Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |