xref: /openbmc/linux/drivers/video/console/sticon.c (revision afb46f79) 
1 /*
2  *  linux/drivers/video/console/sticon.c - console driver using HP's STI firmware
3  *
4  *	Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
5  *	Copyright (C) 2002 Helge Deller <deller@gmx.de>
6  *
7  *  Based on linux/drivers/video/vgacon.c and linux/drivers/video/fbcon.c,
8  *  which were
9  *
10  *	Created 28 Sep 1997 by Geert Uytterhoeven
11  *	Rewritten by Martin Mares <mj@ucw.cz>, July 1998
12  *	Copyright (C) 1991, 1992  Linus Torvalds
13  *			    1995  Jay Estabrook
14  *	Copyright (C) 1995 Geert Uytterhoeven
15  *	Copyright (C) 1993 Bjoern Brauel
16  *			   Roman Hodek
17  *	Copyright (C) 1993 Hamish Macdonald
18  *			   Greg Harp
19  *	Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
20  *
21  *	      with work by William Rucklidge (wjr@cs.cornell.edu)
22  *			   Geert Uytterhoeven
23  *			   Jes Sorensen (jds@kom.auc.dk)
24  *			   Martin Apel
25  *	      with work by Guenther Kelleter
26  *			   Martin Schaller
27  *			   Andreas Schwab
28  *			   Emmanuel Marty (core@ggi-project.org)
29  *			   Jakub Jelinek (jj@ultra.linux.cz)
30  *			   Martin Mares <mj@ucw.cz>
31  *
32  *  This file is subject to the terms and conditions of the GNU General Public
33  *  License.  See the file COPYING in the main directory of this archive for
34  *  more details.
35  *
36  */
37 
38 #include <linux/init.h>
39 #include <linux/kernel.h>
40 #include <linux/console.h>
41 #include <linux/errno.h>
42 #include <linux/vt_kern.h>
43 #include <linux/kd.h>
44 #include <linux/selection.h>
45 #include <linux/module.h>
46 
47 #include <asm/io.h>
48 
49 #include "../fbdev/sticore.h"
50 
51 /* switching to graphics mode */
52 #define BLANK 0
53 static int vga_is_gfx;
54 
55 /* this is the sti_struct used for this console */
56 static struct sti_struct *sticon_sti;
57 
58 /* Software scrollback */
59 static unsigned long softback_buf, softback_curr;
60 static unsigned long softback_in;
61 static unsigned long /* softback_top, */ softback_end;
62 static int softback_lines;
63 
64 /* software cursor */
65 static int cursor_drawn;
66 #define CURSOR_DRAW_DELAY		(1)
67 #define DEFAULT_CURSOR_BLINK_RATE	(20)
68 
69 static int vbl_cursor_cnt;
70 
71 static inline void cursor_undrawn(void)
72 {
73     vbl_cursor_cnt = 0;
74     cursor_drawn = 0;
75 }
76 
77 static const char *sticon_startup(void)
78 {
79     return "STI console";
80 }
81 
82 static int sticon_set_palette(struct vc_data *c, unsigned char *table)
83 {
84     return -EINVAL;
85 }
86 
87 static void sticon_putc(struct vc_data *conp, int c, int ypos, int xpos)
88 {
89     int redraw_cursor = 0;
90 
91     if (vga_is_gfx || console_blanked)
92 	    return;
93 
94     if (conp->vc_mode != KD_TEXT)
95     	    return;
96 #if 0
97     if ((p->cursor_x == xpos) && (p->cursor_y == ypos)) {
98 	    cursor_undrawn();
99 	    redraw_cursor = 1;
100     }
101 #endif
102 
103     sti_putc(sticon_sti, c, ypos, xpos);
104 
105     if (redraw_cursor)
106 	    vbl_cursor_cnt = CURSOR_DRAW_DELAY;
107 }
108 
109 static void sticon_putcs(struct vc_data *conp, const unsigned short *s,
110 			 int count, int ypos, int xpos)
111 {
112     int redraw_cursor = 0;
113 
114     if (vga_is_gfx || console_blanked)
115 	    return;
116 
117     if (conp->vc_mode != KD_TEXT)
118     	    return;
119 
120 #if 0
121     if ((p->cursor_y == ypos) && (xpos <= p->cursor_x) &&
122 	(p->cursor_x < (xpos + count))) {
123 	    cursor_undrawn();
124 	    redraw_cursor = 1;
125     }
126 #endif
127 
128     while (count--) {
129 	sti_putc(sticon_sti, scr_readw(s++), ypos, xpos++);
130     }
131 
132     if (redraw_cursor)
133 	    vbl_cursor_cnt = CURSOR_DRAW_DELAY;
