[PATCH 05/13] i2c: nomadik: simplify IRQ masking logic

Théo Lebrun
2024-02-15T16:52:38Z

IRQ_MASK and I2C_CLEAR_ALL_INTS are redundant. One masks the top three
bits off as reserved, the other one masks the reserved IRQs inside the
u32. Get rid of IRQ_MASK and only use the most restrictive mask.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
---
drivers/i2c/busses/i2c-nomadik.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index cd511c884f99..80bdf7e42613 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -94,9 +94,6 @@
/* some bits in ICR are reserved */
#define I2C_CLEAR_ALL_INTS 0x131f007f

-/* first three msb bits are reserved */
-#define IRQ_MASK(mask) (mask & 0x1fffffff)
-
/* maximum threshold value */
#define MAX_I2C_FIFO_THRESHOLD 15

@@ -249,8 +246,7 @@ static int flush_i2c_fifo(struct nmk_i2c_dev *priv)
*/
static void disable_all_interrupts(struct nmk_i2c_dev *priv)
{
- u32 mask = IRQ_MASK(0);
- writel(mask, priv->virtbase + I2C_IMSCR);
+ writel(0, priv->virtbase + I2C_IMSCR);
}

/**
@@ -259,9 +255,7 @@ static void disable_all_interrupts(struct nmk_i2c_dev *priv)
*/
static void clear_all_interrupts(struct nmk_i2c_dev *priv)
{
- u32 mask;
- mask = IRQ_MASK(I2C_CLEAR_ALL_INTS);
- writel(mask, priv->virtbase + I2C_ICR);
+ writel(I2C_CLEAR_ALL_INTS, priv->virtbase + I2C_ICR);
}

/**
@@ -468,7 +462,7 @@ static int read_i2c(struct nmk_i2c_dev *priv, u16 flags)
else
irq_mask |= I2C_IT_MTDWS;

- irq_mask = I2C_CLEAR_ALL_INTS & IRQ_MASK(irq_mask);
+ irq_mask &= I2C_CLEAR_ALL_INTS;

writel(readl(priv->virtbase + I2C_IMSCR) | irq_mask,
priv->virtbase + I2C_IMSCR);
@@ -547,7 +541,7 @@ static int write_i2c(struct nmk_i2c_dev *priv, u16 flags)
else
irq_mask |= I2C_IT_MTDWS;

- irq_mask = I2C_CLEAR_ALL_INTS & IRQ_MASK(irq_mask);
+ irq_mask &= I2C_CLEAR_ALL_INTS;

writel(readl(priv->virtbase + I2C_IMSCR) | irq_mask,
priv->virtbase + I2C_IMSCR);
@@ -703,8 +697,8 @@ static int nmk_i2c_xfer(struct i2c_adapter *i2c_adap,
*/
static int disable_interrupts(struct nmk_i2c_dev *priv, u32 irq)
{
- irq = IRQ_MASK(irq);
- writel(readl(priv->virtbase + I2C_IMSCR) & ~(I2C_CLEAR_ALL_INTS & irq),
+ irq &= I2C_CLEAR_ALL_INTS;
+ writel(readl(priv->virtbase + I2C_IMSCR) & ~irq,
priv->virtbase + I2C_IMSCR);
return 0;
}

--
2.43.1