* \author Luca Ottaviano <lottaviano@develer.com>
*/
-#include "cfg/cfg_spi_dma.h"
+#include <drv/spi_dma.h>
-#include "spi_dma_at91.h"
+#include "cfg/cfg_spi_dma.h"
#include "hw/hw_spi_dma.h"
+#include <io/at91sam7.h>
#include <io/kfile.h>
+
#include <struct/fifobuf.h>
#include <struct/kfile_fifo.h>
+
#include <drv/timer.h>
#include <cpu/attr.h>
#define SPI_DMA_IRQ_PRIORITY 4
-void spi_dma_init(SpiDmaAt91 *spi)
+void spi_dma_init(SpiDma *spi)
{
/* Disable PIO on SPI pins */
PIOA_PDR = BV(SPI0_SPCK) | BV(SPI0_MOSI) | BV(SPI0_MISO);
/* Enable SPI */
SPI0_CR = BV(SPI_SPIEN);
- DB(spi->fd._type = KFT_SPIDMAAT91);
+ DB(spi->fd._type = KFT_SPIDMA);
spi->fd.write = spi_dma_write;
spi->fd.read = spi_dma_read;
spi->fd.flush = spi_dma_flush;
--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief SPI driver with DMA.
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Luca Ottaviano <lottaviano@develer.com>
+ */
+
+#include <drv/spi_dma.h>
+
+#include "cfg/cfg_spi_dma.h"
+#include "hw/hw_spi_dma.h"
+
+#include <io/cm3.h>
+#include <io/kfile.h>
+
+#include <struct/fifobuf.h>
+#include <struct/kfile_fifo.h>
+
+#include <drv/timer.h>
+
+#include <cpu/attr.h>
+#include <cpu/power.h>
+
+#include <string.h> /* memset */
+
+
+void spi_dma_setclock(uint32_t rate)
+{
+ SPI0_CSR0 &= ~SPI_SCBR;
+
+ ASSERT((uint8_t)DIV_ROUND(CPU_FREQ, rate));
+ SPI0_CSR0 |= DIV_ROUND(CPU_FREQ, rate) << SPI_SCBR_SHIFT;
+}
+
+
+static int spi_dma_flush(UNUSED_ARG(struct KFile *, fd))
+{
+ /* Wait for DMA to finish */
+ while (!(SPI0_SR & BV(SPI_TXBUFE)))
+ cpu_relax();
+
+ /* Wait until last bit has been shifted out */
+ while (!(SPI0_SR & BV(SPI_TXEMPTY)))
+ cpu_relax();
+
+ return 0;
+}
+
+static size_t spi_dma_write(struct KFile *fd, const void *_buf, size_t size)
+{
+ SPI0_PTCR = BV(PDC_PTCR_TXTDIS);
+ SPI0_TPR = (reg32_t)_buf;
+ SPI0_TCR = size;
+ SPI0_PTCR = BV(PDC_PTSR_TXTEN);
+ spi_dma_flush(fd);
+ return size;
+}
+
+
+/*
+ * Dummy buffer used to transmit 0xff chars while receiving data.
+ * This buffer is completetly constant and the compiler should allocate it
+ * in flash memory.
