[PATCH v4 4/4] hw/misc/aspeed_hace: Fix boot issue in the Crypto Manager Self Test

[Jamin Lin via <qemu-devel@nongnu.org>]

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 to resolve the boot issue in the Crypto Manager
Self Test.

Introduce a new "use_crypt_workaround" class attribute and set it to true in
the AST2700 HACE model to enable this workaround by default for AST2700.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 include/hw/misc/aspeed_hace.h |  1 +
 hw/misc/aspeed_hace.c         | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/hw/misc/aspeed_hace.h b/include/hw/misc/aspeed_hace.h
index d13fd3da07..5d4aa19cfe 100644
--- a/include/hw/misc/aspeed_hace.h
+++ b/include/hw/misc/aspeed_hace.h
@@ -50,6 +50,7 @@ struct AspeedHACEClass {
     uint32_t dest_mask;
     uint32_t key_mask;
     uint32_t hash_mask;
+    bool raise_crypt_interrupt_workaround;
 };
 
 #endif /* ASPEED_HACE_H */
diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
index 86422cb3be..32a5dbded3 100644
--- a/hw/misc/aspeed_hace.c
+++ b/hw/misc/aspeed_hace.c
@@ -59,6 +59,7 @@
 /* Other cmd bits */
 #define  HASH_IRQ_EN                    BIT(9)
 #define  HASH_SG_EN                     BIT(18)
+#define  CRYPT_IRQ_EN                   BIT(12)
 /* Scatter-gather data list */
 #define SG_LIST_LEN_SIZE                4
 #define SG_LIST_LEN_MASK                0x0FFFFFFF
@@ -343,6 +344,15 @@ static void aspeed_hace_write(void *opaque, hwaddr addr, uint64_t data,
                 qemu_irq_lower(s->irq);
             }
         }
+        if (ahc->raise_crypt_interrupt_workaround) {
+            if (data & CRYPT_IRQ) {
+                data &= ~CRYPT_IRQ;
+
+                if (s->regs[addr] & CRYPT_IRQ) {
+                    qemu_irq_lower(s->irq);
+                }
+            }
+        }
         break;
     case R_HASH_SRC:
         data &= ahc->src_mask;
@@ -388,6 +398,12 @@ static void aspeed_hace_write(void *opaque, hwaddr addr, uint64_t data,
     case R_CRYPT_CMD:
         qemu_log_mask(LOG_UNIMP, "%s: Crypt commands not implemented\n",
                        __func__);
+        if (ahc->raise_crypt_interrupt_workaround) {
+            s->regs[R_STATUS] |= CRYPT_IRQ;
+            if (data & CRYPT_IRQ_EN) {
+                qemu_irq_raise(s->irq);
+            }
+        }
         break;
     default:
         break;
@@ -563,6 +579,13 @@ static void aspeed_ast2700_hace_class_init(ObjectClass *klass, void *data)
     ahc->dest_mask = 0x7FFFFFF8;
     ahc->key_mask = 0x7FFFFFF8;
     ahc->hash_mask = 0x00147FFF;
+
+    /*
+     * 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.
+     */
+    ahc->raise_crypt_interrupt_workaround = true;
 }
 
 static const TypeInfo aspeed_ast2700_hace_info = {
-- 
2.34.1