| /* |
| * (C) Copyright 2011, Franck JULLIEN, <elec4fun@gmail.com> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <common.h> |
| #include <driver.h> |
| #include <init.h> |
| #include <malloc.h> |
| #include <asm/io.h> |
| #include <asm/nios2-io.h> |
| |
| static int altera_serial_setbaudrate(struct console_device *cdev, int baudrate) |
| { |
| struct nios_uart *uart = (struct nios_uart *)cdev->dev->map_base; |
| uint16_t div; |
| |
| div = (CPU_FREQ / baudrate) - 1; |
| writew(div, &uart->divisor); |
| |
| return 0; |
| } |
| |
| static void altera_serial_putc(struct console_device *cdev, char c) |
| { |
| struct nios_uart *uart = (struct nios_uart *)cdev->dev->map_base; |
| |
| while ((readw(&uart->status) & NIOS_UART_TRDY) == 0); |
| |
| writew(c, &uart->txdata); |
| } |
| |
| static int altera_serial_tstc(struct console_device *cdev) |
| { |
| struct nios_uart *uart = (struct nios_uart *)cdev->dev->map_base; |
| |
| return readw(&uart->status) & NIOS_UART_RRDY; |
| } |
| |
| static int altera_serial_getc(struct console_device *cdev) |
| { |
| struct nios_uart *uart = (struct nios_uart *)cdev->dev->map_base; |
| |
| while (altera_serial_tstc(cdev) == 0); |
| |
| return readw(&uart->rxdata) & 0x000000FF; |
| } |
| |
| static int altera_serial_probe(struct device_d *dev) |
| { |
| struct console_device *cdev; |
| |
| cdev = xmalloc(sizeof(struct console_device)); |
| dev->type_data = cdev; |
| cdev->dev = dev; |
| cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR; |
| cdev->tstc = altera_serial_tstc; |
| cdev->putc = altera_serial_putc; |
| cdev->getc = altera_serial_getc; |
| cdev->setbrg = altera_serial_setbaudrate; |
| |
| console_register(cdev); |
| |
| return 0; |
| } |
| |
| static struct driver_d altera_serial_driver = { |
| .name = "altera_serial", |
| .probe = altera_serial_probe, |
| }; |
| |
| static int altera_serial_init(void) |
| { |
| return register_driver(&altera_serial_driver); |
| } |
| |
| console_initcall(altera_serial_init); |
| |