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, 14 insertions, 7 deletions

diff --git a/sys/dev/uart/uart_cpu_amd64.c b/sys/dev/uart/uart_cpu_amd64.c
index a186216..1852d40 100644
--- a/sys/dev/uart/uart_cpu_amd64.c
+++ b/sys/dev/uart/uart_cpu_amd64.c
@@ -36,6 +36,20 @@ __FBSDID("$FreeBSD$");
 #include <dev/uart/uart.h>
 #include <dev/uart/uart_cpu.h>
 
+bus_addr_t
+uart_cpu_busaddr(struct uart_bas *bas)
+{
+
+	return (bas->bsh);
+}
+
+int
+uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
+{
+
+	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
+}
+
 int
 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 {
@@ -83,10 +97,3 @@ uart_cpu_getdev(int devtype, struct uart_devinfo *di)
 
 	return (ENXIO);
 }
-
-int
-uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
-{
-
-	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
-}