drivers/soundwire/bus.h

   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 */