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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/bt431.h | |
3 | * | |
4 | * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> | |
90c83176 | 5 | * Copyright 2016 Maciej W. Rozycki <macro@linux-mips.org> |
1da177e4 LT |
6 | * |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file COPYING in the main directory of this | |
9 | * archive for more details. | |
10 | */ | |
11 | #include <linux/types.h> | |
1da177e4 | 12 | |
90c83176 MR |
13 | #define BT431_CURSOR_SIZE 64 |
14 | ||
1da177e4 LT |
15 | /* |
16 | * Bt431 cursor generator registers, 32-bit aligned. | |
17 | * Two twin Bt431 are used on the DECstation's PMAG-AA. | |
18 | */ | |
19 | struct bt431_regs { | |
20 | volatile u16 addr_lo; | |
21 | u16 pad0; | |
22 | volatile u16 addr_hi; | |
23 | u16 pad1; | |
24 | volatile u16 addr_cmap; | |
25 | u16 pad2; | |
26 | volatile u16 addr_reg; | |
27 | u16 pad3; | |
28 | }; | |
29 | ||
30 | static inline u16 bt431_set_value(u8 val) | |
31 | { | |
32 | return ((val << 8) | (val & 0xff)) & 0xffff; | |
33 | } | |
34 | ||
35 | static inline u8 bt431_get_value(u16 val) | |
36 | { | |
37 | return val & 0xff; | |
38 | } | |
39 | ||
40 | /* | |
41 | * Additional registers addressed indirectly. | |
42 | */ | |
43 | #define BT431_REG_CMD 0x0000 | |
44 | #define BT431_REG_CXLO 0x0001 | |
45 | #define BT431_REG_CXHI 0x0002 | |
46 | #define BT431_REG_CYLO 0x0003 | |
47 | #define BT431_REG_CYHI 0x0004 | |
48 | #define BT431_REG_WXLO 0x0005 | |
49 | #define BT431_REG_WXHI 0x0006 | |
50 | #define BT431_REG_WYLO 0x0007 | |
51 | #define BT431_REG_WYHI 0x0008 | |
52 | #define BT431_REG_WWLO 0x0009 | |
53 | #define BT431_REG_WWHI 0x000a | |
54 | #define BT431_REG_WHLO 0x000b | |
55 | #define BT431_REG_WHHI 0x000c | |
56 | ||
57 | #define BT431_REG_CRAM_BASE 0x0000 | |
58 | #define BT431_REG_CRAM_END 0x01ff | |
59 | ||
60 | /* | |
61 | * Command register. | |
62 | */ | |
63 | #define BT431_CMD_CURS_ENABLE 0x40 | |
64 | #define BT431_CMD_XHAIR_ENABLE 0x20 | |
65 | #define BT431_CMD_OR_CURSORS 0x10 | |
e29f0d55 | 66 | #define BT431_CMD_XOR_CURSORS 0x00 |
1da177e4 LT |
67 | #define BT431_CMD_1_1_MUX 0x00 |
68 | #define BT431_CMD_4_1_MUX 0x04 | |
69 | #define BT431_CMD_5_1_MUX 0x08 | |
70 | #define BT431_CMD_xxx_MUX 0x0c | |
71 | #define BT431_CMD_THICK_1 0x00 | |
72 | #define BT431_CMD_THICK_3 0x01 | |
73 | #define BT431_CMD_THICK_5 0x02 | |
74 | #define BT431_CMD_THICK_7 0x03 | |
75 | ||
76 | static inline void bt431_select_reg(struct bt431_regs *regs, int ir) | |
77 | { | |
78 | /* | |
79 | * The compiler splits the write in two bytes without these | |
80 | * helper variables. | |
81 | */ | |
82 | volatile u16 *lo = &(regs->addr_lo); | |
83 | volatile u16 *hi = &(regs->addr_hi); | |
84 | ||
85 | mb(); | |
86 | *lo = bt431_set_value(ir & 0xff); | |
87 | wmb(); | |
88 | *hi = bt431_set_value((ir >> 8) & 0xff); | |
89 | } | |
90 | ||
91 | /* Autoincrement read/write. */ | |
92 | static inline u8 bt431_read_reg_inc(struct bt431_regs *regs) | |
93 | { | |
94 | /* | |
95 | * The compiler splits the write in two bytes without the | |
96 | * helper variable. | |
97 | */ | |
98 | volatile u16 *r = &(regs->addr_reg); | |
99 | ||
100 | mb(); | |
101 | return bt431_get_value(*r); | |
102 | } | |
103 | ||
104 | static inline void bt431_write_reg_inc(struct bt431_regs *regs, u8 value) | |
105 | { | |
106 | /* | |
107 | * The compiler splits the write in two bytes without the | |
108 | * helper variable. | |
109 | */ | |
110 | volatile u16 *r = &(regs->addr_reg); | |
111 | ||
112 | mb(); | |
113 | *r = bt431_set_value(value); | |
114 | } | |
115 | ||
116 | static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir) | |
117 | { | |
118 | bt431_select_reg(regs, ir); | |
119 | return bt431_read_reg_inc(regs); | |
120 | } | |
121 | ||
122 | static inline void bt431_write_reg(struct bt431_regs *regs, int ir, u8 value) | |
123 | { | |
124 | bt431_select_reg(regs, ir); | |
125 | bt431_write_reg_inc(regs, value); | |
126 | } | |
127 | ||
128 | /* Autoincremented read/write for the cursor map. */ | |
