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stm32mp1: introduce shared resources support 

STM32MP1 SoC includes peripheral interfaces that can be assigned to
the secure world, or that can be opened to the non-secure world.

This change introduces the basics of a driver that manages such
resources which assignation is done at run time. It currently offers
API functions that state whether a service exposed to non-secure
world has permission to access a targeted clock or reset controller.

Change-Id: Iff20028f41586bc501085488c03546ffe31046d8
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
This commit is contained in:
Etienne Carriere 2019-12-08 08:14:03 +01:00
parent 3fbec43648
commit 47cf5d3f28
3 changed files with 40 additions and 0 deletions
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18
plat/st/common/include/stm32mp_shared_resources.h Normal file
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@ -0,0 +1,18 @@
/*
* Copyright (c) 2017-2020, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef STM32MP_SHARED_RESOURCES_H
#define STM32MP_SHARED_RESOURCES_H
#include <stdbool.h>
/* Return true if @clock_id is shared by secure and non-secure worlds */
bool stm32mp_nsec_can_access_clock(unsigned long clock_id);
/* Return true if and only if @reset_id relates to a non-secure peripheral */
bool stm32mp_nsec_can_access_reset(unsigned int reset_id);
#endif /* STM32MP_SHARED_RESOURCES_H */

3
plat/st/stm32mp1/sp_min/sp_min-stm32mp1.mk
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@ -6,10 +6,13 @@
SP_MIN_WITH_SECURE_FIQ := 1
BL32_CFLAGS += -DSTM32MP_SHARED_RESOURCES
BL32_SOURCES += drivers/st/etzpc/etzpc.c \
plat/common/aarch32/platform_mp_stack.S \
plat/st/stm32mp1/sp_min/sp_min_setup.c \
plat/st/stm32mp1/stm32mp1_pm.c \
plat/st/stm32mp1/stm32mp1_shared_resources.c \
plat/st/stm32mp1/stm32mp1_topology.c
# Generic GIC v2

19
plat/st/stm32mp1/stm32mp1_shared_resources.c Normal file
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@ -0,0 +1,19 @@
/*
* Copyright (c) 2017-2020, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stm32mp_shared_resources.h>
/* Currently allow full access by non-secure to platform clock services */
bool stm32mp_nsec_can_access_clock(unsigned long clock_id)
{
return true;
}
/* Currently allow full access by non-secure to platform reset services */
bool stm32mp_nsec_can_access_reset(unsigned int reset_id)
{
return true;
}