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69 lines
1.7 KiB
69 lines
1.7 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1994 by Waldorf Electronics |
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* Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle |
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
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* Copyright (C) 2007, 2014 Maciej W. Rozycki |
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*/ |
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#include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/param.h> |
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#include <linux/smp.h> |
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#include <linux/stringify.h> |
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#include <asm/asm.h> |
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#include <asm/compiler.h> |
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#include <asm/war.h> |
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#ifndef CONFIG_CPU_DADDI_WORKAROUNDS |
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#define GCC_DADDI_IMM_ASM() "I" |
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#else |
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#define GCC_DADDI_IMM_ASM() "r" |
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#endif |
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#ifndef CONFIG_HAVE_PLAT_DELAY |
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void __delay(unsigned long loops) |
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{ |
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__asm__ __volatile__ ( |
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" .set noreorder \n" |
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" .align 3 \n" |
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"1: bnez %0, 1b \n" |
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" " __stringify(LONG_SUBU) " %0, %1 \n" |
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" .set reorder \n" |
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: "=r" (loops) |
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: GCC_DADDI_IMM_ASM() (1), "0" (loops)); |
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} |
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EXPORT_SYMBOL(__delay); |
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/* |
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* Division by multiplication: you don't have to worry about |
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* loss of precision. |
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* |
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* Use only for very small delays ( < 1 msec). Should probably use a |
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* lookup table, really, as the multiplications take much too long with |
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* short delays. This is a "reasonable" implementation, though (and the |
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* first constant multiplications gets optimized away if the delay is |
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* a constant) |
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*/ |
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void __udelay(unsigned long us) |
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{ |
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unsigned int lpj = raw_current_cpu_data.udelay_val; |
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__delay((us * 0x000010c7ull * HZ * lpj) >> 32); |
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} |
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EXPORT_SYMBOL(__udelay); |
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void __ndelay(unsigned long ns) |
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{ |
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unsigned int lpj = raw_current_cpu_data.udelay_val; |
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__delay((ns * 0x00000005ull * HZ * lpj) >> 32); |
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} |
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EXPORT_SYMBOL(__ndelay); |
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#endif
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