diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2018-11-22 13:11:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-26 16:59:48 +0100 |
| commit | 2513eb0dd7ba8a8766b9642075c19ac5f2d5463b (patch) | |
| tree | 034c9a02290754acfcddd8341eb5249015c32221 /drivers/misc/mei/dma-ring.c | |
| parent | c55bf542e91b5c9156d57fd0461aa257b7d20858 (diff) | |
mei: hw: add dma ring control block
The DMA ring control block contains write and read
indices for host and device circular buffers.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/dma-ring.c')
| -rw-r--r-- | drivers/misc/mei/dma-ring.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/misc/mei/dma-ring.c b/drivers/misc/mei/dma-ring.c index 56f4c0882a20..b73d5ab54070 100644 --- a/drivers/misc/mei/dma-ring.c +++ b/drivers/misc/mei/dma-ring.c @@ -97,3 +97,23 @@ bool mei_dma_ring_is_allocated(struct mei_device *dev) { return !!dev->dr_dscr[DMA_DSCR_HOST].vaddr; } + +static inline +struct hbm_dma_ring_ctrl *mei_dma_ring_ctrl(struct mei_device *dev) +{ + return (struct hbm_dma_ring_ctrl *)dev->dr_dscr[DMA_DSCR_CTRL].vaddr; +} + +/** + * mei_dma_ring_reset() - reset the dma control block + * @dev: mei device + */ +void mei_dma_ring_reset(struct mei_device *dev) +{ + struct hbm_dma_ring_ctrl *ctrl = mei_dma_ring_ctrl(dev); + + if (!ctrl) + return; + + memset(ctrl, 0, sizeof(*ctrl)); +} |