diff options
Diffstat (limited to 'drivers/st/crypto/stm32_hash.c')
| -rw-r--r-- | drivers/st/crypto/stm32_hash.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/drivers/st/crypto/stm32_hash.c b/drivers/st/crypto/stm32_hash.c new file mode 100644 index 0000000..e92f980 --- /dev/null +++ b/drivers/st/crypto/stm32_hash.c @@ -0,0 +1,364 @@ +/* + * Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <errno.h> +#include <stdint.h> + +#include <arch_helpers.h> +#include <common/debug.h> +#include <drivers/clk.h> +#include <drivers/delay_timer.h> +#include <drivers/st/stm32_hash.h> +#include <drivers/st/stm32mp_reset.h> +#include <lib/mmio.h> +#include <lib/utils.h> +#include <libfdt.h> +#include <plat/common/platform.h> + +#include <platform_def.h> + +#if STM32_HASH_VER == 2 +#define DT_HASH_COMPAT "st,stm32f756-hash" +#endif +#if STM32_HASH_VER == 4 +#define DT_HASH_COMPAT "st,stm32mp13-hash" +#endif + +#define HASH_CR 0x00U +#define HASH_DIN 0x04U +#define HASH_STR 0x08U +#define HASH_SR 0x24U +#define HASH_HREG(x) (0x310U + ((x) * 0x04U)) + +/* Control Register */ +#define HASH_CR_INIT BIT(2) +#define HASH_CR_DATATYPE_SHIFT U(4) +#if STM32_HASH_VER == 2 +#define HASH_CR_ALGO_SHA1 0x0U +#define HASH_CR_ALGO_MD5 BIT(7) +#define HASH_CR_ALGO_SHA224 BIT(18) +#define HASH_CR_ALGO_SHA256 (BIT(18) | BIT(7)) +#endif +#if STM32_HASH_VER == 4 +#define HASH_CR_ALGO_SHIFT U(17) +#define HASH_CR_ALGO_SHA1 (0x0U << HASH_CR_ALGO_SHIFT) +#define HASH_CR_ALGO_SHA224 (0x2U << HASH_CR_ALGO_SHIFT) +#define HASH_CR_ALGO_SHA256 (0x3U << HASH_CR_ALGO_SHIFT) +#define HASH_CR_ALGO_SHA384 (0xCU << HASH_CR_ALGO_SHIFT) +#define HASH_CR_ALGO_SHA512_224 (0xDU << HASH_CR_ALGO_SHIFT) +#define HASH_CR_ALGO_SHA512_256 (0xEU << HASH_CR_ALGO_SHIFT) +#define HASH_CR_ALGO_SHA512 (0xFU << HASH_CR_ALGO_SHIFT) +#endif + +/* Status Flags */ +#define HASH_SR_DCIS BIT(1) +#define HASH_SR_BUSY BIT(3) + +/* STR Register */ +#define HASH_STR_NBLW_MASK GENMASK(4, 0) +#define HASH_STR_DCAL BIT(8) + +#define MD5_DIGEST_SIZE 16U +#define SHA1_DIGEST_SIZE 20U +#define SHA224_DIGEST_SIZE 28U +#define SHA256_DIGEST_SIZE 32U +#define SHA384_DIGEST_SIZE 48U +#define SHA512_224_DIGEST_SIZE 28U +#define SHA512_256_DIGEST_SIZE 32U +#define SHA512_DIGEST_SIZE 64U + +#define RESET_TIMEOUT_US_1MS 1000U +#define HASH_TIMEOUT_US 10000U + +enum stm32_hash_data_format { + HASH_DATA_32_BITS, + HASH_DATA_16_BITS, + HASH_DATA_8_BITS, + HASH_DATA_1_BIT +}; + +struct stm32_hash_instance { + uintptr_t base; + unsigned int clock; + size_t digest_size; +}; + +struct stm32_hash_remain { + uint32_t buffer; + size_t length; +}; + +/* Expect a single HASH peripheral */ +static struct stm32_hash_instance stm32_hash; +static struct stm32_hash_remain stm32_remain; + +static uintptr_t hash_base(void) +{ + return stm32_hash.base; +} + +static int hash_wait_busy(void) +{ + uint64_t timeout = timeout_init_us(HASH_TIMEOUT_US); + + while ((mmio_read_32(hash_base() + HASH_SR) & HASH_SR_BUSY) != 0U) { + if (timeout_elapsed(timeout)) { + ERROR("%s: busy timeout\n", __func__); + return -ETIMEDOUT; + } + } + + return 0; +} + +static int hash_wait_computation(void) +{ + uint64_t timeout = timeout_init_us(HASH_TIMEOUT_US); + + while ((mmio_read_32(hash_base() + HASH_SR) & HASH_SR_DCIS) == 0U) { + if (timeout_elapsed(timeout)) { + ERROR("%s: busy timeout\n", __func__); + return -ETIMEDOUT; + } + } + + return 0; +} + +static int hash_write_data(uint32_t data) +{ + int ret; + + ret = hash_wait_busy(); + if (ret != 0) { + return ret; + } + + mmio_write_32(hash_base() + HASH_DIN, data); + + return 0; +} + +static void hash_hw_init(enum stm32_hash_algo_mode mode) +{ + uint32_t reg; + + reg = HASH_CR_INIT | (HASH_DATA_8_BITS << HASH_CR_DATATYPE_SHIFT); + + switch (mode) { +#if STM32_HASH_VER == 2 + case HASH_MD5SUM: + reg |= HASH_CR_ALGO_MD5; + stm32_hash.digest_size = MD5_DIGEST_SIZE; + break; +#endif + case HASH_SHA1: + reg |= HASH_CR_ALGO_SHA1; + stm32_hash.digest_size = SHA1_DIGEST_SIZE; + break; + case HASH_SHA224: + reg |= HASH_CR_ALGO_SHA224; + stm32_hash.digest_size = SHA224_DIGEST_SIZE; + break; +#if STM32_HASH_VER == 4 + case HASH_SHA384: + reg |= HASH_CR_ALGO_SHA384; + stm32_hash.digest_size = SHA384_DIGEST_SIZE; + break; + case HASH_SHA512: + reg |= HASH_CR_ALGO_SHA512; + stm32_hash.digest_size = SHA512_DIGEST_SIZE; + break; +#endif + /* Default selected algo is SHA256 */ + case HASH_SHA256: + default: + reg |= HASH_CR_ALGO_SHA256; + stm32_hash.digest_size = SHA256_DIGEST_SIZE; + break; + } + + mmio_write_32(hash_base() + HASH_CR, reg); +} + +static int hash_get_digest(uint8_t *digest) +{ + int ret; + uint32_t i; + uint32_t dsg; + + ret = hash_wait_computation(); + if (ret != 0) { + return ret; + } + + for (i = 0U; i < (stm32_hash.digest_size / sizeof(uint32_t)); i++) { + dsg = __builtin_bswap32(mmio_read_32(hash_base() + + HASH_HREG(i))); + memcpy(digest + (i * sizeof(uint32_t)), &dsg, sizeof(uint32_t)); + } + + /* + * Clean hardware context as HASH could be used later + * by non-secure software + */ + hash_hw_init(HASH_SHA256); + + return 0; +} + +int stm32_hash_update(const uint8_t *buffer, size_t length) +{ + size_t remain_length = length; + int ret = 0; + + if ((length == 0U) || (buffer == NULL)) { + return 0; + } + + clk_enable(stm32_hash.clock); + + if (stm32_remain.length != 0U) { + uint32_t copysize; + + copysize = MIN((sizeof(uint32_t) - stm32_remain.length), + length); + memcpy(((uint8_t *)&stm32_remain.buffer) + stm32_remain.length, + buffer, copysize); + remain_length -= copysize; + buffer += copysize; + if (stm32_remain.length == sizeof(uint32_t)) { + ret = hash_write_data(stm32_remain.buffer); + if (ret != 0) { + goto exit; + } + + zeromem(&stm32_remain, sizeof(stm32_remain)); + } + } + + while (remain_length / sizeof(uint32_t) != 0U) { + uint32_t tmp_buf; + + memcpy(&tmp_buf, buffer, sizeof(uint32_t)); + ret = hash_write_data(tmp_buf); + if (ret != 0) { + goto exit; + } + + buffer += sizeof(uint32_t); + remain_length -= sizeof(uint32_t); + } + + if (remain_length != 0U) { + assert(stm32_remain.length == 0U); + + memcpy((uint8_t *)&stm32_remain.buffer, buffer, remain_length); + stm32_remain.length = remain_length; + } + +exit: + clk_disable(stm32_hash.clock); + + return ret; +} + +int stm32_hash_final(uint8_t *digest) +{ + int ret; + + clk_enable(stm32_hash.clock); + + if (stm32_remain.length != 0U) { + ret = hash_write_data(stm32_remain.buffer); + if (ret != 0) { + clk_disable(stm32_hash.clock); + return ret; + } + + mmio_clrsetbits_32(hash_base() + HASH_STR, HASH_STR_NBLW_MASK, + 8U * stm32_remain.length); + zeromem(&stm32_remain, sizeof(stm32_remain)); + } else { + mmio_clrbits_32(hash_base() + HASH_STR, HASH_STR_NBLW_MASK); + } + + mmio_setbits_32(hash_base() + HASH_STR, HASH_STR_DCAL); + + ret = hash_get_digest(digest); + + clk_disable(stm32_hash.clock); + + return ret; +} + +int stm32_hash_final_update(const uint8_t *buffer, uint32_t length, + uint8_t *digest) +{ + int ret; + + ret = stm32_hash_update(buffer, length); + if (ret != 0) { + return ret; + } + + return stm32_hash_final(digest); +} + +void stm32_hash_init(enum stm32_hash_algo_mode mode) +{ + clk_enable(stm32_hash.clock); + + hash_hw_init(mode); + + clk_disable(stm32_hash.clock); + + zeromem(&stm32_remain, sizeof(stm32_remain)); +} + +int stm32_hash_register(void) +{ + struct dt_node_info hash_info; + int node; + + for (node = dt_get_node(&hash_info, -1, DT_HASH_COMPAT); + node != -FDT_ERR_NOTFOUND; + node = dt_get_node(&hash_info, node, DT_HASH_COMPAT)) { + if (hash_info.status != DT_DISABLED) { + break; + } + } + + if (node == -FDT_ERR_NOTFOUND) { + return -ENODEV; + } + + if (hash_info.clock < 0) { + return -EINVAL; + } + + stm32_hash.base = hash_info.base; + stm32_hash.clock = hash_info.clock; + + clk_enable(stm32_hash.clock); + + if (hash_info.reset >= 0) { + uint32_t id = (uint32_t)hash_info.reset; + + if (stm32mp_reset_assert(id, RESET_TIMEOUT_US_1MS) != 0) { + panic(); + } + udelay(20); + if (stm32mp_reset_deassert(id, RESET_TIMEOUT_US_1MS) != 0) { + panic(); + } + } + + clk_disable(stm32_hash.clock); + + return 0; +} |