1 /*
2  * newport_con.c: Abscon for newport hardware
3  *
4  * (C) 1998 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
5  * (C) 1999 Ulf Carlsson (ulfc@thepuffingruop.com)
6  *
7  * This driver is based on sgicons.c and cons_newport.
8  *
9  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
10  * Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
11  */
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/kd.h>
16 #include <linux/selection.h>
17 #include <linux/console.h>
18 #include <linux/vt_kern.h>
19 #include <linux/mm.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
22 
23 #include <asm/io.h>
24 #include <linux/uaccess.h>
25 #include <asm/page.h>
26 #include <asm/pgtable.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 FONT_DATA ((unsigned char *)font_vga_8x16.data)
35 
36 /* borrowed from fbcon.c */
37 #define REFCOUNT(fd)	(((int *)(fd))[-1])
38 #define FNTSIZE(fd)	(((int *)(fd))[-2])
39 #define FNTCHARCNT(fd)	(((int *)(fd))[-3])
40 #define FONT_EXTRA_WORDS 3
41 
42 static unsigned char *font_data[MAX_NR_CONSOLES];
43 
44 static struct newport_regs *npregs;
45 
46 static int logo_active;
47 static int topscan;
48 static int xcurs_correction = 29;
49 static int newport_xsize;
50 static int newport_ysize;
51 static int newport_has_init;
52 
53 static int newport_set_def_font(int unit, struct console_font *op);
54 
55 #define BMASK(c) (c << 24)
56 
57 #define RENDER(regs, cp) do { \
58 (regs)->go.zpattern = BMASK((cp)[0x0]); (regs)->go.zpattern = BMASK((cp)[0x1]); \
59 (regs)->go.zpattern = BMASK((cp)[0x2]); (regs)->go.zpattern = BMASK((cp)[0x3]); \
60 (regs)->go.zpattern = BMASK((cp)[0x4]); (regs)->go.zpattern = BMASK((cp)[0x5]); \
61 (regs)->go.zpattern = BMASK((cp)[0x6]); (regs)->go.zpattern = BMASK((cp)[0x7]); \
62 (regs)->go.zpattern = BMASK((cp)[0x8]); (regs)->go.zpattern = BMASK((cp)[0x9]); \
63 (regs)->go.zpattern = BMASK((cp)[0xa]); (regs)->go.zpattern = BMASK((cp)[0xb]); \
64 (regs)->go.zpattern = BMASK((cp)[0xc]); (regs)->go.zpattern = BMASK((cp)[0xd]); \
65 (regs)->go.zpattern = BMASK((cp)[0xe]); (regs)->go.zpattern = BMASK((cp)[0xf]); \
66 } while(0)
67 
68 #define TESTVAL 0xdeadbeef
69 #define XSTI_TO_FXSTART(val) (((val) & 0xffff) << 11)
70 
71 static inline void newport_render_background(int xstart, int ystart,
72 					     int xend, int yend, int ci)
73 {
74 	newport_wait(npregs);
75 	npregs->set.wrmask = 0xffffffff;
76 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
77 				 NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
78 				 | NPORT_DMODE0_STOPY);
79 	npregs->set.colori = ci;
80 	npregs->set.xystarti =
81 	    (xstart << 16) | ((ystart + topscan) & 0x3ff);
82 	npregs->go.xyendi =
83 	    ((xend + 7) << 16) | ((yend + topscan + 15) & 0x3ff);
84 }
85 
86 static inline void newport_init_cmap(void)
87 {
88 	unsigned short i;
89 
90 	for (i = 0; i < 16; i++) {
91 		newport_bfwait(npregs);
92 		newport_cmap_setaddr(npregs, color_table[i]);
93 		newport_cmap_setrgb(npregs,
94 				    default_red[i],
95 				    default_grn[i], default_blu[i]);
96 	}
97 }
98 
99 static const struct linux_logo *newport_show_logo(void)
100 {
101 #ifdef CONFIG_LOGO_SGI_CLUT224
102 	const struct linux_logo *logo = fb_find_logo(8);
103 	const unsigned char *clut;
104 	const unsigned char *data;
105 	unsigned long i;
106 
107 	if (!logo)
108 		return NULL;
109 	clut = logo->clut;
110 	data = logo->data;
111 
112 	for (i = 0; i < logo->clutsize; i++) {
