aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/fm2fb.c
blob: a0763283d77651219cacab89273061004c2cd1fb (plain) (blame)
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
/*
 *  linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer
 *				   device
 *
 *	Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de)
 *	Copyright (C) 1999 Geert Uytterhoeven
 *
 *  Written for 2.0.x by Steffen A. Mork
 *  Ported to 2.1.x by Geert Uytterhoeven
 *  Ported to new api by James Simmons
 *
 *  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.
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/zorro.h>
#include <asm/io.h>

/*
 *	Some technical notes:
 *
 *	The BSC FrameMaster II (or Rainbow II) is a simple very dumb
 *	frame buffer which allows to display 24 bit true color images.
 *	Each pixel is 32 bit width so it's very easy to maintain the
 *	frame buffer. One long word has the following layout:
 *	AARRGGBB which means: AA the alpha channel byte, RR the red
 *	channel, GG the green channel and BB the blue channel.
 *
 *	The FrameMaster II supports the following video modes.
 *	- PAL/NTSC
 *	- interlaced/non interlaced
 *	- composite sync/sync/sync over green
 *
 *	The resolution is to the following both ones:
 *	- 768x576 (PAL)
 *	- 768x480 (NTSC)
 *
 *	This means that pixel access per line is fixed due to the
 *	fixed line width. In case of maximal resolution the frame
 *	buffer needs an amount of memory of 1.769.472 bytes which
 *	is near to 2 MByte (the allocated address space of Zorro2).
 *	The memory is channel interleaved. That means every channel
 *	owns four VRAMs. Unfortunatly most FrameMasters II are
 *	not assembled with memory for the alpha channel. In this
 *	case it could be possible to add the frame buffer into the
 *	normal memory pool.
 *
 *	At relative address 0x1ffff8 of the frame buffers base address
 *	there exists a control register with the number of
 *	four control bits. They have the following meaning:
 *	bit value meaning
 *
 *	 0    1   0=interlaced/1=non interlaced
 *	 1    2   0=video out disabled/1=video out enabled
 *	 2    4   0=normal mode as jumpered via JP8/1=complement mode
 *	 3    8   0=read  onboard ROM/1 normal operation (required)
 *
 *	As mentioned above there are several jumper. I think there
 *	is not very much information about the FrameMaster II in
 *	the world so I add these information for completeness.
 *
 *	JP1  interlace selection (1-2 non interlaced/2-3 interlaced)
 *	JP2  wait state creation (leave as is!)
 *	JP3  wait state creation (leave as is!)
 *	JP4  modulate composite sync on green output (1-2 composite
 *	     sync on green channel/2-3 normal composite sync)
 *	JP5  create test signal, shorting this jumper will create
 *	     a white screen
 *	JP6  sync creation (1-2 composite sync/2-3 H-sync output)
 *	JP8  video mode (1-2 PAL/2-3 NTSC)
 *
 *	With the following jumpering table you can connect the
 *	FrameMaster II to a normal TV via SCART connector:
 *	JP1:  2-3
 *	JP4:  2-3
 *	JP6:  2-3
 *	JP8:  1-2 (means PAL for Europe)
 *
 *	NOTE:
 *	There is no other possibility to change the video timings
 *	except the interlaced/non interlaced, sync control and the
 *	video mode PAL (50 Hz)/NTSC (60 Hz). Inside this
 *	FrameMaster II driver are assumed values to avoid anomalies
 *	to a future X server. Except the pixel clock is really
 *	constant at 30 MHz.
 *
 *	9 pin female video connector:
 *
 *	1  analog red 0.7 Vss
 *	2  analog green 0.7 Vss
 *	3  analog blue 0.7 Vss
 *	4  H-sync TTL
 *	5  V-sync TTL
 *	6  ground
 *	7  ground
 *	8  ground
 *	9  ground
 *
 *	Some performance notes:
 *	The FrameMaster II was not designed to display a console
 *	this driver would do! It was designed to display still true
 *	color images. Imagine: When scroll up a text line there
 *	must copied ca. 1.7 MBytes to another place inside this
 *	frame buffer. This means 1.7 MByte read and 1.7 MByte write
 *	over the slow 16 bit wide Zorro2 bus! A scroll of one
 *	line needs 1 second so do not expect to much from this
 *	driver - he is at the limit!
 *
 */

/*
 *	definitions
 */

#define FRAMEMASTER_SIZE	0x200000
#define FRAMEMASTER_REG		0x1ffff8

#define FRAMEMASTER_NOLACE	1
#define FRAMEMASTER_ENABLE	2
#define FRAMEMASTER_COMPL	4
#define FRAMEMASTER_ROM		8

static volatile unsigned char *fm2fb_reg;

static struct fb_fix_screeninfo fb_fix __devinitdata = {
	.smem_len =	FRAMEMASTER_REG,
	.type =		FB_TYPE_PACKED_PIXELS,
	.visual =	FB_VISUAL_TRUECOLOR,
	.line_length =	(768 << 2),
	.mmio_len =	(8),
	.accel =	FB_ACCEL_NONE,
};

static int fm2fb_mode __devinitdata = -1;

