1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * newport_con.c: Abscon for newport hardware
4  *
5  * (C) 1998 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
6  * (C) 1999 Ulf Carlsson (ulfc@thepuffingruop.com)
7  *
8  * This driver is based on sgicons.c and cons_newport.
9  *
10  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
11  * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
12  */
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/kd.h>
17 #include <linux/selection.h>
18 #include <linux/console.h>
19 #include <linux/vt_kern.h>
20 #include <linux/mm.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 
24 #include <asm/io.h>
25 #include <linux/uaccess.h>
26 #include <asm/page.h>
27 #include <asm/gio_device.h>
28 
29 #include <video/newport.h>
30 
31 #include <linux/linux_logo.h>
32 #include <linux/font.h>
33 
34 #define NEWPORT_LEN	0x10000
35 
36 #define FONT_DATA ((unsigned char *)font_vga_8x16.data)
37 
38 static unsigned char *font_data[MAX_NR_CONSOLES];
39 
40 static struct newport_regs *npregs;
41 static unsigned long newport_addr;
42 
43 static int logo_active;
44 static int topscan;
45 static int xcurs_correction = 29;
46 static int newport_xsize;
47 static int newport_ysize;
48 static int newport_has_init;
49 
50 static int newport_set_def_font(int unit, struct console_font *op);
51 
52 #define BMASK(c) (c << 24)
53 
54 #define RENDER(regs, cp) do { \
55 (regs)->go.zpattern = BMASK((cp)[0x0]); (regs)->go.zpattern = BMASK((cp)[0x1]); \
56 (regs)->go.zpattern = BMASK((cp)[0x2]); (regs)->go.zpattern = BMASK((cp)[0x3]); \
57 (regs)->go.zpattern = BMASK((cp)[0x4]); (regs)->go.zpattern = BMASK((cp)[0x5]); \
58 (regs)->go.zpattern = BMASK((cp)[0x6]); (regs)->go.zpattern = BMASK((cp)[0x7]); \
59 (regs)->go.zpattern = BMASK((cp)[0x8]); (regs)->go.zpattern = BMASK((cp)[0x9]); \
60 (regs)->go.zpattern = BMASK((cp)[0xa]); (regs)->go.zpattern = BMASK((cp)[0xb]); \
61 (regs)->go.zpattern = BMASK((cp)[0xc]); (regs)->go.zpattern = BMASK((cp)[0xd]); \
62 (regs)->go.zpattern = BMASK((cp)[0xe]); (regs)->go.zpattern = BMASK((cp)[0xf]); \
63 } while(0)
64 
65 #define TESTVAL 0xdeadbeef
66 #define XSTI_TO_FXSTART(val) (((val) & 0xffff) << 11)
67 
68 static inline void newport_render_background(int xstart, int ystart,
69 					     int xend, int yend, int ci)
70 {
71 	newport_wait(npregs);
72 	npregs->set.wrmask = 0xffffffff;
73 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
74 				 NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
75 				 | NPORT_DMODE0_STOPY);
76 	npregs->set.colori = ci;
77 	npregs->set.xystarti =
78 	    (xstart << 16) | ((ystart + topscan) & 0x3ff);
79 	npregs->go.xyendi =
80 	    ((xend + 7) << 16) | ((yend + topscan + 15) & 0x3ff);
81 }
82 
83 static inline void newport_init_cmap(void)
84 {
85 	unsigned short i;
86 
87 	for (i = 0; i < 16; i++) {
88 		newport_bfwait(npregs);
89 		newport_cmap_setaddr(npregs, color_table[i]);
90 		newport_cmap_setrgb(npregs,
91 				    default_red[i],
92 				    default_grn[i], default_blu[i]);
93 	}
94 }
95 
96 static const struct linux_logo *newport_show_logo(void)
97 {
98 #ifdef CONFIG_LOGO_SGI_CLUT224
99 	const struct linux_logo *logo = fb_find_logo(8);
