370 lines
11 KiB
C
370 lines
11 KiB
C
/****************************************************************************
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* boards/arm/lpc17xx_40xx/olimex-lpc1766stk/src/lpc17_40_ssp.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/spi/spi.h>
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#ifdef CONFIG_SPI_CALLBACK
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#include <nuttx/irq.h>
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#endif
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#include <arch/board/board.h>
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#include "arm_internal.h"
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#include "chip.h"
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#include "lpc17_40_gpio.h"
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#include "lpc17_40_ssp.h"
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#include "lpc1766stk.h"
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#if defined(CONFIG_LPC17_40_SSP0) || defined(CONFIG_LPC17_40_SSP1)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#undef HAVE_SPI_CALLBACK
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#ifdef CONFIG_SPI_CALLBACK
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# ifndef CONFIG_LPC17_40_GPIOIRQ
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# warning "CONFIG_LPC17_40_GPIOIRQ is required to support CONFIG_SPI_CALLBACK"
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# else
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# define HAVE_SPI_CALLBACK 1
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# endif
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#endif
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/* Debug ********************************************************************/
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/* Dump GPIO registers */
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#ifdef CONFIG_DEBUG_GPIO_INFO
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# define ssp_dumpssp0gpio(m) lpc17_40_dumpgpio(LPC1766STK_LCD_CS, m)
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# define ssp_dumpssp1gpio(m) lpc17_40_dumpgpio(LPC1766STK_MMC_CS, m)
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#else
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# define ssp_dumpssp0gpio(m)
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# define ssp_dumpssp1gpio(m)
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure describes on media change callback */
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#ifdef HAVE_SPI_CALLBACK
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struct lpc17_40_mediachange_s
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{
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spi_mediachange_t callback; /* The media change callback */
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FAR void *arg; /* Callback argument */
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};
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Registered media change callback */
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#ifdef HAVE_SPI_CALLBACK
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#ifdef CONFIG_LPC17_40_SSP0
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static struct lpc17_40_mediachange_s g_ssp0callback;
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#endif
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#ifdef CONFIG_LPC17_40_SSP1
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static struct lpc17_40_mediachange_s g_ssp1callback;
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#endif
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ssp_cdirqsetup
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*
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* Description:
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* Setup to receive a card detection interrupt
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*
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****************************************************************************/
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#if 0 /* #ifdef HAVE_SPI_CALLBACK */
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static void ssp_cdirqsetup(int irq, xcpt_t irqhandler)
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{
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irqstate_t flags;
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/* Disable interrupts until we are done */
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flags = enter_critical_section();
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/* Configure the interrupt. Either attach and enable the new
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* interrupt or disable and detach the old interrupt handler.
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*/
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if (irqhandler)
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{
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/* Attach then enable the new interrupt handler */
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irq_attach(irq, irqhandler, NULL);
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up_enable_irq(irq);
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}
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else
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{
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/* Disable then detach the old interrupt handler */
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up_disable_irq(irq);
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irq_detach(irq);
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}
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leave_critical_section(flags);
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}
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#endif
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/****************************************************************************
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* Name: ssp0/1_cdinterrupt
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*
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* Description:
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* Handle card detection interrupt
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*
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****************************************************************************/
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#if 0 /* ifdef HAVE_SPI_CALLBACK */
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#ifdef CONFIG_LPC17_40_SSP0
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static int ssp0_cdinterrupt(int irq, FAR void *context)
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{
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/* Invoke the media change callback */
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if (g_ssp0callback.callback)
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{
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g_ssp0callback.callback(g_ssp0callback.arg);
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}
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return OK;
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}
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#endif
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#ifdef CONFIG_LPC17_40_SSP1
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static int ssp1_cdinterrupt(int irq, FAR void *context)
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{
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/* Invoke the media change callback */
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if (g_ssp1callback.callback)
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{
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g_ssp1callback.callback(g_ssp1callback.arg);
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}
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return OK;
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}
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#endif
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lpc1766stk_sspdev_initialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the LPC1766-STK.
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*
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****************************************************************************/
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void weak_function lpc1766stk_sspdev_initialize(void)
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{
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/* Configure the SSP0 chip select GPIOs.
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* Only the Nokia LCD is connected to SSP0
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*/
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#ifdef CONFIG_LPC17_40_SSP0
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ssp_dumpssp0gpio("BEFORE SSP0 Initialization");
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lpc17_40_configgpio(LPC1766STK_LCD_CS);
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ssp_dumpssp0gpio("AFTER SSP0 Initialization");
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#endif
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/* Configure SSP1 chip select GPIOs.
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* Only the SD/MMC card slot is connected to SSP1
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*/
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#ifdef CONFIG_LPC17_40_SSP1
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ssp_dumpssp0gpio("BEFORE SSP1 Initialization");
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lpc17_40_configgpio(LPC1766STK_MMC_CS);
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/* Also configure the SD/MMC power GPIO (but leave power off).
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* This really has nothing to do with SSP, but does belong with other
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* SD/MMC GPIO configuration settings.
