ARCY is deisnged to accerlerate 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_arcy.c | 182 ++++++++++++++++++++++++++++ lib/rsa/Kconfig | 10 +- 4 files changed, 202 insertions(+), 1 deletion(-) create mode 100644 drivers/crypto/aspeed/aspeed_arcy.c
diff --git a/drivers/crypto/aspeed/Kconfig b/drivers/crypto/aspeed/Kconfig index 299efc223f..9d896afa8a 100644 --- a/drivers/crypto/aspeed/Kconfig +++ b/drivers/crypto/aspeed/Kconfig @@ -10,3 +10,13 @@ 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_ARCY + 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..8de95eef7e 100644 --- a/drivers/crypto/aspeed/Makefile +++ b/drivers/crypto/aspeed/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_ASPEED_HACE) += aspeed_hace.o +obj-$(CONFIG_ASPEED_ARCY) += aspeed_arcy.o diff --git a/drivers/crypto/aspeed/aspeed_arcy.c b/drivers/crypto/aspeed/aspeed_arcy.c new file mode 100644 index 0000000000..d3da869f83 --- /dev/null +++ b/drivers/crypto/aspeed/aspeed_arcy.c @@ -0,0 +1,182 @@ +// 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> + +/* ARCY register offsets */ +#define ARCY_CTRL1 0x00 +#define ARCY_CTRL1_RSA_DMA BIT(1) +#define ARCY_CTRL1_RSA_START BIT(0) +#define ARCY_CTRL2 0x44 +#define ARCY_CTRL3 0x48 +#define ARCY_CTRL3_SRAM_AHB_ACCESS BIT(8) +#define ARCY_CTRL3_ECC_RSA_MODE_MASK GENMASK(5, 4) +#define ARCY_CTRL3_ECC_RSA_MODE_SHIFT 4 +#define ARCY_DMA_DRAM_SADDR 0x4c +#define ARCY_DMA_DMEM_TADDR 0x50 +#define ARCY_DMA_DMEM_TADDR_LEN_MASK GENMASK(15, 0) +#define ARCY_DMA_DMEM_TADDR_LEN_SHIFT 0 +#define ARCY_RSA_PARAM 0x58 +#define ARCY_RSA_PARAM_EXP_MASK GENMASK(31, 16) +#define ARCY_RSA_PARAM_EXP_SHIFT 16 +#define ARCY_RSA_PARAM_MOD_MASK GENMASK(15, 0) +#define ARCY_RSA_PARAM_MOD_SHIFT 0 +#define ARCY_RSA_INT_EN 0x3f8 +#define ARCY_RSA_INT_EN_RSA_READY BIT(2) +#define ARCY_RSA_INT_EN_RSA_CMPLT BIT(1) +#define ARCY_RSA_INT_STS 0x3fc +#define ARCY_RSA_INT_STS_RSA_READY BIT(2) +#define ARCY_RSA_INT_STS_RSA_CMPLT BIT(1) + +/* misc. constant */ +#define ARCY_ECC_MODE 2 +#define ARCY_RSA_MODE 3 +#define ARCY_CTX_BUFSZ 0x600 + +struct aspeed_arcy { + phys_addr_t base; + phys_addr_t sram_base; /* internal sram */ + struct clk clk; +}; + +static int aspeed_arcy_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_arcy *arcy = dev_get_priv(dev); + + ctx = memalign(16, ARCY_CTX_BUFSZ); + if (!ctx) + return -ENOMEM; + + memset(ctx, 0, ARCY_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, arcy->base + ARCY_DMA_DRAM_SADDR); + + reg = (((prop->exp_len << 3) << ARCY_RSA_PARAM_EXP_SHIFT) & ARCY_RSA_PARAM_EXP_MASK) | + ((prop->num_bits << ARCY_RSA_PARAM_MOD_SHIFT) & ARCY_RSA_PARAM_MOD_MASK); + writel(reg, arcy->base + ARCY_RSA_PARAM); + + reg = (ARCY_CTX_BUFSZ << ARCY_DMA_DMEM_TADDR_LEN_SHIFT) & ARCY_DMA_DMEM_TADDR_LEN_MASK; + writel(reg, arcy->base + ARCY_DMA_DMEM_TADDR); + + reg = (ARCY_RSA_MODE << ARCY_CTRL3_ECC_RSA_MODE_SHIFT) & ARCY_CTRL3_ECC_RSA_MODE_MASK; + writel(reg, arcy->base + ARCY_CTRL3); + + writel(ARCY_CTRL1_RSA_DMA | ARCY_CTRL1_RSA_START, arcy->base + ARCY_CTRL1); + + /* polling RSA status */ + while (1) { + reg = readl(arcy->base + ARCY_RSA_INT_STS); + if ((reg & ARCY_RSA_INT_STS_RSA_READY) && (reg & ARCY_RSA_INT_STS_RSA_CMPLT)) + break; + udelay(20); + } + + writel(0x0, arcy->base + ARCY_CTRL1); + writel(ARCY_CTRL3_SRAM_AHB_ACCESS, arcy->base + ARCY_CTRL3); + udelay(20); + + for (i = (prop->num_bits / 8) - 1, j = 0; i >= 0; --i) { + out[i] = readb(arcy->sram_base + (j + 32)); + j++; + j = (j % 16) ? j : j + 32; + } + + return 0; +} + +static int aspeed_arcy_probe(struct udevice *dev) +{ + struct aspeed_arcy *arcy = dev_get_priv(dev); + int ret; + + ret = clk_get_by_index(dev, 0, &arcy->clk); + if (ret < 0) { + debug("Can't get clock for %s: %d\n", dev->name, ret); + return ret; + } + + ret = clk_enable(&arcy->clk); + if (ret) { + debug("Failed to enable arcy clock (%d)\n", ret); + return ret; + } + + arcy->base = devfdt_get_addr_index(dev, 0); + if (arcy->base == FDT_ADDR_T_NONE) { + debug("Failed to get arcy base\n"); + return arcy->base; + } + + arcy->sram_base = devfdt_get_addr_index(dev, 1); + if (arcy->sram_base == FDT_ADDR_T_NONE) { + debug("Failed to get arcy SRAM base\n"); + return arcy->sram_base; + } + + return ret; +} + +static int aspeed_arcy_remove(struct udevice *dev) +{ + struct aspeed_arcy *arcy = dev_get_priv(dev); + + clk_disable(&arcy->clk); + + return 0; +} + +static const struct mod_exp_ops aspeed_arcy_ops = { + .mod_exp = aspeed_arcy_mod_exp, +}; + +static const struct udevice_id aspeed_arcy_ids[] = { + { .compatible = "aspeed,ast2600-arcy" }, + { } +}; + +U_BOOT_DRIVER(aspeed_arcy) = { + .name = "aspeed_arcy", + .id = UCLASS_MOD_EXP, + .of_match = aspeed_arcy_ids, + .probe = aspeed_arcy_probe, + .remove = aspeed_arcy_remove, + .priv_auto = sizeof(struct aspeed_arcy), + .ops = &aspeed_arcy_ops, + .flags = DM_FLAG_PRE_RELOC, +}; diff --git a/lib/rsa/Kconfig b/lib/rsa/Kconfig index a90d67e5a8..81c0936e58 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_MX6 && !ARCH_MX5 - select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP + select RSA_ASPEED_EXP if ASPEED_ARCY + 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. @@ -61,4 +62,11 @@ 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_ARCY + help + Enables driver for RSA modular exponentiation using ASPEED cryptographic + accelerator - ARCY + endif