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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2020-10-08 02:54:59 +0300
committerMark Brown <broonie@kernel.org>2020-10-09 01:00:13 +0300
commit82d02944d238a6fdac729d135623b1d88ca8cbd6 (patch)
treef92956081f49bc7fc44e44b75c401949c139f0bc /drivers/spi
parentddcc2733c1591c137f7ce60f24ba5401c295427f (diff)
downloadlinux-82d02944d238a6fdac729d135623b1d88ca8cbd6.tar.xz
spi: dw: Perform IRQ setup in a dedicated function
In order to make the transfer_one() callback method more readable and for unification with the DMA-based transfer, let's detach the IRQ setup procedure into a dedicated function. While at it rename the IRQ-based transfer handler function to be dw_spi-prefixe and looking more like the DMA-related one. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Link: https://lore.kernel.org/r/20201007235511.4935-11-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-dw-core.c41
1 files changed, 23 insertions, 18 deletions
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 4a45610c85f1..e7ffcfff6594 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -178,7 +178,7 @@ static void int_error_stop(struct dw_spi *dws, const char *msg)
spi_finalize_current_transfer(dws->master);
}
-static irqreturn_t interrupt_transfer(struct dw_spi *dws)
+static irqreturn_t dw_spi_transfer_handler(struct dw_spi *dws)
{
u16 irq_status = dw_readl(dws, DW_SPI_ISR);
@@ -315,6 +315,27 @@ void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
}
EXPORT_SYMBOL_GPL(dw_spi_update_config);
+static void dw_spi_irq_setup(struct dw_spi *dws)
+{
+ u16 level;
+ u8 imask;
+
+ /*
+ * Originally Tx and Rx data lengths match. Rx FIFO Threshold level
+ * will be adjusted at the final stage of the IRQ-based SPI transfer
+ * execution so not to lose the leftover of the incoming data.
+ */
+ level = min_t(u16, dws->fifo_len / 2, dws->tx_len);
+ dw_writel(dws, DW_SPI_TXFTLR, level);
+ dw_writel(dws, DW_SPI_RXFTLR, level - 1);
+
+ imask = SPI_INT_TXEI | SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI |
+ SPI_INT_RXFI;
+ spi_umask_intr(dws, imask);
+
+ dws->transfer_handler = dw_spi_transfer_handler;
+}
+
static int dw_spi_transfer_one(struct spi_controller *master,
struct spi_device *spi, struct spi_transfer *transfer)
{
@@ -324,8 +345,6 @@ static int dw_spi_transfer_one(struct spi_controller *master,
.dfs = transfer->bits_per_word,
.freq = transfer->speed_hz,
};
- u8 imask = 0;
- u16 txlevel = 0;
int ret;
dws->dma_mapped = 0;
@@ -358,21 +377,7 @@ static int dw_spi_transfer_one(struct spi_controller *master,
return ret;
}
} else {
- /*
- * Originally Tx and Rx data lengths match. Rx FIFO Threshold level
- * will be adjusted at the final stage of the IRQ-based SPI transfer
- * execution so not to lose the leftover of the incoming data.
- */
- txlevel = min_t(u16, dws->fifo_len / 2, dws->tx_len);
- dw_writel(dws, DW_SPI_TXFTLR, txlevel);
- dw_writel(dws, DW_SPI_RXFTLR, txlevel - 1);
-
- /* Set the interrupt mask */
- imask |= SPI_INT_TXEI | SPI_INT_TXOI |
- SPI_INT_RXUI | SPI_INT_RXOI | SPI_INT_RXFI;
- spi_umask_intr(dws, imask);
-
- dws->transfer_handler = interrupt_transfer;
+ dw_spi_irq_setup(dws);
}
spi_enable_chip(dws, 1);