134 }
135 
136 static void sticon_cursor(struct vc_data *conp, int mode)
137 {
138     unsigned short car1;
139 
140     car1 = conp->vc_screenbuf[conp->vc_x + conp->vc_y * conp->vc_cols];
141     switch (mode) {
142     case CM_ERASE:
143 	sti_putc(sticon_sti, car1, conp->vc_y, conp->vc_x);
144 	break;
145     case CM_MOVE:
146     case CM_DRAW:
147 	switch (conp->vc_cursor_type & 0x0f) {
148 	case CUR_UNDERLINE:
149 	case CUR_LOWER_THIRD:
150 	case CUR_LOWER_HALF:
151 	case CUR_TWO_THIRDS:
152 	case CUR_BLOCK:
153 	    sti_putc(sticon_sti, (car1 & 255) + (0 << 8) + (7 << 11),
154 		     conp->vc_y, conp->vc_x);
155 	    break;
156 	}
157 	break;
158     }
159 }
160 
161 static int sticon_scroll(struct vc_data *conp, int t, int b, int dir, int count)
162 {
163     struct sti_struct *sti = sticon_sti;
164 
165     if (vga_is_gfx)
166         return 0;
167 
168     sticon_cursor(conp, CM_ERASE);
169 
170     switch (dir) {
171     case SM_UP:
172 	sti_bmove(sti, t + count, 0, t, 0, b - t - count, conp->vc_cols);
173 	sti_clear(sti, b - count, 0, count, conp->vc_cols, conp->vc_video_erase_char);
174 	break;
175 
176     case SM_DOWN:
177 	sti_bmove(sti, t, 0, t + count, 0, b - t - count, conp->vc_cols);
178 	sti_clear(sti, t, 0, count, conp->vc_cols, conp->vc_video_erase_char);
179 	break;
180     }
181 
182     return 0;
183 }
184 
185 static void sticon_bmove(struct vc_data *conp, int sy, int sx,
186 	int dy, int dx, int height, int width)
187 {
188     if (!width || !height)
189 	    return;
190 #if 0
191     if (((sy <= p->cursor_y) && (p->cursor_y < sy+height) &&
192 	(sx <= p->cursor_x) && (p->cursor_x < sx+width)) ||
193 	((dy <= p->cursor_y) && (p->cursor_y < dy+height) &&
194 	(dx <= p->cursor_x) && (p->cursor_x < dx+width)))
195 		sticon_cursor(p, CM_ERASE /*|CM_SOFTBACK*/);
196 #endif
197 
198     sti_bmove(sticon_sti, sy, sx, dy, dx, height, width);
199 }
200 
201 static void sticon_init(struct vc_data *c, int init)
202 {
203     struct sti_struct *sti = sticon_sti;
204     int vc_cols, vc_rows;
205 
206     sti_set(sti, 0, 0, sti_onscreen_y(sti), sti_onscreen_x(sti), 0);
207     vc_cols = sti_onscreen_x(sti) / sti->font_width;
208     vc_rows = sti_onscreen_y(sti) / sti->font_height;
209     c->vc_can_do_color = 1;
210 
211     if (init) {
212 	c->vc_cols = vc_cols;
213 	c->vc_rows = vc_rows;
214     } else {
215 	/* vc_rows = (c->vc_rows > vc_rows) ? vc_rows : c->vc_rows; */
216 	/* vc_cols = (c->vc_cols > vc_cols) ? vc_cols : c->vc_cols; */
217 	vc_resize(c, vc_cols, vc_rows);
218 /*	vc_resize_con(vc_rows, vc_cols, c->vc_num); */
219     }
220 }
221 
222 static void sticon_deinit(struct vc_data *c)
223 {
224 }
225 
226 static void sticon_clear(struct vc_data *conp, int sy, int sx, int height,
227 			 int width)
228 {
229     if (!height || !width)
230 	return;
231 
232     sti_clear(sticon_sti, sy, sx, height, width, conp->vc_video_erase_char);
233 }
234 
235 static int sticon_switch(struct vc_data *conp)
236 {
237     return 1;	/* needs refreshing */
238 }
239 
240 static int sticon_set_origin(struct vc_data *conp)
241 {
242     return 0;
243 }
244 
245 static int sticon_blank(struct vc_data *c, int blank, int mode_switch)
246 {
247     if (blank == 0) {
248 	if (mode_switch)
249 	    vga_is_gfx = 0;
250 	return 1;
251     }
252     sticon_set_origin(c);
253     sti_clear(sticon_sti, 0,0, c->vc_rows, c->vc_cols, BLANK);
254     if (mode_switch)
255 	vga_is_gfx = 1;
256     return 1;
257 }
258 
259 static int sticon_scrolldelta(struct vc_data *conp, int lines)
260 {
261     return 0;
262 }
263 
264 static u16 *sticon_screen_pos(struct vc_data *conp, int offset)
265 {
266     int line;
267     unsigned long p;
268 
