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 <s...@chromium.org>
---
Changes in v2: None
drivers/core/device.c | 19 +++++++++++++++++--
include/dm/device.h | 3 +++
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/core/device.c b/drivers/core/device.c
index 7483405..1ca5d1c 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -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;
diff --git a/include/dm/device.h b/include/dm/device.h
index 6980954..f27b34b 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -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
*
--
2.2.0.rc0.207.ga3a616c
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