Commit 1168935b authored by Sebastian Reichel's avatar Sebastian Reichel Committed by Shawn Guo
Browse files

soc: imx: add i.MX51/i.MX53 unique id support 



i.MX51 and i.MX53 SoCs have a 64-bit SoC unique ID stored in IIM,
which can be used as SoC serial number. The same feature is already
implemented for i.MX6/i.MX7, so this complements support to earlier
SoCs.

Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent a38fd874

drivers/soc/imx/soc-imx.c

+12 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ 
#include <soc/imx/cpu.h>

#include <soc/imx/revision.h>



#define IIM_UID		0x820



#define OCOTP_UID_H	0x420

#define OCOTP_UID_L	0x410
@@ -32,6 +34,7 @@ static int __init imx_soc_device_init(void) 
	u64 soc_uid = 0;

	u32 val;

	int ret;

	int i;



	if (of_machine_is_compatible("fsl,ls1021a"))

		return 0;
@@ -68,9 +71,11 @@ static int __init imx_soc_device_init(void) 
		soc_id = "i.MX35";

		break;

	case MXC_CPU_MX51:

		ocotp_compat = "fsl,imx51-iim";

		soc_id = "i.MX51";

		break;

	case MXC_CPU_MX53:

		ocotp_compat = "fsl,imx53-iim";

		soc_id = "i.MX53";

		break;

	case MXC_CPU_IMX6SL:
@@ -153,6 +158,13 @@ static int __init imx_soc_device_init(void) 
			regmap_read(ocotp, OCOTP_ULP_UID_1, &val);

			soc_uid <<= 16;

			soc_uid |= val & 0xffff;

		} else if (__mxc_cpu_type == MXC_CPU_MX51 ||

			   __mxc_cpu_type == MXC_CPU_MX53) {

			for (i=0; i < 8; i++) {

				regmap_read(ocotp, IIM_UID + i*4, &val);

				soc_uid <<= 8;

				soc_uid |= (val & 0xff);

			}

		} else {

			regmap_read(ocotp, OCOTP_UID_H, &val);

			soc_uid = val;