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arch: arm: meson: support Amlogic chip_id v1 and v2

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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>
This commit is contained in:
Evgeny Bachinin
2025-02-10 20:50:16 +03:00
committed by Neil Armstrong
parent e6d57a5a48
commit dedea0d18d
4 changed files with 176 additions and 13 deletions
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14
arch/arm/include/asm/arch-meson/boot.h
View File

@@ -21,4 +21,18 @@ int meson_get_boot_device(void);
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__ */

48
arch/arm/include/asm/arch-meson/sm.h
View File

@@ -6,6 +6,8 @@
#ifndef __MESON_SM_H__
#define __MESON_SM_H__
#include <asm/types.h>
/**
* meson_sm_read_efuse - read efuse memory into buffer
*
@@ -27,16 +29,60 @@ ssize_t meson_sm_read_efuse(uintptr_t offset, void *buffer, size_t size);
ssize_t meson_sm_write_efuse(uintptr_t offset, void *buffer, size_t size);
#define SM_SERIAL_SIZE 12
#define MESON_CPU_ID_SZ 4
#define MESON_CHIP_ID_SZ 16
/**
* meson_sm_get_serial - read chip unique id into buffer
* union meson_cpu_id - Amlogic cpu_id.
* @raw: buffer to hold the cpu_id value as sequential bytes.
* @val: cpu_id represented as 32 bit value.
*/
union meson_cpu_id {
u8 raw[MESON_CPU_ID_SZ];
u32 val;
};
/**
* struct meson_sm_chip_id - Amlogic chip_id.
* @cpu_id: cpu_id value, which is distinct from socinfo in that the order of
* PACK & MINOR bytes are swapped according to Amlogic chip_id format.
* @serial: 12 byte unique SoC number, identifying particular die, read
* usually from efuse OTP storage. Serial comes in little-endian
* order.
*/
struct meson_sm_chip_id {
union meson_cpu_id cpu_id;
u8 serial[SM_SERIAL_SIZE];
};
/**
* meson_sm_get_serial - read chip unique serial (OTP data) into buffer
*
* @buffer: pointer to buffer
* @size: buffer size.
*
* Serial is returned in big-endian order.
*
* @return: zero on success or -errno on failure
*/
int meson_sm_get_serial(void *buffer, size_t size);
/**
* meson_sm_get_chip_id - read Amlogic chip_id
*
* @chip_id: pointer to buffer capable to hold the struct meson_sm_chip_id
*
* Amlogic SoCs support 2 versions of chip_id. Function requests the newest
* one (v2), but if chip_id v2 is not supported, then secure monitor returns
* v1. All differences between v1 and v2 versions are handled by this function
* and chip_id is returned in unified format.
*
* chip_id contains serial, which is returned here in little-endian order.
*
* @return: 0 on success or -errno on failure
*/
int meson_sm_get_chip_id(struct meson_sm_chip_id *chip_id);
enum {
REBOOT_REASON_COLD = 0,
REBOOT_REASON_NORMAL = 1,