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arm: omap-common: add secure smc entry

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Add an interface for calling secure ROM APIs across a range of OMAP and
OMAP compatible high-security (HS) device variants. While at it, also
perform minor cleanup/alignment without any change in functionality.

Signed-off-by: Daniel Allred <d-allred@ti.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Daniel Allred 2016-06-27 09:19:17 -05:00 committed by Tom Rini
parent ec6f61003b
commit 51d0638650
2 changed files with 42 additions and 9 deletions
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45
arch/arm/cpu/armv7/omap-common/lowlevel_init.S
View File

@ -16,9 +16,10 @@
#include <asm/arch/spl.h>
#include <linux/linkage.h>
.arch_extension sec
#ifdef CONFIG_SPL
ENTRY(save_boot_params)
ldr r1, =OMAP_SRAM_SCRATCH_BOOT_PARAMS
str r0, [r1]
b save_boot_params_ret
@ -26,14 +27,40 @@ ENDPROC(save_boot_params)
#endif
ENTRY(omap_smc1)
PUSH {r4-r12, lr} @ save registers - ROM code may pollute
push {r4-r12, lr} @ save registers - ROM code may pollute
@ our registers
MOV r12, r0 @ Service
MOV r0, r1 @ Argument
DSB
DMB
.word 0xe1600070 @ SMC #0 - hand assembled for GCC versions
@ call ROM Code API for the service requested
mov r12, r0 @ Service
mov r0, r1 @ Argument
POP {r4-r12, pc}
dsb
dmb
smc 0 @ SMC #0 to enter monitor mode
@ call ROM Code API for the service requested
pop {r4-r12, pc}
ENDPROC(omap_smc1)
ENTRY(omap_smc_sec)
push {r4-r12, lr} @ save registers - ROM code may pollute
@ our registers
mov r6, #0xFF @ Indicate new Task call
mov r12, #0x00 @ Secure Service ID in R12
dsb
dmb
smc 0 @ SMC #0 to enter monitor mode
b omap_smc_sec_end @ exit at end of the service execution
nop
@ In case of IRQ happening in Secure, then ARM will branch here.
@ At that moment, IRQ will be pending and ARM will jump to Non Secure
@ IRQ handler
mov r12, #0xFE
dsb
dmb
smc 0 @ SMC #0 to enter monitor mode
omap_smc_sec_end:
pop {r4-r12, pc}
ENDPROC(omap_smc_sec)

6
arch/arm/include/asm/omap_common.h
View File

@ -627,6 +627,12 @@ void recalibrate_iodelay(void);
void omap_smc1(u32 service, u32 val);
/*
* Low-level helper function used when performing secure ROM calls on high-
* security (HS) device variants by doing a specially-formed smc entry.
*/
u32 omap_smc_sec(u32 service, u32 proc_id, u32 flag, u32 *params);
void enable_edma3_clocks(void);
void disable_edma3_clocks(void);