/*      $NetBSD: pci_vga.c,v 1.21 2023/05/06 21:34:39 andvar Exp $      */

/*
 * Copyright (c) 1999 Leo Weppelman.  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: pci_vga.c,v 1.21 2023/05/06 21:34:39 andvar Exp $");

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <atari/pci/pci_vga.h>
#include <atari/dev/grf_etreg.h>
#include <atari/include/iomap.h>

#include <atari/dev/font.h>

#include "vga_pci.h"
#if NVGA_PCI > 0
#include <dev/cons.h>
#include <dev/ic/mc6845reg.h>
#include <dev/ic/pcdisplayvar.h>
#include <dev/ic/vgareg.h>
#include <dev/ic/vgavar.h>
#endif

static void loadfont(volatile uint8_t *, uint8_t *fb);

/* XXX: Shouldn't these be in font.h???? */
extern font_info        font_info_8x8;
extern font_info        font_info_8x16;

/* Console colors */
/* attribute controller registers */
static const uint8_t vga_atc[] = {
        0x00,   /* 00: internal palette  0 */
        0x01,   /* 01: internal palette  1 */
        0x02,   /* 02: internal palette  2 */
        0x03,   /* 03: internal palette  3 */
        0x04,   /* 04: internal palette  4 */
        0x05,   /* 05: internal palette  5 */
        0x14,   /* 06: internal palette  6 */
        0x07,   /* 07: internal palette  7 */
        0x38,   /* 08: internal palette  8 */
        0x39,   /* 09: internal palette  9 */
        0x3a,   /* 0A: internal palette 10 */
        0x3b,   /* 0B: internal palette 11 */
        0x3c,   /* 0C: internal palette 12 */
        0x3d,   /* 0D: internal palette 13 */
        0x3e,   /* 0E: internal palette 14 */
        0x3f,   /* 0F: internal palette 15 */
        0x0c,   /* 10: attribute mode control */
        0x00,   /* 11: overscan color */
        0x0f,   /* 12: color plane enable */
        0x08,   /* 13: horizontal PEL panning */
        0x00    /* 14: color select */
};

/* video DAC palette registers */
/* XXX only set up 16 colors used by internal palette in ATC registers */
static const uint8_t vga_dacpal[] = {
        /* R     G     B */
        0x00, 0x00, 0x00,       /* BLACK        */
        0x00, 0x00, 0x2a,       /* BLUE         */
        0x00, 0x2a, 0x00,       /* GREEN        */
        0x00, 0x2a, 0x2a,       /* CYAN         */
        0x2a, 0x00, 0x00,       /* RED          */
        0x2a, 0x00, 0x2a,       /* MAGENTA      */
        0x2a, 0x15, 0x00,       /* BROWN        */
        0x2a, 0x2a, 0x2a,       /* LIGHTGREY    */
        0x15, 0x15, 0x15,       /* DARKGREY     */
        0x15, 0x15, 0x3f,       /* LIGHTBLUE    */
        0x15, 0x3f, 0x15,       /* LIGHTGREEN   */
        0x15, 0x3f, 0x3f,       /* LIGHTCYAN    */
        0x3f, 0x15, 0x15,       /* LIGHTRED     */
        0x3f, 0x15, 0x3f,       /* LIGHTMAGENTA */
        0x3f, 0x3f, 0x15,       /* YELLOW       */
        0x3f, 0x3f, 0x3f        /* WHITE        */
};

static bus_space_tag_t  vga_iot, vga_memt;
static int              tags_valid = 0;

#define         VGA_REG_SIZE    (8*1024)
#define         VGA_FB_SIZE     (32*1024)

/*
 * Go look for a VGA card on the PCI-bus. This search is a
 * stripped down version of the PCI-probe. It only looks on
 * bus0 for VGA cards. The first card found is used.
 */
int
check_for_vga(bus_space_tag_t iot, bus_space_tag_t memt)
{
        pci_chipset_tag_t       pc = NULL; /* XXX */
        bus_space_handle_t      ioh_regs, memh_fb;
        pcitag_t                tag;
        int                     device, found, maxndevs, i;
        int                     got_ioh, got_memh, rv;
        uint32_t                id, class;
        volatile uint8_t        *regs;
        uint8_t                 *fb;
        const char              *nbd = "NetBSD/Atari";

        found    = 0;
        tag      = 0;
        id       = 0;
        rv       = 0;
        got_ioh  = 0;
        got_memh = 0;
        maxndevs = pci_bus_maxdevs(pc, 0);

