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| author |   Ivan Zaentsev <ivan.zaentsev@wirenboard.ru> | 2020-11-16 19:58:26 +0300 |
|---|---|---|
| committer |   Shawn Guo <shawnguo@kernel.org> | 2020-11-30 17:31:29 +0800 |
| commit | 4ba79e25d7f1a7394021ba4c215a7ecdcc270fb6 (patch) | |
| tree | 7ceb9600023b8aac8e9b8c2ccaa7ba861fed3c55 | |
| parent | ARM: imx: mach-imx6q: correctly identify i.MX6QP SoCs (diff) | |
| download | linux-dev-4ba79e25d7f1a7394021ba4c215a7ecdcc270fb6.tar.xz linux-dev-4ba79e25d7f1a7394021ba4c215a7ecdcc270fb6.zip | |
ARM: mxs: Add serial number support for i.MX23, i.MX28 SoCs
i.MX23 and i.MX28 SoCs unique identifiers are factory-programmed
in On-Chip OTP memory. i.MX28's 64-bit unique id is in
HW_OCOTP_OPS2:HW_OCOTP_OPS3 (see MCIMX28 Ref. Man., sec. 20.4.22-23).
i.MX23 provides 32-bit long unique id in HW_OCOTP_OPS3.
Though not clearly documented, there is a clue in sec. 35.9.3.
The unique id is reported in /sys/devices/soc0/serial_number
and in /proc/cpuinfo
Signed-off-by: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru>
Suggested-by: Evgeny Boger <boger@wirenboard.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
| -rw-r--r-- | arch/arm/mach-mxs/mach-mxs.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c index c109f47e9cbc..25c9d184fa4c 100644 --- a/arch/arm/mach-mxs/mach-mxs.c +++ b/arch/arm/mach-mxs/mach-mxs.c @@ -22,6 +22,7 @@ #include <asm/mach/arch.h> #include <asm/mach/map.h> #include <asm/mach/time.h> +#include <asm/system_info.h> #include <asm/system_misc.h> #include "pm.h" @@ -51,6 +52,9 @@ #define MXS_CLR_ADDR 0x8 #define MXS_TOG_ADDR 0xc +#define HW_OCOTP_OPS2 19 /* offset 0x150 */ +#define HW_OCOTP_OPS3 20 /* offset 0x160 */ + static u32 chipid; static u32 socid; @@ -379,6 +383,8 @@ static void __init mxs_machine_init(void) struct device *parent; struct soc_device *soc_dev; struct soc_device_attribute *soc_dev_attr; + u64 soc_uid = 0; + const u32 *ocotp = mxs_get_ocotp(); int ret; soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL); @@ -394,8 +400,21 @@ static void __init mxs_machine_init(void) soc_dev_attr->soc_id = mxs_get_soc_id(); soc_dev_attr->revision = mxs_get_revision(); + if (socid == HW_DIGCTL_CHIPID_MX23) { + soc_uid = system_serial_low = ocotp[HW_OCOTP_OPS3]; + } else if (socid == HW_DIGCTL_CHIPID_MX28) { + soc_uid = system_serial_high = ocotp[HW_OCOTP_OPS2]; + soc_uid <<= 32; + system_serial_low = ocotp[HW_OCOTP_OPS3]; + soc_uid |= system_serial_low; + } + + if (soc_uid) + soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid); + soc_dev = soc_device_register(soc_dev_attr); if (IS_ERR(soc_dev)) { + kfree(soc_dev_attr->serial_number); kfree(soc_dev_attr->revision); kfree(soc_dev_attr); return; |