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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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spi: fsl-espi: add support for dual output read mode
This patch adds support for dual output read mode. It was successfully tested on a P1014-based device with S25FL128S SPINOR flash. With 50MHz SPI clock the read rate is 11MByte/s. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -334,6 +334,8 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
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mpc8xxx_spi->tx_len = mpc8xxx_spi->rxskip;
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mpc8xxx_spi->rx_len = t->len - mpc8xxx_spi->rxskip;
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mpc8xxx_spi->rx = t->rx_buf + mpc8xxx_spi->rxskip;
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if (t->rx_nbits == SPI_NBITS_DUAL)
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spcom |= SPCOM_DO;
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}
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM, spcom);
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@ -369,6 +371,11 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
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int ret;
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mspi->rxskip = fsl_espi_check_rxskip_mode(m);
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if (trans->rx_nbits == SPI_NBITS_DUAL && !mspi->rxskip) {
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dev_err(mspi->dev, "Dual output mode requires RXSKIP mode!\n");
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return -EINVAL;
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}
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fsl_espi_copy_to_buf(m, mspi);
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fsl_espi_setup_transfer(spi, trans);
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@ -387,7 +394,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
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struct spi_message *m)
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{
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struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
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unsigned int delay_usecs = 0;
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unsigned int delay_usecs = 0, rx_nbits = 0;
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struct spi_transfer *t, trans = {};
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int ret;
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@ -398,6 +405,8 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
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list_for_each_entry(t, &m->transfers, transfer_list) {
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if (t->delay_usecs > delay_usecs)
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delay_usecs = t->delay_usecs;
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if (t->rx_nbits > rx_nbits)
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rx_nbits = t->rx_nbits;
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}
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t = list_first_entry(&m->transfers, struct spi_transfer,
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@ -409,6 +418,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
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trans.delay_usecs = delay_usecs;
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trans.tx_buf = mspi->local_buf;
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trans.rx_buf = mspi->local_buf;
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trans.rx_nbits = rx_nbits;
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if (trans.len)
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ret = fsl_espi_trans(m, &trans);
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@ -580,6 +590,7 @@ static int fsl_espi_probe(struct device *dev, struct resource *mem,
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mpc8xxx_spi_probe(dev, mem, irq);
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master->mode_bits |= SPI_RX_DUAL;
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master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
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master->setup = fsl_espi_setup;
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master->cleanup = fsl_espi_cleanup;
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