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114 lines
3.1 KiB
114 lines
3.1 KiB
/* |
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* Thunderbolt Cactus Ridge driver - NHI driver |
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* |
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> |
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*/ |
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#ifndef DSL3510_H_ |
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#define DSL3510_H_ |
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#include <linux/mutex.h> |
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#include <linux/workqueue.h> |
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/** |
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* struct tb_nhi - thunderbolt native host interface |
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*/ |
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struct tb_nhi { |
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struct mutex lock; /* |
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* Must be held during ring creation/destruction. |
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* Is acquired by interrupt_work when dispatching |
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* interrupts to individual rings. |
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**/ |
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struct pci_dev *pdev; |
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void __iomem *iobase; |
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struct tb_ring **tx_rings; |
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struct tb_ring **rx_rings; |
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struct work_struct interrupt_work; |
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u32 hop_count; /* Number of rings (end point hops) supported by NHI. */ |
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}; |
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/** |
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* struct tb_ring - thunderbolt TX or RX ring associated with a NHI |
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*/ |
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struct tb_ring { |
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struct mutex lock; /* must be acquired after nhi->lock */ |
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struct tb_nhi *nhi; |
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int size; |
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int hop; |
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int head; /* write next descriptor here */ |
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int tail; /* complete next descriptor here */ |
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struct ring_desc *descriptors; |
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dma_addr_t descriptors_dma; |
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struct list_head queue; |
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struct list_head in_flight; |
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struct work_struct work; |
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bool is_tx:1; /* rx otherwise */ |
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bool running:1; |
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}; |
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struct ring_frame; |
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typedef void (*ring_cb)(struct tb_ring*, struct ring_frame*, bool canceled); |
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/** |
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* struct ring_frame - for use with ring_rx/ring_tx |
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*/ |
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struct ring_frame { |
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dma_addr_t buffer_phy; |
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ring_cb callback; |
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struct list_head list; |
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u32 size:12; /* TX: in, RX: out*/ |
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u32 flags:12; /* RX: out */ |
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u32 eof:4; /* TX:in, RX: out */ |
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u32 sof:4; /* TX:in, RX: out */ |
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}; |
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#define TB_FRAME_SIZE 0x100 /* minimum size for ring_rx */ |
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struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size); |
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struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size); |
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void ring_start(struct tb_ring *ring); |
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void ring_stop(struct tb_ring *ring); |
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void ring_free(struct tb_ring *ring); |
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int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame); |
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/** |
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* ring_rx() - enqueue a frame on an RX ring |
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* |
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* frame->buffer, frame->buffer_phy and frame->callback have to be set. The |
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* buffer must contain at least TB_FRAME_SIZE bytes. |
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* |
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* frame->callback will be invoked with frame->size, frame->flags, frame->eof, |
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* frame->sof set once the frame has been received. |
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* |
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* If ring_stop is called after the packet has been enqueued frame->callback |
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* will be called with canceled set to true. |
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* |
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* Return: Returns ESHUTDOWN if ring_stop has been called. Zero otherwise. |
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*/ |
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static inline int ring_rx(struct tb_ring *ring, struct ring_frame *frame) |
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{ |
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WARN_ON(ring->is_tx); |
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return __ring_enqueue(ring, frame); |
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} |
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/** |
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* ring_tx() - enqueue a frame on an TX ring |
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* |
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* frame->buffer, frame->buffer_phy, frame->callback, frame->size, frame->eof |
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* and frame->sof have to be set. |
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* |
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* frame->callback will be invoked with once the frame has been transmitted. |
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* |
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* If ring_stop is called after the packet has been enqueued frame->callback |
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* will be called with canceled set to true. |
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* |
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* Return: Returns ESHUTDOWN if ring_stop has been called. Zero otherwise. |
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*/ |
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static inline int ring_tx(struct tb_ring *ring, struct ring_frame *frame) |
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{ |
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WARN_ON(!ring->is_tx); |
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return __ring_enqueue(ring, frame); |
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} |
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#endif
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