spi: Add Marvell Kirkwood SPI driver

This patch adds a SPI driver for the Marvell Kirkwood SoC's.

Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>

include/asm-arm/arch-kirkwood/spi.h

@@ -0,0 +1,56 @@
+/*
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * Derived from drivers/spi/mpc8xxx_spi.c
+ *
+ * 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 __KW_SPI_H__
+#define __KW_SPI_H__
+
+/* SPI Registers on kirkwood SOC */
+struct kwspi_registers {
+	u32 ctrl;	/* 0x10600 */
+	u32 cfg;	/* 0x10604 */
+	u32 dout;	/* 0x10608 */
+	u32 din;	/* 0x1060c */
+	u32 irq_cause;	/* 0x10610 */
+	u32 irq_mask;	/* 0x10614 */
+};
+
+#define KWSPI_CLKPRESCL_MASK	0x1f
+#define KWSPI_CSN_ACT		1 /* Activates serial memory interface */
+#define KWSPI_SMEMRDY		(1 << 1) /* SerMem Data xfer ready */
+#define KWSPI_IRQUNMASK		1 /* unmask SPI interrupt */
+#define KWSPI_IRQMASK		0 /* mask SPI interrupt */
+#define KWSPI_SMEMRDIRQ		1 /* SerMem data xfer ready irq */
+#define KWSPI_XFERLEN_1BYTE	0
+#define KWSPI_XFERLEN_2BYTE	(1 << 5)
+#define KWSPI_XFERLEN_MASK	(1 << 5)
+#define KWSPI_ADRLEN_1BYTE	0
+#define KWSPI_ADRLEN_2BYTE	1 << 8
+#define KWSPI_ADRLEN_3BYTE	2 << 8
+#define KWSPI_ADRLEN_4BYTE	3 << 8
+#define KWSPI_ADRLEN_MASK	3 << 8
+#define KWSPI_TIMEOUT		10000
+
+#endif /* __KW_SPI_H__ */