projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 7f84fc67 BG |
1 | // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause |
| 2 | /* | |
| 3 | * Copyright (C) 2018, STMicroelectronics - All Rights Reserved | |
| 4 | */ | |
| 5 | ||
| b953ec2b PD |
6 | #define LOG_CATEGORY UCLASS_HWSPINLOCK |
| 7 | ||
| d678a59d | 8 | #include <common.h> |
| 7f84fc67 BG |
9 | #include <dm.h> |
| 10 | #include <errno.h> | |
| 11 | #include <hwspinlock.h> | |
| f7ae49fc | 12 | #include <log.h> |
| 7f84fc67 | 13 | #include <dm/device-internal.h> |
| 336d4615 SG |
14 | #include <dm/device_compat.h> |
| 15 | #include <linux/compat.h> | |
| 401d1c4f | 16 | #include <asm/global_data.h> |
| 7f84fc67 BG |
17 | |
| 18 | static inline const struct hwspinlock_ops * | |
| 19 | hwspinlock_dev_ops(struct udevice *dev) | |
| 20 | { | |
| 21 | return (const struct hwspinlock_ops *)dev->driver->ops; | |
| 22 | } | |
| 23 | ||
| 24 | static int hwspinlock_of_xlate_default(struct hwspinlock *hws, | |
| 25 | struct ofnode_phandle_args *args) | |
| 26 | { | |
| 27 | if (args->args_count > 1) { | |
| 46ad7cef | 28 | debug("Invalid args_count: %d\n", args->args_count); |
| 7f84fc67 BG |
29 | return -EINVAL; |
| 30 | } | |
| 31 | ||
| 32 | if (args->args_count) | |
| 33 | hws->id = args->args[0]; | |
| 34 | else | |
| 35 | hws->id = 0; | |
| 36 | ||
| 37 | return 0; | |
| 38 | } | |
| 39 | ||
| 40 | int hwspinlock_get_by_index(struct udevice *dev, int index, | |
| 41 | struct hwspinlock *hws) | |
| 42 | { | |
| 43 | int ret; | |
| 44 | struct ofnode_phandle_args args; | |
| 45 | struct udevice *dev_hws; | |
| 46 | const struct hwspinlock_ops *ops; | |
| 47 | ||
| 48 | assert(hws); | |
| 49 | hws->dev = NULL; | |
| 50 | ||
| 51 | ret = dev_read_phandle_with_args(dev, "hwlocks", "#hwlock-cells", 1, | |
| 52 | index, &args); | |
| 53 | if (ret) { | |
| 54 | dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n", | |
| 55 | __func__, ret); | |
| 56 | return ret; | |
| 57 | } | |
| 58 | ||
| 59 | ret = uclass_get_device_by_ofnode(UCLASS_HWSPINLOCK, | |
| 60 | args.node, &dev_hws); | |
| 61 | if (ret) { | |
| 62 | dev_dbg(dev, | |
| 63 | "%s: uclass_get_device_by_of_offset failed: err=%d\n", | |
| 64 | __func__, ret); | |
| 65 | return ret; | |
| 66 | } | |
| 67 | ||
| 68 | hws->dev = dev_hws; | |
| 69 | ||
| 70 | ops = hwspinlock_dev_ops(dev_hws); | |
| 71 | ||
| 72 | if (ops->of_xlate) | |
| 73 | ret = ops->of_xlate(hws, &args); | |
| 74 | else | |
| 75 | ret = hwspinlock_of_xlate_default(hws, &args); | |
| 76 | if (ret) | |
| 77 | dev_dbg(dev, "of_xlate() failed: %d\n", ret); | |
| 78 | ||
| 79 | return ret; | |
| 80 | } | |
| 81 | ||
| 82 | int hwspinlock_lock_timeout(struct hwspinlock *hws, unsigned int timeout) | |
| 83 | { | |
| 84 | const struct hwspinlock_ops *ops; | |
| 85 | ulong start; | |
| 86 | int ret; | |
| 87 | ||
| 88 | assert(hws); | |
| 89 | ||
| 90 | if (!hws->dev) | |
| 91 | return -EINVAL; | |
| 92 | ||
| 93 | ops = hwspinlock_dev_ops(hws->dev); | |
| 94 | if (!ops->lock) | |
| 95 | return -ENOSYS; | |
| 96 | ||
| 97 | start = get_timer(0); | |
| 98 | do { | |
| 99 | ret = ops->lock(hws->dev, hws->id); | |
| 100 | if (!ret) | |
| 101 | return ret; | |
| 102 | ||
| 103 | if (ops->relax) | |
| 104 | ops->relax(hws->dev); | |
| 105 | } while (get_timer(start) < timeout); | |
| 106 | ||
| 107 | return -ETIMEDOUT; | |
| 108 | } | |
| 109 | ||
| 110 | int hwspinlock_unlock(struct hwspinlock *hws) | |
| 111 | { | |
| 112 | const struct hwspinlock_ops *ops; | |
| 113 | ||
| 114 | assert(hws); | |
| 115 | ||
| 116 | if (!hws->dev) | |
| 117 | return -EINVAL; | |
| 118 | ||
| 119 | ops = hwspinlock_dev_ops(hws->dev); | |
| 120 | if (!ops->unlock) | |
| 121 | return -ENOSYS; | |
| 122 | ||
| 123 | return ops->unlock(hws->dev, hws->id); | |
| 124 | } | |
| 125 | ||
| 7f84fc67 BG |
126 | UCLASS_DRIVER(hwspinlock) = { |
| 127 | .id = UCLASS_HWSPINLOCK, | |
| 128 | .name = "hwspinlock", | |
| 7f84fc67 | 129 | }; |