fbdev: add drawing functions for framebuffers in system RAM
The generic drawing functions (cfbimgblt, cfbcopyarea, cfbfillrect) assume
that the framebuffer is in IO memory. However, we have 3 drivers (hecubafb,
arcfb, and vfb) where the framebuffer is allocated from system RAM (via
vmalloc). Using _raw_read/write and family for these drivers (as used in
the cfb* functions) is illegal, especially in other platforms.
Create 3 new drawing functions, based almost entirely from the original
except that the framebuffer memory is assumed to be in system RAM.
These are named as sysimgblt, syscopyarea, and sysfillrect.
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/sysfillrect.c b/drivers/video/sysfillrect.c
new file mode 100644
index 0000000..10de707
--- /dev/null
+++ b/drivers/video/sysfillrect.c
@@ -0,0 +1,400 @@
+/*
+ * Generic fillrect for frame buffers in system RAM with packed pixels of
+ * any depth.
+ *
+ * Based almost entirely from cfbfillrect.c (which is based almost entirely
+ * on Geert Uytterhoeven's fillrect routine)
+ *
+ * Copyright (C) 2007 Antonino Daplas <adaplas@pol.net>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <asm/types.h>
+
+ /*
+ * Compose two values, using a bitmask as decision value
+ * This is equivalent to (a & mask) | (b & ~mask)
+ */
+
+static inline unsigned long
+comp(unsigned long a, unsigned long b, unsigned long mask)
+{
+ return ((a ^ b) & mask) ^ b;
+}
+
+ /*
+ * Create a pattern with the given pixel's color
+ */
+
+#if BITS_PER_LONG == 64
+static inline unsigned long
+pixel_to_pat( u32 bpp, u32 pixel)
+{
+ switch (bpp) {
+ case 1:
+ return 0xfffffffffffffffful*pixel;
+ case 2:
+ return 0x5555555555555555ul*pixel;
+ case 4:
+ return 0x1111111111111111ul*pixel;
+ case 8:
+ return 0x0101010101010101ul*pixel;
+ case 12:
+ return 0x0001001001001001ul*pixel;
+ case 16:
+ return 0x0001000100010001ul*pixel;
+ case 24:
+ return 0x0000000001000001ul*pixel;
+ case 32:
+ return 0x0000000100000001ul*pixel;
+ default:
+ panic("pixel_to_pat(): unsupported pixelformat\n");
+ }
+}
+#else
+static inline unsigned long
+pixel_to_pat( u32 bpp, u32 pixel)
+{
+ switch (bpp) {
+ case 1:
+ return 0xfffffffful*pixel;
+ case 2:
+ return 0x55555555ul*pixel;
+ case 4:
+ return 0x11111111ul*pixel;
+ case 8:
+ return 0x01010101ul*pixel;
+ case 12:
+ return 0x00001001ul*pixel;
+ case 16:
+ return 0x00010001ul*pixel;
+ case 24:
+ return 0x00000001ul*pixel;
+ case 32:
+ return 0x00000001ul*pixel;
+ default:
+ panic("pixel_to_pat(): unsupported pixelformat\n");
+ }
+}
+#endif
+
+ /*
+ * Aligned pattern fill using 32/64-bit memory accesses
+ */
+
+static void
+bitfill_aligned(unsigned long *dst, int dst_idx, unsigned long pat,
+ unsigned n, int bits)
+{
+ unsigned long first, last;
+
+ if (!n)
+ return;
+
+ first = FB_SHIFT_HIGH(~0UL, dst_idx);
+ last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
+
+ if (dst_idx+n <= bits) {
+ /* Single word */
+ if (last)
+ first &= last;
+ *dst = comp(pat, *dst, first);
+ } else {
+ /* Multiple destination words */
+
+ /* Leading bits */
+ if (first!= ~0UL) {
+ *dst = comp(pat, *dst, first);
+ dst++;
+ n -= bits - dst_idx;
