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Commit 8a26ac70 authored by Sonic Zhang's avatar Sonic Zhang Committed by Bryan Wu
Browse files

Blackfin arch: Add DMA API to set curr descriptor address 



This API is necessary for DMA descriptor array mode.

Signed-off-by: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
parent 2cbfe107

arch/blackfin/kernel/bfin_dma_5xx.c

+14 −1
Original line number Diff line number Diff line
@@ -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

include/asm-blackfin/dma.h

+1 −0
Original line number Diff line number Diff line
@@ -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);