/**************************************************************************** * arch/arm/src/lpc17/lpc17_emc.c * arch/arm/src/chip/lpc17_emc.c * * Copyright (C) 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 * COPYRIGHT OWNER OR CONTRIBUTORS 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include "lpc17_syscon.h" #include "lpc17_emc.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Public Data ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ static const lpc17_pinset_t g_emcctrl[] = { GPIO_EMC_OE, GPIO_EMC_WE, GPIO_EMC_BLS0, GPIO_EMC_BLS1, GPIO_EMC_BLS2, GPIO_EMC_BLS3, GPIO_EMC_CS0, GPIO_EMC_CS1, GPIO_EMC_CS2, GPIO_EMC_CS3, GPIO_EMC_CAS, GPIO_EMC_RAS, GPIO_EMC_CLK0, GPIO_EMC_CLK1, GPIO_EMC_DYCS0, GPIO_EMC_DYCS1, GPIO_EMC_DYCS2, GPIO_EMC_DYCS3, GPIO_EMC_CKE0, GPIO_EMC_CKE1, GPIO_EMC_CKE2, GPIO_EMC_CKE3, GPIO_EMC_DQM0, GPIO_EMC_DQM1, GPIO_EMC_DQM2, GPIO_EMC_DQM3, }; #define EMC_NCTRL (sizeof(g_emcctrl) / sizeof(lpc17_pinset_t)) static const lpc17_pinset_t g_emcdata[] = { GPIO_EMC_D0, GPIO_EMC_D1, GPIO_EMC_D2, GPIO_EMC_D3, GPIO_EMC_D4, GPIO_EMC_D5, GPIO_EMC_D6, GPIO_EMC_D7, GPIO_EMC_D8, GPIO_EMC_D9, GPIO_EMC_D10, GPIO_EMC_D11, GPIO_EMC_D12, GPIO_EMC_D13, GPIO_EMC_D14, GPIO_EMC_D15, GPIO_EMC_D16, GPIO_EMC_D17, GPIO_EMC_D18, GPIO_EMC_D19, GPIO_EMC_D20, GPIO_EMC_D21, GPIO_EMC_D22, GPIO_EMC_D23, GPIO_EMC_D24, GPIO_EMC_D25, GPIO_EMC_D26, GPIO_EMC_D27, GPIO_EMC_D28, GPIO_EMC_D29, GPIO_EMC_D30, GPIO_EMC_D31, }; /* You can limit the number of data lines configured by defining * BOARD_NDATA in your board.h header file. */ #ifdef BOARD_NDATA # define EMC_NDATA BOARD_NDATA #else # define EMC_NDATA (sizeof(g_emcdata) / sizeof(lpc17_pinset_t)) #endif static const lpc17_pinset_t g_emcaddr[] = { GPIO_EMC_A0, GPIO_EMC_A1, GPIO_EMC_A2, GPIO_EMC_A3, GPIO_EMC_A4, GPIO_EMC_A5, GPIO_EMC_A6, GPIO_EMC_A7, GPIO_EMC_A8, GPIO_EMC_A9, GPIO_EMC_A10, GPIO_EMC_A11, GPIO_EMC_A12, GPIO_EMC_A13, GPIO_EMC_A14, GPIO_EMC_A15, GPIO_EMC_A16, GPIO_EMC_A17, GPIO_EMC_A18, GPIO_EMC_A19, GPIO_EMC_A20, GPIO_EMC_A21, GPIO_EMC_A22, GPIO_EMC_A23, GPIO_EMC_A24, GPIO_EMC_A25 }; /* You can limit the number of address lines configured by defining * BOARD_NADDR in your board.h header file. */ #ifdef BOARD_NADDR # define EMC_NADDR BOARD_NADDR #else # define EMC_NADDR (sizeof(g_emcaddr) / sizeof(lpc17_pinset_t)) #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: lpc17_emcinitialize * * Description: * Initialize EMC clocking and pin configuration. This function should be * called once when the system first boots in order to make the EMC * operational. * ****************************************************************************/ void lpc17_emcinitialize(void) { uint32_t regval; int i; /* Enable clocking for the EMC */ regval = getreg32(LPC17_SYSCON_PCONP); regval |= SYSCON_PCONP_PCEMC; putreg32(regval, LPC17_SYSCON_PCONP); /* Set EMC delay values: * * CMDDLY: Programmable delay value for EMC outputs in command delayed * mode. The delay amount is roughly CMDDLY * 250 picoseconds. * FBCLKDLY: Programmable delay value for the feedback clock that controls * input data sampling. The delay amount is roughly (FBCLKDLY+1) * 250 * picoseconds. * CLKOUT0DLY: Programmable delay value for the CLKOUT0 output. This would * typically be used in clock delayed mode. The delay amount is roughly * (CLKOUT0DLY+1) * 250 picoseconds. * CLKOUT1DLY: Programmable delay value for the CLKOUT1 output. This would * typically be used in clock delayed mode. The delay amount is roughly * (CLKOUT1DLY+1) * 250 picoseconds. */ regval = SYSCON_EMCDLYCTL_CMDDLY(BOARD_CMDDLY) | SYSCON_EMCDLYCTL_FBCLKDLY(BOARD_FBCLKDLY) | SYSCON_EMCDLYCTL_CLKOUT0DLY(BOARD_CLKOUT0DLY) | SYSCON_EMCDLYCTL_CLKOUT1DLY(BOARD_CLKOUT1DLY); putreg32(regval, LPC17_SYSCON_EMCDLYCTL); /* Enable the EMC */ putreg32(EMC_CONTROL_E, LPC17_EMC_CONTROL); putreg32(0, LPC17_EMC_CONFIG); /* Configure EMC pins */ /* Control signals */ for (i = 0; i < EMC_NCTRL; i++) { lpc17_configgpio(g_emcctrl[i]); } /* Data lines */ for (i = 0; i < EMC_NDATA; i++) { lpc17_configgpio(g_emcdata[i]); } /* Address lines */ for (i = 0; i < EMC_NADDR; i++) { lpc17_configgpio(g_emcaddr[i]); } }