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Diffstat (limited to 'drivers/i2c/mvtwsi.c')
-rw-r--r--drivers/i2c/mvtwsi.c28
1 files changed, 5 insertions, 23 deletions
diff --git a/drivers/i2c/mvtwsi.c b/drivers/i2c/mvtwsi.c
index 90c8387..5ba0e03 100644
--- a/drivers/i2c/mvtwsi.c
+++ b/drivers/i2c/mvtwsi.c
@@ -216,21 +216,7 @@ static int twsi_stop(int status)
*/
#define TWSI_FREQUENCY(m, n) \
- ((u8) (CONFIG_SYS_TCLK / (10 * (m + 1) * 2 * (1 << n))))
-
-/*
- * These are required to be reprogrammed before enabling the controller
- * because a reset loses them.
- * Default values come from the spec, but a twsi_reset will change them.
- * twsi_slave_address left uninitialized lest checkpatch.pl complains.
- */
-
-/* Baudrate generator: m (bits 7..4) =4, n (bits 3..0) =4 */
-static u8 twsi_baud_rate = 0x44; /* baudrate at controller reset */
-/* Default frequency corresponding to default m=4, n=4 */
-static u8 twsi_actual_speed = TWSI_FREQUENCY(4, 4);
-/* Default slave address is 0 (so is an uninitialized static) */
-static u8 twsi_slave_address;
+ (CONFIG_SYS_TCLK / (10 * (m + 1) * (1 << n)))
/*
* Reset controller.
@@ -238,7 +224,7 @@ static u8 twsi_slave_address;
* Controller reset also resets the baud rate and slave address, so
* re-establish them.
*/
-static void twsi_reset(void)
+static void twsi_reset(u8 baud_rate, u8 slave_address)
{
/* ensure controller will be enabled by any twsi*() function */
twsi_control_flags = MVTWSI_CONTROL_TWSIEN;
@@ -247,9 +233,9 @@ static void twsi_reset(void)
/* wait 2 ms -- this is what the Marvell LSP does */
udelay(20000);
/* set baud rate */
- writel(twsi_baud_rate, &twsi->baudrate);
+ writel(baud_rate, &twsi->baudrate);
/* set slave address even though we don't use it */
- writel(twsi_slave_address, &twsi->slave_address);
+ writel(slave_address, &twsi->slave_address);
writel(0, &twsi->xtnd_slave_addr);
/* assert STOP but don't care for the result */
(void) twsi_stop(0);
@@ -277,12 +263,8 @@ void i2c_init(int requested_speed, int slaveadd)
}
}
}
- /* save baud rate and slave for later calls to twsi_reset */
- twsi_baud_rate = baud;
- twsi_actual_speed = highest_speed;
- twsi_slave_address = slaveadd;
/* reset controller */
- twsi_reset();
+ twsi_reset(baud, slaveadd);
}
/*