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// SPDX-License-Identifier: GPL-2.0
/*
* ATI Mach64 CT/VT/GT/LT Cursor Support
*/
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/string.h>
#include "../core/fb_draw.h"
#include <asm/io.h>
#ifdef __sparc__
#include <asm/fbio.h>
#endif
#include <video/mach64.h>
#include "atyfb.h"
/*
* The hardware cursor definition requires 2 bits per pixel. The
* Cursor size reguardless of the visible cursor size is 64 pixels
* by 64 lines. The total memory required to define the cursor is
* 16 bytes / line for 64 lines or 1024 bytes of data. The data
* must be in a contigiuos format. The 2 bit cursor code values are
* as follows:
*
* 00 - pixel colour = CURSOR_CLR_0
* 01 - pixel colour = CURSOR_CLR_1
* 10 - pixel colour = transparent (current display pixel)
* 11 - pixel colour = 1's complement of current display pixel
*
* Cursor Offset 64 pixels Actual Displayed Area
* \_________________________/
* | | | |
* |<--------------->| | |
* | CURS_HORZ_OFFSET| | |
* | |_______| | 64 Lines
* | ^ | |
* | | | |
* | CURS_VERT_OFFSET| |
* | | | |
* |____________________|____| |
*
*
* The Screen position of the top left corner of the displayed
* cursor is specificed by CURS_HORZ_VERT_POSN. Care must be taken
* when the cursor hot spot is not the top left corner and the
* physical cursor position becomes negative. It will be be displayed
* if either the horizontal or vertical cursor position is negative
*
* If x becomes negative the cursor manager must adjust the CURS_HORZ_OFFSET
* to a larger number and saturate CUR_HORZ_POSN to zero.
*
* if Y becomes negative, CUR_VERT_OFFSET must be adjusted to a larger number,
* CUR_OFFSET must be adjusted to a point to the appropriate line in the cursor
* definitation and CUR_VERT_POSN must be saturated to zero.
*/
/*
* Hardware Cursor support.
*/
static const u8 cursor_bits_lookup[16] = {
0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
};
static int atyfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
struct atyfb_par *par = (struct atyfb_par *) info->par;
u16 xoff, yoff;
int x, y, h;
#ifdef __sparc__
if (par->mmaped)
return -EPERM;
#endif
if (par->asleep)
return -EPERM;
wait_for_fifo(1, par);
if (cursor->enable)
aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
| HWCURSOR_ENABLE, par);
else
aty_st_le32(GEN_TEST_CNTL, aty_ld_le32(GEN_TEST_CNTL, par)
& ~HWCURSOR_ENABLE, par);
/* set position */
if (cursor->set & FB_CUR_SETPOS) {
x = cursor->image.dx - cursor->hot.x - info->var.xoffset;
if (x < 0) {
xoff = -x;
x = 0;
} else {
xoff = 0;
}
y = cursor->image.dy - cursor->hot.y - info->var.yoffset;
if (y < 0) {
yoff = -y;
y = 0;
} else {
yoff = 0;
}
h = cursor->image.height;
/*
* In doublescan mode, the cursor location
* and heigh also needs to be doubled.
*/
if (par->crtc.gen_cntl & CRTC_DBL_SCAN_EN) {
y<<=1;
h<<=1;
}
wait_for_fifo(3, par);
aty_st_le32(CUR_OFFSET, (info->fix.smem_len >> 3) + (yoff << 1), par);
aty_st_le32(CUR_HORZ_VERT_OFF,
((u32) (64 - h + yoff) << 16) | xoff, par);
aty_st_le32(CUR_HORZ_VERT_POSN, ((u32) y << 16) | x, par);
}
/* Set color map */
if (cursor->set & FB_CUR_SETCMAP) {
u32 fg_idx, bg_idx, fg, bg;
fg_idx = cursor->image.fg_color;
bg_idx = cursor->image.bg_color;
fg = ((info->cmap.red[fg_idx] & 0xff) << 24) |
((info->cmap.green[fg_idx] & 0xff) << 16) |
((info->cmap.blue[fg_idx] & 0xff) << 8) | 0xff;
bg = ((info->cmap.red[bg_idx] & 0xff) << 24) |
((info->cmap.green[bg_idx] & 0xff) << 16) |
((info->cmap.blue[bg_idx] & 0xff) << 8);
wait_for_fifo(2, par);
aty_st_le32(CUR_CLR0, bg, par);
aty_st_le32(CUR_CLR1, fg, par);
}
if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
u8 *src = (u8 *)cursor->image.data;
u8 *msk = (u8 *)cursor->mask;
u8 __iomem *dst = (u8 __iomem *)info->sprite.addr;
unsigned int width = (cursor->image.width + 7) >> 3;
unsigned int height = cursor->image.height;
unsigned int align = info->sprite.scan_align;
unsigned int i, j, offset;
u8 m, b;
// Clear cursor image with 1010101010...
fb_memset(dst, 0xaa, 1024);
offset = align - width*2;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
u16 l = 0xaaaa;
b = *src++;
m = *msk++;
switch (cursor->rop) {
case ROP_XOR:
// Upper 4 bits of mask data
l = cursor_bits_lookup[(b ^ m) >> 4] |
// Lower 4 bits of mask
(cursor_bits_lookup[(b ^ m) & 0x0f] << 8);
break;
case ROP_COPY:
// Upper 4 bits of mask data
l = cursor_bits_lookup[(b & m) >> 4] |
// Lower 4 bits of mask
(cursor_bits_lookup[(b & m) & 0x0f] << 8);
break;
}
/*
* If cursor size is not a multiple of 8 characters
* we must pad it with transparent pattern (0xaaaa).
*/
if ((j + 1) * 8 > cursor->image.width) {
l = comp(l, 0xaaaa,
(1 << ((cursor->image.width & 7) * 2)) - 1);
}
fb_writeb(l & 0xff, dst++);
fb_writeb(l >> 8, dst++);
}
dst += offset;
}
}
return 0;
}
int aty_init_cursor(struct fb_info *info, struct fb_ops *atyfb_ops)
{
unsigned long addr;
info->fix.smem_len -= PAGE_SIZE;
#ifdef __sparc__
addr = (unsigned long) info->screen_base - 0x800000 + info->fix.smem_len;
info->sprite.addr = (u8 *) addr;
#else
#ifdef __BIG_ENDIAN
addr = info->fix.smem_start - 0x800000 + info->fix.smem_len;
info->sprite.addr = (u8 *) ioremap(addr, 1024);
#else
addr = (unsigned long) info->screen_base + info->fix.smem_len;
info->sprite.addr = (u8 *) addr;
#endif
#endif
if (!info->sprite.addr)
return -ENXIO;
info->sprite.size = PAGE_SIZE;
info->sprite.scan_align = 16; /* Scratch pad 64 bytes wide */
info->sprite.buf_align = 16; /* and 64 lines tall. */
info->sprite.flags = FB_PIXMAP_IO;
atyfb_ops->fb_cursor = atyfb_cursor;
return 0;
}
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