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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer | |
3 | * device | |
4 | * | |
5 | * Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de) | |
6 | * Copyright (C) 1999 Geert Uytterhoeven | |
7 | * | |
8 | * Written for 2.0.x by Steffen A. Mork | |
9 | * Ported to 2.1.x by Geert Uytterhoeven | |
10 | * Ported to new api by James Simmons | |
11 | * | |
12 | * This file is subject to the terms and conditions of the GNU General Public | |
13 | * License. See the file COPYING in the main directory of this archive for | |
14 | * more details. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/fb.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/zorro.h> | |
22 | #include <asm/io.h> | |
23 | ||
24 | /* | |
25 | * Some technical notes: | |
26 | * | |
27 | * The BSC FrameMaster II (or Rainbow II) is a simple very dumb | |
28 | * frame buffer which allows to display 24 bit true color images. | |
29 | * Each pixel is 32 bit width so it's very easy to maintain the | |
30 | * frame buffer. One long word has the following layout: | |
31 | * AARRGGBB which means: AA the alpha channel byte, RR the red | |
32 | * channel, GG the green channel and BB the blue channel. | |
33 | * | |
34 | * The FrameMaster II supports the following video modes. | |
35 | * - PAL/NTSC | |
36 | * - interlaced/non interlaced | |
37 | * - composite sync/sync/sync over green | |
38 | * | |
39 | * The resolution is to the following both ones: | |
40 | * - 768x576 (PAL) | |
41 | * - 768x480 (NTSC) | |
42 | * | |
43 | * This means that pixel access per line is fixed due to the | |
44 | * fixed line width. In case of maximal resolution the frame | |
45 | * buffer needs an amount of memory of 1.769.472 bytes which | |
46 | * is near to 2 MByte (the allocated address space of Zorro2). | |
47 | * The memory is channel interleaved. That means every channel | |
25985edc | 48 | * owns four VRAMs. Unfortunately most FrameMasters II are |
1da177e4 LT |
49 | * not assembled with memory for the alpha channel. In this |
50 | * case it could be possible to add the frame buffer into the | |
51 | * normal memory pool. | |
52 | * | |
53 | * At relative address 0x1ffff8 of the frame buffers base address | |
54 | * there exists a control register with the number of | |
55 | * four control bits. They have the following meaning: | |
56 | * bit value meaning | |
57 | * | |
58 | * 0 1 0=interlaced/1=non interlaced | |
59 | * 1 2 0=video out disabled/1=video out enabled | |
60 | * 2 4 0=normal mode as jumpered via JP8/1=complement mode | |
61 | * 3 8 0=read onboard ROM/1 normal operation (required) | |
62 | * | |
63 | * As mentioned above there are several jumper. I think there | |
64 | * is not very much information about the FrameMaster II in | |
65 | * the world so I add these information for completeness. | |
66 | * | |
67 | * JP1 interlace selection (1-2 non interlaced/2-3 interlaced) | |
68 | * JP2 wait state creation (leave as is!) | |
69 | * JP3 wait state creation (leave as is!) | |
70 | * JP4 modulate composite sync on green output (1-2 composite | |
71 | * sync on green channel/2-3 normal composite sync) | |
72 | * JP5 create test signal, shorting this jumper will create | |
73 | * a white screen | |
74 | * JP6 sync creation (1-2 composite sync/2-3 H-sync output) | |
75 | * JP8 video mode (1-2 PAL/2-3 NTSC) | |
76 | * | |
77 | * With the following jumpering table you can connect the | |
78 | * FrameMaster II to a normal TV via SCART connector: | |
79 | * JP1: 2-3 | |
80 | * JP4: 2-3 | |
81 | * JP6: 2-3 | |
82 | * JP8: 1-2 (means PAL for Europe) | |
83 | * | |
84 | * NOTE: | |
85 | * There is no other possibility to change the video timings | |
86 | * except the interlaced/non interlaced, sync control and the | |
87 | * video mode PAL (50 Hz)/NTSC (60 Hz). Inside this | |
88 | * FrameMaster II driver are assumed values to avoid anomalies | |
89 | * to a future X server. Except the pixel clock is really | |
90 | * constant at 30 MHz. | |
