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1 | /* |
2 | * linux/drivers/video/bt431.h |
3 | * |
4 | * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> |
5 | * |
6 | * This file is subject to the terms and conditions of the GNU General |
7 | * Public License. See the file COPYING in the main directory of this |
8 | * archive for more details. |
9 | */ |
10 | #include <linux/types.h> |
11 | |
12 | /* |
13 | * Bt431 cursor generator registers, 32-bit aligned. |
14 | * Two twin Bt431 are used on the DECstation's PMAG-AA. |
15 | */ |
16 | struct bt431_regs { |
17 | volatile u16 addr_lo; |
18 | u16 pad0; |
19 | volatile u16 addr_hi; |
20 | u16 pad1; |
21 | volatile u16 addr_cmap; |
22 | u16 pad2; |
23 | volatile u16 addr_reg; |
24 | u16 pad3; |
25 | }; |
26 | |
27 | static inline u16 bt431_set_value(u8 val) |
28 | { |
29 | return ((val << 8) | (val & 0xff)) & 0xffff; |
30 | } |
31 | |
32 | static inline u8 bt431_get_value(u16 val) |
33 | { |
34 | return val & 0xff; |
35 | } |
36 | |
37 | /* |
38 | * Additional registers addressed indirectly. |
39 | */ |
40 | #define BT431_REG_CMD 0x0000 |
41 | #define BT431_REG_CXLO 0x0001 |
42 | #define BT431_REG_CXHI 0x0002 |
43 | #define BT431_REG_CYLO 0x0003 |
44 | #define BT431_REG_CYHI 0x0004 |
45 | #define BT431_REG_WXLO 0x0005 |
46 | #define BT431_REG_WXHI 0x0006 |
47 | #define BT431_REG_WYLO 0x0007 |
48 | #define BT431_REG_WYHI 0x0008 |
49 | #define BT431_REG_WWLO 0x0009 |
50 | #define BT431_REG_WWHI 0x000a |
51 | #define BT431_REG_WHLO 0x000b |
52 | #define BT431_REG_WHHI 0x000c |
53 | |
54 | #define BT431_REG_CRAM_BASE 0x0000 |
55 | #define BT431_REG_CRAM_END 0x01ff |
56 | |
57 | /* |
58 | * Command register. |
59 | */ |
60 | #define BT431_CMD_CURS_ENABLE 0x40 |
61 | #define BT431_CMD_XHAIR_ENABLE 0x20 |
62 | #define BT431_CMD_OR_CURSORS 0x10 |
63 | #define BT431_CMD_AND_CURSORS 0x00 |
64 | #define BT431_CMD_1_1_MUX 0x00 |
65 | #define BT431_CMD_4_1_MUX 0x04 |
66 | #define BT431_CMD_5_1_MUX 0x08 |
67 | #define BT431_CMD_xxx_MUX 0x0c |
68 | #define BT431_CMD_THICK_1 0x00 |
69 | #define BT431_CMD_THICK_3 0x01 |
70 | #define BT431_CMD_THICK_5 0x02 |
71 | #define BT431_CMD_THICK_7 0x03 |
72 | |
73 | static inline void bt431_select_reg(struct bt431_regs *regs, int ir) |
74 | { |
75 | /* |
76 | * The compiler splits the write in two bytes without these |
77 | * helper variables. |
78 | */ |
79 | volatile u16 *lo = &(regs->addr_lo); |
80 | volatile u16 *hi = &(regs->addr_hi); |
81 | |
82 | mb(); |
83 | *lo = bt431_set_value(ir & 0xff); |
84 | wmb(); |
85 | *hi = bt431_set_value((ir >> 8) & 0xff); |
86 | } |
87 | |
88 | /* Autoincrement read/write. */ |
89 | static inline u8 bt431_read_reg_inc(struct bt431_regs *regs) |
90 | { |
91 | /* |
92 | * The compiler splits the write in two bytes without the |
93 | * helper variable. |
94 | */ |
95 | volatile u16 *r = &(regs->addr_reg); |
96 | |
97 | mb(); |
98 | return bt431_get_value(*r); |
99 | } |
100 | |
101 | static inline void bt431_write_reg_inc(struct bt431_regs *regs, u8 value) |
102 | { |
103 | /* |
104 | * The compiler splits the write in two bytes without the |
105 | * helper variable. |
106 | */ |
107 | volatile u16 *r = &(regs->addr_reg); |
108 | |
109 | mb(); |
110 | *r = bt431_set_value(value); |
111 | } |
112 | |
113 | static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir) |
114 | { |
115 | bt431_select_reg(regs, ir); |
116 | return bt431_read_reg_inc(regs); |
117 | } |
118 | |
119 | static inline void bt431_write_reg(struct bt431_regs *regs, int ir, u8 value) |
120 | { |
121 | bt431_select_reg(regs, ir); |
122 | bt431_write_reg_inc(regs, value); |
123 | } |
124 | |
125 | /* Autoincremented read/write for the cursor map. */ |
126 | static inline u16 bt431_read_cmap_inc(struct bt431_regs *regs) |
