[PATCH v4 3/4] hw/ssi: ibex_spi: fixup/add rw1c functionality

[Wilfred Mallawa <wilfred.mallawa@opensource.wdc.com>]

From: Wilfred Mallawa <wilfred.mallawa@wdc.com>

This patch adds the `rw1c` functionality to the respective
registers. The status fields are cleared when the respective
field is set.

Signed-off-by: Wilfred Mallawa <wilfred.mallawa@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 hw/ssi/ibex_spi_host.c         | 34 ++++++++++++++++++++++++++++++++--
 include/hw/ssi/ibex_spi_host.h |  4 ++--
 2 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/hw/ssi/ibex_spi_host.c b/hw/ssi/ibex_spi_host.c
index d52b193a1a..40d401ad47 100644
--- a/hw/ssi/ibex_spi_host.c
+++ b/hw/ssi/ibex_spi_host.c
@@ -352,7 +352,17 @@ static void ibex_spi_host_write(void *opaque, hwaddr addr,
 
     switch (addr) {
     /* Skipping any R/O registers */
-    case IBEX_SPI_HOST_INTR_STATE...IBEX_SPI_HOST_INTR_ENABLE:
+    case IBEX_SPI_HOST_INTR_STATE:
+        /* rw1c status register */
+        if (FIELD_EX32(val32, INTR_STATE, ERROR)) {
+            data = FIELD_DP32(data, INTR_STATE, ERROR, 0);
+        }
+        if (FIELD_EX32(val32, INTR_STATE, SPI_EVENT)) {
+            data = FIELD_DP32(data, INTR_STATE, SPI_EVENT, 0);
+        }
+        s->regs[addr] = data;
+        break;
+    case IBEX_SPI_HOST_INTR_ENABLE:
         s->regs[addr] = val32;
         break;
     case IBEX_SPI_HOST_INTR_TEST:
@@ -495,7 +505,27 @@ static void ibex_spi_host_write(void *opaque, hwaddr addr,
      *  When an error occurs, the corresponding bit must be cleared
      *  here before issuing any further commands
      */
-        s->regs[addr] = val32;
+        status = s->regs[addr];
+        /* rw1c status register */
+        if (FIELD_EX32(val32, ERROR_STATUS, CMDBUSY)) {
+            status = FIELD_DP32(status, ERROR_STATUS, CMDBUSY, 0);
+        }
+        if (FIELD_EX32(val32, ERROR_STATUS, OVERFLOW)) {
+            status = FIELD_DP32(status, ERROR_STATUS, OVERFLOW, 0);
+        }
+        if (FIELD_EX32(val32, ERROR_STATUS, UNDERFLOW)) {
+            status = FIELD_DP32(status, ERROR_STATUS, UNDERFLOW, 0);
+        }
+        if (FIELD_EX32(val32, ERROR_STATUS, CMDINVAL)) {
+            status = FIELD_DP32(status, ERROR_STATUS, CMDINVAL, 0);
+        }
+        if (FIELD_EX32(val32, ERROR_STATUS, CSIDINVAL)) {
+            status = FIELD_DP32(status, ERROR_STATUS, CSIDINVAL, 0);
+        }
+        if (FIELD_EX32(val32, ERROR_STATUS, ACCESSINVAL)) {
+            status = FIELD_DP32(status, ERROR_STATUS, ACCESSINVAL, 0);
+        }
+        s->regs[addr] = status;
         break;
     case IBEX_SPI_HOST_EVENT_ENABLE:
     /* Controls which classes of SPI events raise an interrupt. */
diff --git a/include/hw/ssi/ibex_spi_host.h b/include/hw/ssi/ibex_spi_host.h
index 3fedcb6805..1f6d077766 100644
--- a/include/hw/ssi/ibex_spi_host.h
+++ b/include/hw/ssi/ibex_spi_host.h
@@ -40,7 +40,7 @@
     OBJECT_CHECK(IbexSPIHostState, (obj), TYPE_IBEX_SPI_HOST)
 
 /* SPI Registers */
-#define IBEX_SPI_HOST_INTR_STATE         (0x00 / 4)  /* rw */
+#define IBEX_SPI_HOST_INTR_STATE         (0x00 / 4)  /* rw1c */
 #define IBEX_SPI_HOST_INTR_ENABLE        (0x04 / 4)  /* rw */
 #define IBEX_SPI_HOST_INTR_TEST          (0x08 / 4)  /* wo */
 #define IBEX_SPI_HOST_ALERT_TEST         (0x0c / 4)  /* wo */
@@ -54,7 +54,7 @@
 #define IBEX_SPI_HOST_TXDATA             (0x28 / 4)
 
 #define IBEX_SPI_HOST_ERROR_ENABLE       (0x2c / 4)  /* rw */
-#define IBEX_SPI_HOST_ERROR_STATUS       (0x30 / 4)  /* rw */
+#define IBEX_SPI_HOST_ERROR_STATUS       (0x30 / 4)  /* rw1c */
 #define IBEX_SPI_HOST_EVENT_ENABLE       (0x34 / 4)  /* rw */
 
 /* FIFO Len in Bytes */
-- 
2.37.2