1 files changed, 225 insertions, 0 deletions

diff --git a/drivers/video/fbdev/aty/mach64_cursor.c b/drivers/video/fbdev/aty/mach64_cursor.c
new file mode 100644
index 000000000000..2fa0317ab3c7
--- /dev/null
+++ b/drivers/video/fbdev/aty/mach64_cursor.c
@@ -0,0 +1,225 @@
+/*
+ *  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)
+{
+        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;
+
+        info->fbops->fb_cursor = atyfb_cursor;
+
+        return 0;
+}
+