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ssi: Implemented CS behaviour

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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>
This commit is contained in:
Peter A. G. Crosthwaite 2012-07-24 12:23:22 +10:00 • committed by Peter Crosthwaite
parent b4a76e84f4
commit 6653095331
9 changed files with 118 additions and 16 deletions
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6
hw/ssi-sd.c
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@ -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;
}