1 /* 2 * SPI flash interface 3 * 4 * Copyright (C) 2008 Atmel Corporation 5 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <spi.h> 12 13 static int spi_flash_read_write(struct spi_slave *spi, 14 const u8 *cmd, size_t cmd_len, 15 const u8 *data_out, u8 *data_in, 16 size_t data_len) 17 { 18 unsigned long flags = SPI_XFER_BEGIN; 19 int ret; 20 21 if (data_len == 0) 22 flags |= SPI_XFER_END; 23 24 ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags); 25 if (ret) { 26 debug("SF: Failed to send command (%zu bytes): %d\n", 27 cmd_len, ret); 28 } else if (data_len != 0) { 29 ret = spi_xfer(spi, data_len * 8, data_out, data_in, 30 SPI_XFER_END); 31 if (ret) 32 debug("SF: Failed to transfer %zu bytes of data: %d\n", 33 data_len, ret); 34 } 35 36 return ret; 37 } 38 39 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, 40 size_t cmd_len, void *data, size_t data_len) 41 { 42 return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len); 43 } 44 45 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len) 46 { 47 return spi_flash_cmd_read(spi, &cmd, 1, response, len); 48 } 49 50 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, 51 const void *data, size_t data_len) 52 { 53 return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len); 54 } 55