[PATCH v7 06/10] hw/ssi/xilinx_spi: Make device endianness configurable

[Philippe Mathieu-Daudé]

Replace the DEVICE_NATIVE_ENDIAN MemoryRegionOps by a pair
of DEVICE_LITTLE_ENDIAN / DEVICE_BIG_ENDIAN.
Add the "little-endian" property to select the device
endianness, defaulting to little endian.
Set the proper endianness on the single machine using the
device.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/microblaze/petalogix_ml605_mmu.c |  1 +
 hw/ssi/xilinx_spi.c                 | 32 +++++++++++++++++++++--------
 2 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/hw/microblaze/petalogix_ml605_mmu.c 
b/hw/microblaze/petalogix_ml605_mmu.c
index 490640e9428..b34edf13796 100644
--- a/hw/microblaze/petalogix_ml605_mmu.c
+++ b/hw/microblaze/petalogix_ml605_mmu.c
@@ -175,6 +175,7 @@ petalogix_ml605_init(MachineState *machine)
         SSIBus *spi;
 
         dev = qdev_new("xlnx.xps-spi");
+        qdev_prop_set_enum(dev, "endianness", ENDIAN_MODE_LITTLE);
         qdev_prop_set_uint8(dev, "num-ss-bits", NUM_SPI_FLASHES);
         busdev = SYS_BUS_DEVICE(dev);
         sysbus_realize_and_unref(busdev, &error_fatal);
diff --git a/hw/ssi/xilinx_spi.c b/hw/ssi/xilinx_spi.c
index fd1ff12eb1d..be5baa6b350 100644
--- a/hw/ssi/xilinx_spi.c
+++ b/hw/ssi/xilinx_spi.c
@@ -25,6 +25,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qapi/error.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
 #include "qemu/module.h"
@@ -32,6 +33,7 @@
 
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
+#include "hw/qdev-properties-system.h"
 #include "hw/ssi/ssi.h"
 #include "qom/object.h"
 
@@ -83,6 +85,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(XilinxSPI, XILINX_SPI)
 struct XilinxSPI {
     SysBusDevice parent_obj;
 
+    EndianMode model_endianness;
     MemoryRegion mmio;
 
     qemu_irq irq;
@@ -313,14 +316,17 @@ done:
     xlx_spi_update_irq(s);
 }
 
-static const MemoryRegionOps spi_ops = {
-    .read = spi_read,
-    .write = spi_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
-    .valid = {
-        .min_access_size = 4,
-        .max_access_size = 4
-    }
+static const MemoryRegionOps spi_ops[2] = {
+    [0 ... 1] = {
+        .read = spi_read,
+        .write = spi_write,
+        .valid = {
+            .min_access_size = 4,
+            .max_access_size = 4,
+        },
+    },
+    [0].endianness = DEVICE_LITTLE_ENDIAN,
+    [1].endianness = DEVICE_BIG_ENDIAN,
 };
 
 static void xilinx_spi_realize(DeviceState *dev, Error **errp)
@@ -329,6 +335,12 @@ static void xilinx_spi_realize(DeviceState *dev, Error 
**errp)
     XilinxSPI *s = XILINX_SPI(dev);
     int i;
 
+    if (s->model_endianness == ENDIAN_MODE_UNSPECIFIED) {
+        error_setg(errp, TYPE_XILINX_SPI " property 'endianness'"
+                         " must be set to 'big' or 'little'");
+        return;
+    }
+
     DB_PRINT("\n");
 
     s->spi = ssi_create_bus(dev, "spi");
@@ -339,7 +351,8 @@ static void xilinx_spi_realize(DeviceState *dev, Error 
**errp)
         sysbus_init_irq(sbd, &s->cs_lines[i]);
     }
 
-    memory_region_init_io(&s->mmio, OBJECT(s), &spi_ops, s,
+    memory_region_init_io(&s->mmio, OBJECT(s),
+                          &spi_ops[s->model_endianness == ENDIAN_MODE_BIG], s,
                           "xilinx-spi", R_MAX * 4);
     sysbus_init_mmio(sbd, &s->mmio);
 
@@ -362,6 +375,7 @@ static const VMStateDescription vmstate_xilinx_spi = {
 };
 
 static const Property xilinx_spi_properties[] = {
+    DEFINE_PROP_ENDIAN_NODEFAULT("endianness", XilinxSPI, model_endianness),
     DEFINE_PROP_UINT8("num-ss-bits", XilinxSPI, num_cs, 1),
 };
 
-- 
2.47.1