meson/gxl: Add support for SHA256 DMA engine
In order to configure and boot SCP, BL31 has to compute and send
the SHA-256 of the firmware data via scpi. Luckily Amlogic GXL SOC
has a DMA facility that could be used to offload SHA-256
computations. This adds basic support of this hardware SHA-256
engine.
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
diff --git a/include/drivers/meson/gxl/crypto/sha_dma.h b/include/drivers/meson/gxl/crypto/sha_dma.h
new file mode 100644
index 0000000..52129a6
--- /dev/null
+++ b/include/drivers/meson/gxl/crypto/sha_dma.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2019, Remi Pommarel <repk@triplefau.lt>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef SHA_DMA_H
+#define SHA_DMA_H
+
+#define SHA256_HASHSZ 32
+#define SHA256_BLOCKSZ 0x40
+
+enum ASD_MODE {
+ ASM_INVAL,
+ ASM_SHA256,
+ ASM_SHA224,
+};
+
+struct asd_ctx {
+ uint8_t digest[SHA256_HASHSZ];
+ uint8_t block[SHA256_BLOCKSZ];
+ size_t blocksz;
+ enum ASD_MODE mode;
+ uint8_t started;
+};
+
+static inline void asd_sha_init(struct asd_ctx *ctx, enum ASD_MODE mode)
+{
+ ctx->started = 0;
+ ctx->mode = mode;
+ ctx->blocksz = 0;
+}
+
+void asd_sha_update(struct asd_ctx *ctx, void *data, size_t len);
+void asd_sha_finalize(struct asd_ctx *ctx);
+
+#endif