Commit 2c03c463 authored by Simon Glass's avatar Simon Glass
Browse files

dm: core: Support allocating driver-private data for DMA



Some driver want to put DMA buffers in their private data. Add a flag
to tell driver model to align driver-private data to a cache boundary so
that DMA will work correctly in this case.
Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
Reviewed-by: default avatarMarek Vasut <marex@denx.de>
parent e23eb614
......@@ -164,6 +164,21 @@ int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
-1, devp);
}
static void *alloc_priv(int size, uint flags)
{
void *priv;
if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
priv = memalign(ARCH_DMA_MINALIGN, size);
if (priv)
memset(priv, '\0', size);
} else {
priv = calloc(1, size);
}
return priv;
}
int device_probe_child(struct udevice *dev, void *parent_priv)
{
struct driver *drv;
......@@ -182,7 +197,7 @@ int device_probe_child(struct udevice *dev, void *parent_priv)
/* Allocate private data if requested */
if (drv->priv_auto_alloc_size) {
dev->priv = calloc(1, drv->priv_auto_alloc_size);
dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
if (!dev->priv) {
ret = -ENOMEM;
goto fail;
......@@ -206,7 +221,7 @@ int device_probe_child(struct udevice *dev, void *parent_priv)
per_child_auto_alloc_size;
}
if (size) {
dev->parent_priv = calloc(1, size);
dev->parent_priv = alloc_priv(size, drv->flags);
if (!dev->parent_priv) {
ret = -ENOMEM;
goto fail;
......
......@@ -30,6 +30,9 @@ struct driver_info;
/* DM is responsible for allocating and freeing parent_platdata */
#define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
/* Allocate driver private data on a DMA boundary */
#define DM_FLAG_ALLOC_PRIV_DMA (1 << 4)
/**
* struct udevice - An instance of a driver
*
......
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