| Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2014 The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| 5 | * |
| 6 | * |
| 7 | * Permission to use, copy, modify, and/or distribute this software for |
| 8 | * any purpose with or without fee is hereby granted, provided that the |
| 9 | * above copyright notice and this permission notice appear in all |
| 10 | * copies. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| 13 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| 14 | * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| 15 | * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 16 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 17 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 18 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 19 | * PERFORMANCE OF THIS SOFTWARE. |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * This file was originally distributed by Qualcomm Atheros, Inc. |
| 24 | * under proprietary terms before Copyright ownership was assigned |
| 25 | * to the Linux Foundation. |
| 26 | */ |
| 27 | |
| 28 | /** |
| 29 | * DOC: cdf_threads |
| 30 | * |
| 31 | * Connectivity driver framework (CDF) thread APIs |
| 32 | * |
| 33 | */ |
| 34 | |
| 35 | /* Include Files */ |
| 36 | #include <cdf_threads.h> |
| 37 | #include <cdf_trace.h> |
| 38 | #include <linux/jiffies.h> |
| 39 | #include <linux/sched.h> |
| 40 | #include <linux/delay.h> |
| 41 | #include <linux/interrupt.h> |
| 42 | |
| 43 | /* Preprocessor definitions and constants */ |
| 44 | |
| 45 | /* Type declarations */ |
| 46 | |
| 47 | /* Function declarations and documenation */ |
| 48 | |
| 49 | /** |
| 50 | * cdf_sleep() - sleep |
| 51 | * @msInterval : Number of milliseconds to suspend the current thread. |
| 52 | * A value of 0 may or may not cause the current thread to yield. |
| 53 | * |
| 54 | * This function suspends the execution of the current thread |
| 55 | * until the specified time out interval elapses. |
| 56 | * |
| 57 | * Return: nothing |
| 58 | */ |
| 59 | void cdf_sleep(uint32_t msInterval) |
| 60 | { |
| 61 | if (in_interrupt()) { |
| 62 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 63 | "%s cannot be called from interrupt context!!!", |
| 64 | __func__); |
| 65 | return; |
| 66 | } |
| 67 | msleep_interruptible(msInterval); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * cdf_sleep_us() - sleep |
| 72 | * @usInterval : Number of microseconds to suspend the current thread. |
| 73 | * A value of 0 may or may not cause the current thread to yield. |
| 74 | * |
| 75 | * This function suspends the execution of the current thread |
| 76 | * until the specified time out interval elapses. |
| 77 | * |
| 78 | * Return : nothing |
| 79 | */ |
| 80 | void cdf_sleep_us(uint32_t usInterval) |
| 81 | { |
| 82 | unsigned long timeout = usecs_to_jiffies(usInterval) + 1; |
| 83 | if (in_interrupt()) { |
| 84 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 85 | "%s cannot be called from interrupt context!!!", |
| 86 | __func__); |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | while (timeout && !signal_pending(current)) |
| 91 | timeout = schedule_timeout_interruptible(timeout); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * cdf_busy_wait() - busy wait |
| 96 | * @usInterval : Number of microseconds to busy wait. |
| 97 | * |
| 98 | * This function places the current thread in busy wait until the specified |
| 99 | * time out interval elapses. If the interval is greater than 50us on WM, the |
| 100 | * behaviour is undefined. |
| 101 | * |
| 102 | * Return : nothing |
| 103 | */ |
| 104 | void cdf_busy_wait(uint32_t usInterval) |
| 105 | { |
| 106 | udelay(usInterval); |
| 107 | } |