Remove the assumption that a bus_space_handle_t is an I/O address

from the SAB82532 and the Z8530 hardware drivers by introducing
uart_cpu_busaddr(). The assumption is not true on pc98 where
bus_space_handle_t is a pointer to a structure.
The uart_cpu_busaddr() function will return the bus address
corresponding the tag and handle given to it by the BAS.

WARNING: the intend of the function is STRICTLY to allow hardware
drivers to determine which logical channel they control and is NOT
to be used for actual I/O. It is therefore EXPLICITLY allowed that
uart_cpu_busaddr() returns only the lower 8 bits of the address
and garbage in all other bits. No mistakes...

1 files changed, 3 insertions, 2 deletions

diff --git a/sys/dev/uart/uart_cpu.h b/sys/dev/uart/uart_cpu.h
index f10e4dd..e60ce57 100644
--- a/sys/dev/uart/uart_cpu.h
+++ b/sys/dev/uart/uart_cpu.h
@@ -67,8 +67,9 @@ struct uart_devinfo {
 	void	*cookie;		/* Type dependent use. */
 };
 
-int uart_cpu_getdev(int devtype, struct uart_devinfo *di);
-int uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2);
+bus_addr_t uart_cpu_busaddr(struct uart_bas *);
+int uart_cpu_eqres(struct uart_bas *, struct uart_bas *);
+int uart_cpu_getdev(int, struct uart_devinfo *);
 
 void uart_add_sysdev(struct uart_devinfo*);