static int qspi_flash_init_macronix(qspi_flash_t *flash)
{
int ret;
/*
* In QPI mode, only the Fast Read 1-4-4 (0xeb) op code is supported.
* In SPI mode, both the Fast Read 1-1-4 (0x6b) and Fast Read 1-4-4
* (0xeb) op codes are supported but we'd rather use the Fast Read 1-4-4
* command as it is the only one which allows us to enter/leave the
* peformance enhance (continuous read) mode required by XIP operations.
*/
flash->read_opcode = CMD_FAST_READ_1_4_4;
/*
* Check whether the QPI mode is enabled: if it is then we know that
* the Quad Enabled (QE) non-volatile bit is already set. Otherwise,
* we MUST set the QE bit before using any Quad SPI command.
*/
if (flash->read_proto != QSPI_PROTO_4_4_4) {
ret = macronix_quad_enable(flash);
if (ret)
return ret;
flash->read_proto = QSPI_PROTO_1_4_4;
}
return macronix_set_dummy_cycles(flash, 8);
}
static int set_quad_mode(struct spi_nor *nor, u32 jedec_id)
{
int status;
switch (JEDEC_MFR(jedec_id)) {
case CFI_MFR_MACRONIX:
status = macronix_quad_enable(nor);
if (status) {
dev_err(nor->dev, "Macronix quad-read not enabled\n");
return -EINVAL;
}
return status;
default:
status = spansion_quad_enable(nor);
if (status) {
dev_err(nor->dev, "Spansion quad-read not enabled\n");
return -EINVAL;
}
return status;
}
}
