powerpc/pseries: Move hvsi support into a library

This will allow a different backend to share it

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/hvsi.h

@@ -56,5 +56,39 @@ struct hvsi_query_response {
 	} u;
 } __attribute__((packed));
 
+/* hvsi lib struct definitions */
+#define HVSI_INBUF_SIZE		255
+struct tty_struct;
+struct hvsi_priv {
+	unsigned int	inbuf_len;	/* data in input buffer */
+	unsigned char	inbuf[HVSI_INBUF_SIZE];
+	unsigned int	inbuf_cur;	/* Cursor in input buffer */
+	unsigned int	inbuf_pktlen;	/* packet lenght from cursor */
+	atomic_t	seqno;		/* packet sequence number */
+	unsigned int	opened:1;	/* driver opened */
+	unsigned int	established:1;	/* protocol established */
+	unsigned int 	is_console:1;	/* used as a kernel console device */
+	unsigned int	mctrl_update:1;	/* modem control updated */
+	unsigned short	mctrl;		/* modem control */
+	struct tty_struct *tty;		/* tty structure */
+	int (*get_chars)(uint32_t termno, char *buf, int count);
+	int (*put_chars)(uint32_t termno, const char *buf, int count);
+	uint32_t	termno;
+};
+
+/* hvsi lib functions */
+struct hvc_struct;
+extern void hvsi_init(struct hvsi_priv *pv,
+		      int (*get_chars)(uint32_t termno, char *buf, int count),
+		      int (*put_chars)(uint32_t termno, const char *buf,
+				       int count),
+		      int termno, int is_console);
+extern int hvsi_open(struct hvsi_priv *pv, struct hvc_struct *hp);
+extern void hvsi_close(struct hvsi_priv *pv, struct hvc_struct *hp);
+extern int hvsi_read_mctrl(struct hvsi_priv *pv);
+extern int hvsi_write_mctrl(struct hvsi_priv *pv, int dtr);
+extern void hvsi_establish(struct hvsi_priv *pv);
+extern int hvsi_get_chars(struct hvsi_priv *pv, char *buf, int count);
+extern int hvsi_put_chars(struct hvsi_priv *pv, const char *buf, int count);
 
 #endif /* _HVSI_H */

drivers/tty/hvc/Makefile

@@ -1,4 +1,4 @@
-obj-$(CONFIG_HVC_CONSOLE)	+= hvc_vio.o
+obj-$(CONFIG_HVC_CONSOLE)	+= hvc_vio.o hvsi_lib.o
 obj-$(CONFIG_HVC_OLD_HVSI)	+= hvsi.o
 obj-$(CONFIG_HVC_ISERIES)	+= hvc_iseries.o
 obj-$(CONFIG_HVC_RTAS)		+= hvc_rtas.o