tf-a/tf-a-stm32mp-2.2.r1/plat/st/stm32mp1/stm32mp1_shared_resources.c

744 lines
17 KiB
C

/*
* Copyright (c) 2017-2020, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <platform_def.h>
#include <arch.h>
#include <common/debug.h>
#include <drivers/st/stm32_gpio.h>
#include <stm32mp_dt.h>
#include <stm32mp_shres_helpers.h>
#include <stm32mp1_shared_resources.h>
static bool registering_locked;
static int8_t gpioz_nbpin = -1;
/*
* Shared peripherals and resources.
* Defines resource that may be non secure, secure or shared.
* May be a device, a bus, a clock, a memory.
* Shared peripherals and resources registration
*
* Each resource assignation is stored in a table. The state defaults
* to SHRES_UNREGISTERED if the resource is not explicitly assigned.
*
* Each IO of the GPIOZ IO can be secure or non-secure.
*/
#define SHRES_NON_SECURE 2
#define SHRES_SECURE 1
#define SHRES_UNREGISTERED 0
static uint8_t shres_state[STM32MP1_SHRES_COUNT];
static const char *shres2str_id_tbl[STM32MP1_SHRES_COUNT] = {
[STM32MP1_SHRES_GPIOZ(0)] = "GPIOZ0",
[STM32MP1_SHRES_GPIOZ(1)] = "GPIOZ1",
[STM32MP1_SHRES_GPIOZ(2)] = "GPIOZ2",
[STM32MP1_SHRES_GPIOZ(3)] = "GPIOZ3",
[STM32MP1_SHRES_GPIOZ(4)] = "GPIOZ4",
[STM32MP1_SHRES_GPIOZ(5)] = "GPIOZ5",
[STM32MP1_SHRES_GPIOZ(6)] = "GPIOZ6",
[STM32MP1_SHRES_GPIOZ(7)] = "GPIOZ7",
[STM32MP1_SHRES_IWDG1] = "IWDG1",
[STM32MP1_SHRES_USART1] = "USART1",
[STM32MP1_SHRES_SPI6] = "SPI6",
[STM32MP1_SHRES_I2C4] = "I2C4",
[STM32MP1_SHRES_RNG1] = "RNG1",
[STM32MP1_SHRES_HASH1] = "HASH1",
[STM32MP1_SHRES_CRYP1] = "CRYP1",
[STM32MP1_SHRES_I2C6] = "I2C6",
[STM32MP1_SHRES_RTC] = "RTC",
[STM32MP1_SHRES_MCU] = "MCU",
[STM32MP1_SHRES_MDMA] = "MDMA",
[STM32MP1_SHRES_PLL3] = "PLL3",
};
static const char *shres2str_id(unsigned int id)
{
return shres2str_id_tbl[id];
}
static const char *shres2str_state_tbl[4] = {
[SHRES_UNREGISTERED] = "unregistered",
[SHRES_NON_SECURE] = "non-secure",
[SHRES_SECURE] = "secure",
};
static const char *shres2str_state(unsigned int id)
{
return shres2str_state_tbl[id];
}
struct shres2decprot {
unsigned int shres_id;
unsigned int decprot_id;
const char *decprot_str;
};
#define SHRES2DECPROT(shres, decprot, str) { \
.shres_id = shres, \
.decprot_id = decprot, \
.decprot_str = str, \
}
#define SHRES_INVALID ~0U
static const struct shres2decprot shres2decprot_tbl[] = {
SHRES2DECPROT(STM32MP1_SHRES_IWDG1, STM32MP1_ETZPC_IWDG1_ID, "IWDG1"),
SHRES2DECPROT(STM32MP1_SHRES_USART1, STM32MP1_ETZPC_USART1_ID, "UART1"),
SHRES2DECPROT(STM32MP1_SHRES_SPI6, STM32MP1_ETZPC_SPI6_ID, "SPI6"),
SHRES2DECPROT(STM32MP1_SHRES_I2C4, STM32MP1_ETZPC_I2C4_ID, "I2C4"),
SHRES2DECPROT(STM32MP1_SHRES_RNG1, STM32MP1_ETZPC_RNG1_ID, "RNG1"),
