sandbox-mbox.c 2.1 KB

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