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 int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
  70 {
  71         struct atyfb_par *par = (struct atyfb_par *) info->par;
  72         u16 xoff, yoff;
  73         int x, y, h;
  74
  75 #ifdef __sparc__
  76         if (par->mmaped)
  77                 return -EPERM;
  78 #endif
  79         if (par->asleep)
  80                 return -EPERM;
  81
  82         /* Hide cursor */
  83         wait_for_fifo(1, par);
  84         aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) & ~HWCURSOR_ENABLE, par);
  85
  86         /* set position */
  87         if (cursor->set & FB_CUR_SETPOS) {
  88                 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
  89                 if (x < 0) {
  90                         xoff = -x;
  91                         x = 0;
  92                 } else {
  93                         xoff = 0;
  94                 }
  95
  96                 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
  97                 if (y < 0) {
  98                         yoff = -y;
  99                         y = 0;
 100                 } else {
 101                         yoff = 0;
 102                 }
 103
 104                 h = cursor->image.height;
 105
 106                 /*
 107                  * In doublescan mode, the cursor location
 108                  * and heigh also needs to be doubled.
 109                  */
 110                 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
 111                         y<<=1;
 112                         h<<=1;
 113                 }
 114                 wait_for_fifo(4, par);
 115                 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
 116                 aty_st_le32(CUR_HORZ_VERT_OFF,
 117                             ((u32) (64 - h + yoff) << 16) | xoff, par);
 118                 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
 119         }
 120
 121         /* Set color map */
 122         if (cursor->set & FB_CUR_SETCMAP) {
 123                 u32 fg_idx, bg_idx, fg, bg;
 124
 125                 fg_idx = cursor->image.fg_color;
 126                 bg_idx = cursor->image.bg_color;
 127
 128                 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
 129                      ((info->cmap.green[fg_idx] & 0xff) << 16) |
 130                      ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
 131
 132                 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
 133                      ((info->cmap.green[bg_idx] & 0xff) << 16) |
 134                      ((info->cmap.blue[bg_idx] & 0xff) << 8);
 135
 136                 wait_for_fifo(2, par);
 137                 aty_st_le32(CUR_CLR0, bg, par);
 138                 aty_st_le32(CUR_CLR1, fg, par);
 139         }
 140
 141         if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
 142             u8 *src = (u8 *)cursor->image.data;
 143             u8 *msk = (u8 *)cursor->mask;
 144             u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
 145             unsigned int width = (cursor->image.width + 7) >> 3;
 146             unsigned int height = cursor->image.height;
 147             unsigned int align = info->sprite.scan_align;
 148
 149             unsigned int i, j, offset;
 150             u8 m, b;
 151
 152             // Clear cursor image with 1010101010...
 153             fb_memset(dst, 0xaa, 1024);
 154
 155             offset = align - width*2;
 156
 157             for (i = 0; i < height; i++) {
 158                 for (j = 0; j < width; j++) {
 159                         b = *src++;
 160                         m = *msk++;
 161                         switch (cursor->rop) {
 162                         case ROP_XOR:
 163                             // Upper 4 bits of mask data
 164                             fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++);
 165                             // Lower 4 bits of mask
 166                             fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f],
 167                                       dst++);
 168                             break;
 169                         case ROP_COPY:
 170                             // Upper 4 bits of mask data
 171                             fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++);
 172                             // Lower 4 bits of mask
 173                             fb_writeb(cursor_bits_lookup[(b & m) & 0x0f],
 174                                       dst++);
 175                             break;
 176                         }
 177                 }
 178                 dst += offset;
 179             }
 180         }
 181
 182         if (cursor->enable) {
 183                 wait_for_fifo(1, par);
 184                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
 185                             | HWCURSOR_ENABLE, par);
 186         }
 187         return 0;
 188 }
 189
 190 int __devinit aty_init_cursor(struct fb_info *info)
 191 {
 192         unsigned long addr;
 193
 194         info->fix.smem_len -= PAGE_SIZE;
 195
 196 #ifdef __sparc__
 197         addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
 198         info->sprite.addr = (u8 *) addr;
 199 #else
 200 #ifdef __BIG_ENDIAN
 201         addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
 202         info->sprite.addr = (u8 *) ioremap(addr, 1024);
 203 #else
 204         addr = (unsigned long) info->screen_base + info->fix.smem_len;
 205         info->sprite.addr = (u8 *) addr;
 206 #endif
 207 #endif
 208         if (!info->sprite.addr)
 209                 return -ENXIO;
 210         info->sprite.size = PAGE_SIZE;
 211         info->sprite.scan_align = 16;   /* Scratch pad 64 bytes wide */
 212         info->sprite.buf_align = 16;    /* and 64 lines tall. */
 213         info->sprite.flags = FB_PIXMAP_IO;
 214
 215         info->fbops->fb_cursor = atyfb_cursor;
 216
 217         return 0;
 218 }
 219