1 /*
2 * linux/drivers/video/kyro/STG4000VTG.c
3 *
4 * Copyright (C) 2002 STMicroelectronics
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11 #include <linux/types.h>
12 #include <video/kyro.h>
13
14 #include "STG4000Reg.h"
15 #include "STG4000Interface.h"
16
17 void DisableVGA(volatile STG4000REG __iomem *pSTGReg)
18 {
19 u32 tmp;
20 volatile u32 count, i;
21
22 /* Reset the VGA registers */
23 tmp = STG_READ_REG(SoftwareReset);
24 CLEAR_BIT(8);
25 STG_WRITE_REG(SoftwareReset, tmp);
26
27 /* Just for Delay */
28 for (i = 0; i < 1000; i++) {
29 count++;
30 }
31
32 /* Pull-out the VGA registers from reset */
33 tmp = STG_READ_REG(SoftwareReset);
34 tmp |= SET_BIT(8);
35 STG_WRITE_REG(SoftwareReset, tmp);
36 }
37
38 void StopVTG(volatile STG4000REG __iomem *pSTGReg)
39 {
40 u32 tmp = 0;
41
42 /* Stop Ver and Hor Sync Generator */
43 tmp = (STG_READ_REG(DACSyncCtrl)) | SET_BIT(0) | SET_BIT(2);
44 CLEAR_BIT(31);
45 STG_WRITE_REG(DACSyncCtrl, tmp);
46 }
47
48 void StartVTG(volatile STG4000REG __iomem *pSTGReg)
49 {
50 u32 tmp = 0;
51
52 /* Start Ver and Hor Sync Generator */
53 tmp = ((STG_READ_REG(DACSyncCtrl)) | SET_BIT(31));
54 CLEAR_BIT(0);
55 CLEAR_BIT(2);
56 STG_WRITE_REG(DACSyncCtrl, tmp);
57 }
58
59 void SetupVTG(volatile STG4000REG __iomem *pSTGReg,
60 const struct kyrofb_info * pTiming)
61 {
62 u32 tmp = 0;
63 u32 margins = 0;
64 u32 ulBorder;
65 u32 xRes = pTiming->XRES;
66 u32 yRes = pTiming->YRES;
67
68 /* Horizontal */
69 u32 HAddrTime, HRightBorder, HLeftBorder;
70 u32 HBackPorcStrt, HFrontPorchStrt, HTotal,
71 HLeftBorderStrt, HRightBorderStrt, HDisplayStrt;
72
73 /* Vertical */
74 u32 VDisplayStrt, VBottomBorder, VTopBorder;
75 u32 VBackPorchStrt, VTotal, VTopBorderStrt,
76 VFrontPorchStrt, VBottomBorderStrt, VAddrTime;
77
78 /* Need to calculate the right border */
79 if ((xRes == 640) && (yRes == 480)) {
80 if ((pTiming->VFREQ == 60) || (pTiming->VFREQ == 72)) {
81 margins = 8;
82 }
83 }
84
85 /* Work out the Border */
86 ulBorder =
87 (pTiming->HTot -
88 (pTiming->HST + (pTiming->HBP - margins) + xRes +
89 (pTiming->HFP - margins))) >> 1;
90
91 /* Border the same for Vertical and Horizontal */
92 VBottomBorder = HLeftBorder = VTopBorder = HRightBorder = ulBorder;
93
94 /************ Get Timing values for Horizontal ******************/
95 HAddrTime = xRes;
96 HBackPorcStrt = pTiming->HST;
97 HTotal = pTiming->HTot;
98 HDisplayStrt =
99 pTiming->HST + (pTiming->HBP - margins) + HLeftBorder;
100 HLeftBorderStrt = HDisplayStrt - HLeftBorder;
101 HFrontPorchStrt =
102 pTiming->HST + (pTiming->HBP - margins) + HLeftBorder +
103 HAddrTime + HRightBorder;
104 HRightBorderStrt = HFrontPorchStrt - HRightBorder;
105
106 /************ Get Timing values for Vertical ******************/
107 VAddrTime = yRes;
108 VBackPorchStrt = pTiming->VST;
109 VTotal = pTiming->VTot;
110 VDisplayStrt =
111 pTiming->VST + (pTiming->VBP - margins) + VTopBorder;
112 VTopBorderStrt = VDisplayStrt - VTopBorder;
113 VFrontPorchStrt =
114 pTiming->VST + (pTiming->VBP - margins) + VTopBorder +
115 VAddrTime + VBottomBorder;
116 VBottomBorderStrt = VFrontPorchStrt - VBottomBorder;
117
118 /* Set Hor Timing 1, 2, 3 */
119 tmp = STG_READ_REG(DACHorTim1);
120 CLEAR_BITS_FRM_TO(0, 11);
121 CLEAR_BITS_FRM_TO(16, 27);
122 tmp |= (HTotal) | (HBackPorcStrt << 16);
123 STG_WRITE_REG(DACHorTim1, tmp);
124
125 tmp = STG_READ_REG(DACHorTim2);
126 CLEAR_BITS_FRM_TO(0, 11);
127 CLEAR_BITS_FRM_TO(16, 27);
128 tmp |= (HDisplayStrt << 16) | HLeftBorderStrt;
129 STG_WRITE_REG(DACHorTim2, tmp);
130
131 tmp = STG_READ_REG(DACHorTim3);
132 CLEAR_BITS_FRM_TO(0, 11);
133 CLEAR_BITS_FRM_TO(16, 27);
134 tmp |= (HFrontPorchStrt << 16) | HRightBorderStrt;
135 STG_WRITE_REG(DACHorTim3, tmp);
136
137 /* Set Ver Timing 1, 2, 3 */
138 tmp = STG_READ_REG(DACVerTim1);
139 CLEAR_BITS_FRM_TO(0, 11);
140 CLEAR_BITS_FRM_TO(16, 27);
141 tmp |= (VBackPorchStrt << 16) | (VTotal);
142 STG_WRITE_REG(DACVerTim1, tmp);
143
144 tmp = STG_READ_REG(DACVerTim2);
145 CLEAR_BITS_FRM_TO(0, 11);
146 CLEAR_BITS_FRM_TO(16, 27);
147 tmp |= (VDisplayStrt << 16) | VTopBorderStrt;
148 STG_WRITE_REG(DACVerTim2, tmp);
149
150 tmp = STG_READ_REG(DACVerTim3);
151 CLEAR_BITS_FRM_TO(0, 11);
152 CLEAR_BITS_FRM_TO(16, 27);
153 tmp |= (VFrontPorchStrt << 16) | VBottomBorderStrt;
154 STG_WRITE_REG(DACVerTim3, tmp);
155
156 /* Set Verical and Horizontal Polarity */
157 tmp = STG_READ_REG(DACSyncCtrl) | SET_BIT(3) | SET_BIT(1);
158
159 if ((pTiming->HSP > 0) && (pTiming->VSP < 0)) { /* +hsync -vsync */
160 tmp &= ~0x8;
161 } else if ((pTiming->HSP < 0) && (pTiming->VSP > 0)) { /* -hsync +vsync */
162 tmp &= ~0x2;
163 } else if ((pTiming->HSP < 0) && (pTiming->VSP < 0)) { /* -hsync -vsync */
164 tmp &= ~0xA;
165 } else if ((pTiming->HSP > 0) && (pTiming->VSP > 0)) { /* +hsync -vsync */
166 tmp &= ~0x0;
167 }
168
169 STG_WRITE_REG(DACSyncCtrl, tmp);
170 }
171
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