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/* * linux/drivers/video/bt455.h * * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. */ #include <linux/types.h> /* * Bt455 byte-wide registers, 32-bit aligned. */ struct bt455_regs { volatile u8 addr_cmap; u8 pad0[3]; volatile u8 addr_cmap_data; u8 pad1[3]; volatile u8 addr_clr; u8 pad2[3]; volatile u8 addr_ovly; u8 pad3[3]; }; static inline void bt455_select_reg(struct bt455_regs *regs, int ir) { mb(); regs->addr_cmap = ir & 0x0f; } /* * Read/write to a Bt455 color map register. */ static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr, u8* red, u8* green, u8* blue) { bt455_select_reg(regs, cr); mb(); *red = regs->addr_cmap_data & 0x0f; rmb(); *green = regs->addr_cmap_data & 0x0f; rmb(); *blue = regs->addr_cmap_data & 0x0f; } static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr, u8 red, u8 green, u8 blue) { bt455_select_reg(regs, cr); wmb(); regs->addr_cmap_data = red & 0x0f; wmb(); regs->addr_cmap_data = green & 0x0f; wmb(); regs->addr_cmap_data = blue & 0x0f; } static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr, u8 red, u8 green, u8 blue) { bt455_select_reg(regs, cr); wmb(); regs->addr_ovly = red & 0x0f; wmb(); regs->addr_ovly = green & 0x0f; wmb(); regs->addr_ovly = blue & 0x0f; } static inline void bt455_set_cursor(struct bt455_regs *regs) { mb(); regs->addr_ovly = 0x0f; wmb(); regs->addr_ovly = 0x0f; wmb(); regs->addr_ovly = 0x0f; } static inline void bt455_erase_cursor(struct bt455_regs *regs) { /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */ /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */ bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03); bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07); wmb(); regs->addr_ovly = 0x09; wmb(); regs->addr_ovly = 0x09; wmb(); regs->addr_ovly = 0x09; } |