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*/
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lpc17_40_configgpio(LPC1766STK_MMC_PWR);
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ssp_dumpssp0gpio("AFTER SSP1 Initialization");
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#endif
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#ifdef HAVE_SPI_CALLBACK
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/* If there were any CD detect pins for the LPC1766-STK, this is where
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* they would be configured.
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*/
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#endif
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}
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/****************************************************************************
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* Name: lpc17_40_ssp0/ssp1select and lpc17_40_ssp0/ssp1status
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*
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* Description:
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* The external functions, lpc17_40_ssp0/ssp1select and
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* lpc17_40_ssp0/ssp1status must be provided by board-specific logic.
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* They are implementations of the select and status methods of the SPI
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* interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
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* All other methods (including lpc17_40_sspbus_initialize())
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* are provided by common LPC17xx/LPC40xx logic.
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* To use this common SPI logic on your board:
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*
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* 1. Provide logic in lpc17_40_boardinitialize() to configure SPI/SSP chip
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* select pins.
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* 2. Provide lpc17_40_ssp0/ssp1select() and lpc17_40_ssp0/ssp1status()
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* functions in your board-specific logic. These functions will perform
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* chip selection and status operations using GPIOs in the way your
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* board is configured.
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* 3. Add a calls to lpc17_40_sspbus_initialize() in your low level
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* application initialization logic
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* 4. The handle returned by lpc17_40_sspbus_initialize() may then be used
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* to bind the SPI driver to higher level logic (e.g., calling
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* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
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* the SPI MMC/SD driver).
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*
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****************************************************************************/
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#ifdef CONFIG_LPC17_40_SSP0
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void lpc17_40_ssp0select(FAR struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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if (devid == SPIDEV_DISPLAY(0))
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{
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/* Assert/de-assert the CS pin to the card */
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ssp_dumpssp0gpio("lpc17_40_ssp0select() Entry");
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lpc17_40_gpiowrite(LPC1766STK_LCD_CS, !selected);
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ssp_dumpssp0gpio("lpc17_40_ssp0select() Exit");
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}
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}
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uint8_t lpc17_40_ssp0status(FAR struct spi_dev_s *dev, uint32_t devid)
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{
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spiinfo("Returning nothing\n");
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return 0;
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}
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#endif
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#ifdef CONFIG_LPC17_40_SSP1
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void lpc17_40_ssp1select(FAR struct spi_dev_s *dev, uint32_t devid,
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bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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if (devid == SPIDEV_MMCSD(0))
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{
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/* Assert/de-assert the CS pin to the card */
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ssp_dumpssp1gpio("lpc17_40_ssp1select() Entry");
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lpc17_40_gpiowrite(LPC1766STK_MMC_CS, !selected);
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ssp_dumpssp1gpio("lpc17_40_ssp1select() Exit");
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}
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}
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uint8_t lpc17_40_ssp1status(FAR struct spi_dev_s *dev, uint32_t devid)
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{
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spiinfo("Returning SPI_STATUS_PRESENT\n");
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return SPI_STATUS_PRESENT;
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}
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#endif
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/****************************************************************************
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* Name: lpc17_40_ssp0/1register
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*
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* Description:
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* If the board supports a card detect callback to inform the SPI-based
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* MMC/SD driver when an SD card is inserted or removed, then
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* CONFIG_SPI_CALLBACK should be defined and the following function(s) must
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* must be implemented. These functions implements the registercallback
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* method of the SPI interface (see include/nuttx/spi/spi.h for details)
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*
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* Input Parameters:
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* dev - Device-specific state data
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* callback - The function to call on the media change
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* arg - A caller provided value to return with the callback
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*
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* Returned Value:
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* 0 on success; negated errno on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_SPI_CALLBACK
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#ifdef CONFIG_LPC17_40_SSP0
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/* If there were any CD detect pins on the LPC1766-STK, this is how the
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* would be configured.
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*/
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int lpc17_40_ssp0register(FAR struct spi_dev_s *dev,
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spi_mediachange_t callback,
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void *arg)
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{
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/* Save the callback information */
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#if 0
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g_ssp0callback.callback = callback;
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g_ssp0callback.arg = arg;
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/* Setup the interrupt */
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spi_cdirqsetup(LPC1766STK_SPICD_IRQ, ssp0_cdinterrupt);
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#endif
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return OK;
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}
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#endif
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#ifdef CONFIG_LPC17_40_SSP1
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int lpc17_40_ssp1register(FAR struct spi_dev_s *dev,
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spi_mediachange_t callback,
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void *arg)
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{
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/* Save the callback information */
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#if 0
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g_ssp1callback.callback = callback;
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g_ssp1callback.arg = arg;
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/* Setup the interrupt */
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spi_cdirqsetup(LPC1766STK_SPICD_IRQ, ssp1_cdinterrupt);
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#endif
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return OK;
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}
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#endif
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#endif
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#endif /* CONFIG_LPC17_40_SSP0 || CONFIG_LPC17_40_SSP1 */
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