ACRY is designed to accelerate ECC/RSA digital signature generation and verification.
Signed-off-by: Chia-Wei Wang chiawei_wang@aspeedtech.com --- drivers/crypto/aspeed/Kconfig | 10 ++ drivers/crypto/aspeed/Makefile | 1 + drivers/crypto/aspeed/aspeed_acry.c | 190 ++++++++++++++++++++++++++++ lib/rsa/Kconfig | 10 +- 4 files changed, 210 insertions(+), 1 deletion(-) create mode 100644 drivers/crypto/aspeed/aspeed_acry.c
diff --git a/drivers/crypto/aspeed/Kconfig b/drivers/crypto/aspeed/Kconfig index 471c06f986..9bf317177a 100644 --- a/drivers/crypto/aspeed/Kconfig +++ b/drivers/crypto/aspeed/Kconfig @@ -8,3 +8,13 @@ config ASPEED_HACE Enabling this allows the use of SHA operations in hardware without requiring the SHA software implementations. It also improves performance and saves code size. + +config ASPEED_ACRY + bool "ASPEED RSA and ECC Engine" + depends on ASPEED_AST2600 + help + Select this option to enable a driver for using the RSA/ECC engine in + the ASPEED BMC SoCs. + + Enabling this allows the use of RSA/ECC operations in hardware without requiring the + software implementations. It also improves performance and saves code size. diff --git a/drivers/crypto/aspeed/Makefile b/drivers/crypto/aspeed/Makefile index 84e6bfe82a..58b55fc46e 100644 --- a/drivers/crypto/aspeed/Makefile +++ b/drivers/crypto/aspeed/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_ASPEED_HACE) += aspeed_hace.o +obj-$(CONFIG_ASPEED_ACRY) += aspeed_acry.o diff --git a/drivers/crypto/aspeed/aspeed_acry.c b/drivers/crypto/aspeed/aspeed_acry.c new file mode 100644 index 0000000000..c28cdf374b --- /dev/null +++ b/drivers/crypto/aspeed/aspeed_acry.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2021 ASPEED Technology Inc. + */ +#include <config.h> +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <asm/types.h> +#include <asm/io.h> +#include <dm/device.h> +#include <dm/fdtaddr.h> +#include <linux/delay.h> +#include <u-boot/rsa-mod-exp.h> + +/* ACRY register offsets */ +#define ACRY_CTRL1 0x00 +#define ACRY_CTRL1_RSA_DMA BIT(1) +#define ACRY_CTRL1_RSA_START BIT(0) +#define ACRY_CTRL2 0x44 +#define ACRY_CTRL3 0x48 +#define ACRY_CTRL3_SRAM_AHB_ACCESS BIT(8) +#define ACRY_CTRL3_ECC_RSA_MODE_MASK GENMASK(5, 4) +#define ACRY_CTRL3_ECC_RSA_MODE_SHIFT 4 +#define ACRY_DMA_DRAM_SADDR 0x4c +#define ACRY_DMA_DMEM_TADDR 0x50 +#define ACRY_DMA_DMEM_TADDR_LEN_MASK GENMASK(15, 0) +#define ACRY_DMA_DMEM_TADDR_LEN_SHIFT 0 +#define ACRY_RSA_PARAM 0x58 +#define ACRY_RSA_PARAM_EXP_MASK GENMASK(31, 16) +#define ACRY_RSA_PARAM_EXP_SHIFT 16 +#define ACRY_RSA_PARAM_MOD_MASK GENMASK(15, 0) +#define ACRY_RSA_PARAM_MOD_SHIFT 0 +#define ACRY_RSA_INT_EN 0x3f8 +#define ACRY_RSA_INT_EN_RSA_READY BIT(2) +#define ACRY_RSA_INT_EN_RSA_CMPLT BIT(1) +#define ACRY_RSA_INT_STS 0x3fc +#define ACRY_RSA_INT_STS_RSA_READY BIT(2) +#define ACRY_RSA_INT_STS_RSA_CMPLT BIT(1) + +/* misc. constant */ +#define ACRY_ECC_MODE 2 +#define ACRY_RSA_MODE 3 +#define ACRY_CTX_BUFSZ 0x600 + +struct aspeed_acry { + phys_addr_t base; + phys_addr_t sram_base; /* internal sram */ + struct clk clk; +}; + +static int aspeed_acry_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len, + struct key_prop *prop, uint8_t *out) +{ + int i, j; + u8 *ctx; + u8 *ptr; + u32 reg; + struct aspeed_acry *acry = dev_get_priv(dev); + + ctx = memalign(16, ACRY_CTX_BUFSZ); + if (!ctx) + return -ENOMEM; + + memset(ctx, 0, ACRY_CTX_BUFSZ); + + ptr = (u8 *)prop->public_exponent; + for (i = prop->exp_len - 1, j = 0; i >= 0; --i) { + ctx[j] = ptr[i]; + j++; + j = (j % 16) ? j : j + 32; + } + + ptr = (u8 *)prop->modulus; + for (i = (prop->num_bits >> 3) - 1, j = 0; i >= 0; --i) { + ctx[j + 16] = ptr[i]; + j++; + j = (j % 16) ? j : j + 32; + } + + ptr = (u8 *)sig; + for (i = sig_len - 1, j = 0; i >= 0; --i) { + ctx[j + 32] = ptr[i]; + j++; + j = (j % 16) ? j : j + 32; + } + + writel((u32)ctx, acry->base + ACRY_DMA_DRAM_SADDR); + + reg = (((prop->exp_len << 3) << ACRY_RSA_PARAM_EXP_SHIFT) & ACRY_RSA_PARAM_EXP_MASK) | + ((prop->num_bits << ACRY_RSA_PARAM_MOD_SHIFT) & ACRY_RSA_PARAM_MOD_MASK); + writel(reg, acry->base + ACRY_RSA_PARAM); + + reg = (ACRY_CTX_BUFSZ << ACRY_DMA_DMEM_TADDR_LEN_SHIFT) & ACRY_DMA_DMEM_TADDR_LEN_MASK; + writel(reg, acry->base + ACRY_DMA_DMEM_TADDR); + + reg = (ACRY_RSA_MODE << ACRY_CTRL3_ECC_RSA_MODE_SHIFT) & ACRY_CTRL3_ECC_RSA_MODE_MASK; + writel(reg, acry->base + ACRY_CTRL3); + + writel(ACRY_CTRL1_RSA_DMA | ACRY_CTRL1_RSA_START, acry->base + ACRY_CTRL1); + + /* polling RSA status */ + while (1) { + reg = readl(acry->base + ACRY_RSA_INT_STS); + if ((reg & ACRY_RSA_INT_STS_RSA_READY) && (reg & ACRY_RSA_INT_STS_RSA_CMPLT)) { + writel(reg, ACRY_RSA_INT_STS); + break; + } + udelay(20); + } + + /* grant SRAM access permission to CPU */ + writel(0x0, acry->base + ACRY_CTRL1); + writel(ACRY_CTRL3_SRAM_AHB_ACCESS, acry->base + ACRY_CTRL3); + udelay(20); + + for (i = (prop->num_bits / 8) - 1, j = 0; i >= 0; --i) { + out[i] = readb(acry->sram_base + (j + 32)); + j++; + j = (j % 16) ? j : j + 32; + } + + /* return SRAM access permission to ACRY */ + writel(0, acry->base + ACRY_CTRL3); + + free(ctx); + + return 0; +} + +static int aspeed_acry_probe(struct udevice *dev) +{ + struct aspeed_acry *acry = dev_get_priv(dev); + int ret; + + ret = clk_get_by_index(dev, 0, &acry->clk); + if (ret < 0) { + debug("Can't get clock for %s: %d\n", dev->name, ret); + return ret; + } + + ret = clk_enable(&acry->clk); + if (ret) { + debug("Failed to enable acry clock (%d)\n", ret); + return ret; + } + + acry->base = devfdt_get_addr_index(dev, 0); + if (acry->base == FDT_ADDR_T_NONE) { + debug("Failed to get acry base\n"); + return acry->base; + } + + acry->sram_base = devfdt_get_addr_index(dev, 1); + if (acry->sram_base == FDT_ADDR_T_NONE) { + debug("Failed to get acry SRAM base\n"); + return acry->sram_base; + } + + return ret; +} + +static int aspeed_acry_remove(struct udevice *dev) +{ + struct aspeed_acry *acry = dev_get_priv(dev); + + clk_disable(&acry->clk); + + return 0; +} + +static const struct mod_exp_ops aspeed_acry_ops = { + .mod_exp = aspeed_acry_mod_exp, +}; + +static const struct udevice_id aspeed_acry_ids[] = { + { .compatible = "aspeed,ast2600-acry" }, + { } +}; + +U_BOOT_DRIVER(aspeed_acry) = { + .name = "aspeed_acry", + .id = UCLASS_MOD_EXP, + .of_match = aspeed_acry_ids, + .probe = aspeed_acry_probe, + .remove = aspeed_acry_remove, + .priv_auto = sizeof(struct aspeed_acry), + .ops = &aspeed_acry_ops, + .flags = DM_FLAG_PRE_RELOC, +}; diff --git a/lib/rsa/Kconfig b/lib/rsa/Kconfig index 469596abe7..be9775bcce 100644 --- a/lib/rsa/Kconfig +++ b/lib/rsa/Kconfig @@ -1,7 +1,8 @@ config RSA bool "Use RSA Library" select RSA_FREESCALE_EXP if FSL_CAAM && !ARCH_MX7 && !ARCH_MX7ULP && !ARCH_MX6 && !ARCH_MX5 - select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP + select RSA_ASPEED_EXP if ASPEED_ACRY + select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP && !RSA_ASPEED_EXP help RSA support. This enables the RSA algorithm used for FIT image verification in U-Boot. @@ -62,4 +63,11 @@ config RSA_FREESCALE_EXP Enables driver for RSA modular exponentiation using Freescale cryptographic accelerator - CAAM.
+config RSA_ASPEED_EXP + bool "Enable RSA Modular Exponentiation with ASPEED crypto accelerator" + depends on DM && ASPEED_ACRY + help + Enables driver for RSA modular exponentiation using ASPEED cryptographic + accelerator - ACRY + endif