mirror of
https://xff.cz/git/u-boot/
synced 2025-10-31 10:26:10 +01:00
689551c5ff
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>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*
|
|
* 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;
|
|
}
|