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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 | |||
| 1264 | jermar | 29 | /** |
| 30 | * @file delay.c |
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| 31 | * @brief Active delay function. |
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| 32 | */ |
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| 33 | |||
| 1 | jermar | 34 | #include <time/delay.h> |
| 35 | #include <arch/types.h> |
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| 36 | #include <cpu.h> |
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| 37 | #include <arch/asm.h> |
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| 38 | #include <arch.h> |
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| 39 | |||
| 107 | decky | 40 | /** Active delay |
| 41 | * |
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| 42 | * Delay the execution for the given number |
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| 43 | * of microseconds (or slightly more). The delay |
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| 44 | * is implemented as CPU calibrated active loop. |
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| 45 | * |
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| 404 | jermar | 46 | * @param usec Number of microseconds to sleep. |
| 1 | jermar | 47 | */ |
| 404 | jermar | 48 | void delay(__u32 usec) |
| 1 | jermar | 49 | { |
| 413 | jermar | 50 | ipl_t ipl; |
| 107 | decky | 51 | |
| 413 | jermar | 52 | /* |
| 53 | * The delay loop is calibrated for each and every |
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| 54 | * CPU in the system. Therefore it is necessary to |
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| 55 | * call interrupts_disable() before calling the |
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| 56 | * asm_delay_loop(). |
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| 57 | */ |
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| 58 | ipl = interrupts_disable(); |
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| 404 | jermar | 59 | asm_delay_loop(usec * CPU->delay_loop_const); |
| 413 | jermar | 60 | interrupts_restore(ipl); |
| 1 | jermar | 61 | } |