// SPDX-License-Identifier: GPL-2.0-only
/*
 * newport_con.c: Abscon for newport hardware
 * 
 * (C) 1998 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
 * (C) 1999 Ulf Carlsson (ulfc@thepuffingruop.com)
 * 
 * This driver is based on sgicons.c and cons_newport.
 * 
 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/kd.h>
#include <linux/selection.h>
#include <linux/console.h>
#include <linux/vt_kern.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <asm/io.h>
#include <linux/uaccess.h>
#include <asm/page.h>
#include <asm/gio_device.h>

#include <video/newport.h>

#include <linux/linux_logo.h>
#include <linux/font.h>

#define NEWPORT_LEN     0x10000

#define FONT_DATA ((unsigned char *)font_vga_8x16.data)

static unsigned char *font_data[MAX_NR_CONSOLES];

static struct newport_regs *npregs;
static unsigned long newport_addr;

static int logo_active;
static int topscan;
static int xcurs_correction = 29;
static int newport_xsize;
static int newport_ysize;
static int newport_has_init;

static int newport_set_def_font(int unit, struct console_font *op);

#define BMASK(c) (c << 24)

#define RENDER(regs, cp) do { \
(regs)->go.zpattern = BMASK((cp)[0x0]); (regs)->go.zpattern = BMASK((cp)[0x1]); \
(regs)->go.zpattern = BMASK((cp)[0x2]); (regs)->go.zpattern = BMASK((cp)[0x3]); \
(regs)->go.zpattern = BMASK((cp)[0x4]); (regs)->go.zpattern = BMASK((cp)[0x5]); \
(regs)->go.zpattern = BMASK((cp)[0x6]); (regs)->go.zpattern = BMASK((cp)[0x7]); \
(regs)->go.zpattern = BMASK((cp)[0x8]); (regs)->go.zpattern = BMASK((cp)[0x9]); \
(regs)->go.zpattern = BMASK((cp)[0xa]); (regs)->go.zpattern = BMASK((cp)[0xb]); \
(regs)->go.zpattern = BMASK((cp)[0xc]); (regs)->go.zpattern = BMASK((cp)[0xd]); \
(regs)->go.zpattern = BMASK((cp)[0xe]); (regs)->go.zpattern = BMASK((cp)[0xf]); \
} while(0)

#define TESTVAL 0xdeadbeef
#define XSTI_TO_FXSTART(val) (((val) & 0xffff) << 11)

static inline void newport_render_background(int xstart, int ystart,
                                             int xend, int yend, int ci)
{
        newport_wait(npregs);
        npregs->set.wrmask = 0xffffffff;
        npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
                                 NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
                                 | NPORT_DMODE0_STOPY);
        npregs->set.colori = ci;
        npregs->set.xystarti =
            (xstart << 16) | ((ystart + topscan) & 0x3ff);
        npregs->go.xyendi =
            ((xend + 7) << 16) | ((yend + topscan + 15) & 0x3ff);
}

static inline void newport_init_cmap(void)
{
        unsigned short i;

        for (i = 0; i < 16; i++) {
                newport_bfwait(npregs);
                newport_cmap_setaddr(npregs, color_table[i]);
                newport_cmap_setrgb(npregs,
                                    default_red[i],
                                    default_grn[i], default_blu[i]);
        }
}

static const struct linux_logo *newport_show_logo(void)
{
#ifdef CONFIG_LOGO_LINUX_CLUT224
        const struct linux_logo *logo = fb_find_logo(8);
        const unsigned char *clut;
        const unsigned char *data;
        unsigned long i;

        if (!logo)
                return NULL;
        clut = logo->clut;
        data = logo->data;

        for (i = 0; i < logo->clutsize; i++) {
                newport_bfwait(npregs);
                newport_cmap_setaddr(npregs, i + 0x20);
                newport_cmap_setrgb(npregs, clut[0], clut[1], clut[2]);
                clut += 3;
        }

        newport_wait(npregs);
        npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
                                 NPORT_DMODE0_CHOST);