91 | * | |
92 | * 9 pin female video connector: | |
93 | * | |
94 | * 1 analog red 0.7 Vss | |
95 | * 2 analog green 0.7 Vss | |
96 | * 3 analog blue 0.7 Vss | |
97 | * 4 H-sync TTL | |
98 | * 5 V-sync TTL | |
99 | * 6 ground | |
100 | * 7 ground | |
101 | * 8 ground | |
102 | * 9 ground | |
103 | * | |
104 | * Some performance notes: | |
105 | * The FrameMaster II was not designed to display a console | |
106 | * this driver would do! It was designed to display still true | |
107 | * color images. Imagine: When scroll up a text line there | |
108 | * must copied ca. 1.7 MBytes to another place inside this | |
109 | * frame buffer. This means 1.7 MByte read and 1.7 MByte write | |
110 | * over the slow 16 bit wide Zorro2 bus! A scroll of one | |
111 | * line needs 1 second so do not expect to much from this | |
112 | * driver - he is at the limit! | |
113 | * | |
114 | */ | |
115 | ||
116 | /* | |
117 | * definitions | |
118 | */ | |
119 | ||
120 | #define FRAMEMASTER_SIZE 0x200000 | |
121 | #define FRAMEMASTER_REG 0x1ffff8 | |
122 | ||
123 | #define FRAMEMASTER_NOLACE 1 | |
124 | #define FRAMEMASTER_ENABLE 2 | |
125 | #define FRAMEMASTER_COMPL 4 | |
126 | #define FRAMEMASTER_ROM 8 | |
127 | ||
128 | static volatile unsigned char *fm2fb_reg; | |
129 | ||
48c68c4f | 130 | static struct fb_fix_screeninfo fb_fix = { |
1da177e4 LT |
131 | .smem_len = FRAMEMASTER_REG, |
132 | .type = FB_TYPE_PACKED_PIXELS, | |
133 | .visual = FB_VISUAL_TRUECOLOR, | |
134 | .line_length = (768 << 2), | |
135 | .mmio_len = (8), | |
136 | .accel = FB_ACCEL_NONE, | |
137 | }; | |
138 | ||
48c68c4f | 139 | static int fm2fb_mode = -1; |
1da177e4 LT |
140 | |
141 | #define FM2FB_MODE_PAL 0 | |
142 | #define FM2FB_MODE_NTSC 1 | |
143 | ||
48c68c4f | 144 | static struct fb_var_screeninfo fb_var_modes[] = { |
1da177e4 LT |
145 | { |
146 | /* 768 x 576, 32 bpp (PAL) */ | |
147 | 768, 576, 768, 576, 0, 0, 32, 0, | |
148 | { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 }, | |
149 | 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE, | |
150 | 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0 | |
151 | }, { | |
152 | /* 768 x 480, 32 bpp (NTSC - not supported yet */ | |
153 | 768, 480, 768, 480, 0, 0, 32, 0, | |
154 | { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 }, | |
155 | 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE, | |
156 | 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0 | |
157 | } | |
158 | }; | |
159 | ||
160 | /* | |
161 | * Interface used by the world | |
162 | */ | |
163 | ||
164 | static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
165 | u_int transp, struct fb_info *info); | |
166 | static int fm2fb_blank(int blank, struct fb_info *info); | |
167 | ||
168 | static struct fb_ops fm2fb_ops = { | |
169 | .owner = THIS_MODULE, | |
170 | .fb_setcolreg = fm2fb_setcolreg, | |
171 | .fb_blank = fm2fb_blank, | |
172 | .fb_fillrect = cfb_fillrect, | |
173 | .fb_copyarea = cfb_copyarea, | |
174 | .fb_imageblit = cfb_imageblit, | |
1da177e4 LT |
175 | }; |
176 | ||
177 | /* | |
178 | * Blank the display. | |
179 | */ | |
180 | static int fm2fb_blank(int blank, struct fb_info *info) | |
181 | { | |
182 | unsigned char t = FRAMEMASTER_ROM; | |
183 | ||
184 | if (!blank) | |
185 | t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE; | |
186 | fm2fb_reg[0] = t; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Set a single color register. The values supplied are already | |
192 | * rounded down to the hardware's capabilities (according to the | |
193 | * entries in the var structure). Return != 0 for invalid regno. | |
194 | */ | |
195 | static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
196 | u_int transp, struct fb_info *info) | |
197 | { | |
c771eba1 AD |
198 | if (regno < 16) { |
199 | red >>= 8; | |
200 | green >>= 8; | |
201 | blue >>= 8; | |
202 | ||
203 | ((u32*)(info->pseudo_palette))[regno] = (red << 16) | | |
204 | (green << 8) | blue; | |
205 | } | |
1da177e4 | 206 | |
1da177e4 LT |
207 | return 0; |
