static void davinci_spi_dma_tx_callback(unsigned lch, u16 ch_status, void *data)
{
struct spi_device *spi = (struct spi_device *)data;
struct davinci_spi *davinci_spi;
struct davinci_spi_dma *davinci_spi_dma;
struct davinci_spi_platform_data *pdata;
davinci_spi = spi_master_get_devdata(spi->master);
davinci_spi_dma = &(davinci_spi->dma_channels[spi->chip_select]);
pdata = davinci_spi->pdata;
if (ch_status == DMA_COMPLETE)
edma_stop(davinci_spi_dma->dma_tx_channel);
else
edma_clean_channel(davinci_spi_dma->dma_tx_channel);
complete(&davinci_spi_dma->dma_tx_completion);
/* We must disable the DMA TX request */
davinci_spi_set_dma_req(spi, 0);
}
/* release_channel() must be called with the edma_mutex held */
static void release_channel(int chan)
{
int localChan;
int i;
/*
* The non-LSP_210 EDMA interface returns a "magic" value that represents
* the controller number and channel number muxed together in one UInt32.
* This module doesn't yet support a controller other than 0, however, this
* function needs to accommodate being called with a controller > 0 since
* it's called to release a channel on a controller > 0 when the
* REQUESTDMA ioctl() receives a controller > 0 that it can't handle and
* needs to clean up after itself.
*/
/*
* In order to not be dependent on the LSP #defines, we need to
* translate our EDMA interface's #defines to the LSP ones.
*/
#if defined(LSP_210)
localChan = chan;
if (chan >= EDMA_QDMA0 && chan <= EDMA_QDMA7) {
__D(" release_channel: translating QDMA channel %d to LSP namespace ...\n", chan);
localChan = EDMA_QDMA_CHANNEL_0 + (chan - EDMA_QDMA0);
}
for (i = 0; i < channels[localChan].nParam; i++) {
__D(" release_channel: freeing channel %d...\n", localChan + i);
davinci_free_dma(localChan + i);
}
INIT_LIST_HEAD(&channels[localChan].users);
channels[localChan].nParam = 0;
channels[localChan].isParam = 0;
#else /* defined(LSP_210) */
localChan = EDMA_CHAN_SLOT(chan);
if (localChan >= EDMA_QDMA0 && localChan <= EDMA_QDMA7) {
__E(" release_channel: QDMA is not supported: chan %d\n", chan);
return;
}
for (i = 0; i < channels[localChan].nParam; i++) {
if (channels[localChan].isParam) {
__D(" release_channel: calling edma_free_slot(%d)...\n",
chan + i);
edma_free_slot(chan + i);
}
else {
__D(" release_channel: calling edma_free_channel(%d)...\n",
chan + i);
edma_clean_channel(chan + i);
edma_free_channel(chan + i);
}
}
if (EDMA_CTLR(chan) == 0) {
INIT_LIST_HEAD(&channels[localChan].users);
channels[localChan].nParam = 0;
channels[localChan].isParam = 0;
}
#endif /* defined(LSP_210) */
}