+ }
+
+ /* Main chunk */
+ n /= bits;
+ while (n >= 8) {
+ *dst++ = pat;
+ *dst++ = pat;
+ *dst++ = pat;
+ *dst++ = pat;
+ *dst++ = pat;
+ *dst++ = pat;
+ *dst++ = pat;
+ *dst++ = pat;
+ n -= 8;
+ }
+ while (n--)
+ *dst++ = pat;
+ /* Trailing bits */
+ if (last)
+ *dst = comp(pat, *dst, last);
+ }
+}
+
+
+ /*
+ * Unaligned generic pattern fill using 32/64-bit memory accesses
+ * The pattern must have been expanded to a full 32/64-bit value
+ * Left/right are the appropriate shifts to convert to the pattern to be
+ * used for the next 32/64-bit word
+ */
+
+static void
+bitfill_unaligned(unsigned long *dst, int dst_idx, unsigned long pat,
+ int left, int right, unsigned n, int bits)
+{
+ unsigned long first, last;
+
+ if (!n)
+ return;
+
+ first = FB_SHIFT_HIGH(~0UL, dst_idx);
+ last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
+
+ if (dst_idx+n <= bits) {
+ /* Single word */
+ if (last)
+ first &= last;
+ *dst = comp(pat, *dst, first);
+ } else {
+ /* Multiple destination words */
+ /* Leading bits */
+ if (first) {
+ *dst = comp(pat, *dst, first);
+ dst++;
+ pat = pat << left | pat >> right;
+ n -= bits - dst_idx;
+ }
+
+ /* Main chunk */
+ n /= bits;
+ while (n >= 4) {
+ *dst++ = pat;
+ pat = pat << left | pat >> right;
+ *dst++ = pat;
+ pat = pat << left | pat >> right;
+ *dst++ = pat;
+ pat = pat << left | pat >> right;
+ *dst++ = pat;
+ pat = pat << left | pat >> right;
+ n -= 4;
+ }
+ while (n--) {
+ *dst++ = pat;
+ pat = pat << left | pat >> right;
+ }
+
+ /* Trailing bits */
+ if (last)
+ *dst = comp(pat, *dst, first);
+ }
+}
+
+ /*
+ * Aligned pattern invert using 32/64-bit memory accesses
+ */
+static void
+bitfill_aligned_rev(unsigned long *dst, int dst_idx, unsigned long pat,
+ unsigned n, int bits)
+{
+ unsigned long val = pat;
+ unsigned long first, last;
+
+ if (!n)
+ return;
+
+ first = FB_SHIFT_HIGH(~0UL, dst_idx);
+ last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
+
+ if (dst_idx+n <= bits) {
+ /* Single word */
+ if (last)
+ first &= last;
+ *dst = comp(*dst ^ val, *dst, first);
+ } else {
+ /* Multiple destination words */
+ /* Leading bits */
+ if (first!=0UL) {
+ *dst = comp(*dst ^ val, *dst, first);
+ dst++;
+ n -= bits - dst_idx;
+ }
+
+ /* Main chunk */
+ n /= bits;
+ while (n >= 8) {
+ *dst++ ^= val;
+ *dst++ ^= val;
+ *dst++ ^= val;
+ *dst++ ^= val;
+ *dst++ ^= val;
+ *dst++ ^= val;
+ *dst++ ^= val;
+ *dst++ ^= val;
+ n -= 8;
+ }
+ while (n--)
+ *dst++ ^= val;
+ /* Trailing bits */
+ if (last)
+ *dst = comp(*dst ^ val, *dst, last);
+ }
+}
+
+
+ /*
+ * Unaligned generic pattern invert using 32/64-bit memory accesses
+ * The pattern must have been expanded to a full 32/64-bit value
+ * Left/right are the appropriate shifts to convert to the pattern to be
+ * used for the next 32/64-bit word
+ */
+
+static void
+bitfill_unaligned_rev(unsigned long *dst, int dst_idx, unsigned long pat,
+ int left, int right, unsigned n, int bits)
+{
+ unsigned long first, last;
+
+ if (!n)
+ return;
+
+ first = FB_SHIFT_HIGH(~0UL, dst_idx);
+ last = ~(FB_SHIFT_HIGH(~0UL, (dst_idx+n) % bits));
+
+ if (dst_idx+n <= bits) {
+ /* Single word */
