| 1 | |
| 2 | * linux/drivers/video/bt455.h
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| 3 | *
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| 4 | * Copyright 2003 Thiemo Seufer <[email protected]>
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| 5 | * Copyright 2016 Maciej W. Rozycki <[email protected]>
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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 | |
| 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 | |
| 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, 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, 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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