Add locking to the various iicbus(4) bridge drivers:

- Just grab Giant in the ixp425_iic(4) driver since this driver uses
  a shared address/data register window pair to access the actual
  I2C registers.  None of the other ixp425 drivers lock access to these
  shared address/data registers yet and that would need to be done before
  this could use any meaningful locking.
- Add locking to the interrupt handler and 'iicbus_reset' methods of the
  at91_twi(4) driver.
- Add locking to the pcf(4) driver.  Other pcf(4) fixes include:
  - Don't needlessly zero the softc.
  - Use bus_foo rather than bus_space_foo and remove bus space tag and
    handle from softc.
- The lpbb(4) driver just grabs Giant for now.  This will be refined later
  when ppbus(4) is locked.
- As was done with smbus earlier, move the DRIVER_MODULE() lines to match
  the bus driver (either iicbus or iicbb) to the bridge driver into the
  bridge drivers.

Tested by:	sam (arm/ixp425)

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/dev/bktr/bktr_i2c.c b/sys/dev/bktr/bktr_i2c.c
index 0d733c0..4032258 100644
--- a/sys/dev/bktr/bktr_i2c.c
+++ b/sys/dev/bktr/bktr_i2c.c
@@ -356,6 +356,7 @@ bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
 	return (0);
 }
 
+DRIVER_MODULE(iicbb, bktr, iicbb_driver, iicbb_devclass, 0, 0);
 DRIVER_MODULE(smbus, bktr, smbus_driver, smbus_devclass, 0, 0);
 
 #endif /* defined(BKTR_USE_FREEBSD_SMBUS) */