/****************************************************************************
* 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 <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <arch/irq.h>
#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]);
}
}
