1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 // Copyright(c) 2015-17 Intel Corporation. 3 4 #ifndef __SDW_BUS_H 5 #define __SDW_BUS_H 6 7 #if IS_ENABLED(CONFIG_ACPI) 8 int sdw_acpi_find_slaves(struct sdw_bus *bus); 9 #else 10 static inline int sdw_acpi_find_slaves(struct sdw_bus *bus) 11 { 12 return -ENOTSUPP; 13 } 14 #endif 15 16 void sdw_extract_slave_id(struct sdw_bus *bus, 17 u64 addr, struct sdw_slave_id *id); 18 19 enum { 20 SDW_MSG_FLAG_READ = 0, 21 SDW_MSG_FLAG_WRITE, 22 }; 23 24 /** 25 * struct sdw_msg - Message structure 26 * @addr: Register address accessed in the Slave 27 * @len: number of messages 28 * @dev_num: Slave device number 29 * @addr_page1: SCP address page 1 Slave register 30 * @addr_page2: SCP address page 2 Slave register 31 * @flags: transfer flags, indicate if xfer is read or write 32 * @buf: message data buffer 33 * @ssp_sync: Send message at SSP (Stream Synchronization Point) 34 * @page: address requires paging 35 */ 36 struct sdw_msg { 37 u16 addr; 38 u16 len; 39 u8 dev_num; 40 u8 addr_page1; 41 u8 addr_page2; 42 u8 flags; 43 u8 *buf; 44 bool ssp_sync; 45 bool page; 46 }; 47 48 int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg); 49 int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg, 50 struct sdw_defer *defer); 51 52 #define SDW_READ_INTR_CLEAR_RETRY 10 53 54 int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, 55 u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf); 56 57 /* Read-Modify-Write Slave register */ 58 static inline int 59 sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) 60 { 61 int tmp; 62 63 tmp = sdw_read(slave, addr); 64 if (tmp < 0) 65 return tmp; 66 67 tmp = (tmp & ~mask) | val; 68 return sdw_write(slave, addr, tmp); 69 } 70 71 #endif /* __SDW_BUS_H */ 72