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ARK-OS
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arkos
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kernel
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include
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acpi
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pcc.h

pcc.h 1.3 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  * PCC (Platform Communications Channel) methods
    4. 

  4.  */
    5. 

  5. 

  6. #ifndef _PCC_H
    7. 

  7. #define _PCC_H
    8. 

  8. 

  9. #include <linux/mailbox_controller.h>
    10. 

  10. #include <linux/mailbox_client.h>
    11. 

  11. 

  12. struct pcc_mbox_chan {
    13. 

  13. 	struct mbox_chan *mchan;
    14. 

  14. 	u64 shmem_base_addr;
    15. 

  15. 	void __iomem *shmem;
    16. 

  16. 	u64 shmem_size;
    17. 

  17. 	u32 latency;
    18. 

  18. 	u32 max_access_rate;
    19. 

  19. 	u16 min_turnaround_time;
    20. 

  20. };
    21. 

  21. 

  22. /* Generic Communications Channel Shared Memory Region */
    23. 

  23. #define PCC_SIGNATURE			0x50434300
    24. 

  24. /* Generic Communications Channel Command Field */
    25. 

  25. #define PCC_CMD_GENERATE_DB_INTR	BIT(15)
    26. 

  26. /* Generic Communications Channel Status Field */
    27. 

  27. #define PCC_STATUS_CMD_COMPLETE		BIT(0)
    28. 

  28. #define PCC_STATUS_SCI_DOORBELL		BIT(1)
    29. 

  29. #define PCC_STATUS_ERROR		BIT(2)
    30. 

  30. #define PCC_STATUS_PLATFORM_NOTIFY	BIT(3)
    31. 

  31. /* Initiator Responder Communications Channel Flags */
    32. 

  32. #define PCC_CMD_COMPLETION_NOTIFY	BIT(0)
    33. 

  33. 

  34. #define MAX_PCC_SUBSPACES	256
    35. 

  35. 

  36. #ifdef CONFIG_PCC
    37. 

  37. extern struct pcc_mbox_chan *
    38. 

  38. pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
    39. 

  39. extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan);
    40. 

  40. #else
    41. 

  41. static inline struct pcc_mbox_chan *
    42. 

  42. pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id)
    43. 

  43. {
    44. 

  44. 	return ERR_PTR(-ENODEV);
    45. 

  45. }
    46. 

  46. static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { }
    47. 

  47. #endif
    48. 

  48. 

  49. #endif /* _PCC_H */
    50.