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i2c: octeon: Add flush writeq helper function

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Add helper function that reads back a value after writing to
make sure the write is finished and use it in octeon_i2c_write_int().

Signed-off-by: Peter Swain <pswain@cavium.com>
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Peter Swain 2016-04-25 16:33:33 +02:00 committed by Wolfram Sang
parent c981e34eee
commit 30c24b2514
1 changed files with 7 additions and 2 deletions
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9
drivers/i2c/busses/i2c-octeon.c
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@ -103,6 +103,12 @@ struct octeon_i2c {
struct device *dev;
};
static void octeon_i2c_writeq_flush(u64 val, void __iomem *addr)
{
__raw_writeq(val, addr);
__raw_readq(addr); /* wait for write to land */
}
/**
* octeon_i2c_reg_write - write an I2C core register
* @i2c: The struct octeon_i2c
@ -172,8 +178,7 @@ static u64 octeon_i2c_read_int(struct octeon_i2c *i2c)
*/
static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
{
__raw_writeq(data, i2c->twsi_base + TWSI_INT);
__raw_readq(i2c->twsi_base + TWSI_INT);
octeon_i2c_writeq_flush(data, i2c->twsi_base + TWSI_INT);
}
/**