projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 8961b524 SW |
2 | /* |
| 3 | * Copyright (c) 2016, NVIDIA CORPORATION. | |
| 8961b524 SW |
4 | */ |
| 5 | ||
| 6 | #include <common.h> | |
| 7 | #include <dm.h> | |
| f7ae49fc | 8 | #include <log.h> |
| 769d52ef | 9 | #include <mailbox-uclass.h> |
| 336d4615 | 10 | #include <malloc.h> |
| 8961b524 SW |
11 | #include <asm/io.h> |
| 12 | #include <asm/mbox.h> | |
| 13 | ||
| 14 | #define SANDBOX_MBOX_CHANNELS 2 | |
| 15 | ||
| 16 | struct sandbox_mbox_chan { | |
| 17 | bool rx_msg_valid; | |
| 18 | uint32_t rx_msg; | |
| 19 | }; | |
| 20 | ||
| 21 | struct sandbox_mbox { | |
| 22 | struct sandbox_mbox_chan chans[SANDBOX_MBOX_CHANNELS]; | |
| 23 | }; | |
| 24 | ||
| 25 | static int sandbox_mbox_request(struct mbox_chan *chan) | |
| 26 | { | |
| 27 | debug("%s(chan=%p)\n", __func__, chan); | |
| 28 | ||
| 29 | if (chan->id >= SANDBOX_MBOX_CHANNELS) | |
| 30 | return -EINVAL; | |
| 31 | ||
| 32 | return 0; | |
| 33 | } | |
| 34 | ||
| 35 | static int sandbox_mbox_free(struct mbox_chan *chan) | |
| 36 | { | |
| 37 | debug("%s(chan=%p)\n", __func__, chan); | |
| 38 | ||
| 39 | return 0; | |
| 40 | } | |
| 41 | ||
| 42 | static int sandbox_mbox_send(struct mbox_chan *chan, const void *data) | |
| 43 | { | |
| 44 | struct sandbox_mbox *sbm = dev_get_priv(chan->dev); | |
| 45 | const uint32_t *pmsg = data; | |
| 46 | ||
| 47 | debug("%s(chan=%p, data=%p)\n", __func__, chan, data); | |
| 48 | ||
| 49 | sbm->chans[chan->id].rx_msg = *pmsg ^ SANDBOX_MBOX_PING_XOR; | |
| 50 | sbm->chans[chan->id].rx_msg_valid = true; | |
| 51 | ||
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static int sandbox_mbox_recv(struct mbox_chan *chan, void *data) | |
| 56 | { | |
| 57 | struct sandbox_mbox *sbm = dev_get_priv(chan->dev); | |
| 58 | uint32_t *pmsg = data; | |
| 59 | ||
| 60 | debug("%s(chan=%p, data=%p)\n", __func__, chan, data); | |
| 61 | ||
| 62 | if (!sbm->chans[chan->id].rx_msg_valid) | |
| 63 | return -ENODATA; | |
| 64 | ||
| 65 | *pmsg = sbm->chans[chan->id].rx_msg; | |
| 66 | sbm->chans[chan->id].rx_msg_valid = false; | |
| 67 | ||
| 68 | return 0; | |
| 69 | } | |
| 70 | ||
| 71 | static int sandbox_mbox_bind(struct udevice *dev) | |
| 72 | { | |
| 73 | debug("%s(dev=%p)\n", __func__, dev); | |
| 74 | ||
| 75 | return 0; | |
| 76 | } | |
| 77 | ||
| 78 | static int sandbox_mbox_probe(struct udevice *dev) | |
| 79 | { | |
| 80 | debug("%s(dev=%p)\n", __func__, dev); | |
| 81 | ||
| 82 | return 0; | |
| 83 | } | |
| 84 | ||
| 85 | static const struct udevice_id sandbox_mbox_ids[] = { | |
| 86 | { .compatible = "sandbox,mbox" }, | |
| 87 | { } | |
| 88 | }; | |
| 89 | ||
| 90 | struct mbox_ops sandbox_mbox_mbox_ops = { | |
| 91 | .request = sandbox_mbox_request, | |
| cc92c3cc | 92 | .rfree = sandbox_mbox_free, |
| 8961b524 SW |
93 | .send = sandbox_mbox_send, |
| 94 | .recv = sandbox_mbox_recv, | |
| 95 | }; | |
| 96 | ||
| 97 | U_BOOT_DRIVER(sandbox_mbox) = { | |
| 98 | .name = "sandbox_mbox", | |
| 99 | .id = UCLASS_MAILBOX, | |
| 100 | .of_match = sandbox_mbox_ids, | |
| 101 | .bind = sandbox_mbox_bind, | |
| 102 | .probe = sandbox_mbox_probe, | |
| 41575d8e | 103 | .priv_auto = sizeof(struct sandbox_mbox), |
| 8961b524 SW |
104 | .ops = &sandbox_mbox_mbox_ops, |
| 105 | }; |