source: soft/giet_vm/giet_drivers/cma_driver.h @ 445

Last change on this file since 445 was 437, checked in by alain, 10 years ago

Introducing dynamic allocation of peripheral channel(TTY, NIC, TIM, CMA)
Removint the ICU driver : ICU component not supported anymore.
Removing the FBF driver.

File size: 3.6 KB
Line 
1///////////////////////////////////////////////////////////////////////////////////
2// File     : cma_driver.h
3// Date     : 01/11/2013
4// Author   : alain greiner
5// Copyright (c) UPMC-LIP6
6///////////////////////////////////////////////////////////////////////////////////
7// The cma_driver.c and cma_driver.h files are part ot the GIET-VM kernel.
8// This driver supports the SocLib vci_chbuf_dma component, that is
9// a multi channels, chained buffer DMA controller.
10//
11// This component can be used in conjonction with the SocLib vci_frame_buffer
12// to display images, or with the SocLib vci_multi_nic controller to tranfer
13// RX or TX packets between NIC and memory buffers.
14//
15// The SEG_CMA_BASE address must be defined in the hard_config.h file
16//
17// All accesses to CMA registers are done by the two _cma_set_register()
18// and _cma_get_register() low-level functions, that are handling virtual
19// to physical extended addressing.
20//
21// The higher level access functions are defined in the fbf_driver
22// and nic_driver files.
23///////////////////////////////////////////////////////////////////////////////////
24
25#ifndef _GIET_CMA_DRIVERS_H_
26#define _GIET_CMA_DRIVERS_H_
27
28///////////////////////////////////////////////////////////////////////////////////
29//  registers offsets
30///////////////////////////////////////////////////////////////////////////////////
31
32enum CMA_registers
33{
34    CHBUF_RUN           = 0,    // write-only : channel activated
35    CHBUF_STATUS        = 1,    // read-only  : channel fsm state
36    CHBUF_SRC_DESC      = 2,    // read/write : source chbuf : descriptor base address
37    CHBUF_DST_DESC      = 3,    // read/write : destination chbuf : descriptor base address,
38    CHBUF_SRC_NBUFS     = 4,    // read/write : source chbuf : number of buffers,
39    CHBUF_DST_NBUFS     = 5,    // read/write : destination chbuf : number of buffers,
40    CHBUF_BUF_SIZE      = 6,    // read/write : buffer size for both source & destination 
41    CHBUF_PERIOD        = 7,    // read/write : period for status polling
42    CHBUF_SRC_EXT       = 8,    // read/write : source chbuf : descriptor base address
43    CHBUF_DST_EXT       = 9,    // read/write : destination chbuf : descriptor base address,
44    /****/
45    CHBUF_CHANNEL_SPAN  = 1024,
46};
47
48///////////////////////////////////////////////////////////////////////////////////
49//    access functions
50///////////////////////////////////////////////////////////////////////////////////
51
52////////////////////////////////////////////////////////////
53extern unsigned int _cma_get_register( unsigned int channel,
54                                       unsigned int index );
55
56///////////////////////////////////////////////////
57extern void _cma_set_register( unsigned int channel,
58                               unsigned int index,
59                               unsigned int value );
60
61///////////////////////////////////////////////////
62void _cma_start_channel( unsigned int       channel,
63                         unsigned long long src_paddr,
64                         unsigned int       src_nbufs,
65                         unsigned long long dst_paddr,
66                         unsigned int       dst_nbufs,
67                         unsigned int       buf_length );
68
69//////////////////////////////////////////////
70void _cma_stop_channel( unsigned int channel );
71
72////////////////////////////////////////////
73extern void _cma_isr( unsigned int irq_type,
74                      unsigned int irq_id,
75                      unsigned int channel );
76
77#endif
78
79// Local Variables:
80// tab-width: 4
81// c-basic-offset: 4
82// c-file-offsets:((innamespace . 0)(inline-open . 0))
83// indent-tabs-mode: nil
84// End:
85// vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
86
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