dw_dmac.c File Reference

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "dw_dmac_regs.h"
#include "dmaengine.h"

Go to the source code of this file.

Macros
#define	DWC_DEFAULT_CTLLO(_chan)
#define	NR_DESCS_PER_CHANNEL   64

Functions
dma_addr_t	dw_dma_get_src_addr (struct dma_chan *chan)
	EXPORT_SYMBOL (dw_dma_get_src_addr)
dma_addr_t	dw_dma_get_dst_addr (struct dma_chan *chan)
	EXPORT_SYMBOL (dw_dma_get_dst_addr)
int	dw_dma_cyclic_start (struct dma_chan *chan)
	EXPORT_SYMBOL (dw_dma_cyclic_start)
void	dw_dma_cyclic_stop (struct dma_chan *chan)
	EXPORT_SYMBOL (dw_dma_cyclic_stop)
struct dw_cyclic_desc *	dw_dma_cyclic_prep (struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, size_t period_len, enum dma_transfer_direction direction)
	EXPORT_SYMBOL (dw_dma_cyclic_prep)
void	dw_dma_cyclic_free (struct dma_chan *chan)
	EXPORT_SYMBOL (dw_dma_cyclic_free)
	subsys_initcall (dw_init)
	module_exit (dw_exit)
	MODULE_LICENSE ("GPL v2")
	MODULE_DESCRIPTION ("Synopsys DesignWare DMA Controller driver")
	MODULE_AUTHOR ("Haavard Skinnemoen (Atmel)")
	MODULE_AUTHOR ("Viresh Kumar <[email protected]>")

Macro Definition Documentation

#define DWC_DEFAULT_CTLLO

(

_chan

)

Value:

({              \
		struct dw_dma_slave *__slave = (_chan->private);  \
		struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \
		struct dma_slave_config   *_sconfig = &_dwc->dma_sconfig; \
        int _dms = dwc_get_dms(__slave);        \
        int _sms = dwc_get_sms(__slave);        \
		u8 _smsize = __slave ? _sconfig->src_maxburst :   \
            DW_DMA_MSIZE_16;            \
		u8 _dmsize = __slave ? _sconfig->dst_maxburst :   \
            DW_DMA_MSIZE_16;            \
                                \
        (DWC_CTLL_DST_MSIZE(_dmsize)            \
         | DWC_CTLL_SRC_MSIZE(_smsize)          \
         | DWC_CTLL_LLP_D_EN                \
         | DWC_CTLL_LLP_S_EN                \
         | DWC_CTLL_DMS(_dms)               \
         | DWC_CTLL_SMS(_sms));             \
    })

Definition at line 49 of file dw_dmac.c.

#define NR_DESCS_PER_CHANNEL   64

Definition at line 73 of file dw_dmac.c.

Function Documentation

void dw_dma_cyclic_free

(

struct dma_chan *

chan

)

dw_dma_cyclic_free - free a prepared cyclic DMA transfer : the DMA channel to free

Definition at line 1413 of file dw_dmac.c.

struct dw_cyclic_desc* dw_dma_cyclic_prep ( struct dma_chan *  chan, dma_addr_t  buf_addr, size_t  buf_len, size_t  period_len, enum dma_transfer_direction  direction  )

read

dw_dma_cyclic_prep - prepare the cyclic DMA transfer : the DMA channel to prepare : physical DMA address where the buffer starts : total number of bytes for the entire buffer : number of bytes for each period : transfer direction, to or from device

Must be called before trying to start the transfer. Returns a valid struct dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful.

Definition at line 1260 of file dw_dmac.c.

int dw_dma_cyclic_start

(

struct dma_chan *

chan

)

dw_dma_cyclic_start - start the cyclic DMA transfer : the DMA channel to start

Must be called with soft interrupts disabled. Returns zero on success or -errno on failure.

Definition at line 1191 of file dw_dmac.c.

void dw_dma_cyclic_stop

(

struct dma_chan *

chan

)

dw_dma_cyclic_stop - stop the cyclic DMA transfer : the DMA channel to stop

Must be called with soft interrupts disabled.

Definition at line 1235 of file dw_dmac.c.

dma_addr_t dw_dma_get_dst_addr ( struct dma_chan *  chan )

inline

Definition at line 519 of file dw_dmac.c.

dma_addr_t dw_dma_get_src_addr ( struct dma_chan *  chan )

inline

Definition at line 512 of file dw_dmac.c.

EXPORT_SYMBOL

(

dw_dma_get_src_addr

)

EXPORT_SYMBOL

(

dw_dma_get_dst_addr

)

EXPORT_SYMBOL

(

dw_dma_cyclic_start

)

EXPORT_SYMBOL

(

dw_dma_cyclic_stop

)

EXPORT_SYMBOL

(

dw_dma_cyclic_prep

)

EXPORT_SYMBOL

(

dw_dma_cyclic_free

)

MODULE_AUTHOR

(

"Haavard Skinnemoen (Atmel)"

)

MODULE_AUTHOR

(

"Viresh Kumar <[email protected]>"

)

MODULE_DESCRIPTION

(

"Synopsys DesignWare DMA Controller driver"

)

module_exit

(

dw_exit

)

MODULE_LICENSE

(

"GPL v2"

)

subsys_initcall

(

dw_init

)