hw/misc/aspeed_hace: Add support for source, digest, key buffer 64 bit addresses

According to the AST2700 design, the data source address is 64-bit, with
R_HASH_SRC_HI storing bits [63:32] and R_HASH_SRC storing bits [31:0].
Similarly, the digest address is 64-bit, with R_HASH_DIGEST_HI storing bits
[63:32] and R_HASH_DIGEST storing bits [31:0]. The HMAC key buffer address is also
64-bit, with R_HASH_KEY_BUFF_HI storing bits [63:32] and R_HASH_KEY_BUFF storing
bits [31:0].

The AST2700 supports a maximum DRAM size of 8 GB, with a DRAM addressable range
from 0x0_0000_0000 to 0x1_FFFF_FFFF. Since this range fits within 34 bits, only
bits [33:0] are needed to store the DRAM offset. To optimize address storage,
the high physical address bits [1:0] of the source, digest and key buffer
addresses are stored as dram_offset bits [33:32].

To achieve this, a src_hi_mask with a mask value of 0x3 is introduced, ensuring
that src_addr_hi consists of bits [1:0]. The final src_addr is computed as
(src_addr_hi[1:0] << 32) | src_addr[31:0], representing the DRAM offset within
bits [33:0].

Similarly, a dest_hi_mask with a mask value of 0x3 is introduced to ensure that
dest_addr_hi consists of bits [1:0]. The final dest_addr is calculated as
(dest_addr_hi[1:0] << 32) | dest_addr[31:0], representing the DRAM offset within
bits [33:0].

Additionally, a key_hi_mask with a mask value of 0x3 is introduced to ensure
that key_buf_addr_hi consists of bits [1:0]. The final key_buf_addr is
determined as (key_buf_addr_hi[1:0] << 32) | key_buf_addr[31:0], representing
the DRAM offset within bits [33:0].

This approach eliminates the need to reduce the high part of the DRAM physical
address for DMA operations. Previously, this was calculated as
(high physical address bits [7:0] - 4), since the DRAM start address is
0x4_00000000, making the high part address [7:0] - 4.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250515081008.583578-14-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

2 files changed, 33 insertions, 1 deletions

diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
index fef63eb..d58645c 100644
--- a/hw/misc/aspeed_hace.c
+++ b/hw/misc/aspeed_hace.c
@@ -30,6 +30,9 @@
 #define R_HASH_DIGEST   (0x24 / 4)
 #define R_HASH_KEY_BUFF (0x28 / 4)
 #define R_HASH_SRC_LEN  (0x2c / 4)
+#define R_HASH_SRC_HI       (0x90 / 4)
+#define R_HASH_DIGEST_HI    (0x94 / 4)
+#define R_HASH_KEY_BUFF_HI  (0x98 / 4)
 
 #define R_HASH_CMD      (0x30 / 4)
 /* Hash algorithm selection */
@@ -473,6 +476,15 @@ static void aspeed_hace_write(void *opaque, hwaddr addr, uint64_t data,
             }
         }
         break;
+    case R_HASH_SRC_HI:
+        data &= ahc->src_hi_mask;
+        break;
+    case R_HASH_DIGEST_HI:
+        data &= ahc->dest_hi_mask;
+        break;
+    case R_HASH_KEY_BUFF_HI:
+        data &= ahc->key_hi_mask;
+        break;
     default:
         break;
     }
@@ -656,13 +668,30 @@ static void aspeed_ast2700_hace_class_init(ObjectClass *klass, const void *data)
 
     dc->desc = "AST2700 Hash and Crypto Engine";
 
-    ahc->nr_regs = 0x64 >> 2;
+    ahc->nr_regs = 0x9C >> 2;
     ahc->src_mask = 0x7FFFFFFF;
     ahc->dest_mask = 0x7FFFFFF8;
     ahc->key_mask = 0x7FFFFFF8;
     ahc->hash_mask = 0x00147FFF;
 
     /*
+     * The AST2700 supports a maximum DRAM size of 8 GB, with a DRAM
+     * addressable range from 0x0_0000_0000 to 0x1_FFFF_FFFF. Since this range
+     * fits within 34 bits, only bits [33:0] are needed to store the DRAM
+     * offset. To optimize address storage, the high physical address bits
+     * [1:0] of the source, digest and key buffer addresses are stored as
+     * dram_offset bits [33:32].
+     *
+     * This approach eliminates the need to reduce the high part of the DRAM
+     * physical address for DMA operations. Previously, this was calculated as
+     * (high physical address bits [7:0] - 4), since the DRAM start address is
+     * 0x4_00000000, making the high part address [7:0] - 4.
+     */
+    ahc->src_hi_mask = 0x00000003;
+    ahc->dest_hi_mask = 0x00000003;
+    ahc->key_hi_mask = 0x00000003;
+
+    /*
      * Currently, it does not support the CRYPT command. Instead, it only
      * sends an interrupt to notify the firmware that the crypt command
      * has completed. It is a temporary workaround.
diff --git a/include/hw/misc/aspeed_hace.h b/include/hw/misc/aspeed_hace.h
index f30d606..9945b61 100644
--- a/include/hw/misc/aspeed_hace.h
+++ b/include/hw/misc/aspeed_hace.h
@@ -50,6 +50,9 @@ struct AspeedHACEClass {
     uint32_t hash_mask;
     uint64_t nr_regs;
     bool raise_crypt_interrupt_workaround;
+    uint32_t src_hi_mask;
+    uint32_t dest_hi_mask;
+    uint32_t key_hi_mask;
 };
 
 #endif /* ASPEED_HACE_H */