1 /*-*- linux-c -*-
2  *  linux/drivers/video/i810_dvt.c -- Intel 810 Discrete Video Timings (Intel)
3  *
4  *      Copyright (C) 2001 Antonino Daplas<adaplas@pol.net>
5  *      All Rights Reserved
6  *
7  *
8  *  This file is subject to the terms and conditions of the GNU General Public
9  *  License. See the file COPYING in the main directory of this archive for
10  *  more details.
11  */
12 
13 #include <linux/kernel.h>
14 
15 #include "i810_regs.h"
16 #include "i810.h"
17 
18 struct mode_registers std_modes[] = {
19 	/* 640x480 @ 60Hz */
20 	{ 25000, 0x0013, 0x0003, 0x40, 0x5F, 0x4F, 0x50, 0x82, 0x51, 0x9D,
21 	  0x0B, 0x10, 0x40, 0xE9, 0x0B, 0xDF, 0x50, 0xE7, 0x04, 0x02,
22 	  0x01, 0x01, 0x01, 0x00, 0x01, 0x22002000, 0x22004000, 0x22006000,
23 	  0x22002000, 0x22004000, 0x22006000, 0xC0 },
24 
25 	/* 640x480 @ 70Hz */
26 	{ 28000, 0x0053, 0x0010, 0x40, 0x61, 0x4F, 0x4F, 0x85, 0x52, 0x9A,
27 	  0xF2, 0x10, 0x40, 0xE0, 0x03, 0xDF, 0x50, 0xDF, 0xF3, 0x01,
28 	  0x01, 0x01, 0x01, 0x00, 0x01, 0x22002000, 0x22004000, 0x22005000,
29           0x22002000, 0x22004000, 0x22005000, 0xC0 },
30 
31         /* 640x480 @ 72Hz */
32         { 31000, 0x0013, 0x0002, 0x40, 0x63, 0x4F, 0x4F, 0x87, 0x52, 0x97,
33           0x06, 0x0F, 0x40, 0xE8, 0x0B, 0xDF, 0x50, 0xDF, 0x07, 0x02,
34           0x01, 0x01, 0x01, 0x00, 0x01, 0x22003000, 0x22005000, 0x22007000,
35           0x22003000, 0x22005000, 0x22007000, 0xC0 },
36 
37         /* 640x480 @ 75Hz */
38         { 31000, 0x0013, 0x0002, 0x40, 0x64, 0x4F, 0x4F, 0x88, 0x51, 0x99,
39           0xF2, 0x10, 0x40, 0xE0, 0x03, 0xDF, 0x50, 0xDF, 0xF3, 0x01,
40           0x01, 0x01, 0x01, 0x00, 0x01, 0x22003000, 0x22005000, 0x22007000,
41           0x22003000, 0x22005000, 0x22007000, 0xC0 },
42 
43         /* 640x480 @ 85Hz */
44         { 36000, 0x0010, 0x0001, 0x40, 0x63, 0x4F, 0x4F, 0x87, 0x56, 0x9D,
45           0xFB, 0x10, 0x40, 0xE0, 0x03, 0xDF, 0x50, 0xDF, 0xFC, 0x01,
46           0x01, 0x01, 0x01, 0x00, 0x01, 0x22003000, 0x22005000, 0x22107000,
47           0x22003000, 0x22005000, 0x22107000, 0xC0 },
48 
49         /* 800x600 @ 56Hz */
50         { 36000, 0x0010, 0x0001, 0x40, 0x7B, 0x63, 0x63, 0x9F, 0x66, 0x8F,
51           0x6F, 0x10, 0x40, 0x58, 0x0A, 0x57, 0xC8, 0x57, 0x70, 0x02,
52           0x02, 0x02, 0x02, 0x00, 0x01, 0x22003000, 0x22005000, 0x22107000,
53           0x22003000, 0x22005000, 0x22107000, 0x00 },
54 
55         /* 800x600 @ 60Hz */
56         { 40000, 0x0008, 0x0001, 0x30, 0x7F, 0x63, 0x63, 0x83, 0x68, 0x18,
57           0x72, 0x10, 0x40, 0x58, 0x0C, 0x57, 0xC8, 0x57, 0x73, 0x02,
