[PATCH 04/10] arm: stm32mp: bsec: add permanent lock support in bsec driver

Patrice CHOTARD patrice.chotard at st.com
Wed Mar 18 11:07:06 CET 2020


On 2/12/20 7:37 PM, Patrick Delaunay wrote:
> Add BSEC lock access (read / write) at 0xC0000000 offset of misc driver.
> The write access only available for Trusted boot mode, based on new
> SMC STM32_SMC_WRLOCK_OTP.
>
> With the fuse command, the permanent lock status is accessed with
> 0x10000000 offset (0xC0000000 - 0x8000000 for OTP sense/program
> divided by u32 size), for example:
>
> Read lock status of fuse 57 (0x39)
>
>   STM32MP> fuse sense 0 0x10000039 1
>
>   Sensing bank 0:
>
>   Word 0x10000039: 00000000
>
> Set permanent lock of fuse 57 (0x39)
>
>   STM32MP> fuse prog 0 0x10000039 1
>
>   Sensing bank 0:
>
>   Word 0x10000039: 00000000
>
> WARNING: the OTP lock is updated only after reboot
>
> WARING: Programming lock or fuses is an irreversible operation!
>         This may brick your system.
>
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
> ---
>
>  arch/arm/mach-stm32mp/bsec.c                  | 88 +++++++++++++------
>  arch/arm/mach-stm32mp/cpu.c                   |  6 --
>  arch/arm/mach-stm32mp/include/mach/stm32.h    |  9 +-
>  .../mach-stm32mp/include/mach/stm32mp1_smc.h  |  1 +
>  doc/board/st/stm32mp1.rst                     | 34 ++++---
>  5 files changed, 95 insertions(+), 43 deletions(-)
>
> diff --git a/arch/arm/mach-stm32mp/bsec.c b/arch/arm/mach-stm32mp/bsec.c
> index 1d904caae1..3b923f088e 100644
> --- a/arch/arm/mach-stm32mp/bsec.c
> +++ b/arch/arm/mach-stm32mp/bsec.c
> @@ -12,8 +12,6 @@
>  #include <linux/iopoll.h>
>  
>  #define BSEC_OTP_MAX_VALUE		95
> -
> -#ifndef CONFIG_STM32MP1_TRUSTED
>  #define BSEC_TIMEOUT_US			10000
>  
>  /* BSEC REGISTER OFFSET (base relative) */
> @@ -24,9 +22,10 @@
>  #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_WRLOCK_OFF			0x04C /* OTP write permananet lock */
> +#define BSEC_SPLOCK_OFF			0x064 /* OTP write sticky lock */
> +#define BSEC_SWLOCK_OFF			0x07C /* shadow write sticky lock */
> +#define BSEC_SRLOCK_OFF			0x094 /* shadow read sticky lock */
>  #define BSEC_OTP_DATA_OFF		0x200
>  
>  /* BSEC_CONFIGURATION Register MASK */
> @@ -53,12 +52,12 @@
>  #define BSEC_LOCK_PROGRAM		0x04
>  
>  /**
> - * bsec_check_error() - Check status of one otp
> - * @base: base address of bsec IP
> + * 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: 0 if no error, -EAGAIN or -ENOTSUPP
> + * Return: true if locked else false
>   */
> -static u32 bsec_check_error(u32 base, u32 otp)
> +static bool bsec_read_lock(u32 address, u32 otp)
>  {
>  	u32 bit;
>  	u32 bank;
> @@ -66,21 +65,17 @@ static u32 bsec_check_error(u32 base, u32 otp)
>  	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;
> +	return !!(readl(address + bank) & bit);
>  }
>  
> +#ifndef CONFIG_STM32MP1_TRUSTED
>  /**
> - * bsec_lock() - manage lock for each type SR/SP/SW
> - * @address: address of bsec IP register
> + * bsec_check_error() - Check status of one otp
> + * @base: base address of bsec IP
>   * @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
> - * Return: true if locked else false
> + * Return: 0 if no error, -EAGAIN or -ENOTSUPP
>   */
> -static bool bsec_read_lock(u32 address, u32 otp)
> +static u32 bsec_check_error(u32 base, u32 otp)
>  {
>  	u32 bit;
>  	u32 bank;
> @@ -88,7 +83,12 @@ static bool bsec_read_lock(u32 address, u32 otp)
>  	bit = 1 << (otp & OTP_LOCK_MASK);
>  	bank = ((otp >> OTP_LOCK_BANK_SHIFT) & OTP_LOCK_MASK) * sizeof(u32);
>  
