1 /* 2 * Copyright (c) 2019-2020, Broadcom 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <common/debug.h> 8 9 #include <spi.h> 10 11 #define BITS_PER_BYTE 8 12 #define CMD_LEN1 1 13 14 static int spi_flash_read_write(const uint8_t *cmd, 15 size_t cmd_len, 16 const uint8_t *data_out, 17 uint8_t *data_in, 18 size_t data_len) 19 { 20 unsigned long flags = SPI_XFER_BEGIN; 21 int ret; 22 23 if (data_len == 0) 24 flags |= SPI_XFER_END; 25 26 ret = spi_xfer(cmd_len * BITS_PER_BYTE, cmd, NULL, flags); 27 if (ret) { 28 ERROR("SF: Failed to send command (%zu bytes): %d\n", 29 cmd_len, ret); 30 } else if (data_len != 0) { 31 ret = spi_xfer(data_len * BITS_PER_BYTE, data_out, 32 data_in, SPI_XFER_END); 33 if (ret) 34 ERROR("SF: Failed to transfer %zu bytes of data: %d\n", 35 data_len, ret); 36 } 37 38 return ret; 39 } 40 41 int spi_flash_cmd_read(const uint8_t *cmd, 42 size_t cmd_len, 43 void *data, 44 size_t data_len) 45 { 46 return spi_flash_read_write(cmd, cmd_len, NULL, data, data_len); 47 } 48 49 int spi_flash_cmd(uint8_t cmd, void *response, size_t len) 50 { 51 return spi_flash_cmd_read(&cmd, CMD_LEN1, response, len); 52 } 53 54 int spi_flash_cmd_write(const uint8_t *cmd, 55 size_t cmd_len, 56 const void *data, 57 size_t data_len) 58 { 59 return spi_flash_read_write(cmd, cmd_len, data, NULL, data_len); 60 } 61