[PATCH] ARM: mxs: Add serial number support for i.MX23, i.MX28 SoCs

[Ivan Zaentsev]

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 at wirenboard.ru>
Suggested-by: Evgeny Boger <boger at 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