PPC: dbdma: macio: Add DMA callback

We need to know when the IDE core starts a DMA transfer. Add a notifier
function so we have the chance to start transmitting data.

Signed-off-by: Alexander Graf <agraf@suse.de>

hw/ide/macio.c

@@ -359,11 +359,50 @@ static void macio_ide_reset(DeviceState *dev)
     ide_bus_reset(&d->bus);
 }
 
+static int ide_nop(IDEDMA *dma)
+{
+    return 0;
+}
+
+static int ide_nop_int(IDEDMA *dma, int x)
+{
+    return 0;
+}
+
+static void ide_nop_restart(void *opaque, int x, RunState y)
+{
+}
+
+static void ide_dbdma_start(IDEDMA *dma, IDEState *s,
+                            BlockDriverCompletionFunc *cb)
+{
+    MACIOIDEState *m = container_of(dma, MACIOIDEState, dma);
+
+    MACIO_DPRINTF("\n");
+    DBDMA_kick(m->dbdma);
+}
+
+static const IDEDMAOps dbdma_ops = {
+    .start_dma      = ide_dbdma_start,
+    .start_transfer = ide_nop,
+    .prepare_buf    = ide_nop_int,
+    .rw_buf         = ide_nop_int,
+    .set_unit       = ide_nop_int,
+    .add_status     = ide_nop_int,
+    .set_inactive   = ide_nop,
+    .restart_cb     = ide_nop_restart,
+    .reset          = ide_nop,
+};
+
 static void macio_ide_realizefn(DeviceState *dev, Error **errp)
 {
     MACIOIDEState *s = MACIO_IDE(dev);
 
     ide_init2(&s->bus, s->irq);
+
+    /* Register DMA callbacks */
+    s->dma.ops = &dbdma_ops;
+    s->bus.dma = &s->dma;
 }
 
 static void macio_ide_initfn(Object *obj)
@@ -414,6 +453,7 @@ void macio_ide_init_drives(MACIOIDEState *s, DriveInfo **hd_table)
 
 void macio_ide_register_dma(MACIOIDEState *s, void *dbdma, int channel)
 {
+    s->dbdma = dbdma;
     DBDMA_register_channel(dbdma, channel, s->dma_irq,
                            pmac_ide_transfer, pmac_ide_flush, s);
 }

hw/ppc/mac.h

@@ -131,6 +131,8 @@ typedef struct MACIOIDEState {
     MemoryRegion mem;
     IDEBus bus;
     BlockDriverAIOCB *aiocb;
+    IDEDMA dma;
+    void *dbdma;
 } MACIOIDEState;
 
 void macio_ide_init_drives(MACIOIDEState *ide, DriveInfo **hd_table);