        npregs->set.xystarti = ((newport_xsize - logo->width) << 16) | (0);
        npregs->set.xyendi = ((newport_xsize - 1) << 16);
        newport_wait(npregs);

        for (i = 0; i < logo->width*logo->height; i++)
                npregs->go.hostrw0 = *data++ << 24;

        return logo;
#else
        return NULL;
#endif /* CONFIG_LOGO_LINUX_CLUT224 */
}

static inline void newport_clear_screen(int xstart, int ystart, int xend,
                                        int yend, int ci)
{
        if (logo_active)
                return;

        newport_wait(npregs);
        npregs->set.wrmask = 0xffffffff;
        npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
                                 NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
                                 | NPORT_DMODE0_STOPY);
        npregs->set.colori = ci;
        npregs->set.xystarti = (xstart << 16) | ystart;
        npregs->go.xyendi = (xend << 16) | yend;
}

static inline void newport_clear_lines(int ystart, int yend, int ci)
{
        ystart = ((ystart << 4) + topscan) & 0x3ff;
        yend = ((yend << 4) + topscan + 15) & 0x3ff;
        newport_clear_screen(0, ystart, 1280 + 63, yend, ci);
}

static void newport_reset(void)
{
        unsigned short treg;
        int i;

        newport_wait(npregs);
        treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
        newport_vc2_set(npregs, VC2_IREG_CONTROL,
                        (treg | VC2_CTRL_EVIDEO));

        treg = newport_vc2_get(npregs, VC2_IREG_CENTRY);
        newport_vc2_set(npregs, VC2_IREG_RADDR, treg);
        npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
                               NPORT_DMODE_W2 | VC2_PROTOCOL);
        for (i = 0; i < 128; i++) {
                newport_bfwait(npregs);
                if (i == 92 || i == 94)
                        npregs->set.dcbdata0.byshort.s1 = 0xff00;
                else
                        npregs->set.dcbdata0.byshort.s1 = 0x0000;
        }

        newport_init_cmap();

        /* turn off popup plane */
        npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
                               XM9_CRS_CONFIG | NPORT_DMODE_W1);
        npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
        npregs->set.dcbmode = (DCB_XMAP1 | R_DCB_XMAP9_PROTOCOL |
                               XM9_CRS_CONFIG | NPORT_DMODE_W1);
        npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;

        topscan = 0;
        npregs->cset.topscan = 0x3ff;
        npregs->cset.xywin = (4096 << 16) | 4096;

        /* Clear the screen. */
        newport_clear_screen(0, 0, 1280 + 63, 1024, 0);
}

/*
 * calculate the actual screen size by reading
 * the video timing out of the VC2
 */
static void newport_get_screensize(void)
{
        int i, cols;
        unsigned short ventry, treg;
        unsigned short linetable[128];  /* should be enough */

        ventry = newport_vc2_get(npregs, VC2_IREG_VENTRY);
        newport_vc2_set(npregs, VC2_IREG_RADDR, ventry);
        npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
                               NPORT_DMODE_W2 | VC2_PROTOCOL);
        for (i = 0; i < 128; i++) {
                newport_bfwait(npregs);
                linetable[i] = npregs->set.dcbdata0.byshort.s1;
        }

        newport_xsize = newport_ysize = 0;
        for (i = 0; i < ARRAY_SIZE(linetable) - 1 && linetable[i + 1]; i += 2) {
                cols = 0;
                newport_vc2_set(npregs, VC2_IREG_RADDR, linetable[i]);
                npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
                                       NPORT_DMODE_W2 | VC2_PROTOCOL);
                do {
                        newport_bfwait(npregs);
                        treg = npregs->set.dcbdata0.byshort.s1;
                        if ((treg & 1) == 0)
                                cols += (treg >> 7) & 0xfe;
                        if ((treg & 0x80) == 0) {
                                newport_bfwait(npregs);
                                treg = npregs->set.dcbdata0.byshort.s1;
                        }
                } while ((treg & 0x8000) == 0);
                if (cols) {
                        if (cols > newport_xsize)
                                newport_xsize = cols;
                        newport_ysize += linetable[i + 1];
                }
        }
        printk("NG1: Screensize %dx%d\n", newport_xsize, newport_ysize);
}