58           0x02, 0x02, 0x02, 0x00, 0x00, 0x22003000, 0x22006000, 0x22108000,
59           0x22003000, 0x22006000, 0x22108000, 0x00 },
60 
61         /* 800x600 @ 70Hz */
62         { 45000, 0x0054, 0x0015, 0x30, 0x7D, 0x63, 0x63, 0x81, 0x68, 0x12,
63           0x6f, 0x10, 0x40, 0x58, 0x0b, 0x57, 0x64, 0x57, 0x70, 0x02,
64           0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22007000, 0x2210A000,
65           0x22004000, 0x22007000, 0x2210A000, 0x00 },
66 
67         /* 800x600 @ 72Hz */
68         { 50000, 0x0017, 0x0004, 0x30, 0x7D, 0x63, 0x63, 0x81, 0x6A, 0x19,
69           0x98, 0x10, 0x40, 0x7C, 0x02, 0x57, 0xC8, 0x57, 0x99, 0x02,
70           0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22007000, 0x2210A000,
71           0x22004000, 0x22007000, 0x2210A000, 0x00 },
72 
73         /* 800x600 @ 75Hz */
74         { 49000, 0x001F, 0x0006, 0x30, 0x7F, 0x63, 0x63, 0x83, 0x65, 0x0F,
75           0x6F, 0x10, 0x40, 0x58, 0x0B, 0x57, 0xC8, 0x57, 0x70, 0x02,
76           0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22007000, 0x2210B000,
77           0x22004000, 0x22007000, 0x2210B000, 0x00 },
78 
79         /* 800x600 @ 85Hz */
80         { 56000, 0x0049, 0x000E, 0x30, 0x7E, 0x63, 0x63, 0x82, 0x67, 0x0F,
81           0x75, 0x10, 0x40, 0x58, 0x0B, 0x57, 0xC8, 0x57, 0x76, 0x02,
82           0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22108000, 0x2210b000,
83           0x22004000, 0x22108000, 0x2210b000, 0x00 },
84 
85         /* 1024x768 @ 60Hz */
86         { 65000, 0x003F, 0x000A, 0x30, 0xA3, 0x7F, 0x7F, 0x87, 0x83, 0x94,
87           0x24, 0x10, 0x40, 0x02, 0x08, 0xFF, 0x80, 0xFF, 0x25, 0x03,
88           0x02, 0x03, 0x02, 0x00, 0x00, 0x22005000, 0x22109000, 0x2220D000,
89           0x22005000, 0x22109000, 0x2220D000, 0xC0 },
90 
91         /* 1024x768 @ 70Hz */
92 	{ 75000, 0x0017, 0x0002, 0x30, 0xA1, 0x7F, 0x7F, 0x85, 0x82, 0x93,
93 	  0x24, 0x10, 0x40, 0x02, 0x08, 0xFF, 0x80, 0xFF, 0x25, 0x03,
94 	  0x02, 0x03, 0x02, 0x00, 0x00, 0x22005000, 0x2210A000, 0x2220F000,
95 	  0x22005000, 0x2210A000, 0x2220F000, 0xC0 },
96 
97 	/* 1024x768 @ 75Hz */
98 	{ 78000, 0x0050, 0x0017, 0x20, 0x9F, 0x7F, 0x7F, 0x83, 0x81, 0x8D,
99 	  0x1E, 0x10, 0x40, 0x00, 0x03, 0xFF, 0x80, 0xFF, 0x1F, 0x03,
100 	  0x02, 0x03, 0x02, 0x00, 0x00, 0x22006000, 0x2210B000, 0x22210000,
101 	  0x22006000, 0x2210B000, 0x22210000, 0x00 },
102 
103 	/* 1024x768 @ 85Hz */
104 	{ 94000, 0x003D, 0x000E, 0x20, 0xA7, 0x7F, 0x7F, 0x8B, 0x85, 0x91,
105 	  0x26, 0x10, 0x40, 0x00, 0x03, 0xFF, 0x80, 0xFF, 0x27, 0x03,
