arch/arm/mach-stm32mp/bsec.c - uboot-imx - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
  */

 #include <common.h>
 #include <dm.h>
 #include <misc.h>
 #include <asm/io.h>
 #include <linux/iopoll.h>

 #define BSEC_OTP_MAX_VALUE		95

 #define BSEC_TIMEOUT_US			10000

 /* BSEC REGISTER OFFSET (base relative) */
 #define BSEC_OTP_CONF_OFF		0x000
 #define BSEC_OTP_CTRL_OFF		0x004
 #define BSEC_OTP_WRDATA_OFF		0x008
 #define BSEC_OTP_STATUS_OFF		0x00C
 #define BSEC_OTP_LOCK_OFF		0x010
 #define BSEC_DISTURBED_OFF		0x01C
 #define BSEC_ERROR_OFF			0x034
 #define BSEC_SPLOCK_OFF			0x064 /* Program safmem sticky lock */
 #define BSEC_SWLOCK_OFF			0x07C /* write in OTP sticky lock */
 #define BSEC_SRLOCK_OFF			0x094 /* shadowing sticky lock */
 #define BSEC_OTP_DATA_OFF		0x200

 /* BSEC_CONFIGURATION Register MASK */
 #define BSEC_CONF_POWER_UP		0x001

 /* BSEC_CONTROL Register */
 #define BSEC_READ			0x000
 #define BSEC_WRITE			0x100

 /* LOCK Register */
 #define OTP_LOCK_MASK			0x1F
 #define OTP_LOCK_BANK_SHIFT		0x05
 #define OTP_LOCK_BIT_MASK		0x01

 /* STATUS Register */
 #define BSEC_MODE_BUSY_MASK		0x08
 #define BSEC_MODE_PROGFAIL_MASK		0x10
 #define BSEC_MODE_PWR_MASK		0x20

 /*
  * OTP Lock services definition
  * Value must corresponding to the bit number in the register
  */
 #define BSEC_LOCK_PROGRAM		0x04

 /**
  * bsec_check_error() - Check status of one otp
  * @base: base address of bsec IP
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: 0 if no error, -EAGAIN or -ENOTSUPP
  */
 static u32 bsec_check_error(u32 base, u32 otp)
 {
 	u32 bit;
 	u32 bank;

 	bit = 1 << (otp & OTP_LOCK_MASK);
 	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);

 	if (readl(base + BSEC_DISTURBED_OFF + bank) & bit)
 		return -EAGAIN;
 	else if (readl(base + BSEC_ERROR_OFF + bank) & bit)
 		return -ENOTSUPP;

 	return 0;
 }

 /**
  * bsec_lock() - manage lock for each type SR/SP/SW
  * @address: address of bsec IP register
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: true if locked else false
  */
 static bool bsec_read_lock(u32 address, u32 otp)
 {
 	u32 bit;
 	u32 bank;

 	bit = 1 << (otp & OTP_LOCK_MASK);
 	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);

 	return !!(readl(address + bank) & bit);
 }

 /**
  * bsec_read_SR_lock() - read SR lock (Shadowing)
  * @base: base address of bsec IP
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: true if locked else false
  */
 static bool bsec_read_SR_lock(u32 base, u32 otp)
 {
 	return bsec_read_lock(base + BSEC_SRLOCK_OFF, otp);
 }

 /**
  * bsec_read_SP_lock() - read SP lock (program Lock)
  * @base: base address of bsec IP
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: true if locked else false
  */
 static bool bsec_read_SP_lock(u32 base, u32 otp)
 {
 	return bsec_read_lock(base + BSEC_SPLOCK_OFF, otp);
 }

 /**
  * bsec_SW_lock() - manage SW lock (Write in Shadow)
  * @base: base address of bsec IP
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: true if locked else false
  */
 static bool bsec_read_SW_lock(u32 base, u32 otp)
 {
 	return bsec_read_lock(base + BSEC_SWLOCK_OFF, otp);
 }

