mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-16 17:43:56 +08:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Port on Texas Instruments TMS320C6x architecture
|
|
*
|
|
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
|
|
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
|
|
*/
|
|
#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 */
|