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Message-Id: <11840607111926-git-send-email-wei.zhang@freescale.com>
Date: Tue, 10 Jul 2007 17:45:11 +0800
From: Zhang Wei <wei.zhang@...escale.com>
To: akpm@...ux-foundation.org, paulus@...ba.org,
galak@...nel.crashing.org
Cc: linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
Zhang Wei <wei.zhang@...escale.com>
Subject: [PATCH 3/4] Extend the DMA-engine API.
Add channel wait queue and transfer callback dma_xfer_callback().
If the DMA controller and driver support interrupt, when the
transfer is finished, it will wakeup the wait queue
and call the callback function of the channel.
Add dma_async_raw_xfer() to API and device_raw_xfer() to struct dma_device
for RAW physical address DMA transfer, which will be used at transfer
between I/O address and memory address.
Signed-off-by: Zhang Wei <wei.zhang@...escale.com>
---
include/linux/dmaengine.h | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c94d8f1..d9dfc57 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -28,6 +28,7 @@
#include <linux/kref.h>
#include <linux/completion.h>
#include <linux/rcupdate.h>
+#include <linux/wait.h>
/**
* enum dma_event - resource PNP/power managment events
@@ -108,6 +109,8 @@ struct dma_chan {
struct list_head client_node;
struct list_head device_node;
struct dma_chan_percpu *local;
+
+ wait_queue_head_t wait_q;
};
void dma_chan_cleanup(struct kref *kref);
@@ -138,6 +141,12 @@ static inline void dma_chan_put(struct dma_chan *chan)
typedef void (*dma_event_callback) (struct dma_client *client,
struct dma_chan *chan, enum dma_event event);
+/*
+ * typedef dma_xfer_callback
+ * - function pointer to a DMA transfer callback when finished
+ */
+typedef void (*dma_xfer_callback) (struct dma_chan *chan, void *data);
+
/**
* struct dma_client - info on the entity making use of DMA services
* @event_callback: func ptr to call when something happens
@@ -187,6 +196,9 @@ struct dma_device {
int (*device_alloc_chan_resources)(struct dma_chan *chan);
void (*device_free_chan_resources)(struct dma_chan *chan);
+ dma_cookie_t (*device_raw_xfer)(struct dma_chan *chan,
+ dma_addr_t dest, dma_addr_t src, size_t len,
+ dma_xfer_callback cb, void *data);
dma_cookie_t (*device_memcpy_buf_to_buf)(struct dma_chan *chan,
void *dest, void *src, size_t len);
dma_cookie_t (*device_memcpy_buf_to_pg)(struct dma_chan *chan,
@@ -209,6 +221,29 @@ void dma_async_client_chan_request(struct dma_client *client,
unsigned int number);
/**
+ * dma_async_raw_xfer - transfor data between physical addresses with callback
+ * @chan: DMA channel to be used
+ * @dest: destination address (physical)
+ * @src: source address (physical)
+ * @len: length
+ */
+static inline dma_cookie_t dma_async_raw_xfer(struct dma_chan *chan,
+ dma_addr_t dest, dma_addr_t src, size_t len,
+ dma_xfer_callback cb, void *data)
+{
+ int cpu = get_cpu();
+ per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+ per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+ put_cpu();
+
+ if (chan->device->device_raw_xfer)
+ return chan->device->device_raw_xfer(chan, dest, src, len,
+ cb, data);
+ else
+ return -EPERM;
+}
+
+/**
* dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses
* @chan: DMA channel to offload copy to
* @dest: destination address (virtual)
--
1.5.1
-
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