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linux/arch/arm/mach-exynos
Henrik Grimler 534aaa1802 ARM: exynos: only do SMC_CMD_CPU1BOOT call on Exynos4
On Exynos5 the call is simply ignored by most variants of the
trustzone firmware.  However, on some devices it instead causes the
device to hang, so let's avoid the call for the SoCs where it should
not be needed.

To see that the call is ignored, we can look into sboot/tzsw.  On most
of the Exynos{4,5} devices the part of sboot/tzsw that seem to handle
the secure monitor calls is quite easy to recognise, the SMC number is
compared to known ones, and if equal it branches to the relevant
function.  In assembly this looks something like:

;-- handle_smc:
0x00000514      650070e3       cmn r0, 0x65
0x00000518      0a00000a       beq loc.smc_cmd_reg
0x0000051c      010070e3       cmn r0, 1
0x00000520      6c00000a       beq loc.smc_cmd_init
0x00000524      020070e3       cmn r0, 2
0x00000528      6b00000a       beq loc.smc_cmd_info
0x0000052c      030070e3       cmn r0, 3
0x00000530      6e00000a       beq loc.smc_cmd_sleep
0x00000534      060070e3       cmn r0, 6
0x00000538      ae00000a       beq loc.smc_cmd_save_state
0x0000053c      070070e3       cmn r0, 7
0x00000540      b400000a       beq loc.smc_cmd_standby
0x00000544      2b01001a       bne loc.smc_return_minus1

where above example is from exynos5420-arndale-octa.  As can be seen
the case where r0 is 4 (i.e. SMC_CMD_CPU1BOOT) is not handled.  The
annotations are taken from github.com/hsnaves/exynos5410-firmware,
where a large part of the exynos5410 trustzone firmware has been
reverse-engineered.

Signed-off-by: Henrik Grimler <henrik@grimler.se>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20220118185746.299832-3-henrik@grimler.se
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
2022-01-23 20:12:37 +01:00
..
common.h ARM: exynos: use private samsung_cpu_id copy 2020-08-19 21:10:50 +02:00
exynos-smc.S ARM: use arch_extension directive instead of arch argument 2019-06-19 09:44:25 -07:00
exynos.c ARM: exynos: add missing of_node_put for loop iteration 2021-05-11 08:33:01 -04:00
firmware.c ARM: exynos: only do SMC_CMD_CPU1BOOT call on Exynos4 2022-01-23 20:12:37 +01:00
headsmp.S ARM: smp: remove arch-provided "pen_release" 2019-02-01 22:05:23 +00:00
Kconfig ARM: samsung: Remove HAVE_S3C2410_I2C and use direct dependencies 2021-11-21 17:46:18 +01:00
Makefile ARM: exynos: stop selecting PLAT_SAMSUNG 2020-08-19 21:14:13 +02:00
mcpm-exynos.c ARM: exynos: MCPM: Restore big.LITTLE cpuidle support 2020-06-29 20:27:33 +02:00
platsmp.c ARM: exynos: correct kernel doc in platsmp 2021-04-06 22:30:02 +02:00
pm.c ARM: exynos: use private samsung_cpu_id copy 2020-08-19 21:10:50 +02:00
sleep.S ARM: use arch_extension directive instead of arch argument 2019-06-19 09:44:25 -07:00
smc.h ARM: samsung: Rename Samsung and Exynos to lowercase 2020-01-07 20:44:22 +01:00
suspend.c ARM: samsung: Rename Samsung and Exynos to lowercase 2020-01-07 20:44:22 +01:00