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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>
This commit is contained in:
Antonio Nino Diaz 2018-07-11 21:00:32 +01:00
parent df4c512d47
commit d35de55e55
2 changed files with 20 additions and 7 deletions
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6
docs/plat/rpi3.rst
View File

@ -243,6 +243,12 @@ The following build options are supported:
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

21
plat/rpi3/rpi3_common.c
View File

@ -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 @@ unsigned int plat_get_syscnt_freq2(void)
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);
}