[U-Boot] [PATCH 4/9] A driver for the S6E63D6 SPI display controller from Samsung

[Guennadi Liakhovetski]

This is a driver for the S6E63D6 SPI OLED display controller from Samsung. 
It only provides access to controller's registers so the client can freely 
configure it.

Signed-off-by: Guennadi Liakhovetski <lg at denx.de>
---
 drivers/video/Makefile  |    1 +
 drivers/video/s6e63d6.c |   68 +++++++++++++++++++++++++++++++++++++++++++++++
 include/s6e63d6.h       |   36 +++++++++++++++++++++++++
 3 files changed, 105 insertions(+), 0 deletions(-)
 create mode 100644 drivers/video/s6e63d6.c
 create mode 100644 include/s6e63d6.h

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 7fba29f..a7dc74c 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -34,6 +34,7 @@ COBJS-$(CONFIG_VIDEO_SED13806) += sed13806.o
 COBJS-$(CONFIG_SED156X) += sed156x.o
 COBJS-$(CONFIG_VIDEO_SM501) += sm501.o
 COBJS-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o
+COBJS-$(CONFIG_DISPLAY_S6E63D6) += s6e63d6.o
 COBJS-y += videomodes.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/video/s6e63d6.c b/drivers/video/s6e63d6.c
new file mode 100644
index 0000000..27ff976
--- /dev/null
+++ b/drivers/video/s6e63d6.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DEXN Software Engineering, <lg at denx.de>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <spi.h>
+#include <s6e63d6.h>
+
+/* Hardware selected value - 0 or 0x4 */
+#define ID 0
+
+/*
+ * Each transfer is performed as:
+ * 1. chip-select active
+ * 2. send 8-bit start code
+ * 3. send 16-bit data
+ * 4. chip-select inactive
+ */
+static int send_word(struct spi_slave *spi, u8 rs, u16 data)
+{
+	u32 buf8 = 0x70 | ID | (rs & 2);
+	u32 buf16 = cpu_to_le16(data);
+	u32 buf_in;
+	int err;
+
+	err = spi_xfer(spi, 8, &buf8, &buf_in, SPI_XFER_BEGIN);
+	if (err)
+		return err;
+	return spi_xfer(spi, 16, &buf16, &buf_in, SPI_XFER_END);
+}
+
+/* Index and param differ in Register Select bit */
+int s6e63d6_index(struct s6e63d6 *data, u8 idx)
+{
+	return send_word(data->slave, 0, idx);
+}
+
+int s6e63d6_param(struct s6e63d6 *data, u16 param)
+{
+	return send_word(data->slave, 2, param);
+}
+
+int s6e63d6_init(struct s6e63d6 *data)
+{
+	data->slave = spi_setup_slave(data->bus, data->cs, 100000, SPI_MODE_3);
+	if (!data->slave)
+		return 1;
+
+	return 0;
+}
diff --git a/include/s6e63d6.h b/include/s6e63d6.h
new file mode 100644
index 0000000..9665dc5
--- /dev/null
+++ b/include/s6e63d6.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DEXN Software Engineering, <lg at denx.de>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#ifndef _S6E63D6_H_
+#define _S6E63D6_H_
+
+struct s6e63d6 {
+	unsigned int bus;
+	unsigned int cs;
+	struct spi_slave *slave;
+};
+
+extern int s6e63d6_init(struct s6e63d6 *);
+extern int s6e63d6_index(struct s6e63d6 *, u8);
+extern int s6e63d6_param(struct s6e63d6 *, u16);
+
+#endif
-- 
1.5.4