diff options
Diffstat (limited to 'arch/mips/include/asm/delay.h')
| -rw-r--r-- | arch/mips/include/asm/delay.h | 92 |
1 files changed, 5 insertions, 87 deletions
diff --git a/arch/mips/include/asm/delay.h b/arch/mips/include/asm/delay.h index b0bccd2c4ed5..a07e51b2be13 100644 --- a/arch/mips/include/asm/delay.h +++ b/arch/mips/include/asm/delay.h | |||
| @@ -11,94 +11,12 @@ | |||
| 11 | #ifndef _ASM_DELAY_H | 11 | #ifndef _ASM_DELAY_H |
| 12 | #define _ASM_DELAY_H | 12 | #define _ASM_DELAY_H |
| 13 | 13 | ||
| 14 | #include <linux/param.h> | 14 | extern void __delay(unsigned int loops); |
| 15 | #include <linux/smp.h> | 15 | extern void __ndelay(unsigned int ns); |
| 16 | extern void __udelay(unsigned int us); | ||
| 16 | 17 | ||
| 17 | #include <asm/compiler.h> | 18 | #define ndelay(ns) __udelay(ns) |
| 18 | #include <asm/war.h> | 19 | #define udelay(us) __udelay(us) |
| 19 | |||
| 20 | static inline void __delay(unsigned long loops) | ||
| 21 | { | ||
| 22 | if (sizeof(long) == 4) | ||
| 23 | __asm__ __volatile__ ( | ||
| 24 | " .set noreorder \n" | ||
| 25 | " .align 3 \n" | ||
| 26 | "1: bnez %0, 1b \n" | ||
| 27 | " subu %0, 1 \n" | ||
| 28 | " .set reorder \n" | ||
| 29 | : "=r" (loops) | ||
| 30 | : "0" (loops)); | ||
| 31 | else if (sizeof(long) == 8 && !DADDI_WAR) | ||
| 32 | __asm__ __volatile__ ( | ||
| 33 | " .set noreorder \n" | ||
| 34 | " .align 3 \n" | ||
| 35 | "1: bnez %0, 1b \n" | ||
| 36 | " dsubu %0, 1 \n" | ||
| 37 | " .set reorder \n" | ||
| 38 | : "=r" (loops) | ||
| 39 | : "0" (loops)); | ||
| 40 | else if (sizeof(long) == 8 && DADDI_WAR) | ||
| 41 | __asm__ __volatile__ ( | ||
| 42 | " .set noreorder \n" | ||
| 43 | " .align 3 \n" | ||
| 44 | "1: bnez %0, 1b \n" | ||
| 45 | " dsubu %0, %2 \n" | ||
| 46 | " .set reorder \n" | ||
| 47 | : "=r" (loops) | ||
| 48 | : "0" (loops), "r" (1)); | ||
| 49 | } | ||
| 50 | |||
| 51 | |||
| 52 | /* | ||
| 53 | * Division by multiplication: you don't have to worry about | ||
| 54 | * loss of precision. | ||
| 55 | * | ||
| 56 | * Use only for very small delays ( < 1 msec). Should probably use a | ||
| 57 | * lookup table, really, as the multiplications take much too long with | ||
| 58 | * short delays. This is a "reasonable" implementation, though (and the | ||
| 59 | * first constant multiplications gets optimized away if the delay is | ||
| 60 | * a constant) | ||
| 61 | */ | ||
| 62 | |||
| 63 | static inline void __udelay(unsigned long usecs, unsigned long lpj) | ||
| 64 | { | ||
| 65 | unsigned long hi, lo; | ||
| 66 | |||
| 67 | /* | ||
| 68 | * The rates of 128 is rounded wrongly by the catchall case | ||
| 69 | * for 64-bit. Excessive precission? Probably ... | ||
| 70 | */ | ||
| 71 | #if defined(CONFIG_64BIT) && (HZ == 128) | ||
| 72 | usecs *= 0x0008637bd05af6c7UL; /* 2**64 / (1000000 / HZ) */ | ||
| 73 | #elif defined(CONFIG_64BIT) | ||
| 74 | usecs *= (0x8000000000000000UL / (500000 / HZ)); | ||
| 75 | #else /* 32-bit junk follows here */ | ||
| 76 | usecs *= (unsigned long) (((0x8000000000000000ULL / (500000 / HZ)) + | ||
| 77 | 0x80000000ULL) >> 32); | ||
| 78 | #endif | ||
| 79 | |||
| 80 | if (sizeof(long) == 4) | ||
| 81 | __asm__("multu\t%2, %3" | ||
| 82 | : "=h" (usecs), "=l" (lo) | ||
| 83 | : "r" (usecs), "r" (lpj) | ||
| 84 | : GCC_REG_ACCUM); | ||
| 85 | else if (sizeof(long) == 8 && !R4000_WAR) | ||
| 86 | __asm__("dmultu\t%2, %3" | ||
| 87 | : "=h" (usecs), "=l" (lo) | ||
| 88 | : "r" (usecs), "r" (lpj) | ||
| 89 | : GCC_REG_ACCUM); | ||
| 90 | else if (sizeof(long) == 8 && R4000_WAR) | ||
| 91 | __asm__("dmultu\t%3, %4\n\tmfhi\t%0" | ||
| 92 | : "=r" (usecs), "=h" (hi), "=l" (lo) | ||
| 93 | : "r" (usecs), "r" (lpj) | ||
| 94 | : GCC_REG_ACCUM); | ||
| 95 | |||
| 96 | __delay(usecs); | ||
| 97 | } | ||
| 98 | |||
| 99 | #define __udelay_val cpu_data[raw_smp_processor_id()].udelay_val | ||
| 100 | |||
| 101 | #define udelay(usecs) __udelay((usecs), __udelay_val) | ||
| 102 | 20 | ||
| 103 | /* make sure "usecs *= ..." in udelay do not overflow. */ | 21 | /* make sure "usecs *= ..." in udelay do not overflow. */ |
| 104 | #if HZ >= 1000 | 22 | #if HZ >= 1000 |