static int spi_qup_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct spi_qup *controller = spi_master_get_devdata(master);
unsigned long timeout, flags;
int ret = -EIO;
ret = spi_qup_io_config(spi, xfer);
if (ret)
return ret;
timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC);
timeout = DIV_ROUND_UP(xfer->len * 8, timeout);
timeout = 100 * msecs_to_jiffies(timeout);
reinit_completion(&controller->done);
spin_lock_irqsave(&controller->lock, flags);
controller->xfer = xfer;
controller->error = 0;
controller->rx_bytes = 0;
controller->tx_bytes = 0;
spin_unlock_irqrestore(&controller->lock, flags);
if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
dev_warn(controller->dev, "cannot set RUN state\n");
goto exit;
}
if (spi_qup_set_state(controller, QUP_STATE_PAUSE)) {
dev_warn(controller->dev, "cannot set PAUSE state\n");
goto exit;
}
spi_qup_fifo_write(controller, xfer);
if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
dev_warn(controller->dev, "cannot set EXECUTE state\n");
goto exit;
}
if (!wait_for_completion_timeout(&controller->done, timeout))
ret = -ETIMEDOUT;
exit:
spi_qup_set_state(controller, QUP_STATE_RESET);
spin_lock_irqsave(&controller->lock, flags);
controller->xfer = NULL;
if (!ret)
ret = controller->error;
spin_unlock_irqrestore(&controller->lock, flags);
return ret;
}
static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer)
{
struct spi_qup *qup = spi_master_get_devdata(master);
int ret;
ret = spi_qup_set_state(qup, QUP_STATE_RUN);
if (ret) {
dev_warn(qup->dev, "cannot set RUN state\n");
return ret;
}
ret = spi_qup_set_state(qup, QUP_STATE_PAUSE);
if (ret) {
dev_warn(qup->dev, "cannot set PAUSE state\n");
return ret;
}
spi_qup_fifo_write(qup, xfer);
return 0;
}
static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
{
struct spi_qup *controller = dev_id;
struct spi_transfer *xfer;
u32 opflags, qup_err, spi_err;
unsigned long flags;
int error = 0;
spin_lock_irqsave(&controller->lock, flags);
xfer = controller->xfer;
controller->xfer = NULL;
spin_unlock_irqrestore(&controller->lock, flags);
qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS);
spi_err = readl_relaxed(controller->base + SPI_ERROR_FLAGS);
opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);
writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS);
writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
if (!xfer) {
dev_err_ratelimited(controller->dev, "unexpected irq %08x %08x %08x\n",
qup_err, spi_err, opflags);
return IRQ_HANDLED;
}
if (qup_err) {
if (qup_err & QUP_ERROR_OUTPUT_OVER_RUN)
dev_warn(controller->dev, "OUTPUT_OVER_RUN\n");
if (qup_err & QUP_ERROR_INPUT_UNDER_RUN)
dev_warn(controller->dev, "INPUT_UNDER_RUN\n");
if (qup_err & QUP_ERROR_OUTPUT_UNDER_RUN)
dev_warn(controller->dev, "OUTPUT_UNDER_RUN\n");
if (qup_err & QUP_ERROR_INPUT_OVER_RUN)
dev_warn(controller->dev, "INPUT_OVER_RUN\n");
error = -EIO;
}
if (spi_err) {
if (spi_err & SPI_ERROR_CLK_OVER_RUN)
dev_warn(controller->dev, "CLK_OVER_RUN\n");
if (spi_err & SPI_ERROR_CLK_UNDER_RUN)
dev_warn(controller->dev, "CLK_UNDER_RUN\n");
error = -EIO;
}
if (!controller->use_dma) {
if (opflags & QUP_OP_IN_SERVICE_FLAG)
spi_qup_fifo_read(controller, xfer);
if (opflags & QUP_OP_OUT_SERVICE_FLAG)
spi_qup_fifo_write(controller, xfer);
}
spin_lock_irqsave(&controller->lock, flags);
controller->error = error;
controller->xfer = xfer;
spin_unlock_irqrestore(&controller->lock, flags);
if (controller->rx_bytes == xfer->len || error)
complete(&controller->done);
return IRQ_HANDLED;
}
