1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * module/mite.h
4 * Hardware driver for NI Mite PCI interface chip
5 *
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 1999 David A. Schleef <ds@schleef.org>
8 */
9
10#ifndef _MITE_H_
11#define _MITE_H_
12
13#include <linux/spinlock.h>
14
15#define MAX_MITE_DMA_CHANNELS 8
16
17struct comedi_device;
18struct comedi_subdevice;
19struct device;
20struct pci_dev;
21
22struct mite_dma_desc {
23 __le32 count;
24 __le32 addr;
25 __le32 next;
26 u32 dar;
27};
28
29struct mite_ring {
30 struct device *hw_dev;
31 unsigned int n_links;
32 struct mite_dma_desc *descs;
33 dma_addr_t dma_addr;
34};
35
36struct mite_channel {
37 struct mite *mite;
38 unsigned int channel;
39 int dir;
40 int done;
41 struct mite_ring *ring;
42};
43
44struct mite {
45 struct pci_dev *pcidev;
46 void __iomem *mmio;
47 struct mite_channel channels[MAX_MITE_DMA_CHANNELS];
48 int num_channels;
49 unsigned int fifo_size;
50 /* protects mite_channel from being released by the driver */
51 spinlock_t lock;
52};
53
54u32 mite_bytes_in_transit(struct mite_channel *mite_chan);
55
56void mite_sync_dma(struct mite_channel *mite_chan, struct comedi_subdevice *s);
57void mite_ack_linkc(struct mite_channel *mite_chan, struct comedi_subdevice *s,
58 bool sync);
59int mite_done(struct mite_channel *mite_chan);
60
61void mite_dma_arm(struct mite_channel *mite_chan);
62void mite_dma_disarm(struct mite_channel *mite_chan);
63
64void mite_prep_dma(struct mite_channel *mite_chan,
65 unsigned int num_device_bits, unsigned int num_memory_bits);
66
67struct 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);
71struct mite_channel *mite_request_channel(struct mite *mite,
72 struct mite_ring *ring);
73void mite_release_channel(struct mite_channel *mite_chan);
74
75int mite_init_ring_descriptors(struct mite_ring *ring,
76 struct comedi_subdevice *s, unsigned int nbytes);
77int mite_buf_change(struct mite_ring *ring, struct comedi_subdevice *s);
78
79struct mite_ring *mite_alloc_ring(struct mite *mite);
80void mite_free_ring(struct mite_ring *ring);
81
82struct mite *mite_attach(struct comedi_device *dev, bool use_win1);
83void mite_detach(struct mite *mite);
84
85/*
86 * Mite registers (used outside of the mite driver)
87 */
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
92
93#endif
94

source code of linux/drivers/comedi/drivers/mite.h