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 <log.h>
  8. #include <mailbox-uclass.h>
  9. #include <malloc.h>
  10. #include <asm/io.h>
  11. #include <asm/mbox.h>
  12. #define SANDBOX_MBOX_CHANNELS 2
  13. struct sandbox_mbox_chan {
  14. bool rx_msg_valid;
  15. uint32_t rx_msg;
  16. };
  17. struct sandbox_mbox {
  18. struct sandbox_mbox_chan chans[SANDBOX_MBOX_CHANNELS];
  19. };
  20. static int sandbox_mbox_request(struct mbox_chan *chan)
  21. {
  22. debug("%s(chan=%p)\n", __func__, chan);
  23. if (chan->id >= SANDBOX_MBOX_CHANNELS)
  24. return -EINVAL;
  25. return 0;
  26. }
  27. static int sandbox_mbox_free(struct mbox_chan *chan)
  28. {
  29. debug("%s(chan=%p)\n", __func__, chan);
  30. return 0;
  31. }
  32. static int sandbox_mbox_send(struct mbox_chan *chan, const void *data)
  33. {
  34. struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
  35. const uint32_t *pmsg = data;
  36. debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
  37. sbm->chans[chan->id].rx_msg = *pmsg ^ SANDBOX_MBOX_PING_XOR;
  38. sbm->chans[chan->id].rx_msg_valid = true;
  39. return 0;
  40. }
  41. static int sandbox_mbox_recv(struct mbox_chan *chan, void *data)
  42. {
  43. struct sandbox_mbox *sbm = dev_get_priv(chan->dev);
  44. uint32_t *pmsg = data;
  45. debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
  46. if (!sbm->chans[chan->id].rx_msg_valid)
  47. return -ENODATA;
  48. *pmsg = sbm->chans[chan->id].rx_msg;
  49. sbm->chans[chan->id].rx_msg_valid = false;
  50. return 0;
  51. }
  52. static int sandbox_mbox_bind(struct udevice *dev)
  53. {
  54. debug("%s(dev=%p)\n", __func__, dev);
  55. return 0;
  56. }
  57. static int sandbox_mbox_probe(struct udevice *dev)
  58. {
  59. debug("%s(dev=%p)\n", __func__, dev);
  60. return 0;
  61. }
  62. static const struct udevice_id sandbox_mbox_ids[] = {
  63. { .compatible = "sandbox,mbox" },
  64. { }
  65. };
  66. struct mbox_ops sandbox_mbox_mbox_ops = {
  67. .request = sandbox_mbox_request,
  68. .rfree = sandbox_mbox_free,
  69. .send = sandbox_mbox_send,
  70. .recv = sandbox_mbox_recv,
  71. };
  72. U_BOOT_DRIVER(sandbox_mbox) = {
  73. .name = "sandbox_mbox",
  74. .id = UCLASS_MAILBOX,
  75. .of_match = sandbox_mbox_ids,
  76. .bind = sandbox_mbox_bind,
  77. .probe = sandbox_mbox_probe,
  78. .priv_auto_alloc_size = sizeof(struct sandbox_mbox),
  79. .ops = &sandbox_mbox_mbox_ops,
  80. };