/* *	linux/drivers/video/bt455.h * *	Copyright 2003  Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> *	Copyright 2016  Maciej W. Rozycki <macro@linux-mips.org> * *	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;} static inline void bt455_reset_reg(struct bt455_regs *regs){	mb();	regs->addr_clr = 0;} /* * Read/write to a Bt455 color map register. */static inline void bt455_read_cmap_next(struct bt455_regs *regs, u8 *grey){	mb();	regs->addr_cmap_data;	rmb();	*grey = regs->addr_cmap_data & 0xf;	rmb();	regs->addr_cmap_data;} static inline void bt455_write_cmap_next(struct bt455_regs *regs, u8 grey){	wmb();	regs->addr_cmap_data = 0x0;	wmb();	regs->addr_cmap_data = grey & 0xf;	wmb();	regs->addr_cmap_data = 0x0;} static inline void bt455_write_ovly_next(struct bt455_regs *regs, u8 grey){	wmb();	regs->addr_ovly = 0x0;	wmb();	regs->addr_ovly = grey & 0xf;	wmb();	regs->addr_ovly = 0x0;} static inline void bt455_read_cmap_entry(struct bt455_regs *regs,					 int cr, u8 *grey){	bt455_select_reg(regs, cr);	bt455_read_cmap_next(regs, grey);} static inline void bt455_write_cmap_entry(struct bt455_regs *regs,					  int cr, u8 grey){	bt455_select_reg(regs, cr);	bt455_write_cmap_next(regs, grey);} static inline void bt455_write_ovly_entry(struct bt455_regs *regs, u8 grey){	bt455_reset_reg(regs);	bt455_write_ovly_next(regs, grey);}