1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h
new file mode 100644
index 000000000000..345c34d697e9
--- /dev/null
+++ b/drivers/soundwire/bus.h
@@ -0,0 +1,71 @@
+// 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 */