arch: arm: meson: support Amlogic chip_id v1 and v2
Patch introduces:
* chip_id API - useful for various things, but used now for
device_id (did) generation as mentioned in [1] on our private board
code. Our device_id is calculated by means of permutations of
chip_id value.
* new SoCs (a1, s4, etc) are usually coming with the support of chip_id
v2 right away, whereas secure monitors on old SoCs (like axg, g12b,
g12a, etc) may support only chip_id v1. Chip_id API handles both
cases
* meson_sm_get_serial() is described via chip_id API.
Links:
[1] https://lore.kernel.org/linux-arm-kernel/202311242104.RjBPI3uI-lkp@intel.com/T/#m630fbeea6a6e7d531290b5c0af205af4fb979757
Signed-off-by: Viacheslav Bocharov <adeep@lexina.in>
Co-developed-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Signed-off-by: Evgeny Bachinin <EABachinin@salutedevices.com>
Link: https://lore.kernel.org/r/20250210-meson_chip_id_all_vers-v1-3-b98f8b6880b8@salutedevices.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/arch/arm/include/asm/arch-meson/boot.h b/arch/arm/include/asm/arch-meson/boot.h
index c67d12d..a11dfde 100644
--- a/arch/arm/include/asm/arch-meson/boot.h
+++ b/arch/arm/include/asm/arch-meson/boot.h
@@ -21,4 +21,18 @@
int meson_get_soc_rev(char *buff, size_t buff_len);
+/**
+ * meson_get_socinfo - retrieve cpu_id of the Amlogic SoC
+ *
+ * The value in the following format is read from register:
+ * +-----------+------------+------------+------------+
+ * | family_id | package_id | chip_rev | layout_rev |
+ * +-----------+------------+------------+------------+
+ * | 31 24 | 23 16 | 15 8 | 7 0 |
+ * +-----------+------------+------------+------------+
+ *
+ * Return: 4 bytes value of cpu_id on success or 0 on failure.
+ */
+u32 meson_get_socinfo(void);
+
#endif /* __MESON_BOOT_H__ */