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