1 | /* |
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2 | * boot_tty_driver.c - TSAR bootloader TTY driver implementation. |
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3 | * |
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4 | * Authors : Alain Greiner / Vu Son (2016) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <boot_config.h> |
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25 | #include <boot_tty_driver.h> |
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26 | #include <hal_kernel_types.h> |
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27 | #include <boot_utils.h> |
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28 | |
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29 | #ifndef SEG_TXT_BASE |
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30 | # error "The SEG_TXT_BASE value should be defined in the 'hard_config.h' file" |
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31 | #endif |
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32 | |
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33 | #ifndef X_IO |
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34 | # error "The X_IO value should be defined in the 'hard_config.h' file" |
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35 | #endif |
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36 | |
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37 | #ifndef Y_IO |
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38 | # error "The Y_IO value should be defined in the 'hard_config.h' file" |
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39 | #endif |
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40 | |
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41 | #ifndef Y_WIDTH |
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42 | # error "The Y_WIDTH value should be defined in the 'hard_config.h' file" |
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43 | #endif |
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44 | |
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45 | #ifdef IS_LETI |
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46 | #define TARGET_CLUSTER 0 |
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47 | #else |
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48 | #define TARGET_CLUSTER ((X_IO << Y_WIDTH) + Y_IO) |
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49 | #endif |
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50 | |
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51 | |
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52 | ///////////////////////////////////////////////////////////////////////////// |
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53 | // This function returns the value contained in a TTY0 register. |
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54 | // @ reg : register to be read. |
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55 | // @ returns the value stored in 'reg'. |
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56 | ///////////////////////////////////////////////////////////////////////////// |
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57 | static uint32_t boot_tty_get_register( uint32_t reg ) |
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58 | { |
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59 | cxy_t cxy = TARGET_CLUSTER; |
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60 | uint32_t * ptr = (uint32_t *)SEG_TXT_BASE + reg; |
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61 | |
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62 | return boot_remote_lw( XPTR( cxy , ptr ) ); |
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63 | |
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64 | } // boot_tty_get_register() |
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65 | |
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66 | ///////////////////////////////////////////////////////////////////////////// |
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67 | // This function sets a new value to a TTY0 register. |
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68 | // @ reg : register to be configured. |
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69 | // @ val : new value to be written to 'reg'. |
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70 | ///////////////////////////////////////////////////////////////////////////// |
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71 | static void boot_tty_set_register( uint32_t reg, |
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72 | uint32_t val ) |
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73 | { |
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74 | cxy_t cxy = TARGET_CLUSTER; |
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75 | uint32_t * ptr = (uint32_t *)SEG_TXT_BASE + reg; |
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76 | |
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77 | boot_remote_sw( XPTR( cxy , ptr ) , val ); |
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78 | |
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79 | } // boot_tty_set_register() |
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80 | |
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81 | ////////////////////////////////// |
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82 | int boot_tty_write( const char * buf, |
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83 | uint32_t nbytes ) |
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84 | { |
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85 | uint32_t nb_printed; |
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86 | uint32_t nb_test; |
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87 | uint32_t error; |
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88 | |
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89 | // Print nbytes to TTY0 terminal |
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90 | for (nb_printed = 0; nb_printed < nbytes; nb_printed++) |
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91 | { |
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92 | // Poll the TTY0 status. |
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93 | if ((boot_tty_get_register(TTY_STATUS_REG) & TTY_STATUS_TX_FULL)) |
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94 | { |
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95 | error = 1; |
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96 | for (nb_test = 0; nb_test < 10000; nb_test++) |
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97 | { |
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98 | if ((boot_tty_get_register(TTY_STATUS_REG) & TTY_STATUS_TX_FULL) == 0) |
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99 | { |
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100 | error = 0; |
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101 | break; |
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102 | } |
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103 | } |
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104 | |
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105 | // Report error after 10000 retries. |
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106 | if (error) return -1; |
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107 | } |
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108 | |
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109 | // Write one character to TTY0 terminal. |
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110 | // Special treatment for a newline: Carriage Return before Line Feed. |
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111 | if (buf[nb_printed] == '\n') boot_tty_set_register(TTY_WRITE_REG , (uint32_t)'\r'); |
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112 | boot_tty_set_register(TTY_WRITE_REG , (uint32_t)buf[nb_printed]); |
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113 | } |
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114 | |
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115 | return 0; |
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116 | |
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117 | } // boot_tty_write() |
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