diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-ti-qspi.c | 54 |
1 files changed, 51 insertions, 3 deletions
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c index 0334e2926998..858fda8ac73e 100644 --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -314,6 +314,8 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, { int wlen; unsigned int cmd; + u32 rx; + u8 rxlen, rx_wlen; u8 *rxbuf; rxbuf = t->rx_buf; @@ -336,14 +338,60 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, if (qspi_is_busy(qspi)) return -EBUSY; + switch (wlen) { + case 1: + /* + * Optimize the 8-bit words transfers, as used by + * the SPI flash devices. + */ + if (count >= QSPI_WLEN_MAX_BYTES) { + rxlen = QSPI_WLEN_MAX_BYTES; + } else { + rxlen = min(count, 4); + } + rx_wlen = rxlen << 3; + cmd &= ~QSPI_WLEN_MASK; + cmd |= QSPI_WLEN(rx_wlen); + break; + default: + rxlen = wlen; + break; + } + ti_qspi_write(qspi, cmd, QSPI_SPI_CMD_REG); if (ti_qspi_poll_wc(qspi)) { dev_err(qspi->dev, "read timed out\n"); return -ETIMEDOUT; } + switch (wlen) { case 1: - *rxbuf = readb(qspi->base + QSPI_SPI_DATA_REG); + /* + * Optimize the 8-bit words transfers, as used by + * the SPI flash devices. + */ + if (count >= QSPI_WLEN_MAX_BYTES) { + u32 *rxp = (u32 *) rxbuf; + rx = readl(qspi->base + QSPI_SPI_DATA_REG_3); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG_2); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG_1); + *rxp++ = be32_to_cpu(rx); + rx = readl(qspi->base + QSPI_SPI_DATA_REG); + *rxp++ = be32_to_cpu(rx); + } else { + u8 *rxp = rxbuf; + rx = readl(qspi->base + QSPI_SPI_DATA_REG); + if (rx_wlen >= 8) + *rxp++ = rx >> (rx_wlen - 8); + if (rx_wlen >= 16) + *rxp++ = rx >> (rx_wlen - 16); + if (rx_wlen >= 24) + *rxp++ = rx >> (rx_wlen - 24); + if (rx_wlen >= 32) + *rxp++ = rx; + } break; case 2: *((u16 *)rxbuf) = readw(qspi->base + QSPI_SPI_DATA_REG); @@ -352,8 +400,8 @@ static int qspi_read_msg(struct ti_qspi *qspi, struct spi_transfer *t, *((u32 *)rxbuf) = readl(qspi->base + QSPI_SPI_DATA_REG); break; } - rxbuf += wlen; - count -= wlen; + rxbuf += rxlen; + count -= rxlen; } return 0; |