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Nios2: Add Altera UART driver 

This patch adds Altera UART driver. Kconfig and Makefile are
updated to include this new driver.

Signed-off-by: Franck JULLIEN <franck.jullien@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Franck JULLIEN 2011-04-03 23:07:17 +02:00 committed by Sascha Hauer
parent 8dfebf96d7
commit 7834d07751
3 changed files with 102 additions and 1 deletions
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5
drivers/serial/Kconfig
View File

@ -43,6 +43,11 @@ config DRIVER_SERIAL_BLACKFIN
default y
bool "Blackfin serial driver"
config DRIVER_SERIAL_ALTERA
depends on NIOS2
default y
bool "Altera serial driver"
config DRIVER_SERIAL_NS16550
default n
bool "NS16550 serial driver"

3
drivers/serial/Makefile
View File

@ -5,7 +5,7 @@
# serial_pl010.o
# serial_xuartlite.o
obj-$(CONFIG_DRIVER_SERIAL_ARM_DCC) += arm_dcc.o
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
obj-$(CONFIG_DRIVER_SERIAL_IMX) += serial_imx.o
obj-$(CONFIG_DRIVER_SERIAL_STM378X) += stm-serial.o
obj-$(CONFIG_DRIVER_SERIAL_ATMEL) += atmel.o
@ -16,3 +16,4 @@ obj-$(CONFIG_DRIVER_SERIAL_BLACKFIN) += serial_blackfin.o
obj-$(CONFIG_DRIVER_SERIAL_NS16550) += serial_ns16550.o
obj-$(CONFIG_DRIVER_SERIAL_PL010) += serial_pl010.o
obj-$(CONFIG_DRIVER_SERIAL_S3C24X0) += serial_s3c24x0.o
obj-$(CONFIG_DRIVER_SERIAL_ALTERA) += serial_altera.o

95
drivers/serial/serial_altera.c Normal file
View File

@ -0,0 +1,95 @@
/*
* (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);