static void newport_get_revisions(void)
{
        unsigned int tmp;
        unsigned int board_rev;
        unsigned int rex3_rev;
        unsigned int vc2_rev;
        unsigned int cmap_rev;
        unsigned int xmap9_rev;
        unsigned int bt445_rev;
        unsigned int bitplanes;

        rex3_rev = npregs->cset.status & NPORT_STAT_VERS;

        npregs->set.dcbmode = (DCB_CMAP0 | NCMAP_PROTOCOL |
                               NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
        tmp = npregs->set.dcbdata0.bybytes.b3;
        cmap_rev = tmp & 7;
        board_rev = (tmp >> 4) & 7;
        bitplanes = ((board_rev > 1) && (tmp & 0x80)) ? 8 : 24;

        npregs->set.dcbmode = (DCB_CMAP1 | NCMAP_PROTOCOL |
                               NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
        tmp = npregs->set.dcbdata0.bybytes.b3;
        if ((tmp & 7) < cmap_rev)
                cmap_rev = (tmp & 7);

        vc2_rev = (newport_vc2_get(npregs, VC2_IREG_CONFIG) >> 5) & 7;

        npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
                               XM9_CRS_REVISION | NPORT_DMODE_W1);
        xmap9_rev = npregs->set.dcbdata0.bybytes.b3 & 7;

        npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
                               BT445_CSR_ADDR_REG | NPORT_DMODE_W1);
        npregs->set.dcbdata0.bybytes.b3 = BT445_REVISION_REG;
        npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
                               BT445_CSR_REVISION | NPORT_DMODE_W1);
        bt445_rev = (npregs->set.dcbdata0.bybytes.b3 >> 4) - 0x0a;

#define L(a)     (char)('A'+(a))
        printk
            ("NG1: Revision %d, %d bitplanes, REX3 revision %c, VC2 revision %c, xmap9 revision %c, cmap revision %c, bt445 revision %c\n",
             board_rev, bitplanes, L(rex3_rev), L(vc2_rev), L(xmap9_rev),
             L(cmap_rev ? (cmap_rev + 1) : 0), L(bt445_rev));
#undef L

        if (board_rev == 3)     /* I don't know all affected revisions */
                xcurs_correction = 21;
}

static void newport_exit(void)
{
        int i;

        /* free memory used by user font */
        for (i = 0; i < MAX_NR_CONSOLES; i++)
                newport_set_def_font(i, NULL);
}

/* Can't be __init, do_take_over_console may call it later */
static const char *newport_startup(void)
{
        int i;

        npregs->cset.config = NPORT_CFG_GD0;

        if (newport_wait(npregs))
                goto out_unmap;

        npregs->set.xstarti = TESTVAL;
        if (npregs->set._xstart.word != XSTI_TO_FXSTART(TESTVAL))
                goto out_unmap;

        for (i = 0; i < MAX_NR_CONSOLES; i++)
                font_data[i] = FONT_DATA;

        newport_reset();
        newport_get_revisions();
        newport_get_screensize();
        newport_has_init = 1;

        return "SGI Newport";

out_unmap:
        return NULL;
}

static void newport_init(struct vc_data *vc, bool init)
{
        int cols, rows;

        cols = newport_xsize / 8;
        rows = newport_ysize / 16;
        vc->vc_can_do_color = 1;
        if (init) {
                vc->vc_cols = cols;
                vc->vc_rows = rows;
        } else
                vc_resize(vc, cols, rows);
}

static void newport_deinit(struct vc_data *c)
{
        if (!con_is_bound(&newport_con) && newport_has_init) {
                newport_exit();
                newport_has_init = 0;
        }
}

static void newport_clear(struct vc_data *vc, unsigned int sy, unsigned int sx,
                          unsigned int width)
{
        int xend = ((sx + width) << 3) - 1;
        int ystart = ((sy << 4) + topscan) & 0x3ff;
        int yend = (((sy + 1) << 4) + topscan - 1) & 0x3ff;

