/* Abort all chained DMA transfers. After all transfers have been
* aborted and the DMA controller is idle, the completion routines for
* any aborted transfers will be called in sequence. The DMA
* controller may not be idle after this routine completes, because
* the completion routines might start new transfers.
*/
static void omap24xxcam_dma_abort(struct omap24xxcam_dma *dma, u32 csr)
{
unsigned long flags;
int dmach, i, free_dmach;
dma_callback_t callback;
void *arg;
spin_lock_irqsave(&dma->lock, flags);
/* stop any DMA transfers in progress */
dmach = (dma->next_dmach + dma->free_dmach) % NUM_CAMDMA_CHANNELS;
for (i = 0; i < NUM_CAMDMA_CHANNELS; i++) {
omap24xxcam_dmahw_abort_ch(dma->base, dmach);
dmach = (dmach + 1) % NUM_CAMDMA_CHANNELS;
}
/* We have to be careful here because the callback routine
* might start a new DMA transfer, and we only want to abort
* transfers that were started before this routine was called.
*/
free_dmach = dma->free_dmach;
while ((dma->free_dmach < NUM_CAMDMA_CHANNELS) &&
(free_dmach < NUM_CAMDMA_CHANNELS)) {
dmach = (dma->next_dmach + dma->free_dmach)
% NUM_CAMDMA_CHANNELS;
callback = dma->ch_state[dmach].callback;
arg = dma->ch_state[dmach].arg;
dma->free_dmach++;
free_dmach++;
if (callback) {
/* leave interrupts disabled during callback */
spin_unlock(&dma->lock);
(*callback) (dma, csr, arg);
spin_lock(&dma->lock);
}
}
spin_unlock_irqrestore(&dma->lock, flags);
}
static void omap24xxcam_dma_abort(struct omap24xxcam_dma *dma, u32 csr)
{
unsigned long flags;
int dmach, i, free_dmach;
dma_callback_t callback;
void *arg;
spin_lock_irqsave(&dma->lock, flags);
dmach = (dma->next_dmach + dma->free_dmach) % NUM_CAMDMA_CHANNELS;
for (i = 0; i < NUM_CAMDMA_CHANNELS; i++) {
omap24xxcam_dmahw_abort_ch(dma->base, dmach);
dmach = (dmach + 1) % NUM_CAMDMA_CHANNELS;
}
free_dmach = dma->free_dmach;
while ((dma->free_dmach < NUM_CAMDMA_CHANNELS) &&
(free_dmach < NUM_CAMDMA_CHANNELS)) {
dmach = (dma->next_dmach + dma->free_dmach)
% NUM_CAMDMA_CHANNELS;
callback = dma->ch_state[dmach].callback;
arg = dma->ch_state[dmach].arg;
dma->free_dmach++;
free_dmach++;
if (callback) {
spin_unlock(&dma->lock);
(*callback) (dma, csr, arg);
spin_lock(&dma->lock);
}
}
spin_unlock_irqrestore(&dma->lock, flags);
}
