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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/video/bt431.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/video/bt431.h')
-rw-r--r--drivers/video/bt431.h236
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/video/bt431.h b/drivers/video/bt431.h
new file mode 100644
index 000000000000..c826f2787bad
--- /dev/null
+++ b/drivers/video/bt431.h
@@ -0,0 +1,236 @@
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#include <asm/system.h>
12
13/*
14 * Bt431 cursor generator registers, 32-bit aligned.
15 * Two twin Bt431 are used on the DECstation's PMAG-AA.
16 */
17struct bt431_regs {
18 volatile u16 addr_lo;
19 u16 pad0;
20 volatile u16 addr_hi;
21 u16 pad1;
22 volatile u16 addr_cmap;
23 u16 pad2;
24 volatile u16 addr_reg;
25 u16 pad3;
26};
27
28static inline u16 bt431_set_value(u8 val)
29{
30 return ((val << 8) | (val & 0xff)) & 0xffff;
31}
32
33static inline u8 bt431_get_value(u16 val)
34{
35 return val & 0xff;
36}
37
38/*
39 * Additional registers addressed indirectly.
40 */
41#define BT431_REG_CMD 0x0000
42#define BT431_REG_CXLO 0x0001
43#define BT431_REG_CXHI 0x0002
44#define BT431_REG_CYLO 0x0003
45#define BT431_REG_CYHI 0x0004
46#define BT431_REG_WXLO 0x0005
47#define BT431_REG_WXHI 0x0006
48#define BT431_REG_WYLO 0x0007
49#define BT431_REG_WYHI 0x0008
50#define BT431_REG_WWLO 0x0009
51#define BT431_REG_WWHI 0x000a
52#define BT431_REG_WHLO 0x000b
53#define BT431_REG_WHHI 0x000c
54
55#define BT431_REG_CRAM_BASE 0x0000
56#define BT431_REG_CRAM_END 0x01ff
57
58/*
59 * Command register.
60 */
61#define BT431_CMD_CURS_ENABLE 0x40
62#define BT431_CMD_XHAIR_ENABLE 0x20
63#define BT431_CMD_OR_CURSORS 0x10
64#define BT431_CMD_AND_CURSORS 0x00
65#define BT431_CMD_1_1_MUX 0x00
66#define BT431_CMD_4_1_MUX 0x04
67#define BT431_CMD_5_1_MUX 0x08
68#define BT431_CMD_xxx_MUX 0x0c
69#define BT431_CMD_THICK_1 0x00
70#define BT431_CMD_THICK_3 0x01
71#define BT431_CMD_THICK_5 0x02
72#define BT431_CMD_THICK_7 0x03
73
74static inline void bt431_select_reg(struct bt431_regs *regs, int ir)
75{
76 /*
77 * The compiler splits the write in two bytes without these
78 * helper variables.
79 */
80 volatile u16 *lo = &(regs->addr_lo);
81 volatile u16 *hi = &(regs->addr_hi);
82
83 mb();
84 *lo = bt431_set_value(ir & 0xff);
85 wmb();
86 *hi = bt431_set_value((ir >> 8) & 0xff);
87}
88
89/* Autoincrement read/write. */
90static inline u8 bt431_read_reg_inc(struct bt431_regs *regs)
91{
92 /*
93 * The compiler splits the write in two bytes without the
94 * helper variable.
95 */
96 volatile u16 *r = &(regs->addr_reg);
97
98 mb();
99 return bt431_get_value(*r);
100}
101
102static inline void bt431_write_reg_inc(struct bt431_regs *regs, u8 value)
103{
104 /*
105 * The compiler splits the write in two bytes without the
106 * helper variable.
