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spi: spi-sun6i: sun6i_spi_drain_fifo(): introduce sun6i_spi_get_rx_fifo_count() and make use of it

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This patch introduces the function sun6i_spi_get_rx_fifo_count(), similar to
the existing sun6i_spi_get_tx_fifo_count(), to make the sun6i_spi_drain_fifo()
function a bit easier to read.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20200706143443.9855-7-mkl@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marc Kleine-Budde 2020-07-06 16:34:39 +02:00 committed by Mark Brown
parent 9a3ef9df22
commit 5197da0363
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 10 additions and 6 deletions
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16
drivers/spi/spi-sun6i.c
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@ -59,8 +59,7 @@
#define SUN6I_FIFO_CTL_TF_RST BIT(31)
#define SUN6I_FIFO_STA_REG 0x1c
#define SUN6I_FIFO_STA_RF_CNT_MASK 0x7f
#define SUN6I_FIFO_STA_RF_CNT_BITS 0
#define SUN6I_FIFO_STA_RF_CNT_MASK GENMASK(7, 0)
#define SUN6I_FIFO_STA_TF_CNT_MASK GENMASK(23, 16)
#define SUN6I_CLK_CTL_REG 0x24
@ -106,6 +105,13 @@ static inline void sun6i_spi_write(struct sun6i_spi *sspi, u32 reg, u32 value)
writel(value, sspi->base_addr + reg);
}
static inline u32 sun6i_spi_get_rx_fifo_count(struct sun6i_spi *sspi)
{
u32 reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG);
return FIELD_GET(SUN6I_FIFO_STA_RF_CNT_MASK, reg);
}
static inline u32 sun6i_spi_get_tx_fifo_count(struct sun6i_spi *sspi)
{
u32 reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG);
@ -131,13 +137,11 @@ static inline void sun6i_spi_disable_interrupt(struct sun6i_spi *sspi, u32 mask)
static inline void sun6i_spi_drain_fifo(struct sun6i_spi *sspi, int len)
{
u32 reg, cnt;
u32 cnt;
u8 byte;
/* See how much data is available */
reg = sun6i_spi_read(sspi, SUN6I_FIFO_STA_REG);
reg &= SUN6I_FIFO_STA_RF_CNT_MASK;
cnt = reg >> SUN6I_FIFO_STA_RF_CNT_BITS;
cnt = sun6i_spi_get_rx_fifo_count(sspi);
if (len > cnt)
len = cnt;