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/at91sam7x_ek.c 00037 * \brief AT91SAM7X-EK board initialization. 00038 * 00039 * \verbatim 00040 * $Id$ 00041 * \endverbatim 00042 */ 00043 00044 #include <arch/arm.h> 00045 00046 #define PHY_STRAP_AD0 _BV(PB5_ERX0_A) 00047 #define PHY_STRAP_AD1 _BV(PB6_ERX1_A) 00048 #define PHY_STRAP_AD2 _BV(PB13_ERX2_A) 00049 #define PHY_STRAP_AD3 _BV(PB14_ERX3_A) 00050 #define PHY_STRAP_AD4 _BV(PB4_ECRS_A) 00051 #define PHY_STRAP_ISOLATE _BV(PB0_ETXCK_EREFCK_A) 00052 #define PHY_STRAP_10BTSER _BV(PB17_ERXCK_A) 00053 #define PHY_STRAP_RPTR _BV(PB7_ERXER_A) 00054 #define PHY_STRAP_RMII _BV(PB16_ECOL_A) 00055 #define PHY_STRAP_TESTMODE _BV(PB15_ERXDV_ECRSDV_A) 00056 00057 #define PHY_PWRDWN _BV(PB18_EF100_A) 00058 00059 00060 #define PHY_STRAP ( \ 00061 PHY_STRAP_AD0 | PHY_STRAP_AD1 | PHY_STRAP_AD2 | PHY_STRAP_AD3 | \ 00062 PHY_STRAP_AD4 | PHY_STRAP_RMII | PHY_STRAP_TESTMODE ) 00063 00069 static void Sam7xekDelay(int n) 00070 { 00071 int l; 00072 00073 for (l = 0; l < n; l++) { 00074 _NOP(); 00075 } 00076 } 00077 00081 static void Sam7xekClockInit(void) 00082 { 00083 outr(PMC_PCER, _BV(PIOB_ID)); 00084 outr(PMC_PCER, _BV(EMAC_ID)); 00085 } 00086 00090 static void Sam7xekReset(void) 00091 { 00092 unsigned int mr; 00093 00094 /* Save initial configuration. */ 00095 mr = inr(RSTC_MR) & ~RSTC_KEY_MSK; 00096 /* Set reset pulse length to 250us, disable user reset. */ 00097 outr(RSTC_MR, RSTC_KEY | (2 << RSTC_ERSTL_LSB)); 00098 /* Invoke external reset. */ 00099 outr(RSTC_CR, RSTC_KEY | RSTC_EXTRST); 00100 /* If we have 10k/100n RC, we need to wait 25us (1200 cycles) 00101 ** for NRST becoming low. */ 00102 Sam7xekDelay(250); 00103 /* Wait until reset pin is released. */ 00104 while ((inr(RSTC_SR) & RSTC_NRSTL) == 0); 00105 /* Due to the RC filter, the pin is rising very slowly. */ 00106 Sam7xekDelay(25000); 00107 /* Restore initial configuration. */ 00108 outr(RSTC_MR, RSTC_KEY | mr); 00109 } 00110 00119 static void Sam7xekPhyInit(void) 00120 { 00121 /* Power up the PHY. */ 00122 outr(PIOB_PER, PHY_PWRDWN); 00123 outr(PIOB_OER, PHY_PWRDWN); 00124 outr(PIOB_CODR, PHY_PWRDWN); 00125 /* The PHY needs 25ms for powering up. */ 00126 Sam7xekDelay(250000); 00127 /* Disable strap pin pull-ups. */ 00128 outr(PIOB_PUDR, PHY_STRAP); 00129 /* Toggle reset line. */ 00130 Sam7xekReset(); 00131 /* Re-enable the pull-ups. */ 00132 outr(PIOB_PUER, PHY_STRAP); 00133 } 00134 00140 void NutBoardInit(void) 00141 { 00142 Sam7xekClockInit(); 00143 Sam7xekPhyInit(); 00144 }