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-rw-r--r--chips/ims332.c312
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diff --git a/chips/ims332.c b/chips/ims332.c
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--- a/chips/ims332.c
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-/*
- * Mach Operating System
- * Copyright (c) 1991,1990,1989 Carnegie Mellon University
- * All Rights Reserved.
- *
- * Permission to use, copy, modify and distribute this software and its
- * documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
- * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
- * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * Carnegie Mellon requests users of this software to return to
- *
- * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
- * School of Computer Science
- * Carnegie Mellon University
- * Pittsburgh PA 15213-3890
- *
- * any improvements or extensions that they make and grant Carnegie Mellon
- * the rights to redistribute these changes.
- */
-/*
- * File: ims332.c
- * Author: Alessandro Forin, Carnegie Mellon University
- * Date: 1/92
- *
- * Routines for the Inmos IMS-G332 Colour video controller
- */
-
-#include <platforms.h>
-
-#include <chips/ims332.h>
-#include <chips/screen.h>
-
-#include <chips/xcfb_monitor.h>
-
-/*
- * Generic register access
- */
-typedef volatile unsigned char *ims332_padded_regmap_t;
-
-#ifdef MAXINE
-
-unsigned int
-ims332_read_register(regs, regno)
- unsigned char *regs;
-{
- unsigned char *rptr;
- register unsigned int val, v1;
-
- /* spec sez: */
- rptr = regs + 0x80000 + (regno << 4);
- val = * ((volatile unsigned short *) rptr );
- v1 = * ((volatile unsigned short *) regs );
-
- return (val & 0xffff) | ((v1 & 0xff00) << 8);
-}
-
-ims332_write_register(regs, regno, val)
- unsigned char *regs;
- register unsigned int val;
-{
- unsigned char *wptr;
-
- /* spec sez: */
- wptr = regs + 0xa0000 + (regno << 4);
- * ((volatile unsigned int *)(regs)) = (val >> 8) & 0xff00;
- * ((volatile unsigned short *)(wptr)) = val;
-}
-
-#define assert_ims332_reset_bit(r) *r &= ~0x40
-#define deassert_ims332_reset_bit(r) *r |= 0x40
-
-#else /*MAXINE*/
-
-#define ims332_read_register(p,r) \
- ((unsigned int *)(p)) [ (r) ]
-#define ims332_write_register(p,r,v) \
- ((unsigned int *)(p)) [ (r) ] = (v)
-
-#endif /*MAXINE*/
-
-
-/*
- * Color map
- */
-ims332_load_colormap( regs, map)
- ims332_padded_regmap_t *regs;
- color_map_t *map;
-{
- register int i;
-
- for (i = 0; i < 256; i++, map++)
- ims332_load_colormap_entry(regs, i, map);
-}
-
-ims332_load_colormap_entry( regs, entry, map)
- ims332_padded_regmap_t *regs;
- color_map_t *map;
-{
- /* ?? stop VTG */
- ims332_write_register(regs, IMS332_REG_LUT_BASE + (entry & 0xff),
- (map->blue << 16) |
- (map->green << 8) |
- (map->red));
-}
-
-ims332_init_colormap( regs)
- ims332_padded_regmap_t *regs;
-{
- color_map_t m;
-
- m.red = m.green = m.blue = 0;
- ims332_load_colormap_entry( regs, 0, &m);
-
- m.red = m.green = m.blue = 0xff;
- ims332_load_colormap_entry( regs, 1, &m);
- ims332_load_colormap_entry( regs, 255, &m);
-
- /* since we are at it, also fix cursor LUT */
- ims332_load_colormap_entry( regs, IMS332_REG_CURSOR_LUT_0, &m);
- ims332_load_colormap_entry( regs, IMS332_REG_CURSOR_LUT_1, &m);
- /* *we* do not use this, but the prom does */
- ims332_load_colormap_entry( regs, IMS332_REG_CURSOR_LUT_2, &m);
-}
-
-#if 1/*debug*/
-ims332_print_colormap( regs)
- ims332_padded_regmap_t *regs;
-{
- register int i;
-
- for (i = 0; i < 256; i++) {
- register unsigned int color;
-
- color = ims332_read_register( regs, IMS332_REG_LUT_BASE + i);
- printf("%x->[x%x x%x x%x]\n", i,
- (color >> 16) & 0xff,
- (color >> 8) & 0xff,
- color & 0xff);
- }
-}
-#endif
-
-/*
- * Video on/off
- *
- * It is unfortunate that X11 goes backward with white@0
- * and black@1. So we must stash away the zero-th entry
- * and fix it while screen is off. Also must remember
- * it, sigh.
