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