linux/drivers/video/bt455.h
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   1/*
   2 *      linux/drivers/video/bt455.h
   3 *
   4 *      Copyright 2003  Thiemo Seufer <seufer@csv.ica.uni-stuttgart.de>
   5 *
   6 *      This file is subject to the terms and conditions of the GNU General
   7 *      Public License. See the file COPYING in the main directory of this
   8 *      archive for more details.
   9 */
  10#include <linux/types.h>
  11
  12/*
  13 * Bt455 byte-wide registers, 32-bit aligned.
  14 */
  15struct bt455_regs {
  16        volatile u8 addr_cmap;
  17        u8 pad0[3];
  18        volatile u8 addr_cmap_data;
  19        u8 pad1[3];
  20        volatile u8 addr_clr;
  21        u8 pad2[3];
  22        volatile u8 addr_ovly;
  23        u8 pad3[3];
  24};
  25
  26static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
  27{
  28        mb();
  29        regs->addr_cmap = ir & 0x0f;
  30}
  31
  32/*
  33 * Read/write to a Bt455 color map register.
  34 */
  35static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr,
  36                                         u8* red, u8* green, u8* blue)
  37{
  38        bt455_select_reg(regs, cr);
  39        mb();
  40        *red = regs->addr_cmap_data & 0x0f;
  41        rmb();
  42        *green = regs->addr_cmap_data & 0x0f;
  43        rmb();
  44        *blue = regs->addr_cmap_data & 0x0f;
  45}
  46
  47static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr,
  48                                          u8 red, u8 green, u8 blue)
  49{
  50        bt455_select_reg(regs, cr);
  51        wmb();
  52        regs->addr_cmap_data = red & 0x0f;
  53        wmb();
  54        regs->addr_cmap_data = green & 0x0f;
  55        wmb();
  56        regs->addr_cmap_data = blue & 0x0f;
  57}
  58
  59static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr,
  60                                          u8 red, u8 green, u8 blue)
  61{
  62        bt455_select_reg(regs, cr);
  63        wmb();
  64        regs->addr_ovly = red & 0x0f;
  65        wmb();
  66        regs->addr_ovly = green & 0x0f;
  67        wmb();
  68        regs->addr_ovly = blue & 0x0f;
  69}
  70
  71static inline void bt455_set_cursor(struct bt455_regs *regs)
  72{
  73        mb();
  74        regs->addr_ovly = 0x0f;
  75        wmb();
  76        regs->addr_ovly = 0x0f;
  77        wmb();
  78        regs->addr_ovly = 0x0f;
  79}
  80
  81static inline void bt455_erase_cursor(struct bt455_regs *regs)
  82{
  83        /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */
  84        /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */
  85        bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03);
  86        bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07);
  87
  88        wmb();
  89        regs->addr_ovly = 0x09;
  90        wmb();
  91        regs->addr_ovly = 0x09;
  92        wmb();
  93        regs->addr_ovly = 0x09;
  94}
  95
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