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Blackfin arch: Add DMA API to set curr descriptor address 

This API is necessary for DMA descriptor array mode.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Sonic Zhang 2007-08-05 16:14:58 +08:00 committed by Bryan Wu
parent 2cbfe10743
commit 8a26ac7043
2 changed files with 15 additions and 1 deletions
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15
arch/blackfin/kernel/bfin_dma_5xx.c
View File

@ -270,10 +270,23 @@ void set_dma_next_desc_addr(unsigned int channel, unsigned long addr)
dma_ch[channel].regs->next_desc_ptr = addr;
SSYNC();
pr_debug("set_dma_start_addr() : END\n");
pr_debug("set_dma_next_desc_addr() : END\n");
}
EXPORT_SYMBOL(set_dma_next_desc_addr);
void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr)
{
pr_debug("set_dma_curr_desc_addr() : BEGIN \n");
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
&& channel < MAX_BLACKFIN_DMA_CHANNEL));
dma_ch[channel].regs->curr_desc_ptr = addr;
SSYNC();
pr_debug("set_dma_curr_desc_addr() : END\n");
}
EXPORT_SYMBOL(set_dma_curr_desc_addr);
void set_dma_x_count(unsigned int channel, unsigned short x_count)
{
BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE

1
include/asm-blackfin/dma.h
View File

@ -152,6 +152,7 @@ struct dma_channel {
/* functions to set register mode */
void set_dma_start_addr(unsigned int channel, unsigned long addr);
void set_dma_next_desc_addr(unsigned int channel, unsigned long addr);
void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr);
void set_dma_x_count(unsigned int channel, unsigned short x_count);
void set_dma_x_modify(unsigned int channel, short x_modify);
void set_dma_y_count(unsigned int channel, unsigned short y_count);