drivers/video/fbdev/aty/mach64_cursor.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ATI Mach64 CT/VT/GT/LT Cursor Support
   4  */
   5
   6 #include <linux/fb.h>
   7 #include <linux/init.h>
   8 #include <linux/string.h>
   9 #include "../core/fb_draw.h"
  10
  11 #include <asm/io.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 appropriate 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         wait_for_fifo(1, par);
  82         if (cursor->enable)
  83                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
  84                             | HWCURSOR_ENABLE, par);
  85         else
  86                 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
  87                                 & ~HWCURSOR_ENABLE, par);
  88
  89         /* set position */
  90         if (cursor->set & FB_CUR_SETPOS) {
  91                 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
  92                 if (x < 0) {
  93                         xoff = -x;
  94                         x = 0;
  95                 } else {
  96                         xoff = 0;
  97                 }
  98
  99                 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
 100                 if (y < 0) {
 101                         yoff = -y;
 102                         y = 0;
 103                 } else {
 104                         yoff = 0;
 105                 }
 106
 107                 h = cursor->image.height;
 108
 109                 /*
 110                  * In doublescan mode, the cursor location
 111                  * and heigh also needs to be doubled.
 112                  */
 113                 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
 114                         y<<=1;
 115                         h<<=1;
 116                 }
 117                 wait_for_fifo(3, par);
 118                 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
 119                 aty_st_le32(CUR_HORZ_VERT_OFF,
 120                             ((u32) (64 - h + yoff) << 16) | xoff, par);
 121                 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
 122         }
 123
 124         /* Set color map */
 125         if (cursor->set & FB_CUR_SETCMAP) {
 126                 u32 fg_idx, bg_idx, fg, bg;
 127
 128                 fg_idx = cursor->image.fg_color;
 129                 bg_idx = cursor->image.bg_color;
 130
 131                 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
 132                      ((info->cmap.green[fg_idx] & 0xff) << 16) |
 133                      ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
 134
 135                 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
 136                      ((info->cmap.green[bg_idx] & 0xff) << 16) |
 137                      ((info->cmap.blue[bg_idx] & 0xff) << 8);
 138
 139                 wait_for_fifo(2, par);
 140                 aty_st_le32(CUR_CLR0, bg, par);
 141                 aty_st_le32(CUR_CLR1, fg, par);
 142         }
 143
 144         if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
 145             u8 *src = (u8 *)cursor->image.data;
 146             u8 *msk = (u8 *)cursor->mask;
 147             u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
 148             unsigned int width = (cursor->image.width + 7) >> 3;
 149             unsigned int height = cursor->image.height;
 150             unsigned int align = info->sprite.scan_align;
 151
 152             unsigned int i, j, offset;
 153             u8 m, b;
 154
 155             // Clear cursor image with 1010101010...
 156             fb_memset(dst, 0xaa, 1024);
 157
 158             offset = align - width*2;
 159
 160             for (i = 0; i < height; i++) {
 161                 for (j = 0; j < width; j++) {
 162                         u16 l = 0xaaaa;
 163                         b = *src++;
 164                         m = *msk++;
 165                         switch (cursor->rop) {
 166                         case ROP_XOR:
 167                             // Upper 4 bits of mask data
 168                             l = cursor_bits_lookup[(b ^ m) >> 4] |
 169                             // Lower 4 bits of mask
 170                                     (cursor_bits_lookup[(b ^ m) & 0x0f] << 8);
 171                             break;
 172                         case ROP_COPY:
 173                             // Upper 4 bits of mask data
 174                             l = cursor_bits_lookup[(b & m) >> 4] |
 175                             // Lower 4 bits of mask
 176                                     (cursor_bits_lookup[(b & m) & 0x0f] << 8);
 177                             break;
 178                         }
 179                         /*
 180                          * If cursor size is not a multiple of 8 characters
 181                          * we must pad it with transparent pattern (0xaaaa).
 182                          */
 183                         if ((j + 1) * 8 > cursor->image.width) {
 184                                 l = comp(l, 0xaaaa,
 185                                     (1 << ((cursor->image.width & 7) * 2)) - 1);
 186                         }
 187                         fb_writeb(l & 0xff, dst++);
 188                         fb_writeb(l >> 8, dst++);
 189                 }
 190                 dst += offset;
 191             }
 192         }
 193
 194         return 0;
 195 }
 196
 197 int 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