diff options
Diffstat (limited to 'drivers/spi/tegra114_spi.c')
| -rw-r--r-- | drivers/spi/tegra114_spi.c | 40 |
1 files changed, 22 insertions, 18 deletions
diff --git a/drivers/spi/tegra114_spi.c b/drivers/spi/tegra114_spi.c index 4bec66309e..d7eecd5bc6 100644 --- a/drivers/spi/tegra114_spi.c +++ b/drivers/spi/tegra114_spi.c @@ -143,24 +143,30 @@ static int tegra114_spi_probe(struct udevice *bus) { struct tegra_spi_platdata *plat = dev_get_platdata(bus); struct tegra114_spi_priv *priv = dev_get_priv(bus); + struct spi_regs *regs; + ulong rate; priv->regs = (struct spi_regs *)plat->base; + regs = priv->regs; priv->last_transaction_us = timer_get_us(); priv->freq = plat->frequency; priv->periph_id = plat->periph_id; - return 0; -} - -static int tegra114_spi_claim_bus(struct udevice *dev) -{ - struct udevice *bus = dev->parent; - struct tegra114_spi_priv *priv = dev_get_priv(bus); - struct spi_regs *regs = priv->regs; - - /* Change SPI clock to correct frequency, PLLP_OUT0 source */ - clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH, priv->freq); + /* + * Change SPI clock to correct frequency, PLLP_OUT0 source, falling + * back to the oscillator if that is too fast. + */ + rate = clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH, + priv->freq); + if (rate > priv->freq + 100000) { + rate = clock_start_periph_pll(priv->periph_id, CLOCK_ID_OSC, + priv->freq); + if (rate != priv->freq) { + printf("Warning: SPI '%s' requested clock %u, actual clock %lu\n", + bus->name, priv->freq, rate); + } + } /* Clear stale status here */ setbits_le32(®s->fifo_status, @@ -175,9 +181,8 @@ static int tegra114_spi_claim_bus(struct udevice *dev) SPI_FIFO_STS_RX_FIFO_EMPTY); debug("%s: FIFO STATUS = %08x\n", __func__, readl(®s->fifo_status)); - /* Set master mode and sw controlled CS */ - setbits_le32(®s->command1, SPI_CMD1_M_S | SPI_CMD1_CS_SW_HW | - (priv->mode << SPI_CMD1_MODE_SHIFT)); + setbits_le32(&priv->regs->command1, SPI_CMD1_M_S | SPI_CMD1_CS_SW_HW | + (priv->mode << SPI_CMD1_MODE_SHIFT) | SPI_CMD1_CS_SW_VAL); debug("%s: COMMAND1 = %08x\n", __func__, readl(®s->command1)); return 0; @@ -249,6 +254,9 @@ static int tegra114_spi_xfer(struct udevice *dev, unsigned int bitlen, ret = 0; + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(dev); + /* clear all error status bits */ reg = readl(®s->fifo_status); writel(reg, ®s->fifo_status); @@ -260,9 +268,6 @@ static int tegra114_spi_xfer(struct udevice *dev, unsigned int bitlen, /* set xfer size to 1 block (32 bits) */ writel(0, ®s->dma_blk); - if (flags & SPI_XFER_BEGIN) - spi_cs_activate(dev); - /* handle data in 32-bit chunks */ while (num_bytes > 0) { int bytes; @@ -385,7 +390,6 @@ static int tegra114_spi_set_mode(struct udevice *bus, uint mode) } static const struct dm_spi_ops tegra114_spi_ops = { - .claim_bus = tegra114_spi_claim_bus, .xfer = tegra114_spi_xfer, .set_speed = tegra114_spi_set_speed, .set_mode = tegra114_spi_set_mode, |