xref: /openbmc/u-boot/drivers/mtd/spi/sf.c (revision 407b5b956a2e0facf6668fc8b295f4be9205c83e)
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  
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  
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  
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  
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