source: trunk/kernel/devices/dev_txt.c @ 126

Last change on this file since 126 was 101, checked in by alain, 7 years ago

euh...

File size: 6.4 KB
RevLine 
[1]1/*
2 * dev_txt.c - TXT (Text Terminal) generic device API implementation.
[49]3 *
[1]4 * Author  Alain Greiner    (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MK
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-kernel; 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 <hal_remote.h>
[77]27#include <hal_drivers.h>
[1]28#include <thread.h>
29#include <rpc.h>
30#include <printk.h>
31#include <dev_txt.h>
[101]32#include <soclib_tty.h>
[1]33
34/////////////////////////////////////////////////////////////////////////////////////////
35// Extern global variables
36/////////////////////////////////////////////////////////////////////////////////////////
37
[3]38extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
[1]39
[3]40extern chdev_pic_input_t  chdev_pic_input;   // allocated in kernel_init.c
[1]41
[3]42////////////////////////////////////
43void dev_txt_init( chdev_t * chdev )
[1]44{
[3]45    // the local ICU chdev must be initialized before the TXT chdev, because
[49]46    // the TXT chdev initialization requires allocation of a WTI from local ICU
[3]47    xptr_t  icu_xp  = chdev_dir.icu[local_cxy];
48    assert( (icu_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before TXT" );
[1]49
[3]50    // get implementation and channel index
51    uint32_t  impl    = chdev->impl;
52    uint32_t  channel = chdev->channel;
[1]53
[23]54    // set chdev name
55    snprintf( chdev->name , 16 , "txt_%d" , chdev->channel );
56
[3]57    // set fields "cmd", "isr", and call driver init function
[1]58    if( impl == IMPL_TXT_TTY )
59    {
[101]60        chdev->cmd = &soclib_tty_cmd;
61        chdev->isr = &soclib_tty_isr;
62        soclib_tty_init( chdev );
[1]63    }
64    else
65    {
[3]66        assert( false , __FUNCTION__ , "undefined TXT device implementation" );
[1]67    }
68
[3]69    // get a WTI mailbox from local ICU
70    uint32_t wti_id = dev_icu_wti_alloc();
71
72    assert( (wti_id != -1) , __FUNCTION__ , "cannot allocate WTI mailbox" );
73
74    // select a core
75    lid_t lid = cluster_select_local_core();
76
77    // enable WTI IRQ and update WTI interrupt vector
78    dev_icu_enable_irq( lid , WTI_TYPE , wti_id , chdev );
79
[49]80    // link IOC IRQ to WTI mailbox in PIC component
[3]81    uint32_t irq_id = chdev_pic_input.txt[channel];
82    dev_pic_bind_irq( irq_id , local_cxy , wti_id );
83
[1]84    // create server thread
[3]85    thread_t * new_thread;
[1]86    error_t    error;
87
[3]88    error = thread_kernel_create( &new_thread,
89                                  THREAD_DEV,
90                                  &chdev_sequencial_server,
91                                  chdev,
[49]92                                  lid );
[3]93    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
[1]94
[3]95    // set "server" field in chdev descriptor
96    chdev->server = new_thread;
[49]97
[1]98    // start server thread
[3]99    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
[49]100}
[1]101
102//////////////////////////////////////////////////////////////////////////////////
[3]103// This static function is called by dev_txt_read(), dev_txt_write() functions.
[1]104////////////////////////////////////i/////////////////////////////////////////////
105static error_t dev_txt_access( uint32_t   type,
106                               uint32_t   channel,
107                               char     * buffer,
108                               uint32_t   count )
109{
110    thread_t * this = CURRENT_THREAD;
111
[49]112    txt_dmsg("\n[INFO] in %s : thread %x in process %x enters\n",
[1]113                 __FUNCTION__ , this->trdid , this->process->pid );
114
115    // check channel argument
[3]116    assert( (channel < CONFIG_MAX_TXT_CHANNELS) , __FUNCTION__ , "illegal channel index" );
[1]117
[3]118    // get extended pointer on remote TXT chdev descriptor
119    xptr_t  dev_xp = chdev_dir.txt[channel];
[1]120
[3]121    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT chdev descriptor" );
[1]122
123    // register command in calling thread descriptor
[3]124    this->command.txt.dev_xp  = dev_xp;
125    this->command.txt.type    = type;
126    this->command.txt.buf_xp  = XPTR( local_cxy , buffer );
127    this->command.txt.count   = count;
[1]128
[3]129    // register client thread in waiting queue, activate server thread
130    // block client thread on THREAD_BLOCKED_IO and deschedule.
131    // it is re-activated by the ISR signaling IO operation completion.
132    chdev_register_command( dev_xp , this );
[1]133
[49]134    txt_dmsg("\n[INFO] in %s : thread %x in process %x completes / error = %d\n",
[3]135             __FUNCTION__ , this->trdid , this->process->pid , this->command.txt.error );
[1]136
137    // return I/O operation status from calling thread descriptor
[49]138    return this->command.txt.error;
139}
[1]140
141/////////////////////////////////////////
142error_t dev_txt_write( uint32_t   channel,
143                       char     * buffer,
144                       uint32_t   count )
145{
146    return dev_txt_access( TXT_WRITE , channel , buffer , count );
147}
[49]148
[1]149/////////////////////////////////////////
150error_t dev_txt_read( uint32_t   channel,
151                      char     * buffer )
152{
153    return dev_txt_access( TXT_READ , channel , buffer , 1 );
154}
155
[3]156///////////////////////////////////////////////
157error_t dev_txt_sync_write( uint32_t   channel,
158                            char     * buffer,
159                            uint32_t   count )
[1]160{
[49]161    // get pointer on calling thread
[3]162    thread_t * this = CURRENT_THREAD;
[1]163
[49]164    // get extended pointer on TXT[0] chdev
[3]165    xptr_t  dev_xp = chdev_dir.txt[channel];
[1]166
[23]167    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined TXT0 chdev descriptor" );
168
[49]169    // register command in calling thread
[3]170    this->command.txt.dev_xp  = dev_xp;
171    this->command.txt.type    = TXT_SYNC_WRITE;
172    this->command.txt.buf_xp  = XPTR( local_cxy , buffer );
173    this->command.txt.count   = count;
[1]174
[49]175    // get driver command function
[3]176    cxy_t       dev_cxy = GET_CXY( dev_xp );
177    chdev_t   * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
178    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
[1]179
[49]180    // call directly driver command
[3]181    cmd( XPTR( local_cxy , this ) );
[1]182
[3]183    // return I/O operation status from calling thread descriptor
184    return this->command.txt.error;
[49]185}
[1]186
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