(Patches split per file for review, will be a single commit alongside
SDIO ids once review is complete. See cover letter for more
information)

Signed-off-by: Lachlan Hodges <lachlan.hodges@morsemicro.com>
---
 drivers/net/wireless/morsemicro/mm81x/bus.h | 99 +++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 drivers/net/wireless/morsemicro/mm81x/bus.h

diff --git a/drivers/net/wireless/morsemicro/mm81x/bus.h b/drivers/net/wireless/morsemicro/mm81x/bus.h
new file mode 100644
index 000000000000..d2ccabc037fb
--- /dev/null
+++ b/drivers/net/wireless/morsemicro/mm81x/bus.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2017-2026 Morse Micro
+ */
+
+#ifndef _MM81X_BUS_H_
+#define _MM81X_BUS_H_
+
+#include <linux/skbuff.h>
+#include "core.h"
+
+enum mm81x_bus_type {
+	MM81X_BUS_TYPE_USB,
+	MM81X_BUS_TYPE_SDIO,
+};
+
+struct mm81x_bus_ops {
+	int (*dm_read)(struct mm81x *mors, u32 addr, u8 *data, int len);
+	int (*dm_write)(struct mm81x *mors, u32 addr, const u8 *data, int len);
+	int (*reg32_read)(struct mm81x *mors, u32 addr, u32 *data);
+	int (*reg32_write)(struct mm81x *mors, u32 addr, u32 data);
+	int (*digital_reset)(struct mm81x *mors);
+	void (*set_bus_enable)(struct mm81x *mors, bool enable);
+	void (*config_burst_mode)(struct mm81x *mors, bool enable_burst);
+	void (*claim)(struct mm81x *mors);
+	void (*set_irq)(struct mm81x *mors, bool enable);
+	void (*release)(struct mm81x *mors);
+	unsigned int bulk_alignment;
+};
+
+/*
+ * Default TX alignment for buses which don't care. mac80211 will give us
+ * SKBs aligned to the 2 byte boundary, so 2 is effectively a noop.
+ */
+#define MM81X_BUS_DEFAULT_BULK_ALIGNMENT (2)
+
+/* mm81x_dm_read - len must be rounded up to the nearest 4-byte boundary */
+static inline int mm81x_dm_read(struct mm81x *mors, u32 addr, u8 *data, int len)
+{
+	return mors->bus_ops->dm_read(mors, addr, data, len);
+}
+
+static inline int mm81x_dm_write(struct mm81x *mors, u32 addr, const u8 *data,
+				 int len)
+{
+	return mors->bus_ops->dm_write(mors, addr, data, len);
+}
+
+static inline int mm81x_reg32_read(struct mm81x *mors, u32 addr, u32 *data)
+{
+	return mors->bus_ops->reg32_read(mors, addr, data);
+}
+
+static inline int mm81x_reg32_write(struct mm81x *mors, u32 addr, u32 data)
+{
+	return mors->bus_ops->reg32_write(mors, addr, data);
+}
+
+static inline int mm81x_bus_digital_reset(struct mm81x *mors)
+{
+	if (mors->bus_ops->digital_reset)
+		return mors->bus_ops->digital_reset(mors);
+
+	return 0;
+}
+
+static inline void mm81x_set_bus_enable(struct mm81x *mors, bool enable)
+{
+	mors->bus_ops->set_bus_enable(mors, enable);
+}
+
+static inline void mm81x_bus_config_burst_mode(struct mm81x *mors,
+					       bool enable_burst)
+{
+	if (mors->bus_ops->config_burst_mode)
+		mors->bus_ops->config_burst_mode(mors, enable_burst);
+}
+
+static inline void mm81x_claim_bus(struct mm81x *mors)
+{
+	mors->bus_ops->claim(mors);
+}
+
+static inline void mm81x_bus_set_irq(struct mm81x *mors, bool enable)
+{
+	mors->bus_ops->set_irq(mors, enable);
+}
+
+static inline void mm81x_release_bus(struct mm81x *mors)
+{
+	mors->bus_ops->release(mors);
+}
+
+static inline unsigned int mm81x_bus_get_alignment(struct mm81x *mors)
+{
+	return mors->bus_ops->bulk_alignment;
+}
+
+#endif /* !_MM81X_BUS_H_ */
-- 
2.43.0