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authorAjay Bhargav <[ajay.bhargav@einfochips.com]>2011-10-03 14:00:57 +0530
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-10-27 21:56:32 +0200
commit51100cfccac710367249515f685f1a33c95cceb4 (patch)
treeb4a484f7d115c0cb093a258f2cfe4f1f2e80ba92 /arch
parent2e0c1c7d5cafb92f7bee9c8ac4b69f5bed075c67 (diff)
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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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/arch-armada100/spi.h95
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_ */