From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/video/console/newport_con.c | 745 ++++++++++++++++++++++++++++++++++++
 1 file changed, 745 insertions(+)
 create mode 100644 drivers/video/console/newport_con.c

(limited to 'drivers/video/console/newport_con.c')

diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
new file mode 100644
index 000000000..d9c682ae0
--- /dev/null
+++ b/drivers/video/console/newport_con.c
@@ -0,0 +1,745 @@
+// 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_SGI_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_SGI_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, int 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, int sy, int sx, int height,
+			  int width)
+{
+	int xend = ((sx + width) << 3) - 1;
+	int ystart = ((sy << 4) + topscan) & 0x3ff;
+	int yend = (((sy + height) << 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, int charattr, int ypos,
+			 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 unsigned short *s,
+			  int count, int ypos, int xpos)
+{
+	int i;
+	int charattr;
+	unsigned char *p;
+
+	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, int mode)
+{
+	unsigned short treg;
+	int xcurs, ycurs;
+
+	switch (mode) {
+	case CM_ERASE:
+		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
+		newport_vc2_set(npregs, VC2_IREG_CONTROL,
+				(treg & ~(VC2_CTRL_ECDISP)));
+		break;
+
+	case CM_MOVE:
+	case CM_DRAW:
+		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
+		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 int 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 1;
+}
+
+static int newport_blank(struct vc_data *c, int blank, int mode_switch)
+{
+	unsigned short treg;
+
+	if (blank == 0) {
+		/* 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 1;
+}
+
+static int newport_set_font(int unit, struct console_font *op)
+{
+	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)
+	    || (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, char *name)
+{
+	return newport_set_def_font(vc->vc_num, op);
+}
+
+static int newport_font_set(struct vc_data *vc, struct console_font *font, unsigned flags)
+{
+	return newport_set_font(vc->vc_num, font);
+}
+
+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_LICENSE("GPL");
-- 
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