mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
0c176fa80f
Add serial console support for non-OF systems. There is a generic serial console layer which calls a serial console driver. Included is the serial console driver for the ns16550 class of uarts. Necessary support routines are added as well. Signed-off-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#ifndef _IO_H
|
|
#define __IO_H
|
|
/*
|
|
* Low-level I/O routines.
|
|
*
|
|
* Copied from <file:include/asm-powerpc/io.h> (which has no copyright)
|
|
*/
|
|
static inline int in_8(const volatile unsigned char *addr)
|
|
{
|
|
int ret;
|
|
|
|
__asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
|
|
: "=r" (ret) : "m" (*addr));
|
|
return ret;
|
|
}
|
|
|
|
static inline void out_8(volatile unsigned char *addr, int val)
|
|
{
|
|
__asm__ __volatile__("stb%U0%X0 %1,%0; sync"
|
|
: "=m" (*addr) : "r" (val));
|
|
}
|
|
|
|
static inline unsigned in_le32(const volatile unsigned *addr)
|
|
{
|
|
unsigned ret;
|
|
|
|
__asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
|
|
: "=r" (ret) : "r" (addr), "m" (*addr));
|
|
return ret;
|
|
}
|
|
|
|
static inline unsigned in_be32(const volatile unsigned *addr)
|
|
{
|
|
unsigned ret;
|
|
|
|
__asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
|
|
: "=r" (ret) : "m" (*addr));
|
|
return ret;
|
|
}
|
|
|
|
static inline void out_le32(volatile unsigned *addr, int val)
|
|
{
|
|
__asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
|
|
: "r" (val), "r" (addr));
|
|
}
|
|
|
|
static inline void out_be32(volatile unsigned *addr, int val)
|
|
{
|
|
__asm__ __volatile__("stw%U0%X0 %1,%0; sync"
|
|
: "=m" (*addr) : "r" (val));
|
|
}
|
|
|
|
#endif /* _IO_H */
|