 /**
  * bsec_power_safmem() - Activate or deactivate safmem power
  * @base: base address of bsec IP
  * @power: true to power up , false to power down
  * Return: 0 if succeed
  */
 static int bsec_power_safmem(u32 base, bool power)
 {
 	u32 val;
 	u32 mask;

 	if (power) {
 		setbits_le32(base + BSEC_OTP_CONF_OFF, BSEC_CONF_POWER_UP);
 		mask = BSEC_MODE_PWR_MASK;
 	} else {
 		clrbits_le32(base + BSEC_OTP_CONF_OFF, BSEC_CONF_POWER_UP);
 		mask = 0;
 	}

 	/* waiting loop */
 	return readl_poll_timeout(base + BSEC_OTP_STATUS_OFF,
 				  val, (val & BSEC_MODE_PWR_MASK) == mask,
 				  BSEC_TIMEOUT_US);
 }

 /**
  * bsec_shadow_register() - copy safmen otp to bsec data
  * @base: base address of bsec IP
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: 0 if no error
  */
 static int bsec_shadow_register(u32 base, u32 otp)
 {
 	u32 val;
 	int ret;
 	bool power_up = false;

 	/* check if shadowing of otp is locked */
 	if (bsec_read_SR_lock(base, otp))
 		pr_debug("bsec : OTP %d is locked and refreshed with 0\n", otp);

 	/* check if safemem is power up */
 	val = readl(base + BSEC_OTP_STATUS_OFF);
 	if (!(val & BSEC_MODE_PWR_MASK)) {
 		ret = bsec_power_safmem(base, true);
 		if (ret)
 			return ret;
 		power_up = 1;
 	}
 	/* set BSEC_OTP_CTRL_OFF with the otp value*/
 	writel(otp | BSEC_READ, base + BSEC_OTP_CTRL_OFF);

 	/* check otp status*/
 	ret = readl_poll_timeout(base + BSEC_OTP_STATUS_OFF,
 				 val, (val & BSEC_MODE_BUSY_MASK) == 0,
 				 BSEC_TIMEOUT_US);
 	if (ret)
 		return ret;

 	ret = bsec_check_error(base, otp);

 	if (power_up)
 		bsec_power_safmem(base, false);

 	return ret;
 }

 /**
  * bsec_read_shadow() - read an otp data value from shadow
  * @base: base address of bsec IP
  * @val: read value
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: 0 if no error
  */
 static int bsec_read_shadow(u32 base, u32 *val, u32 otp)
 {
 	*val = readl(base + BSEC_OTP_DATA_OFF + otp * sizeof(u32));

 	return bsec_check_error(base, otp);
 }

 /**
  * bsec_write_shadow() - write value in BSEC data register in shadow
  * @base: base address of bsec IP
  * @val: value to write
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * Return: 0 if no error
  */
 static int bsec_write_shadow(u32 base, u32 val, u32 otp)
 {
 	/* check if programming of otp is locked */
 	if (bsec_read_SW_lock(base, otp))
 		pr_debug("bsec : OTP %d is lock, write will be ignore\n", otp);

 	writel(val, base + BSEC_OTP_DATA_OFF + otp * sizeof(u32));

 	return bsec_check_error(base, otp);
 }

 /**
  * bsec_program_otp() - program a bit in SAFMEM
  * @base: base address of bsec IP
  * @val: value to program
  * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
  * after the function the otp data is not refreshed in shadow
  * Return: 0 if no error
  */
 static int bsec_program_otp(long base, u32 val, u32 otp)
 {
 	u32 ret;
 	bool power_up = false;

 	if (bsec_read_SP_lock(base, otp))
 		pr_debug("bsec : OTP %d locked, prog will be ignore\n", otp);

 	if (readl(base + BSEC_OTP_LOCK_OFF) & (1 << BSEC_LOCK_PROGRAM))
 		pr_debug("bsec : Global lock, prog will be ignore\n");