        if (logo_active)
                return;

        if (ystart < yend) {
                newport_clear_screen(sx << 3, ystart, xend, yend,
                                     (vc->state.color & 0xf0) >> 4);
        } else {
                newport_clear_screen(sx << 3, ystart, xend, 1023,
                                     (vc->state.color & 0xf0) >> 4);
                newport_clear_screen(sx << 3, 0, xend, yend,
                                     (vc->state.color & 0xf0) >> 4);
        }
}

static void newport_putc(struct vc_data *vc, u16 charattr, unsigned int ypos,
                         unsigned int xpos)
{
        unsigned char *p;

        p = &font_data[vc->vc_num][(charattr & 0xff) << 4];
        charattr = (charattr >> 8) & 0xff;
        xpos <<= 3;
        ypos <<= 4;

        newport_render_background(xpos, ypos, xpos, ypos,
                                  (charattr & 0xf0) >> 4);

        /* Set the color and drawing mode. */
        newport_wait(npregs);
        npregs->set.colori = charattr & 0xf;
        npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
                                 NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
                                 NPORT_DMODE0_L32);

        /* Set coordinates for bitmap operation. */
        npregs->set.xystarti = (xpos << 16) | ((ypos + topscan) & 0x3ff);
        npregs->set.xyendi = ((xpos + 7) << 16);
        newport_wait(npregs);

        /* Go, baby, go... */
        RENDER(npregs, p);
}

static void newport_putcs(struct vc_data *vc, const u16 *s,
                          unsigned int count, unsigned int ypos,
                          unsigned int xpos)
{
        unsigned char *p;
        unsigned int i;
        u16 charattr;

        charattr = (scr_readw(s) >> 8) & 0xff;

        xpos <<= 3;
        ypos <<= 4;

        if (!logo_active)
                /* Clear the area behing the string */
                newport_render_background(xpos, ypos,
                                          xpos + ((count - 1) << 3), ypos,
                                          (charattr & 0xf0) >> 4);

        newport_wait(npregs);

        /* Set the color and drawing mode. */
        npregs->set.colori = charattr & 0xf;
        npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
                                 NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
                                 NPORT_DMODE0_L32);

        for (i = 0; i < count; i++, xpos += 8) {
                p = &font_data[vc->vc_num][(scr_readw(s++) & 0xff) << 4];

                newport_wait(npregs);

                /* Set coordinates for bitmap operation. */
                npregs->set.xystarti =
                    (xpos << 16) | ((ypos + topscan) & 0x3ff);
                npregs->set.xyendi = ((xpos + 7) << 16);

                /* Go, baby, go... */
                RENDER(npregs, p);
        }
}

static void newport_cursor(struct vc_data *vc, bool enable)
{
        unsigned short treg;
        int xcurs, ycurs;

        treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);

        if (!enable) {
                newport_vc2_set(npregs, VC2_IREG_CONTROL,
                                (treg & ~(VC2_CTRL_ECDISP)));
                return;
        }

        newport_vc2_set(npregs, VC2_IREG_CONTROL, (treg | VC2_CTRL_ECDISP));
        xcurs = (vc->vc_pos - vc->vc_visible_origin) / 2;
        ycurs = ((xcurs / vc->vc_cols) << 4) + 31;
        xcurs = ((xcurs % vc->vc_cols) << 3) + xcurs_correction;
        newport_vc2_set(npregs, VC2_IREG_CURSX, xcurs);
        newport_vc2_set(npregs, VC2_IREG_CURSY, ycurs);
}

static bool newport_switch(struct vc_data *vc)
{
        static int logo_drawn = 0;

        topscan = 0;
        npregs->cset.topscan = 0x3ff;

        if (!logo_drawn) {
                if (newport_show_logo()) {
                        logo_drawn = 1;
                        logo_active = 1;
                }
        }

        return true;
}

static bool newport_blank(struct vc_data *c, enum vesa_blank_mode blank,
                          bool mode_switch)
{
        unsigned short treg;

        if (blank == VESA_NO_BLANKING) {
                /* unblank console */
                treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
                newport_vc2_set(npregs, VC2_IREG_CONTROL,
                                (treg | VC2_CTRL_EDISP));
        } else {
                /* blank console */
                treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
                newport_vc2_set(npregs, VC2_IREG_CONTROL,
                                (treg & ~(VC2_CTRL_EDISP)));
        }

        return true;
}

static int newport_set_font(int unit, const struct console_font *op,
                            unsigned int vpitch)
{
        int w = op->width;
        int h = op->height;
        int size = h * op->charcount;
        int i;
        unsigned char *new_data, *data = op->data, *p;