+ */
+static const uint8_t tx_dummy_buf[CONFIG_SPI_DMA_MAX_RX] = { [0 ... (CONFIG_SPI_DMA_MAX_RX - 1)] = 0xFF };
+
+static size_t spi_dma_read(UNUSED_ARG(struct KFile *, fd), void *_buf, size_t size)
+{
+ size_t count, total_rx = 0;
+ uint8_t *buf = (uint8_t *)_buf;
+
+ while (size)
+ {
+ count = MIN(size, (size_t)CONFIG_SPI_DMA_MAX_RX);
+
+ SPI0_PTCR = BV(PDC_PTCR_TXTDIS) | BV(PDC_PTCR_RXTDIS);
+
+ SPI0_RPR = (reg32_t)buf;
+ SPI0_RCR = count;
+ SPI0_TPR = (reg32_t)tx_dummy_buf;
+ SPI0_TCR = count;
+
+ /* Avoid reading the previous sent char */
+ *buf = SPI0_RDR;
+
+ /* Start transfer */
+ SPI0_PTCR = BV(PDC_PTCR_RXTEN) | BV(PDC_PTCR_TXTEN);
+
+ /* wait for transfer to finish */
+ while (!(SPI0_SR & BV(SPI_ENDRX)))
+ cpu_relax();
+
+ size -= count;
+ total_rx += count;
+ buf += count;
+ }
+ SPI0_PTCR = BV(PDC_PTCR_RXTDIS) | BV(PDC_PTCR_TXTDIS);
+
+ return total_rx;
+}
+
+#define SPI_DMA_IRQ_PRIORITY 4
+
+void spi_dma_init(SpiDma *spi)
+{
+ /* Disable PIO on SPI pins */
+ PIOA_PDR = BV(SPI0_SPCK) | BV(SPI0_MOSI) | BV(SPI0_MISO);
+
+ /* Reset device */
+ SPI0_CR = BV(SPI_SWRST);
+
+ /*
+ * Set SPI to master mode, fixed peripheral select, chip select directly connected to a peripheral device,
+ * SPI clock set to MCK, mode fault detection disabled, loopback disable, NPCS0 active, Delay between CS = 0
+ */
+ SPI0_MR = BV(SPI_MSTR) | BV(SPI_MODFDIS);
+
+ /*
+ * Set SPI mode.
+ * At reset clock division factor is set to 0, that is
+ * *forbidden*. Set SPI clock to minimum to keep it valid.
+ */
+ SPI0_CSR0 = BV(SPI_NCPHA) | (255 << SPI_SCBR_SHIFT);
+
+ /* Disable all irqs */
+ SPI0_IDR = 0xFFFFFFFF;
+ /* Enable SPI clock. */
+ PMC_PCER = BV(SPI0_ID);
+
+ /* Enable SPI */
+ SPI0_CR = BV(SPI_SPIEN);
+
+ DB(spi->fd._type = KFT_SPIDMA);
+ spi->fd.write = spi_dma_write;
+ spi->fd.read = spi_dma_read;
+ spi->fd.flush = spi_dma_flush;
+
+ SPI_DMA_STROBE_INIT();
+}
--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief SPI driver with DMA.
+ *
+ * \note Only one copy of SpiDma is allowed for each application.
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Luca Ottaviano <lottaviano@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#ifndef DRV_SPI_DMA_H
+#define DRV_SPI_DMA_H
+
+#include <io/kfile.h>
+
+typedef struct SpiDma
+{
+ KFile fd;
+} SpiDma;
+
+#define KFT_SPIDMA MAKE_ID('S', 'P', 'I', 'D')
+
+INLINE SpiDma * SPIDMA_CAST(KFile *fd)
+{
+ ASSERT(fd->_type == KFT_SPIDMA);
+ return (SpiDma *)fd;
+}
+
+/**
+ * Init DMA SPI driver.
+ * \param spi A pointer to a SpiDma structure.
+ */
+void spi_dma_init(SpiDma *spi);
+
+/**
+ * Set the clock rate for SPI bus.
+ *
+ * \param rate The rate you want to set for SPI.
+ */
+void spi_dma_setclock(uint32_t rate);
+
+#endif /* DRV_SPI_DMA_H */
--- /dev/null
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2011 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief SPI driver with DMA.
+ *
+ * \note Only one copy of SpiDma is allowed for each application.
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ * \author Luca Ottaviano <lottaviano@develer.com>
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+#ifndef DRV_SPI_DMA_H
+#define DRV_SPI_DMA_H
+
+#include <io/kfile.h>
+
+typedef struct SpiDma
+{
+ KFile fd;
+} SpiDma;
+
+#define KFT_SPIDMA MAKE_ID('S', 'P', 'I', 'D')
+
+INLINE SpiDma * SPIDMA_CAST(KFile *fd)
+{
+ ASSERT(fd->_type == KFT_SPIDMA);
+ return (SpiDma *)fd;
+}
+
+/**
+ * Init DMA SPI driver.
+ * \param spi A pointer to a SpiDma structure.
+ */
+void spi_dma_init(SpiDma *spi);
+
+/**
+ * Set the clock rate for SPI bus.
+ *
+ * \param rate The rate you want to set for SPI.
+ */
+void spi_dma_setclock(uint32_t rate);
+
+#endif /* DRV_SPI_DMA_H */
projects / bertos.git / commitdiff