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Subject[PATCH v2 5/6] spi: sun4i: introduce register set/unset helpers
Date
Two helper functions were added in order to set/unset
specified flags in registers.

Signed-off-by: Sergey Suloev <ssuloev@orpaltech.com>
---
drivers/spi/spi-sun4i.c | 40 +++++++++++++++++++---------------------
1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index 9d1bc20..d81d31c 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -107,29 +107,29 @@ static inline void sun4i_spi_write(struct sun4i_spi *sspi, u32 reg, u32 value)
writel(value, sspi->base_addr + reg);
}

-static inline u32 sun4i_spi_get_tx_fifo_count(struct sun4i_spi *sspi)
+static inline void sun4i_spi_set(struct sun4i_spi *sspi, u32 addr, u32 val)
{
- u32 reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG);
-
- reg >>= SUN4I_FIFO_STA_TF_CNT_BITS;
+ u32 reg = sun4i_spi_read(sspi, addr);

- return reg & SUN4I_FIFO_STA_TF_CNT_MASK;
+ reg |= val;
+ sun4i_spi_write(sspi, addr, reg);
}

-static inline void sun4i_spi_enable_interrupt(struct sun4i_spi *sspi, u32 mask)
+static inline void sun4i_spi_unset(struct sun4i_spi *sspi, u32 addr, u32 val)
{
- u32 reg = sun4i_spi_read(sspi, SUN4I_INT_CTL_REG);
+ u32 reg = sun4i_spi_read(sspi, addr);

- reg |= mask;
- sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, reg);
+ reg &= ~val;
+ sun4i_spi_write(sspi, addr, reg);
}

-static inline void sun4i_spi_disable_interrupt(struct sun4i_spi *sspi, u32 mask)
+static inline u32 sun4i_spi_get_tx_fifo_count(struct sun4i_spi *sspi)
{
- u32 reg = sun4i_spi_read(sspi, SUN4I_INT_CTL_REG);
+ u32 reg = sun4i_spi_read(sspi, SUN4I_FIFO_STA_REG);

- reg &= ~mask;
- sun4i_spi_write(sspi, SUN4I_INT_CTL_REG, reg);
+ reg >>= SUN4I_FIFO_STA_TF_CNT_BITS;
+
+ return reg & SUN4I_FIFO_STA_TF_CNT_MASK;
}

static inline void sun4i_spi_drain_fifo(struct sun4i_spi *sspi, int len)
@@ -256,13 +256,12 @@ static int sun4i_spi_transfer_one(struct spi_master *master,
/* Clear pending interrupts */
sun4i_spi_write(sspi, SUN4I_INT_STA_REG, ~0);

+ /* Reset FIFOs */
+ sun4i_spi_set(sspi, SUN4I_CTL_REG,
+ SUN4I_CTL_RF_RST | SUN4I_CTL_TF_RST);

reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);

- /* Reset FIFOs */
- sun4i_spi_write(sspi, SUN4I_CTL_REG,
- reg | SUN4I_CTL_RF_RST | SUN4I_CTL_TF_RST);
-
/*
* Setup the transfer control register: Chip Select,
* polarities, etc.
@@ -342,12 +341,11 @@ static int sun4i_spi_transfer_one(struct spi_master *master,
sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH);

/* Enable the interrupts */
- sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TC |
- SUN4I_INT_CTL_RF_F34);
+ sun4i_spi_set(sspi, SUN4I_INT_CTL_REG, SUN4I_INT_CTL_TC |
+ SUN4I_INT_CTL_RF_F34);

/* Start the transfer */
- reg = sun4i_spi_read(sspi, SUN4I_CTL_REG);
- sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH);
+ sun4i_spi_set(sspi, SUN4I_CTL_REG, SUN4I_CTL_XCH);

ret = sun4i_spi_wait_for_transfer(spi, tfr);

--
2.16.2
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