mailbox: implement a sandbox test

[u-boot] / drivers / mailbox / sandbox-mbox.c

diff --git a/drivers/mailbox/sandbox-mbox.c b/drivers/mailbox/sandbox-mbox.c
new file mode 100644 (file)
index 0000000..1b7ac23
--- /dev/null
+++ b/drivers/mailbox/sandbox-mbox.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <mailbox_uclass.h>
+#include <asm/io.h>
+#include <asm/mbox.h>
+
+#define SANDBOX_MBOX_CHANNELS 2
+
+struct sandbox_mbox_chan {
+       bool rx_msg_valid;
+       uint32_t rx_msg;
+};
+
+struct sandbox_mbox {
+       struct sandbox_mbox_chan chans[SANDBOX_MBOX_CHANNELS];
+};
+
+static int sandbox_mbox_request(struct mbox_chan *chan)
+{
+       debug("%s(chan=%p)\n", __func__, chan);
+
+       if (chan->id >= SANDBOX_MBOX_CHANNELS)
+               return -EINVAL;
+
+       return 0;
+}
+
+static int sandbox_mbox_free(struct mbox_chan *chan)
+{
+       debug("%s(chan=%p)\n", __func__, chan);
+
+       return 0;
+}
+
+static int sandbox_mbox_send(struct mbox_chan *chan, const void *data)
+{
+       struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
+       const uint32_t *pmsg = data;
+
+       debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
+
+       sbm->chans[chan->id].rx_msg = *pmsg ^ SANDBOX_MBOX_PING_XOR;
+       sbm->chans[chan->id].rx_msg_valid = true;
+
+       return 0;
+}
+
+static int sandbox_mbox_recv(struct mbox_chan *chan, void *data)
+{
+       struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
+       uint32_t *pmsg = data;
+
+       debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
+
+       if (!sbm->chans[chan->id].rx_msg_valid)
+               return -ENODATA;
+
+       *pmsg = sbm->chans[chan->id].rx_msg;
+       sbm->chans[chan->id].rx_msg_valid = false;
+
+       return 0;
+}
+
+static int sandbox_mbox_bind(struct udevice *dev)
+{
+       debug("%s(dev=%p)\n", __func__, dev);
+
+       return 0;
+}
+
+static int sandbox_mbox_probe(struct udevice *dev)
+{
+       debug("%s(dev=%p)\n", __func__, dev);
+
+       return 0;
+}
+
+static const struct udevice_id sandbox_mbox_ids[] = {
+       { .compatible = "sandbox,mbox" },
+       { }
+};
+
+struct mbox_ops sandbox_mbox_mbox_ops = {
+       .request = sandbox_mbox_request,
+       .free = sandbox_mbox_free,
+       .send = sandbox_mbox_send,
+       .recv = sandbox_mbox_recv,
+};
+
+U_BOOT_DRIVER(sandbox_mbox) = {
+       .name = "sandbox_mbox",
+       .id = UCLASS_MAILBOX,
+       .of_match = sandbox_mbox_ids,
+       .bind = sandbox_mbox_bind,
+       .probe = sandbox_mbox_probe,
+       .priv_auto_alloc_size = sizeof(struct sandbox_mbox),
+       .ops = &sandbox_mbox_mbox_ops,
+};