LXR uboot/drivers/mtd/spi/sf.c

   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
  13static 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
  43int 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
  49int 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
  54int 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