SHRES2DECPROT(STM32MP1_SHRES_HASH1, STM32MP1_ETZPC_HASH1_ID, "HASH1"),
SHRES2DECPROT(STM32MP1_SHRES_CRYP1, STM32MP1_ETZPC_CRYP1_ID, "CRYP1"),
SHRES2DECPROT(STM32MP1_SHRES_I2C6, STM32MP1_ETZPC_I2C6_ID, "I2C6"),
/* Below are specific IDs without a 1-to-1 mapping to SHRES IDs */
SHRES2DECPROT(SHRES_INVALID, STM32MP1_ETZPC_STGENC_ID, "STGEN"),
SHRES2DECPROT(SHRES_INVALID, STM32MP1_ETZPC_BKPSRAM_ID, "BKPSRAM"),
SHRES2DECPROT(SHRES_INVALID, STM32MP1_ETZPC_DDRCTRL_ID, "DDRCTRL"),
SHRES2DECPROT(SHRES_INVALID, STM32MP1_ETZPC_DDRPHYC_ID, "DDRPHY"),
};
static unsigned int decprot2shres(unsigned int decprot_id)
{
uint32_t i;
for (i = 0; i < ARRAY_SIZE(shres2decprot_tbl); i++) {
if (shres2decprot_tbl[i].decprot_id == decprot_id) {
return shres2decprot_tbl[i].shres_id;
}
}
VERBOSE("No shared resource %u", decprot_id);
return SHRES_INVALID;
}
static const char *decprot2str(unsigned int decprot_id)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(shres2decprot_tbl); i++) {
if (shres2decprot_tbl[i].decprot_id == decprot_id) {
return shres2decprot_tbl[i].decprot_str;
}
}
ERROR("Invalid ID %u", decprot_id);
panic();
}
static unsigned int get_gpioz_nbpin(void)
{
if (gpioz_nbpin < 0) {
gpioz_nbpin = (int8_t)fdt_get_gpioz_nbpins_from_dt();
assert((gpioz_nbpin == 0) ||
(gpioz_nbpin == STM32MP_GPIOZ_PIN_MAX_COUNT));
}
return (unsigned int)gpioz_nbpin;
}
static void register_periph(unsigned int id, unsigned int state)
{
assert((id < STM32MP1_SHRES_COUNT) &&
((state == SHRES_SECURE) || (state == SHRES_NON_SECURE)));
if (registering_locked) {
if (shres_state[id] == state) {
return;
}
panic();
}
if ((shres_state[id] != SHRES_UNREGISTERED) &&
(shres_state[id] != state)) {
VERBOSE("Cannot change %s from %s to %s\n",
shres2str_id(id),
shres2str_state(shres_state[id]),
shres2str_state(state));
panic();
}
shres_state[id] = (uint8_t)state;
if (shres_state[id] == SHRES_UNREGISTERED) {
VERBOSE("Register %s as %s\n",
shres2str_id(id), shres2str_state(state));
}
switch (id) {
case STM32MP1_SHRES_GPIOZ(0) ... STM32MP1_SHRES_GPIOZ(7):
if ((id - STM32MP1_SHRES_GPIOZ(0)) >= get_gpioz_nbpin()) {
ERROR("Invalid GPIO pin %u, %u pin(s) available\n",
id - STM32MP1_SHRES_GPIOZ(0),
get_gpioz_nbpin());
panic();
}
break;
default:
break;
}
/* Explore clock tree to lock dependencies */
if (state == SHRES_SECURE) {
switch (id) {
case STM32MP1_SHRES_GPIOZ(0) ... STM32MP1_SHRES_GPIOZ(7):
stm32mp1_register_clock_parents_secure(GPIOZ);
break;
case STM32MP1_SHRES_IWDG1:
stm32mp1_register_clock_parents_secure(IWDG1);
break;
case STM32MP1_SHRES_USART1:
stm32mp1_register_clock_parents_secure(USART1_K);
break;
case STM32MP1_SHRES_SPI6:
stm32mp1_register_clock_parents_secure(SPI6_K);
break;
case STM32MP1_SHRES_I2C4:
stm32mp1_register_clock_parents_secure(I2C4_K);
break;
case STM32MP1_SHRES_RNG1:
stm32mp1_register_clock_parents_secure(RNG1_K);
break;
case STM32MP1_SHRES_HASH1:
stm32mp1_register_clock_parents_secure(HASH1);
break;
case STM32MP1_SHRES_CRYP1:
stm32mp1_register_clock_parents_secure(CRYP1);
break;
case STM32MP1_SHRES_I2C6:
stm32mp1_register_clock_parents_secure(I2C6_K);
break;
case STM32MP1_SHRES_RTC:
stm32mp1_register_clock_parents_secure(RTC);
break;
default:
/* No expected resource dependency */
break;
}
}
}
static bool stm32mp1_mckprot_resource(unsigned int id)
{
switch (id) {
case STM32MP1_SHRES_MCU:
case STM32MP1_SHRES_PLL3:
return true;
default:
return false;
}
}
/* Register resource by ID */
void stm32mp_register_secure_periph(unsigned int id)
{
register_periph(id, SHRES_SECURE);
}
void stm32mp_register_non_secure_periph(unsigned int id)
{
register_periph(id, SHRES_NON_SECURE);
}
/* Register resource by IO memory base address */
static void register_periph_iomem(uintptr_t base, unsigned int state)
{
unsigned int id;
switch (base) {
case IWDG1_BASE:
id = STM32MP1_SHRES_IWDG1;
break;
case USART1_BASE:
id = STM32MP1_SHRES_USART1;
break;
case SPI6_BASE:
id = STM32MP1_SHRES_SPI6;
break;
case I2C4_BASE:
id = STM32MP1_SHRES_I2C4;
break;
case I2C6_BASE:
id = STM32MP1_SHRES_I2C6;
break;
case RTC_BASE:
id = STM32MP1_SHRES_RTC;
break;
case RNG1_BASE:
id = STM32MP1_SHRES_RNG1;
break;
case CRYP1_BASE:
id = STM32MP1_SHRES_CRYP1;
break;
case HASH1_BASE:
id = STM32MP1_SHRES_HASH1;
break;
case GPIOA_BASE:
case GPIOB_BASE:
case GPIOC_BASE:
case GPIOD_BASE:
case GPIOE_BASE:
case GPIOF_BASE:
case GPIOG_BASE:
case GPIOH_BASE:
case GPIOI_BASE:
case GPIOJ_BASE:
case GPIOK_BASE:
case USART2_BASE:
case USART3_BASE:
case UART4_BASE:
case UART5_BASE:
case USART6_BASE:
case UART7_BASE:
case UART8_BASE:
case IWDG2_BASE:
/* Allow drivers to register some non-secure resources */
VERBOSE("IO for non-secure resource 0x%x\n",
(unsigned int)base);
if (state != SHRES_NON_SECURE) {
panic();
}
return;
default:
panic();
break;
}
register_periph(id, state);
}
void stm32mp_register_secure_periph_iomem(uintptr_t base)
{
register_periph_iomem(base, SHRES_SECURE);
}
void stm32mp_register_non_secure_periph_iomem(uintptr_t base)
{
register_periph_iomem(base, SHRES_NON_SECURE);
}
/* Register GPIO resource */
void stm32mp_register_secure_gpio(unsigned int bank, unsigned int pin)
{
switch (bank) {
case GPIO_BANK_Z:
register_periph(STM32MP1_SHRES_GPIOZ(pin), SHRES_SECURE);
break;
default:
ERROR("GPIO bank %u cannot be secured\n", bank);
panic();
}
}
