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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: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Simon Glass 2015-03-25 12:21:53 -06:00
parent e23eb614a4
commit 2c03c4633b
2 changed files with 20 additions and 2 deletions
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19
drivers/core/device.c
View File

@ -164,6 +164,21 @@ int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
-1, devp); -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) int device_probe_child(struct udevice *dev, void *parent_priv)
{ {
struct driver *drv; struct driver *drv;
@ -182,7 +197,7 @@ int device_probe_child(struct udevice *dev, void *parent_priv)
/* Allocate private data if requested */ /* Allocate private data if requested */
if (drv->priv_auto_alloc_size) { 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) { if (!dev->priv) {
ret = -ENOMEM; ret = -ENOMEM;
goto fail; goto fail;
@ -206,7 +221,7 @@ int device_probe_child(struct udevice *dev, void *parent_priv)
per_child_auto_alloc_size; per_child_auto_alloc_size;
} }
if (size) { if (size) {
dev->parent_priv = calloc(1, size); dev->parent_priv = alloc_priv(size, drv->flags);
if (!dev->parent_priv) { if (!dev->parent_priv) {
ret = -ENOMEM; ret = -ENOMEM;
goto fail; goto fail;

3
include/dm/device.h
View File

@ -30,6 +30,9 @@ struct driver_info;
/* DM is responsible for allocating and freeing parent_platdata */ /* DM is responsible for allocating and freeing parent_platdata */
#define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3) #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 * struct udevice - An instance of a driver
* *