 	/* check if safemem is power up */
 	if (!(readl(base + BSEC_OTP_STATUS_OFF) & BSEC_MODE_PWR_MASK)) {
 		ret = bsec_power_safmem(base, true);
 		if (ret)
 			return ret;

 		power_up = true;
 	}
 	/* set value in write register*/
 	writel(val, base + BSEC_OTP_WRDATA_OFF);

 	/* set BSEC_OTP_CTRL_OFF with the otp value */
 	writel(otp | BSEC_WRITE, base + BSEC_OTP_CTRL_OFF);

 	/* check otp status*/
 	ret = readl_poll_timeout(base + BSEC_OTP_STATUS_OFF,
 				 val, (val & BSEC_MODE_BUSY_MASK) == 0,
 				 BSEC_TIMEOUT_US);
 	if (ret)
 		return ret;

 	if (val & BSEC_MODE_PROGFAIL_MASK)
 		ret = -EACCES;
 	else
 		ret = bsec_check_error(base, otp);

 	if (power_up)
 		bsec_power_safmem(base, false);

 	return ret;
 }

 /* BSEC MISC driver *******************************************************/
 struct stm32mp_bsec_platdata {
 	u32 base;
 };

 static int stm32mp_bsec_read_otp(struct udevice *dev, u32 *val, u32 otp)
 {
 	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);
 	u32 tmp_data = 0;
 	int ret;

 	/* read current shadow value */
 	ret = bsec_read_shadow(plat->base, &tmp_data, otp);
 	if (ret)
 		return ret;

 	/* copy otp in shadow */
 	ret = bsec_shadow_register(plat->base, otp);
 	if (ret)
 		return ret;

 	ret = bsec_read_shadow(plat->base, val, otp);
 	if (ret)
 		return ret;

 	/* restore shadow value */
 	ret = bsec_write_shadow(plat->base, tmp_data, otp);
 	return ret;
 }

 static int stm32mp_bsec_read_shadow(struct udevice *dev, u32 *val, u32 otp)
 {
 	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

 	return bsec_read_shadow(plat->base, val, otp);
 }

 static int stm32mp_bsec_write_otp(struct udevice *dev, u32 val, u32 otp)
 {
 	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

 	return bsec_program_otp(plat->base, val, otp);
 }

 static int stm32mp_bsec_write_shadow(struct udevice *dev, u32 val, u32 otp)
 {
 	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

 	return bsec_write_shadow(plat->base, val, otp);
 }

 static int stm32mp_bsec_read(struct udevice *dev, int offset,
 			     void *buf, int size)
 {
 	int ret;
 	int i;
 	bool shadow = true;
 	int nb_otp = size / sizeof(u32);
 	int otp;

 	if (offset >= STM32_BSEC_OTP_OFFSET) {
 		offset -= STM32_BSEC_OTP_OFFSET;
 		shadow = false;
 	}
 	otp = offset / sizeof(u32);

 	if (otp < 0 || (otp + nb_otp - 1) > BSEC_OTP_MAX_VALUE) {
 		dev_err(dev, "wrong value for otp, max value : %i\n",
 			BSEC_OTP_MAX_VALUE);
 		return -EINVAL;
 	}

 	for (i = otp; i < (otp + nb_otp); i++) {
 		u32 *addr = &((u32 *)buf)[i - otp];

 		if (shadow)
 			ret = stm32mp_bsec_read_shadow(dev, addr, i);
 		else
 			ret = stm32mp_bsec_read_otp(dev, addr, i);

 		if (ret)
 			break;
 	}
 	return ret;
 }

 static int stm32mp_bsec_write(struct udevice *dev, int offset,
 			      const void *buf, int size)
 {
 	int ret = 0;
 	int i;
 	bool shadow = true;
 	int nb_otp = size / sizeof(u32);
 	int otp;

