| [439] | 1 | /* |
|---|
| 2 | * boot_tty_driver.h - TSAR bootloader TTY driver definition. |
|---|
| 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 | /**************************************************************************** |
|---|
| 25 | * This file defines a nano-driver for SocLib vci_multi_tty component, |
|---|
| 26 | * used by the ALMOS-MKH boot-loader. |
|---|
| 27 | * The SEG_TTY_BASE address must be defined in the 'hard_config.h' file. |
|---|
| 28 | * All accesses to the device registers are performed via 2 low-level |
|---|
| 29 | * functions 'boot_tty_get_register()' and 'boot_tty_set_register()'. |
|---|
| 30 | ****************************************************************************/ |
|---|
| 31 | |
|---|
| 32 | #ifndef BOOT_TTY_DRIVER_H |
|---|
| 33 | #define BOOT_TTY_DRIVER_H |
|---|
| 34 | |
|---|
| [457] | 35 | #include <hal_kernel_types.h> |
|---|
| [439] | 36 | |
|---|
| 37 | /**************************************************************************** |
|---|
| 38 | * Driver register map. * |
|---|
| 39 | ****************************************************************************/ |
|---|
| 40 | |
|---|
| 41 | enum TTY_registers |
|---|
| 42 | { |
|---|
| 43 | TTY_WRITE_REG = 0, /* character to be displayed on screen */ |
|---|
| 44 | TTY_STATUS_REG = 1, /* read and write buffer status */ |
|---|
| 45 | TTY_READ_REG = 2, /* character in the keyboard */ |
|---|
| 46 | TTY_CONFIG_REG = 3, /* unused */ |
|---|
| 47 | |
|---|
| 48 | TTY_SPAN = 4, /* segment size for one channel ( words ) */ |
|---|
| 49 | }; |
|---|
| 50 | |
|---|
| 51 | /**************************************************************************** |
|---|
| 52 | * Driver status value. * |
|---|
| 53 | ****************************************************************************/ |
|---|
| 54 | |
|---|
| 55 | enum TTY_status |
|---|
| 56 | { |
|---|
| 57 | TTY_STATUS_RX_FULL = 1, /* Set if TTY_READ register contains a data. */ |
|---|
| 58 | TTY_STATUS_TX_FULL = 2, /* Set if TTY_WRITE register contains a data. */ |
|---|
| 59 | }; |
|---|
| 60 | |
|---|
| 61 | /**************************************************************************** |
|---|
| 62 | * This function writes a character string from the 'buf' buffer to the |
|---|
| 63 | * boot TTY terminal. It tests the TTY_STATUS register before writing each |
|---|
| 64 | * character of the string to the TTY_WRITE register. If TTY_WRITE_BUSY |
|---|
| 65 | * bit is set, it keeps testing the TTY_STATUS register. If after 10000 |
|---|
| 66 | * retries the bit is still set, the function reports an error and returns. |
|---|
| 67 | **************************************************************************** |
|---|
| 68 | * @ buf : buffer containing the string to be printed. |
|---|
| 69 | * @ nbytes : number of characters to be printed. |
|---|
| 70 | * @ returns 0 on success, -1 on error. |
|---|
| 71 | ****************************************************************************/ |
|---|
| [521] | 72 | int boot_tty_write( const char * buf, |
|---|
| 73 | uint32_t nbytes ); |
|---|
| [439] | 74 | |
|---|
| 75 | #endif // BOOT_TTY_DRIVER_H |
|---|
