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Subject[PATCH] ARM: mxs: Add serial number support for i.MX23, i.MX28 SoCs
Date
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>
---
arch/arm/mach-mxs/mach-mxs.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c
index c109f47e9cbc..af96368cc16a 100644
--- a/arch/arm/mach-mxs/mach-mxs.c
+++ b/arch/arm/mach-mxs/mach-mxs.c
@@ -23,6 +23,7 @@
#include <asm/mach/map.h>
#include <asm/mach/time.h>
#include <asm/system_misc.h>
+#include <asm/system_info.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 +400,22 @@ 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;
--
2.25.1
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