From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 12:05:51 +0200
Subject: Adding upstream version 5.10.209.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/video/fbdev/aty/mach64_cursor.c | 226 ++++++++++++++++++++++++++++++++
 1 file changed, 226 insertions(+)
 create mode 100644 drivers/video/fbdev/aty/mach64_cursor.c

(limited to 'drivers/video/fbdev/aty/mach64_cursor.c')

diff --git a/drivers/video/fbdev/aty/mach64_cursor.c b/drivers/video/fbdev/aty/mach64_cursor.c
new file mode 100644
index 000000000..b06fa6e42
--- /dev/null
+++ b/drivers/video/fbdev/aty/mach64_cursor.c
@@ -0,0 +1,226 @@
+// 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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