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https://github.com/AsahiLinux/u-boot
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This is uclass for Hardware Spinlocks. It implements two mandatory operations: lock and unlock and one optional relax operation. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
144 lines
2.7 KiB
C
144 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <hwspinlock.h>
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#include <dm/device-internal.h>
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static inline const struct hwspinlock_ops *
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hwspinlock_dev_ops(struct udevice *dev)
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{
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return (const struct hwspinlock_ops *)dev->driver->ops;
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}
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static int hwspinlock_of_xlate_default(struct hwspinlock *hws,
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struct ofnode_phandle_args *args)
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{
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if (args->args_count > 1) {
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debug("Invaild args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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if (args->args_count)
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hws->id = args->args[0];
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else
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hws->id = 0;
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return 0;
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}
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int hwspinlock_get_by_index(struct udevice *dev, int index,
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struct hwspinlock *hws)
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{
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int ret;
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struct ofnode_phandle_args args;
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struct udevice *dev_hws;
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const struct hwspinlock_ops *ops;
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assert(hws);
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hws->dev = NULL;
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ret = dev_read_phandle_with_args(dev, "hwlocks", "#hwlock-cells", 1,
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index, &args);
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if (ret) {
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dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n",
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__func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_HWSPINLOCK,
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args.node, &dev_hws);
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if (ret) {
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dev_dbg(dev,
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"%s: uclass_get_device_by_of_offset failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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hws->dev = dev_hws;
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ops = hwspinlock_dev_ops(dev_hws);
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if (ops->of_xlate)
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ret = ops->of_xlate(hws, &args);
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else
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ret = hwspinlock_of_xlate_default(hws, &args);
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if (ret)
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dev_dbg(dev, "of_xlate() failed: %d\n", ret);
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return ret;
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}
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int hwspinlock_lock_timeout(struct hwspinlock *hws, unsigned int timeout)
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{
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const struct hwspinlock_ops *ops;
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ulong start;
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int ret;
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assert(hws);
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if (!hws->dev)
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return -EINVAL;
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ops = hwspinlock_dev_ops(hws->dev);
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if (!ops->lock)
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return -ENOSYS;
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start = get_timer(0);
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do {
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ret = ops->lock(hws->dev, hws->id);
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if (!ret)
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return ret;
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if (ops->relax)
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ops->relax(hws->dev);
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} while (get_timer(start) < timeout);
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return -ETIMEDOUT;
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}
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int hwspinlock_unlock(struct hwspinlock *hws)
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{
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const struct hwspinlock_ops *ops;
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assert(hws);
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if (!hws->dev)
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return -EINVAL;
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ops = hwspinlock_dev_ops(hws->dev);
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if (!ops->unlock)
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return -ENOSYS;
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return ops->unlock(hws->dev, hws->id);
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}
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static int hwspinlock_post_bind(struct udevice *dev)
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{
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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struct hwspinlock_ops *ops = device_get_ops(dev);
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static int reloc_done;
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if (!reloc_done) {
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if (ops->lock)
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ops->lock += gd->reloc_off;
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if (ops->unlock)
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ops->unlock += gd->reloc_off;
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if (ops->relax)
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ops->relax += gd->reloc_off;
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reloc_done++;
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}
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#endif
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return 0;
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}
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UCLASS_DRIVER(hwspinlock) = {
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.id = UCLASS_HWSPINLOCK,
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.name = "hwspinlock",
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.post_bind = hwspinlock_post_bind,
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};
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