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stm32mp: bsec: add permanent lock write support

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Add support of the permanent lock support in U-Boot proper
when BSEC is not managed by secure monitor (TF-A SP_MIN or OP-TEE).

This patch avoid issue with stm32key command and fuse command
on basic boot for this missing feature of U-Boot BSEC driver.

Reported-by: Johann Neuhauser <jneuhauser@dh-electronics.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Tested-by: Johann Neuhauser <jneuhauser@dh-electronics.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Patrick Delaunay 2022-02-15 16:08:50 +01:00 • committed by Patrice Chotard
parent 7ce4f1fad2
commit 0c20f53b3f
1 changed files with 84 additions and 6 deletions
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90
arch/arm/mach-stm32mp/bsec.c
View file

@ -18,6 +18,7 @@
#include <linux/iopoll.h>
#define BSEC_OTP_MAX_VALUE 95
#define BSEC_OTP_UPPER_START 32
#define BSEC_TIMEOUT_US 10000
/* BSEC REGISTER OFFSET (base relative) */
@ -41,6 +42,7 @@
/* BSEC_CONTROL Register */
#define BSEC_READ 0x000
#define BSEC_WRITE 0x100
#define BSEC_LOCK 0x200
/* LOCK Register */
#define OTP_LOCK_MASK 0x1F
@ -61,6 +63,11 @@
*/
#define BSEC_LOCK_PROGRAM 0x04
/*
* OTP status: bit 0 permanent lock
*/
#define BSEC_LOCK_PERM BIT(0)
/**
* bsec_lock() - manage lock for each type SR/SP/SW
* @address: address of bsec IP register
@ -284,6 +291,65 @@ static int bsec_program_otp(struct udevice *dev, long base, u32 val, u32 otp)
return ret;
}
/**
* bsec_permanent_lock_otp() - permanent lock of OTP in SAFMEM
* @dev: bsec IP device
* @base: base address of bsec IP
* @otp: otp number (0 - BSEC_OTP_MAX_VALUE)
* Return: 0 if no error
*/
static int bsec_permanent_lock_otp(struct udevice *dev, long base, uint32_t otp)
{
int ret;
bool power_up = false;
u32 val, addr;
/* 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;
}
/*
* low OTPs = 2 bits word for low OTPs, 1 bits per word for upper OTP
* and only 16 bits used in WRDATA
*/
if (otp < BSEC_OTP_UPPER_START) {
addr = otp / 8;
val = 0x03 << ((otp * 2) & 0xF);
} else {
addr = BSEC_OTP_UPPER_START / 8 +
((otp - BSEC_OTP_UPPER_START) / 16);
val = 0x01 << (otp & 0xF);
}
/* set value in write register*/
writel(val, base + BSEC_OTP_WRDATA_OFF);
/* set BSEC_OTP_CTRL_OFF with the otp addr and lock request*/
writel(addr | BSEC_WRITE | BSEC_LOCK, 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_plat {
u32 base;
@ -339,9 +405,14 @@ static int stm32mp_bsec_read_shadow(struct udevice *dev, u32 *val, u32 otp)
static int stm32mp_bsec_read_lock(struct udevice *dev, u32 *val, u32 otp)
{
struct stm32mp_bsec_plat *plat = dev_get_plat(dev);
u32 wrlock;
/* return OTP permanent write lock status */
*val = bsec_read_lock(plat->base + BSEC_WRLOCK_OFF, otp);
wrlock = bsec_read_lock(plat->base + BSEC_WRLOCK_OFF, otp);
*val = 0;
if (wrlock)
*val = BSEC_LOCK_PERM;
return 0;
}
@ -377,15 +448,22 @@ static int stm32mp_bsec_write_shadow(struct udevice *dev, u32 val, u32 otp)
static int stm32mp_bsec_write_lock(struct udevice *dev, u32 val, u32 otp)
{
if (!IS_ENABLED(CONFIG_ARM_SMCCC) || IS_ENABLED(CONFIG_SPL_BUILD))
return -ENOTSUPP;
struct stm32mp_bsec_plat *plat;
if (val == 1)
/* only permanent write lock is supported in U-Boot */
if (!(val & BSEC_LOCK_PERM)) {
dev_dbg(dev, "lock option without BSEC_LOCK_PERM: %x\n", val);
return 0; /* nothing to do */
}
if (IS_ENABLED(CONFIG_ARM_SMCCC) && !IS_ENABLED(CONFIG_SPL_BUILD))
return stm32_smc_exec(STM32_SMC_BSEC,
STM32_SMC_WRLOCK_OTP,
otp, 0);
if (val == 0)
return 0; /* nothing to do */
plat = dev_get_plat(dev);
return bsec_permanent_lock_otp(dev, plat->base, otp);
return -EINVAL;
}