142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/****************************************************************************
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* calypso_spi.c
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* SPI driver for TI Calypso
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*
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* Copyright (C) 2011 Stefan Richter <ichgeh@l--putt.de>
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*
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* All rights reserved.
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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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#include <nuttx/config.h>
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#include <nuttx/spi.h>
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#warning "MOST OF SPI API IS INCOMPLETE! (Wrapper around Osmocom driver)"
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extern void spi_init(void);
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extern int spi_xfer(uint8_t dev_idx, uint8_t bitlen, const void *dout, void *din);
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#ifndef CONFIG_SPI_EXCHANGE
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#error "Calypso HW only supports exchange. Enable CONFIG_SPI_EXCHANGE!"
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#endif
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struct calypso_spidev_s
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{
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struct spi_dev_s spidev; /* External driver interface */
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int nbits; /* Number of transfered bits */
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#ifndef CONFIG_SPI_OWNBUS
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sem_t exclsem; /* Mutual exclusion of devices */
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#endif
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};
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/* STUBS! */
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#ifndef CONFIG_SPI_OWNBUS
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static int spi_lock(FAR struct spi_dev_s *dev, bool lock);
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#endif
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static void spi_select(FAR struct spi_dev_s *dev, enum spi_dev_e devid,
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bool selected)
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{
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}
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static uint32_t spi_setfrequency(FAR struct spi_dev_s *dev, uint32_t frequency)
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{
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return frequency;
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}
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static void spi_setmode(FAR struct spi_dev_s *dev, enum spi_mode_e mode)
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{
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}
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/* Osmocom wrapper */
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static void spi_setbits(FAR struct spi_dev_s *dev, int nbits)
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{
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((FAR struct calypso_spidev_s *)dev)->nbits = nbits;
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}
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static void spi_exchange(FAR struct spi_dev_s *dev, FAR const void *txbuffer,
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FAR void *rxbuffer, size_t nwords)
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{
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FAR struct calypso_spidev_s *priv = (FAR struct calypso_spidev_s *)dev;
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size_t i;
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for(i=0; i<nwords; i++)
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spi_xfer(0, priv->nbits, txbuffer+i, rxbuffer+i);
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}
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static uint16_t spi_send(FAR struct spi_dev_s *dev, uint16_t wd)
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{
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uint16_t buf = wd;
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spi_exchange(dev, &buf, &buf, 1);
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return buf;
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}
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static const struct spi_ops_s g_spiops =
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{
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#ifndef CONFIG_SPI_OWNBUS
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.lock = spi_lock,
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#endif
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.select = spi_select,
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.setfrequency = spi_setfrequency,
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.setmode = spi_setmode,
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.setbits = spi_setbits,
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.status = 0,
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#ifdef CONFIG_SPI_CMDDATA
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.cmddata = ,
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#endif
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.send = spi_send,
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#ifdef CONFIG_SPI_EXCHANGE
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.exchange = spi_exchange,
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#else
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.sndblock = spi_sndblock,
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.recvblock = spi_recvblock,
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#endif
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.registercallback = 0,
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};
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static struct calypso_spidev_s g_spidev =
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{
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.spidev = { &g_spiops },
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.nbits = 0,
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};
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FAR struct spi_dev_s *up_spiinitialize(int port)
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{
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switch(port) {
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case 0: /* SPI master device */
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spi_init();
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return (FAR struct spi_dev_s *)&g_spidev;
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case 1: /* uWire device */
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return NULL;
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default:
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return NULL;
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}
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}
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