107 */
108 volatile u16 *r = &(regs->addr_reg);
109
110 mb();
111 *r = bt431_set_value(value);
112}
113
114static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir)
115{
116 bt431_select_reg(regs, ir);
117 return bt431_read_reg_inc(regs);
118}
119
120static inline void bt431_write_reg(struct bt431_regs *regs, int ir, u8 value)
121{
122 bt431_select_reg(regs, ir);
123 bt431_write_reg_inc(regs, value);
124}
125
126/* Autoincremented read/write for the cursor map. */
127static inline u16 bt431_read_cmap_inc(struct bt431_regs *regs)
128{
129 /*
130 * The compiler splits the write in two bytes without the
131 * helper variable.
132 */
133 volatile u16 *r = &(regs->addr_cmap);
134
135 mb();
136 return *r;
137}
138
139static inline void bt431_write_cmap_inc(struct bt431_regs *regs, u16 value)
140{
141 /*
142 * The compiler splits the write in two bytes without the
143 * helper variable.
144 */
145 volatile u16 *r = &(regs->addr_cmap);
146
147 mb();
148 *r = value;
149}
150
151static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr)
152{
153 bt431_select_reg(regs, cr);
154 return bt431_read_cmap_inc(regs);
155}
156
157static inline void bt431_write_cmap(struct bt431_regs *regs, int cr, u16 value)
158{
159 bt431_select_reg(regs, cr);
160 bt431_write_cmap_inc(regs, value);
161}
162
163static inline void bt431_enable_cursor(struct bt431_regs *regs)
164{
165 bt431_write_reg(regs, BT431_REG_CMD,
166 BT431_CMD_CURS_ENABLE | BT431_CMD_OR_CURSORS
167 | BT431_CMD_4_1_MUX | BT431_CMD_THICK_1);
168}
169
170static inline void bt431_erase_cursor(struct bt431_regs *regs)
171{
172 bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX);
173}
174
175static inline void bt431_position_cursor(struct bt431_regs *regs, u16 x, u16 y)
176{
177 /*
178 * Magic from the MACH sources.
179 *
180 * Cx = x + D + H - P
181 * P = 37 if 1:1, 52 if 4:1, 57 if 5:1
182 * D = pixel skew between outdata and external data
183 * H = pixels between HSYNCH falling and active video
184 *
185 * Cy = y + V - 32
186 * V = scanlines between HSYNCH falling, two or more
187 * clocks after VSYNCH falling, and active video
188 */
189 x += 412 - 52;
190 y += 68 - 32;
191
192 /* Use autoincrement. */
193 bt431_select_reg(regs, BT431_REG_CXLO);
194 bt431_write_reg_inc(regs, x & 0xff); /* BT431_REG_CXLO */
195 bt431_write_reg_inc(regs, (x >> 8) & 0x0f); /* BT431_REG_CXHI */
196 bt431_write_reg_inc(regs, y & 0xff); /* BT431_REG_CYLO */
197 bt431_write_reg_inc(regs, (y >> 8) & 0x0f); /* BT431_REG_CYHI */
198}
199
200static inline void bt431_set_font(struct bt431_regs *regs, u8 fgc,
201 u16 width, u16 height)
202{
203 int i;
204 u16 fgp = fgc ? 0xffff : 0x0000;
205 u16 bgp = fgc ? 0x0000 : 0xffff;
206
207 bt431_select_reg(regs, BT431_REG_CRAM_BASE);
208 for (i = BT431_REG_CRAM_BASE; i <= BT431_REG_CRAM_END; i++) {
209 u16 value;
210
211 if (height << 6 <= i << 3)
212 value = bgp;
213 else if (width <= i % 8 << 3)
214 value = bgp;
215 else if (((width >> 3) & 0xffff) > i % 8)
216 value = fgp;
217 else
218 value = fgp & ~(bgp << (width % 8 << 1));
219
220 bt431_write_cmap_inc(regs, value);
221 }
222}
223
224static inline void bt431_init_cursor(struct bt431_regs *regs)
225{
226 /* no crosshair window */
227 bt431_select_reg(regs, BT431_REG_WXLO);
228 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXLO */
229 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXHI */
230 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYLO */
231 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYHI */
232 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWLO */
233 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWHI */
234 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHLO */
235 bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHHI */
236}