[ARM] pxafb: allow video memory size to be configurable

The amount of video memory size is decided according to the following
order:

1. <xres> x <yres> x <bits_per_pixel> by default, which is the backward
   compatible way

2. size specified in platform data

3. size specified in module parameter 'options' string or specified in
   kernel boot command line (see updated Documentation/fb/pxafb.txt)

And now since the memory is allocated from system memory, the pxafb_mmap
can be removed and the default fb_mmap() should be working all right.

Also, since we now have introduced the 'struct pxafb_dma_buff' for DMA
descriptors and palettes, the allocation can be separated cleanly.

NOTE: the LCD DMA actually supports chained transfer (i.e. page-based
transfers), to simplify the logic and keep the performance (with less
TLB misses when accessing from memory mapped user space), the memory
is allocated by alloc_pages_*() to ensures it's physical contiguous.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Eric Miao <ycmiao@ycmiao-hp520.(none)>

1 files changed, 4 insertions, 13 deletions

diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
index d8eb93fa03a3..0981938682ef 100644
--- a/drivers/video/pxafb.h
+++ b/drivers/video/pxafb.h
@@ -69,24 +69,15 @@ struct pxafb_info {
         void __iomem            *mmio_base;
 
         struct pxafb_dma_buff   *dma_buff;
+        size_t                  dma_buff_size;
         dma_addr_t              dma_buff_phys;
         dma_addr_t              fdadr[DMA_MAX];
 
-        /*
-         * These are the addresses we mapped
-         * the framebuffer memory region to.
-         */
-        /* raw memory addresses */
-        dma_addr_t              map_dma;        /* physical */
-        u_char *                map_cpu;        /* virtual */
-        u_int                   map_size;
-
-        /* addresses of pieces placed in raw buffer */
-        u_char *                screen_cpu;     /* virtual address of frame buffer */
-        dma_addr_t              screen_dma;     /* physical address of frame buffer */
+        void __iomem            *video_mem;     /* virtual address of frame buffer */
+        unsigned long           video_mem_phys; /* physical address of frame buffer */
+        size_t                  video_mem_size; /* size of the frame buffer */
         u16 *                   palette_cpu;    /* virtual address of palette memory */
         u_int                   palette_size;
-        ssize_t                 video_offset;
 
         u_int                   lccr0;
         u_int                   lccr3;