sh_mobile_meram: MERAM framework for LCDC

Based on the patch by Takanari Hayama <taki@igel.co.jp>

Adds support framework necessary to use Media RAM (MERAM)
caching functionality with the LCDC.  The MERAM is accessed
through up to 4 Interconnect Buffers (ICBs).

ICB numbers and MERAM address ranges to use are specified in
by filling in the .meram_cfg member of the LCDC platform data

Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6d139679eb7a..a0282b133bcc 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1986,6 +1986,18 @@ config FB_SH_MOBILE_HDMI
         ---help---
           Driver for the on-chip SH-Mobile HDMI controller.
 
+config FB_SH_MOBILE_MERAM
+        tristate "SuperH Mobile MERAM read ahead support for LCDC"
+        depends on FB_SH_MOBILE_LCDC
+        default y
+        ---help---
+          Enable MERAM support for the SH-Mobile LCD controller.
+
+          This will allow for caching of the framebuffer to provide more
+          reliable access under heavy main memory bus traffic situations.
+          Up to 4 memory channels can be configured, allowing 4 RGB or
+          2 YCbCr framebuffers to be configured.
+
 config FB_TMIO
         tristate "Toshiba Mobile IO FrameBuffer support"
         depends on FB && MFD_CORE