int set_dma_callback(unsigned int channel, dma_interrupt_t callback, void *data)
{
int ret_irq = 0;
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_BLACKFIN_DMA_CHANNEL));
if (callback != NULL) {
int ret_val;
ret_irq = channel2irq(channel);
dma_ch[channel].data = data;
ret_val =
request_irq(ret_irq, (void *)callback, IRQF_DISABLED,
dma_ch[channel].device_id, data);
if (ret_val) {
printk(KERN_NOTICE
"Request irq in DMA engine failed.\n");
return -EPERM;
}
dma_ch[channel].irq_callback = callback;
}
return 0;
}
void dma_disable_irq(unsigned int channel)
{
int ret_irq;
pr_debug("dma_disable_irq() : BEGIN \n");
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_BLACKFIN_DMA_CHANNEL));
ret_irq = channel2irq(channel);
disable_irq(ret_irq);
}
int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data)
{
int ret;
unsigned int irq;
BUG_ON(channel >= MAX_DMA_CHANNELS || !callback ||
!atomic_read(&dma_ch[channel].chan_status));
irq = channel2irq(channel);
ret = request_irq(irq, callback, 0, dma_ch[channel].device_id, data);
if (ret)
return ret;
dma_ch[channel].irq = irq;
dma_ch[channel].data = data;
return 0;
}
int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data)
{
BUG_ON(channel >= MAX_DMA_CHANNELS ||
dma_ch[channel].chan_status == DMA_CHANNEL_FREE);
if (callback != NULL) {
int ret;
unsigned int irq = channel2irq(channel);
ret = request_irq(irq, callback, IRQF_DISABLED,
dma_ch[channel].device_id, data);
if (ret)
return ret;
dma_ch[channel].irq = irq;
dma_ch[channel].data = data;
}
return 0;
}
void free_dma(unsigned int channel)
{
int ret_irq;
pr_debug("freedma() : BEGIN \n");
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_BLACKFIN_DMA_CHANNEL));
/* Halt the DMA */
disable_dma(channel);
clear_dma_buffer(channel);
if (dma_ch[channel].irq_callback != NULL) {
ret_irq = channel2irq(channel);
free_irq(ret_irq, dma_ch[channel].data);
}
/* Clear the DMA Variable in the Channel */
mutex_lock(&(dma_ch[channel].dmalock));
dma_ch[channel].chan_status = DMA_CHANNEL_FREE;
mutex_unlock(&(dma_ch[channel].dmalock));
pr_debug("freedma() : END \n");
}
