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5636919b RB |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 by Waldorf Electronics | |
7 | * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
2db4bc34 | 9 | * Copyright (C) 2007, 2014 Maciej W. Rozycki |
5636919b RB |
10 | */ |
11 | #include <linux/module.h> | |
12 | #include <linux/param.h> | |
13 | #include <linux/smp.h> | |
e496453d | 14 | #include <linux/stringify.h> |
5636919b | 15 | |
e496453d | 16 | #include <asm/asm.h> |
5636919b RB |
17 | #include <asm/compiler.h> |
18 | #include <asm/war.h> | |
19 | ||
2db4bc34 MR |
20 | #ifndef CONFIG_CPU_DADDI_WORKAROUNDS |
21 | #define GCC_DADDI_IMM_ASM() "I" | |
22 | #else | |
23 | #define GCC_DADDI_IMM_ASM() "r" | |
24 | #endif | |
25 | ||
5210edcd | 26 | void __delay(unsigned long loops) |
5636919b RB |
27 | { |
28 | __asm__ __volatile__ ( | |
29 | " .set noreorder \n" | |
30 | " .align 3 \n" | |
31 | "1: bnez %0, 1b \n" | |
e496453d | 32 | " " __stringify(LONG_SUBU) " %0, %1 \n" |
5636919b RB |
33 | " .set reorder \n" |
34 | : "=r" (loops) | |
2db4bc34 | 35 | : GCC_DADDI_IMM_ASM() (1), "0" (loops)); |
5636919b RB |
36 | } |
37 | EXPORT_SYMBOL(__delay); | |
38 | ||
39 | /* | |
40 | * Division by multiplication: you don't have to worry about | |
41 | * loss of precision. | |
42 | * | |
70342287 | 43 | * Use only for very small delays ( < 1 msec). Should probably use a |
5636919b RB |
44 | * lookup table, really, as the multiplications take much too long with |
45 | * short delays. This is a "reasonable" implementation, though (and the | |
46 | * first constant multiplications gets optimized away if the delay is | |
47 | * a constant) | |
48 | */ | |
49 | ||
50 | void __udelay(unsigned long us) | |
51 | { | |
abe5b417 | 52 | unsigned int lpj = raw_current_cpu_data.udelay_val; |
5636919b | 53 | |
3cb3a66c | 54 | __delay((us * 0x000010c7ull * HZ * lpj) >> 32); |
5636919b RB |
55 | } |
56 | EXPORT_SYMBOL(__udelay); | |
57 | ||
58 | void __ndelay(unsigned long ns) | |
59 | { | |
abe5b417 | 60 | unsigned int lpj = raw_current_cpu_data.udelay_val; |
5636919b | 61 | |
3cb3a66c | 62 | __delay((ns * 0x00000005ull * HZ * lpj) >> 32); |
5636919b RB |
63 | } |
64 | EXPORT_SYMBOL(__ndelay); |