Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | #ifndef _ASM_IA64_DELAY_H |
| 2 | #define _ASM_IA64_DELAY_H |
| 3 | |
| 4 | /* |
| 5 | * Delay routines using a pre-computed "cycles/usec" value. |
| 6 | * |
| 7 | * Copyright (C) 1998, 1999 Hewlett-Packard Co |
| 8 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 9 | * Copyright (C) 1999 VA Linux Systems |
| 10 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> |
| 11 | * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com> |
| 12 | * Copyright (C) 1999 Don Dugger <don.dugger@intel.com> |
| 13 | */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/compiler.h> |
| 19 | |
| 20 | #include <asm/intrinsics.h> |
| 21 | #include <asm/processor.h> |
| 22 | |
| 23 | static __inline__ void |
| 24 | ia64_set_itm (unsigned long val) |
| 25 | { |
| 26 | ia64_setreg(_IA64_REG_CR_ITM, val); |
| 27 | ia64_srlz_d(); |
| 28 | } |
| 29 | |
| 30 | static __inline__ unsigned long |
| 31 | ia64_get_itm (void) |
| 32 | { |
| 33 | unsigned long result; |
| 34 | |
| 35 | result = ia64_getreg(_IA64_REG_CR_ITM); |
| 36 | ia64_srlz_d(); |
| 37 | return result; |
| 38 | } |
| 39 | |
| 40 | static __inline__ void |
| 41 | ia64_set_itv (unsigned long val) |
| 42 | { |
| 43 | ia64_setreg(_IA64_REG_CR_ITV, val); |
| 44 | ia64_srlz_d(); |
| 45 | } |
| 46 | |
| 47 | static __inline__ unsigned long |
| 48 | ia64_get_itv (void) |
| 49 | { |
| 50 | return ia64_getreg(_IA64_REG_CR_ITV); |
| 51 | } |
| 52 | |
| 53 | static __inline__ void |
| 54 | ia64_set_itc (unsigned long val) |
| 55 | { |
| 56 | ia64_setreg(_IA64_REG_AR_ITC, val); |
| 57 | ia64_srlz_d(); |
| 58 | } |
| 59 | |
| 60 | static __inline__ unsigned long |
| 61 | ia64_get_itc (void) |
| 62 | { |
| 63 | unsigned long result; |
| 64 | |
| 65 | result = ia64_getreg(_IA64_REG_AR_ITC); |
| 66 | ia64_barrier(); |
| 67 | #ifdef CONFIG_ITANIUM |
| 68 | while (unlikely((__s32) result == -1)) { |
| 69 | result = ia64_getreg(_IA64_REG_AR_ITC); |
| 70 | ia64_barrier(); |
| 71 | } |
| 72 | #endif |
| 73 | return result; |
| 74 | } |
| 75 | |
| 76 | extern void ia64_delay_loop (unsigned long loops); |
| 77 | |
| 78 | static __inline__ void |
| 79 | __delay (unsigned long loops) |
| 80 | { |
| 81 | if (unlikely(loops < 1)) |
| 82 | return; |
| 83 | |
| 84 | ia64_delay_loop (loops - 1); |
| 85 | } |
| 86 | |
| 87 | static __inline__ void |
| 88 | udelay (unsigned long usecs) |
| 89 | { |
| 90 | unsigned long start = ia64_get_itc(); |
| 91 | unsigned long cycles = usecs*local_cpu_data->cyc_per_usec; |
| 92 | |
| 93 | while (ia64_get_itc() - start < cycles) |
| 94 | cpu_relax(); |
| 95 | } |
| 96 | |
| 97 | #endif /* _ASM_IA64_DELAY_H */ |