100 	const unsigned char *clut;
101 	const unsigned char *data;
102 	unsigned long i;
103 
104 	if (!logo)
105 		return NULL;
106 	clut = logo->clut;
107 	data = logo->data;
108 
109 	for (i = 0; i < logo->clutsize; i++) {
110 		newport_bfwait(npregs);
111 		newport_cmap_setaddr(npregs, i + 0x20);
112 		newport_cmap_setrgb(npregs, clut[0], clut[1], clut[2]);
113 		clut += 3;
114 	}
115 
116 	newport_wait(npregs);
117 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
118 				 NPORT_DMODE0_CHOST);
119 
120 	npregs->set.xystarti = ((newport_xsize - logo->width) << 16) | (0);
121 	npregs->set.xyendi = ((newport_xsize - 1) << 16);
122 	newport_wait(npregs);
123 
124 	for (i = 0; i < logo->width*logo->height; i++)
125 		npregs->go.hostrw0 = *data++ << 24;
126 
127 	return logo;
128 #else
129 	return NULL;
130 #endif /* CONFIG_LOGO_SGI_CLUT224 */
131 }
132 
133 static inline void newport_clear_screen(int xstart, int ystart, int xend,
134 					int yend, int ci)
135 {
136 	if (logo_active)
137 		return;
138 
139 	newport_wait(npregs);
140 	npregs->set.wrmask = 0xffffffff;
141 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
142 				 NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
143 				 | NPORT_DMODE0_STOPY);
144 	npregs->set.colori = ci;
145 	npregs->set.xystarti = (xstart << 16) | ystart;
146 	npregs->go.xyendi = (xend << 16) | yend;
147 }
148 
149 static inline void newport_clear_lines(int ystart, int yend, int ci)
150 {
151 	ystart = ((ystart << 4) + topscan) & 0x3ff;
152 	yend = ((yend << 4) + topscan + 15) & 0x3ff;
153 	newport_clear_screen(0, ystart, 1280 + 63, yend, ci);
154 }
155 
156 static void newport_reset(void)
157 {
158 	unsigned short treg;
159 	int i;
160 
161 	newport_wait(npregs);
162 	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
163 	newport_vc2_set(npregs, VC2_IREG_CONTROL,
164 			(treg | VC2_CTRL_EVIDEO));
165 
166 	treg = newport_vc2_get(npregs, VC2_IREG_CENTRY);
167 	newport_vc2_set(npregs, VC2_IREG_RADDR, treg);
168 	npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
169 			       NPORT_DMODE_W2 | VC2_PROTOCOL);
170 	for (i = 0; i < 128; i++) {
171 		newport_bfwait(npregs);
172 		if (i == 92 || i == 94)
173 			npregs->set.dcbdata0.byshort.s1 = 0xff00;
174 		else
175 			npregs->set.dcbdata0.byshort.s1 = 0x0000;
176 	}
177 
178 	newport_init_cmap();
179 
180 	/* turn off popup plane */
181 	npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
182 			       XM9_CRS_CONFIG | NPORT_DMODE_W1);
183 	npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
184 	npregs->set.dcbmode = (DCB_XMAP1 | R_DCB_XMAP9_PROTOCOL |
185 			       XM9_CRS_CONFIG | NPORT_DMODE_W1);
186 	npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
187 
188 	topscan = 0;
189 	npregs->cset.topscan = 0x3ff;
190 	npregs->cset.xywin = (4096 << 16) | 4096;
191 
192 	/* Clear the screen. */
193 	newport_clear_screen(0, 0, 1280 + 63, 1024, 0);
194 }
195 
196 /*
197  * calculate the actual screen size by reading
198  * the video timing out of the VC2
199  */
200 static void newport_get_screensize(void)
201 {
202 	int i, cols;
203 	unsigned short ventry, treg;
