| // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
| // Copyright(c) 2015-17 Intel Corporation. |
| |
| #ifndef __SDW_BUS_H |
| #define __SDW_BUS_H |
| |
| #if IS_ENABLED(CONFIG_ACPI) |
| int sdw_acpi_find_slaves(struct sdw_bus *bus); |
| #else |
| static inline int sdw_acpi_find_slaves(struct sdw_bus *bus) |
| { |
| return -ENOTSUPP; |
| } |
| #endif |
| |
| void sdw_extract_slave_id(struct sdw_bus *bus, |
| u64 addr, struct sdw_slave_id *id); |
| |
| enum { |
| SDW_MSG_FLAG_READ = 0, |
| SDW_MSG_FLAG_WRITE, |
| }; |
| |
| /** |
| * struct sdw_msg - Message structure |
| * @addr: Register address accessed in the Slave |
| * @len: number of messages |
| * @dev_num: Slave device number |
| * @addr_page1: SCP address page 1 Slave register |
| * @addr_page2: SCP address page 2 Slave register |
| * @flags: transfer flags, indicate if xfer is read or write |
| * @buf: message data buffer |
| * @ssp_sync: Send message at SSP (Stream Synchronization Point) |
| * @page: address requires paging |
| */ |
| struct sdw_msg { |
| u16 addr; |
| u16 len; |
| u8 dev_num; |
| u8 addr_page1; |
| u8 addr_page2; |
| u8 flags; |
| u8 *buf; |
| bool ssp_sync; |
| bool page; |
| }; |
| |
| int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg); |
| int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg, |
| struct sdw_defer *defer); |
| |
| #define SDW_READ_INTR_CLEAR_RETRY 10 |
| |
| int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, |
| u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf); |
| |
| /* Read-Modify-Write Slave register */ |
| static inline int |
| sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) |
| { |
| int tmp; |
| |
| tmp = sdw_read(slave, addr); |
| if (tmp < 0) |
| return tmp; |
| |
| tmp = (tmp & ~mask) | val; |
| return sdw_write(slave, addr, tmp); |
| } |
| |
| #endif /* __SDW_BUS_H */ |