Add driver specific mmap function to be able to mmap
frame buffer on PPC440SPe/PPC440EPx platforms. This
is needed because mmaping of the 36-bit physical
address of the frame buffer or MMIO is not supported
in generic fb_mmap().
Signed-off-by: Anatolij Gustschin <agust@xxxxxxx>
Cc: Ben Dooks <ben@xxxxxxxxxxxx>
Cc: Simtec Linux Team <linux@xxxxxxxxxxxx>
---
drivers/video/sm501fb.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/drivers/video/sm501fb.c b/drivers/video/sm501fb.c
index 0b59112..9cdc298 100644
--- a/drivers/video/sm501fb.c
+++ b/drivers/video/sm501fb.c
@@ -1426,6 +1426,52 @@ static void sm501fb_fillrect(struct fb_info *info, const struct fb_fillrect *rec
writel(0x800100cc, fbi->regs2d + SM501_2D_CONTROL);
}
+#if defined(CONFIG_440EPX) || defined(CONFIG_440SPe)
+static int sm501fb_mmap(struct fb_info *info,
+ struct vm_area_struct *vma)
+{
+ struct sm501fb_par *par = info->par;
+ struct sm501fb_info *fbi = par->info;
+ unsigned long long start;
+ unsigned long len, off, map_off;
+
+ off = vma->vm_pgoff << PAGE_SHIFT;
+ /*
+ * Get 36-bit base address of the frame buffer memory.
+ * Since it was previously truncated while assigning to
+ * fix.smem_start, we retrieve correct address here.
+ */
+ start = (fbi->fbmem_res->start & 0xf00000000ULL) +
+ info->fix.smem_start;
+ len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
+
+ if (off >= len) {
+ /* memory mapped io */
+ off -= len;
+ if (info->var.accel_flags)
+ return -EINVAL;
+ start = fbi->regs_res->start;
+ len = PAGE_ALIGN((start & ~PAGE_MASK) +
+ resource_size(fbi->regs_res));
+ }
+
+ start &= PAGE_MASK;
+ if ((vma->vm_end - vma->vm_start + off) > len)
+ return -EINVAL;
+
+ map_off = (unsigned long)((off + start) >> PAGE_SHIFT);
+ vma->vm_pgoff = map_off;
+
+ vma->vm_flags |= VM_IO | VM_RESERVED;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ if (io_remap_pfn_range(vma, vma->vm_start, map_off,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot))
+ return -EAGAIN;
+
+ return 0;
+}
+#endif
static struct fb_ops sm501fb_ops_crt = {
.owner = THIS_MODULE,
@@ -1439,6 +1485,9 @@ static struct fb_ops sm501fb_ops_crt = {
.fb_copyarea = sm501fb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_sync = sm501fb_sync,
+#if defined(CONFIG_440EPX) || defined(CONFIG_440SPe)
+ .fb_mmap = sm501fb_mmap,
+#endif
};
static struct fb_ops sm501fb_ops_pnl = {
@@ -1453,6 +1502,9 @@ static struct fb_ops sm501fb_ops_pnl = {
.fb_copyarea = sm501fb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_sync = sm501fb_sync,
+#if defined(CONFIG_440EPX) || defined(CONFIG_440SPe)
+ .fb_mmap = sm501fb_mmap,
+#endif
};
/* sm501_init_cursor
--
1.6.2.5
--
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