at91: move dataflash spi driver to drivers/spi

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 157 insertions, 0 deletions

diff --git a/drivers/spi/atmel_dataflash_spi.c b/drivers/spi/atmel_dataflash_spi.c
new file mode 100644
index 0000000..3eb252c
--- /dev/null
+++ b/drivers/spi/atmel_dataflash_spi.c
@@ -0,0 +1,157 @@
+/*
+ * 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 <common.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/io.h>
+#include <asm/arch/at91_pio.h>
+#include <asm/arch/at91_spi.h>
+
+#include <dataflash.h>
+
+#define AT91_SPI_PCS0_DATAFLASH_CARD	0xE	/* Chip Select 0: NPCS0%1110 */
+#define AT91_SPI_PCS1_DATAFLASH_CARD	0xD	/* Chip Select 0: NPCS0%1101 */
+#define AT91_SPI_PCS3_DATAFLASH_CARD	0x7	/* Chip Select 3: NPCS3%0111 */
+
+void AT91F_SpiInit(void)
+{
+	/* Reset the SPI */
+	writel(AT91_SPI_SWRST, AT91_BASE_SPI + AT91_SPI_CR);
+
+	/* Configure SPI in Master Mode with No CS selected !!! */
+	writel(AT91_SPI_MSTR | AT91_SPI_MODFDIS | AT91_SPI_PCS,
+	       AT91_BASE_SPI + AT91_SPI_MR);
+
+	/* Configure CS0 */
+	writel(AT91_SPI_NCPHA |
+	       (AT91_SPI_DLYBS & DATAFLASH_TCSS) |
+	       (AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
+	       ((AT91_MASTER_CLOCK / AT91_SPI_CLK) << 8),
+	       AT91_BASE_SPI + AT91_SPI_CSR(0));
+
+#ifdef CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS1
+	/* Configure CS1 */
+	writel(AT91_SPI_NCPHA |
+	       (AT91_SPI_DLYBS & DATAFLASH_TCSS) |
+	       (AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
+	       ((AT91_MASTER_CLOCK / AT91_SPI_CLK) << 8),
+	       AT91_BASE_SPI + AT91_SPI_CSR(1));
+#endif
+
+#ifdef CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS3
+	/* Configure CS3 */
+	writel(AT91_SPI_NCPHA |
+	       (AT91_SPI_DLYBS & DATAFLASH_TCSS) |
+	       (AT91_SPI_DLYBCT & DATAFLASH_TCHS) |
+	       ((AT91_MASTER_CLOCK / AT91_SPI_CLK) << 8),
+	       AT91_BASE_SPI + AT91_SPI_CSR(3));
+#endif
+
+	/* SPI_Enable */
+	writel(AT91_SPI_SPIEN, AT91_BASE_SPI + AT91_SPI_CR);
+
+	while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_SPIENS));
+
+	/*
+	 * Add tempo to get SPI in a safe state.
+	 * Should not be needed for new silicon (Rev B)
+	 */
+	udelay(500000);
+	readl(AT91_BASE_SPI + AT91_SPI_SR);
+	readl(AT91_BASE_SPI + AT91_SPI_RDR);
+
+}
+
+void AT91F_SpiEnable(int cs)
+{
+	unsigned long mode;
+
+	switch (cs) {
+	case 0:	/* Configure SPI CS0 for Serial DataFlash AT45DBxx */
+		mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
+		mode &= 0xFFF0FFFF;
+		writel(mode | ((AT91_SPI_PCS0_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
+		       AT91_BASE_SPI + AT91_SPI_MR);
+		break;
+	case 1:	/* Configure SPI CS1 for Serial DataFlash AT45DBxx */
+		mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
+		mode &= 0xFFF0FFFF;
+		writel(mode | ((AT91_SPI_PCS1_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
+		       AT91_BASE_SPI + AT91_SPI_MR);
+		break;
+	case 3:
+		mode = readl(AT91_BASE_SPI + AT91_SPI_MR);
+		mode &= 0xFFF0FFFF;
+		writel(mode | ((AT91_SPI_PCS3_DATAFLASH_CARD<<16) & AT91_SPI_PCS),
+		       AT91_BASE_SPI + AT91_SPI_MR);
+		break;
+	}
+
+	/* SPI_Enable */
+	writel(AT91_SPI_SPIEN, AT91_BASE_SPI + AT91_SPI_CR);
+}
+
+unsigned int AT91F_SpiWrite1(AT91PS_DataflashDesc pDesc);
+
+unsigned int AT91F_SpiWrite(AT91PS_DataflashDesc pDesc)
+{
+	unsigned int timeout;
+
+	pDesc->state = BUSY;
+
+	writel(AT91_SPI_TXTDIS + AT91_SPI_RXTDIS, AT91_BASE_SPI + AT91_SPI_PTCR);
+
+	/* Initialize the Transmit and Receive Pointer */
+	writel((unsigned int)pDesc->rx_cmd_pt, AT91_BASE_SPI + AT91_SPI_RPR);
+	writel((unsigned int)pDesc->tx_cmd_pt, AT91_BASE_SPI + AT91_SPI_TPR);
+
+	/* Intialize the Transmit and Receive Counters */
+	writel(pDesc->rx_cmd_size, AT91_BASE_SPI + AT91_SPI_RCR);
+	writel(pDesc->tx_cmd_size, AT91_BASE_SPI + AT91_SPI_TCR);
+
+	if (pDesc->tx_data_size != 0) {
+		/* Initialize the Next Transmit and Next Receive Pointer */
+		writel((unsigned int)pDesc->rx_data_pt, AT91_BASE_SPI + AT91_SPI_RNPR);
+		writel((unsigned int)pDesc->tx_data_pt, AT91_BASE_SPI + AT91_SPI_TNPR);
+
+		/* Intialize the Next Transmit and Next Receive Counters */
+		writel(pDesc->rx_data_size, AT91_BASE_SPI + AT91_SPI_RNCR);
+		writel(pDesc->tx_data_size, AT91_BASE_SPI + AT91_SPI_TNCR);
+	}
+
+	/* arm simple, non interrupt dependent timer */
+	reset_timer_masked();
+	timeout = 0;
+
+	writel(AT91_SPI_TXTEN + AT91_SPI_RXTEN, AT91_BASE_SPI + AT91_SPI_PTCR);
+	while (!(readl(AT91_BASE_SPI + AT91_SPI_SR) & AT91_SPI_RXBUFF) &&
+		((timeout = get_timer_masked()) < CONFIG_SYS_SPI_WRITE_TOUT));
+	writel(AT91_SPI_TXTDIS + AT91_SPI_RXTDIS, AT91_BASE_SPI + AT91_SPI_PTCR);
+	pDesc->state = IDLE;
+
+	if (timeout >= CONFIG_SYS_SPI_WRITE_TOUT) {
+		printf("Error Timeout\n\r");
+		return DATAFLASH_ERROR;
+	}
+
+	return DATAFLASH_OK;
+}