Eric Lee / smarc-fsl-linux-kernel

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drivers/rapidio/rio-access.c 4.42 KB
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  // SPDX-License-Identifier: GPL-2.0-or-later
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  /*
   * RapidIO configuration space access support
   *
   * Copyright 2005 MontaVista Software, Inc.
   * Matt Porter <mporter@kernel.crashing.org>
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   */
  
  #include <linux/rio.h>
  #include <linux/module.h>
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  #include <linux/rio_drv.h>
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  /*
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   *  Wrappers for all RIO configuration access functions.  They just check
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   *  alignment and call the low-level functions pointed to by rio_mport->ops.
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   */
  
  #define RIO_8_BAD 0
  #define RIO_16_BAD (offset & 1)
  #define RIO_32_BAD (offset & 3)
  
  /**
   * RIO_LOP_READ - Generate rio_local_read_config_* functions
   * @size: Size of configuration space read (8, 16, 32 bits)
   * @type: C type of value argument
   * @len: Length of configuration space read (1, 2, 4 bytes)
   *
   * Generates rio_local_read_config_* functions used to access
   * configuration space registers on the local device.
   */
  #define RIO_LOP_READ(size,type,len) \
  int __rio_local_read_config_##size \
  	(struct rio_mport *mport, u32 offset, type *value)		\
  {									\
  	int res;							\
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  	u32 data = 0;							\
  	if (RIO_##size##_BAD) return RIO_BAD_SIZE;			\
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  	res = mport->ops->lcread(mport, mport->id, offset, len, &data);	\
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  	*value = (type)data;						\
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  	return res;							\
  }
  
  /**
   * RIO_LOP_WRITE - Generate rio_local_write_config_* functions
   * @size: Size of configuration space write (8, 16, 32 bits)
   * @type: C type of value argument
   * @len: Length of configuration space write (1, 2, 4 bytes)
   *
   * Generates rio_local_write_config_* functions used to access
   * configuration space registers on the local device.
   */
  #define RIO_LOP_WRITE(size,type,len) \
  int __rio_local_write_config_##size \
  	(struct rio_mport *mport, u32 offset, type value)		\
  {									\
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  	if (RIO_##size##_BAD) return RIO_BAD_SIZE;			\
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  	return mport->ops->lcwrite(mport, mport->id, offset, len, value);\
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  }
  
  RIO_LOP_READ(8, u8, 1)
  RIO_LOP_READ(16, u16, 2)
  RIO_LOP_READ(32, u32, 4)
  RIO_LOP_WRITE(8, u8, 1)
  RIO_LOP_WRITE(16, u16, 2)
  RIO_LOP_WRITE(32, u32, 4)
  
  EXPORT_SYMBOL_GPL(__rio_local_read_config_8);
  EXPORT_SYMBOL_GPL(__rio_local_read_config_16);
  EXPORT_SYMBOL_GPL(__rio_local_read_config_32);
  EXPORT_SYMBOL_GPL(__rio_local_write_config_8);
  EXPORT_SYMBOL_GPL(__rio_local_write_config_16);
  EXPORT_SYMBOL_GPL(__rio_local_write_config_32);
  
  /**
   * RIO_OP_READ - Generate rio_mport_read_config_* functions
   * @size: Size of configuration space read (8, 16, 32 bits)
   * @type: C type of value argument
   * @len: Length of configuration space read (1, 2, 4 bytes)
   *
   * Generates rio_mport_read_config_* functions used to access
   * configuration space registers on the local device.
   */
  #define RIO_OP_READ(size,type,len) \
  int rio_mport_read_config_##size \
  	(struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type *value)	\
  {									\
  	int res;							\
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  	u32 data = 0;							\
  	if (RIO_##size##_BAD) return RIO_BAD_SIZE;			\
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  	res = mport->ops->cread(mport, mport->id, destid, hopcount, offset, len, &data); \
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  	*value = (type)data;						\
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  	return res;							\
  }
  
  /**
   * RIO_OP_WRITE - Generate rio_mport_write_config_* functions
   * @size: Size of configuration space write (8, 16, 32 bits)
   * @type: C type of value argument
   * @len: Length of configuration space write (1, 2, 4 bytes)
   *
   * Generates rio_mport_write_config_* functions used to access
   * configuration space registers on the local device.
   */
  #define RIO_OP_WRITE(size,type,len) \
  int rio_mport_write_config_##size \
  	(struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type value)	\
  {									\
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  	if (RIO_##size##_BAD) return RIO_BAD_SIZE;			\
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  	return mport->ops->cwrite(mport, mport->id, destid, hopcount,	\
  			offset, len, value);				\
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  }
  
  RIO_OP_READ(8, u8, 1)
  RIO_OP_READ(16, u16, 2)
  RIO_OP_READ(32, u32, 4)
  RIO_OP_WRITE(8, u8, 1)
  RIO_OP_WRITE(16, u16, 2)
  RIO_OP_WRITE(32, u32, 4)
  
  EXPORT_SYMBOL_GPL(rio_mport_read_config_8);
  EXPORT_SYMBOL_GPL(rio_mport_read_config_16);
  EXPORT_SYMBOL_GPL(rio_mport_read_config_32);
  EXPORT_SYMBOL_GPL(rio_mport_write_config_8);
  EXPORT_SYMBOL_GPL(rio_mport_write_config_16);
  EXPORT_SYMBOL_GPL(rio_mport_write_config_32);
  
  /**
   * rio_mport_send_doorbell - Send a doorbell message
   *
   * @mport: RIO master port
   * @destid: RIO device destination ID
   * @data: Doorbell message data
   *
   * Send a doorbell message to a RIO device. The doorbell message
   * has a 16-bit info field provided by the data argument.
   */
  int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid, u16 data)
  {
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  	return mport->ops->dsend(mport, mport->id, destid, data);
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  }
  
  EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);