void stm32mp_register_non_secure_gpio(unsigned int bank, unsigned int pin)
{
switch (bank) {
case GPIO_BANK_Z:
register_periph(STM32MP1_SHRES_GPIOZ(pin), SHRES_NON_SECURE);
break;
default:
break;
}
}
void stm32mp1_register_etzpc_decprot(unsigned int id,
enum etzpc_decprot_attributes attr)
{
unsigned int state = SHRES_SECURE;
unsigned int id_shres;
switch (attr) {
case TZPC_DECPROT_S_RW:
break;
case TZPC_DECPROT_NS_R_S_W:
case TZPC_DECPROT_MCU_ISOLATION:
case TZPC_DECPROT_NS_RW:
state = SHRES_NON_SECURE;
break;
default:
panic();
}
switch (id) {
case STM32MP1_ETZPC_STGENC_ID:
case STM32MP1_ETZPC_BKPSRAM_ID:
case STM32MP1_ETZPC_DDRCTRL_ID:
case STM32MP1_ETZPC_DDRPHYC_ID:
/* We assume these must always be assigned to secure world */
if (state != SHRES_SECURE) {
panic();
}
break;
default:
id_shres = decprot2shres(id);
if (id_shres == SHRES_INVALID) {
if (state == SHRES_SECURE) {
panic();
}
} else {
register_periph(id_shres, state);
}
break;
}
}
/* Get resource state: these accesses lock the registering support */
static void lock_registering(void)
{
registering_locked = true;
}
bool stm32mp1_periph_is_non_secure(unsigned long id)
{
lock_registering();
/* Resource not registered are assumed non-secure */
return (shres_state[id] == SHRES_NON_SECURE) ||
(shres_state[id] == SHRES_UNREGISTERED);
}
bool stm32mp1_periph_is_secure(unsigned long id)
{
lock_registering();
return shres_state[id] == SHRES_SECURE;
}
bool stm32mp_gpio_bank_is_shared(unsigned int bank)
{
unsigned int non_secure = 0;
unsigned int i;
lock_registering();
if (bank != GPIO_BANK_Z) {
return false;
}
for (i = 0U; i < get_gpioz_nbpin(); i++) {
if (!stm32mp1_periph_is_secure(STM32MP1_SHRES_GPIOZ(i))) {
non_secure++;
}
}
return (non_secure != 0) && (non_secure < get_gpioz_nbpin());
}
bool stm32mp_gpio_bank_is_non_secure(unsigned int bank)
{
unsigned int non_secure = 0;
unsigned int i;
lock_registering();
if (bank != GPIO_BANK_Z) {
return true;
}
for (i = 0U; i < get_gpioz_nbpin(); i++) {
if (!stm32mp1_periph_is_secure(STM32MP1_SHRES_GPIOZ(i))) {
non_secure++;
}
}
return non_secure == get_gpioz_nbpin();
}
static bool stm32mp_gpio_bank_is_secure(unsigned int bank)
{
unsigned int secure = 0;
unsigned int i;
lock_registering();
if (bank != GPIO_BANK_Z) {
return false;
}
for (i = 0U; i < get_gpioz_nbpin(); i++) {
if (stm32mp1_periph_is_secure(STM32MP1_SHRES_GPIOZ(i))) {
secure++;
}
}
return secure == get_gpioz_nbpin();
}
CASSERT((CK_HSE == 0) &&
((CK_HSE + 1) == CK_CSI) &&
((CK_HSE + 2) == CK_LSI) &&
((CK_HSE + 3) == CK_LSE) &&
((CK_HSE + 4) == CK_HSI) &&
((CK_HSE + 5) == CK_HSE_DIV2) &&
((PLL1_P + 1) == PLL1_Q) &&
((PLL1_P + 2) == PLL1_R) &&
((PLL1_P + 3) == PLL2_P) &&
