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