381 lines
12 KiB
C
381 lines
12 KiB
C
/************************************************************************************
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* configs/olimex-lpc1766stk/src/up_ssp.c
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* arch/arm/src/board/up_ssp.c
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/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 "up_arch.h"
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#include "chip.h"
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#include "lpc17_internal.h"
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#include "lpc1766stk_internal.h"
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#if defined(CONFIG_LPC17_SSP0) || defined(CONFIG_LPC17_SSP1)
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Configuration ************************************************************/
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#ifdef CONFIG_SPI_CALLBACK
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# ifndef CONFIG_GPIO_IRQ
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# warning "CONFIG_GPIO_IRQ is required to support CONFIG_SPI_CALLBACK"
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# endif
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#endif
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/* Debug ********************************************************************/
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/* The following enable debug output from this file (needs CONFIG_DEBUG too).
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*
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* CONFIG_SSP_DEBUG - Define to enable basic SSP debug
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* CONFIG_SSP_VERBOSE - Define to enable verbose SSP debug
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*/
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#ifdef CONFIG_SSP_DEBUG
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# define sspdbg lldbg
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# ifdef CONFIG_SSP_VERBOSE
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# define sspvdbg lldbg
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# else
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# define sspvdbg(x...)
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# endif
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#else
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# undef CONFIG_SSP_VERBOSE
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# define sspdbg(x...)
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# define sspvdbg(x...)
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#endif
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/* Dump GPIO registers */
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#ifdef CONFIG_SSP_VERBOSE
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# define ssp_dumpssp0gpio(m) lpc17_dumpgpio(LPC1766STK_LCD_CS, m)
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# define ssp_dumpssp1gpio(m) lpc17_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 CONFIG_SPI_CALLBACK
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struct lpc17_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 CONFIG_SPI_CALLBACK
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#ifdef CONFIG_LPC17_SSP0
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static struct lpc17_mediachange_s g_ssp0callback;
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#endif
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#ifdef CONFIG_LPC17_SSP1
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static struct lpc17_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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#ifdef CONFIG_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 = irqsave();
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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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(void)irq_attach(irq, irqhandler);
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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 then detach the the old interrupt handler */
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up_disable_irq(irq);
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(void)irq_detach(irq);
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}
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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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#ifdef CONFIG_SPI_CALLBACK
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#ifdef CONFIG_LPC17_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_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: lpc17_sspinitialize
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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 lpc17_sspinitialize(void)
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{
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/* Configure the SSP0 chip select GPIOs. Only the Nokia LCD is connected to SSP0 */
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#ifdef CONFIG_LPC17_SSP0
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ssp_dumpssp0gpio("BEFORE SSP0 Initialization");
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lpc17_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. Only the SD/MMC card slot is connected to SSP1 */
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#ifdef CONFIG_LPC17_SSP1
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ssp_dumpssp0gpio("BEFORE SSP1 Initialization");
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lpc17_configgpio(LPC1766STK_MMC_CS);
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/* Also configure the SD/MMC power GPIO (but leave power off). This really has
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* nothing to do with SSP, but does belong with other SD/MMC GPIO configuration
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* settings.
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*/
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lpc17_configgpio(LPC1766STK_MMC_PWR);
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ssp_dumpssp0gpio("AFTER SSP1 Initialization");
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#endif
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#ifdef CONFIG_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_ssp0/ssp1select and lpc17_ssp0/ssp1status
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*
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* Description:
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* The external functions, lpc17_ssp0/ssp1select and lpc17_ssp0/ssp1status
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* must be provided by board-specific logic. They are implementations of the select
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* and status methods of the SPI interface defined by struct spi_ops_s (see
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* include/nuttx/spi.h). All other methods (including up_spiinitialize())
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* are provided by common LPC17xx logic. To use this common SPI logic on your
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* board:
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*
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* 1. Provide logic in lpc17_boardinitialize() to configure SPI/SSP chip select
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* pins.
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* 2. Provide lpc17_ssp0/ssp1select() and lpc17_ssp0/ssp1status() functions
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* in your board-specific logic. These functions will perform chip selection
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* and status operations using GPIOs in the way your board is configured.
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* 3. Add a calls to up_spiinitialize() in your low level application
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* initialization logic
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* 4. The handle returned by up_spiinitialize() may then be used to bind the
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* 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_SSP0
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void lpc17_ssp0select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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if (devid == SPIDEV_DISPLAY)
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{
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/* Assert/de-assert the CS pin to the card */
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ssp_dumpssp0gpio("lpc17_ssp0select() Entry");
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lpc17_gpiowrite(LPC1766STK_LCD_CS, !selected);
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ssp_dumpssp0gpio("lpc17_ssp0select() Exit");
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}
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}
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uint8_t lpc17_ssp0status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
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{
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sspdbg("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_SSP1
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void lpc17_ssp1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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if (devid == SPIDEV_MMCSD)
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{
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/* Assert/de-assert the CS pin to the card */
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ssp_dumpssp1gpio("lpc17_ssp1select() Entry");
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lpc17_gpiowrite(LPC1766STK_MMC_CS, !selected);
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ssp_dumpssp1gpio("lpc17_ssp1select() Exit");
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}
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}
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uint8_t lpc17_ssp1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
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{
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sspdbg("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_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 drvier 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 functiosn implements the registercallback
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* method of the SPI interface (see include/nuttx/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 funtion 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_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_ssp0register(FAR struct spi_dev_s *dev, spi_mediachange_t callback, 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_SSP1
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int lpc17_ssp1register(FAR struct spi_dev_s *dev, spi_mediachange_t callback, 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_SSP0 || CONFIG_LPC17_SSP1 */
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