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arkfb: new framebuffer driver for ARK Logic cards
This patch adds fbdev driver for graphics cards with ARK Logic 2000PV graphics chip with ICS 5342 ramdac. [adaplas@gmail.com: build fixes] Signed-off-by: Ondrej Zajicek <santiago@crfreenet.org> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Ondrej Zajicek
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Linus Torvalds
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May 9, 2007
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arkfb - fbdev driver for ARK Logic chips | ||
======================================== | ||
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Supported Hardware | ||
================== | ||
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ARK 2000PV chip | ||
ICS 5342 ramdac | ||
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- only BIOS initialized VGA devices supported | ||
- probably not working on big endian | ||
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Supported Features | ||
================== | ||
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* 4 bpp pseudocolor modes (with 18bit palette, two variants) | ||
* 8 bpp pseudocolor mode (with 18bit palette) | ||
* 16 bpp truecolor modes (RGB 555 and RGB 565) | ||
* 24 bpp truecolor mode (RGB 888) | ||
* 32 bpp truecolor mode (RGB 888) | ||
* text mode (activated by bpp = 0) | ||
* doublescan mode variant (not available in text mode) | ||
* panning in both directions | ||
* suspend/resume support | ||
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Text mode is supported even in higher resolutions, but there is limitation to | ||
lower pixclocks (i got maximum about 70 MHz, it is dependent on specific | ||
hardware). This limitation is not enforced by driver. Text mode supports 8bit | ||
wide fonts only (hardware limitation) and 16bit tall fonts (driver | ||
limitation). Unfortunately character attributes (like color) in text mode are | ||
broken for unknown reason, so its usefulness is limited. | ||
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There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with | ||
packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode | ||
with interleaved planes (1 byte interleave), MSB first. Both modes support | ||
8bit wide fonts only (driver limitation). | ||
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Suspend/resume works on systems that initialize video card during resume and | ||
if device is active (for example used by fbcon). | ||
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Missing Features | ||
================ | ||
(alias TODO list) | ||
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* secondary (not initialized by BIOS) device support | ||
* big endian support | ||
* DPMS support | ||
* MMIO support | ||
* interlaced mode variant | ||
* support for fontwidths != 8 in 4 bpp modes | ||
* support for fontheight != 16 in text mode | ||
* hardware cursor | ||
* vsync synchronization | ||
* feature connector support | ||
* acceleration support (8514-like 2D) | ||
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Known bugs | ||
========== | ||
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* character attributes (and cursor) in text mode are broken | ||
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-- | ||
Ondrej Zajicek <santiago@crfreenet.org> |
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