NAME
read_zsreg - Read a register from a Z85230
SYNOPSIS
u8 read_zsreg (struct z8530_channel *c, u8 reg);
ARGUMENTS
c Z8530 channel to read from (2 per chip)
reg Register to read
FIXME
Use a spinlock.
Most of the Z8530 registers are indexed off the control registers. A
read is done by writing to the control register and reading the
register back. The caller must hold the lock