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authorGuennadi Liakhovetski <lg@denx.de>2009-02-06 10:37:41 +0100
committerAnatolij Gustschin <agust@denx.de>2009-02-24 10:00:28 +0100
commit689551c5ff1b394b88412f3df22144e79468d3a9 (patch)
tree3f9abf31de52f8081367399051d9dc8495616b46 /drivers/video/s6e63d6.c
parentfc7a93c84f3f134484811a0d9ad751fbc1a7da6d (diff)
downloadu-boot-linaro-stable-689551c5ff1b394b88412f3df22144e79468d3a9.tar.gz
A driver for the S6E63D6 SPI display controller from Samsung
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@denx.de> Acked-by: Anatolij Gustschin <agust@denx.de>
Diffstat (limited to 'drivers/video/s6e63d6.c')
-rw-r--r--drivers/video/s6e63d6.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/video/s6e63d6.c b/drivers/video/s6e63d6.c
new file mode 100644
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+++ b/drivers/video/s6e63d6.c
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+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@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>
+
+/*
+ * 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 s6e63d6 *data, u8 rs, u16 word)
+{
+ /*
+ * The start byte looks like (binary):
+ * 01110<ID><RS><R/W>
+ * RS is 0 for index or 1 for data, and R/W is 0 for write.
+ */
+ u32 buf8 = 0x70 | data->id | (rs & 2);
+ u32 buf16 = cpu_to_le16(word);
+ u32 buf_in;
+ int err;
+
+ err = spi_xfer(data->slave, 8, &buf8, &buf_in, SPI_XFER_BEGIN);
+ if (err)
+ return err;
+
+ return spi_xfer(data->slave, 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, 0, idx);
+}
+
+int s6e63d6_param(struct s6e63d6 *data, u16 param)
+{
+ return send_word(data, 2, param);
+}
+
+int s6e63d6_init(struct s6e63d6 *data)
+{
+ if (data->id != 0 && data->id != 4) {
+ printf("s6e63d6: invalid ID %u\n", data->id);
+ return 1;
+ }
+
+ data->slave = spi_setup_slave(data->bus, data->cs, 100000, SPI_MODE_3);
+ if (!data->slave)
+ return 1;
+
+ return 0;
+}