/**************************************************************************** * boards/arm/lpc17xx_40xx/olimex-lpc1766stk/src/lpc17_40_ssp.c * * Copyright (C) 2010, 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 #include #include #include #ifdef CONFIG_SPI_CALLBACK #include #endif #include #include "arm_arch.h" #include "chip.h" #include "lpc17_40_gpio.h" #include "lpc17_40_ssp.h" #include "lpc1766stk.h" #if defined(CONFIG_LPC17_40_SSP0) || defined(CONFIG_LPC17_40_SSP1) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************/ #undef HAVE_SPI_CALLBACK #ifdef CONFIG_SPI_CALLBACK # ifndef CONFIG_LPC17_40_GPIOIRQ # warning "CONFIG_LPC17_40_GPIOIRQ is required to support CONFIG_SPI_CALLBACK" # else # define HAVE_SPI_CALLBACK 1 # endif #endif /* Debug ********************************************************************/ /* Dump GPIO registers */ #ifdef CONFIG_DEBUG_GPIO_INFO # define ssp_dumpssp0gpio(m) lpc17_40_dumpgpio(LPC1766STK_LCD_CS, m) # define ssp_dumpssp1gpio(m) lpc17_40_dumpgpio(LPC1766STK_MMC_CS, m) #else # define ssp_dumpssp0gpio(m) # define ssp_dumpssp1gpio(m) #endif /**************************************************************************** * Private Types ****************************************************************************/ /* This structure describes on media change callback */ #ifdef HAVE_SPI_CALLBACK struct lpc17_40_mediachange_s { spi_mediachange_t callback; /* The media change callback */ FAR void *arg; /* Callback argument */ }; #endif /**************************************************************************** * Private Data ****************************************************************************/ /* Registered media change callback */ #ifdef HAVE_SPI_CALLBACK #ifdef CONFIG_LPC17_40_SSP0 static struct lpc17_40_mediachange_s g_ssp0callback; #endif #ifdef CONFIG_LPC17_40_SSP1 static struct lpc17_40_mediachange_s g_ssp1callback; #endif #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: ssp_cdirqsetup * * Description: * Setup to receive a card detection interrupt * ****************************************************************************/ #if 0 /* #ifdef HAVE_SPI_CALLBACK */ static void ssp_cdirqsetup(int irq, xcpt_t irqhandler) { irqstate_t flags; /* Disable interrupts until we are done */ flags = enter_critical_section(); /* Configure the interrupt. Either attach and enable the new * interrupt or disable and detach the old interrupt handler. */ if (irqhandler) { /* Attach then enable the new interrupt handler */ irq_attach(irq, irqhandler, NULL); up_enable_irq(irq); } else { /* Disable then detach the old interrupt handler */ up_disable_irq(irq); irq_detach(irq); } leave_critical_section(flags); } #endif /**************************************************************************** * Name: ssp0/1_cdinterrupt * * Description: * Handle card detection interrupt * ****************************************************************************/ #if 0 /* ifdef HAVE_SPI_CALLBACK */ #ifdef CONFIG_LPC17_40_SSP0 static int ssp0_cdinterrupt(int irq, FAR void *context) { /* Invoke the media change callback */ if (g_ssp0callback.callback) { g_ssp0callback.callback(g_ssp0callback.arg); } return OK; } #endif #ifdef CONFIG_LPC17_40_SSP1 static int ssp1_cdinterrupt(int irq, FAR void *context) { /* Invoke the media change callback */ if (g_ssp1callback.callback) { g_ssp1callback.callback(g_ssp1callback.arg); } return OK; } #endif #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: lpc1766stk_sspdev_initialize * * Description: * Called to configure SPI chip select GPIO pins for the LPC1766-STK. * ****************************************************************************/ void weak_function lpc1766stk_sspdev_initialize(void) { /* Configure the SSP0 chip select GPIOs. * Only the Nokia LCD is connected to SSP0 */ #ifdef CONFIG_LPC17_40_SSP0 ssp_dumpssp0gpio("BEFORE SSP0 Initialization"); lpc17_40_configgpio(LPC1766STK_LCD_CS); ssp_dumpssp0gpio("AFTER SSP0 Initialization"); #endif /* Configure SSP1 chip select GPIOs. * Only the SD/MMC card slot is connected to SSP1 */ #ifdef CONFIG_LPC17_40_SSP1 ssp_dumpssp0gpio("BEFORE SSP1 Initialization"); lpc17_40_configgpio(LPC1766STK_MMC_CS); /* Also configure the SD/MMC power GPIO (but leave power off). * This really has nothing to