source: trunk/kernel/devices/dev_dma.c @ 279

Last change on this file since 279 was 279, checked in by alain, 5 years ago

1) Introduce independant command fields for the various devices in the thread descriptor.
2) Introduce a new dev_pic_enable_ipi() function in the generic PIC device
3) Fix two bugs identified by Maxime in the scheduler initialisation, and in the sched_select().
4) fix several bugs in the TSAR hal_kentry.S.
5) Introduce a third kgiet segment (besides kdata and kcode) in the TSAR bootloader.

File size: 3.9 KB
Line 
1/*
2 * dev_dma.c - DMA (Interrupt Controler Unit) generic device API implementation.
3 *
4 * Authors   Alain Greiner  (2017)
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_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 <spinlock.h>
32#include <dev_dma.h>
33#include <hal_drivers.h>
34
35/////////////////////////////////////////////////////////////////////////////////////////
36// Extern global variables
37/////////////////////////////////////////////////////////////////////////////////////////
38
39extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
40
41//////////////////////////////////
42void dev_dma_init( chdev_t * dma )
43{
44    // get implementation & channel from DMA dma descriptor
45    uint32_t impl    = dma->impl;
46    uint32_t channel = dma->channel;
47
48    // set dma name
49    snprintf( dma->name , 16 , "dma_%d_%x" , channel , local_cxy );
50
51    // call driver init function
52    hal_drivers_dma_init( dma, impl );
53
54    // bind IRQ to the core defined by the DMA channel
55    dev_pic_bind_irq( channel , dma );
56
57    // enable IRQ
58    dev_pic_enable_irq( channel, XPTR( local_cxy , dma ) );
59
60    // create server thread
61    thread_t * new_thread;
62    error_t    error;
63
64    error = thread_kernel_create( &new_thread,
65                                  THREAD_DEV,
66                                  &chdev_sequencial_server,
67                                  dma,
68                                  cluster_select_local_core() );
69    if( error )
70    {
71        assert( false , __FUNCTION__ , "cannot create server thread" );
72    }
73
74    // initialises server field in DMA chdev descriptor
75    dma->server = new_thread;
76   
77    // start server thread
78    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
79
80} // dev_dma_init()
81
82////////////////////////////////////////////////
83error_t dev_dma_remote_memcpy( xptr_t    dst_xp,
84                               xptr_t    src_xp,
85                               uint32_t  size )
86{
87    thread_t * this = CURRENT_THREAD;
88
89    dma_dmsg("\n[INFO] %s : enters for thread %x / dst = %l /src = %l / size = %x\n",
90              __FUNCTION__ , this->trdid , dst_xp , src_xp , size );
91
92    // select DMA channel corresponding to core lid
93    uint32_t channel = this->core->lid;
94
95    // get extended pointer on selected DMA chdev descriptor
96    xptr_t  dev_xp = chdev_dir.dma[channel];
97
98    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined DMA chdev descriptor" );
99
100    // register command in calling thread descriptor
101    this->dma_cmd.dev_xp  = dev_xp;
102    this->dma_cmd.dst_xp  = dst_xp;
103    this->dma_cmd.src_xp  = src_xp;
104    this->dma_cmd.size    = size;
105
106    // register client thread in waiting queue, activate server thread
107    // block client thread on THREAD_BLOCKED_IO and deschedule.
108    // it is re-activated by the ISR signaling IO operation completion.
109    chdev_register_command( dev_xp , this );
110
111    dma_dmsg("\n[INFO] %s : completes for thread %x / error = %d\n", 
112             __FUNCTION__ ,  this->trdid , this->dma_cmd.error );
113
114    // return I/O operation status from calling thread descriptor
115    return this->dma_cmd.error; 
116
117}  // dev_dma_remote_memcpy()
118
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