204 	unsigned short linetable[128];	/* should be enough */
205 
206 	ventry = newport_vc2_get(npregs, VC2_IREG_VENTRY);
207 	newport_vc2_set(npregs, VC2_IREG_RADDR, ventry);
208 	npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
209 			       NPORT_DMODE_W2 | VC2_PROTOCOL);
210 	for (i = 0; i < 128; i++) {
211 		newport_bfwait(npregs);
212 		linetable[i] = npregs->set.dcbdata0.byshort.s1;
213 	}
214 
215 	newport_xsize = newport_ysize = 0;
216 	for (i = 0; i < ARRAY_SIZE(linetable) - 1 && linetable[i + 1]; i += 2) {
217 		cols = 0;
218 		newport_vc2_set(npregs, VC2_IREG_RADDR, linetable[i]);
219 		npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
220 				       NPORT_DMODE_W2 | VC2_PROTOCOL);
221 		do {
222 			newport_bfwait(npregs);
223 			treg = npregs->set.dcbdata0.byshort.s1;
224 			if ((treg & 1) == 0)
225 				cols += (treg >> 7) & 0xfe;
226 			if ((treg & 0x80) == 0) {
227 				newport_bfwait(npregs);
228 				treg = npregs->set.dcbdata0.byshort.s1;
229 			}
230 		} while ((treg & 0x8000) == 0);
231 		if (cols) {
232 			if (cols > newport_xsize)
233 				newport_xsize = cols;
234 			newport_ysize += linetable[i + 1];
235 		}
236 	}
237 	printk("NG1: Screensize %dx%d\n", newport_xsize, newport_ysize);
238 }
239 
240 static void newport_get_revisions(void)
241 {
242 	unsigned int tmp;
243 	unsigned int board_rev;
244 	unsigned int rex3_rev;
245 	unsigned int vc2_rev;
246 	unsigned int cmap_rev;
247 	unsigned int xmap9_rev;
248 	unsigned int bt445_rev;
249 	unsigned int bitplanes;
250 
251 	rex3_rev = npregs->cset.status & NPORT_STAT_VERS;
252 
253 	npregs->set.dcbmode = (DCB_CMAP0 | NCMAP_PROTOCOL |
254 			       NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
255 	tmp = npregs->set.dcbdata0.bybytes.b3;
256 	cmap_rev = tmp & 7;
257 	board_rev = (tmp >> 4) & 7;
258 	bitplanes = ((board_rev > 1) && (tmp & 0x80)) ? 8 : 24;
259 
260 	npregs->set.dcbmode = (DCB_CMAP1 | NCMAP_PROTOCOL |
261 			       NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
262 	tmp = npregs->set.dcbdata0.bybytes.b3;
263 	if ((tmp & 7) < cmap_rev)
264 		cmap_rev = (tmp & 7);
265 
266 	vc2_rev = (newport_vc2_get(npregs, VC2_IREG_CONFIG) >> 5) & 7;
267 
268 	npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
269 			       XM9_CRS_REVISION | NPORT_DMODE_W1);
270 	xmap9_rev = npregs->set.dcbdata0.bybytes.b3 & 7;
271 
272 	npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
273 			       BT445_CSR_ADDR_REG | NPORT_DMODE_W1);
274 	npregs->set.dcbdata0.bybytes.b3 = BT445_REVISION_REG;
275 	npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
276 			       BT445_CSR_REVISION | NPORT_DMODE_W1);
277 	bt445_rev = (npregs->set.dcbdata0.bybytes.b3 >> 4) - 0x0a;
278 
279 #define L(a)     (char)('A'+(a))
280 	printk
281 	    ("NG1: Revision %d, %d bitplanes, REX3 revision %c, VC2 revision %c, xmap9 revision %c, cmap revision %c, bt445 revision %c\n",
282 	     board_rev, bitplanes, L(rex3_rev), L(vc2_rev), L(xmap9_rev),
283 	     L(cmap_rev ? (cmap_rev + 1) : 0), L(bt445_rev));
284 #undef L
285 
286 	if (board_rev == 3)	/* I don't know all affected revisions */
287 		xcurs_correction = 21;
288 }
289 
290 static void newport_exit(void)
291 {
292 	int i;