208 | } | |
209 | ||
210 | /* | |
211 | * Initialisation | |
212 | */ | |
213 | ||
48c68c4f | 214 | static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id); |
1da177e4 | 215 | |
48c68c4f | 216 | static struct zorro_device_id fm2fb_devices[] = { |
1da177e4 LT |
217 | { ZORRO_PROD_BSC_FRAMEMASTER_II }, |
218 | { ZORRO_PROD_HELFRICH_RAINBOW_II }, | |
219 | { 0 } | |
220 | }; | |
bf54a2b3 | 221 | MODULE_DEVICE_TABLE(zorro, fm2fb_devices); |
1da177e4 LT |
222 | |
223 | static struct zorro_driver fm2fb_driver = { | |
224 | .name = "fm2fb", | |
225 | .id_table = fm2fb_devices, | |
226 | .probe = fm2fb_probe, | |
227 | }; | |
228 | ||
48c68c4f | 229 | static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id) |
1da177e4 LT |
230 | { |
231 | struct fb_info *info; | |
232 | unsigned long *ptr; | |
233 | int is_fm; | |
234 | int x, y; | |
235 | ||
236 | is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II; | |
237 | ||
238 | if (!zorro_request_device(z,"fm2fb")) | |
239 | return -ENXIO; | |
240 | ||
c771eba1 | 241 | info = framebuffer_alloc(16 * sizeof(u32), &z->dev); |
1da177e4 LT |
242 | if (!info) { |
243 | zorro_release_device(z); | |
244 | return -ENOMEM; | |
245 | } | |
246 | ||
247 | if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { | |
248 | framebuffer_release(info); | |
249 | zorro_release_device(z); | |
250 | return -ENOMEM; | |
251 | } | |
252 | ||
253 | /* assigning memory to kernel space */ | |
254 | fb_fix.smem_start = zorro_resource_start(z); | |
255 | info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE); | |
256 | fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG; | |
257 | fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG); | |
258 | ||
259 | strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II"); | |
260 | ||
261 | /* make EBU color bars on display */ | |
262 | ptr = (unsigned long *)fb_fix.smem_start; | |
263 | for (y = 0; y < 576; y++) { | |
264 | for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */ | |
265 | for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */ | |
266 | for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */ | |
267 | for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */ | |
268 | for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */ | |
269 | for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */ | |
270 | for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */ | |
271 | for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */ | |
272 | } | |
273 | fm2fb_blank(0, info); | |
274 | ||
275 | if (fm2fb_mode == -1) | |
276 | fm2fb_mode = FM2FB_MODE_PAL; | |
277 | ||
278 | info->fbops = &fm2fb_ops; | |
279 | info->var = fb_var_modes[fm2fb_mode]; | |
280 | info->pseudo_palette = info->par; | |
281 | info->par = NULL; | |
282 | info->fix = fb_fix; | |
283 | info->flags = FBINFO_DEFAULT; | |
284 | ||
285 | if (register_framebuffer(info) < 0) { | |
286 | fb_dealloc_cmap(&info->cmap); | |
1b3349fa | 287 | iounmap(info->screen_base); |
1da177e4 LT |
288 | framebuffer_release(info); |
289 | zorro_release_device(z); | |
290 | return -EINVAL; | |
291 | } | |
292 | printk("fb%d: %s frame buffer device\n", info->node, fb_fix.id); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | int __init fm2fb_setup(char *options) | |
297 | { | |
298 | char *this_opt; | |
299 | ||
300 | if (!options || !*options) | |
301 | return 0; | |
302 | ||
303 | while ((this_opt = strsep(&options, ",")) != NULL) { | |
304 | if (!strncmp(this_opt, "pal", 3)) | |
305 | fm2fb_mode = FM2FB_MODE_PAL; | |
306 | else if (!strncmp(this_opt, "ntsc", 4)) | |
307 | fm2fb_mode = FM2FB_MODE_NTSC; | |
308 | } | |
309 | return 0; | |
310 | } | |
311 | ||
312 | int __init fm2fb_init(void) | |
313 | { | |
314 | char *option = NULL; | |
315 | ||
316 | if (fb_get_options("fm2fb", &option)) | |
317 | return -ENODEV; | |
318 | fm2fb_setup(option); | |
319 | return zorro_register_driver(&fm2fb_driver); | |
320 | } | |
321 | ||
322 | module_init(fm2fb_init); | |
323 | MODULE_LICENSE("GPL"); |