source: trunk/boot/tsar_mips32/boot_tty_driver.c @ 541

Last change on this file since 541 was 541, checked in by nicolas.van.phan@…, 3 years ago

Multiplex bootloader writes on LETI

File size: 3.6 KB
Line 
1/*
2 * boot_tty_driver.c - TSAR bootloader TTY driver implementation.
3 *
4 * Authors :   Alain Greiner / Vu Son  (2016)
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 <boot_config.h>
25#include <boot_tty_driver.h>
26#include <hal_kernel_types.h>
27#include <boot_utils.h>
28
29#ifndef SEG_TXT_BASE
30# error "The SEG_TXT_BASE value should be defined in the 'hard_config.h' file"
31#endif
32
33#ifndef X_IO 
34# error "The X_IO value should be defined in the 'hard_config.h' file"
35#endif
36
37#ifndef Y_IO 
38# error "The Y_IO value should be defined in the 'hard_config.h' file"
39#endif
40
41#ifndef Y_WIDTH
42# error "The Y_WIDTH value should be defined in the 'hard_config.h' file"
43#endif
44
45#ifdef IS_LETI
46  #define TARGET_CLUSTER    0
47#else
48  #define TARGET_CLUSTER    ((X_IO << Y_WIDTH) + Y_IO)
49#endif
50
51
52/////////////////////////////////////////////////////////////////////////////
53// This function returns the value contained in a TTY0 register.
54// @ reg    : register to be read.
55// @ returns the value stored in 'reg'.
56/////////////////////////////////////////////////////////////////////////////
57static uint32_t boot_tty_get_register( uint32_t reg )
58{
59    cxy_t      cxy = TARGET_CLUSTER;
60    uint32_t * ptr = (uint32_t *)SEG_TXT_BASE + reg;
61   
62    return boot_remote_lw( XPTR( cxy , ptr ) ); 
63   
64} // boot_tty_get_register()
65
66/////////////////////////////////////////////////////////////////////////////
67// This function sets a new value to a TTY0 register.
68// @ reg    : register to be configured.
69// @ val    : new value to be written to 'reg'.
70/////////////////////////////////////////////////////////////////////////////
71static void boot_tty_set_register( uint32_t reg, 
72                                   uint32_t val )
73{
74    cxy_t      cxy = TARGET_CLUSTER;
75    uint32_t * ptr = (uint32_t *)SEG_TXT_BASE + reg;
76
77    boot_remote_sw( XPTR( cxy , ptr ) , val ); 
78
79} // boot_tty_set_register()
80
81//////////////////////////////////
82int boot_tty_write( const char * buf,
83                    uint32_t     nbytes )
84{
85    uint32_t nb_printed;
86    uint32_t nb_test;
87    uint32_t error; 
88
89    // Print nbytes to TTY0 terminal
90    for (nb_printed = 0; nb_printed < nbytes; nb_printed++)
91    {
92        // Poll the TTY0 status.
93        if ((boot_tty_get_register(TTY_STATUS_REG) & TTY_STATUS_TX_FULL))
94        {
95            error = 1;
96            for (nb_test = 0; nb_test < 10000; nb_test++)
97            {
98                if ((boot_tty_get_register(TTY_STATUS_REG) & TTY_STATUS_TX_FULL) == 0)
99                {
100                    error = 0;
101                    break;
102                }
103            }
104
105            // Report error after 10000 retries.
106            if (error) return -1;
107        }
108
109        // Write one character to TTY0 terminal.
110        // Special treatment for a newline: Carriage Return before Line Feed.
111        if (buf[nb_printed] == '\n') boot_tty_set_register(TTY_WRITE_REG , (uint32_t)'\r');
112        boot_tty_set_register(TTY_WRITE_REG , (uint32_t)buf[nb_printed]);
113    }
114
115    return 0;
116
117} // boot_tty_write()
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