113 		newport_bfwait(npregs);
114 		newport_cmap_setaddr(npregs, i + 0x20);
115 		newport_cmap_setrgb(npregs, clut[0], clut[1], clut[2]);
116 		clut += 3;
117 	}
118 
119 	newport_wait(npregs);
120 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
121 				 NPORT_DMODE0_CHOST);
122 
123 	npregs->set.xystarti = ((newport_xsize - logo->width) << 16) | (0);
124 	npregs->set.xyendi = ((newport_xsize - 1) << 16);
125 	newport_wait(npregs);
126 
127 	for (i = 0; i < logo->width*logo->height; i++)
128 		npregs->go.hostrw0 = *data++ << 24;
129 
130 	return logo;
131 #endif /* CONFIG_LOGO_SGI_CLUT224 */
132 }
133 
134 static inline void newport_clear_screen(int xstart, int ystart, int xend,
135 					int yend, int ci)
136 {
137 	if (logo_active)
138 		return;
139 
140 	newport_wait(npregs);
141 	npregs->set.wrmask = 0xffffffff;
142 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
143 				 NPORT_DMODE0_DOSETUP | NPORT_DMODE0_STOPX
144 				 | NPORT_DMODE0_STOPY);
145 	npregs->set.colori = ci;
146 	npregs->set.xystarti = (xstart << 16) | ystart;
147 	npregs->go.xyendi = (xend << 16) | yend;
148 }
149 
150 static inline void newport_clear_lines(int ystart, int yend, int ci)
151 {
152 	ystart = ((ystart << 4) + topscan) & 0x3ff;
153 	yend = ((yend << 4) + topscan + 15) & 0x3ff;
154 	newport_clear_screen(0, ystart, 1280 + 63, yend, ci);
155 }
156 
157 static void newport_reset(void)
158 {
159 	unsigned short treg;
160 	int i;
161 
162 	newport_wait(npregs);
163 	treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
164 	newport_vc2_set(npregs, VC2_IREG_CONTROL,
165 			(treg | VC2_CTRL_EVIDEO));
166 
167 	treg = newport_vc2_get(npregs, VC2_IREG_CENTRY);
168 	newport_vc2_set(npregs, VC2_IREG_RADDR, treg);
169 	npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
170 			       NPORT_DMODE_W2 | VC2_PROTOCOL);
171 	for (i = 0; i < 128; i++) {
172 		newport_bfwait(npregs);
173 		if (i == 92 || i == 94)
174 			npregs->set.dcbdata0.byshort.s1 = 0xff00;
175 		else
176 			npregs->set.dcbdata0.byshort.s1 = 0x0000;
177 	}
178 
179 	newport_init_cmap();
180 
181 	/* turn off popup plane */
182 	npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
183 			       XM9_CRS_CONFIG | NPORT_DMODE_W1);
184 	npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
185 	npregs->set.dcbmode = (DCB_XMAP1 | R_DCB_XMAP9_PROTOCOL |
186 			       XM9_CRS_CONFIG | NPORT_DMODE_W1);
187 	npregs->set.dcbdata0.bybytes.b3 &= ~XM9_PUPMODE;
188 
189 	topscan = 0;
190 	npregs->cset.topscan = 0x3ff;
191 	npregs->cset.xywin = (4096 << 16) | 4096;
192 
193 	/* Clear the screen. */
194 	newport_clear_screen(0, 0, 1280 + 63, 1024, 0);
195 }
196 
197 /*
198  * calculate the actual screen size by reading
199  * the video timing out of the VC2
200  */
201 static void newport_get_screensize(void)
202 {
203 	int i, cols;
204 	unsigned short ventry, treg;
205 	unsigned short linetable[128];	/* should be enough */
206 
207 	ventry = newport_vc2_get(npregs, VC2_IREG_VENTRY);
208 	newport_vc2_set(npregs, VC2_IREG_RADDR, ventry);
209 	npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
210 			       NPORT_DMODE_W2 | VC2_PROTOCOL);
211 	for (i = 0; i < 128; i++) {
212 		newport_bfwait(npregs);
213 		linetable[i] = npregs->set.dcbdata0.byshort.s1;
214 	}
215 
216 	newport_xsize = newport_ysize = 0;
217 	for (i = 0; i < ARRAY_SIZE(linetable) - 1 && linetable[i + 1]; i += 2) {
218 		cols = 0;
