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0d2e1a2926
Add the CAIF Virtio shared memory driver for talking to a modem. This CAIF Link layer communicates to the modem over shared memory. It is implemented as a virtio_driver. The underlying virtio device is managed by the remoteproc framework. The Virtio queue is used for transmitting data to the modem, and the new vringh is used for receiving data. Genalloc is used for managing the shared memory used for TX data. The default dma-alloc-coherent allocator can only allocate whole pages, and this wastes too much shared memory. Flow control is implemented by stopping the TX-queues if the virtio queues go full or we run out of memory. Queued are reopened when queues are below the watermark. NAPI is used in RX path, and a dedicated tasklet is used for releasing TX buffers. Signed-off-by: Erwan Yvin <erwan.yvin@stericsson.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor fixes)
25 lines
492 B
C
25 lines
492 B
C
/*
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* Copyright (C) ST-Ericsson AB 2012
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* Author: Sjur Brændeland <sjur.brandeland@stericsson.com>
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*
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* This header is BSD licensed so
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* anyone can use the definitions to implement compatible remote processors
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*/
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#ifndef VIRTIO_CAIF_H
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#define VIRTIO_CAIF_H
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#include <linux/types.h>
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struct virtio_caif_transf_config {
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u16 headroom;
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u16 tailroom;
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u32 mtu;
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u8 reserved[4];
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};
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struct virtio_caif_config {
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struct virtio_caif_transf_config uplink, downlink;
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u8 reserved[8];
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};
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#endif
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