#define FM2FB_MODE_PAL	0
#define FM2FB_MODE_NTSC	1

static struct fb_var_screeninfo fb_var_modes[] __devinitdata = {
    {
	/* 768 x 576, 32 bpp (PAL) */
	768, 576, 768, 576, 0, 0, 32, 0,
	{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
	0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
	33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
    }, {
	/* 768 x 480, 32 bpp (NTSC - not supported yet */
	768, 480, 768, 480, 0, 0, 32, 0,
	{ 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 },
	0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE,
	33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0
    }
};

    /*
     *  Interface used by the world
     */

static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                           u_int transp, struct fb_info *info);
static int fm2fb_blank(int blank, struct fb_info *info);

static struct fb_ops fm2fb_ops = {
	.owner		= THIS_MODULE,
	.fb_setcolreg	= fm2fb_setcolreg,
	.fb_blank	= fm2fb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_cursor	= soft_cursor,
};

    /*
     *  Blank the display.
     */
static int fm2fb_blank(int blank, struct fb_info *info)
{
	unsigned char t = FRAMEMASTER_ROM;

	if (!blank)
		t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE;
	fm2fb_reg[0] = t;
	return 0;
}

    /*
     *  Set a single color register. The values supplied are already
     *  rounded down to the hardware's capabilities (according to the
     *  entries in the var structure). Return != 0 for invalid regno.
     */
static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                         u_int transp, struct fb_info *info)
{
	if (regno > info->cmap.len)
		return 1;
	red >>= 8;
	green >>= 8;
	blue >>= 8;

	((u32*)(info->pseudo_palette))[regno] = (red << 16) | (green << 8) | blue;
	return 0;
}

    /*
     *  Initialisation
     */

static int __devinit fm2fb_probe(struct zorro_dev *z,
				 const struct zorro_device_id *id);

static struct zorro_device_id fm2fb_devices[] __devinitdata = {
	{ ZORRO_PROD_BSC_FRAMEMASTER_II },
	{ ZORRO_PROD_HELFRICH_RAINBOW_II },
	{ 0 }
};

static struct zorro_driver fm2fb_driver = {
	.name		= "fm2fb",
	.id_table	= fm2fb_devices,
	.probe		= fm2fb_probe,
};

static int __devinit fm2fb_probe(struct zorro_dev *z,
				 const struct zorro_device_id *id)
{
	struct fb_info *info;
	unsigned long *ptr;
	int is_fm;
	int x, y;

	is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II;

	if (!zorro_request_device(z,"fm2fb"))
		return -ENXIO;

	info = framebuffer_alloc(256 * sizeof(u32), &z->dev);
	if (!info) {
		zorro_release_device(z);
		return -ENOMEM;
	}

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
		framebuffer_release(info);
		zorro_release_device(z);
		return -ENOMEM;
	}

	/* assigning memory to kernel space */
	fb_fix.smem_start = zorro_resource_start(z);
	info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE);
	fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG;
	fm2fb_reg  = (unsigned char *)(info->screen_base+FRAMEMASTER_REG);

	strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II");

	/* make EBU color bars on display */
	ptr = (unsigned long *)fb_fix.smem_start;
	for (y = 0; y < 576; y++) {
		for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */
		for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */
		for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */
		for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */
		for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */
		for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */
		for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */
		for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */
	}
	fm2fb_blank(0, info);

	if (fm2fb_mode == -1)
		fm2fb_mode = FM2FB_MODE_PAL;

	info->fbops = &fm2fb_ops;
	info->var = fb_var_modes[fm2fb_mode];
	info->pseudo_palette = info->par;
	info->par = NULL;
	info->fix = fb_fix;
	info->flags = FBINFO_DEFAULT;

	if (register_framebuffer(info) < 0) {
		fb_dealloc_cmap(&info->cmap);
		framebuffer_release(info);
		zorro_release_device(z);
		return -EINVAL;
	}
	printk("fb%d: %s frame buffer device\n", info->node, fb_fix.id);
	return 0;
}

int __init fm2fb_setup(char *options)
{
	char *this_opt;

	if (!options || !*options)
		return 0;

	while ((this_opt = strsep(&options, ",")) != NULL) {
		if (!strncmp(this_opt, "pal", 3))
			fm2fb_mode = FM2FB_MODE_PAL;
		else if (!strncmp(this_opt, "ntsc", 4))
			fm2fb_mode = FM2FB_MODE_NTSC;
	}
	return 0;
}

int __init fm2fb_init(void)
{
	char *option = NULL;

	if (fb_get_options("fm2fb", &option))
		return -ENODEV;
	fm2fb_setup(option);
	return zorro_register_driver(&fm2fb_driver);
}

module_init(fm2fb_init);
MODULE_LICENSE("GPL");