C6X: headers

Original port to early 2.6 kernel using TI COFF toolchain.
Brought up to date by Mark Salter <msalter@redhat.com>

Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 67 insertions, 0 deletions

diff --git a/arch/c6x/include/asm/delay.h b/arch/c6x/include/asm/delay.h
new file mode 100644
index 00000000000..f314c2e9eb5
--- /dev/null
+++ b/arch/c6x/include/asm/delay.h
@@ -0,0 +1,67 @@
+/*
+ *  Port on Texas Instruments TMS320C6x architecture
+ *
+ *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
+ *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+#ifndef _ASM_C6X_DELAY_H
+#define _ASM_C6X_DELAY_H
+
+#include <linux/kernel.h>
+
+extern unsigned int ticks_per_ns_scaled;
+
+static inline void __delay(unsigned long loops)
+{
+	uint32_t tmp;
+
+	/* 6 cycles per loop */
+	asm volatile ("        mv    .s1  %0,%1\n"
+		      "0: [%1] b     .s1  0b\n"
+		      "        add   .l1  -6,%0,%0\n"
+		      "        cmplt .l1  1,%0,%1\n"
+		      "        nop   3\n"
+		      : "+a"(loops), "=A"(tmp));
+}
+
+static inline void _c6x_tickdelay(unsigned int x)
+{
+	uint32_t cnt, endcnt;
+
+	asm volatile ("        mvc   .s2   TSCL,%0\n"
+		      "        add   .s2x  %0,%1,%2\n"
+		      " ||     mvk   .l2   1,B0\n"
+		      "0: [B0] b     .s2   0b\n"
+		      "        mvc   .s2   TSCL,%0\n"
+		      "        sub   .s2   %0,%2,%0\n"
+		      "        cmpgt .l2   0,%0,B0\n"
+		      "        nop   2\n"
+		      : "=b"(cnt), "+a"(x), "=b"(endcnt) : : "B0");
+}
+
+/* use scaled math to avoid slow division */
+#define C6X_NDELAY_SCALE 10
+
+static inline void _ndelay(unsigned int n)
+{
+	_c6x_tickdelay((ticks_per_ns_scaled * n) >> C6X_NDELAY_SCALE);
+}
+
+static inline void _udelay(unsigned int n)
+{
+	while (n >= 10) {
+		_ndelay(10000);
+		n -= 10;
+	}
+	while (n-- > 0)
+		_ndelay(1000);
+}
+
+#define udelay(x) _udelay((unsigned int)(x))
+#define ndelay(x) _ndelay((unsigned int)(x))
+
+#endif /* _ASM_C6X_DELAY_H */