 	if (offset >= STM32_BSEC_OTP_OFFSET) {
 		offset -= STM32_BSEC_OTP_OFFSET;
 		shadow = false;
 	}
 	otp = offset / sizeof(u32);

 	if (otp < 0 || (otp + nb_otp - 1) > BSEC_OTP_MAX_VALUE) {
 		dev_err(dev, "wrong value for otp, max value : %d\n",
 			BSEC_OTP_MAX_VALUE);
 		return -EINVAL;
 	}

 	for (i = otp; i < otp + nb_otp; i++) {
 		u32 *val = &((u32 *)buf)[i - otp];

 		if (shadow)
 			ret = stm32mp_bsec_write_shadow(dev, *val, i);
 		else
 			ret = stm32mp_bsec_write_otp(dev, *val, i);
 		if (ret)
 			break;
 	}
 	return ret;
 }

 static const struct misc_ops stm32mp_bsec_ops = {
 	.read = stm32mp_bsec_read,
 	.write = stm32mp_bsec_write,
 };

 static int stm32mp_bsec_ofdata_to_platdata(struct udevice *dev)
 {
 	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

 	plat->base = (u32)dev_read_addr_ptr(dev);

 	return 0;
 }

 static const struct udevice_id stm32mp_bsec_ids[] = {
 	{ .compatible = "st,stm32mp-bsec" },
 	{}
 };

 U_BOOT_DRIVER(stm32mp_bsec) = {
 	.name = "stm32mp_bsec",
 	.id = UCLASS_MISC,
 	.of_match = stm32mp_bsec_ids,
 	.ofdata_to_platdata = stm32mp_bsec_ofdata_to_platdata,
 	.platdata_auto_alloc_size = sizeof(struct stm32mp_bsec_platdata),
 	.ops = &stm32mp_bsec_ops,
 };

 /* bsec IP is not present in device tee, manage IP address by platdata */
 static struct stm32mp_bsec_platdata stm32_bsec_platdata = {
 	.base = STM32_BSEC_BASE,
 };

 U_BOOT_DEVICE(stm32mp_bsec) = {
 	.name = "stm32mp_bsec",
 	.platdata = &stm32_bsec_platdata,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
	*/

	#include <common.h>
	#include <dm.h>
	#include <misc.h>
	#include <asm/io.h>
	#include <linux/iopoll.h>

	#define BSEC_OTP_MAX_VALUE 95

	#define BSEC_TIMEOUT_US 10000

	/* BSEC REGISTER OFFSET (base relative) */
	#define BSEC_OTP_CONF_OFF 0x000
	#define BSEC_OTP_CTRL_OFF 0x004
	#define BSEC_OTP_WRDATA_OFF 0x008
	#define BSEC_OTP_STATUS_OFF 0x00C
	#define BSEC_OTP_LOCK_OFF 0x010
	#define BSEC_DISTURBED_OFF 0x01C
	#define BSEC_ERROR_OFF 0x034
	#define BSEC_SPLOCK_OFF 0x064 /* Program safmem sticky lock */
	#define BSEC_SWLOCK_OFF 0x07C /* write in OTP sticky lock */
	#define BSEC_SRLOCK_OFF 0x094 /* shadowing sticky lock */
	#define BSEC_OTP_DATA_OFF 0x200

	/* BSEC_CONFIGURATION Register MASK */
	#define BSEC_CONF_POWER_UP 0x001

	/* BSEC_CONTROL Register */
	#define BSEC_READ 0x000
	#define BSEC_WRITE 0x100

	/* LOCK Register */
	#define OTP_LOCK_MASK 0x1F
	#define OTP_LOCK_BANK_SHIFT 0x05
	#define OTP_LOCK_BIT_MASK 0x01