269     if (conp->vc_num != fg_console || !softback_lines)
270     	return (u16 *)(conp->vc_origin + offset);
271     line = offset / conp->vc_size_row;
272     if (line >= softback_lines)
273     	return (u16 *)(conp->vc_origin + offset - softback_lines * conp->vc_size_row);
274     p = softback_curr + offset;
275     if (p >= softback_end)
276     	p += softback_buf - softback_end;
277     return (u16 *)p;
278 }
279 
280 static unsigned long sticon_getxy(struct vc_data *conp, unsigned long pos,
281 				  int *px, int *py)
282 {
283     int x, y;
284     unsigned long ret;
285     if (pos >= conp->vc_origin && pos < conp->vc_scr_end) {
286     	unsigned long offset = (pos - conp->vc_origin) / 2;
287 
288     	x = offset % conp->vc_cols;
289     	y = offset / conp->vc_cols;
290     	if (conp->vc_num == fg_console)
291     	    y += softback_lines;
292     	ret = pos + (conp->vc_cols - x) * 2;
293     } else if (conp->vc_num == fg_console && softback_lines) {
294     	unsigned long offset = pos - softback_curr;
295 
296     	if (pos < softback_curr)
297     	    offset += softback_end - softback_buf;
298     	offset /= 2;
299     	x = offset % conp->vc_cols;
300     	y = offset / conp->vc_cols;
301 	ret = pos + (conp->vc_cols - x) * 2;
302 	if (ret == softback_end)
303 	    ret = softback_buf;
304 	if (ret == softback_in)
305 	    ret = conp->vc_origin;
306     } else {
307     	/* Should not happen */
308     	x = y = 0;
309     	ret = conp->vc_origin;
310     }
311     if (px) *px = x;
312     if (py) *py = y;
313     return ret;
314 }
315 
316 static u8 sticon_build_attr(struct vc_data *conp, u8 color, u8 intens,
317 			    u8 blink, u8 underline, u8 reverse, u8 italic)
318 {
319     u8 attr = ((color & 0x70) >> 1) | ((color & 7));
320 
321     if (reverse) {
322 	color = ((color >> 3) & 0x7) | ((color & 0x7) << 3);
323     }
324 
325     return attr;
326 }
327 
328 static void sticon_invert_region(struct vc_data *conp, u16 *p, int count)
329 {
330     int col = 1; /* vga_can_do_color; */
331 
332     while (count--) {
333 	u16 a = scr_readw(p);
334 
335 	if (col)
336 		a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
337 	else
338 		a = ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700;
339 
340 	scr_writew(a, p++);
341     }
342 }
343 
344 static void sticon_save_screen(struct vc_data *conp)
345 {
346 }
347 
348 static const struct consw sti_con = {
349 	.owner			= THIS_MODULE,
350 	.con_startup		= sticon_startup,
351 	.con_init		= sticon_init,
352 	.con_deinit		= sticon_deinit,
353 	.con_clear		= sticon_clear,
354 	.con_putc		= sticon_putc,
355 	.con_putcs		= sticon_putcs,
356 	.con_cursor		= sticon_cursor,
357 	.con_scroll		= sticon_scroll,
358 	.con_bmove		= sticon_bmove,
359 	.con_switch		= sticon_switch,
360 	.con_blank		= sticon_blank,
361 	.con_set_palette	= sticon_set_palette,
362 	.con_scrolldelta	= sticon_scrolldelta,
363 	.con_set_origin		= sticon_set_origin,
364 	.con_save_screen	= sticon_save_screen,
365 	.con_build_attr		= sticon_build_attr,
366 	.con_invert_region	= sticon_invert_region,
367 	.con_screen_pos		= sticon_screen_pos,
368 	.con_getxy		= sticon_getxy,
369 };
370 
371 
372 
373 static int __init sticonsole_init(void)
374 {
375     int err;
376     /* already initialized ? */
377     if (sticon_sti)
378 	 return 0;
379 
380     sticon_sti = sti_get_rom(0);
381     if (!sticon_sti)
382 	return -ENODEV;
383 
384     if (conswitchp == &dummy_con) {
385 	printk(KERN_INFO "sticon: Initializing STI text console.\n");
386 	console_lock();
387 	err = do_take_over_console(&sti_con, 0, MAX_NR_CONSOLES - 1, 1);
388 	console_unlock();
389 	return err;
390     }
391     return 0;
392 }
393 
394 module_init(sticonsole_init);
395 MODULE_LICENSE("GPL");
396