293 
294 	/* free memory used by user font */
295 	for (i = 0; i < MAX_NR_CONSOLES; i++)
296 		newport_set_def_font(i, NULL);
297 }
298 
299 /* Can't be __init, do_take_over_console may call it later */
300 static const char *newport_startup(void)
301 {
302 	int i;
303 
304 	npregs->cset.config = NPORT_CFG_GD0;
305 
306 	if (newport_wait(npregs))
307 		goto out_unmap;
308 
309 	npregs->set.xstarti = TESTVAL;
310 	if (npregs->set._xstart.word != XSTI_TO_FXSTART(TESTVAL))
311 		goto out_unmap;
312 
313 	for (i = 0; i < MAX_NR_CONSOLES; i++)
314 		font_data[i] = FONT_DATA;
315 
316 	newport_reset();
317 	newport_get_revisions();
318 	newport_get_screensize();
319 	newport_has_init = 1;
320 
321 	return "SGI Newport";
322 
323 out_unmap:
324 	return NULL;
325 }
326 
327 static void newport_init(struct vc_data *vc, int init)
328 {
329 	int cols, rows;
330 
331 	cols = newport_xsize / 8;
332 	rows = newport_ysize / 16;
333 	vc->vc_can_do_color = 1;
334 	if (init) {
335 		vc->vc_cols = cols;
336 		vc->vc_rows = rows;
337 	} else
338 		vc_resize(vc, cols, rows);
339 }
340 
341 static void newport_deinit(struct vc_data *c)
342 {
343 	if (!con_is_bound(&newport_con) && newport_has_init) {
344 		newport_exit();
345 		newport_has_init = 0;
346 	}
347 }
348 
349 static void newport_clear(struct vc_data *vc, int sy, int sx, int height,
350 			  int width)
351 {
352 	int xend = ((sx + width) << 3) - 1;
353 	int ystart = ((sy << 4) + topscan) & 0x3ff;
354 	int yend = (((sy + height) << 4) + topscan - 1) & 0x3ff;
355 
356 	if (logo_active)
357 		return;
358 
359 	if (ystart < yend) {
360 		newport_clear_screen(sx << 3, ystart, xend, yend,
361 				     (vc->state.color & 0xf0) >> 4);
362 	} else {
363 		newport_clear_screen(sx << 3, ystart, xend, 1023,
364 				     (vc->state.color & 0xf0) >> 4);
365 		newport_clear_screen(sx << 3, 0, xend, yend,
366 				     (vc->state.color & 0xf0) >> 4);
367 	}
368 }
369 
370 static void newport_putc(struct vc_data *vc, int charattr, int ypos,
371 			 int xpos)
372 {
373 	unsigned char *p;
374 
375 	p = &font_data[vc->vc_num][(charattr & 0xff) << 4];
376 	charattr = (charattr >> 8) & 0xff;
377 	xpos <<= 3;
378 	ypos <<= 4;
379 
380 	newport_render_background(xpos, ypos, xpos, ypos,
381 				  (charattr & 0xf0) >> 4);
382 
383 	/* Set the color and drawing mode. */
384 	newport_wait(npregs);
385 	npregs->set.colori = charattr & 0xf;
386 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
387 				 NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
388 				 NPORT_DMODE0_L32);
389 
390 	/* Set coordinates for bitmap operation. */
391 	npregs->set.xystarti = (xpos << 16) | ((ypos + topscan) & 0x3ff);
392 	npregs->set.xyendi = ((xpos + 7) << 16);
393 	newport_wait(npregs);
394 
395 	/* Go, baby, go... */
396 	RENDER(npregs, p);
397 }
398 
399 static void newport_putcs(struct vc_data *vc, const unsigned short *s,
400 			  int count, int ypos, int xpos)
401 {
402 	int i;
403 	int charattr;
404 	unsigned char *p;
405 
406 	charattr = (scr_readw(s) >> 8) & 0xff;
407 
408 	xpos <<= 3;
409 	ypos <<= 4;
410 
411 	if (!logo_active)
412 		/* Clear the area behing the string */
413 		newport_render_background(xpos, ypos,
