LXR linux/drivers/staging/comedi/drivers/mite.h

   1/*
   2 * module/mite.h
   3 * Hardware driver for NI Mite PCI interface chip
   4 *
   5 * COMEDI - Linux Control and Measurement Device Interface
   6 * Copyright (C) 1999 David A. Schleef <ds@schleef.org>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 */
  18
  19#ifndef _MITE_H_
  20#define _MITE_H_
  21
  22#include <linux/spinlock.h>
  23
  24#define MAX_MITE_DMA_CHANNELS 8
  25
  26struct comedi_device;
  27struct comedi_subdevice;
  28struct device;
  29struct pci_dev;
  30
  31struct mite_dma_desc {
  32        __le32 count;
  33        __le32 addr;
  34        __le32 next;
  35        u32 dar;
  36};
  37
  38struct mite_ring {
  39        struct device *hw_dev;
  40        unsigned int n_links;
  41        struct mite_dma_desc *descs;
  42        dma_addr_t dma_addr;
  43};
  44
  45struct mite_channel {
  46        struct mite *mite;
  47        unsigned int channel;
  48        int dir;
  49        int done;
  50        struct mite_ring *ring;
  51};
  52
  53struct mite {
  54        struct pci_dev *pcidev;
  55        void __iomem *mmio;
  56        struct mite_channel channels[MAX_MITE_DMA_CHANNELS];
  57        int num_channels;
  58        unsigned int fifo_size;
  59        /* protects mite_channel from being released by the driver */
  60        spinlock_t lock;
  61};
  62
  63u32 mite_bytes_in_transit(struct mite_channel *);
  64
  65void mite_sync_dma(struct mite_channel *, struct comedi_subdevice *);
  66void mite_ack_linkc(struct mite_channel *, struct comedi_subdevice *s,
  67                    bool sync);
  68int mite_done(struct mite_channel *);
  69
  70void mite_dma_arm(struct mite_channel *);
  71void mite_dma_disarm(struct mite_channel *);
  72
  73void mite_prep_dma(struct mite_channel *,
  74                   unsigned int num_device_bits, unsigned int num_memory_bits);
  75
  76struct mite_channel *mite_request_channel_in_range(struct mite *,
  77                                                   struct mite_ring *,
  78                                                   unsigned int min_channel,
  79                                                   unsigned int max_channel);
  80struct mite_channel *mite_request_channel(struct mite *, struct mite_ring *);
  81void mite_release_channel(struct mite_channel *);
  82
  83int mite_init_ring_descriptors(struct mite_ring *, struct comedi_subdevice *,
  84                               unsigned int nbytes);
  85int mite_buf_change(struct mite_ring *, struct comedi_subdevice *);
  86
  87struct mite_ring *mite_alloc_ring(struct mite *);
  88void mite_free_ring(struct mite_ring *);
  89
  90struct mite *mite_attach(struct comedi_device *, bool use_win1);
  91void mite_detach(struct mite *);
  92
  93/*
  94 * Mite registers (used outside of the mite driver)
  95 */
  96#define MITE_IODWBSR            0xc0    /* IO Device Window Base Size */
  97#define MITE_IODWBSR_1          0xc4    /* IO Device Window1 Base Size */
  98#define WENAB                   BIT(7)  /* window enable */
  99#define MITE_IODWCR_1           0xf4
 100
 101#endif
 102