source: trunk/kernel/devices/dev_iob.h @ 565

Last change on this file since 565 was 565, checked in by alain, 3 years ago

Complete restructuration of kernel locks.

File size: 6.3 KB
Line 
1/*
2 * dev_iob.h - IOB (bridge to external I/O) generic device API.
3 *
4 * Authors   Alain Greiner  (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTIOBLAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef _DEV_IOB_H_
25#define _DEV_IOB_H_
26
27#include <kernel_config.h>
28#include <hal_kernel_types.h>
29
30/*****************************************************************************************
31 *     Generic IOB (bridge to external IO peripherals) definition.
32 *
33 * The IOB device is used to access external peripherals. It implements an IO-MMU service
34 * for DMA transactions launched by DMA capable external peripherals.
35 *
36 * This IOB peripheral is acting as a dynamically configurable bridge, used for others
37 * I/O operations. Therefore, ALMOS-MKH does not use the IOB device waiting queue,
38 * and calls directly the IOB driver blocking functions, using the device lock to
39 * get exclusive access to the IOB bridge internal state.
40 ****************************************************************************************/
41 
42/****  Forward declarations  ****/
43
44struct chdev_s;
45
46/*****************************************************************************************
47 * This defines the specific extension for the IOB chdev descriptor.
48 ****************************************************************************************/
49
50typedef void     (iob_set_active_t) ( xptr_t iob_xp, uint32_t value );
51typedef void     (iob_set_ptpr_t)   ( xptr_t iob_xp, uint32_t value );
52typedef void     (iob_inval_page_t) ( xptr_t iob_xp, vpn_t vpn );
53typedef uint32_t (iob_get_bvar_t)   ( xptr_t iob_xp );
54typedef uint32_t (iob_get_srcid_t)  ( xptr_t iob_xp );
55typedef uint32_t (iob_get_error_t)  ( xptr_t iob_xp );
56
57typedef struct iob_extend_s
58{
59    iob_set_active_t  * set_active;
60    iob_set_ptpr_t    * set_ptpr;
61    iob_inval_page_t  * inval_page;
62    iob_get_bvar_t    * get_bvar;
63    iob_get_srcid_t   * get_srcid;
64    iob_get_error_t   * get_error;
65}
66iob_extend_t;
67
68/*****************************************************************************************
69 * This enum defines the various implementations of the IOB generic device.
70 * This array must be kept consistent with the define in arch_info.h file
71 ****************************************************************************************/
72
73enum iob_impl_e
74{
75    IMPL_IOB_TSR =   0,         /* vci_iob component used in TSAR                       */
76    IMPL_IOB_I86 =   1,         /* TBD                                                  */
77}
78iob_impl_t;
79
80/*****************************************************************************************
81 * This function initializes the IOB device descriptor with IOMMU disabled.
82 *****************************************************************************************
83 * @ chdev      :  pointer on IOB chdev descriptor.
84 ****************************************************************************************/
85void dev_iob_init( struct chdev_s * chdev );
86
87/*****************************************************************************************
88 * This function activates the IOMMU for the IOB device identified by its
89 * extended pointer.
90 *****************************************************************************************
91 * @ dev_xp   : extended pointer on IOB device descriptor.
92 ****************************************************************************************/
93void dev_iob_iommu_enable( xptr_t dev_xp );
94
95/*****************************************************************************************
96 * This function desactivates the IO-MMU for the IOB device identified by its
97 * extended pointer.
98 *****************************************************************************************
99 * @ dev_xp   : extended pointer on IOB device descriptor.
100 ****************************************************************************************/
101void dev_iob_iommu_disable( xptr_t dev_xp );
102
103/*****************************************************************************************
104 * This function set a new value in the IO-MMU PTPR register.
105 *****************************************************************************************
106 * @ dev_xp   : extended pointer on IOB device descriptor.
107 * @ wdata    : value to be written in PTPR register.
108 ****************************************************************************************/
109void dev_iob_set_ptpr( xptr_t    dev_xp,
110                       uint32_t  wdata );
111                       
112/*****************************************************************************************
113 * This function invalidates an IOMMU TLB entry identified by its vpn.
114 *****************************************************************************************
115 * @ dev_xp   : extended pointer on IOB device descriptor.
116 * @ vpn      : virtual page number in IO virtual space.
117 ****************************************************************************************/
118void dev_iob_inval_page( xptr_t  dev_xp,
119                         vpn_t   vpn );
120
121/*****************************************************************************************
122 * This function return informations relative to an error reported by the IOMMU.
123 *****************************************************************************************
124 * @ dev_xp   : extended pointer on IOB device descriptor.
125 * @ error    : [out] pointer on buffer for erro type.
126 * @ bvar     : [out] pointer on buffer for bad virtual address.
127 * @ srcid    : [out] pointer on buffer for faulty peripheral index.
128 ****************************************************************************************/
129void dev_iob_get_status( xptr_t     dev_xp,
130                         uint32_t * error,
131                         uint32_t * bvar,
132                         uint32_t * srcid );
133
134#endif  /* _DEV_IOB_H_ */
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