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- // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
- /*
- * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
- */
- #define LOG_CATEGORY UCLASS_HWSPINLOCK
- #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>
- #include <asm/global_data.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,
- };
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