Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * include/asm-xtensa/delay.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Copyright (C) 2001 - 2005 Tensilica Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #ifndef _XTENSA_DELAY_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define _XTENSA_DELAY_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/timex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/param.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) extern unsigned long loops_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static inline void __delay(unsigned long loops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	if (__builtin_constant_p(loops) && loops < 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		__asm__ __volatile__ ("nop");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	else if (loops >= 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		/* 2 cycles per loop. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		__asm__ __volatile__ ("1: addi %0, %0, -2; bgeui %0, 2, 1b"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 				: "+r" (loops));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* Undefined function to get compile-time error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) void __bad_udelay(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) void __bad_ndelay(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define __MAX_UDELAY 30000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define __MAX_NDELAY 30000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static inline void __udelay(unsigned long usecs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	unsigned long start = get_ccount();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	unsigned long cycles = (usecs * (ccount_freq >> 15)) >> 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	/* Note: all variables are unsigned (can wrap around)! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	while (((unsigned long)get_ccount()) - start < cycles)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static inline void udelay(unsigned long usec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (__builtin_constant_p(usec) && usec >= __MAX_UDELAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		__bad_udelay();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		__udelay(usec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static inline void __ndelay(unsigned long nsec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	 * Inner shift makes sure multiplication doesn't overflow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	 * for legitimate nsec values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	unsigned long cycles = (nsec * (ccount_freq >> 15)) >> 15;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	__delay(cycles);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define ndelay(n) ndelay(n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static inline void ndelay(unsigned long nsec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	if (__builtin_constant_p(nsec) && nsec >= __MAX_NDELAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 		__bad_ndelay();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 		__ndelay(nsec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #endif