drivers/video/aty/mach64_cursor.c

   1 /*
   2  *  ATI Mach64 CT/VT/GT/LT Cursor Support
   3  */
   4
   5 #include <linux/fb.h>
   6 #include <linux/init.h>
   7 #include <linux/string.h>
   8
   9 #include <asm/io.h>
  10
  11 #ifdef __sparc__
  12 #include <asm/fbio.h>
  13 #endif
  14
  15 #include <video/mach64.h>
  16 #include "atyfb.h"
  17
  18 /*
  19  * The hardware cursor definition requires 2 bits per pixel. The
  20  * Cursor size reguardless of the visible cursor size is 64 pixels
  21  * by 64 lines. The total memory required to define the cursor is
  22  * 16 bytes / line for 64 lines or 1024 bytes of data. The data
  23  * must be in a contigiuos format. The 2 bit cursor code values are
  24  * as follows:
  25  *
  26  *      00 - pixel colour = CURSOR_CLR_0
  27  *      01 - pixel colour = CURSOR_CLR_1
  28  *      10 - pixel colour = transparent (current display pixel)
  29  *      11 - pixel colour = 1's complement of current display pixel
  30  *
  31  *      Cursor Offset        64 pixels           Actual Displayed Area
  32  *            \_________________________/
  33  *            |                 |       |       |
  34  *            |<--------------->|       |       |
  35  *            | CURS_HORZ_OFFSET|       |       |
  36  *            |                 |_______|       |  64 Lines
  37  *            |                    ^    |       |
  38  *            |                    |    |       |
  39  *            |         CURS_VERT_OFFSET|       |
  40  *            |                    |    |       |
  41  *            |____________________|____|       |
  42  *
  43  *
  44  * The Screen position of the top left corner of the displayed
  45  * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
  46  * when the cursor hot spot is not the top left corner and the
  47  * physical cursor position becomes negative. It will be be displayed
  48  * if either the horizontal or vertical cursor position is negative
  49  *
  50  * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
  51  * to a larger number and saturate CUR_HORZ_POSN to zero.
  52  *
  53  * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
  54  * CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor
  55  * definitation and CUR_VERT_POSN must be saturated to zero.
  56  */
  57
  58     /*
  59      *  Hardware Cursor support.
  60      */
  61 static const u8 cursor_bits_lookup[16] = {
  62         0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
  63         0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
  64 };
  65
  66 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
  67 {
  68         struct atyfb_par *par = (struct atyfb_par *) info->par;
  69         u16 xoff, yoff;
  70         int x, y, h;
  71
  72 #ifdef __sparc__
  73         if (par->mmaped)
  74                 return -EPERM;
  75 #endif
  76         if (par->asleep)
  77                 return -EPERM;
  78
  79         wait_for_fifo(1, par);
  80         if (cursor->enable)
  81                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
  82                             | HWCURSOR_ENABLE, par);
  83         else
  84                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
  85                                 & ~HWCURSOR_ENABLE, par);
  86
  87         /* set position */
  88         if (cursor->set & FB_CUR_SETPOS) {
  89                 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
  90                 if (x < 0) {
  91                         xoff = -x;
  92                         x = 0;
  93                 } else {
  94                         xoff = 0;
  95                 }
  96
  97                 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
  98                 if (y < 0) {
  99                         yoff = -y;
 100                         y = 0;
 101                 } else {
 102                         yoff = 0;
 103                 }
 104
 105                 h = cursor->image.height;
 106
 107                 /*
 108                  * In doublescan mode, the cursor location
 109                  * and heigh also needs to be doubled.
 110                  */
 111                 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
 112                         y<<=1;
 113                         h<<=1;
 114                 }
 115                 wait_for_fifo(3, par);
 116                 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
 117                 aty_st_le32(CUR_HORZ_VERT_OFF,
 118                             ((u32) (64 - h + yoff) << 16) | xoff, par);
 119                 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
 120         }
 121
 122         /* Set color map */
 123         if (cursor->set & FB_CUR_SETCMAP) {
 124                 u32 fg_idx, bg_idx, fg, bg;
 125
 126                 fg_idx = cursor->image.fg_color;
 127                 bg_idx = cursor->image.bg_color;
 128
 129                 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
 130                      ((info->cmap.green[fg_idx] & 0xff) << 16) |
 131                      ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
 132
 133                 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
 134                      ((info->cmap.green[bg_idx] & 0xff) << 16) |
 135                      ((info->cmap.blue[bg_idx] & 0xff) << 8);
 136
 137                 wait_for_fifo(2, par);
 138                 aty_st_le32(CUR_CLR0, bg, par);
 139                 aty_st_le32(CUR_CLR1, fg, par);
 140         }
 141
 142         if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
 143             u8 *src = (u8 *)cursor->image.data;
 144             u8 *msk = (u8 *)cursor->mask;
 145             u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
 146             unsigned int width = (cursor->image.width + 7) >> 3;
 147             unsigned int height = cursor->image.height;
 148             unsigned int align = info->sprite.scan_align;
 149
 150             unsigned int i, j, offset;
 151             u8 m, b;
 152
 153             // Clear cursor image with 1010101010...
 154             fb_memset(dst, 0xaa, 1024);
 155
 156             offset = align - width*2;
 157
 158             for (i = 0; i < height; i++) {
 159                 for (j = 0; j < width; j++) {
 160                         b = *src++;
 161                         m = *msk++;
 162                         switch (cursor->rop) {
 163                         case ROP_XOR:
 164                             // Upper 4 bits of mask data
 165                             fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++);
 166                             // Lower 4 bits of mask
 167                             fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f],
 168                                       dst++);
 169                             break;
 170                         case ROP_COPY:
 171                             // Upper 4 bits of mask data
 172                             fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++);
 173                             // Lower 4 bits of mask
 174                             fb_writeb(cursor_bits_lookup[(b & m) & 0x0f],
 175                                       dst++);
 176                             break;
 177                         }
 178                 }
 179                 dst += offset;
 180             }
 181         }
 182
 183         return 0;
 184 }
 185
 186 int aty_init_cursor(struct fb_info *info)
 187 {
 188         unsigned long addr;
 189
 190         info->fix.smem_len -= PAGE_SIZE;
 191
 192 #ifdef __sparc__
 193         addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
 194         info->sprite.addr = (u8 *) addr;
 195 #else
 196 #ifdef __BIG_ENDIAN
 197         addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
 198         info->sprite.addr = (u8 *) ioremap(addr, 1024);
 199 #else
 200         addr = (unsigned long) info->screen_base + info->fix.smem_len;
 201         info->sprite.addr = (u8 *) addr;
 202 #endif
 203 #endif
 204         if (!info->sprite.addr)
 205                 return -ENXIO;
 206         info->sprite.size = PAGE_SIZE;
 207         info->sprite.scan_align = 16;   /* Scratch pad 64 bytes wide */
 208         info->sprite.buf_align = 16;    /* and 64 lines tall. */
 209         info->sprite.flags = FB_PIXMAP_IO;
 210
 211         info->fbops->fb_cursor = atyfb_cursor;
 212
 213         return 0;
 214 }
 215