156 lines
4.3 KiB
C
156 lines
4.3 KiB
C
/***************************************************************************
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* Copyright (C) 2008 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* Copyright (C) 2008 by Spencer Oliver *
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* spen@spen-soft.co.uk *
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* Copyright (C) 2008 by Frederik Kriewtz *
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* frederik@kriewitz.eu *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (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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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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***************************************************************************/
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#include "dcc_stdio.h"
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#define TARGET_REQ_TRACEMSG 0x00
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#define TARGET_REQ_DEBUGMSG_ASCII 0x01
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#define TARGET_REQ_DEBUGMSG_HEXMSG(size) (0x01 | ((size & 0xff) << 8))
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#define TARGET_REQ_DEBUGCHAR 0x02
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#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) || defined(__ARM_ARCH_6SM__)
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/* we use the System Control Block DCRDR reg to simulate a arm7_9 dcc channel
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* DCRDR[7:0] is used by target for status
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* DCRDR[15:8] is used by target for write buffer
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* DCRDR[23:16] is used for by host for status
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* DCRDR[31:24] is used for by host for write buffer */
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#define NVIC_DBG_DATA_R (*((volatile unsigned short *)0xE000EDF8))
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#define BUSY 1
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void dbg_write(unsigned long dcc_data)
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{
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int len = 4;
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while (len--)
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{
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/* wait for data ready */
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while (NVIC_DBG_DATA_R & BUSY);
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/* write our data and set write flag - tell host there is data*/
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NVIC_DBG_DATA_R = (unsigned short)(((dcc_data & 0xff) << 8) | BUSY);
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dcc_data >>= 8;
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}
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}
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#elif defined(__ARM_ARCH_4T__) || defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5T__)
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void dbg_write(unsigned long dcc_data)
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{
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unsigned long dcc_status;
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do {
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asm volatile("mrc p14, 0, %0, c0, c0" : "=r" (dcc_status));
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} while (dcc_status & 0x2);
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asm volatile("mcr p14, 0, %0, c1, c0" : : "r" (dcc_data));
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}
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#else
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#error unsupported target
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#endif
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void dbg_trace_point(unsigned long number)
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{
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dbg_write(TARGET_REQ_TRACEMSG | (number << 8));
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}
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void dbg_write_u32(const unsigned long *val, long len)
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{
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dbg_write(TARGET_REQ_DEBUGMSG_HEXMSG(4) | ((len & 0xffff) << 16));
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while (len > 0)
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{
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dbg_write(*val);
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val++;
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len--;
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}
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}
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void dbg_write_u16(const unsigned short *val, long len)
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{
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unsigned long dcc_data;
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dbg_write(TARGET_REQ_DEBUGMSG_HEXMSG(2) | ((len & 0xffff) << 16));
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while (len > 0)
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{
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dcc_data = val[0]
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| ((len > 1) ? val[1] << 16: 0x0000);
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dbg_write(dcc_data);
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val += 2;
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len -= 2;
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}
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}
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void dbg_write_u8(const unsigned char *val, long len)
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{
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unsigned long dcc_data;
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dbg_write(TARGET_REQ_DEBUGMSG_HEXMSG(1) | ((len & 0xffff) << 16));
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while (len > 0)
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{
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dcc_data = val[0]
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| ((len > 1) ? val[1] << 8 : 0x00)
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| ((len > 2) ? val[2] << 16 : 0x00)
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| ((len > 3) ? val[3] << 24 : 0x00);
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dbg_write(dcc_data);
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val += 4;
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len -= 4;
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}
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}
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void dbg_write_str(const char *msg)
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{
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long len;
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unsigned long dcc_data;
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for (len = 0; msg[len] && (len < 65536); len++);
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dbg_write(TARGET_REQ_DEBUGMSG_ASCII | ((len & 0xffff) << 16));
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while (len > 0)
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{
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dcc_data = msg[0]
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| ((len > 1) ? msg[1] << 8 : 0x00)
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| ((len > 2) ? msg[2] << 16 : 0x00)
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| ((len > 3) ? msg[3] << 24 : 0x00);
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dbg_write(dcc_data);
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msg += 4;
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len -= 4;
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}
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}
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void dbg_write_char(char msg)
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{
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dbg_write(TARGET_REQ_DEBUGCHAR | ((msg & 0xff) << 16));
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}
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