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