[PATCH] crypto: Add driver for Aspeed HACE
Joel Stanley
joel at jms.id.au
Tue May 18 09:09:26 CEST 2021
The HACE supports MD5, SHA1 and SHA2 family hash functions. This driver
uses it in a polling mode to perform hash calculations over buffers
placed in DRAM.
It registers a driver to allow the hardware's clocking to be enabled
using the clock framework.
Co-developed-by: Klaus Heinrich Kiwi <klaus at linux.vnet.ibm.com>
Signed-off-by: Klaus Heinrich Kiwi <klaus at linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel at jms.id.au>
---
configs/evb-ast2600_defconfig | 1 +
drivers/crypto/Kconfig | 19 +++
drivers/crypto/Makefile | 1 +
drivers/crypto/aspeed_hace.c | 256 ++++++++++++++++++++++++++++++++++
4 files changed, 277 insertions(+)
create mode 100644 drivers/crypto/aspeed_hace.c
diff --git a/configs/evb-ast2600_defconfig b/configs/evb-ast2600_defconfig
index 91518dbe3589..52ae8e423bfd 100644
--- a/configs/evb-ast2600_defconfig
+++ b/configs/evb-ast2600_defconfig
@@ -45,6 +45,7 @@ CONFIG_REGMAP=y
CONFIG_SPL_OF_TRANSLATE=y
CONFIG_CLK=y
CONFIG_SPL_CLK=y
+CONFIG_ASPEED_HACE=y
CONFIG_DM_I2C=y
CONFIG_MISC=y
CONFIG_SPL_MISC=y
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 1ea116be7503..e92037d88906 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -2,4 +2,23 @@ menu "Hardware crypto devices"
source drivers/crypto/fsl/Kconfig
+config ASPEED_HACE
+ bool "ASPEED Hash and Crypto Engine"
+ depends on ASPEED_AST2600
+ imply SHA_HW_ACCEL
+ imply SHA_PROG_HW_ACCEL
+ imply SHA512
+ imply SHA512_ALGO
+ imply CMD_HASH
+ help
+ Select this option to enable a driver for using the SHA engine in
+ the ASPEED BMC SoCs.
+
+ Enabling this allows the use of SHA operations in hardware without requiring the
+ SHA software implementations, saving code size.
+
+ Due to hardware limitations it cannot be used with a FIT placed in SPI
+ FLASH. Data can only be hashed if it is in SDRAM, making this relevant
+ for MMC and network boot only.
+
endmenu
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index efbd1d3fca05..ac93b1295954 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -4,5 +4,6 @@
# http://www.samsung.com
obj-$(CONFIG_EXYNOS_ACE_SHA) += ace_sha.o
+obj-$(CONFIG_ASPEED_HACE) += aspeed_hace.o
obj-y += rsa_mod_exp/
obj-y += fsl/
diff --git a/drivers/crypto/aspeed_hace.c b/drivers/crypto/aspeed_hace.c
new file mode 100644
index 000000000000..941c1555fe5c
--- /dev/null
+++ b/drivers/crypto/aspeed_hace.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// (C) Copyright ASPEED Technology Inc.
+// Copyright 2021 IBM Corp.