	/* STATUS Register */
	#define BSEC_MODE_BUSY_MASK 0x08
	#define BSEC_MODE_PROGFAIL_MASK 0x10
	#define BSEC_MODE_PWR_MASK 0x20

	/*
	* OTP Lock services definition
	* Value must corresponding to the bit number in the register
	*/
	#define BSEC_LOCK_PROGRAM 0x04

	/**
	* bsec_check_error() - Check status of one otp
	* @base: base address of bsec IP
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: 0 if no error, -EAGAIN or -ENOTSUPP
	*/
	static u32 bsec_check_error(u32 base, u32 otp)
	{
	u32 bit;
	u32 bank;

	bit = 1 << (otp & OTP_LOCK_MASK);
	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);

	if (readl(base + BSEC_DISTURBED_OFF + bank) & bit)
	return -EAGAIN;
	else if (readl(base + BSEC_ERROR_OFF + bank) & bit)
	return -ENOTSUPP;

	return 0;
	}

	/**
	* bsec_lock() - manage lock for each type SR/SP/SW
	* @address: address of bsec IP register
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: true if locked else false
	*/
	static bool bsec_read_lock(u32 address, u32 otp)
	{
	u32 bit;
	u32 bank;

	bit = 1 << (otp & OTP_LOCK_MASK);
	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);

	return !!(readl(address + bank) & bit);
	}

	/**
	* bsec_read_SR_lock() - read SR lock (Shadowing)
	* @base: base address of bsec IP
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: true if locked else false
	*/
	static bool bsec_read_SR_lock(u32 base, u32 otp)
	{
	return bsec_read_lock(base + BSEC_SRLOCK_OFF, otp);
	}

	/**
	* bsec_read_SP_lock() - read SP lock (program Lock)
	* @base: base address of bsec IP
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: true if locked else false
	*/
	static bool bsec_read_SP_lock(u32 base, u32 otp)
	{
	return bsec_read_lock(base + BSEC_SPLOCK_OFF, otp);
	}

	/**
	* bsec_SW_lock() - manage SW lock (Write in Shadow)
	* @base: base address of bsec IP
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: true if locked else false
	*/
	static bool bsec_read_SW_lock(u32 base, u32 otp)
	{
	return bsec_read_lock(base + BSEC_SWLOCK_OFF, otp);
	}

	/**
	* bsec_power_safmem() - Activate or deactivate safmem power
	* @base: base address of bsec IP
	* @power: true to power up , false to power down
	* Return: 0 if succeed
	*/
	static int bsec_power_safmem(u32 base, bool power)
	{
	u32 val;
	u32 mask;

	if (power) {
	setbits_le32(base + BSEC_OTP_CONF_OFF, BSEC_CONF_POWER_UP);
	mask = BSEC_MODE_PWR_MASK;
	} else {
	clrbits_le32(base + BSEC_OTP_CONF_OFF, BSEC_CONF_POWER_UP);
	mask = 0;
	}

	/* waiting loop */
	return readl_poll_timeout(base + BSEC_OTP_STATUS_OFF,
	val, (val & BSEC_MODE_PWR_MASK) == mask,
	BSEC_TIMEOUT_US);
	}

	/**
	* bsec_shadow_register() - copy safmen otp to bsec data
	* @base: base address of bsec IP
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: 0 if no error
	*/
	static int bsec_shadow_register(u32 base, u32 otp)
	{
	u32 val;
	int ret;
	bool power_up = false;

	/* check if shadowing of otp is locked */
	if (bsec_read_SR_lock(base, otp))
	pr_debug("bsec : OTP %d is locked and refreshed with 0\n", otp);

	/* check if safemem is power up */
	val = readl(base + BSEC_OTP_STATUS_OFF);
	if (!(val & BSEC_MODE_PWR_MASK)) {
	ret = bsec_power_safmem(base, true);
	if (ret)
	return ret;
	power_up = 1;
	}
	/* set BSEC_OTP_CTRL_OFF with the otp value*/
	writel(otp \| BSEC_READ, base + BSEC_OTP_CTRL_OFF);

