GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-19 21:21:09 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

rapidio: add DMA engine support for RIO data transfers

Browse source 
Adds DMA Engine framework support into RapidIO subsystem.

Uses DMA Engine DMA_SLAVE interface to generate data transfers to/from
remote RapidIO target devices.

Introduces RapidIO-specific wrapper for prep_slave_sg() interface with an
extra parameter to pass target specific information.

Uses scatterlist to describe local data buffer.  Address flat data buffer
on a remote side.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Acked-by: Vinod Koul <vinod.koul@linux.intel.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine 2012-05-31 16:26:38 -07:00 • committed by Linus Torvalds
parent ce2d52cc13
commit e42d98ebe7
5 changed files with 163 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

47
include/linux/rio.h
View file

@ -20,6 +20,9 @@
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/rio_regs.h>
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
#include <linux/dmaengine.h>
#endif
#define RIO_NO_HOPCOUNT -1
#define RIO_INVALID_DESTID 0xffff
@ -254,6 +257,9 @@ struct rio_mport {
u32 phys_efptr;
unsigned char name[40];
void *priv; /* Master port private data */
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
struct dma_device dma;
#endif
};
/**
@ -395,6 +401,47 @@ union rio_pw_msg {
u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
};
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
/**
* enum rio_write_type - RIO write transaction types used in DMA transfers
*
* Note: RapidIO specification defines write (NWRITE) and
* write-with-response (NWRITE_R) data transfer operations.
* Existing DMA controllers that service RapidIO may use one of these operations
* for entire data transfer or their combination with only the last data packet
* requires response.
*/
enum rio_write_type {
RDW_DEFAULT, /* default method used by DMA driver */
RDW_ALL_NWRITE, /* all packets use NWRITE */
RDW_ALL_NWRITE_R, /* all packets use NWRITE_R */
RDW_LAST_NWRITE_R, /* last packet uses NWRITE_R, others - NWRITE */
};
struct rio_dma_ext {
u16 destid;
u64 rio_addr; /* low 64-bits of 66-bit RapidIO address */
u8 rio_addr_u; /* upper 2-bits of 66-bit RapidIO address */
enum rio_write_type wr_type; /* preferred RIO write operation type */
};
struct rio_dma_data {
/* Local data (as scatterlist) */
struct scatterlist *sg; /* I/O scatter list */
unsigned int sg_len; /* size of scatter list */
/* Remote device address (flat buffer) */
u64 rio_addr; /* low 64-bits of 66-bit RapidIO address */
u8 rio_addr_u; /* upper 2-bits of 66-bit RapidIO address */
enum rio_write_type wr_type; /* preferred RIO write operation type */
};
static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
{
return container_of(ddev, struct rio_mport, dma);
}
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
/* Architecture and hardware-specific functions */
extern int rio_register_mport(struct rio_mport *);
extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);