diff options
Diffstat (limited to 'drivers/video/fbdev/bt455.h')
| -rw-r--r-- | drivers/video/fbdev/bt455.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/video/fbdev/bt455.h b/drivers/video/fbdev/bt455.h new file mode 100644 index 000000000000..80f61b03e9ae --- /dev/null +++ b/drivers/video/fbdev/bt455.h @@ -0,0 +1,94 @@ +/* + * linux/drivers/video/bt455.h + * + * Copyright 2003 Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de> + * + * 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; +} + +/* + * Read/write to a Bt455 color map register. + */ +static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr, + u8* red, u8* green, u8* blue) +{ + bt455_select_reg(regs, cr); + mb(); + *red = regs->addr_cmap_data & 0x0f; + rmb(); + *green = regs->addr_cmap_data & 0x0f; + rmb(); + *blue = regs->addr_cmap_data & 0x0f; +} + +static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr, + u8 red, u8 green, u8 blue) +{ + bt455_select_reg(regs, cr); + wmb(); + regs->addr_cmap_data = red & 0x0f; + wmb(); + regs->addr_cmap_data = green & 0x0f; + wmb(); + regs->addr_cmap_data = blue & 0x0f; +} + +static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr, + u8 red, u8 green, u8 blue) +{ + bt455_select_reg(regs, cr); + wmb(); + regs->addr_ovly = red & 0x0f; + wmb(); + regs->addr_ovly = green & 0x0f; + wmb(); + regs->addr_ovly = blue & 0x0f; +} + +static inline void bt455_set_cursor(struct bt455_regs *regs) +{ + mb(); + regs->addr_ovly = 0x0f; + wmb(); + regs->addr_ovly = 0x0f; + wmb(); + regs->addr_ovly = 0x0f; +} + +static inline void bt455_erase_cursor(struct bt455_regs *regs) +{ + /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */ + /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */ + bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03); + bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07); + + wmb(); + regs->addr_ovly = 0x09; + wmb(); + regs->addr_ovly = 0x09; + wmb(); + regs->addr_ovly = 0x09; +} |