Linux Kernel  3.7.1
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mach64_cursor.c
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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 
9 #include <asm/io.h>
10 
11 #ifdef __sparc__
12 #include <asm/fbio.h>
13 #endif
14 
15 #include <video/mach64.h>
16 #include "atyfb.h"
17 
18 /*
19  * The hardware cursor definition requires 2 bits per pixel. The
20  * Cursor size reguardless of the visible cursor size is 64 pixels
21  * by 64 lines. The total memory required to define the cursor is
22  * 16 bytes / line for 64 lines or 1024 bytes of data. The data
23  * must be in a contigiuos format. The 2 bit cursor code values are
24  * as follows:
25  *
26  * 00 - pixel colour = CURSOR_CLR_0
27  * 01 - pixel colour = CURSOR_CLR_1
28  * 10 - pixel colour = transparent (current display pixel)
29  * 11 - pixel colour = 1's complement of current display pixel
30  *
31  * Cursor Offset 64 pixels Actual Displayed Area
32  * \_________________________/
33  * | | | |
34  * |<--------------->| | |
35  * | CURS_HORZ_OFFSET| | |
36  * | |_______| | 64 Lines
37  * | ^ | |
38  * | | | |
39  * | CURS_VERT_OFFSET| |
40  * | | | |
41  * |____________________|____| |
42  *
43  *
44  * The Screen position of the top left corner of the displayed
45  * cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
46  * when the cursor hot spot is not the top left corner and the
47  * physical cursor position becomes negative. It will be be displayed
48  * if either the horizontal or vertical cursor position is negative
49  *
50  * If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
51  * to a larger number and saturate CUR_HORZ_POSN to zero.
52  *
53  * if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
54  * CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor
55  * definitation and CUR_VERT_POSN must be saturated to zero.
56  */
57 
58  /*
59  * Hardware Cursor support.
60  */
61 static const u8 cursor_bits_lookup[16] = {
62  0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
63  0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
64 };
65 
66 static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
67 {
68  struct atyfb_par *par = (struct atyfb_par *) info->par;
69  u16 xoff, yoff;
70  int x, y, h;
71 
72 #ifdef __sparc__
73  if (par->mmaped)
74  return -EPERM;
75 #endif
76  if (par->asleep)
77  return -EPERM;
78 
79  wait_for_fifo(1, par);
80  if (cursor->enable)
82  | HWCURSOR_ENABLE, par);
83  else
85  & ~HWCURSOR_ENABLE, par);
86 
87  /* set position */
88  if (cursor->set & FB_CUR_SETPOS) {
89  x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
90  if (x < 0) {
91  xoff = -x;
92  x = 0;
93  } else {
94  xoff = 0;
95  }
96 
97  y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
98  if (y < 0) {
99  yoff = -y;
100  y = 0;
101  } else {
102  yoff = 0;
103  }
104 
105  h = cursor->image.height;
106 
107  /*
108  * In doublescan mode, the cursor location
109  * and heigh also needs to be doubled.
110  */
111  if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
112  y<<=1;
113  h<<=1;
114  }
115  wait_for_fifo(3, par);
116  aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
118  ((u32) (64 - h + yoff) << 16) | xoff, par);
119  aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
120  }
121 
122  /* Set color map */
123  if (cursor->set & FB_CUR_SETCMAP) {
124  u32 fg_idx, bg_idx, fg, bg;
125 
126  fg_idx = cursor->image.fg_color;
127  bg_idx = cursor->image.bg_color;
128 
129  fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
130  ((info->cmap.green[fg_idx] & 0xff) << 16) |
131  ((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
132 
133  bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
134  ((info->cmap.green[bg_idx] & 0xff) << 16) |
135  ((info->cmap.blue[bg_idx] & 0xff) << 8);
136 
137  wait_for_fifo(2, par);
138  aty_st_le32(CUR_CLR0, bg, par);
139  aty_st_le32(CUR_CLR1, fg, par);
140  }
141 
142  if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
143  u8 *src = (u8 *)cursor->image.data;
144  u8 *msk = (u8 *)cursor->mask;
145  u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
146  unsigned int width = (cursor->image.width + 7) >> 3;
147  unsigned int height = cursor->image.height;
148  unsigned int align = info->sprite.scan_align;
149 
150  unsigned int i, j, offset;
151  u8 m, b;
152 
153  // Clear cursor image with 1010101010...
154  fb_memset(dst, 0xaa, 1024);
155 
156  offset = align - width*2;
157 
158  for (i = 0; i < height; i++) {
159  for (j = 0; j < width; j++) {
160  b = *src++;
161  m = *msk++;
162  switch (cursor->rop) {
163  case ROP_XOR:
164  // Upper 4 bits of mask data
165  fb_writeb(cursor_bits_lookup[(b ^ m) >> 4], dst++);
166  // Lower 4 bits of mask
167  fb_writeb(cursor_bits_lookup[(b ^ m) & 0x0f],
168  dst++);
169  break;
170  case ROP_COPY:
171  // Upper 4 bits of mask data
172  fb_writeb(cursor_bits_lookup[(b & m) >> 4], dst++);
173  // Lower 4 bits of mask
174  fb_writeb(cursor_bits_lookup[(b & m) & 0x0f],
175  dst++);
176  break;
177  }
178  }
179  dst += offset;
180  }
181  }
182 
183  return 0;
184 }
185 
187 {
188  unsigned long addr;
189 
190  info->fix.smem_len -= PAGE_SIZE;
191 
192 #ifdef __sparc__
193  addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
194  info->sprite.addr = (u8 *) addr;
195 #else
196 #ifdef __BIG_ENDIAN
197  addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
198  info->sprite.addr = (u8 *) ioremap(addr, 1024);
199 #else
200  addr = (unsigned long) info->screen_base + info->fix.smem_len;
201  info->sprite.addr = (u8 *) addr;
202 #endif
203 #endif
204  if (!info->sprite.addr)
205  return -ENXIO;
206  info->sprite.size = PAGE_SIZE;
207  info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */
208  info->sprite.buf_align = 16; /* and 64 lines tall. */
209  info->sprite.flags = FB_PIXMAP_IO;
210 
211  info->fbops->fb_cursor = atyfb_cursor;
212 
213  return 0;
214 }
215