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