aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/pmag-aa-fb.c
blob: d92f352211efcdce0340ba94907b60d51d995d3d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
/*
 *	linux/drivers/video/pmag-aa-fb.c
 *	Copyright 2002 Karsten Merker <merker@debian.org>
 *
 *	PMAG-AA TurboChannel framebuffer card support ... derived from
 *	pmag-ba-fb.c, which is Copyright (C) 1999, 2000, 2001 by
 *	Michael Engel <engel@unix-ag.org>, Karsten Merker <merker@debian.org>
 *	and Harald Koerfgen <hkoerfg@web.de>, which itself is derived from
 *	"HP300 Topcat framebuffer support (derived from macfb of all things)
 *	Phil Blundell <philb@gnu.org> 1998"
 *
 *	This file is subject to the terms and conditions of the GNU General
 *	Public License.  See the file COPYING in the main directory of this
 *	archive for more details.
 *
 *	2002-09-28  Karsten Merker <merker@linuxtag.org>
 *		Version 0.01: First try to get a PMAG-AA running.
 *
 *	2003-02-24  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
 *		Version 0.02: Major code cleanup.
 *
 *	2003-09-21  Thiemo Seufer  <seufer@csv.ica.uni-stuttgart.de>
 *		Hardware cursor support.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/console.h>

#include <asm/bootinfo.h>
#include <asm/dec/machtype.h>
#include <asm/dec/tc.h>

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>

#include "bt455.h"
#include "bt431.h"

/* Version information */
#define DRIVER_VERSION "0.02"
#define DRIVER_AUTHOR "Karsten Merker <merker@linuxtag.org>"
#define DRIVER_DESCRIPTION "PMAG-AA Framebuffer Driver"

/* Prototypes */
static int aafb_set_var(struct fb_var_screeninfo *var, int con,
			struct fb_info *info);

/*
 * Bt455 RAM DAC register base offset (rel. to TC slot base address).
 */
#define PMAG_AA_BT455_OFFSET		0x100000

/*
 * Bt431 cursor generator offset (rel. to TC slot base address).
 */
#define PMAG_AA_BT431_OFFSET		0x180000

/*
 * Begin of PMAG-AA framebuffer memory relative to TC slot address,
 * resolution is 1280x1024x1 (8 bits deep, but only LSB is used).
 */
#define PMAG_AA_ONBOARD_FBMEM_OFFSET	0x200000

struct aafb_cursor {
	struct timer_list timer;
	int enable;
	int on;
	int vbl_cnt;
	int blink_rate;
	u16 x, y, width, height;
};

#define CURSOR_TIMER_FREQ	(HZ / 50)
#define CURSOR_BLINK_RATE	(20)
#define CURSOR_DRAW_DELAY	(2)

struct aafb_info {
	struct fb_info info;
	struct display disp;
	struct aafb_cursor cursor;
	struct bt455_regs *bt455;
	struct bt431_regs *bt431;
	unsigned long fb_start;
	unsigned long fb_size;
	unsigned long fb_line_length;
};

/*
 * Max 3 TURBOchannel slots -> max 3 PMAG-AA.
 */
static struct aafb_info my_fb_info[3];

static struct aafb_par {
} current_par;

static int currcon = -1;

static void aafb_set_cursor(struct aafb_info *info, int on)
{
	struct aafb_cursor *c = &info->cursor;

	if (on) {
		bt431_position_cursor(info->bt431, c->x, c->y);
		bt431_enable_cursor(info->bt431);
	} else
		bt431_erase_cursor(info->bt431);
}

static void aafbcon_cursor(struct display *disp, int mode, int x, int y)
{
	struct aafb_info *info = (struct aafb_info *)disp->fb_info;
	struct aafb_cursor *c = &info->cursor;

	x *= fontwidth(disp);
	y *= fontheight(disp);

	if (c->x == x && c->y == y && (mode == CM_ERASE) == !c->enable)
		return;

	c->enable = 0;
	if (c->on)
		aafb_set_cursor(info, 0);
	c->x = x - disp->var.xoffset;
	c->y = y - disp->var.yoffset;