414 					  xpos + ((count - 1) << 3), ypos,
415 					  (charattr & 0xf0) >> 4);
416 
417 	newport_wait(npregs);
418 
419 	/* Set the color and drawing mode. */
420 	npregs->set.colori = charattr & 0xf;
421 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
422 				 NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
423 				 NPORT_DMODE0_L32);
424 
425 	for (i = 0; i < count; i++, xpos += 8) {
426 		p = &font_data[vc->vc_num][(scr_readw(s++) & 0xff) << 4];
427 
428 		newport_wait(npregs);
429 
430 		/* Set coordinates for bitmap operation. */
431 		npregs->set.xystarti =
432 		    (xpos << 16) | ((ypos + topscan) & 0x3ff);
433 		npregs->set.xyendi = ((xpos + 7) << 16);
434 
435 		/* Go, baby, go... */
436 		RENDER(npregs, p);
437 	}
438 }
439 
440 static void newport_cursor(struct vc_data *vc, int mode)
441 {
442 	unsigned short treg;
443 	int xcurs, ycurs;
444 
445 	switch (mode) {
446 	case CM_ERASE:
447 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
448 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
449 				(treg & ~(VC2_CTRL_ECDISP)));
450 		break;
451 
452 	case CM_MOVE:
453 	case CM_DRAW:
454 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
455 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
456 				(treg | VC2_CTRL_ECDISP));
457 		xcurs = (vc->vc_pos - vc->vc_visible_origin) / 2;
458 		ycurs = ((xcurs / vc->vc_cols) << 4) + 31;
459 		xcurs = ((xcurs % vc->vc_cols) << 3) + xcurs_correction;
460 		newport_vc2_set(npregs, VC2_IREG_CURSX, xcurs);
461 		newport_vc2_set(npregs, VC2_IREG_CURSY, ycurs);
462 	}
463 }
464 
465 static int newport_switch(struct vc_data *vc)
466 {
467 	static int logo_drawn = 0;
468 
469 	topscan = 0;
470 	npregs->cset.topscan = 0x3ff;
471 
472 	if (!logo_drawn) {
473 		if (newport_show_logo()) {
474 			logo_drawn = 1;
475 			logo_active = 1;
476 		}
477 	}
478 
479 	return 1;
480 }
481 
482 static int newport_blank(struct vc_data *c, int blank, int mode_switch)
483 {
484 	unsigned short treg;
485 
486 	if (blank == 0) {
487 		/* unblank console */
488 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
489 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
490 				(treg | VC2_CTRL_EDISP));
491 	} else {
492 		/* blank console */
493 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
494 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
495 				(treg & ~(VC2_CTRL_EDISP)));
496 	}
497 	return 1;
498 }
499 
500 static int newport_set_font(int unit, struct console_font *op, unsigned int vpitch)
501 {
502 	int w = op->width;
503 	int h = op->height;
504 	int size = h * op->charcount;
505 	int i;
506 	unsigned char *new_data, *data = op->data, *p;
507 
508 	/* ladis: when I grow up, there will be a day... and more sizes will
509 	 * be supported ;-) */
510 	if ((w != 8) || (h != 16) || (vpitch != 32)
511 	    || (op->charcount != 256 && op->charcount != 512))
512 		return -EINVAL;
513 
514 	if (!(new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size,
515 	     GFP_USER))) return -ENOMEM;
516 
517 	new_data += FONT_EXTRA_WORDS * sizeof(int);
518 	FNTSIZE(new_data) = size;
519 	FNTCHARCNT(new_data) = op->charcount;
520 	REFCOUNT(new_data) = 0;	/* usage counter */
