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 */ 16struct 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 27static 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 */ 36static 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 48static 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 60static 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 72static 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 82static 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} 96