2 * ATI Mach64 CT/VT/GT/LT Cursor Support
5 #include <linux/slab.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
16 #include <video/mach64.h>
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
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
32 * Cursor Offset 64 pixels Actual Displayed Area
33 * \_________________________/
35 * |<--------------->| | |
36 * | CURS_HORZ_OFFSET| | |
37 * | |_______| | 64 Lines
40 * | CURS_VERT_OFFSET| |
42 * |____________________|____| |
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
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.
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 appropraite line in the cursor
56 * definitation and CUR_VERT_POSN must be saturated to zero.
60 * Hardware Cursor support.
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
67 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
69 struct atyfb_par *par = (struct atyfb_par *) info->par;
80 wait_for_fifo(1, par);
82 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
83 | HWCURSOR_ENABLE, par);
85 aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
86 & ~HWCURSOR_ENABLE, par);
89 if (cursor->set & FB_CUR_SETPOS) {
90 x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
98 y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
106 h = cursor->image.height;
109 * In doublescan mode, the cursor location
110 * and heigh also needs to be doubled.
112 if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
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);
124 if (cursor->set & FB_CUR_SETCMAP) {
125 u32 fg_idx, bg_idx, fg, bg;
127 fg_idx = cursor->image.fg_color;
128 bg_idx = cursor->image.bg_color;
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;
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);
138 wait_for_fifo(2, par);
139 aty_st_le32(CUR_CLR0, bg, par);
140 aty_st_le32(CUR_CLR1, fg, par);
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;
151 unsigned int i, j, offset;
154 // Clear cursor image with 1010101010...
155 fb_memset(dst, 0xaa, 1024);
157 offset = align - width*2;
159 for (i = 0; i < height; i++) {
160 for (j = 0; j < width; j++) {
163 switch (cursor->rop) {
165 // Upper 4 bits of mask data
166 fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++);
167 // Lower 4 bits of mask
168 fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f],
172 // Upper 4 bits of mask data
173 fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++);
174 // Lower 4 bits of mask
175 fb_writeb(cursor_bits_lookup[(b & m) & 0x0f],
187 int __devinit aty_init_cursor(struct fb_info *info)
191 info->fix.smem_len -= PAGE_SIZE;
194 addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
195 info->sprite.addr = (u8 *) addr;
198 addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
199 info->sprite.addr = (u8 *) ioremap(addr, 1024);
201 addr = (unsigned long) info->screen_base + info->fix.smem_len;
202 info->sprite.addr = (u8 *) addr;
205 if (!info->sprite.addr)
207 info->sprite.size = PAGE_SIZE;
208 info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */
209 info->sprite.buf_align = 16; /* and 64 lines tall. */
210 info->sprite.flags = FB_PIXMAP_IO;
212 info->fbops->fb_cursor = atyfb_cursor;