source: trunk/kernel/devices/dev_dma.c @ 190

Last change on this file since 190 was 188, checked in by alain, 5 years ago

Redefine the PIC device API.

File size: 4.2 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 <soclib_dma.h>
33#include <dev_dma.h>
34#include <soclib_dma.h>
35
36/////////////////////////////////////////////////////////////////////////////////////////
37// Extern global variables
38/////////////////////////////////////////////////////////////////////////////////////////
39
40extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
41
42////////////////////////////////////
43void dev_dma_init( chdev_t * chdev )
44{
45    // get implementation & channel from DMA chdev descriptor
46    uint32_t impl    = chdev->impl;
47    uint32_t channel = chdev->channel;
48
49    // set chdev name
50    snprintf( chdev->name , 16 , "dma_%d_%x" , channel , local_cxy );
51
52    // set field "cmd", "isr", and call the relevant driver init function
53    if( impl == IMPL_DMA_SCL )
54    {
55        chdev->cmd = &soclib_dma_cmd;
56        chdev->isr = &soclib_dma_isr;
57        soclib_dma_init( chdev );
58    }
59    else
60    {
61        assert( false , __FUNCTION__ , "undefined DMA implementation" );
62    }
63
64    // bind IRQ to the core defined by the DMA channel
65    dev_pic_bind_irq( channel , chdev );
66
67    // enable IRQ
68    dev_pic_enable_irq( channel, chdev );
69
70    // create server thread
71    thread_t * new_thread;
72    error_t    error;
73
74    error = thread_kernel_create( &new_thread,
75                                  THREAD_DEV,
76                                  &chdev_sequencial_server,
77                                  chdev,
78                                  cluster_select_local_core() );
79    if( error )
80    {
81        assert( false , __FUNCTION__ , "cannot create server thread" );
82    }
83
84    // initialises server field in DMA chdev descriptor
85    chdev->server = new_thread;
86   
87    // start server thread
88    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
89
90} // dev_dma_init()
91
92////////////////////////////////////////////////
93error_t dev_dma_remote_memcpy( xptr_t    dst_xp,
94                               xptr_t    src_xp,
95                               uint32_t  size )
96{
97    thread_t * this = CURRENT_THREAD;
98
99    dma_dmsg("\n[INFO] %s : enters for thread %x / dst = %l /src = %l / size = %x\n",
100              __FUNCTION__ , this->trdid , dst_xp , src_xp , size );
101
102    // select DMA channel corresponding to core lid
103    uint32_t channel = this->core->lid;
104
105    // get extended pointer on selected DMA chdev descriptor
106    xptr_t  dev_xp = chdev_dir.dma[channel];
107
108    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined DMA chdev descriptor" );
109
110    // register command in calling thread descriptor
111    this->command.dma.dev_xp  = dev_xp;
112    this->command.dma.dst_xp  = dst_xp;
113    this->command.dma.src_xp  = src_xp;
114    this->command.dma.size    = size;
115
116    // register client thread in waiting queue, activate server thread
117    // block client thread on THREAD_BLOCKED_IO and deschedule.
118    // it is re-activated by the ISR signaling IO operation completion.
119    chdev_register_command( dev_xp , this );
120
121    dma_dmsg("\n[INFO] %s : completes for thread %x / error = %d\n", 
122             __FUNCTION__ ,  this->trdid , this->command.dma.error );
123
124    // return I/O operation status from calling thread descriptor
125    return this->command.dma.error; 
126
127}  // dev_dma_remote_memcpy()
128
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