do with SSP, but does belong with other * SD/MMC GPIO configuration settings. */ lpc17_40_configgpio(LPC1766STK_MMC_PWR); ssp_dumpssp0gpio("AFTER SSP1 Initialization"); #endif #ifdef HAVE_SPI_CALLBACK /* If there were any CD detect pins for the LPC1766-STK, this is where * they would be configured. */ #endif } /**************************************************************************** * Name: lpc17_40_ssp0/ssp1select and lpc17_40_ssp0/ssp1status * * Description: * The external functions, lpc17_40_ssp0/ssp1select and * lpc17_40_ssp0/ssp1status must be provided by board-specific logic. * They are implementations of the select and status methods of the SPI * interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h). * All other methods (including lpc17_40_sspbus_initialize()) * are provided by common LPC17xx/LPC40xx logic. * To use this common SPI logic on your board: * * 1. Provide logic in lpc17_40_boardinitialize() to configure SPI/SSP chip * select pins. * 2. Provide lpc17_40_ssp0/ssp1select() and lpc17_40_ssp0/ssp1status() * functions in your board-specific logic. These functions will perform * chip selection and status operations using GPIOs in the way your board * is configured. * 3. Add a calls to lpc17_40_sspbus_initialize() in your low level * application initialization logic * 4. The handle returned by lpc17_40_sspbus_initialize() may then be used * to bind the SPI driver to higher level logic (e.g., calling * mmcsd_spislotinitialize(), for example, will bind the SPI driver to * the SPI MMC/SD driver). * ****************************************************************************/ #ifdef CONFIG_LPC17_40_SSP0 void lpc17_40_ssp0select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); if (devid == SPIDEV_DISPLAY(0)) { /* Assert/de-assert the CS pin to the card */ ssp_dumpssp0gpio("lpc17_40_ssp0select() Entry"); lpc17_40_gpiowrite(LPC1766STK_LCD_CS, !selected); ssp_dumpssp0gpio("lpc17_40_ssp0select() Exit"); } } uint8_t lpc17_40_ssp0status(FAR struct spi_dev_s *dev, uint32_t devid) { spiinfo("Returning nothing\n"); return 0; } #endif #ifdef CONFIG_LPC17_40_SSP1 void lpc17_40_ssp1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected) { spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert"); if (devid == SPIDEV_MMCSD(0)) { /* Assert/de-assert the CS pin to the card */ ssp_dumpssp1gpio("lpc17_40_ssp1select() Entry"); lpc17_40_gpiowrite(LPC1766STK_MMC_CS, !selected); ssp_dumpssp1gpio("lpc17_40_ssp1select() Exit"); } } uint8_t lpc17_40_ssp1status(FAR struct spi_dev_s *dev, uint32_t devid) { spiinfo("Returning SPI_STATUS_PRESENT\n"); return SPI_STATUS_PRESENT; } #endif /**************************************************************************** * Name: lpc17_40_ssp0/1register * * Description: * If the board supports a card detect callback to inform the SPI-based * MMC/SD driver when an SD card is inserted or removed, then * CONFIG_SPI_CALLBACK should be defined and the following function(s) must * must be implemented. These functions implements the registercallback * method of the SPI interface (see include/nuttx/spi/spi.h for details) * * Input Parameters: * dev - Device-specific state data * callback - The function to call on the media change * arg - A caller provided value to return with the callback * * Returned Value: * 0 on success; negated errno on failure. * ****************************************************************************/ #ifdef CONFIG_SPI_CALLBACK #ifdef CONFIG_LPC17_40_SSP0 /* If there were any CD detect pins on the LPC1766-STK, this is how the * would be configured. */ int lpc17_40_ssp0register(FAR struct spi_dev_s *dev, spi_mediachange_t callback, void *arg) { /* Save the callback information */ #if 0 g_ssp0callback.callback = callback; g_ssp0callback.arg = arg; /* Setup the interrupt */ spi_cdirqsetup(LPC1766STK_SPICD_IRQ, ssp0_cdinterrupt); #endif return OK; } #endif #ifdef CONFIG_LPC17_40_SSP1 int lpc17_40_ssp1register(FAR struct spi_dev_s *dev, spi_mediachange_t callback, void *arg) { /* Save the callback information */ #if 0 g_ssp1callback.callback = callback; g_ssp1callback.arg = arg; /* Setup the interrupt */ spi_cdirqsetup(LPC1766STK_SPICD_IRQ, ssp1_cdinterrupt); #endif return OK; } #endif #endif #endif /* CONFIG_LPC17_40_SSP0 || CONFIG_LPC17_40_SSP1 */