((PLL1_P + 4) == PLL2_Q) &&
((PLL1_P + 5) == PLL2_R) &&
((PLL1_P + 6) == PLL3_P) &&
((PLL1_P + 7) == PLL3_Q) &&
((PLL1_P + 8) == PLL3_R),
assert_clock_id_not_as_expected);
bool stm32mp_nsec_can_access_clock(unsigned long clock_id)
{
enum stm32mp_shres shres_id = STM32MP1_SHRES_COUNT;
/* Oscillators and PLLs are visible from non-secure world */
if ((clock_id <= CK_HSE_DIV2) ||
((clock_id >= PLL1_P) && (clock_id <= PLL3_R))) {
return true;
}
switch (clock_id) {
case BSEC:
case CK_AXI:
case CK_MPU:
case RTCAPB:
return true;
case GPIOZ:
return !stm32mp_gpio_bank_is_secure(GPIO_BANK_Z);
case SPI6_K:
shres_id = STM32MP1_SHRES_SPI6;
break;
case I2C4_K:
shres_id = STM32MP1_SHRES_I2C4;
break;
case I2C6_K:
shres_id = STM32MP1_SHRES_I2C6;
break;
case USART1_K:
shres_id = STM32MP1_SHRES_USART1;
break;
case IWDG1:
shres_id = STM32MP1_SHRES_IWDG1;
break;
case CRYP1:
shres_id = STM32MP1_SHRES_CRYP1;
break;
case HASH1:
shres_id = STM32MP1_SHRES_HASH1;
break;
case RNG1_K:
shres_id = STM32MP1_SHRES_RNG1;
break;
case RTC:
shres_id = STM32MP1_SHRES_RTC;
break;
case CK_MCU:
shres_id = STM32MP1_SHRES_MCU;
break;
default:
return false;
}
return !stm32mp1_periph_is_secure(shres_id);
}
bool stm32mp_nsec_can_access_reset(unsigned int reset_id)
{
enum stm32mp_shres shres_id = STM32MP1_SHRES_COUNT;
switch (reset_id) {
case GPIOZ_R:
return stm32mp_gpio_bank_is_non_secure(GPIO_BANK_Z);
case SPI6_R:
shres_id = STM32MP1_SHRES_SPI6;
break;
case I2C4_R:
shres_id = STM32MP1_SHRES_I2C4;
break;
case I2C6_R:
shres_id = STM32MP1_SHRES_I2C6;
break;
case USART1_R:
shres_id = STM32MP1_SHRES_USART1;
break;
case CRYP1_R:
shres_id = STM32MP1_SHRES_CRYP1;
break;
case HASH1_R:
shres_id = STM32MP1_SHRES_HASH1;
break;
case RNG1_R:
shres_id = STM32MP1_SHRES_RNG1;
break;
case MDMA_R:
shres_id = STM32MP1_SHRES_MDMA;
break;
case MCU_R:
shres_id = STM32MP1_SHRES_MCU;
break;
default:
return false;
}
return !stm32mp1_periph_is_secure(shres_id);
}
/* ETZPC configuration at drivers initialization completion */
static enum etzpc_decprot_attributes decprot_periph_attr(unsigned int id)
{
switch (id) {
case STM32MP1_SHRES_GPIOZ(0) ... STM32MP1_SHRES_GPIOZ(7):
assert((id - STM32MP1_SHRES_GPIOZ(0)) < get_gpioz_nbpin());
return TZPC_DECPROT_NS_RW;
default:
if (!stm32mp1_periph_is_secure(id)) {
return TZPC_DECPROT_NS_RW;
}
return TZPC_DECPROT_S_RW;
}
}
static bool check_decprot(unsigned int id, enum etzpc_decprot_attributes exp)
{
enum etzpc_decprot_attributes cur = etzpc_get_decprot(id);
if (cur == exp) {
return true;
}
switch (exp) {
case TZPC_DECPROT_NS_RW:
if (cur == TZPC_DECPROT_S_RW) {
INFO("ETZPC: %s (%d) could be non secure\n",
decprot2str(id), id);
}
return true;
