/* $NetBSD: pcdisplay.c,v 1.47 2021/08/07 16:19:12 thorpej Exp $ */

/*
* Copyright (c) 1998
*      Matthias Drochner.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pcdisplay.c,v 1.47 2021/08/07 16:19:12 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/bus.h>

#include <dev/isa/isavar.h>

#include <dev/ic/mc6845reg.h>
#include <dev/ic/pcdisplayvar.h>
#include <dev/isa/pcdisplayvar.h>

#include <dev/ic/pcdisplay.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>

#include "pcweasel.h"
#if NPCWEASEL > 0
#include <dev/isa/weaselreg.h>
#include <dev/isa/weaselvar.h>
#endif

struct pcdisplay_config {
       struct pcdisplayscreen pcs;
       struct pcdisplay_handle dc_ph;
       int mono;
};

struct pcdisplay_softc {
       struct pcdisplay_config *sc_dc;
       int nscreens;
#if NPCWEASEL > 0
       struct weasel_handle sc_weasel;
#endif
};

static int pcdisplayconsole, pcdisplay_console_attached;
static struct pcdisplay_config pcdisplay_console_dc;

int     pcdisplay_match(device_t, cfdata_t, void *);
void    pcdisplay_attach(device_t, device_t, void *);

static int pcdisplay_is_console(bus_space_tag_t);
static int pcdisplay_probe_col(bus_space_tag_t, bus_space_tag_t);
static int pcdisplay_probe_mono(bus_space_tag_t, bus_space_tag_t);
static void pcdisplay_init(struct pcdisplay_config *,
                            bus_space_tag_t, bus_space_tag_t,
                            int);
static int pcdisplay_allocattr(void *, int, int, int, long *);

CFATTACH_DECL_NEW(pcdisplay, sizeof(struct pcdisplay_softc),
   pcdisplay_match, pcdisplay_attach, NULL, NULL);

const struct wsdisplay_emulops pcdisplay_emulops = {
       pcdisplay_cursor,
       pcdisplay_mapchar,
       pcdisplay_putchar,
       pcdisplay_copycols,
       pcdisplay_erasecols,
       pcdisplay_copyrows,
       pcdisplay_eraserows,
       pcdisplay_allocattr,
       NULL,   /* replaceattr */
};

const struct wsscreen_descr pcdisplay_scr = {
       "80x25", 80, 25,
       &pcdisplay_emulops,
       0, 0, /* no font support */
       WSSCREEN_REVERSE, /* that's minimal... */
       NULL, /* modecookie */
};

const struct wsscreen_descr *_pcdisplay_scrlist[] = {
       &pcdisplay_scr,
};

const struct wsscreen_list pcdisplay_screenlist = {
       sizeof(_pcdisplay_scrlist) / sizeof(struct wsscreen_descr *),
       _pcdisplay_scrlist
};

static int pcdisplay_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t pcdisplay_mmap(void *, void *, off_t, int);
static int pcdisplay_alloc_screen(void *, const struct wsscreen_descr *,
                                      void **, int *, int *, long *);
static void pcdisplay_free_screen(void *, void *);
static int pcdisplay_show_screen(void *, void *, int,
                                     void (*) (void *, int, int), void *);

const struct wsdisplay_accessops pcdisplay_accessops = {
       pcdisplay_ioctl,
       pcdisplay_mmap,
       pcdisplay_alloc_screen,
       pcdisplay_free_screen,
       pcdisplay_show_screen,
       NULL, /* load_font */
       NULL, /* pollc */
       NULL, /* scroll */
};

static int
pcdisplay_probe_col(bus_space_tag_t iot, bus_space_tag_t memt)
{
       bus_space_handle_t memh, ioh_6845;
       u_int16_t oldval, val;

       if (bus_space_map(memt, 0xb8000, 0x8000, 0, &memh))
               return (0);
       oldval = bus_space_read_2(memt, memh, 0);
       bus_space_write_2(memt, memh, 0, 0xa55a);
       val = bus_space_read_2(memt, memh, 0);
       bus_space_write_2(memt, memh, 0, oldval);
       bus_space_unmap(memt, memh, 0x8000);
       if (val != 0xa55a)
               return (0);

       if (bus_space_map(iot, 0x3d0, 0x10, 0, &ioh_6845))
               return (0);
       bus_space_unmap(iot, ioh_6845, 0x10);

       return (1);
}

static int
pcdisplay_probe_mono(bus_space_tag_t iot, bus_space_tag_t memt)
{
       bus_space_handle_t memh, ioh_6845;
       u_int16_t oldval, val;

