Commit 8267ff89 authored by Anson Huang's avatar Anson Huang Committed by Shawn Guo
Browse files

ARM: imx: Add serial number support for i.MX6/7 SoCs 



i.MX6/7 SoCs have a 64-bit SoC unique ID stored in OCOTP,
it can be used as SoC serial number, add this support for
i.MX6Q/6DL/6SL/6SX/6SLL/6UL/6ULL/6ULZ/7D, see below example
on i.MX6Q:

root@imx6qpdlsolox:~# cat /sys/devices/soc0/serial_number
240F31D4E1FDFCA7

Signed-off-by: default avatarAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 427fca60

arch/arm/mach-imx/cpu.c

+37 −1
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <linux/err.h>

#include <linux/mfd/syscon.h>

#include <linux/module.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/sys_soc.h>



#include "hardware.h"

#include "common.h"



#define OCOTP_UID_H	0x420

#define OCOTP_UID_L	0x410



unsigned int __mxc_cpu_type;

static unsigned int imx_soc_revision;
@@ -76,9 +81,13 @@ void __init imx_aips_allow_unprivileged_access( 
struct device * __init imx_soc_device_init(void)

{

	struct soc_device_attribute *soc_dev_attr;

	const char *ocotp_compat = NULL;

	struct soc_device *soc_dev;

	struct device_node *root;

	struct regmap *ocotp;

	const char *soc_id;

	u64 soc_uid = 0;

	u32 val;

	int ret;



	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
@@ -119,30 +128,39 @@ struct device * __init imx_soc_device_init(void) 
		soc_id = "i.MX53";

		break;

	case MXC_CPU_IMX6SL:

		ocotp_compat = "fsl,imx6sl-ocotp";

		soc_id = "i.MX6SL";

		break;

	case MXC_CPU_IMX6DL:

		ocotp_compat = "fsl,imx6q-ocotp";

		soc_id = "i.MX6DL";

		break;

	case MXC_CPU_IMX6SX:

		ocotp_compat = "fsl,imx6sx-ocotp";

		soc_id = "i.MX6SX";

		break;

	case MXC_CPU_IMX6Q:

		ocotp_compat = "fsl,imx6q-ocotp";

		soc_id = "i.MX6Q";

		break;

	case MXC_CPU_IMX6UL:

		ocotp_compat = "fsl,imx6ul-ocotp";

		soc_id = "i.MX6UL";

		break;

	case MXC_CPU_IMX6ULL:

		ocotp_compat = "fsl,imx6ul-ocotp";

		soc_id = "i.MX6ULL";

		break;

	case MXC_CPU_IMX6ULZ:

		ocotp_compat = "fsl,imx6ul-ocotp";

		soc_id = "i.MX6ULZ";

		break;

	case MXC_CPU_IMX6SLL:

		ocotp_compat = "fsl,imx6sll-ocotp";

		soc_id = "i.MX6SLL";

		break;

	case MXC_CPU_IMX7D:

		ocotp_compat = "fsl,imx7d-ocotp";

		soc_id = "i.MX7D";

		break;

	case MXC_CPU_IMX7ULP:
@@ -153,18 +171,36 @@ struct device * __init imx_soc_device_init(void) 
	}

	soc_dev_attr->soc_id = soc_id;



	if (ocotp_compat) {

		ocotp = syscon_regmap_lookup_by_compatible(ocotp_compat);

		if (IS_ERR(ocotp))

			pr_err("%s: failed to find %s regmap!\n", __func__, ocotp_compat);



		regmap_read(ocotp, OCOTP_UID_H, &val);

		soc_uid = val;

		regmap_read(ocotp, OCOTP_UID_L, &val);

		soc_uid <<= 32;

		soc_uid |= val;

	}



	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",

					   (imx_soc_revision >> 4) & 0xf,

					   imx_soc_revision & 0xf);

	if (!soc_dev_attr->revision)

		goto free_soc;



	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);

	if (!soc_dev_attr->serial_number)

		goto free_rev;



	soc_dev = soc_device_register(soc_dev_attr);

	if (IS_ERR(soc_dev))

		goto free_rev;

		goto free_serial_number;



	return soc_device_to_device(soc_dev);



free_serial_number:

	kfree(soc_dev_attr->serial_number);

free_rev:

	kfree(soc_dev_attr->revision);

free_soc:

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