1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * ddbridge-io.h: Digital Devices bridge I/O inline functions
4  *
5  * Copyright (C) 2010-2017 Digital Devices GmbH
6  *                         Ralph Metzler <rjkm@metzlerbros.de>
7  *                         Marcus Metzler <mocm@metzlerbros.de>
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License
11  * version 2 only, as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  */
18 
19 #ifndef __DDBRIDGE_IO_H__
20 #define __DDBRIDGE_IO_H__
21 
22 #include <linux/io.h>
23 
24 #include "ddbridge.h"
25 
26 /******************************************************************************/
27 
28 static inline u32 ddblreadl(struct ddb_link *link, u32 adr)
29 {
30 	return readl(link->dev->regs + adr);
31 }
32 
33 static inline void ddblwritel(struct ddb_link *link, u32 val, u32 adr)
34 {
35 	writel(val, link->dev->regs + adr);
36 }
37 
38 static inline u32 ddbreadl(struct ddb *dev, u32 adr)
39 {
40 	return readl(dev->regs + adr);
41 }
42 
43 static inline void ddbwritel(struct ddb *dev, u32 val, u32 adr)
44 {
45 	writel(val, dev->regs + adr);
46 }
47 
48 static inline void ddbcpyto(struct ddb *dev, u32 adr, void *src, long count)
49 {
50 	memcpy_toio(dev->regs + adr, src, count);
51 }
52 
53 static inline void ddbcpyfrom(struct ddb *dev, void *dst, u32 adr, long count)
54 {
55 	memcpy_fromio(dst, dev->regs + adr, count);
56 }
57 
58 static inline u32 safe_ddbreadl(struct ddb *dev, u32 adr)
59 {
60 	u32 val = ddbreadl(dev, adr);
61 
62 	/* (ddb)readl returns (uint)-1 (all bits set) on failure, catch that */
63 	if (val == ~0) {
64 		dev_err(&dev->pdev->dev, "ddbreadl failure, adr=%08x\n", adr);
65 		return 0;
66 	}
67 
68 	return val;
69 }
70 
71 #endif /* __DDBRIDGE_IO_H__ */
72