	switch (mode) {
		case CM_ERASE:
			c->on = 0;
			break;
		case CM_DRAW:
		case CM_MOVE:
			if (c->on)
				aafb_set_cursor(info, c->on);
			else
				c->vbl_cnt = CURSOR_DRAW_DELAY;
			c->enable = 1;
			break;
	}
}

static int aafbcon_set_font(struct display *disp, int width, int height)
{
	struct aafb_info *info = (struct aafb_info *)disp->fb_info;
	struct aafb_cursor *c = &info->cursor;
	u8 fgc = ~attr_bgcol_ec(disp, disp->conp);

	if (width > 64 || height > 64 || width < 0 || height < 0)
		return -EINVAL;

	c->height = height;
	c->width = width;

	bt431_set_font(info->bt431, fgc, width, height);

	return 1;
}

static void aafb_cursor_timer_handler(unsigned long data)
{
	struct aafb_info *info = (struct aafb_info *)data;
	struct aafb_cursor *c = &info->cursor;

	if (!c->enable)
		goto out;

	if (c->vbl_cnt && --c->vbl_cnt == 0) {
		c->on ^= 1;
		aafb_set_cursor(info, c->on);
		c->vbl_cnt = c->blink_rate;
	}

out:
	c->timer.expires = jiffies + CURSOR_TIMER_FREQ;
	add_timer(&c->timer);
}

static void __init aafb_cursor_init(struct aafb_info *info)
{
	struct aafb_cursor *c = &info->cursor;

	c->enable = 1;
	c->on = 1;
	c->x = c->y = 0;
	c->width = c->height = 0;
	c->vbl_cnt = CURSOR_DRAW_DELAY;
	c->blink_rate = CURSOR_BLINK_RATE;

	init_timer(&c->timer);
	c->timer.data = (unsigned long)info;
	c->timer.function = aafb_cursor_timer_handler;
	mod_timer(&c->timer, jiffies + CURSOR_TIMER_FREQ);
}

static void __exit aafb_cursor_exit(struct aafb_info *info)
{
	struct aafb_cursor *c = &info->cursor;

	del_timer_sync(&c->timer);
}

static struct display_switch aafb_switch8 = {
	.setup = fbcon_cfb8_setup,
	.bmove = fbcon_cfb8_bmove,
	.clear = fbcon_cfb8_clear,
	.putc = fbcon_cfb8_putc,
	.putcs = fbcon_cfb8_putcs,
	.revc = fbcon_cfb8_revc,
	.cursor = aafbcon_cursor,
	.set_font = aafbcon_set_font,
	.clear_margins = fbcon_cfb8_clear_margins,
	.fontwidthmask = FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
};

static void aafb_get_par(struct aafb_par *par)
{
	*par = current_par;
}

static int aafb_get_fix(struct fb_fix_screeninfo *fix, int con,
			struct fb_info *info)
{
	struct aafb_info *ip = (struct aafb_info *)info;

	memset(fix, 0, sizeof(struct fb_fix_screeninfo));
	strcpy(fix->id, "PMAG-AA");
	fix->smem_start = ip->fb_start;
	fix->smem_len = ip->fb_size;
	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->ypanstep = 1;
	fix->ywrapstep = 1;
	fix->visual = FB_VISUAL_MONO10;
	fix->line_length = 1280;
	fix->accel = FB_ACCEL_NONE;

	return 0;
}

static void aafb_set_disp(struct display *disp, int con,
			  struct aafb_info *info)
{
	struct fb_fix_screeninfo fix;

	disp->fb_info = &info->info;
	aafb_set_var(&disp->var, con, &info->info);
	if (disp->conp && disp->conp->vc_sw && disp->conp->vc_sw->con_cursor)
		disp->conp->vc_sw->con_cursor(disp->conp, CM_ERASE);
	disp->dispsw = &aafb_switch8;
	disp->dispsw_data = 0;