127 | { |
128 | /* |
129 | * The compiler splits the write in two bytes without the |
130 | * helper variable. |
131 | */ |
132 | volatile u16 *r = &(regs->addr_cmap); |
133 | |
134 | mb(); |
135 | return *r; |
136 | } |
137 | |
138 | static inline void bt431_write_cmap_inc(struct bt431_regs *regs, u16 value) |
139 | { |
140 | /* |
141 | * The compiler splits the write in two bytes without the |
142 | * helper variable. |
143 | */ |
144 | volatile u16 *r = &(regs->addr_cmap); |
145 | |
146 | mb(); |
147 | *r = value; |
148 | } |
149 | |
150 | static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr) |
151 | { |
152 | bt431_select_reg(regs, cr); |
153 | return bt431_read_cmap_inc(regs); |
154 | } |
155 | |
156 | static inline void bt431_write_cmap(struct bt431_regs *regs, int cr, u16 value) |
157 | { |
158 | bt431_select_reg(regs, cr); |
159 | bt431_write_cmap_inc(regs, value); |
160 | } |
161 | |
162 | static inline void bt431_enable_cursor(struct bt431_regs *regs) |
163 | { |
164 | bt431_write_reg(regs, BT431_REG_CMD, |
165 | BT431_CMD_CURS_ENABLE | BT431_CMD_OR_CURSORS |
166 | | BT431_CMD_4_1_MUX | BT431_CMD_THICK_1); |
167 | } |
168 | |
169 | static inline void bt431_erase_cursor(struct bt431_regs *regs) |
170 | { |
171 | bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX); |
172 | } |
173 | |
174 | static inline void bt431_position_cursor(struct bt431_regs *regs, u16 x, u16 y) |
175 | { |
176 | /* |
177 | * Magic from the MACH sources. |
178 | * |
179 | * Cx = x + D + H - P |
180 | * P = 37 if 1:1, 52 if 4:1, 57 if 5:1 |
181 | * D = pixel skew between outdata and external data |
182 | * H = pixels between HSYNCH falling and active video |
183 | * |
184 | * Cy = y + V - 32 |
185 | * V = scanlines between HSYNCH falling, two or more |
186 | * clocks after VSYNCH falling, and active video |
187 | */ |
188 | x += 412 - 52; |
189 | y += 68 - 32; |
190 | |
191 | /* Use autoincrement. */ |
192 | bt431_select_reg(regs, BT431_REG_CXLO); |
193 | bt431_write_reg_inc(regs, x & 0xff); /* BT431_REG_CXLO */ |
194 | bt431_write_reg_inc(regs, (x >> 8) & 0x0f); /* BT431_REG_CXHI */ |
195 | bt431_write_reg_inc(regs, y & 0xff); /* BT431_REG_CYLO */ |
196 | bt431_write_reg_inc(regs, (y >> 8) & 0x0f); /* BT431_REG_CYHI */ |
197 | } |
198 | |
199 | static inline void bt431_set_font(struct bt431_regs *regs, u8 fgc, |
200 | u16 width, u16 height) |
201 | { |
202 | int i; |
203 | u16 fgp = fgc ? 0xffff : 0x0000; |
204 | u16 bgp = fgc ? 0x0000 : 0xffff; |
205 | |
206 | bt431_select_reg(regs, BT431_REG_CRAM_BASE); |
207 | for (i = BT431_REG_CRAM_BASE; i <= BT431_REG_CRAM_END; i++) { |
208 | u16 value; |
209 | |
210 | if (height << 6 <= i << 3) |
211 | value = bgp; |
212 | else if (width <= i % 8 << 3) |
213 | value = bgp; |
214 | else if (((width >> 3) & 0xffff) > i % 8) |
215 | value = fgp; |
216 | else |
217 | value = fgp & ~(bgp << (width % 8 << 1)); |
218 | |
219 | bt431_write_cmap_inc(regs, value); |
220 | } |
221 | } |
222 | |
223 | static inline void bt431_init_cursor(struct bt431_regs *regs) |
224 | { |
225 | /* no crosshair window */ |
226 | bt431_select_reg(regs, BT431_REG_WXLO); |
227 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXLO */ |
228 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXHI */ |
229 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYLO */ |
230 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYHI */ |
231 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWLO */ |
232 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWHI */ |
233 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHLO */ |
234 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHHI */ |
235 | } |
236 |
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