106 	  0x02, 0x03, 0x02, 0x00, 0x00, 0x22007000, 0x2220E000, 0x22212000,
107 	  0x22007000, 0x2220E000, 0x22212000, 0x00 },
108 
109 	/* 1152x864 @ 60Hz */
110 	{ 80000, 0x0008, 0x0001, 0x20, 0xB3, 0x8F, 0x8F, 0x97, 0x93, 0x9f,
111 	  0x87, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5f, 0x88, 0x03,
112 	  0x03, 0x03, 0x03, 0x00, 0x00, 0x2220C000, 0x22210000, 0x22415000,
113 	  0x2220C000, 0x22210000, 0x22415000, 0x00 },
114 
115 	/* 1152x864 @ 70Hz */
116 	{ 96000, 0x000a, 0x0001, 0x20, 0xbb, 0x8F, 0x8F, 0x9f, 0x98, 0x87,
117 	  0x82, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x83, 0x03,
118 	  0x03, 0x03, 0x03, 0x00, 0x00, 0x22107000, 0x22210000, 0x22415000,
119 	  0x22107000, 0x22210000, 0x22415000, 0x00 },
120 
121 	/* 1152x864 @ 72Hz */
122 	{ 99000, 0x001f, 0x0006, 0x20, 0xbb, 0x8F, 0x8F, 0x9f, 0x98, 0x87,
123 	  0x83, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x84, 0x03,
124 	  0x03, 0x03, 0x03, 0x00, 0x00, 0x22107000, 0x22210000, 0x22415000,
125 	  0x22107000, 0x22210000, 0x22415000, 0x00 },
126 
127 	/* 1152x864 @ 75Hz */
128 	{ 108000, 0x0010, 0x0002, 0x20, 0xC3, 0x8F, 0x8F, 0x87, 0x97, 0x07,
129 	  0x82, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x83, 0x03,
130 	  0x03, 0x03, 0x03, 0x00, 0x01, 0x22107000, 0x22210000, 0x22415000,
131 	  0x22107000, 0x22210000, 0x22415000, 0x00 },
132 
133 	/* 1152x864 @ 85Hz */
134 	{ 121000, 0x006D, 0x0014, 0x20, 0xc0, 0x8F, 0x8F, 0x84, 0x97, 0x07,
135 	  0x93, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x94, 0x03,
136 	  0x03, 0x03, 0x03, 0x00, 0x01, 0x2220C000, 0x22210000, 0x22415000,
137 	  0x2220C000, 0x22210000, 0x22415000, 0x0 },
138 
139 	/* 1280x960 @ 60Hz */
140 	{ 108000, 0x0010, 0x0002, 0x20, 0xDC, 0x9F, 0x9F, 0x80, 0xAB, 0x99,
141 	  0xE6, 0x10, 0x40, 0xC0, 0x03, 0xBF, 0xA0, 0xBF, 0xE7, 0x03,
142 	  0x03, 0x03, 0x03, 0x00, 0x01, 0x2210A000, 0x22210000, 0x22415000,
143 	  0x2210A000, 0x22210000, 0x22415000, 0x00 },
144 
145 	/* 1280x960 @ 75Hz */
146 	{ 129000, 0x0029, 0x0006, 0x20, 0xD3, 0x9F, 0x9F, 0x97, 0xaa, 0x1b,
147 	  0xE8, 0x10, 0x40, 0xC0, 0x03, 0xBF, 0xA0, 0xBF, 0xE9, 0x03,
148 	  0x03, 0x03, 0x03, 0x00, 0x01, 0x2210A000, 0x22210000, 0x2241B000,
149 	  0x2210A000, 0x22210000, 0x2241B000, 0x00 },
150 
151 	/* 1280x960 @ 85Hz */
152 	{ 148000, 0x0042, 0x0009, 0x20, 0xD3, 0x9F, 0x9F, 0x97, 0xA7, 0x1B,
153 	  0xF1, 0x10, 0x40, 0xC0, 0x03, 0xBF, 0xA0, 0xBF, 0xF2, 0x03,
154 	  0x03, 0x03, 0x03, 0x00, 0x01, 0x2210A000, 0x22220000, 0x2241D000,
155 	  0x2210A000, 0x22220000, 0x2241D000, 0x00 },
156 
157 	/* 1600x1200 @ 60Hz */
