160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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* Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net>
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*
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* (C) Copyright 2000
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* Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
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*
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* (C) Copyright 2004
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* ARM Ltd.
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* Philippe Robin, <philippe.robin@arm.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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/* Simple U-Boot driver for the PrimeCell PL010/PL011 UARTs */
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#include <common.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 "serial_pl010.h"
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static int pl010_setbaudrate(struct console_device *cdev, int baudrate)
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{
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struct pl010_struct *pl010 = cdev->dev->priv;
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unsigned int divisor;
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switch (baudrate) {
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case 9600:
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divisor = UART_PL010_BAUD_9600;
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break;
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case 19200:
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divisor = UART_PL010_BAUD_9600;
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break;
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case 38400:
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divisor = UART_PL010_BAUD_38400;
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break;
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case 57600:
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divisor = UART_PL010_BAUD_57600;
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break;
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case 115200:
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divisor = UART_PL010_BAUD_115200;
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break;
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default:
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divisor = UART_PL010_BAUD_38400;
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}
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writel((divisor & 0xf00) >> 8, &pl010->linctrlmid);
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writel(divisor & 0xff, &pl010->linctrllow);
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/* high register must always be written */
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writel(readl(&pl010->linctrlhigh), &pl010->linctrlhigh);
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return 0;
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}
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static int pl010_init_port(struct console_device *cdev)
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{
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struct pl010_struct *pl010 = cdev->dev->priv;
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/*
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* First, disable everything.
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*/
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writel(0x00, &pl010->ctrl);
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/*
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* Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
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*/
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writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN,
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&pl010->linctrlhigh);
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/*
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* Finally, enable the UART
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*/
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writel(UART_PL010_CR_UARTEN, &pl010->ctrl);
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return 0;
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}
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static void pl010_putc(struct console_device *cdev, char c)
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{
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struct pl010_struct *pl010 = cdev->dev->priv;
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/* Wait until there is space in the FIFO */
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while (readl(&pl010->flag) & UART_PL010_FR_TXFF)
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; /* noop */
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/* Send the character */
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writel(c, &pl010->data);
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}
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static int pl010_getc(struct console_device *cdev)
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{
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struct pl010_struct *pl010 = cdev->dev->priv;
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unsigned int data;
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/* Wait until there is data in the FIFO */
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while (readl(&pl010->flag) & UART_PL010_FR_RXFE)
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; /* noop */
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data = readl(&pl010->data);
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/* Check for an error flag */
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if (data & 0xFFFFFF00) {
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/* Clear the error */
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writel(0xFFFFFFFF, &pl010->errclr);
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return -1;
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}
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return (int)data;
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}
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static int pl010_tstc(struct console_device *cdev)
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{
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struct pl010_struct *pl010 = cdev->dev->priv;
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return !(readl(&pl010->flag) & UART_PL010_FR_RXFE);
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}
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static int pl010_probe(struct device_d *dev)
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{
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struct console_device *cdev;
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cdev = xzalloc(sizeof(struct console_device));
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dev->priv = dev_request_mem_region(dev, 0);
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cdev->dev = dev;
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cdev->tstc = pl010_tstc;
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cdev->putc = pl010_putc;
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cdev->getc = pl010_getc;
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cdev->setbrg = pl010_setbaudrate;
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pl010_init_port(cdev);
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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 pl010_driver = {
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.name = "pl010_serial",
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.probe = pl010_probe,
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};
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console_platform_driver(pl010_driver);
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