morphoq1.c

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00001 /*
00002  * Copyright 2010 by egnite GmbH
00003  *
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  *
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  * 2. Redistributions in binary form must reproduce the above copyright
00013  *    notice, this list of conditions and the following disclaimer in the
00014  *    documentation and/or other materials provided with the distribution.
00015  * 3. Neither the name of the copyright holders nor the names of
00016  *    contributors may be used to endorse or promote products derived
00017  *    from this software without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00020  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00021  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00022  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
00023  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00024  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00025  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00026  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00027  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00028  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00029  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00030  * SUCH DAMAGE.
00031  *
00032  * For additional information see http://www.ethernut.de/
00033  */
00034 
00035 /*
00036  * \file arch/arm/board/morphoq1.c
00037  * \brief Morphoq 1 board initialization.
00038  *
00039  * \verbatim
00040  * $Id$
00041  * \endverbatim
00042  */
00043 
00044 #include <arch/arm.h>
00045 
00046 #define PHY_STRAP_AD0       _BV(PB7_ERXER_A)
00047 #define PHY_STRAP_AD1       _BV(PB17_ERXCK_A)
00048 #define PHY_STRAP_AD2       _BV(PB14_ERX3_A)
00049 
00050 #define PHY_STRAP_MODE0     _BV(PB5_ERX0_A)
00051 #define PHY_STRAP_MODE1     _BV(PB6_ERX1_A)
00052 #define PHY_STRAP_MODE2     _BV(PB16_ECOL_A)
00053 
00054 #define PHY_STRAP_RMIISEL   _BV(PB13_ERX2_A)
00055 
00056 #define PHY_STRAP   ( \
00057     PHY_STRAP_AD0 | PHY_STRAP_AD1 | PHY_STRAP_AD2 | \
00058     PHY_STRAP_MODE0 | PHY_STRAP_MODE1 | PHY_STRAP_MODE2 | \
00059     PHY_STRAP_RMIISEL )
00060 
00066 static void MorphoqDelay(int n)
00067 {
00068     int l;
00069 
00070     for (l = 0; l < n; l++) {
00071         _NOP();
00072     }
00073 }
00074 
00078 static void MorphoqClockInit(void)
00079 {
00080     outr(PMC_PCER, _BV(PIOA_ID));
00081     outr(PMC_PCER, _BV(PIOB_ID));
00082     outr(PMC_PCER, _BV(EMAC_ID));
00083 }
00084 
00088 static void MorphoqReset(void)
00089 {
00090     /* Set reset pulse length to 250us, disable user reset. */
00091     outr(RSTC_MR, RSTC_KEY | (2 << RSTC_ERSTL_LSB));
00092     /* Invoke external reset. */
00093     outr(RSTC_CR, RSTC_KEY | RSTC_EXTRST);
00094     /* If we have 10k/100n RC, we need to wait 25us (1200 cycles) 
00095     ** for NRST becoming low. */
00096     MorphoqDelay(250);
00097     /* Wait until reset pin is released. */
00098     while ((inr(RSTC_SR) & RSTC_NRSTL) == 0);
00099     /* Due to the RC filter, the pin is rising very slowly. */
00100     MorphoqDelay(25000);
00101 }
00102 
00111 static void MorphoqPhyInit(void)
00112 {
00113     /* The PHY needs 25ms for powering up. */
00114     MorphoqDelay(250000);
00115     /* Disable pull-ups. */
00116     outr(PIOB_PUDR, PHY_STRAP);
00117     outr(PIOB_ODR, PHY_STRAP);
00118     outr(PIOB_PER, PHY_STRAP);
00119     /* Toggle reset line. */
00120     MorphoqReset();
00121     /* Re-enable the pull-ups. */
00122     outr(PIOB_PUER, PHY_STRAP);
00123 }
00124 
00130 void NutBoardInit(void)
00131 {
00132     MorphoqClockInit();
00133     MorphoqPhyInit();
00134 }

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