1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * PCC (Platform Communications Channel) methods 4 */ 5 6 #ifndef _PCC_H 7 #define _PCC_H 8 9 #include <linux/mailbox_controller.h> 10 #include <linux/mailbox_client.h> 11 12 struct pcc_mbox_chan { 13 struct mbox_chan *mchan; 14 u64 shmem_base_addr; 15 u64 shmem_size; 16 u32 latency; 17 u32 max_access_rate; 18 u16 min_turnaround_time; 19 }; 20 21 /* Generic Communications Channel Shared Memory Region */ 22 #define PCC_SIGNATURE 0x50434300 23 /* Generic Communications Channel Command Field */ 24 #define PCC_CMD_GENERATE_DB_INTR BIT(15) 25 /* Generic Communications Channel Status Field */ 26 #define PCC_STATUS_CMD_COMPLETE BIT(0) 27 #define PCC_STATUS_SCI_DOORBELL BIT(1) 28 #define PCC_STATUS_ERROR BIT(2) 29 #define PCC_STATUS_PLATFORM_NOTIFY BIT(3) 30 /* Initiator Responder Communications Channel Flags */ 31 #define PCC_CMD_COMPLETION_NOTIFY BIT(0) 32 33 #define MAX_PCC_SUBSPACES 256 34 35 #ifdef CONFIG_PCC 36 extern struct pcc_mbox_chan * 37 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id); 38 extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan); 39 #else 40 static inline struct pcc_mbox_chan * 41 pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id) 42 { 43 return ERR_PTR(-ENODEV); 44 } 45 static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { } 46 #endif 47 48 #endif /* _PCC_H */ 49