+
+#include <common.h>
+#include <clk.h>
+
+#include <log.h>
+#include <asm/io.h>
+#include <malloc.h>
+#include <hash.h>
+
+#include <dm/device.h>
+#include <dm/fdtaddr.h>
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/iopoll.h>
+
+#define ASPEED_HACE_STS 0x1C
+#define HACE_RSA_ISR BIT(13)
+#define HACE_CRYPTO_ISR BIT(12)
+#define HACE_HASH_ISR BIT(9)
+#define HACE_RSA_BUSY BIT(2)
+#define HACE_CRYPTO_BUSY BIT(1)
+#define HACE_HASH_BUSY BIT(0)
+#define ASPEED_HACE_HASH_SRC 0x20
+#define ASPEED_HACE_HASH_DIGEST_BUFF 0x24
+#define ASPEED_HACE_HASH_KEY_BUFF 0x28
+#define ASPEED_HACE_HASH_DATA_LEN 0x2C
+#define HACE_SG_LAST BIT(31)
+#define ASPEED_HACE_HASH_CMD 0x30
+#define HACE_SHA_BE_EN BIT(3)
+#define HACE_MD5_LE_EN BIT(2)
+#define HACE_ALGO_MD5 0
+#define HACE_ALGO_SHA1 BIT(5)
+#define HACE_ALGO_SHA224 BIT(6)
+#define HACE_ALGO_SHA256 (BIT(4) | BIT(6))
+#define HACE_ALGO_SHA512 (BIT(5) | BIT(6))
+#define HACE_ALGO_SHA384 (BIT(5) | BIT(6) | BIT(10))
+#define HACE_SG_EN BIT(18)
+
+#define ASPEED_MAX_SG 32
+
+struct aspeed_sg {
+ u32 len;
+ u32 addr;
+};
+
+struct aspeed_hash_ctx {
+ u32 method;
+ u32 digest_size;
+ u32 len;
+ u32 count;
+ struct aspeed_sg list[ASPEED_MAX_SG]; /* Must be 8 byte aligned */
+};
+
+struct aspeed_hace {
+ struct clk clk;
+};
+
+static phys_addr_t base;
+
+static int aspeed_hace_wait_completion(u32 reg, u32 flag, int timeout_us)
+{
+ u32 val;
+
+ return readl_poll_timeout(reg, val, (val & flag) == flag, timeout_us);
+}
+
+static int digest_object(const void *src, unsigned int length, void *digest, u32 method)
+{
+ if (!((u32)src & BIT(31))) {
+ debug("HACE src out of bounds: can only copy from SDRAM\n");
+ return -EINVAL;
+ }
+
+ if ((u32)digest & 0x7) {
+ debug("HACE dest alignment incorrect: %p\n", digest);
+ return -EINVAL;
+ }
+
+ if (readl(base + ASPEED_HACE_STS) & HACE_HASH_BUSY) {
+ debug("HACE error: engine busy\n");
+ return -EBUSY;
+ }
+
+ /* Clear pending completion status */
+ writel(HACE_HASH_ISR, base + ASPEED_HACE_STS);
+
+ writel((u32)src, base + ASPEED_HACE_HASH_SRC);
+ writel((u32)digest, base + ASPEED_HACE_HASH_DIGEST_BUFF);
+ writel(length, base + ASPEED_HACE_HASH_DATA_LEN);
+ writel(HACE_SHA_BE_EN | method, base + ASPEED_HACE_HASH_CMD);
+
+ /* SHA512 hashing appears to have a througput of about 12MB/s */
+ return aspeed_hace_wait_completion(base + ASPEED_HACE_STS,
+ HACE_HASH_ISR,
+ 1000 + (length >> 3));
+}
+
+void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
+ unsigned char *pout, unsigned int chunk_size)
+{
+ int rc;
+
+ rc = digest_object(pbuf, buf_len, pout, HACE_ALGO_SHA1);
+ if (rc)
+ debug("HACE failure: %d\n", rc);
+}
+
+void hw_sha256(const unsigned char *pbuf, unsigned int buf_len,
+ unsigned char *pout, unsigned int chunk_size)
+{
+ int rc;
+
+ rc = digest_object(pbuf, buf_len, pout, HACE_ALGO_SHA256);
+ if (rc)
+ debug("HACE failure: %d\n", rc);
+}
+
