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author | Franck JULLIEN <franck.jullien@gmail.com> | 2011-04-03 23:07:17 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-04-08 11:37:23 +0200 |
commit | 7834d077516ec2d74c5311579098e2f1c89a3253 (patch) | |
tree | 4e579ecb74deab188b3dbb020fffaba8064e6dc6 | |
parent | 8dfebf96d79aa8e37c2299af8c02a84d30f5e9e7 (diff) | |
download | barebox-7834d077516ec2d74c5311579098e2f1c89a3253.tar.gz barebox-7834d077516ec2d74c5311579098e2f1c89a3253.tar.xz |
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>
-rw-r--r-- | drivers/serial/Kconfig | 5 | ||||
-rw-r--r-- | drivers/serial/Makefile | 3 | ||||
-rw-r--r-- | drivers/serial/serial_altera.c | 95 |
3 files changed, 102 insertions, 1 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index ffd877a410..9e05f4bec5 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -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" diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 9f0e12b01d..df9e705c8a 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -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 diff --git a/drivers/serial/serial_altera.c b/drivers/serial/serial_altera.c new file mode 100644 index 0000000000..54c717810e --- /dev/null +++ b/drivers/serial/serial_altera.c @@ -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); + |