2 * linux/drivers/video/bt431.h
4 * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
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.
10 #include <linux/types.h>
11 #include <asm/system.h>
14 * Bt431 cursor generator registers, 32-bit aligned.
15 * Two twin Bt431 are used on the DECstation's PMAG-AA.
22 volatile u16 addr_cmap;
24 volatile u16 addr_reg;
28 static inline u16 bt431_set_value(u8 val)
30 return ((val << 8) | (val & 0xff)) & 0xffff;
33 static inline u8 bt431_get_value(u16 val)
39 * Additional registers addressed indirectly.
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
55 #define BT431_REG_CRAM_BASE 0x0000
56 #define BT431_REG_CRAM_END 0x01ff
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
74 static inline void bt431_select_reg(struct bt431_regs *regs, int ir)
77 * The compiler splits the write in two bytes without these
80 volatile u16 *lo = &(regs->addr_lo);
81 volatile u16 *hi = &(regs->addr_hi);
84 *lo = bt431_set_value(ir & 0xff);
86 *hi = bt431_set_value((ir >> 8) & 0xff);
89 /* Autoincrement read/write. */
90 static inline u8 bt431_read_reg_inc(struct bt431_regs *regs)
93 * The compiler splits the write in two bytes without the
96 volatile u16 *r = &(regs->addr_reg);
99 return bt431_get_value(*r);
102 static inline void bt431_write_reg_inc(struct bt431_regs *regs, u8 value)
105 * The compiler splits the write in two bytes without the
108 volatile u16 *r = &(regs->addr_reg);
111 *r = bt431_set_value(value);
114 static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir)
116 bt431_select_reg(regs, ir);
117 return bt431_read_reg_inc(regs);
120 static inline void bt431_write_reg(struct bt431_regs *regs, int ir, u8 value)
122 bt431_select_reg(regs, ir);
123 bt431_write_reg_inc(regs, value);
126 /* Autoincremented read/write for the cursor map. */
127 static inline u16 bt431_read_cmap_inc(struct bt431_regs *regs)
130 * The compiler splits the write in two bytes without the
133 volatile u16 *r = &(regs->addr_cmap);
139 static inline void bt431_write_cmap_inc(struct bt431_regs *regs, u16 value)
142 * The compiler splits the write in two bytes without the
145 volatile u16 *r = &(regs->addr_cmap);
151 static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr)
153 bt431_select_reg(regs, cr);
154 return bt431_read_cmap_inc(regs);
157 static inline void bt431_write_cmap(struct bt431_regs *regs, int cr, u16 value)
159 bt431_select_reg(regs, cr);
160 bt431_write_cmap_inc(regs, value);
163 static inline void bt431_enable_cursor(struct bt431_regs *regs)
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);
170 static inline void bt431_erase_cursor(struct bt431_regs *regs)
172 bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX);
175 static inline void bt431_position_cursor(struct bt431_regs *regs, u16 x, u16 y)
178 * Magic from the MACH sources.
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
186 * V = scanlines between HSYNCH falling, two or more
187 * clocks after VSYNCH falling, and active video
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 */
200 static inline void bt431_set_font(struct bt431_regs *regs, u8 fgc,
201 u16 width, u16 height)
204 u16 fgp = fgc ? 0xffff : 0x0000;
205 u16 bgp = fgc ? 0x0000 : 0xffff;
207 bt431_select_reg(regs, BT431_REG_CRAM_BASE);
208 for (i = BT431_REG_CRAM_BASE; i <= BT431_REG_CRAM_END; i++) {
211 if (height << 6 <= i << 3)
213 else if (width <= i % 8 << 3)
215 else if (((width >> 3) & 0xffff) > i % 8)
218 value = fgp & ~(bgp << (width % 8 << 1));
220 bt431_write_cmap_inc(regs, value);
224 static inline void bt431_init_cursor(struct bt431_regs *regs)
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 */