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/*
 *  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 */

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Name Type Size Permission Actions
Kbuild File 865 B 0644
asm-offsets.h File 35 B 0644
bitops.h File 2.17 KB 0644
bug.h File 705 B 0644
cache.h File 3.1 KB 0644
cacheflush.h File 2.05 KB 0644
checksum.h File 947 B 0644
clock.h File 3.51 KB 0644
cmpxchg.h File 1.57 KB 0644
delay.h File 1.67 KB 0644
dma-mapping.h File 911 B 0644
dscr.h File 909 B 0644
elf.h File 3.18 KB 0644
flat.h File 677 B 0644
ftrace.h File 97 B 0644
hardirq.h File 572 B 0644
irq.h File 1.59 KB 0644
irqflags.h File 1.67 KB 0644
linkage.h File 497 B 0644
megamod-pic.h File 213 B 0644
module.h File 639 B 0644
page.h File 312 B 0644
pgtable.h File 2.29 KB 0644
processor.h File 3.31 KB 0644
procinfo.h File 673 B 0644
ptrace.h File 998 B 0644
sections.h File 287 B 0644
setup.h File 914 B 0644
soc.h File 929 B 0644
special_insns.h File 1.82 KB 0644
string.h File 616 B 0644
switch_to.h File 992 B 0644
syscall.h File 2.2 KB 0644
syscalls.h File 1.73 KB 0644
thread_info.h File 2.63 KB 0644
timer64.h File 154 B 0644
timex.h File 867 B 0644
tlb.h File 192 B 0644
traps.h File 1.29 KB 0644
uaccess.h File 2.14 KB 0644
unaligned.h File 4.63 KB 0644