1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * Hardware driver for NI Mite PCI interface chip
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 1999 David A. Schleef <ds@schleef.org>
13 #include <linux/spinlock.h>
15 #define MAX_MITE_DMA_CHANNELS 8
18 struct comedi_subdevice;
22 struct mite_dma_desc {
30 struct device *hw_dev;
32 struct mite_dma_desc *descs;
41 struct mite_ring *ring;
45 struct pci_dev *pcidev;
47 struct mite_channel channels[MAX_MITE_DMA_CHANNELS];
49 unsigned int fifo_size;
50 /* protects mite_channel from being released by the driver */
54 u32 mite_bytes_in_transit(struct mite_channel *mite_chan);
56 void mite_sync_dma(struct mite_channel *mite_chan, struct comedi_subdevice *s);
57 void mite_ack_linkc(struct mite_channel *mite_chan, struct comedi_subdevice *s,
59 int mite_done(struct mite_channel *mite_chan);
61 void mite_dma_arm(struct mite_channel *mite_chan);
62 void mite_dma_disarm(struct mite_channel *mite_chan);
64 void mite_prep_dma(struct mite_channel *mite_chan,
65 unsigned int num_device_bits, unsigned int num_memory_bits);
67 struct mite_channel *mite_request_channel_in_range(struct mite *mite,
68 struct mite_ring *ring,
69 unsigned int min_channel,
70 unsigned int max_channel);
71 struct mite_channel *mite_request_channel(struct mite *mite,
72 struct mite_ring *ring);
73 void mite_release_channel(struct mite_channel *mite_chan);
75 int mite_init_ring_descriptors(struct mite_ring *ring,
76 struct comedi_subdevice *s, unsigned int nbytes);
77 int mite_buf_change(struct mite_ring *ring, struct comedi_subdevice *s);
79 struct mite_ring *mite_alloc_ring(struct mite *mite);
80 void mite_free_ring(struct mite_ring *ring);
82 struct mite *mite_attach(struct comedi_device *dev, bool use_win1);
83 void mite_detach(struct mite *mite);
86 * Mite registers (used outside of the mite driver)
88 #define MITE_IODWBSR 0xc0 /* IO Device Window Base Size */
89 #define MITE_IODWBSR_1 0xc4 /* IO Device Window1 Base Size */
90 #define WENAB BIT(7) /* window enable */
91 #define MITE_IODWCR_1 0xf4