Commit 4ba79e25 authored by Ivan Zaentsev's avatar Ivan Zaentsev Committed by Shawn Guo
Browse files

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: default avatarIvan Zaentsev <ivan.zaentsev@wirenboard.ru>
Suggested-by: default avatarEvgeny Boger <boger@wirenboard.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 53cc6bc6

arch/arm/mach-mxs/mach-mxs.c

+19 −0
Original line number Diff line number Diff line
@@ -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;

CRA Git | Maintained and supported by SUSTech CRA and CCSE