mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2009
|
|
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
#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;
|
|
}
|