pibridge-serdev: Move definitions in new header file pibridge.h

Move structure definitions for GATE and IO packet headers as well as the
macro for the fifo size into the new header file pibridge.h.
By doing this extend the fifo size to a power of 2 since this is what the
kfifo API will extend the fifo to, anyway. Also rename the macro from
PIBRIDGE_RECV_BUFFER_SIZE to the more appropriate PIBRIDGE_RECV_FIFO_SIZE.

This is in preparation of implementing tracing macros which are defined in
a seperate header file but need access to the definitions mentioned above.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>

Author: linosanfilippo-kunbus

drivers/tty/serdev/pibridge.c

@@ -7,9 +7,10 @@
 #include <linux/pibridge_comm.h>
 #include <linux/wait.h>
 
+#include "pibridge.h"
+
 #define PIBRIDGE_BAUDRATE		115200
 #define PIBRIDGE_IO_TIMEOUT		10         // msec
-#define PIBRIDGE_RECV_BUFFER_SIZE	100
 #define PIBRIDGE_BC_ADDR		0xff
 
 #define PIBRIDGE_RESP_CMD		0x3fff
@@ -23,22 +24,6 @@ struct pibridge {
 	wait_queue_head_t read_queue;
 };
 
-struct pibridge_pkthdr_gate {
-	u8	dst;
-	u8	src;
-	u16	cmd;
-	u16	seq;
-	u8	len;
-} __attribute__((packed));
-
-struct pibridge_pkthdr_io {
-	u8 addr	:6;
-	u8 type	:1;	/* 0 for unicast, 1 for broadcast */
-	u8 rsp	:1;	/* 0 for request, 1 for response */
-	u8 len	:5;
-	u8 cmd	:3;	/* 0 for broadcast*/
-} __attribute__((packed));
-
 static struct pibridge *pibridge_s; /* unique instance of the pibridge */
 
 static u8 pibridge_crc8(u8 base, void *data, u16 len)
@@ -121,8 +106,7 @@ static int pibridge_probe(struct serdev_device *serdev)
 	mutex_init(&pi->lock);
 	init_waitqueue_head(&pi->read_queue);
 
-	ret = kfifo_alloc(&pi->read_fifo, PIBRIDGE_RECV_BUFFER_SIZE,
-			  GFP_KERNEL);
+	ret = kfifo_alloc(&pi->read_fifo, PIBRIDGE_RECV_FIFO_SIZE, GFP_KERNEL);
 	if (ret)
 		return ret;
 

drivers/tty/serdev/pibridge.h

@@ -0,0 +1,24 @@
+#ifndef DRIVERS_PIBRIDGE_H
+#define DRIVERS_PIBRIDGE_H
+
+#include <linux/types.h>
+
+#define PIBRIDGE_RECV_FIFO_SIZE		128
+
+struct pibridge_pkthdr_gate {
+	u8	dst;
+	u8	src;
+	u16	cmd;
+	u16	seq;
+	u8	len;
+} __attribute__((packed));
+
+struct pibridge_pkthdr_io {
+	u8 addr	:6;
+	u8 type	:1;	/* 0 for unicast, 1 for broadcast */
+	u8 rsp	:1;	/* 0 for request, 1 for response */
+	u8 len	:5;
+	u8 cmd	:3;	/* 0 for broadcast*/
+} __attribute__((packed));
+
+#endif /* DRIVERS_PIBRIDGE_H */