Add extended version of the bounce_buffer_start(), which permits passing in
a custom alignment checker function for the buffer. This is useful e.g. on
systems with various DMA restrictions and where the checker function might
be more complex than a simple CPU cache alignment check.
Signed-off-by: Marek Vasut <marek.vasut+rene...@gmail.com>
Cc: Daniel Schwierzeck <daniel.schwierz...@gmail.com>
Cc: Masahiro Yamada <yamada.masah...@socionext.com>
Cc: Peng Fan <peng....@nxp.com>
Cc: Simon Glass <s...@chromium.org>
Cc: Tom Rini <tr...@konsulko.com>
---
V2: No change
---
common/bouncebuf.c | 20 +++++++++++++++-----
include/bouncebuf.h | 15 +++++++++++++++
2 files changed, 30 insertions(+), 5 deletions(-)
diff --git a/common/bouncebuf.c b/common/bouncebuf.c
index 614eb36c78..0ace152b98 100644
--- a/common/bouncebuf.c
+++ b/common/bouncebuf.c
@@ -31,17 +31,19 @@ static int addr_aligned(struct bounce_buffer *state)
return 1;
}
-int bounce_buffer_start(struct bounce_buffer *state, void *data,
- size_t len, unsigned int flags)
+int bounce_buffer_start_extalign(struct bounce_buffer *state, void *data,
+ size_t len, unsigned int flags,
+ size_t alignment,
+ int (*addr_is_aligned)(struct bounce_buffer
*state))
{
state->user_buffer = data;
state->bounce_buffer = data;
state->len = len;
- state->len_aligned = roundup(len, ARCH_DMA_MINALIGN);
+ state->len_aligned = roundup(len, alignment);
state->flags = flags;
- if (!addr_aligned(state)) {
- state->bounce_buffer = memalign(ARCH_DMA_MINALIGN,
+ if (!addr_is_aligned(state)) {
+ state->bounce_buffer = memalign(alignment,
state->len_aligned);
if (!state->bounce_buffer)
return -ENOMEM;
@@ -62,6 +64,14 @@ int bounce_buffer_start(struct bounce_buffer *state, void
*data,
return 0;
}
+int bounce_buffer_start(struct bounce_buffer *state, void *data,
+ size_t len, unsigned int flags)
+{
+ return bounce_buffer_start_extalign(state, data, len, flags,
+ ARCH_DMA_MINALIGN,
+ addr_aligned);
+}
+
int bounce_buffer_stop(struct bounce_buffer *state)
{
if (state->flags & GEN_BB_WRITE) {
diff --git a/include/bouncebuf.h b/include/bouncebuf.h
index fd9b0f3b28..7427bd12e2 100644
--- a/include/bouncebuf.h
+++ b/include/bouncebuf.h
@@ -62,6 +62,21 @@ struct bounce_buffer {
*/
int bounce_buffer_start(struct bounce_buffer *state, void *data,
size_t len, unsigned int flags);
+
+/**
+ * bounce_buffer_start() -- Start the bounce buffer session with external
align check function
+ * state: stores state passed between bounce_buffer_{start,stop}
+ * data: pointer to buffer to be aligned
+ * len: length of the buffer
+ * flags: flags describing the transaction, see above.
+ * alignment: alignment of the newly allocated bounce buffer
+ * addr_is_aligned: function for checking the alignment instead of the default
one
+ */
+int bounce_buffer_start_extalign(struct bounce_buffer *state, void *data,
+ size_t len, unsigned int flags,
+ size_t alignment,
+ int (*addr_is_aligned)(struct bounce_buffer
*state));
+
/**
* bounce_buffer_stop() -- Finish the bounce buffer session
* state: stores state passed between bounce_buffer_{start,stop}
--
2.25.1