+void hw_sha512(const unsigned char *pbuf, unsigned int buf_len,
+ unsigned char *pout, unsigned int chunk_size)
+{
+ int rc;
+
+ rc = digest_object(pbuf, buf_len, pout, HACE_ALGO_SHA512);
+ if (rc)
+ debug("HACE failure: %d\n", rc);
+}
+
+int hw_sha_init(struct hash_algo *algo, void **ctxp)
+{
+ struct aspeed_hash_ctx *ctx;
+ u32 method;
+
+ if (!strcmp(algo->name, "sha1"))
+ method = HACE_ALGO_SHA1;
+ else if (!strcmp(algo->name, "sha256"))
+ method = HACE_ALGO_SHA256;
+ else if (!strcmp(algo->name, "sha512"))
+ method = HACE_ALGO_SHA512;
+ else
+ return -ENOTSUPP;
+ }
+
+ ctx = memalign(8, sizeof(*ctx));
+ if (!ctx) {
+ debug("HACE error: Cannot allocate memory for context\n");
+ return -ENOMEM;
+ }
+
+ memset(ctx, '\0', sizeof(*ctx));
+
+ if (((uintptr_t)ctx->list & 0x3) != 0) {
+ printf("HACE error: Invalid alignment for input data\n");
+ return -EINVAL;
+ }
+
+ ctx->method = method | HACE_SG_EN;
+ ctx->digest_size = algo->digest_size;
+ *ctxp = ctx;
+
+ return 0;
+}
+
+int hw_sha_update(struct hash_algo *algo, void *hash_ctx, const void *buf,
+ unsigned int size, int is_last)
+{
+ struct aspeed_hash_ctx *ctx = hash_ctx;
+ struct aspeed_sg *sg = &ctx->list[ctx->count];
+
+ if (ctx->count >= ARRAY_SIZE(ctx->list)) {
+ debug("HACE error: Reached maximum number of hash segments\n");
+ free(ctx);
+ return -EINVAL;
+ }
+
+ sg->addr = (u32)buf;
+ sg->len = size;
+ if (is_last)
+ sg->len |= HACE_SG_LAST;
+
+ ctx->count++;
+ ctx->len += size;
+
+ return 0;
+}
+
+int hw_sha_finish(struct hash_algo *algo, void *hash_ctx, void *dest_buf, int size)
+{
+ struct aspeed_hash_ctx *ctx = hash_ctx;
+ int rc;
+
+ if (size < ctx->digest_size) {
+ debug("HACE error: insufficient size on destination buffer\n");
+ free(ctx);
+ return -EINVAL;
+ }
+
+ rc = digest_object(ctx->list, ctx->len, dest_buf, ctx->method);
+ if (rc)
+ debug("HACE Scatter-Gather failure\n");
+
+ free(ctx);
+
+ return rc;
+}
+
+static int aspeed_hace_probe(struct udevice *dev)
+{
+ struct aspeed_hace *hace = dev_get_priv(dev);
+ int ret;
+
+ ret = clk_get_by_index(dev, 0, &hace->clk);
+ if (ret < 0) {
+ debug("Can't get clock for %s: %d\n", dev->name, ret);
+ return ret;
+ }
+
+ ret = clk_enable(&hace->clk);
+ if (ret) {
+ debug("Failed to enable fsi clock (%d)\n", ret);
+ return ret;
+ }
+
+ /* As the crypto code does not pass us any driver state */
+ base = devfdt_get_addr(dev);
+
+ return ret;
+}
+
+static int aspeed_hace_remove(struct udevice *dev)
+{
+ struct aspeed_hace *hace = dev_get_priv(dev);
+
+ clk_disable(&hace->clk);
+
+ return 0;
+}
+
+static const struct udevice_id aspeed_hace_ids[] = {
+ { .compatible = "aspeed,ast2600-hace" },
+ { }
+};
+
+U_BOOT_DRIVER(aspeed_hace) = {
+ .name = "aspeed_hace",
+ .id = UCLASS_MISC,
+ .of_match = aspeed_hace_ids,
+ .probe = aspeed_hace_probe,
+ .remove = aspeed_hace_remove,
+ .priv_auto = sizeof(struct aspeed_hace),
+};
--
2.30.2
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