	aafb_get_fix(&fix, con, &info->info);
	disp->screen_base = (u8 *) fix.smem_start;
	disp->visual = fix.visual;
	disp->type = fix.type;
	disp->type_aux = fix.type_aux;
	disp->ypanstep = fix.ypanstep;
	disp->ywrapstep = fix.ywrapstep;
	disp->line_length = fix.line_length;
	disp->next_line = 2048;
	disp->can_soft_blank = 1;
	disp->inverse = 0;
	disp->scrollmode = SCROLL_YREDRAW;

	aafbcon_set_font(disp, fontwidth(disp), fontheight(disp));
}

static int aafb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			 struct fb_info *info)
{
	static u16 color[2] = {0x0000, 0x000f};
	static struct fb_cmap aafb_cmap = {0, 2, color, color, color, NULL};

	fb_copy_cmap(&aafb_cmap, cmap, kspc ? 0 : 2);
	return 0;
}

static int aafb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			 struct fb_info *info)
{
	u16 color[2] = {0x0000, 0x000f};

	if (cmap->start == 0
	    && cmap->len == 2
	    && memcmp(cmap->red, color, sizeof(color)) == 0
	    && memcmp(cmap->green, color, sizeof(color)) == 0
	    && memcmp(cmap->blue, color, sizeof(color)) == 0
	    && cmap->transp == NULL)
		return 0;
	else
		return -EINVAL;
}

static int aafb_ioctl(struct fb_info *info, u32 cmd, unsigned long arg)
{
	/* TODO: Not yet implemented */
	return -ENOIOCTLCMD;
}

static int aafb_switch(int con, struct fb_info *info)
{
	struct aafb_info *ip = (struct aafb_info *)info;
	struct display *old = (currcon < 0) ? &ip->disp : (fb_display + currcon);
	struct display *new = (con < 0) ? &ip->disp : (fb_display + con);

	if (old->conp && old->conp->vc_sw && old->conp->vc_sw->con_cursor)
		old->conp->vc_sw->con_cursor(old->conp, CM_ERASE);

	/* Set the current console. */
	currcon = con;
	aafb_set_disp(new, con, ip);

	return 0;
}

static void aafb_encode_var(struct fb_var_screeninfo *var,
			    struct aafb_par *par)
{
	var->xres = 1280;
	var->yres = 1024;
	var->xres_virtual = 2048;
	var->yres_virtual = 1024;
	var->xoffset = 0;
	var->yoffset = 0;
	var->bits_per_pixel = 8;
	var->grayscale = 1;
	var->red.offset = 0;
	var->red.length = 0;
	var->red.msb_right = 0;
	var->green.offset = 0;
	var->green.length = 1;
	var->green.msb_right = 0;
	var->blue.offset = 0;
	var->blue.length = 0;
	var->blue.msb_right = 0;
	var->transp.offset = 0;
	var->transp.length = 0;
	var->transp.msb_right = 0;
	var->nonstd = 0;
	var->activate &= ~FB_ACTIVATE_MASK & FB_ACTIVATE_NOW;
	var->accel_flags = 0;
	var->sync = FB_SYNC_ON_GREEN;
	var->vmode &= ~FB_VMODE_MASK & FB_VMODE_NONINTERLACED;
}

static int aafb_get_var(struct fb_var_screeninfo *var, int con,
			struct fb_info *info)
{
	if (con < 0) {
		struct aafb_par par;

		memset(var, 0, sizeof(struct fb_var_screeninfo));
		aafb_get_par(&par);
		aafb_encode_var(var, &par);
	} else
		*var = info->var;

	return 0;
}

static int aafb_set_var(struct fb_var_screeninfo *var, int con,
			struct fb_info *info)
{
	struct aafb_par par;

	aafb_get_par(&par);
	aafb_encode_var(var, &par);
	info->var = *var;

	return 0;
}

static int aafb_update_var(int con, struct fb_info *info)
{
	struct aafb_info *ip = (struct aafb_info *)info;
	struct display *disp = (con < 0) ? &ip->disp : (fb_display + con);

