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