drivers/media/pci/ddbridge/ddbridge-io.h

   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__ */