mirror of
https://github.com/AsahiLinux/u-boot
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154 lines
3.2 KiB
C
154 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <mailbox.h>
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#include <mailbox-uclass.h>
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#include <malloc.h>
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#include <time.h>
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static inline struct mbox_ops *mbox_dev_ops(struct udevice *dev)
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{
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return (struct mbox_ops *)dev->driver->ops;
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}
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static int mbox_of_xlate_default(struct mbox_chan *chan,
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struct ofnode_phandle_args *args)
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{
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debug("%s(chan=%p)\n", __func__, chan);
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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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chan->id = args->args[0];
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return 0;
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}
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int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan)
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{
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struct ofnode_phandle_args args;
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int ret;
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struct udevice *dev_mbox;
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struct mbox_ops *ops;
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debug("%s(dev=%p, index=%d, chan=%p)\n", __func__, dev, index, chan);
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ret = dev_read_phandle_with_args(dev, "mboxes", "#mbox-cells", 0, index,
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&args);
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if (ret) {
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debug("%s: dev_read_phandle_with_args failed: %d\n", __func__,
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ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX, args.node, &dev_mbox);
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if (ret) {
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debug("%s: uclass_get_device_by_of_offset failed: %d\n",
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__func__, ret);
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/* Test with parent node */
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ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX,
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ofnode_get_parent(args.node),
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&dev_mbox);
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if (ret) {
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debug("%s: mbox node from parent failed: %d\n",
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__func__, ret);
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return ret;
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};
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}
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ops = mbox_dev_ops(dev_mbox);
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chan->dev = dev_mbox;
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if (ops->of_xlate)
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ret = ops->of_xlate(chan, &args);
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else
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ret = mbox_of_xlate_default(chan, &args);
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if (ret) {
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debug("of_xlate() failed: %d\n", ret);
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return ret;
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}
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if (ops->request)
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ret = ops->request(chan);
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if (ret) {
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debug("ops->request() failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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int mbox_get_by_name(struct udevice *dev, const char *name,
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struct mbox_chan *chan)
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{
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int index;
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debug("%s(dev=%p, name=%s, chan=%p)\n", __func__, dev, name, chan);
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index = dev_read_stringlist_search(dev, "mbox-names", name);
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if (index < 0) {
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debug("fdt_stringlist_search() failed: %d\n", index);
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return index;
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}
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return mbox_get_by_index(dev, index, chan);
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}
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int mbox_free(struct mbox_chan *chan)
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{
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struct mbox_ops *ops = mbox_dev_ops(chan->dev);
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debug("%s(chan=%p)\n", __func__, chan);
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if (ops->rfree)
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return ops->rfree(chan);
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return 0;
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}
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int mbox_send(struct mbox_chan *chan, const void *data)
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{
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struct mbox_ops *ops = mbox_dev_ops(chan->dev);
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debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
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return ops->send(chan, data);
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}
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int mbox_recv(struct mbox_chan *chan, void *data, ulong timeout_us)
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{
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struct mbox_ops *ops = mbox_dev_ops(chan->dev);
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ulong start_time;
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int ret;
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debug("%s(chan=%p, data=%p, timeout_us=%ld)\n", __func__, chan, data,
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timeout_us);
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start_time = timer_get_us();
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/*
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* Account for partial us ticks, but if timeout_us is 0, ensure we
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* still don't wait at all.
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*/
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if (timeout_us)
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timeout_us++;
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for (;;) {
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ret = ops->recv(chan, data);
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if (ret != -ENODATA)
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return ret;
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if ((timer_get_us() - start_time) >= timeout_us)
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return -ETIMEDOUT;
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}
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}
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UCLASS_DRIVER(mailbox) = {
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.id = UCLASS_MAILBOX,
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.name = "mailbox",
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};
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