case TZPC_DECPROT_S_RW:
ERROR("ETZPC: %s (%d) expected secure but DECPROT = %d\n",
decprot2str(id), id, cur);
break;
case TZPC_DECPROT_NS_R_S_W:
case TZPC_DECPROT_MCU_ISOLATION:
default:
panic();
}
return false;
}
static void check_etzpc_secure_configuration(void)
{
bool error = false;
assert(registering_locked);
error |= !check_decprot(STM32MP1_ETZPC_STGENC_ID, TZPC_DECPROT_S_RW);
error |= !check_decprot(STM32MP1_ETZPC_BKPSRAM_ID, TZPC_DECPROT_S_RW);
error |= !check_decprot(STM32MP1_ETZPC_USART1_ID,
decprot_periph_attr(STM32MP1_SHRES_USART1));
error |= !check_decprot(STM32MP1_ETZPC_SPI6_ID,
decprot_periph_attr(STM32MP1_SHRES_SPI6));
error |= !check_decprot(STM32MP1_ETZPC_I2C4_ID,
decprot_periph_attr(STM32MP1_SHRES_I2C4));
error |= !check_decprot(STM32MP1_ETZPC_RNG1_ID,
decprot_periph_attr(STM32MP1_SHRES_RNG1));
error |= !check_decprot(STM32MP1_ETZPC_HASH1_ID,
decprot_periph_attr(STM32MP1_SHRES_HASH1));
error |= !check_decprot(STM32MP1_ETZPC_CRYP1_ID,
decprot_periph_attr(STM32MP1_SHRES_CRYP1));
error |= !check_decprot(STM32MP1_ETZPC_DDRCTRL_ID, TZPC_DECPROT_S_RW);
error |= !check_decprot(STM32MP1_ETZPC_DDRPHYC_ID, TZPC_DECPROT_S_RW);
error |= !check_decprot(STM32MP1_ETZPC_I2C6_ID,
decprot_periph_attr(STM32MP1_SHRES_I2C6));
if (error) {
panic();
}
}
static void check_rcc_secure_configuration(void)
{
uint32_t n;
uint32_t error = 0;
bool mckprot = stm32mp1_rcc_is_mckprot();
bool secure = stm32mp1_rcc_is_secure();
for (n = 0; n < ARRAY_SIZE(shres_state); n++) {
if (shres_state[n] == SHRES_SECURE) {
if ((stm32mp1_mckprot_resource(n) && (!mckprot)) ||
!secure) {
ERROR("RCC %s MCKPROT %s and %s (%u) secure\n",
secure ? "secure" : "non secure",
mckprot ? "set" : "not set",
shres2str_id(n), n);
error++;
}
}
}
if (error != 0U) {
panic();
}
}
static void check_gpio_secure_configuration(void)
{
uint32_t pin;
for (pin = 0U; pin < get_gpioz_nbpin(); pin++) {
unsigned int id = STM32MP1_SHRES_GPIOZ(pin);
bool secure = stm32mp1_periph_is_secure(id);
set_gpio_secure_cfg(GPIO_BANK_Z, pin, secure);
}
}
void stm32mp_lock_periph_registering(void)
{
uint32_t __unused id;
registering_locked = true;
for (id = 0; id < STM32MP1_SHRES_COUNT; id++) {
uint8_t state = shres_state[id];
assert((state == SHRES_SECURE) ||
(state == SHRES_NON_SECURE) ||
(state == SHRES_UNREGISTERED));
if (state == SHRES_SECURE) {
INFO("stm32mp %s (%u): %s\n",
shres2str_id(id), id,
state == SHRES_SECURE ? "Secure" :
state == SHRES_NON_SECURE ? "Non-secure" :
state == SHRES_UNREGISTERED ? "Unregistered" :
"<Invalid>");
}
}
stm32mp1_dump_clocks_state();
check_rcc_secure_configuration();
check_etzpc_secure_configuration();
check_gpio_secure_configuration();
}