       if (bus_space_map(memt, 0xb0000, 0x8000, 0, &memh))
               return (0);
       oldval = bus_space_read_2(memt, memh, 0);
       bus_space_write_2(memt, memh, 0, 0xa55a);
       val = bus_space_read_2(memt, memh, 0);
       bus_space_write_2(memt, memh, 0, oldval);
       bus_space_unmap(memt, memh, 0x8000);
       if (val != 0xa55a)
               return (0);

       if (bus_space_map(iot, 0x3b0, 0x10, 0, &ioh_6845))
               return (0);
       bus_space_unmap(iot, ioh_6845, 0x10);

       return (1);
}

static void
pcdisplay_init(struct pcdisplay_config *dc, bus_space_tag_t iot,
   bus_space_tag_t memt, int mono)
{
       struct pcdisplay_handle *ph = &dc->dc_ph;
       int cpos;

       ph->ph_iot = iot;
       ph->ph_memt = memt;
       dc->mono = mono;

       if (bus_space_map(memt, mono ? 0xb0000 : 0xb8000, 0x8000,
           BUS_SPACE_MAP_CACHEABLE, &ph->ph_memh))
               panic("pcdisplay_init: cannot map memory");
       if (bus_space_map(iot, mono ? 0x3b0 : 0x3d0, 0x10,
                         0, &ph->ph_ioh_6845))
               panic("pcdisplay_init: cannot map io");

       /*
        * initialize the only screen
        */
       dc->pcs.hdl = ph;
       dc->pcs.type = &pcdisplay_scr;
       dc->pcs.active = 1;
       dc->pcs.mem = NULL;

       cpos = pcdisplay_6845_read(ph, cursorh) << 8;
       cpos |= pcdisplay_6845_read(ph, cursorl);

       /* make sure we have a valid cursor position */
       if (cpos < 0 || cpos >= pcdisplay_scr.nrows * pcdisplay_scr.ncols)
               cpos = 0;

       dc->pcs.dispoffset = 0;

       dc->pcs.cursorrow = cpos / pcdisplay_scr.ncols;
       dc->pcs.cursorcol = cpos % pcdisplay_scr.ncols;
       pcdisplay_cursor_init(&dc->pcs, 1);
}

int
pcdisplay_match(device_t parent, cfdata_t match, void *aux)
{
       struct isa_attach_args *ia = aux;
       int mono;

       if (ISA_DIRECT_CONFIG(ia))
               return (0);

       /* If values are hardwired to something that they can't be, punt. */
       if (ia->ia_nio < 1 ||
           (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
            ia->ia_io[0].ir_addr != 0x3d0 &&
            ia->ia_io[0].ir_addr != 0x3b0))
               return (0);

       if (ia->ia_niomem < 1 ||
           (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM &&
            ia->ia_iomem[0].ir_addr != 0xb8000 &&
            ia->ia_iomem[0].ir_addr != 0xb0000))
               return (0);
       if (ia->ia_iomem[0].ir_size != 0 &&
           ia->ia_iomem[0].ir_size != 0x8000)
               return (0);

       if (ia->ia_nirq > 0 &&
           ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ)
               return (0);

       if (ia->ia_ndrq > 0 &&
           ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ)
               return (0);

       if (pcdisplay_is_console(ia->ia_iot))
               mono = pcdisplay_console_dc.mono;
       else if (ia->ia_io[0].ir_addr != 0x3b0 &&
                ia->ia_iomem[0].ir_addr != 0xb0000 &&
                pcdisplay_probe_col(ia->ia_iot, ia->ia_memt))
               mono = 0;
       else if (ia->ia_io[0].ir_addr != 0x3d0 &&
                ia->ia_iomem[0].ir_addr != 0xb8000 &&
                pcdisplay_probe_mono(ia->ia_iot, ia->ia_memt))
               mono = 1;
       else
               return (0);

       ia->ia_nio = 1;
       ia->ia_io[0].ir_addr = mono ? 0x3b0 : 0x3d0;
       ia->ia_io[0].ir_size = 0x10;

       ia->ia_niomem = 1;
       ia->ia_iomem[0].ir_addr = mono ? 0xb0000 : 0xb8000;
       ia->ia_iomem[0].ir_size = 0x8000;

       ia->ia_nirq = 0;
       ia->ia_ndrq = 0;

       return (1);
}

void
pcdisplay_attach(device_t parent, device_t self, void *aux)
{
       struct isa_attach_args *ia = aux;
       struct pcdisplay_softc *sc = device_private(self);
       int console;
       struct pcdisplay_config *dc;
       struct wsemuldisplaydev_attach_args aa;

       printf("\n");

