LXR linux/drivers/video/bt455.h

   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#include <asm/system.h>
  12
  13/*
  14 * Bt455 byte-wide registers, 32-bit aligned.
  15 */
  16struct bt455_regs {
  17        volatile u8 addr_cmap;
  18        u8 pad0[3];
  19        volatile u8 addr_cmap_data;
  20        u8 pad1[3];
  21        volatile u8 addr_clr;
  22        u8 pad2[3];
  23        volatile u8 addr_ovly;
  24        u8 pad3[3];
  25};
  26
  27static inline void bt455_select_reg(struct bt455_regs *regs, int ir)
  28{
  29        mb();
  30        regs->addr_cmap = ir & 0x0f;
  31}
  32
  33/*
  34 * Read/write to a Bt455 color map register.
  35 */
  36static inline void bt455_read_cmap_entry(struct bt455_regs *regs, int cr,
  37                                         u8* red, u8* green, u8* blue)
  38{
  39        bt455_select_reg(regs, cr);
  40        mb();
  41        *red = regs->addr_cmap_data & 0x0f;
  42        rmb();
  43        *green = regs->addr_cmap_data & 0x0f;
  44        rmb();
  45        *blue = regs->addr_cmap_data & 0x0f;
  46}
  47
  48static inline void bt455_write_cmap_entry(struct bt455_regs *regs, int cr,
  49                                          u8 red, u8 green, u8 blue)
  50{
  51        bt455_select_reg(regs, cr);
  52        wmb();
  53        regs->addr_cmap_data = red & 0x0f;
  54        wmb();
  55        regs->addr_cmap_data = green & 0x0f;
  56        wmb();
  57        regs->addr_cmap_data = blue & 0x0f;
  58}
  59
  60static inline void bt455_write_ovly_entry(struct bt455_regs *regs, int cr,
  61                                          u8 red, u8 green, u8 blue)
  62{
  63        bt455_select_reg(regs, cr);
  64        wmb();
  65        regs->addr_ovly = red & 0x0f;
  66        wmb();
  67        regs->addr_ovly = green & 0x0f;
  68        wmb();
  69        regs->addr_ovly = blue & 0x0f;
  70}
  71
  72static inline void bt455_set_cursor(struct bt455_regs *regs)
  73{
  74        mb();
  75        regs->addr_ovly = 0x0f;
  76        wmb();
  77        regs->addr_ovly = 0x0f;
  78        wmb();
  79        regs->addr_ovly = 0x0f;
  80}
  81
  82static inline void bt455_erase_cursor(struct bt455_regs *regs)
  83{
  84        /* bt455_write_cmap_entry(regs, 8, 0x00, 0x00, 0x00); */
  85        /* bt455_write_cmap_entry(regs, 9, 0x00, 0x00, 0x00); */
  86        bt455_write_ovly_entry(regs, 8, 0x03, 0x03, 0x03);
  87        bt455_write_ovly_entry(regs, 9, 0x07, 0x07, 0x07);
  88
  89        wmb();
  90        regs->addr_ovly = 0x09;
  91        wmb();
  92        regs->addr_ovly = 0x09;
  93        wmb();
  94        regs->addr_ovly = 0x09;
  95}
  96