/* * Copyright 2001 MontaVista Software Inc. * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net * Copyright (C) 2000, 2001 Ralf Baechle (ralf@gnu.org) * * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology * Author: Fuxin Zhang, zhangfx@lemote.com * * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * 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., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <linux/io.h> #include <linux/init.h> #include <linux/types.h> #include <asm/serial.h> #define UART16550_BAUD_2400 2400 #define UART16550_BAUD_4800 4800 #define UART16550_BAUD_9600 9600 #define UART16550_BAUD_19200 19200 #define UART16550_BAUD_38400 38400 #define UART16550_BAUD_57600 57600 #define UART16550_BAUD_115200 115200 #define UART16550_PARITY_NONE 0 #define UART16550_PARITY_ODD 0x08 #define UART16550_PARITY_EVEN 0x18 #define UART16550_PARITY_MARK 0x28 #define UART16550_PARITY_SPACE 0x38 #define UART16550_DATA_5BIT 0x0 #define UART16550_DATA_6BIT 0x1 #define UART16550_DATA_7BIT 0x2 #define UART16550_DATA_8BIT 0x3 #define UART16550_STOP_1BIT 0x0 #define UART16550_STOP_2BIT 0x4 /* ----------------------------------------------------- */ /* === CONFIG === */ #ifdef CONFIG_64BIT #define BASE (0xffffffffbfd003f8) #else #define BASE (0xbfd003f8) #endif #define MAX_BAUD BASE_BAUD /* === END OF CONFIG === */ #define REG_OFFSET 1 /* register offset */ #define OFS_RCV_BUFFER 0 #define OFS_TRANS_HOLD 0 #define OFS_SEND_BUFFER 0 #define OFS_INTR_ENABLE (1*REG_OFFSET) #define OFS_INTR_ID (2*REG_OFFSET) #define OFS_DATA_FORMAT (3*REG_OFFSET) #define OFS_LINE_CONTROL (3*REG_OFFSET) #define OFS_MODEM_CONTROL (4*REG_OFFSET) #define OFS_RS232_OUTPUT (4*REG_OFFSET) #define OFS_LINE_STATUS (5*REG_OFFSET) #define OFS_MODEM_STATUS (6*REG_OFFSET) #define OFS_RS232_INPUT (6*REG_OFFSET) #define OFS_SCRATCH_PAD (7*REG_OFFSET) #define OFS_DIVISOR_LSB (0*REG_OFFSET) #define OFS_DIVISOR_MSB (1*REG_OFFSET) /* memory-mapped read/write of the port */ #define UART16550_READ(y) readb((char *)BASE + (y)) #define UART16550_WRITE(y, z) writeb(z, (char *)BASE + (y)) void debugInit(u32 baud, u8 data, u8 parity, u8 stop) { u32 divisor; /* disable interrupts */ UART16550_WRITE(OFS_INTR_ENABLE, 0); /* set up buad rate */ /* set DIAB bit */ UART16550_WRITE(OFS_LINE_CONTROL, 0x80); /* set divisor */ divisor = MAX_BAUD / baud; UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff); UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8); /* clear DIAB bit */ UART16550_WRITE(OFS_LINE_CONTROL, 0x0); /* set data format */ UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop); } static int remoteDebugInitialized; u8 getDebugChar(void) { if (!remoteDebugInitialized) { remoteDebugInitialized = 1; debugInit(UART16550_BAUD_115200, UART16550_DATA_8BIT, UART16550_PARITY_NONE, UART16550_STOP_1BIT); } while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0) ; return UART16550_READ(OFS_RCV_BUFFER); } int putDebugChar(u8 byte) { if (!remoteDebugInitialized) { remoteDebugInitialized = 1; /* debugInit(UART16550_BAUD_115200, UART16550_DATA_8BIT, UART16550_PARITY_NONE, UART16550_STOP_1BIT); */ } while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0) ; UART16550_WRITE(OFS_SEND_BUFFER, byte); return 1; }