1 /* 2 * ATI Mach64 CT/VT/GT/LT Cursor Support 3 */ 4 5 #include <linux/fb.h> 6 #include <linux/init.h> 7 #include <linux/string.h> 8 #include "../core/fb_draw.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 appropriate 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 wait_for_fifo(1, par); 81 if (cursor->enable) 82 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) 83 | HWCURSOR_ENABLE, par); 84 else 85 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par) 86 & ~HWCURSOR_ENABLE, par); 87 88 /* set position */ 89 if (cursor->set & FB_CUR_SETPOS) { 90 x = cursor->image.dx - cursor->hot.x - info->var.xoffset; 91 if (x < 0) { 92 xoff = -x; 93 x = 0; 94 } else { 95 xoff = 0; 96 } 97 98 y = cursor->image.dy - cursor->hot.y - info->var.yoffset; 99 if (y < 0) { 100 yoff = -y; 101 y = 0; 102 } else { 103 yoff = 0; 104 } 105 106 h = cursor->image.height; 107 108 /* 109 * In doublescan mode, the cursor location 110 * and heigh also needs to be doubled. 111 */ 112 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) { 113 y<<=1; 114 h<<=1; 115 } 116 wait_for_fifo(3, par); 117 aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par); 118 aty_st_le32(CUR_HORZ_VERT_OFF, 119 ((u32) (64 - h + yoff) << 16) | xoff, par); 120 aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par); 121 } 122 123 /* Set color map */ 124 if (cursor->set & FB_CUR_SETCMAP) { 125 u32 fg_idx, bg_idx, fg, bg; 126 127 fg_idx = cursor->image.fg_color; 128 bg_idx = cursor->image.bg_color; 129 130 fg = ((info->cmap.red[fg_idx] & 0xff) << 24) | 131 ((info->cmap.green[fg_idx] & 0xff) << 16) | 132 ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff; 133 134 bg = ((info->cmap.red[bg_idx] & 0xff) << 24) | 135 ((info->cmap.green[bg_idx] & 0xff) << 16) | 136 ((info->cmap.blue[bg_idx] & 0xff) << 8); 137 138 wait_for_fifo(2, par); 139 aty_st_le32(CUR_CLR0, bg, par); 140 aty_st_le32(CUR_CLR1, fg, par); 141 } 142 143 if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) { 144 u8 *src = (u8 *)cursor->image.data; 145 u8 *msk = (u8 *)cursor->mask; 146 u8 __iomem *dst = (u8 __iomem *)info->sprite.addr; 147 unsigned int width = (cursor->image.width + 7) >> 3; 148 unsigned int height = cursor->image.height; 149 unsigned int align = info->sprite.scan_align; 150 151 unsigned int i, j, offset; 152 u8 m, b; 153 154 // Clear cursor image with 1010101010... 155 fb_memset(dst, 0xaa, 1024); 156 157 offset = align - width*2; 158 159 for (i = 0; i < height; i++) { 160 for (j = 0; j < width; j++) { 161 u16 l = 0xaaaa; 162 b = *src++; 163 m = *msk++; 164 switch (cursor->rop) { 165 case ROP_XOR: 166 // Upper 4 bits of mask data 167 l = cursor_bits_lookup[(b ^ m) >> 4] | 168 // Lower 4 bits of mask 169 (cursor_bits_lookup[(b ^ m) & 0x0f] << 8); 170 break; 171 case ROP_COPY: 172 // Upper 4 bits of mask data 173 l = cursor_bits_lookup[(b & m) >> 4] | 174 // Lower 4 bits of mask 175 (cursor_bits_lookup[(b & m) & 0x0f] << 8); 176 break; 177 } 178 /* 179 * If cursor size is not a multiple of 8 characters 180 * we must pad it with transparent pattern (0xaaaa). 181 */ 182 if ((j + 1) * 8 > cursor->image.width) { 183 l = comp(l, 0xaaaa, 184 (1 << ((cursor->image.width & 7) * 2)) - 1); 185 } 186 fb_writeb(l & 0xff, dst++); 187 fb_writeb(l >> 8, dst++); 188 } 189 dst += offset; 190 } 191 } 192 193 return 0; 194 } 195 196 int aty_init_cursor(struct fb_info *info) 197 { 198 unsigned long addr; 199 200 info->fix.smem_len -= PAGE_SIZE; 201 202 #ifdef __sparc__ 203 addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len; 204 info->sprite.addr = (u8 *) addr; 205 #else 206 #ifdef __BIG_ENDIAN 207 addr = info->fix.smem_start - 0x800000 + info->fix.smem_len; 208 info->sprite.addr = (u8 *) ioremap(addr, 1024); 209 #else 210 addr = (unsigned long) info->screen_base + info->fix.smem_len; 211 info->sprite.addr = (u8 *) addr; 212 #endif 213 #endif 214 if (!info->sprite.addr) 215 return -ENXIO; 216 info->sprite.size = PAGE_SIZE; 217 info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */ 218 info->sprite.buf_align = 16; /* and 64 lines tall. */ 219 info->sprite.flags = FB_PIXMAP_IO; 220 221 info->fbops->fb_cursor = atyfb_cursor; 222 223 return 0; 224 } 225 226