219 		newport_vc2_set(npregs, VC2_IREG_RADDR, linetable[i]);
220 		npregs->set.dcbmode = (NPORT_DMODE_AVC2 | VC2_REGADDR_RAM |
221 				       NPORT_DMODE_W2 | VC2_PROTOCOL);
222 		do {
223 			newport_bfwait(npregs);
224 			treg = npregs->set.dcbdata0.byshort.s1;
225 			if ((treg & 1) == 0)
226 				cols += (treg >> 7) & 0xfe;
227 			if ((treg & 0x80) == 0) {
228 				newport_bfwait(npregs);
229 				treg = npregs->set.dcbdata0.byshort.s1;
230 			}
231 		} while ((treg & 0x8000) == 0);
232 		if (cols) {
233 			if (cols > newport_xsize)
234 				newport_xsize = cols;
235 			newport_ysize += linetable[i + 1];
236 		}
237 	}
238 	printk("NG1: Screensize %dx%d\n", newport_xsize, newport_ysize);
239 }
240 
241 static void newport_get_revisions(void)
242 {
243 	unsigned int tmp;
244 	unsigned int board_rev;
245 	unsigned int rex3_rev;
246 	unsigned int vc2_rev;
247 	unsigned int cmap_rev;
248 	unsigned int xmap9_rev;
249 	unsigned int bt445_rev;
250 	unsigned int bitplanes;
251 
252 	rex3_rev = npregs->cset.status & NPORT_STAT_VERS;
253 
254 	npregs->set.dcbmode = (DCB_CMAP0 | NCMAP_PROTOCOL |
255 			       NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
256 	tmp = npregs->set.dcbdata0.bybytes.b3;
257 	cmap_rev = tmp & 7;
258 	board_rev = (tmp >> 4) & 7;
259 	bitplanes = ((board_rev > 1) && (tmp & 0x80)) ? 8 : 24;
260 
261 	npregs->set.dcbmode = (DCB_CMAP1 | NCMAP_PROTOCOL |
262 			       NCMAP_REGADDR_RREG | NPORT_DMODE_W1);
263 	tmp = npregs->set.dcbdata0.bybytes.b3;
264 	if ((tmp & 7) < cmap_rev)
265 		cmap_rev = (tmp & 7);
266 
267 	vc2_rev = (newport_vc2_get(npregs, VC2_IREG_CONFIG) >> 5) & 7;
268 
269 	npregs->set.dcbmode = (DCB_XMAP0 | R_DCB_XMAP9_PROTOCOL |
270 			       XM9_CRS_REVISION | NPORT_DMODE_W1);
271 	xmap9_rev = npregs->set.dcbdata0.bybytes.b3 & 7;
272 
273 	npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
274 			       BT445_CSR_ADDR_REG | NPORT_DMODE_W1);
275 	npregs->set.dcbdata0.bybytes.b3 = BT445_REVISION_REG;
276 	npregs->set.dcbmode = (DCB_BT445 | BT445_PROTOCOL |
277 			       BT445_CSR_REVISION | NPORT_DMODE_W1);
278 	bt445_rev = (npregs->set.dcbdata0.bybytes.b3 >> 4) - 0x0a;
279 
280 #define L(a)     (char)('A'+(a))
281 	printk
282 	    ("NG1: Revision %d, %d bitplanes, REX3 revision %c, VC2 revision %c, xmap9 revision %c, cmap revision %c, bt445 revision %c\n",
283 	     board_rev, bitplanes, L(rex3_rev), L(vc2_rev), L(xmap9_rev),
284 	     L(cmap_rev ? (cmap_rev + 1) : 0), L(bt445_rev));
285 #undef L
286 
287 	if (board_rev == 3)	/* I don't know all affected revisions */
288 		xcurs_correction = 21;
289 }
290 
291 static void newport_exit(void)
292 {
293 	int i;
294 
295 	/* free memory used by user font */
296 	for (i = 0; i < MAX_NR_CONSOLES; i++)
297 		newport_set_def_font(i, NULL);
298 }
299 
300 /* Can't be __init, do_take_over_console may call it later */
301 static const char *newport_startup(void)
302 {
303 	int i;
304 
305 	npregs->cset.config = NPORT_CFG_GD0;
306 
307 	if (newport_wait(npregs))
308 		goto out_unmap;
309 
310 	npregs->set.xstarti = TESTVAL;
311 	if (npregs->set._xstart.word != XSTI_TO_FXSTART(TESTVAL))
312 		goto out_unmap;
313 
314 	for (i = 0; i < MAX_NR_CONSOLES; i++)
315 		font_data[i] = FONT_DATA;
316 
317 	newport_reset();
318 	newport_get_revisions();
319 	newport_get_screensize();
320 	newport_has_init = 1;
321 
322 	return "SGI Newport";
323 
324 out_unmap:
325 	return NULL;
326 }
327 
328 static void newport_init(struct vc_data *vc, int init)
