| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/video/bt455.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 | * Bt455 byte-wide registers, 32-bit aligned. |
| 15 | */ |
| 16 | struct bt455_regs { |
| 17 | volatile u8 addr_cmap; |
| 18 | u8 pad0[3]; |
| 19 | volatile u8 addr_cmap_data; |
| 20 | u8 pad1[3]; |
| 21 | volatile u8 addr_clr; |
| 22 | u8 pad2[3]; |
| 23 | volatile u8 addr_ovly; |
| 24 | u8 pad3[3]; |
| 25 | }; |
| 26 | |
| 27 | static inline void bt455_select_reg(struct bt455_regs *regs, int ir) |
| 28 | { |
| 29 | mb(); |
| 30 | regs->addr_cmap = ir & 0x0f; |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * Read/write to a Bt455 color map register. |
| 35 | */ |
| 36 | static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr, |
| 37 | u8* red, u8* green, u8* blue) |
| 38 | { |
| 39 | bt455_select_reg(regs, cr); |
| 40 | mb(); |
| 41 | *red = regs->addr_cmap_data & 0x0f; |
| 42 | rmb(); |
| 43 | *green = regs->addr_cmap_data & 0x0f; |
| 44 | rmb(); |
| 45 | *blue = regs->addr_cmap_data & 0x0f; |
| 46 | } |
| 47 | |
| 48 | static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr, |
| 49 | u8 red, u8 green, u8 blue) |
| 50 | { |
| 51 | bt455_select_reg(regs, cr); |
| 52 | wmb(); |
| 53 | regs->addr_cmap_data = red & 0x0f; |
| 54 | wmb(); |
| 55 | regs->addr_cmap_data = green & 0x0f; |
| 56 | wmb(); |
| 57 | regs->addr_cmap_data = blue & 0x0f; |
| 58 | } |
| 59 | |
| 60 | static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr, |
| 61 | u8 red, u8 green, u8 blue) |
| 62 | { |
| 63 | bt455_select_reg(regs, cr); |
| 64 | wmb(); |
| 65 | regs->addr_ovly = red & 0x0f; |
| 66 | wmb(); |
| 67 | regs->addr_ovly = green & 0x0f; |
| 68 | wmb(); |
| 69 | regs->addr_ovly = blue & 0x0f; |
| 70 | } |
| 71 | |
| 72 | static inline void bt455_set_cursor(struct bt455_regs *regs) |
| 73 | { |
| 74 | mb(); |
| 75 | regs->addr_ovly = 0x0f; |
| 76 | wmb(); |
| 77 | regs->addr_ovly = 0x0f; |
| 78 | wmb(); |
| 79 | regs->addr_ovly = 0x0f; |
| 80 | } |
| 81 | |
| 82 | static inline void bt455_erase_cursor(struct bt455_regs *regs) |
| 83 | { |
| 84 | /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */ |
| 85 | /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */ |
| 86 | bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03); |
| 87 | bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07); |
| 88 | |
| 89 | wmb(); |
| 90 | regs->addr_ovly = 0x09; |
| 91 | wmb(); |
| 92 | regs->addr_ovly = 0x09; |
| 93 | wmb(); |
| 94 | regs->addr_ovly = 0x09; |
| 95 | } |