1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016, NVIDIA CORPORATION.
9 #include <mailbox-uclass.h>
13 static inline struct mbox_ops *mbox_dev_ops(struct udevice *dev)
15 return (struct mbox_ops *)dev->driver->ops;
18 static int mbox_of_xlate_default(struct mbox_chan *chan,
19 struct ofnode_phandle_args *args)
21 debug("%s(chan=%p)\n", __func__, chan);
23 if (args->args_count != 1) {
24 debug("Invaild args_count: %d\n", args->args_count);
28 chan->id = args->args[0];
33 int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan)
35 struct ofnode_phandle_args args;
37 struct udevice *dev_mbox;
40 debug("%s(dev=%p, index=%d, chan=%p)\n", __func__, dev, index, chan);
42 ret = dev_read_phandle_with_args(dev, "mboxes", "#mbox-cells", 0, index,
45 debug("%s: dev_read_phandle_with_args failed: %d\n", __func__,
50 ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX, args.node, &dev_mbox);
52 debug("%s: uclass_get_device_by_of_offset failed: %d\n",
55 /* Test with parent node */
56 ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX,
57 ofnode_get_parent(args.node),
60 debug("%s: mbox node from parent failed: %d\n",
65 ops = mbox_dev_ops(dev_mbox);
69 ret = ops->of_xlate(chan, &args);
71 ret = mbox_of_xlate_default(chan, &args);
73 debug("of_xlate() failed: %d\n", ret);
78 ret = ops->request(chan);
80 debug("ops->request() failed: %d\n", ret);
87 int mbox_get_by_name(struct udevice *dev, const char *name,
88 struct mbox_chan *chan)
92 debug("%s(dev=%p, name=%s, chan=%p)\n", __func__, dev, name, chan);
94 index = dev_read_stringlist_search(dev, "mbox-names", name);
96 debug("fdt_stringlist_search() failed: %d\n", index);
100 return mbox_get_by_index(dev, index, chan);
103 int mbox_free(struct mbox_chan *chan)
105 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
107 debug("%s(chan=%p)\n", __func__, chan);
110 return ops->rfree(chan);
115 int mbox_send(struct mbox_chan *chan, const void *data)
117 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
119 debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
121 return ops->send(chan, data);
124 int mbox_recv(struct mbox_chan *chan, void *data, ulong timeout_us)
126 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
130 debug("%s(chan=%p, data=%p, timeout_us=%ld)\n", __func__, chan, data,
133 start_time = timer_get_us();
135 * Account for partial us ticks, but if timeout_us is 0, ensure we
136 * still don't wait at all.
142 ret = ops->recv(chan, data);
145 if ((timer_get_us() - start_time) >= timeout_us)
150 UCLASS_DRIVER(mailbox) = {
151 .id = UCLASS_MAILBOX,