329 {
330 	int cols, rows;
331 
332 	cols = newport_xsize / 8;
333 	rows = newport_ysize / 16;
334 	vc->vc_can_do_color = 1;
335 	if (init) {
336 		vc->vc_cols = cols;
337 		vc->vc_rows = rows;
338 	} else
339 		vc_resize(vc, cols, rows);
340 }
341 
342 static void newport_deinit(struct vc_data *c)
343 {
344 	if (!con_is_bound(&newport_con) && newport_has_init) {
345 		newport_exit();
346 		newport_has_init = 0;
347 	}
348 }
349 
350 static void newport_clear(struct vc_data *vc, int sy, int sx, int height,
351 			  int width)
352 {
353 	int xend = ((sx + width) << 3) - 1;
354 	int ystart = ((sy << 4) + topscan) & 0x3ff;
355 	int yend = (((sy + height) << 4) + topscan - 1) & 0x3ff;
356 
357 	if (logo_active)
358 		return;
359 
360 	if (ystart < yend) {
361 		newport_clear_screen(sx << 3, ystart, xend, yend,
362 				     (vc->vc_color & 0xf0) >> 4);
363 	} else {
364 		newport_clear_screen(sx << 3, ystart, xend, 1023,
365 				     (vc->vc_color & 0xf0) >> 4);
366 		newport_clear_screen(sx << 3, 0, xend, yend,
367 				     (vc->vc_color & 0xf0) >> 4);
368 	}
369 }
370 
371 static void newport_putc(struct vc_data *vc, int charattr, int ypos,
372 			 int xpos)
373 {
374 	unsigned char *p;
375 
376 	p = &font_data[vc->vc_num][(charattr & 0xff) << 4];
377 	charattr = (charattr >> 8) & 0xff;
378 	xpos <<= 3;
379 	ypos <<= 4;
380 
381 	newport_render_background(xpos, ypos, xpos, ypos,
382 				  (charattr & 0xf0) >> 4);
383 
384 	/* Set the color and drawing mode. */
385 	newport_wait(npregs);
386 	npregs->set.colori = charattr & 0xf;
387 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
388 				 NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
389 				 NPORT_DMODE0_L32);
390 
391 	/* Set coordinates for bitmap operation. */
392 	npregs->set.xystarti = (xpos << 16) | ((ypos + topscan) & 0x3ff);
393 	npregs->set.xyendi = ((xpos + 7) << 16);
394 	newport_wait(npregs);
395 
396 	/* Go, baby, go... */
397 	RENDER(npregs, p);
398 }
399 
400 static void newport_putcs(struct vc_data *vc, const unsigned short *s,
401 			  int count, int ypos, int xpos)
402 {
403 	int i;
404 	int charattr;
405 	unsigned char *p;
406 
407 	charattr = (scr_readw(s) >> 8) & 0xff;
408 
409 	xpos <<= 3;
410 	ypos <<= 4;
411 
412 	if (!logo_active)
413 		/* Clear the area behing the string */
414 		newport_render_background(xpos, ypos,
415 					  xpos + ((count - 1) << 3), ypos,
416 					  (charattr & 0xf0) >> 4);
417 
418 	newport_wait(npregs);
419 
420 	/* Set the color and drawing mode. */
421 	npregs->set.colori = charattr & 0xf;
422 	npregs->set.drawmode0 = (NPORT_DMODE0_DRAW | NPORT_DMODE0_BLOCK |
423 				 NPORT_DMODE0_STOPX | NPORT_DMODE0_ZPENAB |
424 				 NPORT_DMODE0_L32);
425 
426 	for (i = 0; i < count; i++, xpos += 8) {
427 		p = &font_data[vc->vc_num][(scr_readw(s++) & 0xff) << 4];
428 
429 		newport_wait(npregs);
430 
431 		/* Set coordinates for bitmap operation. */
432 		npregs->set.xystarti =
433 		    (xpos << 16) | ((ypos + topscan) & 0x3ff);
434 		npregs->set.xyendi = ((xpos + 7) << 16);
435 
436 		/* Go, baby, go... */
437 		RENDER(npregs, p);
438 	}
439 }
440 
441 static void newport_cursor(struct vc_data *vc, int mode)
442 {
443 	unsigned short treg;
444 	int xcurs, ycurs;
445 
446 	switch (mode) {
447 	case CM_ERASE:
448 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
449 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