> -	return !!(readl(address + bank) & bit);
> +	if (readl(base + BSEC_DISTURBED_OFF + bank) & bit)
> +		return -EAGAIN;
> +	else if (readl(base + BSEC_ERROR_OFF + bank) & bit)
> +		return -ENOTSUPP;
> +
> +	return 0;
>  }
>  
>  /**
> @@ -324,6 +324,16 @@ static int stm32mp_bsec_read_shadow(struct udevice *dev, u32 *val, u32 otp)
>  #endif
>  }
>  
> +static int stm32mp_bsec_read_lock(struct udevice *dev, u32 *val, u32 otp)
> +{
> +	struct stm32mp_bsec_platdata *plat = dev_get_platdata(dev);
> +
> +	/* return OTP permanent write lock status */
> +	*val = bsec_read_lock(plat->base + BSEC_WRLOCK_OFF, otp);
> +
> +	return 0;
> +}
> +
>  static int stm32mp_bsec_write_otp(struct udevice *dev, u32 val, u32 otp)
>  {
>  #ifdef CONFIG_STM32MP1_TRUSTED
> @@ -350,17 +360,36 @@ static int stm32mp_bsec_write_shadow(struct udevice *dev, u32 val, u32 otp)
>  #endif
>  }
>  
> +static int stm32mp_bsec_write_lock(struct udevice *dev, u32 val, u32 otp)
> +{
> +#ifdef CONFIG_STM32MP1_TRUSTED
> +	if (val == 1)
> +		return stm32_smc_exec(STM32_SMC_BSEC,
> +				      STM32_SMC_WRLOCK_OTP,
> +				      otp, 0);
> +	if (val == 0)
> +		return 0; /* nothing to do */
> +
> +	return -EINVAL;
> +#else
> +	return -ENOTSUPP;
> +#endif
> +}
> +
>  static int stm32mp_bsec_read(struct udevice *dev, int offset,
>  			     void *buf, int size)
>  {
>  	int ret;
>  	int i;
> -	bool shadow = true;
> +	bool shadow = true, lock = false;
>  	int nb_otp = size / sizeof(u32);
>  	int otp;
>  	unsigned int offs = offset;
>  
> -	if (offs >= STM32_BSEC_OTP_OFFSET) {
> +	if (offs >= STM32_BSEC_LOCK_OFFSET) {
> +		offs -= STM32_BSEC_LOCK_OFFSET;
> +		lock = true;
> +	} else if (offs >= STM32_BSEC_OTP_OFFSET) {
>  		offs -= STM32_BSEC_OTP_OFFSET;
>  		shadow = false;
>  	}
> @@ -373,7 +402,9 @@ static int stm32mp_bsec_read(struct udevice *dev, int offset,
>  	for (i = otp; i < (otp + nb_otp) && i <= BSEC_OTP_MAX_VALUE; i++) {
>  		u32 *addr = &((u32 *)buf)[i - otp];
>  
> -		if (shadow)
> +		if (lock)
> +			ret = stm32mp_bsec_read_lock(dev, addr, i);
> +		else if (shadow)
>  			ret = stm32mp_bsec_read_shadow(dev, addr, i);
>  		else
>  			ret = stm32mp_bsec_read_otp(dev, addr, i);
> @@ -392,12 +423,15 @@ static int stm32mp_bsec_write(struct udevice *dev, int offset,
>  {
>  	int ret = 0;
>  	int i;
> -	bool shadow = true;
> +	bool shadow = true, lock = false;
>  	int nb_otp = size / sizeof(u32);
>  	int otp;
>  	unsigned int offs = offset;
>  
> -	if (offs >= STM32_BSEC_OTP_OFFSET) {
> +	if (offs >= STM32_BSEC_LOCK_OFFSET) {
> +		offs -= STM32_BSEC_LOCK_OFFSET;
> +		lock = true;
> +	} else if (offs >= STM32_BSEC_OTP_OFFSET) {
>  		offs -= STM32_BSEC_OTP_OFFSET;
>  		shadow = false;
>  	}
> @@ -410,7 +444,9 @@ static int stm32mp_bsec_write(struct udevice *dev, int offset,
>  	for (i = otp; i < otp + nb_otp && i <= BSEC_OTP_MAX_VALUE; i++) {
>  		u32 *val = &((u32 *)buf)[i - otp];
>  
> -		if (shadow)
> +		if (lock)
> +			ret = stm32mp_bsec_write_lock(dev, *val, i);
> +		else if (shadow)
>  			ret = stm32mp_bsec_write_shadow(dev, *val, i);
>  		else
>  			ret = stm32mp_bsec_write_otp(dev, *val, i);
> diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c
> index ea0bd94605..5febed735c 100644
> --- a/arch/arm/mach-stm32mp/cpu.c
> +++ b/arch/arm/mach-stm32mp/cpu.c
> @@ -61,12 +61,6 @@
>  #define BOOTROM_INSTANCE_MASK	 GENMASK(31, 16)
>  #define BOOTROM_INSTANCE_SHIFT	16
>  
> -/* BSEC OTP index */
> -#define BSEC_OTP_RPN	1
> -#define BSEC_OTP_SERIAL	13
> -#define BSEC_OTP_PKG	16
> -#define BSEC_OTP_MAC	57
> -
