diff options
Diffstat (limited to 'drivers/spi/spi-synquacer.c')
| -rw-r--r-- | drivers/spi/spi-synquacer.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c index ce558c4..0cae3df 100644 --- a/drivers/spi/spi-synquacer.c +++ b/drivers/spi/spi-synquacer.c @@ -45,8 +45,11 @@ #define RXF 0x20 #define RXE 0x24 #define RXC 0x28 +#define TFES 1 #define TFLETE 4 +#define TSSRS 6 #define RFMTE 5 +#define RSSRS 6 #define FAULTF 0x2c #define FAULTC 0x30 @@ -170,6 +173,11 @@ static void synquacer_cs_set(struct synquacer_spi_priv *priv, bool active) priv->rx_words = 16; read_fifo(priv); } + + /* wait until slave is deselected */ + while (!(readl(priv->base + TXF) & BIT(TSSRS)) || + !(readl(priv->base + RXF) & BIT(RSSRS))) + ; } } @@ -275,7 +283,7 @@ static int synquacer_spi_xfer(struct udevice *dev, unsigned int bitlen, { struct udevice *bus = dev->parent; struct synquacer_spi_priv *priv = dev_get_priv(bus); - u32 val, words, busy; + u32 val, words, busy = 0; val = readl(priv->base + FIFOCFG); val |= (1 << RX_FLUSH); @@ -323,9 +331,11 @@ static int synquacer_spi_xfer(struct udevice *dev, unsigned int bitlen, writel(~0, priv->base + RXC); /* Trigger */ - val = readl(priv->base + DMSTART); - val |= BIT(TRIGGER); - writel(val, priv->base + DMSTART); + if (flags & SPI_XFER_BEGIN) { + val = readl(priv->base + DMSTART); + val |= BIT(TRIGGER); + writel(val, priv->base + DMSTART); + } while (busy & (BIT(RXBIT) | BIT(TXBIT))) { if (priv->rx_words) @@ -336,13 +346,10 @@ static int synquacer_spi_xfer(struct udevice *dev, unsigned int bitlen, if (priv->tx_words) { write_fifo(priv); } else { - u32 len; - - do { /* wait for shifter to empty out */ + /* wait for shifter to empty out */ + while (!(readl(priv->base + TXF) & BIT(TFES))) cpu_relax(); - len = readl(priv->base + DMSTATUS); - len = (len >> TX_DATA_SHIFT) & TX_DATA_MASK; - } while (tx_buf && len); + busy &= ~BIT(TXBIT); } } |