text: /*
   * SPI flash interface
   *
   * Copyright (C) 2008 Atmel Corporation
   * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <spi.h>
  
  static int 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)
  {
  	unsigned long flags = SPI_XFER_BEGIN;
  	int ret;
  
  #ifdef CONFIG_SF_DUAL_FLASH
  	if (spi->flags & SPI_XFER_U_PAGE)
  		flags |= SPI_XFER_U_PAGE;
  #endif
  	if (data_len == 0)
  		flags |= SPI_XFER_END;
  
  	ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
  	if (ret) {
  		debug("SF: Failed to send command (%zu bytes): %d\n",
  		      cmd_len, ret);
  	} else if (data_len != 0) {
  		ret = spi_xfer(spi, data_len * 8, data_out, data_in,
  					SPI_XFER_END);
  		if (ret)
  			debug("SF: Failed to transfer %zu bytes of data: %d\n",
  			      data_len, ret);
  	}
  
  	return ret;
  }
  
  int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
  		size_t cmd_len, void *data, size_t data_len)
  {
  	return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
  }
  
  int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
  {
  	return spi_flash_cmd_read(spi, &cmd, 1, response, len);
  }
  
  int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
  		const void *data, size_t data_len)
  {
  	return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
  }
  