root / prex-0.9.0 / bsp / drv / dev / video / vga.c @ 03e9c04a
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/*-
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* Copyright (c) 2005-2009, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* vga.c - vga driver
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*/
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#include <driver.h> |
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#include <wscons.h> |
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#include <devctl.h> |
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#include <pm.h> |
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/* #define DEBUG_VGA 1 */
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#ifdef DEBUG_VGA
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#define DPRINTF(a) printf a
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#else
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#define DPRINTF(a)
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#endif
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#define CRTC_INDEX 0x3d4 |
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#define CRTC_DATA 0x3d5 |
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#define SEQ_INDEX 0x3c4 |
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#define SEQ_DATA 0x3c5 |
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#define VID_RAM 0xB8000 |
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struct vga_softc {
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device_t dev; |
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short *vram;
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int cols;
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int attr;
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int blank;
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}; |
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static int vga_devctl(device_t, u_long, void *); |
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static int vga_init(struct driver *); |
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static void vga_cursor(void*, int, int); |
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static void vga_putc(void *, int, int, int); |
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static void vga_copyrows(void *,int, int, int); |
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static void vga_eraserows(void *,int, int); |
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static void vga_set_attr(void *, int); |
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static void vga_get_cursor(void *, int *, int *); |
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static struct devops vga_devops = { |
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/* open */ no_open,
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/* close */ no_close,
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/* read */ no_read,
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/* write */ no_write,
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/* ioctl */ no_ioctl,
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/* devctl */ vga_devctl,
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}; |
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struct driver vga_driver = {
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/* name */ "vga", |
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/* devops */ &vga_devops,
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/* devsz */ sizeof(struct vga_softc), |
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/* flags */ 0, |
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/* probe */ NULL, |
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/* init */ vga_init,
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/* shutdown */ NULL, |
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}; |
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static struct wscons_video_ops wscons_vga_ops = { |
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vga_cursor, /* cursor */
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vga_putc, /* putc */
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vga_copyrows, /* copyrows */
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vga_eraserows, /* eraserows */
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vga_set_attr, /* set_attr */
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vga_get_cursor, /* set_cursor */
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}; |
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static u_char
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crtc_read(u_char index) |
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{ |
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bus_write_8(CRTC_INDEX, index); |
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return bus_read_8(CRTC_DATA);
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} |
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static void |
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crtc_write(u_char index, u_char val) |
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{ |
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bus_write_8(CRTC_INDEX, index); |
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bus_write_8(CRTC_DATA, val); |
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} |
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static void |
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vga_on(void)
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{ |
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u_char val; |
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bus_write_8(SEQ_INDEX, 1);
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val = bus_read_8(SEQ_DATA); |
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bus_write_8(SEQ_DATA, val & ~0x20);
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} |
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static void |
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vga_off(void)
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{ |
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u_char val; |
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bus_write_8(SEQ_INDEX, 1);
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val = bus_read_8(SEQ_DATA); |
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bus_write_8(SEQ_DATA, val | 0x20);
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} |
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static void |
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vga_cursor(void *aux, int row, int col) |
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{ |
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struct vga_softc *sc = aux;
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int pos, s;
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pos = row * sc->cols + col; |
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s = splhigh(); |
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crtc_write(0x0e, (u_char)((pos >> 8) & 0xff)); |
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crtc_write(0x0f, (u_char)(pos & 0xff)); |
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splx(s); |
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} |
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static void |
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vga_putc(void *aux, int row, int col, int ch) |
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{ |
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struct vga_softc *sc = aux;
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sc->vram[row * sc->cols + col] = ch | (sc->attr << 8);
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} |
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static void |
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vga_copyrows(void *aux, int srcrow, int dstrow, int nrows) |
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{ |
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struct vga_softc *sc = aux;
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memcpy(sc->vram + dstrow * sc->cols, |
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sc->vram + srcrow * sc->cols, |
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(size_t)nrows * sc->cols * 2);
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} |
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static void |
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vga_eraserows(void *aux, int row, int nrows) |
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{ |
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struct vga_softc *sc = aux;
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int i, start, end;
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start = row * sc->cols; |
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end = start + nrows * sc->cols; |
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for (i = start; i < end; i++)
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sc->vram[i] = ' ' | (sc->attr << 8); |
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} |
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static void |
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vga_set_attr(void *aux, int attr) |
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{ |
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struct vga_softc *sc = aux;
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sc->attr = attr; |
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} |
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static void |
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vga_get_cursor(void *aux, int *col, int *row) |
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{ |
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struct vga_softc *sc = aux;
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u_int offset; |
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int s;
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s = splhigh(); |
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offset = crtc_read(0x0e);
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offset <<= 8;
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offset += crtc_read(0x0f);
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*col = (int)offset % sc->cols;
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*row = (int)offset / sc->cols;
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splx(s); |
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} |
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static int |
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vga_devctl(device_t dev, u_long cmd, void *arg)
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{ |
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struct vga_softc *sc = device_private(dev);
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int s;
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DPRINTF(("vga: devctl cmd=%x\n", cmd));
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s = splhigh(); |
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switch (cmd) {
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case DEVCTL_PM_LCDOFF:
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if (!sc->blank) {
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DPRINTF(("vga: LCD off\n"));
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vga_off(); |
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sc->blank = 1;
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} |
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break;
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case DEVCTL_PM_LCDON:
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if (sc->blank) {
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vga_on(); |
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sc->blank = 0;
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DPRINTF(("vga: LCD on\n"));
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} |
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break;
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} |
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splx(s); |
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return 0; |
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} |
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static int |
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vga_init(struct driver *self)
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{ |
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device_t dev; |
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struct bootinfo *bi;
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struct vga_softc *sc;
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machine_bootinfo(&bi); |
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dev = device_create(self, "vga", D_CHR);
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sc = device_private(dev); |
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sc->vram = ptokv(VID_RAM); |
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sc->cols = bi->video.text_x; |
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sc->attr = 0x0f;
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sc->blank = 0;
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wscons_attach_video(&wscons_vga_ops, sc); |
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pm_attach_lcd(dev); |
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return 0; |
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} |