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