1 files changed, 120 insertions, 7 deletions

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 20ea12c86fd0..5204f018931b 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -40,11 +40,13 @@ typedef s32 dma_cookie_t;
  * enum dma_status - DMA transaction status
  * @DMA_SUCCESS: transaction completed successfully
  * @DMA_IN_PROGRESS: transaction not yet processed
+ * @DMA_PAUSED: transaction is paused
  * @DMA_ERROR: transaction failed
  */
 enum dma_status {
         DMA_SUCCESS,
         DMA_IN_PROGRESS,
+        DMA_PAUSED,
         DMA_ERROR,
 };
 
@@ -107,6 +109,19 @@ enum dma_ctrl_flags {
 };
 
 /**
+ * enum dma_ctrl_cmd - DMA operations that can optionally be exercised
+ * on a running channel.
+ * @DMA_TERMINATE_ALL: terminate all ongoing transfers
+ * @DMA_PAUSE: pause ongoing transfers
+ * @DMA_RESUME: resume paused transfer
+ */
+enum dma_ctrl_cmd {
+        DMA_TERMINATE_ALL,
+        DMA_PAUSE,
+        DMA_RESUME,
+};
+
+/**
  * enum sum_check_bits - bit position of pq_check_flags
  */
 enum sum_check_bits {
@@ -230,9 +245,84 @@ struct dma_async_tx_descriptor {
         dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx);
         dma_async_tx_callback callback;
         void *callback_param;
+#ifndef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH
         struct dma_async_tx_descriptor *next;
         struct dma_async_tx_descriptor *parent;
         spinlock_t lock;
+#endif
+};
+
+#ifdef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH
+static inline void txd_lock(struct dma_async_tx_descriptor *txd)
+{
+}
+static inline void txd_unlock(struct dma_async_tx_descriptor *txd)
+{
+}
+static inline void txd_chain(struct dma_async_tx_descriptor *txd, struct dma_async_tx_descriptor *next)
+{
+        BUG();
+}
+static inline void txd_clear_parent(struct dma_async_tx_descriptor *txd)
+{
+}
+static inline void txd_clear_next(struct dma_async_tx_descriptor *txd)
+{
+}
+static inline struct dma_async_tx_descriptor *txd_next(struct dma_async_tx_descriptor *txd)
+{
+        return NULL;
+}
+static inline struct dma_async_tx_descriptor *txd_parent(struct dma_async_tx_descriptor *txd)
+{
+        return NULL;
+}
+
+#else
+static inline void txd_lock(struct dma_async_tx_descriptor *txd)
+{
+        spin_lock_bh(&txd->lock);
+}
+static inline void txd_unlock(struct dma_async_tx_descriptor *txd)
+{
+        spin_unlock_bh(&txd->lock);
+}
+static inline void txd_chain(struct dma_async_tx_descriptor *txd, struct dma_async_tx_descriptor *next)
+{
+        txd->next = next;
+        next->parent = txd;
+}
+static inline void txd_clear_parent(struct dma_async_tx_descriptor *txd)
+{
+        txd->parent = NULL;
+}
+static inline void txd_clear_next(struct dma_async_tx_descriptor *txd)
+{
+        txd->next = NULL;
+}
+static inline struct dma_async_tx_descriptor *txd_parent(struct dma_async_tx_descriptor *txd)
+{
+        return txd->parent;
+}
+static inline struct dma_async_tx_descriptor *txd_next(struct dma_async_tx_descriptor *txd)
+{
+        return txd->next;
+}
+#endif
+
+/**
+ * struct dma_tx_state - filled in to report the status of
+ * a transfer.
+ * @last: last completed DMA cookie
+ * @used: last issued DMA cookie (i.e. the one in progress)
+ * @residue: the remaining number of bytes left to transmit
+ *      on the selected transfer for states DMA_IN_PROGRESS and
+ *      DMA_PAUSED if this is implemented in the driver, else 0
+ */
+struct dma_tx_state {
+        dma_cookie_t last;
+        dma_cookie_t used;
+        u32 residue;
 };
 
 /**
@@ -261,8 +351,12 @@ struct dma_async_tx_descriptor {
  * @device_prep_dma_memset: prepares a memset operation
  * @device_prep_dma_interrupt: prepares an end of chain interrupt operation
  * @device_prep_slave_sg: prepares a slave dma operation
- * @device_terminate_all: terminate all pending operations
- * @device_is_tx_complete: poll for transaction completion
+ * @device_control: manipulate all pending operations on a channel, returns
+ *      zero or error code
+ * @device_tx_status: poll for transaction completion, the optional
+ *      txstate parameter can be supplied with a pointer to get a
+ *      struct with auxilary transfer status information, otherwise the call
+ *      will just return a simple status code
  * @device_issue_pending: push pending transactions to hardware
  */
 struct dma_device {
@@ -313,11 +407,12 @@ struct dma_device {
                 struct dma_chan *chan, struct scatterlist *sgl,
                 unsigned int sg_len, enum dma_data_direction direction,
                 unsigned long flags);
-        void (*device_terminate_all)(struct dma_chan *chan);
+        int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+                unsigned long arg);
 
-        enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
-                        dma_cookie_t cookie, dma_cookie_t *last,
-                        dma_cookie_t *used);
+        enum dma_status (*device_tx_status)(struct dma_chan *chan,
+                                            dma_cookie_t cookie,
+                                            struct dma_tx_state *txstate);
         void (*device_issue_pending)(struct dma_chan *chan);
 };
 
@@ -558,7 +653,15 @@ static inline void dma_async_issue_pending(struct dma_chan *chan)
 static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
         dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used)
 {
-        return chan->device->device_is_tx_complete(chan, cookie, last, used);
+        struct dma_tx_state state;
+        enum dma_status status;
+
+        status = chan->device->device_tx_status(chan, cookie, &state);
+        if (last)
+                *last = state.last;
+        if (used)
+                *used = state.used;
+        return status;
 }
 
 #define dma_async_memcpy_complete(chan, cookie, last, used)\
@@ -586,6 +689,16 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
         return DMA_IN_PROGRESS;
 }
 
+static inline void
+dma_set_tx_state(struct dma_tx_state *st, dma_cookie_t last, dma_cookie_t used, u32 residue)
+{
+        if (st) {
+                st->last = last;
+                st->used = used;
+                st->residue = residue;
+        }
+}
+
 enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie);
 #ifdef CONFIG_DMA_ENGINE
 enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);