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ARM: OMAP2+: Introduce check for OP-TEE in omap_secure_init()

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This check and associated flag can be used to signal the presence
of OP-TEE on the platform. This can be used to determine which
SMC calls to make to perform secure operations.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Andrew F. Davis
2020-01-02 16:19:41 -05:00
committed by Tony Lindgren
parent db711893ea
commit dbebc8bfe9
2 changed files with 22 additions and 0 deletions
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19
arch/arm/mach-omap2/omap-secure.c
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@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <asm/cacheflush.h>
#include <asm/memblock.h>
@@ -20,6 +21,23 @@
static phys_addr_t omap_secure_memblock_base;
bool optee_available;
static void __init omap_optee_init_check(void)
{
struct device_node *np;
/*
* We only check that the OP-TEE node is present and available. The
* OP-TEE kernel driver is not needed for the type of interaction made
* with OP-TEE here so the driver's status is not checked.
*/
np = of_find_node_by_path("/firmware/optee");
if (np && of_device_is_available(np))
optee_available = true;
of_node_put(np);
}
/**
* omap_sec_dispatcher: Routine to dispatch low power secure
* service routines
@@ -166,4 +184,5 @@ u32 rx51_secure_rng_call(u32 ptr, u32 count, u32 flag)
void __init omap_secure_init(void)
{
omap_optee_init_check();
}