521 	FNTSUM(new_data) = 0;
522 
523 	p = new_data;
524 	for (i = 0; i < op->charcount; i++) {
525 		memcpy(p, data, h);
526 		data += 32;
527 		p += h;
528 	}
529 
530 	/* check if font is already used by other console */
531 	for (i = 0; i < MAX_NR_CONSOLES; i++) {
532 		if (font_data[i] != FONT_DATA
533 		    && FNTSIZE(font_data[i]) == size
534 		    && !memcmp(font_data[i], new_data, size)) {
535 			kfree(new_data - FONT_EXTRA_WORDS * sizeof(int));
536 			/* current font is the same as the new one */
537 			if (i == unit)
538 				return 0;
539 			new_data = font_data[i];
540 			break;
541 		}
542 	}
543 	/* old font is user font */
544 	if (font_data[unit] != FONT_DATA) {
545 		if (--REFCOUNT(font_data[unit]) == 0)
546 			kfree(font_data[unit] -
547 			      FONT_EXTRA_WORDS * sizeof(int));
548 	}
549 	REFCOUNT(new_data)++;
550 	font_data[unit] = new_data;
551 
552 	return 0;
553 }
554 
555 static int newport_set_def_font(int unit, struct console_font *op)
556 {
557 	if (font_data[unit] != FONT_DATA) {
558 		if (--REFCOUNT(font_data[unit]) == 0)
559 			kfree(font_data[unit] -
560 			      FONT_EXTRA_WORDS * sizeof(int));
561 		font_data[unit] = FONT_DATA;
562 	}
563 
564 	return 0;
565 }
566 
567 static int newport_font_default(struct vc_data *vc, struct console_font *op, char *name)
568 {
569 	return newport_set_def_font(vc->vc_num, op);
570 }
571 
572 static int newport_font_set(struct vc_data *vc, struct console_font *font,
573 			    unsigned int vpitch, unsigned int flags)
574 {
575 	return newport_set_font(vc->vc_num, font, vpitch);
576 }
577 
578 static bool newport_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
579 		enum con_scroll dir, unsigned int lines)
580 {
581 	int count, x, y;
582 	unsigned short *s, *d;
583 	unsigned short chattr;
584 
585 	logo_active = 0;	/* it's time to disable the logo now.. */
586 
587 	if (t == 0 && b == vc->vc_rows) {
588 		if (dir == SM_UP) {
589 			topscan = (topscan + (lines << 4)) & 0x3ff;
590 			newport_clear_lines(vc->vc_rows - lines,
591 					    vc->vc_rows - 1,
592 					    (vc->state.color & 0xf0) >> 4);
593 		} else {
594 			topscan = (topscan + (-lines << 4)) & 0x3ff;
595 			newport_clear_lines(0, lines - 1,
596 					    (vc->state.color & 0xf0) >> 4);
597 		}
598 		npregs->cset.topscan = (topscan - 1) & 0x3ff;
599 		return false;
600 	}
601 
602 	count = (b - t - lines) * vc->vc_cols;
603 	if (dir == SM_UP) {
604 		x = 0;
605 		y = t;
606 		s = (unsigned short *) (vc->vc_origin +
607 					vc->vc_size_row * (t + lines));
608 		d = (unsigned short *) (vc->vc_origin +
609 					vc->vc_size_row * t);
610 		while (count--) {
611 			chattr = scr_readw(s++);
612 			if (chattr != scr_readw(d)) {
613 				newport_putc(vc, chattr, y, x);
614 				scr_writew(chattr, d);
615 			}
616 			d++;
617 			if (++x == vc->vc_cols) {
618 				x = 0;
619 				y++;
620 			}
621 		}
622 		d = (unsigned short *) (vc->vc_origin +
623 					vc->vc_size_row * (b - lines));
624 		x = 0;
625 		y = b - lines;
626 		for (count = 0; count < (lines * vc->vc_cols); count++) {
627 			if (scr_readw(d) != vc->vc_video_erase_char) {
628 				newport_putc(vc, vc->vc_video_erase_char,
