ssi: Implemented CS behaviour

Added default CS behaviour for SSI slaves. SSI devices can set a property
to enable CS behaviour which will create a GPIO on the device which is the
CS. Tristating of the bus on SSI transfers is implemented.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Acked-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/ssi-sd.c b/hw/ssi-sd.c
index b519bdb..cbbc645 100644
--- a/hw/ssi-sd.c
+++ b/hw/ssi-sd.c
@@ -197,6 +197,7 @@ static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val)
 
 static void ssi_sd_save(QEMUFile *f, void *opaque)
 {
+    SSISlave *ss = SSI_SLAVE(opaque);
     ssi_sd_state *s = (ssi_sd_state *)opaque;
     int i;
 
@@ -209,10 +210,13 @@ static void ssi_sd_save(QEMUFile *f, void *opaque)
     qemu_put_be32(f, s->arglen);
     qemu_put_be32(f, s->response_pos);
     qemu_put_be32(f, s->stopping);
+
+    qemu_put_be32(f, ss->cs);
 }
 
 static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id)
 {
+    SSISlave *ss = SSI_SLAVE(opaque);
     ssi_sd_state *s = (ssi_sd_state *)opaque;
     int i;
 
@@ -229,6 +233,8 @@ static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id)
     s->response_pos = qemu_get_be32(f);
     s->stopping = qemu_get_be32(f);
 
+    ss->cs = qemu_get_be32(f);
+
     return 0;
 }