source: trunk/hal/tsar_mips32/drivers/soclib_dma.c @ 436

Last change on this file since 436 was 436, checked in by alain, 4 years ago

1) improve the threads and process destruction mechanism.
2) introduce FIFOs in the soclib_tty driver.

File size: 5.1 KB
Line 
1/*
2 * soclib_dma.c - soclib Multi Channels DMA driver implementation
3 *
4 * Author     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 PARTICULAR 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 <chdev.h>
26#include <dev_dma.h>
27#include <thread.h>
28#include <soclib_dma.h>
29
30///////////////////////////////////////
31void soclib_dma_init( chdev_t * chdev )
32{
33    // get hardware device cluster and local pointer
34    cxy_t      dma_cxy  = GET_CXY( chdev->base );
35    uint32_t * dma_ptr  = (uint32_t *)GET_PTR( chdev->base );
36
37    // set driver specific fields in chdev descriptor
38    chdev->cmd = &soclib_dma_cmd;
39    chdev->isr = &soclib_dma_isr;
40
41    // enable interrupts
42        hal_remote_sw( XPTR( dma_cxy , dma_ptr + DMA_IRQ_DISABLED ) , 0 );
43
44} // soclib_dma_init()
45
46//////////////////////////////////////////////////////////////////
47void __attribute__ ((noinline)) soclib_dma_cmd( xptr_t thread_xp )
48{
49    xptr_t     dev_xp;       // extended pointer on DMA devive
50    xptr_t     dst_xp;       // extended pointer on destination buffer
51    xptr_t     src_xp;       // extended pointer on source buffer
52    uint32_t   size;         // buffer size
53
54    // get client thread cluster and local pointer
55    cxy_t      thread_cxy = GET_CXY( thread_xp );
56    thread_t * thread_ptr = (thread_t *)GET_PTR( thread_xp );
57
58    // get command arguments and extended pointer on DMA device
59    dev_xp = (xptr_t)hal_remote_lwd( XPTR( thread_cxy , &thread_ptr->dma_cmd.dev_xp ) );
60    dst_xp = (xptr_t)hal_remote_lwd( XPTR( thread_cxy , &thread_ptr->dma_cmd.dst_xp ) );
61    src_xp = (xptr_t)hal_remote_lwd( XPTR( thread_cxy , &thread_ptr->dma_cmd.src_xp ) );
62    size   =         hal_remote_lw ( XPTR( thread_cxy , &thread_ptr->dma_cmd.size   ) );
63
64    // get DMA device cluster and local pointer
65    cxy_t     dev_cxy = GET_CXY( dev_xp );
66    chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
67
68    // get extended pointer on SOCLIB-DMA peripheral
69    xptr_t     dma_xp = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->base ) );
70
71    // get SOCLIB_DMA device cluster and local pointer
72    cxy_t      dma_cxy = GET_CXY( dma_xp );
73    uint32_t * dma_ptr = (uint32_t *)GET_PTR( dma_xp );
74
75    // get DMA channel index and channel base address
76    uint32_t * base = dma_ptr + DMA_SPAN * dev_ptr->channel;
77
78    // split dst and src buffers addresses in two 32 bits words
79    uint32_t   dst_lsb = (uint32_t)(dst_xp);
80    uint32_t   dst_msb = (uint32_t)(dst_xp>>32);
81    uint32_t   src_lsb = (uint32_t)(src_xp);
82    uint32_t   src_msb = (uint32_t)(src_xp>>32);
83
84    // set SOCLIB_DMA registers to start tranfer operation
85    hal_remote_sw( XPTR( dma_cxy , base + DMA_SRC     ) , src_lsb ); 
86    hal_remote_sw( XPTR( dma_cxy , base + DMA_SRC_EXT ) , src_msb ); 
87    hal_remote_sw( XPTR( dma_cxy , base + DMA_DST     ) , dst_lsb );
88    hal_remote_sw( XPTR( dma_cxy , base + DMA_DST_EXT ) , dst_msb );
89    hal_remote_sw( XPTR( dma_cxy , base + DMA_LEN     ) , size    );
90
91    // Block and deschedule server thread
92    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR );
93    sched_yield("blocked on ISR");
94   
95} // soclib_dma_cmd()
96
97/////////////////////////////////////////////////////////////////
98void __attribute__ ((noinline)) soclib_dma_isr( chdev_t * chdev )
99{
100    // get extended pointer on client thread
101    xptr_t root      = XPTR( local_cxy , &chdev->wait_root );
102    xptr_t client_xp = XLIST_FIRST_ELEMENT( root , thread_t , wait_list );
103
104    // get extended pointer on server thread
105    xptr_t server_xp = XPTR( local_cxy , &chdev->server );
106
107    // get client thread cluster and local pointer
108    cxy_t      client_cxy = GET_CXY( client_xp );
109    thread_t * client_ptr = (thread_t *)GET_PTR( client_xp );
110
111    // get SOCLIB_DMA peripheral cluster and local pointer
112    cxy_t      dma_cxy  = GET_CXY( chdev->base );
113    uint32_t * dma_ptr  = (uint32_t *)GET_PTR( chdev->base );
114
115    // get DMA channel base address
116    uint32_t * base = dma_ptr + (DMA_SPAN * chdev->channel);
117
118    // get DMA status register
119        uint32_t status = hal_remote_lw( XPTR( dma_cxy , base + DMA_LEN ) );   
120
121    // acknowledge IRQ
122    hal_remote_sw( XPTR( dma_cxy , base + DMA_RESET ) , 0 );
123
124    // set operation status in command
125        error_t  error = ( status != DMA_SUCCESS ); 
126    hal_remote_sw( XPTR( client_cxy , &client_ptr->dma_cmd.error ) , error );
127
128    // unblock server thread
129    thread_unblock( server_xp , THREAD_BLOCKED_ISR );
130
131    // unblock client thread
132    thread_unblock( client_xp , THREAD_BLOCKED_IO );
133
134} // soclib_dma_isr()
135
136
137
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