1/*
2 * SiS 300/540/630[S]/730[S]
3 * SiS 315[E|PRO]/550/[M]65x/[M]66x[F|M|G]X/[M]74x[GX]/330/[M]76x[GX]
4 * XGI V3XT/V5/V8, Z7
5 * frame buffer driver for Linux kernels >= 2.4.14 and >=2.6.3
6 *
7 * Linux kernel specific extensions to init.c/init301.c
8 *
9 * Copyright (C) 2001-2005 Thomas Winischhofer, Vienna, Austria.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the named License,
14 * or any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
24 *
25 * Author:	Thomas Winischhofer <thomas@winischhofer.net>
26 */
27
28#include "osdef.h"
29#include "initdef.h"
30#include "vgatypes.h"
31#include "vstruct.h"
32
33#include <linux/version.h>
34#include <linux/types.h>
35#include <linux/fb.h>
36
37int		sisfb_mode_rate_to_dclock(struct SiS_Private *SiS_Pr,
38			unsigned char modeno, unsigned char rateindex);
39int		sisfb_mode_rate_to_ddata(struct SiS_Private *SiS_Pr, unsigned char modeno,
40			unsigned char rateindex, struct fb_var_screeninfo *var);
41bool		sisfb_gettotalfrommode(struct SiS_Private *SiS_Pr, unsigned char modeno,
42			int *htotal, int *vtotal, unsigned char rateindex);
43
44extern bool	SiSInitPtr(struct SiS_Private *SiS_Pr);
45extern bool	SiS_SearchModeID(struct SiS_Private *SiS_Pr, unsigned short *ModeNo,
46			unsigned short *ModeIdIndex);
47extern void	SiS_Generic_ConvertCRData(struct SiS_Private *SiS_Pr, unsigned char *crdata,
48			int xres, int yres, struct fb_var_screeninfo *var, bool writeres);
49
50int
51sisfb_mode_rate_to_dclock(struct SiS_Private *SiS_Pr, unsigned char modeno,
52			unsigned char rateindex)
53{
54    unsigned short ModeNo = modeno;
55    unsigned short ModeIdIndex = 0, ClockIndex = 0;
56    unsigned short RRTI = 0;
57    int Clock;
58
59    if(!SiSInitPtr(SiS_Pr)) return 65000;
60
61    if(rateindex > 0) rateindex--;
62
63#ifdef SIS315H
64    switch(ModeNo) {
65    case 0x5a: ModeNo = 0x50; break;
66    case 0x5b: ModeNo = 0x56;
67    }
68#endif
69
70    if(!(SiS_SearchModeID(SiS_Pr, &ModeNo, &ModeIdIndex))) {;
71       printk(KERN_ERR "Could not find mode %x\n", ModeNo);
72       return 65000;
73    }
74
75    RRTI = SiS_Pr->SiS_EModeIDTable[ModeIdIndex].REFindex;
76
77    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & HaveWideTiming) {
78       if(SiS_Pr->SiS_UseWide == 1) {
79	  /* Wide screen: Ignore rateindex */
80	  ClockIndex = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRTVCLK_WIDE;
81       } else {
82	  RRTI += rateindex;
83	  ClockIndex = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRTVCLK_NORM;
84       }
85    } else {
86       RRTI += rateindex;
87       ClockIndex = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRTVCLK;
88    }
89
90    Clock = SiS_Pr->SiS_VCLKData[ClockIndex].CLOCK * 1000;
91
92    return Clock;
93}
94
95int
96sisfb_mode_rate_to_ddata(struct SiS_Private *SiS_Pr, unsigned char modeno,
97			unsigned char rateindex, struct fb_var_screeninfo *var)
98{
99    unsigned short ModeNo = modeno;
100    unsigned short ModeIdIndex = 0, index = 0, RRTI = 0;
101    int            j;
102
103    if(!SiSInitPtr(SiS_Pr)) return 0;
104
105    if(rateindex > 0) rateindex--;
106
107#ifdef SIS315H
108    switch(ModeNo) {
109       case 0x5a: ModeNo = 0x50; break;
110       case 0x5b: ModeNo = 0x56;
111    }
112#endif
113
114    if(!(SiS_SearchModeID(SiS_Pr, &ModeNo, &ModeIdIndex))) return 0;
115
116    RRTI = SiS_Pr->SiS_EModeIDTable[ModeIdIndex].REFindex;
117    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & HaveWideTiming) {
118       if(SiS_Pr->SiS_UseWide == 1) {
119	  /* Wide screen: Ignore rateindex */
120	  index = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRT1CRTC_WIDE;
