1 files changed, 153 insertions, 0 deletions
diff --git a/cpu/arm920t/at91rm9200/spi.c b/cpu/arm920t/at91rm9200/spi.c
new file mode 100644
index 0000000..7469e53
--- /dev/null
+++ b/cpu/arm920t/at91rm9200/spi.c
@@ -0,0 +1,153 @@
+/* Driver for ATMEL DataFlash support
+ * Author : Hamid Ikdoumi (Atmel)
+ *
+ * This program 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <config.h>
+#include <common.h>
+#include <asm/hardware.h>
+
+#ifdef CONFIG_HAS_DATAFLASH
+#include <dataflash.h>
+
+#define AT91C_SPI_CLK	10000000	/* Max Value = 10MHz to be compliant to
+					the Continuous Array Read function */
+
+/* AC Characteristics */
+/* DLYBS = tCSS = 250ns min and DLYBCT = tCSH = 250ns */
+#define DATAFLASH_TCSS	(0xC << 16)
+#define DATAFLASH_TCHS	(0x1 << 24)
+
+#define AT91C_TIMEOUT_WRDY		200000
+#define AT91C_SPI_PCS0_SERIAL_DATAFLASH	0xE	/* Chip Select 0: NPCS0%1110 */
+#define AT91C_SPI_PCS3_DATAFLASH_CARD	0x7	/* Chip Select 3: NPCS3%0111 */
+
+/*-------------------------------------------------------------------*/
+/*	SPI DataFlash Init					     */
+/*-------------------------------------------------------------------*/
+void AT91F_SpiInit(void)
+{
+	/* Configure PIOs */
+	AT91C_BASE_PIOA->PIO_ASR =
+		AT91C_PA3_NPCS0 | AT91C_PA4_NPCS1 | AT91C_PA1_MOSI |
+		AT91C_PA5_NPCS2 | AT91C_PA6_NPCS3 | AT91C_PA0_MISO |
+		AT91C_PA2_SPCK;
+	AT91C_BASE_PIOA->PIO_PDR =
+		AT91C_PA3_NPCS0 | AT91C_PA4_NPCS1 | AT91C_PA1_MOSI |
+		AT91C_PA5_NPCS2 | AT91C_PA6_NPCS3 | AT91C_PA0_MISO |
+		AT91C_PA2_SPCK;
+	/* Enable CLock */
+	AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_SPI;
+
+	/* Reset the SPI */
+	AT91C_BASE_SPI->SPI_CR = AT91C_SPI_SWRST;
+
+	/* Configure SPI in Master Mode with No CS selected !!! */
+	AT91C_BASE_SPI->SPI_MR =
+		AT91C_SPI_MSTR | AT91C_SPI_MODFDIS | AT91C_SPI_PCS;
+
+	/* Configure CS0 and CS3 */
+	*(AT91C_SPI_CSR + 0) =
+		AT91C_SPI_CPOL | (AT91C_SPI_DLYBS & DATAFLASH_TCSS) |
+		(AT91C_SPI_DLYBCT & DATAFLASH_TCHS) |
+		((AT91C_MASTER_CLOCK / (2*AT91C_SPI_CLK)) << 8);
+
+	*(AT91C_SPI_CSR + 3) =
+		AT91C_SPI_CPOL | (AT91C_SPI_DLYBS & DATAFLASH_TCSS) |
+		(AT91C_SPI_DLYBCT & DATAFLASH_TCHS) |
+		((AT91C_MASTER_CLOCK / (2*AT91C_SPI_CLK)) << 8);
+}
+
+void AT91F_SpiEnable(int cs)
+{
+	switch(cs) {
+	case 0:	/* Configure SPI CS0 for Serial DataFlash AT45DBxx */
+		AT91C_BASE_SPI->SPI_MR &= 0xFFF0FFFF;
+		AT91C_BASE_SPI->SPI_MR |=
+			((AT91C_SPI_PCS0_SERIAL_DATAFLASH<<16) &
+				AT91C_SPI_PCS);
+		break;
+	case 3:	/* Configure SPI CS3 for Serial DataFlash Card */
+		/* Set up PIO SDC_TYPE to switch on DataFlash Card */
+		/* and not MMC/SDCard */
+		AT91C_BASE_PIOB->PIO_PER =
+			AT91C_PIO_PB7;	/* Set in PIO mode */
+		AT91C_BASE_PIOB->PIO_OER =
+			AT91C_PIO_PB7;	/* Configure in output */
+		/* Clear Output */
+		AT91C_BASE_PIOB->PIO_CODR = AT91C_PIO_PB7;
+		/* Configure PCS */
+		AT91C_BASE_SPI->SPI_MR &= 0xFFF0FFFF;
+		AT91C_BASE_SPI->SPI_MR |=
+			((AT91C_SPI_PCS3_DATAFLASH_CARD<<16) & AT91C_SPI_PCS);
+		break;
+	}
+
+	/* SPI_Enable */
+	AT91C_BASE_SPI->SPI_CR = AT91C_SPI_SPIEN; }
+
+/*---------------------------------------------------------------------------*/
+/* \fn    AT91F_SpiWrite						     */
+/* \brief Set the PDC registers for a transfert				     */
+/*---------------------------------------------------------------------------*/
+unsigned int AT91F_SpiWrite ( AT91PS_DataflashDesc pDesc )
+{
+	unsigned int timeout;
+
+	pDesc->state = BUSY;
+
+	AT91C_BASE_SPI->SPI_PTCR = AT91C_PDC_TXTDIS + AT91C_PDC_RXTDIS;
+
+	/* Initialize the Transmit and Receive Pointer */
+	AT91C_BASE_SPI->SPI_RPR = (unsigned int)pDesc->rx_cmd_pt ;
+	AT91C_BASE_SPI->SPI_TPR = (unsigned int)pDesc->tx_cmd_pt ;
+
+	/* Intialize the Transmit and Receive Counters */
+	AT91C_BASE_SPI->SPI_RCR = pDesc->rx_cmd_size;
+	AT91C_BASE_SPI->SPI_TCR = pDesc->tx_cmd_size;
+
+	if ( pDesc->tx_data_size != 0 ) {
+		/* Initialize the Next Transmit and Next Receive Pointer */
+		AT91C_BASE_SPI->SPI_RNPR = (unsigned int)pDesc->rx_data_pt ;
+		AT91C_BASE_SPI->SPI_TNPR = (unsigned int)pDesc->tx_data_pt ;
+
+		/* Intialize the Next Transmit and Next Receive Counters */
+		AT91C_BASE_SPI->SPI_RNCR = pDesc->rx_data_size ;
+		AT91C_BASE_SPI->SPI_TNCR = pDesc->tx_data_size ;
+	}
+
+	/* arm simple, non interrupt dependent timer */
+	reset_timer_masked();
+	timeout = 0;
+
+	AT91C_BASE_SPI->SPI_PTCR = AT91C_PDC_TXTEN + AT91C_PDC_RXTEN;
+	while(!(AT91C_BASE_SPI->SPI_SR & AT91C_SPI_RXBUFF) &&
+		((timeout = get_timer_masked() ) < CFG_SPI_WRITE_TOUT));
+	AT91C_BASE_SPI->SPI_PTCR = AT91C_PDC_TXTDIS + AT91C_PDC_RXTDIS;
+	pDesc->state = IDLE;
+
+	if (timeout >= CFG_SPI_WRITE_TOUT){
+		printf("Error Timeout\n\r");
+		return DATAFLASH_ERROR;
+	}
+
+	return DATAFLASH_OK;
+}
+
+#endif
+