158 	{ 162000, 0x0019, 0x0006, 0x10, 0x09, 0xC7, 0xC7, 0x8D, 0xcf, 0x07,
159 	  0xE0, 0x10, 0x40, 0xB0, 0x03, 0xAF, 0xC8, 0xAF, 0xE1, 0x04,
160 	  0x04, 0x04, 0x04, 0x01, 0x00, 0x2210b000, 0x22416000, 0x44419000,
161 	  0x2210b000, 0x22416000, 0x44419000, 0x00 },
162 
163 	/* 1600x1200 @ 65 Hz */
164 	{ 175000, 0x005d, 0x0018, 0x10, 0x09, 0xC7, 0xC7, 0x8D, 0xcf, 0x07,
165 	  0xE0, 0x10, 0x40, 0xB0, 0x03, 0xAF, 0xC8, 0xAF, 0xE1, 0x04,
166 	  0x04, 0x04, 0x04, 0x01, 0x00, 0x2210c000, 0x22416000, 0x44419000,
167 	  0x2210c000, 0x22416000, 0x44419000, 0x00 },
168 
169 	/* 1600x1200 @ 70 Hz */
170 	{ 189000, 0x003D, 0x000e, 0x10, 0x09, 0xC7, 0xC7, 0x8d, 0xcf, 0x07,
171 	  0xE0, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xE1, 0x04,
172 	  0x04, 0x04, 0x04, 0x01, 0x00, 0x2220e000, 0x22416000, 0x44419000,
173 	  0x2220e000, 0x22416000, 0x44419000, 0x00 },
174 
175  	/* 1600x1200 @ 72 Hz */
176  	{ 195000, 0x003f, 0x000e, 0x10, 0x0b, 0xC7, 0xC7, 0x8f, 0xd5, 0x0b,
177  	  0xE1, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xe2, 0x04, 0x04,
178  	  0x04, 0x04, 0x01, 0x00, 0x2220e000, 0x22416000, 0x44419000,
179  	  0x2220e000, 0x22416000, 0x44419000, 0x00 },
180 
181  	/* 1600x1200 @ 75 Hz */
182  	{ 202000, 0x0024, 0x0007, 0x10, 0x09, 0xC7, 0xC7, 0x8d, 0xcf, 0x07,
183  	  0xE0, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xE1, 0x04, 0x04,
184  	  0x04, 0x04, 0x01, 0x00, 0x2220e000, 0x22416000, 0x44419000,
185  	  0x2220e000, 0x22416000, 0x44419000,  0x00 },
186 
187  	/* 1600x1200 @ 85 Hz */
188 	{ 229000, 0x0029, 0x0007, 0x10, 0x09, 0xC7, 0xC7, 0x8d, 0xcf, 0x07,
189 	  0xE0, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xE1, 0x04, 0x04,
190 	  0x04, 0x04, 0x01, 0x00, 0x22210000, 0x22416000, 0x0,
191 	  0x22210000, 0x22416000, 0x0, 0x00 },
192 };
193 
194 void round_off_xres(u32 *xres)
195 {
196 	if (*xres <= 640)
197 		*xres = 640;
198 	else if (*xres <= 800)
199 		*xres = 800;
200 	else if (*xres <= 1024)
201 		*xres = 1024;
202 	else if (*xres <= 1152)
203 		*xres = 1152;
204 	else if (*xres <= 1280)
205 		*xres = 1280;
206 	else
207 		*xres = 1600;
208 }
209 
210 inline void round_off_yres(u32 *xres, u32 *yres)
211 {
212 	*yres = (*xres * 3) >> 2;
213 }
214 
215 static int i810fb_find_best_mode(u32 xres, u32 yres, u32 pixclock)
216 {
217 	u32 diff = 0, diff_best = 0xFFFFFFFF, i = 0, i_best = 0;
218 	u8 hfl = (u8) ((xres >> 3) - 1);
219 
220 	for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
221 		if (std_modes[i].cr01 == hfl) {
222 			if (std_modes[i].pixclock <= pixclock)
