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 #ifdef CONFIG_SF_DUAL_FLASH 22 if (spi->flags & SPI_XFER_U_PAGE) 23 flags |= SPI_XFER_U_PAGE; 24 #endif 25 if (data_len == 0) 26 flags |= SPI_XFER_END; 27 28 ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags); 29 if (ret) { 30 debug("SF: Failed to send command (%zu bytes): %d\n", 31 cmd_len, ret); 32 } else if (data_len != 0) { 33 ret = spi_xfer(spi, data_len * 8, data_out, data_in, 34 SPI_XFER_END); 35 if (ret) 36 debug("SF: Failed to transfer %zu bytes of data: %d\n", 37 data_len, ret); 38 } 39 40 return ret; 41 } 42 43 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, 44 size_t cmd_len, void *data, size_t data_len) 45 { 46 return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len); 47 } 48 49 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len) 50 { 51 return spi_flash_cmd_read(spi, &cmd, 1, response, len); 52 } 53 54 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, 55 const void *data, size_t data_len) 56 { 57 return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len); 58 } 59