <debug.h>
@@ -198,15 +199,21 @@
uint32_t plat_ic_get_pending_interrupt_type(void)
{
+ ERROR("rpi3: Interrupt routed to EL3.\n");
return INTR_TYPE_INVAL;
}
-uint32_t plat_interrupt_type_to_line(uint32_t type,
- uint32_t security_state)
+uint32_t plat_interrupt_type_to_line(uint32_t type, uint32_t security_state)
{
- /* It is not expected to receive an interrupt route to EL3.
- * Hence panic() to flag error.
- */
- ERROR("Interrupt not expected to be routed to EL3");
- panic();
+ assert((type == INTR_TYPE_S_EL1) || (type == INTR_TYPE_EL3) ||
+ (type == INTR_TYPE_NS));
+
+ assert(sec_state_is_valid(security_state));
+
+ /* Non-secure interrupts are signalled on the IRQ line always. */
+ if (type == INTR_TYPE_NS)
+ return __builtin_ctz(SCR_IRQ_BIT);
+
+ /* Secure interrupts are signalled on the FIQ line always. */
+ return __builtin_ctz(SCR_FIQ_BIT);
}