diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/xilinx_spi.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c index 11b7343eb2..8621738b76 100644 --- a/drivers/spi/xilinx_spi.c +++ b/drivers/spi/xilinx_spi.c @@ -105,6 +105,7 @@ struct xilinx_spi_priv { unsigned int freq; unsigned int mode; unsigned int fifo_depth; + u8 startup; }; static int xilinx_spi_probe(struct udevice *bus) @@ -205,6 +206,39 @@ static u32 xilinx_spi_read_rxfifo(struct udevice *bus, u8 *rxp, u32 rxbytes) return i; } +static void xilinx_spi_startup_block(struct udevice *dev, unsigned int bytes, + const void *dout, void *din) +{ + struct udevice *bus = dev_get_parent(dev); + struct xilinx_spi_priv *priv = dev_get_priv(bus); + struct xilinx_spi_regs *regs = priv->regs; + struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev); + const unsigned char *txp = dout; + unsigned char *rxp = din; + u32 reg, count; + u32 txbytes = bytes; + u32 rxbytes = bytes; + + /* + * This loop runs two times. First time to send the command. + * Second time to transfer data. After transferring data, + * it sets txp to the initial value for the normal operation. + */ + for ( ; priv->startup < 2; priv->startup++) { + count = xilinx_spi_fill_txfifo(bus, txp, txbytes); + reg = readl(®s->spicr) & ~SPICR_MASTER_INHIBIT; + writel(reg, ®s->spicr); + count = xilinx_spi_read_rxfifo(bus, rxp, rxbytes); + txp = din; + + if (priv->startup) { + spi_cs_deactivate(dev); + spi_cs_activate(dev, slave_plat->cs); + txp = dout; + } + } +} + static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { @@ -237,6 +271,13 @@ static int xilinx_spi_xfer(struct udevice *dev, unsigned int bitlen, if (flags & SPI_XFER_BEGIN) spi_cs_activate(dev, slave_plat->cs); + /* + * This is the work around for the startup block issue in + * the spi controller. SPI clock is passing through STARTUP + * block to FLASH. STARTUP block don't provide clock as soon + * as QSPI provides command. So first command fails. + */ + xilinx_spi_startup_block(dev, bytes, dout, din); while (txbytes && rxbytes) { count = xilinx_spi_fill_txfifo(bus, txp, txbytes); |