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