SPI: Add SPI driver support for Marvell Armada100

This patch provides support for SPI emulated over SSP for Marvell
Armada100 SOC.

Signed-off-by: Ajay Bhargav <ajay.bhargav@einfochips.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/arch/arm/include/asm/arch-armada100/spi.h b/arch/arm/include/asm/arch-armada100/spi.h
new file mode 100644
index 0000000..58f0d8f
--- /dev/null
+++ b/arch/arm/include/asm/arch-armada100/spi.h
@@ -0,0 +1,95 @@
+/*
+ * (C) Copyright 2011
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
+ *
+ * (C) Copyright 2010
+ * Marvell Semiconductor <www.marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifndef __ARMADA100_SPI_H_
+#define __ARMADA100_SPI_H_
+
+#include <asm/arch/armada100.h>
+
+#define CAT_BASE_ADDR(x)	ARMD1_SSP ## x ## _BASE
+#define SSP_REG_BASE(x)		CAT_BASE_ADDR(x)
+
+/*
+ * SSP Serial Port Registers
+ * refer Appendix A.26
+ */
+struct ssp_reg {
+	u32 sscr0;	/* SSP Control Register 0 - 0x000 */
+	u32 sscr1;	/* SSP Control Register 1 - 0x004 */
+	u32 sssr;	/* SSP Status Register - 0x008 */
+	u32 ssitr;	/* SSP Interrupt Test Register - 0x00C */
+	u32 ssdr;	/* SSP Data Register - 0x010 */
+	u32 pad1[5];
+	u32 ssto;	/* SSP Timeout Register - 0x028 */
+	u32 sspsp;	/* SSP Programmable Serial Protocol Register - 0x02C */
+	u32 sstsa;	/* SSP TX Timeslot Active Register - 0x030 */
+	u32 ssrsa;	/* SSP RX Timeslot Active Register - 0x034 */
+	u32 sstss;	/* SSP Timeslot Status Register - 0x038 */
+};
+
+#define DEFAULT_WORD_LEN	8
+#define SSP_FLUSH_NUM		0x2000
+#define RX_THRESH_DEF		8
+#define TX_THRESH_DEF		8
+#define TIMEOUT_DEF		1000
+
+#define SSCR1_RIE	(1 << 0)	/* Receive FIFO Interrupt Enable */
+#define SSCR1_TIE	(1 << 1)	/* Transmit FIFO Interrupt Enable */
+#define SSCR1_LBM	(1 << 2)	/* Loop-Back Mode */
+#define SSCR1_SPO	(1 << 3)	/* Motorola SPI SSPSCLK polarity
+					   setting */
+#define SSCR1_SPH	(1 << 4)	/* Motorola SPI SSPSCLK phase setting */
+#define SSCR1_MWDS	(1 << 5)	/* Microwire Transmit Data Size */
+#define SSCR1_TFT	0x03c0		/* Transmit FIFO Threshold (mask) */
+#define SSCR1_RFT	0x3c00		/* Receive FIFO Threshold (mask) */
+
+#define SSCR1_TXTRESH(x)	((x - 1) << 6)	/* level [1..16] */
+#define SSCR1_RXTRESH(x)	((x - 1) << 10)	/* level [1..16] */
+#define SSCR1_TINTE		(1 << 19)	/* Receiver Time-out
+						   Interrupt enable */
+
+#define SSCR0_DSS		0x0f		/* Data Size Select (mask) */
+#define SSCR0_DATASIZE(x)	(x - 1)		/* Data Size Select [4..16] */
+#define SSCR0_FRF		0x30		/* FRame Format (mask) */
+#define SSCR0_MOTO		(0x0 << 4)	/* Motorola's Serial
+						   Peripheral Interface */
+#define SSCR0_TI		(0x1 << 4)	/* TI's Synchronous
+						   Serial Protocol (SSP) */
+#define SSCR0_NATIONAL		(0x2 << 4)	/* National Microwire */
+#define SSCR0_ECS		(1 << 6)	/* External clock select */
+#define SSCR0_SSE		(1 << 7)	/* Synchronous Serial Port
+						   Enable */
+
+#define SSSR_TNF	(1 << 2)	/* Transmit FIFO Not Full */
+#define SSSR_RNE	(1 << 3)	/* Receive FIFO Not Empty */
+#define SSSR_BSY	(1 << 4)	/* SSP Busy */
+#define SSSR_TFS	(1 << 5)	/* Transmit FIFO Service Request */
+#define SSSR_RFS	(1 << 6)	/* Receive FIFO Service Request */
+#define SSSR_ROR	(1 << 7)	/* Receive FIFO Overrun */
+#define SSSR_TINT	(1 << 19)	/* Receiver Time-out Interrupt */
+
+#endif /* __ARMADA100_SPI_H_ */