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/* 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 <>
#ifndef _MITE_H_
#define _MITE_H_
#include <linux/spinlock.h>
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