        /*
         * Map 8Kb of registers and 32Kb frame buffer.
         * XXX: The way the registers are mapped here is plain wrong.
         *      We should try to pin-point the region down to 3[bcd]0 (see
         *      .../dev/ic/vga.c).
         */
        if (bus_space_map(iot, 0, VGA_REG_SIZE, 0, &ioh_regs))
                return 0;
        got_ioh = 1;

        if (bus_space_map(memt, 0xa0000, VGA_FB_SIZE, 0, &memh_fb))
                goto bad;
        got_memh = 1;
        regs = bus_space_vaddr(iot, ioh_regs);
        fb   = bus_space_vaddr(memt, memh_fb);

        for (device = 0; !found && (device < maxndevs); device++) {

                tag = pci_make_tag(pc, 0, device, 0);
                id  = pci_conf_read(pc, tag, PCI_ID_REG);
                if (id == 0 || id == 0xffffffff)
                        continue;

                /*
                 * Check if we have some display device here...
                 */
                class = pci_conf_read(pc, tag, PCI_CLASS_REG);
                i = 0;
                if (PCI_CLASS(class) == PCI_CLASS_PREHISTORIC &&
                    PCI_SUBCLASS(class) == PCI_SUBCLASS_PREHISTORIC_VGA)
                        i = 1;
                if (PCI_CLASS(class) == PCI_CLASS_DISPLAY &&
                    PCI_SUBCLASS(class) == PCI_SUBCLASS_DISPLAY_VGA)
                        i = 1;
                if (i == 0)
                        continue;

#if _MILANHW_
                /* Don't need to be more specific */
                milan_vga_init(pc, tag, id, regs, fb);
                found = 1;
#else
                switch (id = PCI_PRODUCT(id)) {

                        /*
                         * XXX Make the inclusion of the cases dependent
                         *     on config options!
                         */
                        case PCI_PRODUCT_TSENG_ET6000:
                        case PCI_PRODUCT_TSENG_ET4000_W32P_A:
                        case PCI_PRODUCT_TSENG_ET4000_W32P_B:
                        case PCI_PRODUCT_TSENG_ET4000_W32P_C:
                        case PCI_PRODUCT_TSENG_ET4000_W32P_D:
                                tseng_init(pc, tag, id, regs, fb);
                                found = 1;
                                break;
                        case PCI_PRODUCT_ATI_RAGE_PRO_PCI_P:
                                ati_vga_init(pc, tag, id, regs, fb);
                                found = 1;
                                break;
                        default:
                                break;
                }
#endif /* _MILANHW_ */
        }
        if (!found)
                goto bad;

        /*
         * Assume the device is in CGA mode. Wscons expects this too...
         */
        bus_space_unmap(memt, memh_fb, VGA_FB_SIZE);
        if (bus_space_map(memt, 0xb8000, VGA_FB_SIZE, 0, &memh_fb)) {
                got_memh = 0;
                goto bad;
        }
        fb = bus_space_vaddr(memt, memh_fb);

        /*
         * Generic parts of the initialization...
         */

        /* set ATC registers */
        for (i = 0; i < 21; i++)
                WAttr(regs, i, vga_atc[i]);

        /* set DAC palette */
        for (i = 0; i < 16; i++) {
                vgaw(regs, VDAC_ADDRESS_W, vga_atc[i]);
                vgaw(regs, VDAC_DATA, vga_dacpal[i * 3 + 0]);
                vgaw(regs, VDAC_DATA, vga_dacpal[i * 3 + 1]);
                vgaw(regs, VDAC_DATA, vga_dacpal[i * 3 + 2]);
        }

        loadfont(regs, fb);
#if NVGA_PCI > 0
        /* use explicit WSDISPLAY_FONTENC_IBM font that MI vga(4) assumes */
        vga_no_builtinfont = 1;
#endif

