drivers/video/aty/mach64_cursor.c

   1 /*
   2  *  ATI Mach64 CT/VT/GT/LT Cursor Support
   3  */
   4
   5 #include <linux/slab.h>
   6 #include <linux/fb.h>
   7 #include <linux/init.h>
   8 #include <linux/string.h>
   9
  10 #include <asm/io.h>
  11
  12 #ifdef __sparc__
  13 #include <asm/fbio.h>
  14 #endif
  15
  16 #include <video/mach64.h>
  17 #include "atyfb.h"
  18
  19 /*
  20  * The hardware cursor definition requires 2 bits per pixel. The
  21  * Cursor size reguardless of the visible cursor size is 64 pixels
  22  * by 64 lines. The total memory required to define the cursor is
  23  * 16 bytes / line for 64 lines or 1024 bytes of data. The data
  24  * must be in a contigiuos format. The 2 bit cursor code values are
  25  * as follows:
  26  *
  27  *      00 - pixel colour = CURSOR_CLR_0
  28  *      01 - pixel colour = CURSOR_CLR_1
  29  *      10 - pixel colour = transparent (current display pixel)
  30  *      11 - pixel colour = 1's complement of current display pixel
  31  *
  32  *      Cursor Offset        64 pixels           Actual Displayed Area
  33  *            \_________________________/
  34  *            |                 |       |       |
  35  *            |<--------------->|       |       |
  36  *            | CURS_HORZ_OFFSET|       |       |
  37  *            |                 |_______|       |  64 Lines
  38  *            |                    ^    |       |
  39  *            |                    |    |       |
  40  *            |         CURS_VERT_OFFSET|       |
  41  *            |                    |    |       |
  42  *            |____________________|____|       |
  43  *
  44  *
  45  * The Screen position of the top left corner of the displayed
  46  * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
  47  * when the cursor hot spot is not the top left corner and the
  48  * physical cursor position becomes negative. It will be be displayed
  49  * if either the horizontal or vertical cursor position is negative
  50  *
  51  * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
  52  * to a larger number and saturate CUR_HORZ_POSN to zero.
  53  *
  54  * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
  55  * CUR_OFFSET must be adjusted to a point to the appropraite line in the cursor
  56  * definitation and CUR_VERT_POSN must be saturated to zero.
  57  */
  58
  59     /*
  60      *  Hardware Cursor support.
  61      */
  62 static const u8 cursor_bits_lookup[16] = {
  63         0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
  64         0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
  65 };
  66
  67 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
  68 {
  69         struct atyfb_par *par = (struct atyfb_par *) info->par;
  70         u16 xoff, yoff;
  71         int x, y, h;
  72
  73 #ifdef __sparc__
  74         if (par->mmaped)
  75                 return -EPERM;
  76 #endif
  77         if (par->asleep)
  78                 return -EPERM;
  79
  80         wait_for_fifo(1, par);
  81         if (cursor->enable)
  82                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
  83                             | HWCURSOR_ENABLE, par);
  84         else
  85                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
  86                                 & ~HWCURSOR_ENABLE, par);
  87
  88         /* set position */
  89         if (cursor->set & FB_CUR_SETPOS) {
  90                 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
  91                 if (x < 0) {
  92                         xoff = -x;
  93                         x = 0;
  94                 } else {
  95                         xoff = 0;
  96                 }
  97
  98                 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
  99                 if (y < 0) {
 100                         yoff = -y;
 101                         y = 0;
 102                 } else {
 103                         yoff = 0;
 104                 }
 105
 106                 h = cursor->image.height;
 107
 108                 /*
 109                  * In doublescan mode, the cursor location
 110                  * and heigh also needs to be doubled.
 111                  */
 112                 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
 113                         y<<=1;
 114                         h<<=1;
 115                 }
 116                 wait_for_fifo(3, par);
 117                 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
 118                 aty_st_le32(CUR_HORZ_VERT_OFF,
 119                             ((u32) (64 - h + yoff) << 16) | xoff, par);
 120                 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
 121         }
 122
 123         /* Set color map */
 124         if (cursor->set & FB_CUR_SETCMAP) {
 125                 u32 fg_idx, bg_idx, fg, bg;
 126
 127                 fg_idx = cursor->image.fg_color;
 128                 bg_idx = cursor->image.bg_color;
 129
 130                 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
 131                      ((info->cmap.green[fg_idx] & 0xff) << 16) |
 132                      ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
 133
 134                 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
 135                      ((info->cmap.green[bg_idx] & 0xff) << 16) |
 136                      ((info->cmap.blue[bg_idx] & 0xff) << 8);
 137
 138                 wait_for_fifo(2, par);
 139                 aty_st_le32(CUR_CLR0, bg, par);
 140                 aty_st_le32(CUR_CLR1, fg, par);
 141         }
 142
 143         if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
 144             u8 *src = (u8 *)cursor->image.data;
 145             u8 *msk = (u8 *)cursor->mask;
 146             u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
 147             unsigned int width = (cursor->image.width + 7) >> 3;
 148             unsigned int height = cursor->image.height;
 149             unsigned int align = info->sprite.scan_align;
 150
 151             unsigned int i, j, offset;
 152             u8 m, b;
 153
 154             // Clear cursor image with 1010101010...
 155             fb_memset(dst, 0xaa, 1024);
 156
 157             offset = align - width*2;
 158
 159             for (i = 0; i < height; i++) {
 160                 for (j = 0; j < width; j++) {
 161                         b = *src++;
 162                         m = *msk++;
 163                         switch (cursor->rop) {
 164                         case ROP_XOR:
 165                             // Upper 4 bits of mask data
 166                             fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++);
 167                             // Lower 4 bits of mask
 168                             fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f],
 169                                       dst++);
 170                             break;
 171                         case ROP_COPY:
 172                             // Upper 4 bits of mask data
 173                             fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++);
 174                             // Lower 4 bits of mask
 175                             fb_writeb(cursor_bits_lookup[(b & m) & 0x0f],
 176                                       dst++);
 177                             break;
 178                         }
 179                 }
 180                 dst += offset;
 181             }
 182         }
 183
 184         return 0;
 185 }
 186
 187 int __devinit aty_init_cursor(struct fb_info *info)
 188 {
 189         unsigned long addr;
 190
 191         info->fix.smem_len -= PAGE_SIZE;
 192
 193 #ifdef __sparc__
 194         addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
 195         info->sprite.addr = (u8 *) addr;
 196 #else
 197 #ifdef __BIG_ENDIAN
 198         addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
 199         info->sprite.addr = (u8 *) ioremap(addr, 1024);
 200 #else
 201         addr = (unsigned long) info->screen_base + info->fix.smem_len;
 202         info->sprite.addr = (u8 *) addr;
 203 #endif
 204 #endif
 205         if (!info->sprite.addr)
 206                 return -ENXIO;
 207         info->sprite.size = PAGE_SIZE;
 208         info->sprite.scan_align = 16;   /* Scratch pad 64 bytes wide */
 209         info->sprite.buf_align = 16;    /* and 64 lines tall. */
 210         info->sprite.flags = FB_PIXMAP_IO;
 211
 212         info->fbops->fb_cursor = atyfb_cursor;
 213
 214         return 0;
 215 }
 216