Rev 54 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 54 | pj | 1 | /* |
| 2 | * icw.c: |
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| 3 | * |
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| 4 | * RAMDAC definition for IC Works DACs. |
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| 5 | * This version only supports the 16-bit ZoomDAC (w30C516), which |
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| 6 | * is compatible with the AT&T 20C498. |
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| 7 | * This DAC exists in 110, 135 and 170 MHz versions. |
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| 8 | * It can do packed 24-bit color (BG-RB-GR). |
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| 9 | * The 170 MHz version has a PCLK limit of 135 MHz |
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| 10 | * (170 pixel clock for 16-bit path for 8bpp LUT). |
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| 11 | */ |
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| 12 | |||
| 13 | #include <stdlib.h> |
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| 14 | #include <stdio.h> |
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| 15 | #include "libvga.h" |
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| 16 | |||
| 17 | #include "timing.h" |
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| 18 | #include "vgaregs.h" |
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| 19 | #include "driver.h" /* for __svgalib_driver_report */ |
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| 20 | #include "ramdac.h" |
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| 21 | |||
| 22 | #ifdef INCLUDE_ICW_DAC_TEST |
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| 23 | static int ICW_probe(void) |
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| 24 | { |
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| 25 | unsigned char mi, di; |
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| 26 | |||
| 27 | _ramdac_dactocomm(); |
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| 28 | inb(PEL_MSK); /* Control register 0. */ |
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| 29 | mi = inb(PEL_MSK); /* Manufacturer ID. */ |
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| 30 | di = inb(PEL_MSK); /* Device ID. */ |
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| 31 | if (mi == 0x84) { |
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| 32 | if (di == 0x98) |
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| 33 | return 1; |
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| 81 | giacomo | 34 | cprintf("svgalib: ICW_probe: Unknown IC Works DAC.\n"); |
| 54 | pj | 35 | } |
| 36 | return 0; |
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| 37 | } |
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| 38 | #else |
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| 39 | #define ICW_probe 0 |
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| 40 | #endif |
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| 41 | |||
| 42 | #ifdef INCLUDE_ICW_DAC |
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| 43 | static void ICW_init(void) |
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| 44 | { |
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| 45 | if (__svgalib_driver_report) |
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| 81 | giacomo | 46 | cprintf("svgalib: Using IC Works DAC (AT&T20C498-compatible).\n"); |
| 54 | pj | 47 | } |
| 48 | |||
| 49 | static int ICW_map_clock(int bpp, int pixelclock) |
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| 50 | { |
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| 51 | if (bpp == 8 && pixelclock > 80000) |
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| 52 | /* Use 16-bit path, clock doubling at RAMDAC. */ |
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| 53 | return pixelclock / 2; |
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| 54 | if (bpp == 16) |
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| 55 | return pixelclock; |
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| 56 | if (bpp == 24) |
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| 57 | /* Use the packed 24-bit mode. */ |
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| 58 | return pixelclock * 3 / 2; |
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| 59 | if (bpp == 32) |
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| 60 | return pixelclock * 2; |
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| 61 | return pixelclock; |
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| 62 | } |
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| 63 | |||
| 64 | static int ICW_map_horizontal_crtc(int bpp, int pixelclock, int htiming) |
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| 65 | { |
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| 66 | /* Not sure. */ |
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| 67 | if (bpp == 8 && pixelclock > 80000) |
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| 68 | /* Use 16-bit path, clock doubling at RAMDAC. */ |
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| 69 | return htiming / 2; |
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| 70 | if (bpp == 24) |
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| 71 | return htiming * 3 / 2; |
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| 72 | if (bpp == 32) |
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| 73 | return htiming * 2; |
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| 74 | return htiming; |
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| 75 | } |
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| 76 | |||
| 77 | static void ICW_initializestate(unsigned char *regs, int bpp, int colormode, |
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| 78 | int pixelclock) |
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| 79 | { |
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| 80 | regs[0] = 0; |
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| 81 | if (colormode == CLUT8_8) |
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| 82 | regs[0] = 0x02; |
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| 83 | if (colormode == RGB16_555) |
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| 84 | regs[0] = 0x10; |
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| 85 | if (colormode == RGB16_565) |
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| 86 | regs[0] = 0x30; |
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| 87 | if (colormode == RGB24_888_B) |
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| 88 | /* Packed mode. */ |
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| 89 | regs[0] = 0xB0; |
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| 90 | if (colormode == RGB32_888_B) |
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| 91 | regs[0] = 0x50; |
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| 92 | } |
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| 93 | |||
| 94 | static void ICW_qualify_cardspecs(CardSpecs * cardspecs, int dacspeed) |
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| 95 | { |
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| 96 | dacspeed = __svgalib_setDacSpeed(dacspeed, 110000); |
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| 97 | cardspecs->maxPixelClock4bpp = 0; |
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| 98 | cardspecs->maxPixelClock8bpp = dacspeed; |
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| 99 | cardspecs->maxPixelClock16bpp = dacspeed; |
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| 100 | cardspecs->maxPixelClock24bpp = dacspeed * 2 / 3; |
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| 101 | cardspecs->maxPixelClock32bpp = dacspeed / 2; |
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| 102 | cardspecs->mapClock = ICW_map_clock; |
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| 103 | cardspecs->mapHorizontalCrtc = ICW_map_horizontal_crtc; |
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| 104 | } |
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| 105 | |||
| 106 | DacMethods __svgalib_ICW_methods = |
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| 107 | { |
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| 108 | IC_WORKS, |
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| 109 | "IC Works DAC", |
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| 110 | 0, |
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| 111 | ICW_probe, |
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| 112 | ICW_init, |
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| 113 | ICW_qualify_cardspecs, |
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| 114 | __svgalib_Sierra_32K_savestate, |
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| 115 | __svgalib_Sierra_32K_restorestate, |
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| 116 | ICW_initializestate, |
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| 117 | 1 /* State size. */ |
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| 118 | }; |
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| 119 | #endif |