        /*
         * Clear the screen and print a message. The latter
         * is of diagnostic/debug use only.
         */
        for (i = 50 * 80; i >= 0; i -= 2) {
                fb[i] = 0x20; fb[i+1] = 0x07;
        }
        for (i = 56; *nbd; i += 2)
                fb[i] = *nbd++;

        rv = 1;
        vga_iot  = iot;
        vga_memt = memt;
        rv = tags_valid = 1;

 bad:
        if (got_memh)
                bus_space_unmap(memt, memh_fb, VGA_FB_SIZE);
        if (got_ioh)
                bus_space_unmap(iot, ioh_regs, VGA_REG_SIZE);
        return rv;
}

#if NVGA_PCI > 0
void vgacnprobe(struct consdev *);
void vgacninit(struct consdev *);

void
vgacnprobe(struct consdev *cp)
{

        if (tags_valid)
                cp->cn_pri = CN_NORMAL;
}

void
vgacninit(struct consdev *cp)
{

        if (tags_valid) {
                /* XXX: Are those arguments correct? Leo */
                vga_cnattach(vga_iot, vga_memt, 8, 0);
        }
}
#endif /* NVGA_PCI */

/*
 * Generic VGA. Load the configured kernel font into the videomemory and
 * place the card into textmode.
 */
static void
loadfont(volatile uint8_t *ba, uint8_t *fb)
        /* ba:   Register area KVA */
        /* fb:   Frame buffer KVA  */
{
        font_info       *fd;
        uint8_t         *c, *f, tmp;
        uint16_t        z, y;

#if defined(KFONT_8X8)
        fd = &font_info_8x8;
#else
        fd = &font_info_8x16;
#endif

        WAttr(ba, 0x20 | ACT_ID_ATTR_MODE_CNTL, 0x0a);
        WSeq(ba, SEQ_ID_MAP_MASK,        0x04);
        WSeq(ba, SEQ_ID_MEMORY_MODE,     0x06);
        WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x02);
        WGfx(ba, GCT_ID_GRAPHICS_MODE,   0x00);
        WGfx(ba, GCT_ID_MISC,            0x0c);

        /*
         * load text font into beginning of display memory. Each
         * character cell is 32 bytes long (enough for 4 planes)
         */
        for (z = 0, c = fb; z < 256 * 32; z++)
                *c++ = 0;

        c = (uint8_t *)(fb) + (32 * fd->font_lo);
        f = fd->font_p;
        z = fd->font_lo;
        for (; z <= fd->font_hi; z++, c += (32 - fd->height))
                for (y = 0; y < fd->height; y++) {
                        *c++ = *f++;
                }

        /*
         * Odd/Even addressing
         */
        WSeq(ba, SEQ_ID_MAP_MASK,        0x03);
        WSeq(ba, SEQ_ID_MEMORY_MODE,     0x03);
        WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x00);
        WGfx(ba, GCT_ID_GRAPHICS_MODE,   0x10);
        WGfx(ba, GCT_ID_MISC,            0x0e);

        /*
         * Font height + underline location
         */
        tmp = RCrt(ba, CRT_ID_MAX_ROW_ADDRESS) & 0xe0;
        WCrt(ba, CRT_ID_MAX_ROW_ADDRESS, tmp | (fd->height - 1));
        tmp = RCrt(ba, CRT_ID_UNDERLINE_LOC)   & 0xe0;
        WCrt(ba, CRT_ID_UNDERLINE_LOC,   tmp | (fd->height - 1));

        /*
         * Cursor setup
         */
        WCrt(ba, CRT_ID_CURSOR_START   , 0x00);
        WCrt(ba, CRT_ID_CURSOR_END     , fd->height - 1);
        WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
        WCrt(ba, CRT_ID_CURSOR_LOC_LOW , 0x00);

        /*
         * Enter text mode
         */
        WCrt(ba, CRT_ID_MODE_CONTROL   , 0xa3);
        WAttr(ba, ACT_ID_ATTR_MODE_CNTL | 0x20, 0x0a);
}