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https://github.com/brain-hackers/u-boot-brain
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05f683a3e2
The following patch allows the mailbox node in DT to host subnodes with mailbox definitions. If the client phandle to the mailbox is not the mailbox driver node, just checks parents as well. Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
152 lines
3.1 KiB
C
152 lines
3.1 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 <mailbox.h>
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#include <mailbox-uclass.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->free)
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return ops->free(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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