root/drivers/staging/comedi/drivers/mite.h

INCLUDED FROM

   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 
  17 struct comedi_device;
  18 struct comedi_subdevice;
  19 struct device;
  20 struct pci_dev;
  21 
  22 struct mite_dma_desc {
  23         __le32 count;
  24         __le32 addr;
  25         __le32 next;
  26         u32 dar;
  27 };
  28 
  29 struct 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 
  36 struct mite_channel {
  37         struct mite *mite;
  38         unsigned int channel;
  39         int dir;
  40         int done;
  41         struct mite_ring *ring;
  42 };
  43 
  44 struct 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 
  54 u32 mite_bytes_in_transit(struct mite_channel *mite_chan);
  55 
  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,
  58                     bool sync);
  59 int mite_done(struct mite_channel *mite_chan);
  60 
  61 void mite_dma_arm(struct mite_channel *mite_chan);
  62 void mite_dma_disarm(struct mite_channel *mite_chan);
  63 
  64 void mite_prep_dma(struct mite_channel *mite_chan,
  65                    unsigned int num_device_bits, unsigned int num_memory_bits);
  66 
  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);
  74 
  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);
  78 
  79 struct mite_ring *mite_alloc_ring(struct mite *mite);
  80 void mite_free_ring(struct mite_ring *ring);
  81 
  82 struct mite *mite_attach(struct comedi_device *dev, bool use_win1);
  83 void 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