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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1731 | jermar | 29 | /** @addtogroup time |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | |||
| 1264 | jermar | 33 | /** |
| 1702 | cejka | 34 | * @file |
| 1264 | jermar | 35 | * @brief Active delay function. |
| 36 | */ |
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| 37 | |||
| 1 | jermar | 38 | #include <time/delay.h> |
| 39 | #include <arch/types.h> |
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| 40 | #include <cpu.h> |
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| 41 | #include <arch/asm.h> |
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| 42 | #include <arch.h> |
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| 43 | |||
| 107 | decky | 44 | /** Active delay |
| 45 | * |
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| 46 | * Delay the execution for the given number |
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| 47 | * of microseconds (or slightly more). The delay |
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| 48 | * is implemented as CPU calibrated active loop. |
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| 49 | * |
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| 404 | jermar | 50 | * @param usec Number of microseconds to sleep. |
| 1 | jermar | 51 | */ |
| 404 | jermar | 52 | void delay(__u32 usec) |
| 1 | jermar | 53 | { |
| 413 | jermar | 54 | ipl_t ipl; |
| 107 | decky | 55 | |
| 413 | jermar | 56 | /* |
| 57 | * The delay loop is calibrated for each and every |
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| 58 | * CPU in the system. Therefore it is necessary to |
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| 59 | * call interrupts_disable() before calling the |
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| 60 | * asm_delay_loop(). |
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| 61 | */ |
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| 62 | ipl = interrupts_disable(); |
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| 404 | jermar | 63 | asm_delay_loop(usec * CPU->delay_loop_const); |
| 413 | jermar | 64 | interrupts_restore(ipl); |
| 1 | jermar | 65 | } |
| 1702 | cejka | 66 | |
| 1731 | jermar | 67 | /** @} |
| 1702 | cejka | 68 | */ |