	/* check otp status*/
	ret = readl_poll_timeout(base + BSEC_OTP_STATUS_OFF,
	val, (val & BSEC_MODE_BUSY_MASK) == 0,
	BSEC_TIMEOUT_US);
	if (ret)
	return ret;

	ret = bsec_check_error(base, otp);

	if (power_up)
	bsec_power_safmem(base, false);

	return ret;
	}

	/**
	* bsec_read_shadow() - read an otp data value from shadow
	* @base: base address of bsec IP
	* @val: read value
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: 0 if no error
	*/
	static int bsec_read_shadow(u32 base, u32 *val, u32 otp)
	{
	val = readl(base + BSEC_OTP_DATA_OFF + otp sizeof(u32));

	return bsec_check_error(base, otp);
	}

	/**
	* bsec_write_shadow() - write value in BSEC data register in shadow
	* @base: base address of bsec IP
	* @val: value to write
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* Return: 0 if no error
	*/
	static int bsec_write_shadow(u32 base, u32 val, u32 otp)
	{
	/* check if programming of otp is locked */
	if (bsec_read_SW_lock(base, otp))
	pr_debug("bsec : OTP %d is lock, write will be ignore\n", otp);

	writel(val, base + BSEC_OTP_DATA_OFF + otp * sizeof(u32));

	return bsec_check_error(base, otp);
	}

	/**
	* bsec_program_otp() - program a bit in SAFMEM
	* @base: base address of bsec IP
	* @val: value to program
	* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
	* after the function the otp data is not refreshed in shadow
	* Return: 0 if no error
	*/
	static int bsec_program_otp(long base, u32 val, u32 otp)
	{
	u32 ret;
	bool power_up = false;

	if (bsec_read_SP_lock(base, otp))
	pr_debug("bsec : OTP %d locked, prog will be ignore\n", otp);

	if (readl(base + BSEC_OTP_LOCK_OFF) & (1 << BSEC_LOCK_PROGRAM))
	pr_debug("bsec : Global lock, prog will be ignore\n");

	/* check if safemem is power up */
	if (!(readl(base + BSEC_OTP_STATUS_OFF) & BSEC_MODE_PWR_MASK)) {
	ret = bsec_power_safmem(base, true);
	if (ret)
	return ret;

	power_up = true;
	}
	/* set value in write register*/
	writel(val, base + BSEC_OTP_WRDATA_OFF);

	/* set BSEC_OTP_CTRL_OFF with the otp value */
	writel(otp \| BSEC_WRITE, base + BSEC_OTP_CTRL_OFF);

	/* check otp status*/
	ret = readl_poll_timeout(base + BSEC_OTP_STATUS_OFF,
	val, (val & BSEC_MODE_BUSY_MASK) == 0,
	BSEC_TIMEOUT_US);
	if (ret)
	return ret;

	if (val & BSEC_MODE_PROGFAIL_MASK)
	ret = -EACCES;
	else
	ret = bsec_check_error(base, otp);

	if (power_up)
	bsec_power_safmem(base, false);

	return ret;
	}

	/* BSEC MISC driver *******************************************************/
	struct stm32mp_bsec_platdata {
	u32 base;
	};

	static int stm32mp_bsec_read_otp(struct udevice dev, u32 val, u32 otp)
	{
	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);
	u32 tmp_data = 0;
	int ret;

	/* read current shadow value */
	ret = bsec_read_shadow(plat->base, &tmp_data, otp);
	if (ret)
	return ret;

	/* copy otp in shadow */
	ret = bsec_shadow_register(plat->base, otp);
	if (ret)
	return ret;

	ret = bsec_read_shadow(plat->base, val, otp);
	if (ret)
	return ret;

