| /* |
| * Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net> |
| * |
| * (C) Copyright 2000 |
| * Rob Taylor, Flying Pig Systems. robt@flyingpig.com. |
| * |
| * (C) Copyright 2004 |
| * ARM Ltd. |
| * Philippe Robin, <philippe.robin@arm.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 |
| */ |
| |
| /* Simple U-Boot driver for the PrimeCell PL010/PL011 UARTs */ |
| |
| #include <common.h> |
| #include <init.h> |
| #include <malloc.h> |
| #include <asm/io.h> |
| #include "serial_pl010.h" |
| |
| static int pl010_setbaudrate(struct console_device *cdev, int baudrate) |
| { |
| struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base; |
| unsigned int divisor; |
| |
| switch (baudrate) { |
| case 9600: |
| divisor = UART_PL010_BAUD_9600; |
| break; |
| |
| case 19200: |
| divisor = UART_PL010_BAUD_9600; |
| break; |
| |
| case 38400: |
| divisor = UART_PL010_BAUD_38400; |
| break; |
| |
| case 57600: |
| divisor = UART_PL010_BAUD_57600; |
| break; |
| |
| case 115200: |
| divisor = UART_PL010_BAUD_115200; |
| break; |
| |
| default: |
| divisor = UART_PL010_BAUD_38400; |
| } |
| |
| writel((divisor & 0xf00) >> 8, &pl010->linctrlmid); |
| writel(divisor & 0xff, &pl010->linctrllow); |
| |
| /* high register must always be written */ |
| writel(readl(&pl010->linctrlhigh), &pl010->linctrlhigh); |
| |
| return 0; |
| } |
| |
| static int pl010_init_port(struct console_device *cdev) |
| { |
| struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base; |
| |
| /* |
| * First, disable everything. |
| */ |
| writel(0x00, &pl010->ctrl); |
| |
| /* |
| * Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled. |
| */ |
| writel(UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN, |
| &pl010->linctrlhigh); |
| |
| /* |
| * Finally, enable the UART |
| */ |
| writel(UART_PL010_CR_UARTEN, &pl010->ctrl); |
| |
| return 0; |
| } |
| |
| static void pl010_putc(struct console_device *cdev, char c) |
| { |
| struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base; |
| |
| /* Wait until there is space in the FIFO */ |
| while (readl(&pl010->flag) & UART_PL010_FR_TXFF) |
| ; /* noop */ |
| |
| /* Send the character */ |
| writel(c, &pl010->data); |
| } |
| |
| static int pl010_getc(struct console_device *cdev) |
| { |
| struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base; |
| unsigned int data; |
| |
| /* Wait until there is data in the FIFO */ |
| while (readl(&pl010->flag) & UART_PL010_FR_RXFE) |
| ; /* noop */ |
| |
| data = readl(&pl010->data); |
| |
| /* Check for an error flag */ |
| if (data & 0xFFFFFF00) { |
| /* Clear the error */ |
| writel(0xFFFFFFFF, &pl010->errclr); |
| return -1; |
| } |
| |
| return (int)data; |
| } |
| |
| static int pl010_tstc(struct console_device *cdev) |
| { |
| struct pl010_struct *pl010 = (struct pl010_struct *)cdev->dev->map_base; |
| |
| return !(readl(&pl010->flag) & UART_PL010_FR_RXFE); |
| } |
| |
| static int pl010_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 = pl010_tstc; |
| cdev->putc = pl010_putc; |
| cdev->getc = pl010_getc; |
| cdev->setbrg = pl010_setbaudrate; |
| |
| pl010_init_port(cdev); |
| |
| console_register(cdev); |
| |
| return 0; |
| } |
| |
| static struct driver_d pl010_driver = { |
| .name = "pl010_serial", |
| .probe = pl010_probe, |
| }; |
| |
| static int pl010_init(void) |
| { |
| register_driver(&pl010_driver); |
| |
| return 0; |
| } |
| |
| console_initcall(pl010_init); |