450 				(treg & ~(VC2_CTRL_ECDISP)));
451 		break;
452 
453 	case CM_MOVE:
454 	case CM_DRAW:
455 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
456 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
457 				(treg | VC2_CTRL_ECDISP));
458 		xcurs = (vc->vc_pos - vc->vc_visible_origin) / 2;
459 		ycurs = ((xcurs / vc->vc_cols) << 4) + 31;
460 		xcurs = ((xcurs % vc->vc_cols) << 3) + xcurs_correction;
461 		newport_vc2_set(npregs, VC2_IREG_CURSX, xcurs);
462 		newport_vc2_set(npregs, VC2_IREG_CURSY, ycurs);
463 	}
464 }
465 
466 static int newport_switch(struct vc_data *vc)
467 {
468 	static int logo_drawn = 0;
469 
470 	topscan = 0;
471 	npregs->cset.topscan = 0x3ff;
472 
473 	if (!logo_drawn) {
474 		if (newport_show_logo()) {
475 			logo_drawn = 1;
476 			logo_active = 1;
477 		}
478 	}
479 
480 	return 1;
481 }
482 
483 static int newport_blank(struct vc_data *c, int blank, int mode_switch)
484 {
485 	unsigned short treg;
486 
487 	if (blank == 0) {
488 		/* unblank console */
489 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
490 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
491 				(treg | VC2_CTRL_EDISP));
492 	} else {
493 		/* blank console */
494 		treg = newport_vc2_get(npregs, VC2_IREG_CONTROL);
495 		newport_vc2_set(npregs, VC2_IREG_CONTROL,
496 				(treg & ~(VC2_CTRL_EDISP)));
497 	}
498 	return 1;
499 }
500 
501 static int newport_set_font(int unit, struct console_font *op)
502 {
503 	int w = op->width;
504 	int h = op->height;
505 	int size = h * op->charcount;
506 	int i;
507 	unsigned char *new_data, *data = op->data, *p;
508 
509 	/* ladis: when I grow up, there will be a day... and more sizes will
510 	 * be supported ;-) */
511 	if ((w != 8) || (h != 16)
512 	    || (op->charcount != 256 && op->charcount != 512))
513 		return -EINVAL;
514 
515 	if (!(new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size,
516 	     GFP_USER))) return -ENOMEM;
517 
518 	new_data += FONT_EXTRA_WORDS * sizeof(int);
519 	FNTSIZE(new_data) = size;
520 	FNTCHARCNT(new_data) = op->charcount;
521 	REFCOUNT(new_data) = 0;	/* usage counter */
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, unsigned flags)
573 {
574 	return newport_set_font(vc->vc_num, font);
575 }
576 
577 static bool newport_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
578 		enum con_scroll dir, unsigned int lines)
579 {
580 	int count, x, y;
581 	unsigned short *s, *d;
582 	unsigned short chattr;
583 
584 	logo_active = 0;	/* it's time to disable the logo now.. */
585 
586 	if (t == 0 && b == vc->vc_rows) {
587 		if (dir == SM_UP) {
588 			topscan = (topscan + (lines << 4)) & 0x3ff;
589 			newport_clear_lines(vc->vc_rows - lines,
590 					    vc->vc_rows - 1,
591 					    (vc->vc_color & 0xf0) >> 4);
592 		} else {
593 			topscan = (topscan + (-lines << 4)) & 0x3ff;
594 			newport_clear_lines(0, lines - 1,
595 					    (vc->vc_color & 0xf0) >> 4);
596 		}
597 		npregs->cset.topscan = (topscan - 1) & 0x3ff;
598 		return false;
599 	}
600 
601 	count = (b - t - lines) * vc->vc_cols;
602 	if (dir == SM_UP) {
603 		x = 0;
604 		y = t;
605 		s = (unsigned short *) (vc->vc_origin +
606 					vc->vc_size_row * (t + lines));
607 		d = (unsigned short *) (vc->vc_origin +
608 					vc->vc_size_row * t);
609 		while (count--) {
610 			chattr = scr_readw(s++);
611 			if (chattr != scr_readw(d)) {
612 				newport_putc(vc, chattr, y, x);
613 				scr_writew(chattr, d);
614 			}
615 			d++;