	/* restore shadow value */
	ret = bsec_write_shadow(plat->base, tmp_data, otp);
	return ret;
	}

	static int stm32mp_bsec_read_shadow(struct udevice dev, u32 val, u32 otp)
	{
	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

	return bsec_read_shadow(plat->base, val, otp);
	}

	static int stm32mp_bsec_write_otp(struct udevice *dev, u32 val, u32 otp)
	{
	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

	return bsec_program_otp(plat->base, val, otp);
	}

	static int stm32mp_bsec_write_shadow(struct udevice *dev, u32 val, u32 otp)
	{
	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

	return bsec_write_shadow(plat->base, val, otp);
	}

	static int stm32mp_bsec_read(struct udevice *dev, int offset,
	void *buf, int size)
	{
	int ret;
	int i;
	bool shadow = true;
	int nb_otp = size / sizeof(u32);
	int otp;

	if (offset >= STM32_BSEC_OTP_OFFSET) {
	offset -= STM32_BSEC_OTP_OFFSET;
	shadow = false;
	}
	otp = offset / sizeof(u32);

	if (otp < 0 \|\| (otp + nb_otp - 1) > BSEC_OTP_MAX_VALUE) {
	dev_err(dev, "wrong value for otp, max value : %i\n",
	BSEC_OTP_MAX_VALUE);
	return -EINVAL;
	}

	for (i = otp; i < (otp + nb_otp); i++) {
	u32 addr = &((u32 )buf)[i - otp];

	if (shadow)
	ret = stm32mp_bsec_read_shadow(dev, addr, i);
	else
	ret = stm32mp_bsec_read_otp(dev, addr, i);

	if (ret)
	break;
	}
	return ret;
	}

	static int stm32mp_bsec_write(struct udevice *dev, int offset,
	const void *buf, int size)
	{
	int ret = 0;
	int i;
	bool shadow = true;
	int nb_otp = size / sizeof(u32);
	int otp;

	if (offset >= STM32_BSEC_OTP_OFFSET) {
	offset -= STM32_BSEC_OTP_OFFSET;
	shadow = false;
	}
	otp = offset / sizeof(u32);

	if (otp < 0 \|\| (otp + nb_otp - 1) > BSEC_OTP_MAX_VALUE) {
	dev_err(dev, "wrong value for otp, max value : %d\n",
	BSEC_OTP_MAX_VALUE);
	return -EINVAL;
	}

	for (i = otp; i < otp + nb_otp; i++) {
	u32 val = &((u32 )buf)[i - otp];

	if (shadow)
	ret = stm32mp_bsec_write_shadow(dev, *val, i);
	else
	ret = stm32mp_bsec_write_otp(dev, *val, i);
	if (ret)
	break;
	}
	return ret;
	}

	static const struct misc_ops stm32mp_bsec_ops = {
	.read = stm32mp_bsec_read,
	.write = stm32mp_bsec_write,
	};

	static int stm32mp_bsec_ofdata_to_platdata(struct udevice *dev)
	{
	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);

	plat->base = (u32)dev_read_addr_ptr(dev);

	return 0;
	}

	static const struct udevice_id stm32mp_bsec_ids[] = {
	{ .compatible = "st,stm32mp-bsec" },
	{}
	};

	U_BOOT_DRIVER(stm32mp_bsec) = {
	.name = "stm32mp_bsec",
	.id = UCLASS_MISC,
	.of_match = stm32mp_bsec_ids,
	.ofdata_to_platdata = stm32mp_bsec_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct stm32mp_bsec_platdata),
	.ops = &stm32mp_bsec_ops,
	};

	/* bsec IP is not present in device tee, manage IP address by platdata */
	static struct stm32mp_bsec_platdata stm32_bsec_platdata = {
	.base = STM32_BSEC_BASE,
	};

	U_BOOT_DEVICE(stm32mp_bsec) = {
	.name = "stm32mp_bsec",
	.platdata = &stm32_bsec_platdata,
	};