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| 1 | /* |
| 2 | * The contents of this file are private to DMA engine drivers, and is not |
| 3 | * part of the API to be used by DMA engine users. |
| 4 | */ |
| 5 | #ifndef DMAENGINE_H |
| 6 | #define DMAENGINE_H |
| 7 | |
| 8 | #include <linux/bug.h> |
| 9 | #include <linux/dmaengine.h> |
| 10 | |
| 11 | /** |
| 12 | * dma_cookie_init - initialize the cookies for a DMA channel |
| 13 | * @chan: dma channel to initialize |
| 14 | */ |
| 15 | static inline void dma_cookie_init(struct dma_chan *chan) |
| 16 | { |
| 17 | chan->cookie = DMA_MIN_COOKIE; |
| 18 | chan->completed_cookie = DMA_MIN_COOKIE; |
| 19 | } |
| 20 | |
| 21 | /** |
| 22 | * dma_cookie_assign - assign a DMA engine cookie to the descriptor |
| 23 | * @tx: descriptor needing cookie |
| 24 | * |
| 25 | * Assign a unique non-zero per-channel cookie to the descriptor. |
| 26 | * Note: caller is expected to hold a lock to prevent concurrency. |
| 27 | */ |
| 28 | static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx) |
| 29 | { |
| 30 | struct dma_chan *chan = tx->chan; |
| 31 | dma_cookie_t cookie; |
| 32 | |
| 33 | cookie = chan->cookie + 1; |
| 34 | if (cookie < DMA_MIN_COOKIE) |
| 35 | cookie = DMA_MIN_COOKIE; |
| 36 | tx->cookie = chan->cookie = cookie; |
| 37 | |
| 38 | return cookie; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * dma_cookie_complete - complete a descriptor |
| 43 | * @tx: descriptor to complete |
| 44 | * |
| 45 | * Mark this descriptor complete by updating the channels completed |
| 46 | * cookie marker. Zero the descriptors cookie to prevent accidental |
| 47 | * repeated completions. |
| 48 | * |
| 49 | * Note: caller is expected to hold a lock to prevent concurrency. |
| 50 | */ |
| 51 | static inline void dma_cookie_complete(struct dma_async_tx_descriptor *tx) |
| 52 | { |
| 53 | BUG_ON(tx->cookie < DMA_MIN_COOKIE); |
| 54 | tx->chan->completed_cookie = tx->cookie; |
| 55 | tx->cookie = 0; |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * dma_cookie_status - report cookie status |
| 60 | * @chan: dma channel |
| 61 | * @cookie: cookie we are interested in |
| 62 | * @state: dma_tx_state structure to return last/used cookies |
| 63 | * |
| 64 | * Report the status of the cookie, filling in the state structure if |
| 65 | * non-NULL. No locking is required. |
| 66 | */ |
| 67 | static inline enum dma_status dma_cookie_status(struct dma_chan *chan, |
| 68 | dma_cookie_t cookie, struct dma_tx_state *state) |
| 69 | { |
| 70 | dma_cookie_t used, complete; |
| 71 | |
| 72 | used = chan->cookie; |
| 73 | complete = chan->completed_cookie; |
| 74 | barrier(); |
| 75 | if (state) { |
| 76 | state->last = complete; |
| 77 | state->used = used; |
| 78 | state->residue = 0; |
| 79 | } |
| 80 | return dma_async_is_complete(cookie, complete, used); |
| 81 | } |
| 82 | |
| 83 | static inline void dma_set_residue(struct dma_tx_state *state, u32 residue) |
| 84 | { |
| 85 | if (state) |
| 86 | state->residue = residue; |
| 87 | } |
| 88 | |
| 89 | #endif |
| 90 |
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