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This change add support for new dma buffer type(writecombine and cacheable)
which allows user application has more choices for the buffer type. And if
the dma buffer is cacheable, then add flush interfaces to make it cache
coherent when necessary.
Signed-off-by: Fancy Fang <B47543@freescale.com>
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The allocated DMA channels via some opened file descriptor is better
to be bound to this descriptor. Since this can avoid some application
to fake a channel id which may be requested by other applications to
request PXP service. And also, this make it easier to release the dma
channel when application exists abnormally or forgets to release it
explicitly.
Signed-off-by: Fancy Fang <B47543@freescale.com>
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The cpu_addr field in struct pxp_mem_desc cannot be used
by user application, so it is not necessary to pass this
field data to user. Now the similar field 'virtual' in
struct pxp_buf_obj is used to store the kernel space
virtual addr for allocated dma buffer.
Signed-off-by: Fancy Fang <B47543@freescale.com>
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Create pxp_info struct data for each opened device file descriptor.
And bind all the allocated dma buffers to this struct for each opened
file. This makes the dma buffer lists management safer, more effective
and more flexible.
Signed-off-by: Fancy Fang <B47543@freescale.com>
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header file
Some definitions used only by PXP device driver should not stay in
pxp_dma.h which is shared by PXP, EPDC and V4L2. So the patch creates
a new header file pxp_device.h to hold these definitions.
Signed-off-by: Fancy Fang <B47543@freescale.com>
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