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 #include <asm/uaccess.h>
  12
  13 #ifdef __sparc__
  14 #include <asm/pbm.h>
  15 #include <asm/fbio.h>
  16 #endif
  17
  18 #include <video/mach64.h>
  19 #include "atyfb.h"
  20
  21 /*
  22  * The hardware cursor definition requires 2 bits per pixel. The
  23  * Cursor size reguardless of the visible cursor size is 64 pixels
  24  * by 64 lines. The total memory required to define the cursor is
  25  * 16 bytes / line for 64 lines or 1024 bytes of data. The data
  26  * must be in a contigiuos format. The 2 bit cursor code values are
  27  * as follows:
  28  *
  29  *      00 - pixel colour = CURSOR_CLR_0
  30  *      01 - pixel colour = CURSOR_CLR_1
  31  *      10 - pixel colour = transparent (current display pixel)
  32  *      11 - pixel colour = 1's complement of current display pixel
  33  *
  34  *      Cursor Offset        64 pixels           Actual Displayed Area
  35  *            \_________________________/
  36  *            |                 |       |       |
  37  *            |<--------------->|       |       |
  38  *            | CURS_HORZ_OFFSET|       |       |
  39  *            |                 |_______|       |  64 Lines
  40  *            |                    ^    |       |
  41  *            |                    |    |       |
  42  *            |         CURS_VERT_OFFSET|       |
  43  *            |                    |    |       |
  44  *            |____________________|____|       |
  45  *
  46  *
  47  * The Screen position of the top left corner of the displayed
  48  * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
  49  * when the cursor hot spot is not the top left corner and the
  50  * physical cursor position becomes negative. It will be be displayed
  51  * if either the horizontal or vertical cursor position is negative
  52  *
  53  * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
  54  * to a larger number and saturate CUR_HORZ_POSN to zero.
  55  *
  56  * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
  57  * CUR_OFFSET must be adjusted to a point to the appropraite line in the cursor
  58  * definitation and CUR_VERT_POSN must be saturated to zero.
  59  */
  60
  61     /*
  62      *  Hardware Cursor support.
  63      */
  64 static const u8 cursor_bits_lookup[16] = {
  65         0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
  66         0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
  67 };
  68
  69 static const u8 cursor_mask_lookup[16] = {
  70         0xaa, 0x2a, 0x8a, 0x0a, 0xa2, 0x22, 0x82, 0x02,
  71         0xa8, 0x28, 0x88, 0x08, 0xa0, 0x20, 0x80, 0x00
  72 };
  73
  74 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
  75 {
  76         struct atyfb_par *par = (struct atyfb_par *) info->par;
  77         u16 xoff, yoff;
  78         int x, y, h;
  79
  80 #ifdef __sparc__
  81         if (par->mmaped)
  82                 return -EPERM;
  83 #endif
  84         if (par->asleep)
  85                 return -EPERM;
  86
  87         /* Hide cursor */
  88         wait_for_fifo(1, par);
  89         aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) & ~HWCURSOR_ENABLE, par);
  90
  91         /* set position */
  92         if (cursor->set & FB_CUR_SETPOS) {
  93                 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
  94                 if (x < 0) {
  95                         xoff = -x;
  96                         x = 0;
  97                 } else {
  98                         xoff = 0;
  99                 }
 100
 101                 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
 102                 if (y < 0) {
 103                         yoff = -y;
 104                         y = 0;
 105                 } else {
 106                         yoff = 0;
 107                 }
 108
 109                 h = cursor->image.height;
 110
 111                 /*
 112                  * In doublescan mode, the cursor location
 113                  * and heigh also needs to be doubled.