       console = pcdisplay_is_console(ia->ia_iot);

       if (console) {
               dc = &pcdisplay_console_dc;
               sc->nscreens = 1;
               pcdisplay_console_attached = 1;
       } else {
               dc = malloc(sizeof(struct pcdisplay_config),
                           M_DEVBUF, M_WAITOK);
               if (ia->ia_io[0].ir_addr != 0x3b0 &&
                   ia->ia_iomem[0].ir_addr != 0xb0000 &&
                   pcdisplay_probe_col(ia->ia_iot, ia->ia_memt))
                       pcdisplay_init(dc, ia->ia_iot, ia->ia_memt, 0);
               else if (ia->ia_io[0].ir_addr != 0x3d0 &&
                        ia->ia_iomem[0].ir_addr != 0xb8000 &&
                        pcdisplay_probe_mono(ia->ia_iot, ia->ia_memt))
                       pcdisplay_init(dc, ia->ia_iot, ia->ia_memt, 1);
               else
                       panic("pcdisplay_attach: display disappeared");
       }
       sc->sc_dc = dc;

#if NPCWEASEL > 0
       /*
        * If the display is monochrome, check to see if we have
        * a PC-Weasel, and initialize its special features.
        */
       if (dc->mono) {
               sc->sc_weasel.wh_st = dc->dc_ph.ph_memt;
               sc->sc_weasel.wh_sh = dc->dc_ph.ph_memh;
               sc->sc_weasel.wh_parent = self;
               weasel_isa_init(&sc->sc_weasel);
       }
#endif /* NPCWEASEL > 0 */

       aa.console = console;
       aa.scrdata = &pcdisplay_screenlist;
       aa.accessops = &pcdisplay_accessops;
       aa.accesscookie = sc;

       config_found(self, &aa, wsemuldisplaydevprint, CFARGS_NONE);
}


int
pcdisplay_cnattach(bus_space_tag_t iot, bus_space_tag_t memt)
{
       int mono;

       if (pcdisplay_probe_col(iot, memt))
               mono = 0;
       else if (pcdisplay_probe_mono(iot, memt))
               mono = 1;
       else
               return (ENXIO);

       pcdisplay_init(&pcdisplay_console_dc, iot, memt, mono);

       wsdisplay_cnattach(&pcdisplay_scr, &pcdisplay_console_dc,
                          pcdisplay_console_dc.pcs.cursorcol,
                          pcdisplay_console_dc.pcs.cursorrow,
                          FG_LIGHTGREY | BG_BLACK);

       pcdisplayconsole = 1;
       return (0);
}

static int
pcdisplay_is_console(bus_space_tag_t iot)
{
       if (pcdisplayconsole &&
           !pcdisplay_console_attached &&
           bus_space_is_equal(iot, pcdisplay_console_dc.dc_ph.ph_iot))
               return (1);
       return (0);
}

static int
pcdisplay_ioctl(void *v, void *vs, u_long cmd,
   void *data, int flag, struct lwp *l)
{
       /*
        * XXX "do something!"
        */
       return (EPASSTHROUGH);
}

static paddr_t
pcdisplay_mmap(void *v, void *vs, off_t offset, int prot)
{
       return (-1);
}

static int
pcdisplay_alloc_screen(void *v, const struct wsscreen_descr *type,
   void **cookiep, int *curxp, int *curyp, long *defattrp)
{
       struct pcdisplay_softc *sc = v;

       if (sc->nscreens > 0)
               return (ENOMEM);

       *cookiep = sc->sc_dc;
       *curxp = 0;
       *curyp = 0;
       *defattrp = FG_LIGHTGREY | BG_BLACK;
       sc->nscreens++;
       return (0);
}

static void
pcdisplay_free_screen(void *v, void *cookie)
{
       struct pcdisplay_softc *sc = v;

       if (sc->sc_dc == &pcdisplay_console_dc)
               panic("pcdisplay_free_screen: console");

       sc->nscreens--;
}

static int
pcdisplay_show_screen(void *v, void *cookie, int waitok,
   void (*cb)(void *, int, int), void *cbarg)
{
#ifdef DIAGNOSTIC
       struct pcdisplay_softc *sc = v;

       if (cookie != sc->sc_dc)
               panic("pcdisplay_show_screen: bad screen");
#endif
       return (0);
}

static int
pcdisplay_allocattr(void *id, int fg, int bg, int flags, long *attrp)
{
       if (flags & WSATTR_REVERSE)
               *attrp = FG_BLACK | BG_LIGHTGREY;
       else
               *attrp = FG_LIGHTGREY | BG_BLACK;
       return (0);
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.