| Benjamin Gaignard | a550b54 | 2018-11-27 13:49:50 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause |
| 2 | /* |
| 3 | * Copyright (C) 2018, STMicroelectronics - All Rights Reserved |
| 4 | */ |
| 5 | |
| 6 | #include <common.h> |
| 7 | #include <dm.h> |
| 8 | #include <errno.h> |
| 9 | #include <hwspinlock.h> |
| 10 | #include <dm/device-internal.h> |
| 11 | |
| 12 | static inline const struct hwspinlock_ops * |
| 13 | hwspinlock_dev_ops(struct udevice *dev) |
| 14 | { |
| 15 | return (const struct hwspinlock_ops *)dev->driver->ops; |
| 16 | } |
| 17 | |
| 18 | static int hwspinlock_of_xlate_default(struct hwspinlock *hws, |
| 19 | struct ofnode_phandle_args *args) |
| 20 | { |
| 21 | if (args->args_count > 1) { |
| 22 | debug("Invaild args_count: %d\n", args->args_count); |
| 23 | return -EINVAL; |
| 24 | } |
| 25 | |
| 26 | if (args->args_count) |
| 27 | hws->id = args->args[0]; |
| 28 | else |
| 29 | hws->id = 0; |
| 30 | |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | int hwspinlock_get_by_index(struct udevice *dev, int index, |
| 35 | struct hwspinlock *hws) |
| 36 | { |
| 37 | int ret; |
| 38 | struct ofnode_phandle_args args; |
| 39 | struct udevice *dev_hws; |
| 40 | const struct hwspinlock_ops *ops; |
| 41 | |
| 42 | assert(hws); |
| 43 | hws->dev = NULL; |
| 44 | |
| 45 | ret = dev_read_phandle_with_args(dev, "hwlocks", "#hwlock-cells", 1, |
| 46 | index, &args); |
| 47 | if (ret) { |
| 48 | dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n", |
| 49 | __func__, ret); |
| 50 | return ret; |
| 51 | } |
| 52 | |
| 53 | ret = uclass_get_device_by_ofnode(UCLASS_HWSPINLOCK, |
| 54 | args.node, &dev_hws); |
| 55 | if (ret) { |
| 56 | dev_dbg(dev, |
| 57 | "%s: uclass_get_device_by_of_offset failed: err=%d\n", |
| 58 | __func__, ret); |
| 59 | return ret; |
| 60 | } |
| 61 | |
| 62 | hws->dev = dev_hws; |
| 63 | |
| 64 | ops = hwspinlock_dev_ops(dev_hws); |
| 65 | |
| 66 | if (ops->of_xlate) |
| 67 | ret = ops->of_xlate(hws, &args); |
| 68 | else |
| 69 | ret = hwspinlock_of_xlate_default(hws, &args); |
| 70 | if (ret) |
| 71 | dev_dbg(dev, "of_xlate() failed: %d\n", ret); |
| 72 | |
| 73 | return ret; |
| 74 | } |
| 75 | |
| 76 | int hwspinlock_lock_timeout(struct hwspinlock *hws, unsigned int timeout) |
| 77 | { |
| 78 | const struct hwspinlock_ops *ops; |
| 79 | ulong start; |
| 80 | int ret; |
| 81 | |
| 82 | assert(hws); |
| 83 | |
| 84 | if (!hws->dev) |
| 85 | return -EINVAL; |
| 86 | |
| 87 | ops = hwspinlock_dev_ops(hws->dev); |
| 88 | if (!ops->lock) |
| 89 | return -ENOSYS; |
| 90 | |
| 91 | start = get_timer(0); |
| 92 | do { |
| 93 | ret = ops->lock(hws->dev, hws->id); |
| 94 | if (!ret) |
| 95 | return ret; |
| 96 | |
| 97 | if (ops->relax) |
| 98 | ops->relax(hws->dev); |
| 99 | } while (get_timer(start) < timeout); |
| 100 | |
| 101 | return -ETIMEDOUT; |
| 102 | } |
| 103 | |
| 104 | int hwspinlock_unlock(struct hwspinlock *hws) |
| 105 | { |
| 106 | const struct hwspinlock_ops *ops; |
| 107 | |
| 108 | assert(hws); |
| 109 | |
| 110 | if (!hws->dev) |
| 111 | return -EINVAL; |
| 112 | |
| 113 | ops = hwspinlock_dev_ops(hws->dev); |
| 114 | if (!ops->unlock) |
| 115 | return -ENOSYS; |
| 116 | |
| 117 | return ops->unlock(hws->dev, hws->id); |
| 118 | } |
| 119 | |
| 120 | static int hwspinlock_post_bind(struct udevice *dev) |
| 121 | { |
| 122 | #if defined(CONFIG_NEEDS_MANUAL_RELOC) |
| 123 | struct hwspinlock_ops *ops = device_get_ops(dev); |
| 124 | static int reloc_done; |
| 125 | |
| 126 | if (!reloc_done) { |
| 127 | if (ops->lock) |
| 128 | ops->lock += gd->reloc_off; |
| 129 | if (ops->unlock) |
| 130 | ops->unlock += gd->reloc_off; |
| 131 | if (ops->relax) |
| 132 | ops->relax += gd->reloc_off; |
| 133 | |
| 134 | reloc_done++; |
| 135 | } |
| 136 | #endif |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | UCLASS_DRIVER(hwspinlock) = { |
| 141 | .id = UCLASS_HWSPINLOCK, |
| 142 | .name = "hwspinlock", |
| 143 | .post_bind = hwspinlock_post_bind, |
| 144 | }; |