source: trunk/kernel/devices/dev_dma.c @ 647

Last change on this file since 647 was 647, checked in by alain, 2 years ago

...miscelaneous...

File size: 4.1 KB
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1/*
2 * dev_dma.c - DMA (Interrupt Controler Unit) generic device API implementation.
3 *
4 * Authors   Alain Greiner  (2016,2017,2018,2019)
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 PARTDMALAR 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#include <hal_kernel_types.h>
25#include <hal_special.h>
26#include <chdev.h>
27#include <thread.h>
28#include <cluster.h>
29#include <printk.h>
30#include <memcpy.h>
31#include <dev_dma.h>
32#include <hal_drivers.h>
33
34/////////////////////////////////////////////////////////////////////////////////////////
35// Extern global variables
36/////////////////////////////////////////////////////////////////////////////////////////
37
38extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
39
40//////////////////////////////////
41void dev_dma_init( chdev_t * dma )
42{
43    // get channel from chdev descriptor
44    uint32_t channel = dma->channel;
45
46    // set dma name
47    snprintf( dma->name , 16 , "dma%d_%x" , channel , local_cxy );
48
49    // call driver init function
50    hal_drivers_dma_init( dma );
51
52    // bind IRQ to the core defined by the DMA channel
53    dev_pic_bind_irq( channel , dma );
54
55    // enable IRQ
56    dev_pic_enable_irq( channel, XPTR( local_cxy , dma ) );
57
58    // create server thread
59    thread_t * new_thread;
60    error_t    error;
61
62    lid_t lid = cluster_select_local_core( local_cxy );
63
64    error = thread_kernel_create( &new_thread,
65                                  THREAD_DEV,
66                                  &chdev_server_func,
67                                  dma,
68                                  lid );
69    if( error )
70    {
71        assert( false , "cannot create server thread" );
72    }
73
74    // initialises server field in chdev descriptor
75    dma->server = new_thread;
76
77    // initializes chdev field in thread descriptor
78    new_thread->chdev = dma;
79   
80    // unblock server thread
81    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
82
83} // dev_dma_init()
84
85////////////////////////////////////////////////
86error_t dev_dma_remote_memcpy( xptr_t    dst_xp,
87                               xptr_t    src_xp,
88                               uint32_t  size )
89{
90    thread_t * this = CURRENT_THREAD;
91
92#if CONGIG_DEBUG_DEV_DMA
93uint32_t cycle = (uint32_t)hal_get_cycles();
94if( CONGIG_DEBUG_DEV_DMA < cycle )
95printk("\n[DBG] %s : thread %x enters / dst %l / src %l / size = %x\n",
96__FUNCTION__ , this, dst_xp, src_xp, size );
97#endif
98
99    // select DMA channel corresponding to core lid
100    uint32_t channel = this->core->lid;
101
102    // get extended pointer on selected DMA chdev descriptor
103    xptr_t  dev_xp = chdev_dir.dma[channel];
104
105// check DMA chdev definition
106assert( (dev_xp != XPTR_NULL) , "undefined DMA chdev descriptor" );
107
108    // register command in calling thread descriptor
109    this->dma_cmd.dev_xp  = dev_xp;
110    this->dma_cmd.dst_xp  = dst_xp;
111    this->dma_cmd.src_xp  = src_xp;
112    this->dma_cmd.size    = size;
113
114    // register client thread in waiting queue, activate server thread
115    // block client thread on THREAD_BLOCKED_IO and deschedule.
116    // it is re-activated by the ISR signaling IO operation completion.
117    chdev_register_command( dev_xp );
118
119#if CONGIG_DEBUG_DEV_DMA
120cycle = (uint32_t)hal_get_cycles();
121if( CONGIG_DEBUG_DEV_DMA < cycle )
122printk("\n[DBG] %s : thread %x exit / dst %l / src %l / size = %x\n",
123__FUNCTION__ , this, dst_xp, src_xp, size );
124#endif
125
126    // return I/O operation status from calling thread descriptor
127    return this->dma_cmd.error; 
128
129}  // dev_dma_remote_memcpy()
130
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