1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * SPI flash interface
4 *
5 * Copyright (C) 2008 Atmel Corporation
6 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
7 */
8
9 #include <common.h>
10 #include <spi.h>
11
spi_flash_read_write(struct spi_slave * spi,const u8 * cmd,size_t cmd_len,const u8 * data_out,u8 * data_in,size_t data_len)12 static int spi_flash_read_write(struct spi_slave *spi,
13 const u8 *cmd, size_t cmd_len,
14 const u8 *data_out, u8 *data_in,
15 size_t data_len)
16 {
17 unsigned long flags = SPI_XFER_BEGIN;
18 int ret;
19
20 if (data_len == 0)
21 flags |= SPI_XFER_END;
22
23 ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
24 if (ret) {
25 debug("SF: Failed to send command (%zu bytes): %d\n",
26 cmd_len, ret);
27 } else if (data_len != 0) {
28 ret = spi_xfer(spi, data_len * 8, data_out, data_in,
29 SPI_XFER_END);
30 if (ret)
31 debug("SF: Failed to transfer %zu bytes of data: %d\n",
32 data_len, ret);
33 }
34
35 return ret;
36 }
37
spi_flash_cmd_read(struct spi_slave * spi,const u8 * cmd,size_t cmd_len,void * data,size_t data_len)38 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
39 size_t cmd_len, void *data, size_t data_len)
40 {
41 return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
42 }
43
spi_flash_cmd(struct spi_slave * spi,u8 cmd,void * response,size_t len)44 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
45 {
46 return spi_flash_cmd_read(spi, &cmd, 1, response, len);
47 }
48
spi_flash_cmd_write(struct spi_slave * spi,const u8 * cmd,size_t cmd_len,const void * data,size_t data_len)49 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
50 const void *data, size_t data_len)
51 {
52 return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
53 }
54