>  /* Device Part Number (RPN) = OTP_DATA1 lower 8 bits */
>  #define RPN_SHIFT	0
>  #define RPN_MASK	GENMASK(7, 0)
> diff --git a/arch/arm/mach-stm32mp/include/mach/stm32.h b/arch/arm/mach-stm32mp/include/mach/stm32.h
> index f0636005e5..6daf9f7121 100644
> --- a/arch/arm/mach-stm32mp/include/mach/stm32.h
> +++ b/arch/arm/mach-stm32mp/include/mach/stm32.h
> @@ -119,7 +119,14 @@ enum forced_boot_mode {
>  #define STM32_BSEC_SHADOW(id)		(STM32_BSEC_SHADOW_OFFSET + (id) * 4)
>  #define STM32_BSEC_OTP_OFFSET		0x80000000
>  #define STM32_BSEC_OTP(id)		(STM32_BSEC_OTP_OFFSET + (id) * 4)
> -
> +#define STM32_BSEC_LOCK_OFFSET		0xC0000000
> +#define STM32_BSEC_LOCK(id)		(STM32_BSEC_LOCK_OFFSET + (id) * 4)
> +
> +/* BSEC OTP index */
> +#define BSEC_OTP_RPN	1
> +#define BSEC_OTP_SERIAL	13
> +#define BSEC_OTP_PKG	16
> +#define BSEC_OTP_MAC	57
>  #define BSEC_OTP_BOARD	59
>  
>  #endif /* __ASSEMBLY__*/
> diff --git a/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h b/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h
> index 8130546b27..7b9167c356 100644
> --- a/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h
> +++ b/arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h
> @@ -27,6 +27,7 @@
>  #define STM32_SMC_READ_OTP		0x04
>  #define STM32_SMC_READ_ALL		0x05
>  #define STM32_SMC_WRITE_ALL		0x06
> +#define STM32_SMC_WRLOCK_OTP		0x07
>  
>  /* SMC error codes */
>  #define STM32_SMC_OK			0x0
> diff --git a/doc/board/st/stm32mp1.rst b/doc/board/st/stm32mp1.rst
> index 131f4902a3..274f8d9710 100644
> --- a/doc/board/st/stm32mp1.rst
> +++ b/doc/board/st/stm32mp1.rst
> @@ -402,20 +402,26 @@ For STMicroelectonics board, it is retrieved in STM32MP15x OTP :
>   - OTP_58[15:0] = MAC_ADDR[47:32]
>  
>  To program a MAC address on virgin OTP words above, you can use the fuse command
> -on bank 0 to access to internal OTP:
> +on bank 0 to access to internal OTP and lock them:
>  
>  Prerequisite: check if a MAC address isn't yet programmed in OTP
>  
> -1) check OTP: their value must be equal to 0
> +1) check OTP: their value must be equal to 0::
>  
> -   STM32MP> fuse sense 0 57 2
> -   Sensing bank 0:
> -   Word 0x00000039: 00000000 00000000
> +    STM32MP> fuse sense 0 57 2
> +    Sensing bank 0:
> +    Word 0x00000039: 00000000 00000000
> +
> +2) check environment variable::
> +
> +    STM32MP> env print ethaddr
> +    ## Error: "ethaddr" not defined
>  
> -2) check environment variable
> +3) check lock status of fuse 57 & 58 (at 0x39, 0=unlocked, 1=locked)::
>  
> -   STM32MP> env print ethaddr
> -   ## Error: "ethaddr" not defined
> +    STM32MP> fuse sense 0 0x10000039 2
> +    Sensing bank 0:
> +       Word 0x10000039: 00000000 00000000
>  
>  Example to set mac address "12:34:56:78:9a:bc"
>  
> @@ -429,11 +435,19 @@ Example to set mac address "12:34:56:78:9a:bc"
>      Sensing bank 0:
>      Word 0x00000039: 78563412 0000bc9a
>  
> -3) next REBOOT, in the trace::
> +3) Lock OTP::
> +
> +    STM32MP> fuse prog 0 0x10000039 1 1
> +
> +    STM32MP> fuse sense 0 0x10000039 2
> +    Sensing bank 0:
> +       Word 0x10000039: 00000001 00000001
> +
> +4) next REBOOT, in the trace::
>
> Acked-by: Patrice Chotard <patrice.chotard at st.com>
>
> Thanks
>
> Patrice
>
>  
>      ### Setting environment from OTP MAC address = "12:34:56:78:9a:bc"
>  
> -4) check env update::
> +5) check env update::
>  
>      STM32MP> env print ethaddr
>      ethaddr=12:34:56:78:9a:bc


Acked-by: Patrice Chotard <patrice.chotard at st.com>

Thanks

Patrice


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