629 					     y, x);
630 				scr_writew(vc->vc_video_erase_char, d);
631 			}
632 			d++;
633 			if (++x == vc->vc_cols) {
634 				x = 0;
635 				y++;
636 			}
637 		}
638 	} else {
639 		x = vc->vc_cols - 1;
640 		y = b - 1;
641 		s = (unsigned short *) (vc->vc_origin +
642 					vc->vc_size_row * (b - lines) - 2);
643 		d = (unsigned short *) (vc->vc_origin +
644 					vc->vc_size_row * b - 2);
645 		while (count--) {
646 			chattr = scr_readw(s--);
647 			if (chattr != scr_readw(d)) {
648 				newport_putc(vc, chattr, y, x);
649 				scr_writew(chattr, d);
650 			}
651 			d--;
652 			if (x-- == 0) {
653 				x = vc->vc_cols - 1;
654 				y--;
655 			}
656 		}
657 		d = (unsigned short *) (vc->vc_origin +
658 					vc->vc_size_row * t);
659 		x = 0;
660 		y = t;
661 		for (count = 0; count < (lines * vc->vc_cols); count++) {
662 			if (scr_readw(d) != vc->vc_video_erase_char) {
663 				newport_putc(vc, vc->vc_video_erase_char,
664 					     y, x);
665 				scr_writew(vc->vc_video_erase_char, d);
666 			}
667 			d++;
668 			if (++x == vc->vc_cols) {
669 				x = 0;
670 				y++;
671 			}
672 		}
673 	}
674 	return true;
675 }
676 
677 static void newport_save_screen(struct vc_data *vc) { }
678 
679 const struct consw newport_con = {
680 	.owner		  = THIS_MODULE,
681 	.con_startup	  = newport_startup,
682 	.con_init	  = newport_init,
683 	.con_deinit	  = newport_deinit,
684 	.con_clear	  = newport_clear,
685 	.con_putc	  = newport_putc,
686 	.con_putcs	  = newport_putcs,
687 	.con_cursor	  = newport_cursor,
688 	.con_scroll	  = newport_scroll,
689 	.con_switch	  = newport_switch,
690 	.con_blank	  = newport_blank,
691 	.con_font_set	  = newport_font_set,
692 	.con_font_default = newport_font_default,
693 	.con_save_screen  = newport_save_screen
694 };
695 
696 static int newport_probe(struct gio_device *dev,
697 			 const struct gio_device_id *id)
698 {
699 	int err;
700 
701 	if (!dev->resource.start)
702 		return -EINVAL;
703 
704 	if (npregs)
705 		return -EBUSY; /* we only support one Newport as console */
706 
707 	newport_addr = dev->resource.start + 0xF0000;
708 	if (!request_mem_region(newport_addr, NEWPORT_LEN, "Newport"))
709 		return -ENODEV;
710 
711 	npregs = (struct newport_regs *)/* ioremap cannot fail */
712 		ioremap(newport_addr, sizeof(struct newport_regs));
713 	console_lock();
714 	err = do_take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
715 	console_unlock();
716 
717 	if (err) {
718 		iounmap((void *)npregs);
719 		release_mem_region(newport_addr, NEWPORT_LEN);
720 	}
721 	return err;
722 }
723 
724 static void newport_remove(struct gio_device *dev)
725 {
726 	give_up_console(&newport_con);
727 	iounmap((void *)npregs);
728 	release_mem_region(newport_addr, NEWPORT_LEN);
729 }
730 
731 static struct gio_device_id newport_ids[] = {
732 	{ .id = 0x7e },
733 	{ .id = 0xff }
734 };
735 
736 MODULE_ALIAS("gio:7e");
737 
738 static struct gio_driver newport_driver = {
739 	.name = "newport",
740 	.id_table = newport_ids,
741 	.probe = newport_probe,
742 	.remove = newport_remove,
743 };
744 module_driver(newport_driver, gio_register_driver, gio_unregister_driver);
745 
746 MODULE_LICENSE("GPL");
747