223 				diff = pixclock - std_modes[i].pixclock;
224 			if (diff < diff_best) {
225 		    		i_best = i;
226 		    		diff_best = diff;
227 			}
228 		}
229 	}
230 	return i_best;
231 }
232 
233 void i810fb_encode_registers(const struct fb_var_screeninfo *var,
234 			     struct i810fb_par *par, u32 xres, u32 yres)
235 {
236 	u32 i_best = i810fb_find_best_mode(xres, yres, par->regs.pixclock);
237 
238 	par->regs = std_modes[i_best];
239 
240 	/* overlay */
241 	par->ovract = ((xres + var->right_margin + var->hsync_len +
242 			var->left_margin - 32) | ((xres - 32) << 16));
243 }
244 
245 void i810fb_fill_var_timings(struct fb_var_screeninfo *var)
246 {
247 	u32 total, xres, yres;
248 	u32 mode, pixclock;
249 
250 	xres = var->xres;
251 	yres = var->yres;
252 
253 	pixclock = 1000000000 / var->pixclock;
254 	mode = i810fb_find_best_mode(xres, yres, pixclock);
255 
256 	total = (std_modes[mode].cr00 | (std_modes[mode].cr35 & 1) << 8) + 3;
257 	total <<= 3;
258 
259 	var->pixclock = 1000000000 / std_modes[mode].pixclock;
260 	var->right_margin = (std_modes[mode].cr04 << 3) - xres;
261 	var->hsync_len = ((std_modes[mode].cr05 & 0x1F) -
262 			 (std_modes[mode].cr04 & 0x1F)) << 3;
263 	var->left_margin = (total - (xres + var->right_margin +
264 				     var->hsync_len));
265 	var->sync = FB_SYNC_ON_GREEN;
266 	if (~(std_modes[mode].msr & (1 << 6)))
267 		var->sync |= FB_SYNC_HOR_HIGH_ACT;
268 	if (~(std_modes[mode].msr & (1 << 7)))
269 		var->sync |= FB_SYNC_VERT_HIGH_ACT;
270 
271 	total = (std_modes[mode].cr06 | (std_modes[mode].cr30 & 0xF)  << 8) + 2;
272 	var->lower_margin = (std_modes[mode].cr10 |
273 			    (std_modes[mode].cr32 & 0x0F) << 8) - yres;
274 	var->vsync_len = (std_modes[mode].cr11 & 0x0F) -
275 			 (var->lower_margin & 0x0F);
276 	var->upper_margin = total - (yres + var->lower_margin + var->vsync_len);
277 }
278 
279 u32 i810_get_watermark(struct fb_var_screeninfo *var,
280 		       struct i810fb_par *par)
281 {
282 	struct mode_registers *params = &par->regs;
283 	u32 wmark = 0;
284 
285 	if (par->mem_freq == 100) {
286 		switch (var->bits_per_pixel) {
287 		case 8:
288 			wmark = params->bpp8_100;
289 			break;
290 		case 16:
291 			wmark = params->bpp16_100;
292 			break;
293 		case 24:
294 		case 32:
295 			wmark = params->bpp24_100;
296 		}
297 	} else {
298 		switch (var->bits_per_pixel) {
299 		case 8:
300 			wmark = params->bpp8_133;
301 			break;
302 		case 16:
303 			wmark = params->bpp16_133;
304 			break;
305 		case 24:
306 		case 32:
307 			wmark = params->bpp24_133;
308 		}
309 	}
310 	return wmark;
311 }
312 
313