 114                  */
 115                 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
 116                         y<<=1;
 117                         h<<=1;
 118                 }
 119                 wait_for_fifo(4, par);
 120                 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
 121                 aty_st_le32(CUR_HORZ_VERT_OFF,
 122                             ((u32) (64 - h + yoff) << 16) | xoff, par);
 123                 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
 124         }
 125
 126         /* Set color map */
 127         if (cursor->set & FB_CUR_SETCMAP) {
 128                 u32 fg_idx, bg_idx, fg, bg;
 129
 130                 fg_idx = cursor->image.fg_color;
 131                 bg_idx = cursor->image.bg_color;
 132
 133                 fg = (info->cmap.red[fg_idx] << 24) |
 134                      (info->cmap.green[fg_idx] << 16) |
 135                      (info->cmap.blue[fg_idx] << 8) | 15;
 136
 137                 bg = (info->cmap.red[bg_idx] << 24) |
 138                      (info->cmap.green[bg_idx] << 16) |
 139                      (info->cmap.blue[bg_idx] << 8);
 140
 141                 wait_for_fifo(2, par);
 142                 aty_st_le32(CUR_CLR0, bg, par);
 143                 aty_st_le32(CUR_CLR1, fg, par);
 144         }
 145
 146         if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
 147             u8 *src = (u8 *)cursor->image.data;
 148             u8 *msk = (u8 *)cursor->mask;
 149             u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
 150             unsigned int width = (cursor->image.width + 7) >> 3;
 151             unsigned int height = cursor->image.height;
 152             unsigned int align = info->sprite.scan_align;
 153
 154             unsigned int i, j, offset;
 155             u8 m, b;
 156
 157             // Clear cursor image with 1010101010...
 158             fb_memset(dst, 0xaa, 1024);
 159
 160             offset = align - width*2;
 161
 162             for (i = 0; i < height; i++) {
 163                 for (j = 0; j < width; j++) {
 164                         b = *src++;
 165                         m = *msk++;
 166                         switch (cursor->rop) {
 167                         case ROP_XOR:
 168                             // Upper 4 bits of mask data
 169                             fb_writeb(cursor_mask_lookup[m >> 4 ] |
 170                                 cursor_bits_lookup[(b ^ m) >> 4], dst++);
 171                             // Lower 4 bits of mask
 172                             fb_writeb(cursor_mask_lookup[m & 0x0f ] |
 173                                 cursor_bits_lookup[(b ^ m) & 0x0f], dst++);
 174                             break;
 175                         case ROP_COPY:
 176                             // Upper 4 bits of mask data
 177                             fb_writeb(cursor_mask_lookup[m >> 4 ] |
 178                                 cursor_bits_lookup[(b & m) >> 4], dst++);
 179                             // Lower 4 bits of mask
 180                             fb_writeb(cursor_mask_lookup[m & 0x0f ] |
 181                                 cursor_bits_lookup[(b & m) & 0x0f], dst++);
 182                             break;
 183                         }
 184                 }
 185                 dst += offset;
 186             }
 187         }
 188
 189         if (cursor->enable) {
 190                 wait_for_fifo(1, par);
 191                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
 192                             | HWCURSOR_ENABLE, par);
 193         }
 194         return 0;
 195 }
 196
 197 int __init aty_init_cursor(struct fb_info *info)
 198 {
 199         unsigned long addr;
 200
 201         info->fix.smem_len -= PAGE_SIZE;
 202
 203 #ifdef __sparc__
 204         addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
 205         info->sprite.addr = (u8 *) addr;
 206 #else
 207 #ifdef __BIG_ENDIAN
 208         addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
 209         info->sprite.addr = (u8 *) ioremap(addr, 1024);
 210 #else
 211         addr = (unsigned long) info->screen_base + info->fix.smem_len;
 212         info->sprite.addr = (u8 *) addr;
 213 #endif
 214 #endif
 215         if (!info->sprite.addr)
 216                 return -ENXIO;
 217         info->sprite.size = PAGE_SIZE;
 218         info->sprite.scan_align = 16;   /* Scratch pad 64 bytes wide */
 219         info->sprite.buf_align = 16;    /* and 64 lines tall. */
 220         info->sprite.flags = FB_PIXMAP_IO;
 221
 222         info->fbops->fb_cursor = atyfb_cursor;
 223
 224         return 0;
 225 }
 226