Blackfin: pull io funcs from linux

[u-boot] / lib_blackfin / outs.S

diff --git a/lib_blackfin/outs.S b/lib_blackfin/outs.S
new file mode 100644 (file)
index 0000000..90c6033
--- /dev/null
+++ b/lib_blackfin/outs.S
@@ -0,0 +1,60 @@
+/*
+ * Implementation of outs{bwl} for BlackFin processors using zero overhead loops.
+ *
+ * Copyright 2005-2009 Analog Devices Inc.
+ *                2005 BuyWays BV
+ *                      Bas Vermeulen <bas@buyways.nl>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <asm/linkage.h>
+
+.align 2
+
+ENTRY(_outsl)
+       P0 = R0;        /* P0 = port */
+       P1 = R1;        /* P1 = address */
+       P2 = R2;        /* P2 = count */
+
+       LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;
+.Llong_loop_s: R0 = [P1++];
+.Llong_loop_e: [P0] = R0;
+       RTS;
+ENDPROC(_outsl)
+
+ENTRY(_outsw)
+       P0 = R0;        /* P0 = port */
+       P1 = R1;        /* P1 = address */
+       P2 = R2;        /* P2 = count */
+
+       LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;
+.Lword_loop_s: R0 = W[P1++];
+.Lword_loop_e: W[P0] = R0;
+       RTS;
+ENDPROC(_outsw)
+
+ENTRY(_outsb)
+       P0 = R0;        /* P0 = port */
+       P1 = R1;        /* P1 = address */
+       P2 = R2;        /* P2 = count */
+
+       LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;
+.Lbyte_loop_s: R0 = B[P1++];
+.Lbyte_loop_e: B[P0] = R0;
+       RTS;
+ENDPROC(_outsb)
+
+ENTRY(_outsw_8)
+       P0 = R0;        /* P0 = port */
+       P1 = R1;        /* P1 = address */
+       P2 = R2;        /* P2 = count */
+
+       LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2;
+.Lword8_loop_s: R1 = B[P1++];
+               R0 = B[P1++];
+               R0 = R0 << 8;
+               R0 = R0 + R1;
+.Lword8_loop_e: W[P0] = R0;
+       RTS;
+ENDPROC(_outsw_8)