50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*
|
|
Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
|
|
|
|
This file is part of Aedrix.
|
|
|
|
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.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <init.h>
|
|
#include <drivers/serial.h>
|
|
#include <types.h>
|
|
|
|
#define PL011_SERIAL_BASE 0x10009000
|
|
#define PL011_SERIAL_FLAG_REGISTER 0x18
|
|
#define PL011_SERIAL_BUFFER_FULL (1 << 5)
|
|
|
|
int pl011_putc(char c)
|
|
{
|
|
/* Wait until the serial buffer is empty */
|
|
while (*(volatile uint32*)(PL011_SERIAL_BASE + PL011_SERIAL_FLAG_REGISTER) & (PL011_SERIAL_BUFFER_FULL));
|
|
|
|
/* When it's empty, put our character at the base */
|
|
*(volatile uint32*)PL011_SERIAL_BASE = c;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct serial_dev pl011_dev = {
|
|
.name = "pl011",
|
|
.putc = &pl011_putc
|
|
};
|
|
|
|
void pl011_init() {
|
|
serial_register_device(&pl011_dev);
|
|
}
|
|
|
|
early_initcall(pl011_init);
|