| 1 | /* |
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| 2 | * linux/drivers/video/bt455.h |
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| 3 | * |
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| 4 | * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> |
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| 5 | * Copyright 2016 Maciej W. Rozycki <macro@linux-mips.org> |
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| 6 | * |
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| 7 | * This file is subject to the terms and conditions of the GNU General |
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| 8 | * Public License. See the file COPYING in the main directory of this |
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| 9 | * archive for more details. |
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| 10 | */ |
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| 11 | #include <linux/types.h> |
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| 12 | |
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| 13 | /* |
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| 14 | * Bt455 byte-wide registers, 32-bit aligned. |
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| 15 | */ |
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| 16 | struct bt455_regs { |
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| 17 | volatile u8 addr_cmap; |
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| 18 | u8 pad0[3]; |
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| 19 | volatile u8 addr_cmap_data; |
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| 20 | u8 pad1[3]; |
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| 21 | volatile u8 addr_clr; |
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| 22 | u8 pad2[3]; |
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| 23 | volatile u8 addr_ovly; |
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| 24 | u8 pad3[3]; |
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| 25 | }; |
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| 26 | |
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| 27 | static inline void bt455_select_reg(struct bt455_regs *regs, int ir) |
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| 28 | { |
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| 29 | mb(); |
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| 30 | regs->addr_cmap = ir & 0x0f; |
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| 31 | } |
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| 32 | |
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| 33 | static inline void bt455_reset_reg(struct bt455_regs *regs) |
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| 34 | { |
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| 35 | mb(); |
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| 36 | regs->addr_clr = 0; |
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| 37 | } |
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| 38 | |
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| 39 | /* |
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| 40 | * Read/write to a Bt455 color map register. |
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| 41 | */ |
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| 42 | static inline void bt455_read_cmap_next(struct bt455_regs *regs, u8 *grey) |
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| 43 | { |
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| 44 | mb(); |
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| 45 | regs->addr_cmap_data; |
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| 46 | rmb(); |
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| 47 | *grey = regs->addr_cmap_data & 0xf; |
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| 48 | rmb(); |
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| 49 | regs->addr_cmap_data; |
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| 50 | } |
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| 51 | |
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| 52 | static inline void bt455_write_cmap_next(struct bt455_regs *regs, u8 grey) |
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| 53 | { |
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| 54 | wmb(); |
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| 55 | regs->addr_cmap_data = 0x0; |
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| 56 | wmb(); |
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| 57 | regs->addr_cmap_data = grey & 0xf; |
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| 58 | wmb(); |
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| 59 | regs->addr_cmap_data = 0x0; |
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| 60 | } |
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| 61 | |
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| 62 | static inline void bt455_write_ovly_next(struct bt455_regs *regs, u8 grey) |
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| 63 | { |
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| 64 | wmb(); |
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| 65 | regs->addr_ovly = 0x0; |
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| 66 | wmb(); |
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| 67 | regs->addr_ovly = grey & 0xf; |
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| 68 | wmb(); |
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| 69 | regs->addr_ovly = 0x0; |
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| 70 | } |
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| 71 | |
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| 72 | static inline void bt455_read_cmap_entry(struct bt455_regs *regs, |
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| 73 | int cr, u8 *grey) |
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| 74 | { |
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| 75 | bt455_select_reg(regs, ir: cr); |
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| 76 | bt455_read_cmap_next(regs, grey); |
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| 77 | } |
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| 78 | |
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| 79 | static inline void bt455_write_cmap_entry(struct bt455_regs *regs, |
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| 80 | int cr, u8 grey) |
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| 81 | { |
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| 82 | bt455_select_reg(regs, ir: cr); |
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| 83 | bt455_write_cmap_next(regs, grey); |
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| 84 | } |
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| 85 | |
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| 86 | static inline void bt455_write_ovly_entry(struct bt455_regs *regs, u8 grey) |
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| 87 | { |
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| 88 | bt455_reset_reg(regs); |
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| 89 | bt455_write_ovly_next(regs, grey); |
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| 90 | } |
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| 91 | |
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