        /* ladis: when I grow up, there will be a day... and more sizes will
         * be supported ;-) */
        if ((w != 8) || (h != 16) || (vpitch != 32)
            || (op->charcount != 256 && op->charcount != 512))
                return -EINVAL;

        if (!(new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size,
             GFP_USER))) return -ENOMEM;

        new_data += FONT_EXTRA_WORDS * sizeof(int);
        FNTSIZE(new_data) = size;
        FNTCHARCNT(new_data) = op->charcount;
        REFCOUNT(new_data) = 0; /* usage counter */
        FNTSUM(new_data) = 0;

        p = new_data;
        for (i = 0; i < op->charcount; i++) {
                memcpy(p, data, h);
                data += 32;
                p += h;
        }

        /* check if font is already used by other console */
        for (i = 0; i < MAX_NR_CONSOLES; i++) {
                if (font_data[i] != FONT_DATA
                    && FNTSIZE(font_data[i]) == size
                    && !memcmp(font_data[i], new_data, size)) {
                        kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
                        /* current font is the same as the new one */
                        if (i == unit)
                                return 0;
                        new_data = font_data[i];
                        break;
                }
        }
        /* old font is user font */
        if (font_data[unit] != FONT_DATA) {
                if (--REFCOUNT(font_data[unit]) == 0)
                        kfree(font_data[unit] -
                              FONT_EXTRA_WORDS * sizeof(int));
        }
        REFCOUNT(new_data)++;
        font_data[unit] = new_data;

        return 0;
}

static int newport_set_def_font(int unit, struct console_font *op)
{
        if (font_data[unit] != FONT_DATA) {
                if (--REFCOUNT(font_data[unit]) == 0)
                        kfree(font_data[unit] -
                              FONT_EXTRA_WORDS * sizeof(int));
                font_data[unit] = FONT_DATA;
        }

        return 0;
}

static int newport_font_default(struct vc_data *vc, struct console_font *op,
                                const char *name)
{
        return newport_set_def_font(vc->vc_num, op);
}

static int newport_font_set(struct vc_data *vc, const struct console_font *font,
                            unsigned int vpitch, unsigned int flags)
{
        return newport_set_font(vc->vc_num, font, vpitch);
}

static bool newport_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
                enum con_scroll dir, unsigned int lines)
{
        int count, x, y;
        unsigned short *s, *d;
        unsigned short chattr;

        logo_active = 0;        /* it's time to disable the logo now.. */

        if (t == 0 && b == vc->vc_rows) {
                if (dir == SM_UP) {
                        topscan = (topscan + (lines << 4)) & 0x3ff;
                        newport_clear_lines(vc->vc_rows - lines,
                                            vc->vc_rows - 1,
                                            (vc->state.color & 0xf0) >> 4);
                } else {
                        topscan = (topscan + (-lines << 4)) & 0x3ff;
                        newport_clear_lines(0, lines - 1,
                                            (vc->state.color & 0xf0) >> 4);
                }
                npregs->cset.topscan = (topscan - 1) & 0x3ff;
                return false;
        }