129 | static inline u16 bt431_read_cmap_inc(struct bt431_regs *regs) | |
130 | { | |
131 | /* | |
132 | * The compiler splits the write in two bytes without the | |
133 | * helper variable. | |
134 | */ | |
135 | volatile u16 *r = &(regs->addr_cmap); | |
136 | ||
137 | mb(); | |
138 | return *r; | |
139 | } | |
140 | ||
141 | static inline void bt431_write_cmap_inc(struct bt431_regs *regs, u16 value) | |
142 | { | |
143 | /* | |
144 | * The compiler splits the write in two bytes without the | |
145 | * helper variable. | |
146 | */ | |
147 | volatile u16 *r = &(regs->addr_cmap); | |
148 | ||
149 | mb(); | |
150 | *r = value; | |
151 | } | |
152 | ||
153 | static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr) | |
154 | { | |
155 | bt431_select_reg(regs, cr); | |
156 | return bt431_read_cmap_inc(regs); | |
157 | } | |
158 | ||
159 | static inline void bt431_write_cmap(struct bt431_regs *regs, int cr, u16 value) | |
160 | { | |
161 | bt431_select_reg(regs, cr); | |
162 | bt431_write_cmap_inc(regs, value); | |
163 | } | |
164 | ||
165 | static inline void bt431_enable_cursor(struct bt431_regs *regs) | |
166 | { | |
167 | bt431_write_reg(regs, BT431_REG_CMD, | |
168 | BT431_CMD_CURS_ENABLE | BT431_CMD_OR_CURSORS | |
169 | | BT431_CMD_4_1_MUX | BT431_CMD_THICK_1); | |
170 | } | |
171 | ||
172 | static inline void bt431_erase_cursor(struct bt431_regs *regs) | |
173 | { | |
174 | bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX); | |
175 | } | |
176 | ||
177 | static inline void bt431_position_cursor(struct bt431_regs *regs, u16 x, u16 y) | |
178 | { | |
179 | /* | |
180 | * Magic from the MACH sources. | |
181 | * | |
182 | * Cx = x + D + H - P | |
183 | * P = 37 if 1:1, 52 if 4:1, 57 if 5:1 | |
184 | * D = pixel skew between outdata and external data | |
185 | * H = pixels between HSYNCH falling and active video | |
186 | * | |
187 | * Cy = y + V - 32 | |
188 | * V = scanlines between HSYNCH falling, two or more | |
189 | * clocks after VSYNCH falling, and active video | |
190 | */ | |
191 | x += 412 - 52; | |
192 | y += 68 - 32; | |
193 | ||
194 | /* Use autoincrement. */ | |
195 | bt431_select_reg(regs, BT431_REG_CXLO); | |
196 | bt431_write_reg_inc(regs, x & 0xff); /* BT431_REG_CXLO */ | |
197 | bt431_write_reg_inc(regs, (x >> 8) & 0x0f); /* BT431_REG_CXHI */ | |
198 | bt431_write_reg_inc(regs, y & 0xff); /* BT431_REG_CYLO */ | |
199 | bt431_write_reg_inc(regs, (y >> 8) & 0x0f); /* BT431_REG_CYHI */ | |
200 | } | |
201 | ||
90c83176 MR |
202 | static inline void bt431_set_cursor(struct bt431_regs *regs, |
203 | const char *data, const char *mask, | |
204 | u16 rop, u16 width, u16 height) | |
1da177e4 | 205 | { |
90c83176 | 206 | u16 x, y; |
1da177e4 | 207 | int i; |
1da177e4 | 208 | |
90c83176 MR |
209 | i = 0; |
210 | width = DIV_ROUND_UP(width, 8); | |
1da177e4 | 211 | bt431_select_reg(regs, BT431_REG_CRAM_BASE); |
90c83176 MR |
212 | for (y = 0; y < BT431_CURSOR_SIZE; y++) |
213 | for (x = 0; x < BT431_CURSOR_SIZE / 8; x++) { | |
214 | u16 val = 0; | |
215 | ||
216 | if (y < height && x < width) { | |
217 | val = mask[i]; | |
218 | if (rop == ROP_XOR) | |
219 | val = (val << 8) | (val ^ data[i]); | |
220 | else | |
221 | val = (val << 8) | (val & data[i]); | |
222 | i++; | |
223 | } | |
224 | bt431_write_cmap_inc(regs, val); | |
225 | } | |
1da177e4 LT |
226 | } |
227 | ||
228 | static inline void bt431_init_cursor(struct bt431_regs *regs) | |
229 | { | |
230 | /* no crosshair window */ | |
231 | bt431_select_reg(regs, BT431_REG_WXLO); | |
232 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXLO */ | |
233 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXHI */ | |
234 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYLO */ | |
235 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYHI */ | |
236 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWLO */ | |
237 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWHI */ | |
238 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHLO */ | |
239 | bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHHI */ | |
240 | } |