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u-boot/arch/arm/mach-stm32mp/bsec.c
Patrick Delaunay 19f589923a stm32mp1: add bsec driver 
Add a MISC driver with read and write access to BSEC IP
(Boot and Security and OTP control)
- offset 0: shadowed values
- offset 0x80000000: OTP fuse box values (SAFMEM)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
2018-05-26 18:19:18 -04:00

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// 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,
.flags = DM_FLAG_PRE_RELOC,
};
/* 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,
};
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