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94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2007 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief ARM debug support (implementation).
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*
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* \author Francesco Sacchi <batt@develer.com>
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*/
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#include "kdebug_at91.h"
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#include <hw/hw_cpufreq.h> /* for CPU_FREQ */
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#include "hw/hw_ser.h" /* Required for bus macros overrides */
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#include "cfg/cfg_debug.h"
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#include <cfg/macros.h> /* for BV(), DIV_ROUND */
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#include <io/arm.h>
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#if CONFIG_KDEBUG_PORT == KDEBUG_PORT_DBGU
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#define KDBG_WAIT_READY() while (!(DBGU_SR & BV(US_TXRDY))) {}
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#define KDBG_WAIT_TXDONE() while (!(DBGU_SR & BV(US_TXEMPTY))) {}
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#define KDBG_WRITE_CHAR(c) do { DBGU_THR = (c); } while(0)
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/* Debug unit is used only for debug purposes so does not generate interrupts. */
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#define KDBG_MASK_IRQ(old) do { (void)old; } while(0)
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/* Debug unit is used only for debug purposes so does not generate interrupts. */
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#define KDBG_RESTORE_IRQ(old) do { (void)old; } while(0)
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typedef uint32_t kdbg_irqsave_t;
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#else
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#error CONFIG_KDEBUG_PORT should be KDEBUG_PORT_DBGU
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#endif
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INLINE void kdbg_hw_init(void)
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{
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#if CONFIG_KDEBUG_PORT == KDEBUG_PORT_DBGU
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/* Disable all DBGU interrupts. */
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DBGU_IDR = 0xFFFFFFFF;
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/* Reset DBGU */
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DBGU_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS);
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/* Set baudrate */
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DBGU_BRGR = DIV_ROUND(CPU_FREQ, 16 * CONFIG_KDEBUG_BAUDRATE);
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/* Set DBGU mode to 8 data bits, no parity and 1 stop bit. */
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DBGU_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_PAR_NO | US_NBSTOP_1;
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/* Enable DBGU transmitter. */
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DBGU_CR = BV(US_TXEN);
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/* Disable PIO on DGBU tx pin. */
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PIOA_PDR = BV(DTXD);
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PIOA_ASR = BV(DTXD);
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#if 0 /* Disable Rx for now */
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/* Enable DBGU receiver. */
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DBGU_CR = BV(US_RXEN);
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/* Disable PIO on DGBU rx pin. */
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PIOA_PDR = BV(DRXD);
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PIOA_ASR = BV(DRXD);
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#endif
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#else
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#error CONFIG_KDEBUG_PORT should be KDEBUG_PORT_DBGU
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#endif /* CONFIG_KDEBUG_PORT == KDEBUG_PORT_DBGU */
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}
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