| /* |
| * 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); |
| } |