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1.1 root 1: /* Copyright (c) 1993 by NeXT Computer, Inc.
2: * All rights reserved.
3: *
4: * S3.m -- driver for S3 86C805 and 86C928 Graphics Accelerators
5: *
6: * Created by Peter Graffagnino 1/31/93
7: * Modified by Derek B Clegg 21 May 1993
8: */
9: #import <driverkit/i386/IOEISADeviceDescription.h>
10: #import "S3.h"
11:
12: @implementation S3
13:
14: /* Put the display into linear framebuffer mode. This typically happens
15: * when the window server starts running.
16: */
17: - (void)enterLinearMode
18: {
19: /* Set up the chip to use the selected mode. */
20: [self initializeMode];
21:
22: /* Set the gamma-corrected gray-scale palette if necessary. */
23: [self setGammaTable];
24:
25: /* Enter linear mode. */
26: if ([self enableLinearFrameBuffer] == nil) {
27: IOLog("%s: Failed to enter linear mode.\n", [self name]);
28: return;
29: }
30: }
31:
32: /* Get the device out of whatever advanced linear mode it was using and back
33: * into a state where it can be used as a standard VGA device.
34: */
35: - (void)revertToVGAMode
36: {
37: /* Reset the VGA parameters. */
38: [self resetVGA];
39:
40: /* Let the superclass do whatever work it needs to do. */
41: [super revertToVGAMode];
42: }
43:
44: /* Set the brightness to `level'.
45: */
46: - setBrightness:(int)level token:(int)t
47: {
48: if (level < EV_SCREEN_MIN_BRIGHTNESS || level > EV_SCREEN_MAX_BRIGHTNESS) {
49: IOLog("QVision: Invalid brightness level `%d'.\n", level);
50: return nil;
51: }
52: brightnessLevel = level;
53: [self setGammaTable];
54: return self;
55: }
56:
57: /* Set the transfer tables.
58: */
59: - setTransferTable:(const unsigned int *)table count:(int)numEntries
60: {
61: int k;
62: IOBitsPerPixel bpp;
63: IOColorSpace cspace;
64:
65: if (redTransferTable != 0)
66: IOFree(redTransferTable, 3 * transferTableCount);
67:
68: transferTableCount = numEntries;
69:
70: redTransferTable = IOMalloc(3 * numEntries);
71: greenTransferTable = redTransferTable + numEntries;
72: blueTransferTable = greenTransferTable + numEntries;
73:
74: bpp = [self displayInfo]->bitsPerPixel;
75: cspace = [self displayInfo]->colorSpace;
76:
77: if (bpp == IO_8BitsPerPixel && cspace == IO_OneIsWhiteColorSpace) {
78: for (k = 0; k < numEntries; k++) {
79: redTransferTable[k] = greenTransferTable[k] =
80: blueTransferTable[k] = table[k] & 0xFF;
81: }
82: } else if (cspace == IO_RGBColorSpace &&
83: (bpp == IO_8BitsPerPixel ||
84: bpp == IO_15BitsPerPixel ||
85: bpp == IO_24BitsPerPixel)) {
86: for (k = 0; k < numEntries; k++) {
87: redTransferTable[k] = (table[k] >> 24) & 0xFF;
88: greenTransferTable[k] = (table[k] >> 16) & 0xFF;
89: blueTransferTable[k] = (table[k] >> 8) & 0xFF;
90: }
91: } else {
92: IOFree(redTransferTable, 3 * numEntries);
93: redTransferTable = 0;
94: }
95: [self setGammaTable];
96: return self;
97: }
98:
99: - initFromDeviceDescription:deviceDescription
100: {
101: IODisplayInfo *displayInfo;
102: const IORange *range;
103: const S3Mode *s3mode;
104: const char *s;
105:
106: if ([super initFromDeviceDescription:deviceDescription] == nil)
107: return [super free];
108:
109: if ([self determineConfiguration] == nil)
110: return [super free];
111:
112: if ([self selectMode] == nil)
113: return [super free];
114:
115: range = [deviceDescription memoryRangeList];
116: if (range == 0) {
117: IOLog("%s: No memory range set.\n", [self name]);
118: return [super free];
119: }
120: videoRamAddress = range[0].start;
121:
122: redTransferTable = greenTransferTable = blueTransferTable = 0;
123: transferTableCount = 0;
124: brightnessLevel = EV_SCREEN_MAX_BRIGHTNESS;
125:
126: displayInfo = [self displayInfo];
127: s3mode = displayInfo->parameters;
128: displayInfo->flags = 0;
129:
130: /* Some S3 805 cards have a lot of flicker when write-posting or
131: * read-ahead is enabled. We disable both, but provide a way to
132: * turn them on from the config table. It's a good idea to enable
133: * both if possible, since it speeds up the display a good deal.
134: */
135:
136: writePostingEnabled = [self booleanForStringKey:"WritePostingEnabled"
137: withDefault:(adapter == S3_805 ? NO : YES)];
138: readAheadCacheEnabled = [self booleanForStringKey:"ReadAheadCacheEnabled"
139: withDefault:(adapter == S3_805 ? NO : YES)];
140:
141: /* Turn on s/w gamma correction. (This is only necessary for the 555/16
142: * modes.) */
143:
144: if ([self hasTransferTable])
145: displayInfo->flags |= IO_DISPLAY_HAS_TRANSFER_TABLE;
146:
147: if ([self needsSoftwareGammaCorrection])
148: displayInfo->flags |= IO_DISPLAY_NEEDS_SOFTWARE_GAMMA_CORRECTION;
149:
150: if (adapter == S3_805) {
151: /* On the 805, always turn the cache off. */
152: displayInfo->flags |= IO_DISPLAY_CACHE_OFF;
153: } else {
154: s = [self valueForStringKey:"DisplayCacheMode"];
155: if (s != 0) {
156: if (strcmp(s, "Off") == 0)
157: displayInfo->flags |= IO_DISPLAY_CACHE_OFF;
158: else if (strcmp(s, "WriteThrough") == 0)
159: displayInfo->flags |= IO_DISPLAY_CACHE_WRITETHROUGH;
160: else if (strcmp(s, "CopyBack") == 0)
161: displayInfo->flags |= IO_DISPLAY_CACHE_COPYBACK;
162: else
163: IOLog("%s: Unrecognized value for key `DisplayCacheMode': "
164: "`%s'.\n", [self name], s);
165: }
166: }
167:
168: displayInfo->frameBuffer =
169: (void *)[self mapFrameBufferAtPhysicalAddress:videoRamAddress
170: length:s3mode->memSize];
171: if (displayInfo->frameBuffer == 0)
172: return [super free];
173:
174: IOLog("%s: Initialized `%s' @ %d Hz.\n", [self name], s3mode->name,
175: displayInfo->refreshRate);
176:
177: return self;
178: }
179: @end
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