mailbox: implement a sandbox test
This adds a sandbox mailbox implementation (provider), a test client
device, instantiates them both from Sandbox's DT, and adds a DM test
that excercises everything.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org> # v1
diff --git a/drivers/mailbox/sandbox-mbox.c b/drivers/mailbox/sandbox-mbox.c
new file mode 100644
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,
+};