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Commit 864e5e36 authored by JD Zheng's avatar JD Zheng Committed by Olof Johansson
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ARM: bcmring: remove unused DMA map code 

Remove BCMRING DMA map code which is no longer used.

This also fixes a build error with dma.c introduced by
bfcd2ea6.
Signed-off-by: default avatarJiandong Zheng <jdzheng@broadcom.com>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 4a81220a
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arch/arm/mach-bcmring/dma.c
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arch/arm/mach-bcmring/include/mach/dma.h
View file @ 864e5e36
......@@ -26,15 +26,9 @@
/* ---- Include Files ---------------------------------------------------- */
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/semaphore.h>
#include <csp/dmacHw.h>
#include <mach/timer.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
/* ---- Constants and Types ---------------------------------------------- */
......@@ -111,78 +105,6 @@ typedef struct {
} DMA_DescriptorRing_t;
/****************************************************************************
*
* The DMA_MemType_t and DMA_MemMap_t are helper structures used to setup
* DMA chains from a variety of memory sources.
*
*****************************************************************************/
#define DMA_MEM_MAP_MIN_SIZE 4096 /* Pages less than this size are better */
/* off not being DMA'd. */
typedef enum {
DMA_MEM_TYPE_NONE, /* Not a valid setting */
DMA_MEM_TYPE_VMALLOC, /* Memory came from vmalloc call */
DMA_MEM_TYPE_KMALLOC, /* Memory came from kmalloc call */
DMA_MEM_TYPE_DMA, /* Memory came from dma_alloc_xxx call */
DMA_MEM_TYPE_USER, /* Memory came from user space. */
} DMA_MemType_t;
/* A segment represents a physically and virtually contiguous chunk of memory. */
/* i.e. each segment can be DMA'd */
/* A user of the DMA code will add memory regions. Each region may need to be */
/* represented by one or more segments. */
typedef struct {
void *virtAddr; /* Virtual address used for this segment */
dma_addr_t physAddr; /* Physical address this segment maps to */
size_t numBytes; /* Size of the segment, in bytes */
} DMA_Segment_t;
/* A region represents a virtually contiguous chunk of memory, which may be */
/* made up of multiple segments. */
typedef struct {
DMA_MemType_t memType;
void *virtAddr;
size_t numBytes;
/* Each region (virtually contiguous) consists of one or more segments. Each */
/* segment is virtually and physically contiguous. */
int numSegmentsUsed;
int numSegmentsAllocated;
DMA_Segment_t *segment;
/* When a region corresponds to user memory, we need to lock all of the pages */
/* down before we can figure out the physical addresses. The lockedPage array contains */
/* the pages that were locked, and which subsequently need to be unlocked once the */
/* memory is unmapped. */
unsigned numLockedPages;
struct page **lockedPages;
} DMA_Region_t;
typedef struct {
int inUse; /* Is this mapping currently being used? */
struct semaphore lock; /* Acquired when using this structure */
enum dma_data_direction dir; /* Direction this transfer is intended for */
/* In the event that we're mapping user memory, we need to know which task */
/* the memory is for, so that we can obtain the correct mm locks. */
struct task_struct *userTask;
int numRegionsUsed;
int numRegionsAllocated;
DMA_Region_t *region;
} DMA_MemMap_t;
/****************************************************************************
*
* The DMA_DeviceAttribute_t contains information which describes a
......@@ -568,124 +490,6 @@ int dma_alloc_double_dst_descriptors(DMA_Handle_t handle, /* DMA Handle */
size_t numBytes /* Number of bytes in each destination buffer */
);
/****************************************************************************/
/**
* Initializes a DMA_MemMap_t data structure
*/
/****************************************************************************/
int dma_init_mem_map(DMA_MemMap_t *memMap /* Stores state information about the map */
);
/****************************************************************************/
/**
* Releases any memory currently being held by a memory mapping structure.
*/
/****************************************************************************/
int dma_term_mem_map(DMA_MemMap_t *memMap /* Stores state information about the map */
);
/****************************************************************************/
/**
* Looks at a memory address and categorizes it.
*
* @return One of the values from the DMA_MemType_t enumeration.
*/
/****************************************************************************/
DMA_MemType_t dma_mem_type(void *addr);
/****************************************************************************/
/**
* Sets the process (aka userTask) associated with a mem map. This is
* required if user-mode segments will be added to the mapping.
*/
/****************************************************************************/
static inline void dma_mem_map_set_user_task(DMA_MemMap_t *memMap,
struct task_struct *task)
{
memMap->userTask = task;
}
/****************************************************************************/
/**
* Looks at a memory address and determines if we support DMA'ing to/from
* that type of memory.
*
* @return boolean -
* return value != 0 means dma supported
* return value == 0 means dma not supported
*/
/****************************************************************************/
int dma_mem_supports_dma(void *addr);
/****************************************************************************/
/**
* Initializes a memory map for use. Since this function acquires a
* sempaphore within the memory map, it is VERY important that dma_unmap
* be called when you're finished using the map.
*/
/****************************************************************************/
int dma_map_start(DMA_MemMap_t *memMap, /* Stores state information about the map */
enum dma_data_direction dir /* Direction that the mapping will be going */
);
/****************************************************************************/
/**
* Adds a segment of memory to a memory map.
*
* @return 0 on success, error code otherwise.
*/
/****************************************************************************/
int dma_map_add_region(DMA_MemMap_t *memMap, /* Stores state information about the map */
void *mem, /* Virtual address that we want to get a map of */
size_t numBytes /* Number of bytes being mapped */
);
/****************************************************************************/
/**
* Creates a descriptor ring from a memory mapping.
*
* @return 0 on success, error code otherwise.
*/
/****************************************************************************/
int dma_map_create_descriptor_ring(DMA_Device_t dev, /* DMA device (where the ring is stored) */
DMA_MemMap_t *memMap, /* Memory map that will be used */
dma_addr_t devPhysAddr /* Physical address of device */
);
/****************************************************************************/
/**
* Maps in a memory region such that it can be used for performing a DMA.
*
* @return
*/
/****************************************************************************/
int dma_map_mem(DMA_MemMap_t *memMap, /* Stores state information about the map */
void *addr, /* Virtual address that we want to get a map of */
size_t count, /* Number of bytes being mapped */
enum dma_data_direction dir /* Direction that the mapping will be going */
);
/****************************************************************************/
/**
* Maps in a memory region such that it can be used for performing a DMA.
*
* @return
*/
/****************************************************************************/
int dma_unmap(DMA_MemMap_t *memMap, /* Stores state information about the map */
int dirtied /* non-zero if any of the pages were modified */
);
/****************************************************************************/
/**
* Initiates a transfer when the descriptors have already been setup.
......
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