104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/*
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* (C) Copyright 2011, Franck JULLIEN, <elec4fun@gmail.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <malloc.h>
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#include <io.h>
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#include <asm/nios2-io.h>
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struct altera_serial_priv {
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struct console_device cdev;
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void __iomem *regs;
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};
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static int altera_serial_setbaudrate(struct console_device *cdev, int baudrate)
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{
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struct altera_serial_priv *priv = container_of(cdev,
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struct altera_serial_priv, cdev);
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struct nios_uart *uart = priv->regs;
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uint16_t div;
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div = (CPU_FREQ / baudrate) - 1;
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writew(div, &uart->divisor);
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return 0;
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}
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static void altera_serial_putc(struct console_device *cdev, char c)
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{
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struct altera_serial_priv *priv = container_of(cdev,
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struct altera_serial_priv, cdev);
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struct nios_uart *uart = priv->regs;
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while ((readw(&uart->status) & NIOS_UART_TRDY) == 0);
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writew(c, &uart->txdata);
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}
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static int altera_serial_tstc(struct console_device *cdev)
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{
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struct altera_serial_priv *priv = container_of(cdev,
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struct altera_serial_priv, cdev);
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struct nios_uart *uart = priv->regs;
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return readw(&uart->status) & NIOS_UART_RRDY;
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}
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static int altera_serial_getc(struct console_device *cdev)
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{
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struct altera_serial_priv *priv = container_of(cdev,
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struct altera_serial_priv, cdev);
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struct nios_uart *uart = priv->regs;
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while (altera_serial_tstc(cdev) == 0);
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return readw(&uart->rxdata) & 0x000000FF;
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}
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static int altera_serial_probe(struct device_d *dev)
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{
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struct console_device *cdev;
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struct altera_serial_priv *priv;
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priv = xzalloc(sizeof(*priv));
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cdev = &priv->cdev;
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priv->regs = dev_request_mem_region(dev, 0);
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cdev->dev = dev;
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cdev->tstc = altera_serial_tstc;
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cdev->putc = altera_serial_putc;
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cdev->getc = altera_serial_getc;
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cdev->setbrg = altera_serial_setbaudrate;
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console_register(cdev);
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return 0;
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}
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static struct driver_d altera_serial_driver = {
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.name = "altera_serial",
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.probe = altera_serial_probe,
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};
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console_platform_driver(altera_serial_driver);
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