+ if (last)
+ first &= last;
+ *dst = comp(*dst ^ pat, *dst, first);
+ } else {
+ /* Multiple destination words */
+
+ /* Leading bits */
+ if (first != 0UL) {
+ *dst = comp(*dst ^ pat, *dst, first);
+ dst++;
+ pat = pat << left | pat >> right;
+ n -= bits - dst_idx;
+ }
+
+ /* Main chunk */
+ n /= bits;
+ while (n >= 4) {
+ *dst++ ^= pat;
+ pat = pat << left | pat >> right;
+ *dst++ ^= pat;
+ pat = pat << left | pat >> right;
+ *dst++ ^= pat;
+ pat = pat << left | pat >> right;
+ *dst++ ^= pat;
+ pat = pat << left | pat >> right;
+ n -= 4;
+ }
+ while (n--) {
+ *dst ^= pat;
+ pat = pat << left | pat >> right;
+ }
+
+ /* Trailing bits */
+ if (last)
+ *dst = comp(*dst ^ pat, *dst, last);
+ }
+}
+
+void sys_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
+{
+ unsigned long pat, fg;
+ unsigned long width = rect->width, height = rect->height;
+ int bits = BITS_PER_LONG, bytes = bits >> 3;
+ u32 bpp = p->var.bits_per_pixel;
+ unsigned long *dst;
+ int dst_idx, left;
+
+ if (p->state != FBINFO_STATE_RUNNING)
+ return;
+
+ if (p->fix.visual == FB_VISUAL_TRUECOLOR ||
+ p->fix.visual == FB_VISUAL_DIRECTCOLOR )
+ fg = ((u32 *) (p->pseudo_palette))[rect->color];
+ else
+ fg = rect->color;
+
+ pat = pixel_to_pat( bpp, fg);
+
+ dst = (unsigned long *)((unsigned long)p->screen_base & ~(bytes-1));
+ dst_idx = ((unsigned long)p->screen_base & (bytes - 1))*8;
+ dst_idx += rect->dy*p->fix.line_length*8+rect->dx*bpp;
+ /* FIXME For now we support 1-32 bpp only */
+ left = bits % bpp;
+ if (p->fbops->fb_sync)
+ p->fbops->fb_sync(p);
+ if (!left) {
+ void (*fill_op32)(unsigned long *dst, int dst_idx,
+ unsigned long pat, unsigned n, int bits) =
+ NULL;
+
+ switch (rect->rop) {
+ case ROP_XOR:
+ fill_op32 = bitfill_aligned_rev;
+ break;
+ case ROP_COPY:
+ fill_op32 = bitfill_aligned;
+ break;
+ default:
+ printk( KERN_ERR "cfb_fillrect(): unknown rop, "
+ "defaulting to ROP_COPY\n");
+ fill_op32 = bitfill_aligned;
+ break;
+ }
+ while (height--) {
+ dst += dst_idx >> (ffs(bits) - 1);
+ dst_idx &= (bits - 1);
+ fill_op32(dst, dst_idx, pat, width*bpp, bits);
+ dst_idx += p->fix.line_length*8;
+ }
+ } else {
+ int right;
+ int r;
+ int rot = (left-dst_idx) % bpp;
+ void (*fill_op)(unsigned long *dst, int dst_idx,
+ unsigned long pat, int left, int right,
+ unsigned n, int bits) = NULL;
+
+ /* rotate pattern to correct start position */
+ pat = pat << rot | pat >> (bpp-rot);
+
+ right = bpp-left;
+ switch (rect->rop) {
+ case ROP_XOR:
+ fill_op = bitfill_unaligned_rev;
+ break;
+ case ROP_COPY:
+ fill_op = bitfill_unaligned;
+ break;
+ default:
+ printk(KERN_ERR "cfb_fillrect(): unknown rop, "
+ "defaulting to ROP_COPY\n");
+ fill_op = bitfill_unaligned;
+ break;
+ }
+ while (height--) {
+ dst += dst_idx >> (ffs(bits) - 1);
+ dst_idx &= (bits - 1);
+ fill_op(dst, dst_idx, pat, left, right,
+ width*bpp, bits);
+ r = (p->fix.line_length*8) % bpp;
+ pat = pat << (bpp-r) | pat >> r;
+ dst_idx += p->fix.line_length*8;
+ }
+ }
+}
+
+EXPORT_SYMBOL(sys_fillrect);
+
+MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
+MODULE_DESCRIPTION("Generic fill rectangle (sys-to-sys)");
+MODULE_LICENSE("GPL");