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

   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
  12static 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 = 0;
  18        int ret;
  19
  20#ifdef CONFIG_SF_DUAL_FLASH
  21        if (spi->flags & SPI_XFER_U_PAGE)
  22                flags |= SPI_XFER_U_PAGE;
  23#ifdef CONFIG_SPI_GENERIC
  24        if (spi->flags & SPI_XFER_LOWER)
  25                flags |= SPI_XFER_LOWER;
  26        if (spi->flags & SPI_XFER_UPPER)
  27                flags |= SPI_XFER_UPPER;
  28        if (spi->flags & SPI_XFER_STRIPE)
  29                flags |= SPI_XFER_STRIPE;
  30#endif
  31#endif
  32        if (data_len == 0)
  33                flags |= SPI_XFER_END;
  34
  35        ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags | SPI_XFER_BEGIN);
  36        if (ret) {
  37                debug("SF: Failed to send command (%zu bytes): %d\n",
  38                      cmd_len, ret);
  39        } else if (data_len != 0) {
  40                ret = spi_xfer(spi, data_len * 8, data_out, data_in,
  41                                        flags | SPI_XFER_END);
  42                if (ret)
  43                        debug("SF: Failed to transfer %zu bytes of data: %d\n",
  44                              data_len, ret);
  45        }
  46#ifdef CONFIG_SPI_GENERIC
  47        spi->flags &= ~SPI_XFER_MASK;
  48#endif
  49        return ret;
  50}
  51
  52int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
  53                size_t cmd_len, void *data, size_t data_len)
  54{
  55        return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
  56}
  57
  58int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
  59{
  60        return spi_flash_cmd_read(spi, &cmd, 1, response, len);
  61}
  62
  63int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
  64                const void *data, size_t data_len)
  65{
  66        return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
  67}
  68