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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause /* * Copyright (C) 2018, STMicroelectronics - All Rights Reserved */ #include <common.h> #include <dm.h> #include <errno.h> #include <hwspinlock.h> #include <log.h> #include <dm/device-internal.h> #include <dm/device_compat.h> #include <linux/compat.h> static inline const struct hwspinlock_ops * hwspinlock_dev_ops(struct udevice *dev) { return (const struct hwspinlock_ops *)dev->driver->ops; } static int hwspinlock_of_xlate_default(struct hwspinlock *hws, struct ofnode_phandle_args *args) { if (args->args_count > 1) { debug("Invaild args_count: %d\n", args->args_count); return -EINVAL; } if (args->args_count) hws->id = args->args[0]; else hws->id = 0; return 0; } int hwspinlock_get_by_index(struct udevice *dev, int index, struct hwspinlock *hws) { int ret; struct ofnode_phandle_args args; struct udevice *dev_hws; const struct hwspinlock_ops *ops; assert(hws); hws->dev = NULL; ret = dev_read_phandle_with_args(dev, "hwlocks", "#hwlock-cells", 1, index, &args); if (ret) { dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n", __func__, ret); return ret; } ret = uclass_get_device_by_ofnode(UCLASS_HWSPINLOCK, args.node, &dev_hws); if (ret) { dev_dbg(dev, "%s: uclass_get_device_by_of_offset failed: err=%d\n", __func__, ret); return ret; } hws->dev = dev_hws; ops = hwspinlock_dev_ops(dev_hws); if (ops->of_xlate) ret = ops->of_xlate(hws, &args); else ret = hwspinlock_of_xlate_default(hws, &args); if (ret) dev_dbg(dev, "of_xlate() failed: %d\n", ret); return ret; } int hwspinlock_lock_timeout(struct hwspinlock *hws, unsigned int timeout) { const struct hwspinlock_ops *ops; ulong start; int ret; assert(hws); if (!hws->dev) return -EINVAL; ops = hwspinlock_dev_ops(hws->dev); if (!ops->lock) return -ENOSYS; start = get_timer(0); do { ret = ops->lock(hws->dev, hws->id); if (!ret) return ret; if (ops->relax) ops->relax(hws->dev); } while (get_timer(start) < timeout); return -ETIMEDOUT; } int hwspinlock_unlock(struct hwspinlock *hws) { const struct hwspinlock_ops *ops; assert(hws); if (!hws->dev) return -EINVAL; ops = hwspinlock_dev_ops(hws->dev); if (!ops->unlock) return -ENOSYS; return ops->unlock(hws->dev, hws->id); } static int hwspinlock_post_bind(struct udevice *dev) { #if defined(CONFIG_NEEDS_MANUAL_RELOC) struct hwspinlock_ops *ops = device_get_ops(dev); static int reloc_done; if (!reloc_done) { if (ops->lock) ops->lock += gd->reloc_off; if (ops->unlock) ops->unlock += gd->reloc_off; if (ops->relax) ops->relax += gd->reloc_off; reloc_done++; } #endif return 0; } UCLASS_DRIVER(hwspinlock) = { .id = UCLASS_HWSPINLOCK, .name = "hwspinlock", .post_bind = hwspinlock_post_bind, }; |