1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/mite.h b/drivers/comedi/drivers/mite.h
new file mode 100644
index 000000000..c6c056069
--- /dev/null
+++ b/drivers/comedi/drivers/mite.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * module/mite.h
+ * Hardware driver for NI Mite PCI interface chip
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1999 David A. Schleef <ds@schleef.org>
+ */
+
+#ifndef _MITE_H_
+#define _MITE_H_
+
+#include <linux/spinlock.h>
+
+#define MAX_MITE_DMA_CHANNELS 8
+
+struct comedi_device;
+struct comedi_subdevice;
+struct device;
+struct pci_dev;
+
+struct mite_dma_desc {
+	__le32 count;
+	__le32 addr;
+	__le32 next;
+	u32 dar;
+};
+
+struct mite_ring {
+	struct device *hw_dev;
+	unsigned int n_links;
+	struct mite_dma_desc *descs;
+	dma_addr_t dma_addr;
+};
+
+struct mite_channel {
+	struct mite *mite;
+	unsigned int channel;
+	int dir;
+	int done;
+	struct mite_ring *ring;
+};
+
+struct mite {
+	struct pci_dev *pcidev;
+	void __iomem *mmio;
+	struct mite_channel channels[MAX_MITE_DMA_CHANNELS];
+	int num_channels;
+	unsigned int fifo_size;
+	/* protects mite_channel from being released by the driver */
+	spinlock_t lock;
+};
+
+u32 mite_bytes_in_transit(struct mite_channel *mite_chan);
+
+void mite_sync_dma(struct mite_channel *mite_chan, struct comedi_subdevice *s);
+void mite_ack_linkc(struct mite_channel *mite_chan, struct comedi_subdevice *s,
+		    bool sync);
+int mite_done(struct mite_channel *mite_chan);
+
+void mite_dma_arm(struct mite_channel *mite_chan);
+void mite_dma_disarm(struct mite_channel *mite_chan);
+
+void mite_prep_dma(struct mite_channel *mite_chan,
+		   unsigned int num_device_bits, unsigned int num_memory_bits);
+
+struct mite_channel *mite_request_channel_in_range(struct mite *mite,
+						   struct mite_ring *ring,
+						   unsigned int min_channel,
+						   unsigned int max_channel);
+struct mite_channel *mite_request_channel(struct mite *mite,
+					  struct mite_ring *ring);
+void mite_release_channel(struct mite_channel *mite_chan);
+
+int mite_init_ring_descriptors(struct mite_ring *ring,
+			       struct comedi_subdevice *s, unsigned int nbytes);
+int mite_buf_change(struct mite_ring *ring, struct comedi_subdevice *s);
+
+struct mite_ring *mite_alloc_ring(struct mite *mite);
+void mite_free_ring(struct mite_ring *ring);
+
+struct mite *mite_attach(struct comedi_device *dev, bool use_win1);
+void mite_detach(struct mite *mite);
+
+/*
+ * Mite registers (used outside of the mite driver)
+ */
+#define MITE_IODWBSR		0xc0	/* IO Device Window Base Size */
+#define MITE_IODWBSR_1		0xc4	/* IO Device Window1 Base Size */
+#define WENAB			BIT(7)	/* window enable */
+#define MITE_IODWCR_1		0xf4
+
+#endif