121       } else {
122	  RRTI += rateindex;
123	  index = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRT1CRTC_NORM;
124       }
125    } else {
126       RRTI += rateindex;
127       index = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRT1CRTC;
128    }
129
130    SiS_Generic_ConvertCRData(SiS_Pr,
131			(unsigned char *)&SiS_Pr->SiS_CRT1Table[index].CR[0],
132			SiS_Pr->SiS_RefIndex[RRTI].XRes,
133			SiS_Pr->SiS_RefIndex[RRTI].YRes,
134			var, false);
135
136    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & 0x8000)
137       var->sync &= ~FB_SYNC_VERT_HIGH_ACT;
138    else
139       var->sync |= FB_SYNC_VERT_HIGH_ACT;
140
141    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & 0x4000)
142       var->sync &= ~FB_SYNC_HOR_HIGH_ACT;
143    else
144       var->sync |= FB_SYNC_HOR_HIGH_ACT;
145
146    var->vmode = FB_VMODE_NONINTERLACED;
147    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & 0x0080)
148       var->vmode = FB_VMODE_INTERLACED;
149    else {
150       j = 0;
151       while(SiS_Pr->SiS_EModeIDTable[j].Ext_ModeID != 0xff) {
152	  if(SiS_Pr->SiS_EModeIDTable[j].Ext_ModeID ==
153	                  SiS_Pr->SiS_RefIndex[RRTI].ModeID) {
154	      if(SiS_Pr->SiS_EModeIDTable[j].Ext_ModeFlag & DoubleScanMode) {
155	      	  var->vmode = FB_VMODE_DOUBLE;
156	      }
157	      break;
158	  }
159	  j++;
160       }
161    }
162
163    if((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
164    } else if((var->vmode & FB_VMODE_MASK) == FB_VMODE_DOUBLE) {
165       var->upper_margin >>= 1;
166       var->lower_margin >>= 1;
167       var->vsync_len >>= 1;
168    }
169
170    return 1;
171}
172
173bool
174sisfb_gettotalfrommode(struct SiS_Private *SiS_Pr, unsigned char modeno, int *htotal,
175			int *vtotal, unsigned char rateindex)
176{
177    unsigned short ModeNo = modeno;
178    unsigned short ModeIdIndex = 0, CRT1Index = 0;
179    unsigned short RRTI = 0;
180    unsigned char  sr_data, cr_data, cr_data2;
181
182    if(!SiSInitPtr(SiS_Pr)) return false;
183
184    if(rateindex > 0) rateindex--;
185
186#ifdef SIS315H
187    switch(ModeNo) {
188       case 0x5a: ModeNo = 0x50; break;
189       case 0x5b: ModeNo = 0x56;
190    }
191#endif
192
193    if(!(SiS_SearchModeID(SiS_Pr, &ModeNo, &ModeIdIndex))) return false;
194
195    RRTI = SiS_Pr->SiS_EModeIDTable[ModeIdIndex].REFindex;
196    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & HaveWideTiming) {
197       if(SiS_Pr->SiS_UseWide == 1) {
198	  /* Wide screen: Ignore rateindex */
199	  CRT1Index = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRT1CRTC_WIDE;
200       } else {
201	  RRTI += rateindex;
202	  CRT1Index = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRT1CRTC_NORM;
203       }
204    } else {
205       RRTI += rateindex;
206       CRT1Index = SiS_Pr->SiS_RefIndex[RRTI].Ext_CRT1CRTC;
207    }
208
209    sr_data = SiS_Pr->SiS_CRT1Table[CRT1Index].CR[14];
210    cr_data = SiS_Pr->SiS_CRT1Table[CRT1Index].CR[0];
211    *htotal = (((cr_data & 0xff) | ((unsigned short) (sr_data & 0x03) << 8)) + 5) * 8;
212
213    sr_data = SiS_Pr->SiS_CRT1Table[CRT1Index].CR[13];
214    cr_data = SiS_Pr->SiS_CRT1Table[CRT1Index].CR[6];
215    cr_data2 = SiS_Pr->SiS_CRT1Table[CRT1Index].CR[7];
216    *vtotal = ((cr_data & 0xFF) |
217	       ((unsigned short)(cr_data2 & 0x01) <<  8) |
218	       ((unsigned short)(cr_data2 & 0x20) <<  4) |
219	       ((unsigned short)(sr_data  & 0x01) << 10)) + 2;
220
221    if(SiS_Pr->SiS_RefIndex[RRTI].Ext_InfoFlag & InterlaceMode)
222       *vtotal *= 2;
223
224    return true;
225}
226