        count = (b - t - lines) * vc->vc_cols;
        if (dir == SM_UP) {
                x = 0;
                y = t;
                s = (unsigned short *) (vc->vc_origin +
                                        vc->vc_size_row * (t + lines));
                d = (unsigned short *) (vc->vc_origin +
                                        vc->vc_size_row * t);
                while (count--) {
                        chattr = scr_readw(s++);
                        if (chattr != scr_readw(d)) {
                                newport_putc(vc, chattr, y, x);
                                scr_writew(chattr, d);
                        }
                        d++;
                        if (++x == vc->vc_cols) {
                                x = 0;
                                y++;
                        }
                }
                d = (unsigned short *) (vc->vc_origin +
                                        vc->vc_size_row * (b - lines));
                x = 0;
                y = b - lines;
                for (count = 0; count < (lines * vc->vc_cols); count++) {
                        if (scr_readw(d) != vc->vc_video_erase_char) {
                                newport_putc(vc, vc->vc_video_erase_char,
                                             y, x);
                                scr_writew(vc->vc_video_erase_char, d);
                        }
                        d++;
                        if (++x == vc->vc_cols) {
                                x = 0;
                                y++;
                        }
                }
        } else {
                x = vc->vc_cols - 1;
                y = b - 1;
                s = (unsigned short *) (vc->vc_origin +
                                        vc->vc_size_row * (b - lines) - 2);
                d = (unsigned short *) (vc->vc_origin +
                                        vc->vc_size_row * b - 2);
                while (count--) {
                        chattr = scr_readw(s--);
                        if (chattr != scr_readw(d)) {
                                newport_putc(vc, chattr, y, x);
                                scr_writew(chattr, d);
                        }
                        d--;
                        if (x-- == 0) {
                                x = vc->vc_cols - 1;
                                y--;
                        }
                }
                d = (unsigned short *) (vc->vc_origin +
                                        vc->vc_size_row * t);
                x = 0;
                y = t;
                for (count = 0; count < (lines * vc->vc_cols); count++) {
                        if (scr_readw(d) != vc->vc_video_erase_char) {
                                newport_putc(vc, vc->vc_video_erase_char,
                                             y, x);
                                scr_writew(vc->vc_video_erase_char, d);
                        }
                        d++;
                        if (++x == vc->vc_cols) {
                                x = 0;
                                y++;
                        }
                }
        }
        return true;
}

static void newport_save_screen(struct vc_data *vc) { }

const struct consw newport_con = {
        .owner            = THIS_MODULE,
        .con_startup      = newport_startup,
        .con_init         = newport_init,
        .con_deinit       = newport_deinit,
        .con_clear        = newport_clear,
        .con_putc         = newport_putc,
        .con_putcs        = newport_putcs,
        .con_cursor       = newport_cursor,
        .con_scroll       = newport_scroll,
        .con_switch       = newport_switch,
        .con_blank        = newport_blank,
        .con_font_set     = newport_font_set,
        .con_font_default = newport_font_default,
        .con_save_screen  = newport_save_screen
};

static int newport_probe(struct gio_device *dev,
                         const struct gio_device_id *id)
{
        int err;

        if (!dev->resource.start)
                return -EINVAL;

        if (npregs)
                return -EBUSY; /* we only support one Newport as console */

        newport_addr = dev->resource.start + 0xF0000;
        if (!request_mem_region(newport_addr, NEWPORT_LEN, "Newport"))
                return -ENODEV;

        npregs = (struct newport_regs *)/* ioremap cannot fail */
                ioremap(newport_addr, sizeof(struct newport_regs));
        console_lock();
        err = do_take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
        console_unlock();

        if (err) {
                iounmap((void *)npregs);
                release_mem_region(newport_addr, NEWPORT_LEN);
        }
        return err;
}

static void newport_remove(struct gio_device *dev)
{
        give_up_console(&newport_con);
        iounmap((void *)npregs);
        release_mem_region(newport_addr, NEWPORT_LEN);
}

static struct gio_device_id newport_ids[] = {
        { .id = 0x7e },
        { .id = 0xff }
};

MODULE_ALIAS("gio:7e");

static struct gio_driver newport_driver = {
        .name = "newport",
        .id_table = newport_ids,
        .probe = newport_probe,
        .remove = newport_remove,
};
module_driver(newport_driver, gio_register_driver, gio_unregister_driver);

MODULE_DESCRIPTION("SGI Newport console driver");
MODULE_LICENSE("GPL");