#9 GXE64 support

[Jeremy Fitzhardinge jeremy@sour.sw.oz.au]

jmk@plan9.att.com:
> my suspicion is that aux/vga is not switching over to 2x8-bit mode for the
> higher clock rates when it can, we've never played with any resolution
> requiring a clock between 80MHz and 135MHz.
> 
> please post your parameters.

This is how XFree86 detects my card:
# XF86_S3 -probeonly
(**) stands for supplied, (--) stands for probed/default values
(**) Mouse: type: MouseSystems, device: /dev/mouse, baudrate: 1200
(**) S3: Graphics device ID: "#9GXE64"
(**) S3: Monitor ID: "MX17FG"
(**) FontPath set to "/usr/X11R6/lib/X11/fonts/75dpi/,/usr/X11R6/lib/X11/fonts/100dpi/,/usr/X11R6/lib/X11/fonts/misc/,/usr/X11R6/lib/X11/fonts/Type1/,/usr/X11R6/lib/X11/fonts/Speedo/"
(**) S3: Option "number_nine"
(--) S3: card type: PCI
(--) S3: chipset:   864 rev. 0
(**) S3: chipset driver: mmio_928
(**) S3: videoram:  2048k
(--) S3: Detected an ATT 20C498/21C498 RAMDAC
(--) S3: Ramdac type: att20c498
(**) S3: Ramdac speed: 135
(**) S3: Using ICD2061A programmable clock
(--) S3: Maximum allowed dot-clock: 135.000 MHz
(**) S3: Mode "1184x888@100": mode clock = 100.000
(**) S3: Mode "1152x864@90": mode clock =  90.000
(**) S3: Mode "1024x768": mode clock =  75.000
(**) S3: Mode "800x600": mode clock =  50.000
(**) S3: Mode "640x480": mode clock =  25.000
(--) S3: Using 8 bits per RGB value
(--) S3: Virtual resolution set to 1184x888

Here's the relevent details from /lib/vgadb:

ctlr
	0xC0094="#9-864"					# #9GXE64
	0xC0044="Phoenix S3 Vision864 (16Bit DAC)"		# GIS Globalyst 550
	link=vga
	hwgc=s3hwgc
	ctlr=vision864 link=ibm8514
	ramdac=att21c498-135
	clock=icd2061a link=s3clock

# From XFree86 config file:
#    ModeLine "1184x888"	100 1184 1216 1576 1608 888 891 903 928
include = 1184x888@67Hz
	clock=100
	shb=1216 ehb=1576 ht=1608
	vrs=891 vre=903 vt=928

#
# MAG MX17FG
# Horizontal timing:
#	Allowable frequency range: 30-64KHz
# Vertical timing:
#	Allowable frequency range: 50-120Hz
# Video bandwidth:
#	120MHz monitor
mag17fg = 1184x888x8
	include=1184x888@67Hz
mag17fg = 1184x888x4
	include=1184x888@67Hz
mag17fg = 1184x888x1
	include=1184x888@67Hz
#  ModeLine "1152x864@90"   90 1152 1184 1496 1528  864  867  876  900
#mag17fg = 1152x864x1
#	clock=90
#	shb=1184 ehb=1496 ht=1528
#	vrs=867 vre=876 vt=900

#  ModeLine "1152x864@80"   80 1152 1160 1384 1480  864  867  876  900
mag17fg = 1152x864x1
	clock=80
	shb=1160 ehb=1384 ht=1480
	vrs=867 vre=876 vt=900
mag17fg
	alias=multisync75