- */
-struct vstate {
- ims332_padded_regmap_t *regs;
- unsigned short off;
-};
-
-ims332_video_off(vstate, up)
- struct vstate *vstate;
- user_info_t *up;
-{
- register ims332_padded_regmap_t *regs = vstate->regs;
- register unsigned *save, csr;
-
- if (vstate->off)
- return;
-
- /* Yes, this is awful */
- save = (unsigned *)up->dev_dep_2.gx.colormap;
-
- *save = ims332_read_register(regs, IMS332_REG_LUT_BASE);
-
- ims332_write_register(regs, IMS332_REG_LUT_BASE, 0);
-
- ims332_write_register( regs, IMS332_REG_COLOR_MASK, 0);
-
- /* cursor now */
- csr = ims332_read_register(regs, IMS332_REG_CSR_A);
- csr |= IMS332_CSR_A_DISABLE_CURSOR;
- ims332_write_register(regs, IMS332_REG_CSR_A, csr);
-
- vstate->off = 1;
-}
-
-ims332_video_on(vstate, up)
- struct vstate *vstate;
- user_info_t *up;
-{
- register ims332_padded_regmap_t *regs = vstate->regs;
- register unsigned *save, csr;
-
- if (!vstate->off)
- return;
-
- /* Like I said.. */
- save = (unsigned *)up->dev_dep_2.gx.colormap;
-
- ims332_write_register(regs, IMS332_REG_LUT_BASE, *save);
-
- ims332_write_register( regs, IMS332_REG_COLOR_MASK, 0xffffffff);
-
- /* cursor now */
- csr = ims332_read_register(regs, IMS332_REG_CSR_A);
- csr &= ~IMS332_CSR_A_DISABLE_CURSOR;
- ims332_write_register(regs, IMS332_REG_CSR_A, csr);
-
- vstate->off = 0;
-}
-
-/*
- * Cursor
- */
-ims332_pos_cursor(regs,x,y)
- ims332_padded_regmap_t *regs;
- register int x,y;
-{
- ims332_write_register( regs, IMS332_REG_CURSOR_LOC,
- ((x & 0xfff) << 12) | (y & 0xfff) );
-}
-
-
-ims332_cursor_color( regs, color)
- ims332_padded_regmap_t *regs;
- color_map_t *color;
-{
- /* Bg is color[0], Fg is color[1] */
- ims332_write_register(regs, IMS332_REG_CURSOR_LUT_0,
- (color->blue << 16) |
- (color->green << 8) |
- (color->red));
- color++;
- ims332_write_register(regs, IMS332_REG_CURSOR_LUT_1,
- (color->blue << 16) |
- (color->green << 8) |
- (color->red));
-}
-
-ims332_cursor_sprite( regs, cursor)
- ims332_padded_regmap_t *regs;
- unsigned short *cursor;
-{
- register int i;
-
- /* We *could* cut this down a lot... */
- for (i = 0; i < 512; i++, cursor++)
- ims332_write_register( regs,
- IMS332_REG_CURSOR_RAM+i, *cursor);
-}
-
-/*
- * Initialization
- */
-ims332_init(regs, reset, mon)
- ims332_padded_regmap_t *regs;
- unsigned int *reset;
- xcfb_monitor_type_t mon;
-{
- int shortdisplay, broadpulse, frontporch;
-
- assert_ims332_reset_bit(reset);
- delay(1); /* specs sez 50ns.. */
- deassert_ims332_reset_bit(reset);
-
- /* CLOCKIN appears to receive a 6.25 Mhz clock --> PLL 12 for 75Mhz monitor */
- ims332_write_register(regs, IMS332_REG_BOOT, 12 | IMS332_BOOT_CLOCK_PLL);
-
- /* initialize VTG */
- ims332_write_register(regs, IMS332_REG_CSR_A,
- IMS332_BPP_8 | IMS332_CSR_A_DISABLE_CURSOR);
- delay(50); /* spec does not say */
-
- /* datapath registers (values taken from prom's settings) */
-
- frontporch = mon->line_time - (mon->half_sync * 2 +
- mon->back_porch +
- mon->frame_visible_width / 4);
-
- shortdisplay = mon->line_time / 2 - (mon->half_sync * 2 +
- mon->back_porch + frontporch);
- broadpulse = mon->line_time / 2 - frontporch;
-
- ims332_write_register( regs, IMS332_REG_HALF_SYNCH, mon->half_sync);
- ims332_write_register( regs, IMS332_REG_BACK_PORCH, mon->back_porch);
- ims332_write_register( regs, IMS332_REG_DISPLAY,
- mon->frame_visible_width / 4);
- ims332_write_register( regs, IMS332_REG_SHORT_DIS, shortdisplay);
- ims332_write_register( regs, IMS332_REG_BROAD_PULSE, broadpulse);
- ims332_write_register( regs, IMS332_REG_V_SYNC, mon->v_sync * 2);
- ims332_write_register( regs, IMS332_REG_V_PRE_EQUALIZE,
- mon->v_pre_equalize);
- ims332_write_register( regs, IMS332_REG_V_POST_EQUALIZE,
- mon->v_post_equalize);
- ims332_write_register( regs, IMS332_REG_V_BLANK, mon->v_blank * 2);
- ims332_write_register( regs, IMS332_REG_V_DISPLAY,
- mon->frame_visible_height * 2);
- ims332_write_register( regs, IMS332_REG_LINE_TIME, mon->line_time);
- ims332_write_register( regs, IMS332_REG_LINE_START, mon->line_start);
- ims332_write_register( regs, IMS332_REG_MEM_INIT, mon->mem_init);
- ims332_write_register( regs, IMS332_REG_XFER_DELAY, mon->xfer_delay);
-
- ims332_write_register( regs, IMS332_REG_COLOR_MASK, 0xffffff);
-
- ims332_init_colormap( regs );
-
- ims332_write_register(regs, IMS332_REG_CSR_A,
- IMS332_BPP_8 | IMS332_CSR_A_DMA_DISABLE | IMS332_CSR_A_VTG_ENABLE);
-
-}
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