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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/video/s6e63d6.c
3 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * Each transfer is performed as:
29 * 1. chip-select active
30 * 2. send 8-bit start code
32 * 4. chip-select inactive
34 static int send_word(struct s6e63d6
*data
, u8 rs
, u16 word
)
37 * The start byte looks like (binary):
39 * RS is 0 for index or 1 for data, and R/W is 0 for write.
41 u32 buf8
= 0x70 | data
->id
| (rs
& 2);
42 u32 buf16
= cpu_to_le16(word
);
46 err
= spi_xfer(data
->slave
, 8, &buf8
, &buf_in
, SPI_XFER_BEGIN
);
50 return spi_xfer(data
->slave
, 16, &buf16
, &buf_in
, SPI_XFER_END
);
53 /* Index and param differ in Register Select bit */
54 int s6e63d6_index(struct s6e63d6
*data
, u8 idx
)
56 return send_word(data
, 0, idx
);
59 int s6e63d6_param(struct s6e63d6
*data
, u16 param
)
61 return send_word(data
, 2, param
);
64 int s6e63d6_init(struct s6e63d6
*data
)
66 if (data
->id
!= 0 && data
->id
!= 4) {
67 printf("s6e63d6: invalid ID %u\n", data
->id
);
71 data
->slave
= spi_setup_slave(data
->bus
, data
->cs
, 100000, SPI_MODE_3
);