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         /* Hide cursor */
  81         wait_for_fifo(1, par);
  82         aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) & ~HWCURSOR_ENABLE, par);
  83
  84         /* set position */
  85         if (cursor->set & FB_CUR_SETPOS) {
  86                 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
  87                 if (x < 0) {
  88                         xoff = -x;
  89                         x = 0;
  90                 } else {
  91                         xoff = 0;
  92                 }
  93
  94                 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
  95                 if (y < 0) {
  96                         yoff = -y;
  97                         y = 0;
  98                 } else {
  99                         yoff = 0;
 100                 }
 101
 102                 h = cursor->image.height;
 103
 104                 /*
 105                  * In doublescan mode, the cursor location
 106                  * and heigh also needs to be doubled.
 107                  */
 108                 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
 109                         y<<=1;
 110                         h<<=1;
 111                 }
 112                 wait_for_fifo(4, par);
 113                 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
 114                 aty_st_le32(CUR_HORZ_VERT_OFF,
 115                             ((u32) (64 - h + yoff) << 16) | xoff, par);
 116                 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
 117         }
 118
 119         /* Set color map */
 120         if (cursor->set & FB_CUR_SETCMAP) {
 121                 u32 fg_idx, bg_idx, fg, bg;
 122
 123                 fg_idx = cursor->image.fg_color;
 124                 bg_idx = cursor->image.bg_color;
 125
 126                 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
 127                      ((info->cmap.green[fg_idx] & 0xff) << 16) |
 128                      ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
 129
 130                 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
 131                      ((info->cmap.green[bg_idx] & 0xff) << 16) |
 132                      ((info->cmap.blue[bg_idx] & 0xff) << 8);
 133
 134                 wait_for_fifo(2, par);
 135                 aty_st_le32(CUR_CLR0, bg, par);
 136                 aty_st_le32(CUR_CLR1, fg, par);
 137         }
 138
 139         if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
 140             u8 *src = (u8 *)cursor->image.data;
 141             u8 *msk = (u8 *)cursor->mask;
 142             u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
 143             unsigned int width = (cursor->image.width + 7) >> 3;
 144             unsigned int height = cursor->image.height;
 145             unsigned int align = info->sprite.scan_align;
 146
 147             unsigned int i, j, offset;
 148             u8 m, b;
 149
 150             // Clear cursor image with 1010101010...
 151             fb_memset(dst, 0xaa, 1024);
 152
 153             offset = align - width*2;
 154
 155             for (i = 0; i < height; i++) {
 156                 for (j = 0; j < width; j++) {
 157                         b = *src++;
 158                         m = *msk++;
 159                         switch (cursor->rop) {
 160                         case ROP_XOR:
 161                             // Upper 4 bits of mask data
 162                             fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++);
 163                             // Lower 4 bits of mask
 164                             fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f],
 165                                       dst++);
 166                             break;
 167                         case ROP_COPY:
 168                             // Upper 4 bits of mask data
 169                             fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++);
 170                             // Lower 4 bits of mask
 171                             fb_writeb(cursor_bits_lookup[(b & m) & 0x0f],
 172                                       dst++);
 173                             break;
 174                         }
 175                 }
 176                 dst += offset;
 177             }
 178         }
 179
 180         if (cursor->enable) {
 181                 wait_for_fifo(1, par);
 182                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
 183                             | HWCURSOR_ENABLE, par);
 184         }
 185         return 0;
 186 }
 187
 188 int __devinit aty_init_cursor(struct fb_info *info)
 189 {
 190         unsigned long addr;
 191
 192         info->fix.smem_len -= PAGE_SIZE;
 193
 194 #ifdef __sparc__
 195         addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
 196         info->sprite.addr = (u8 *) addr;
 197 #else
 198 #ifdef __BIG_ENDIAN
 199         addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
 200         info->sprite.addr = (u8 *) ioremap(addr, 1024);
 201 #else
 202         addr = (unsigned long) info->screen_base + info->fix.smem_len;
 203         info->sprite.addr = (u8 *) addr;
 204 #endif
 205 #endif
 206         if (!info->sprite.addr)
 207                 return -ENXIO;
 208         info->sprite.size = PAGE_SIZE;
 209         info->sprite.scan_align = 16;   /* Scratch pad 64 bytes wide */
 210         info->sprite.buf_align = 16;    /* and 64 lines tall. */
 211         info->sprite.flags = FB_PIXMAP_IO;
 212
 213         info->fbops->fb_cursor = atyfb_cursor;
 214
 215         return 0;
 216 }
 217