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Blackfin arch: lookup channel2irq() only once 

Add irq to struct dma_channel lookup channel2irq() only once,
since channel2irq() is fairly large on some Blackfin derivatives.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Michael Hennerich 2008-10-28 18:19:29 +08:00 committed by Bryan Wu
parent 3529e0414b
commit a2ba8b1998
2 changed files with 7 additions and 18 deletions
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1
arch/blackfin/include/asm/dma.h
View File

@ -140,6 +140,7 @@ struct dma_channel {
struct dma_register *regs;
struct dmasg *sg; /* large mode descriptor */
unsigned int ctrl_num; /* controller number */
unsigned int irq;
dma_interrupt_t irq_callback;
void *data;
unsigned int dma_enable_flag;

24
arch/blackfin/kernel/bfin_dma_5xx.c
View File

@ -139,19 +139,16 @@ EXPORT_SYMBOL(request_dma);
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].irq = channel2irq(channel);
dma_ch[channel].data = data;
ret_val =
request_irq(ret_irq, (void *)callback, IRQF_DISABLED,
request_irq(dma_ch[channel].irq, callback, IRQF_DISABLED,
dma_ch[channel].device_id, data);
if (ret_val) {
printk(KERN_NOTICE
@ -166,7 +163,6 @@ EXPORT_SYMBOL(set_dma_callback);
void free_dma(unsigned int channel)
{
int ret_irq;
pr_debug("freedma() : BEGIN \n");
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
@ -176,10 +172,8 @@ void free_dma(unsigned int channel)
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);
}
if (dma_ch[channel].irq_callback != NULL)
free_irq(dma_ch[channel].irq, dma_ch[channel].data);
/* Clear the DMA Variable in the Channel */
mutex_lock(&(dma_ch[channel].dmalock));
@ -192,27 +186,21 @@ EXPORT_SYMBOL(free_dma);
void dma_enable_irq(unsigned int channel)
{
int ret_irq;
pr_debug("dma_enable_irq() : BEGIN \n");
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_BLACKFIN_DMA_CHANNEL));
ret_irq = channel2irq(channel);
enable_irq(ret_irq);
enable_irq(dma_ch[channel].irq);
}
EXPORT_SYMBOL(dma_enable_irq);
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);
disable_irq(dma_ch[channel].irq);
}
EXPORT_SYMBOL(dma_disable_irq);