616 			if (++x == vc->vc_cols) {
617 				x = 0;
618 				y++;
619 			}
620 		}
621 		d = (unsigned short *) (vc->vc_origin +
622 					vc->vc_size_row * (b - lines));
623 		x = 0;
624 		y = b - lines;
625 		for (count = 0; count < (lines * vc->vc_cols); count++) {
626 			if (scr_readw(d) != vc->vc_video_erase_char) {
627 				newport_putc(vc, vc->vc_video_erase_char,
628 					     y, x);
629 				scr_writew(vc->vc_video_erase_char, d);
630 			}
631 			d++;
632 			if (++x == vc->vc_cols) {
633 				x = 0;
634 				y++;
635 			}
636 		}
637 	} else {
638 		x = vc->vc_cols - 1;
639 		y = b - 1;
640 		s = (unsigned short *) (vc->vc_origin +
641 					vc->vc_size_row * (b - lines) - 2);
642 		d = (unsigned short *) (vc->vc_origin +
643 					vc->vc_size_row * b - 2);
644 		while (count--) {
645 			chattr = scr_readw(s--);
646 			if (chattr != scr_readw(d)) {
647 				newport_putc(vc, chattr, y, x);
648 				scr_writew(chattr, d);
649 			}
650 			d--;
651 			if (x-- == 0) {
652 				x = vc->vc_cols - 1;
653 				y--;
654 			}
655 		}
656 		d = (unsigned short *) (vc->vc_origin +
657 					vc->vc_size_row * t);
658 		x = 0;
659 		y = t;
660 		for (count = 0; count < (lines * vc->vc_cols); count++) {
661 			if (scr_readw(d) != vc->vc_video_erase_char) {
662 				newport_putc(vc, vc->vc_video_erase_char,
663 					     y, x);
664 				scr_writew(vc->vc_video_erase_char, d);
665 			}
666 			d++;
667 			if (++x == vc->vc_cols) {
668 				x = 0;
669 				y++;
670 			}
671 		}
672 	}
673 	return true;
674 }
675 
676 static int newport_dummy(struct vc_data *c)
677 {
678 	return 0;
679 }
680 
681 #define DUMMY (void *) newport_dummy
682 
683 const struct consw newport_con = {
684 	.owner		  = THIS_MODULE,
685 	.con_startup	  = newport_startup,
686 	.con_init	  = newport_init,
687 	.con_deinit	  = newport_deinit,
688 	.con_clear	  = newport_clear,
689 	.con_putc	  = newport_putc,
690 	.con_putcs	  = newport_putcs,
691 	.con_cursor	  = newport_cursor,
692 	.con_scroll	  = newport_scroll,
693 	.con_switch	  = newport_switch,
694 	.con_blank	  = newport_blank,
695 	.con_font_set	  = newport_font_set,
696 	.con_font_default = newport_font_default,
697 	.con_set_origin	  = DUMMY,
698 	.con_save_screen  = DUMMY
699 };
700 
701 static int newport_probe(struct gio_device *dev,
702 			 const struct gio_device_id *id)
703 {
704 	unsigned long newport_addr;
705 	int err;
706 
707 	if (!dev->resource.start)
708 		return -EINVAL;
709 
710 	if (npregs)
711 		return -EBUSY; /* we only support one Newport as console */
712 
713 	newport_addr = dev->resource.start + 0xF0000;
714 	if (!request_mem_region(newport_addr, 0x10000, "Newport"))
715 		return -ENODEV;
716 
717 	npregs = (struct newport_regs *)/* ioremap cannot fail */
718 		ioremap(newport_addr, sizeof(struct newport_regs));
719 	console_lock();
720 	err = do_take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
721 	console_unlock();
722 	return err;
723 }
724 
725 static void newport_remove(struct gio_device *dev)
726 {
727 	give_up_console(&newport_con);
728 	iounmap((void *)npregs);
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 
745 int __init newport_console_init(void)
746 {
747 	return gio_register_driver(&newport_driver);
748 }
749 
750 void __exit newport_console_exit(void)
751 {
752 	gio_unregister_driver(&newport_driver);
753 }
754 
755 module_init(newport_console_init);
756 module_exit(newport_console_exit);
757 
758 MODULE_LICENSE("GPL");
759