	if (con == currcon)
		aafbcon_cursor(disp, CM_ERASE, ip->cursor.x, ip->cursor.y);

	return 0;
}

/* 0 unblanks, any other blanks. */

static void aafb_blank(int blank, struct fb_info *info)
{
	struct aafb_info *ip = (struct aafb_info *)info;
	u8 val = blank ? 0x00 : 0x0f;

	bt455_write_cmap_entry(ip->bt455, 1, val, val, val);
	aafbcon_cursor(&ip->disp, CM_ERASE, ip->cursor.x, ip->cursor.y);
}

static struct fb_ops aafb_ops = {
	.owner = THIS_MODULE,
	.fb_get_fix = aafb_get_fix,
	.fb_get_var = aafb_get_var,
	.fb_set_var = aafb_set_var,
	.fb_get_cmap = aafb_get_cmap,
	.fb_set_cmap = aafb_set_cmap,
	.fb_ioctl = aafb_ioctl
};

static int __init init_one(int slot)
{
	unsigned long base_addr = CKSEG1ADDR(get_tc_base_addr(slot));
	struct aafb_info *ip = &my_fb_info[slot];

	memset(ip, 0, sizeof(struct aafb_info));

	/*
	 * Framebuffer display memory base address and friends.
	 */
	ip->bt455 = (struct bt455_regs *) (base_addr + PMAG_AA_BT455_OFFSET);
	ip->bt431 = (struct bt431_regs *) (base_addr + PMAG_AA_BT431_OFFSET);
	ip->fb_start = base_addr + PMAG_AA_ONBOARD_FBMEM_OFFSET;
	ip->fb_size = 2048 * 1024; /* fb_fix_screeninfo.smem_length
				      seems to be physical */
	ip->fb_line_length = 2048;

	/*
	 * Let there be consoles..
	 */
	strcpy(ip->info.modename, "PMAG-AA");
	ip->info.node = -1;
	ip->info.flags = FBINFO_FLAG_DEFAULT;
	ip->info.fbops = &aafb_ops;
	ip->info.disp = &ip->disp;
	ip->info.changevar = NULL;
	ip->info.switch_con = &aafb_switch;
	ip->info.updatevar = &aafb_update_var;
	ip->info.blank = &aafb_blank;

	aafb_set_disp(&ip->disp, currcon, ip);

	/*
	 * Configure the RAM DACs.
	 */
	bt455_erase_cursor(ip->bt455);

	/* Init colormap. */
	bt455_write_cmap_entry(ip->bt455, 0, 0x00, 0x00, 0x00);
	bt455_write_cmap_entry(ip->bt455, 1, 0x0f, 0x0f, 0x0f);

	/* Init hardware cursor. */
	bt431_init_cursor(ip->bt431);
	aafb_cursor_init(ip);

	/* Clear the screen. */
	memset ((void *)ip->fb_start, 0, ip->fb_size);

	if (register_framebuffer(&ip->info) < 0)
		return -EINVAL;

	printk(KERN_INFO "fb%d: %s frame buffer in TC slot %d\n",
	       GET_FB_IDX(ip->info.node), ip->info.modename, slot);

	return 0;
}

static int __exit exit_one(int slot)
{
	struct aafb_info *ip = &my_fb_info[slot];

	if (unregister_framebuffer(&ip->info) < 0)
		return -EINVAL;

	return 0;
}

/*
 * Initialise the framebuffer.
 */
int __init pmagaafb_init(void)
{
	int sid;
	int found = 0;

	while ((sid = search_tc_card("PMAG-AA")) >= 0) {
		found = 1;
		claim_tc_card(sid);
		init_one(sid);
	}

	return found ? 0 : -ENXIO;
}

static void __exit pmagaafb_exit(void)
{
	int sid;

	while ((sid = search_tc_card("PMAG-AA")) >= 0) {
		exit_one(sid);
		release_tc_card(sid);
	}
}

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
MODULE_LICENSE("GPL");
#ifdef MODULE
module_init(pmagaafb_init);
module_exit(pmagaafb_exit);
#endif