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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