mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-24 18:38:38 +00:00
ced0f005c7
- Move EXPORT_SYMBOL lines of delay loop functions from arch/m32r/kernel/m32r_ksyms.c to arch/m32r/lib/delay.c. - Export __ndelay. Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
/*
|
|
* linux/arch/m32r/lib/delay.c
|
|
*
|
|
* Copyright (c) 2002 Hitoshi Yamamoto, Hirokazu Takata
|
|
* Copyright (c) 2004 Hirokazu Takata
|
|
*/
|
|
|
|
#include <linux/param.h>
|
|
#include <linux/module.h>
|
|
#ifdef CONFIG_SMP
|
|
#include <linux/sched.h>
|
|
#include <asm/current.h>
|
|
#include <asm/smp.h>
|
|
#endif /* CONFIG_SMP */
|
|
#include <asm/processor.h>
|
|
|
|
void __delay(unsigned long loops)
|
|
{
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
|
__asm__ __volatile__ (
|
|
"beqz %0, 2f \n\t"
|
|
"addi %0, #-1 \n\t"
|
|
|
|
" .fillinsn \n\t"
|
|
"1: \n\t"
|
|
"cmpz %0 || addi %0, #-1 \n\t"
|
|
"bc 2f || cmpz %0 \n\t"
|
|
"bc 2f || addi %0, #-1 \n\t"
|
|
"cmpz %0 || addi %0, #-1 \n\t"
|
|
"bc 2f || cmpz %0 \n\t"
|
|
"bnc 1b || addi %0, #-1 \n\t"
|
|
" .fillinsn \n\t"
|
|
"2: \n\t"
|
|
: "+r" (loops)
|
|
: "r" (0)
|
|
: "cbit"
|
|
);
|
|
#else
|
|
__asm__ __volatile__ (
|
|
"beqz %0, 2f \n\t"
|
|
" .fillinsn \n\t"
|
|
"1: \n\t"
|
|
"addi %0, #-1 \n\t"
|
|
"blez %0, 2f \n\t"
|
|
"addi %0, #-1 \n\t"
|
|
"blez %0, 2f \n\t"
|
|
"addi %0, #-1 \n\t"
|
|
"blez %0, 2f \n\t"
|
|
"addi %0, #-1 \n\t"
|
|
"bgtz %0, 1b \n\t"
|
|
" .fillinsn \n\t"
|
|
"2: \n\t"
|
|
: "+r" (loops)
|
|
: "r" (0)
|
|
);
|
|
#endif
|
|
}
|
|
|
|
void __const_udelay(unsigned long xloops)
|
|
{
|
|
#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
|
|
/*
|
|
* loops [1] = (xloops >> 32) [sec] * loops_per_jiffy [1/jiffy]
|
|
* * HZ [jiffy/sec]
|
|
* = (xloops >> 32) [sec] * (loops_per_jiffy * HZ) [1/sec]
|
|
* = (((xloops * loops_per_jiffy) >> 32) * HZ) [1]
|
|
*
|
|
* NOTE:
|
|
* - '[]' depicts variable's dimension in the above equation.
|
|
* - "rac" instruction rounds the accumulator in word size.
|
|
*/
|
|
__asm__ __volatile__ (
|
|
"srli %0, #1 \n\t"
|
|
"mulwhi %0, %1 ; a0 \n\t"
|
|
"mulwu1 %0, %1 ; a1 \n\t"
|
|
"sadd ; a0 += (a1 >> 16) \n\t"
|
|
"rac a0, a0, #1 \n\t"
|
|
"mvfacmi %0, a0 \n\t"
|
|
: "+r" (xloops)
|
|
: "r" (current_cpu_data.loops_per_jiffy)
|
|
: "a0", "a1"
|
|
);
|
|
#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
|
|
/*
|
|
* u64 ull;
|
|
* ull = (u64)xloops * (u64)current_cpu_data.loops_per_jiffy;
|
|
* xloops = (ull >> 32);
|
|
*/
|
|
__asm__ __volatile__ (
|
|
"and3 r4, %0, #0xffff \n\t"
|
|
"and3 r5, %1, #0xffff \n\t"
|
|
"mul r4, r5 \n\t"
|
|
"srl3 r6, %0, #16 \n\t"
|
|
"srli r4, #16 \n\t"
|
|
"mul r5, r6 \n\t"
|
|
"add r4, r5 \n\t"
|
|
"and3 r5, %0, #0xffff \n\t"
|
|
"srl3 r6, %1, #16 \n\t"
|
|
"mul r5, r6 \n\t"
|
|
"add r4, r5 \n\t"
|
|
"srl3 r5, %0, #16 \n\t"
|
|
"srli r4, #16 \n\t"
|
|
"mul r5, r6 \n\t"
|
|
"add r4, r5 \n\t"
|
|
"mv %0, r4 \n\t"
|
|
: "+r" (xloops)
|
|
: "r" (current_cpu_data.loops_per_jiffy)
|
|
: "r4", "r5", "r6"
|
|
);
|
|
#else
|
|
#error unknown isa configuration
|
|
#endif
|
|
__delay(xloops * HZ);
|
|
}
|
|
|
|
void __udelay(unsigned long usecs)
|
|
{
|
|
__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
|
|
}
|
|
|
|
void __ndelay(unsigned long nsecs)
|
|
{
|
|
__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
|
|
}
|
|
|
|
EXPORT_SYMBOL(__delay);
|
|
EXPORT_SYMBOL(__const_udelay);
|
|
EXPORT_SYMBOL(__udelay);
|
|
EXPORT_SYMBOL(__ndelay);
|