Commit 681e1473 authored by Ondrej Zajicek's avatar Ondrej Zajicek Committed by Linus Torvalds
Browse files

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: default avatarOndrej Zajicek <santiago@crfreenet.org>
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 558b7bd8

Documentation/fb/arkfb.txt

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	arkfb - fbdev driver for ARK Logic chips

	========================================





Supported Hardware

==================



	ARK 2000PV chip

	ICS 5342 ramdac



	- only BIOS initialized VGA devices supported

	- probably not working on big endian





Supported Features

==================



	*  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



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.



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).



Suspend/resume works on systems that initialize video card during resume and

if device is active (for example used by fbcon).





Missing Features

================

(alias TODO list)



	* 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)





Known bugs

==========



	* character attributes (and cursor) in text mode are broken



--

Ondrej Zajicek <santiago@crfreenet.org>

drivers/video/Kconfig

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@@ -1415,6 +1415,20 @@ config FB_TRIDENT_ACCEL 
	This will compile the Trident frame buffer device with

	acceleration functions.



config FB_ARK

	tristate "ARK 2000PV support"

	depends on FB && PCI

	select FB_CFB_FILLRECT

	select FB_CFB_COPYAREA

	select FB_CFB_IMAGEBLIT

	select FB_TILEBLITTING

	select FB_SVGALIB

	select VGASTATE

	select FONT_8x16 if FRAMEBUFFER_CONSOLE

	---help---

	  Driver for PCI graphics boards with ARK 2000PV chip

	  and ICS 5342 RAMDAC.



config FB_PM3

	tristate "Permedia3 support"

	depends on FB && PCI && BROKEN

drivers/video/Makefile

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@@ -59,6 +59,7 @@ obj-$(CONFIG_FB_CYBLA) += cyblafb.o 
obj-$(CONFIG_FB_TRIDENT)          += tridentfb.o

obj-$(CONFIG_FB_LE80578)          += vermilion/

obj-$(CONFIG_FB_S3)               += s3fb.o

obj-$(CONFIG_FB_ARK)              += arkfb.o

obj-$(CONFIG_FB_STI)              += stifb.o

obj-$(CONFIG_FB_FFB)              += ffb.o sbuslib.o

obj-$(CONFIG_FB_CG6)              += cg6.o sbuslib.o

drivers/video/arkfb.c

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File added.

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