drivers/rapidio/rio-access.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * RapidIO configuration space access support
   4  *
   5  * Copyright 2005 MontaVista Software, Inc.
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  */
   8
   9 #include <linux/rio.h>
  10 #include <linux/module.h>
  11
  12 /*
  13  *  Wrappers for all RIO configuration access functions.  They just check
  14  *  alignment and call the low-level functions pointed to by rio_mport->ops.
  15  */
  16
  17 #define RIO_8_BAD 0
  18 #define RIO_16_BAD (offset & 1)
  19 #define RIO_32_BAD (offset & 3)
  20
  21 /**
  22  * RIO_LOP_READ - Generate rio_local_read_config_* functions
  23  * @size: Size of configuration space read (8, 16, 32 bits)
  24  * @type: C type of value argument
  25  * @len: Length of configuration space read (1, 2, 4 bytes)
  26  *
  27  * Generates rio_local_read_config_* functions used to access
  28  * configuration space registers on the local device.
  29  */
  30 #define RIO_LOP_READ(size,type,len) \
  31 int __rio_local_read_config_##size \
  32         (struct rio_mport *mport, u32 offset, type *value)              \
  33 {                                                                       \
  34         int res;                                                        \
  35         u32 data = 0;                                                   \
  36         if (RIO_##size##_BAD) return RIO_BAD_SIZE;                      \
  37         res = mport->ops->lcread(mport, mport->id, offset, len, &data); \
  38         *value = (type)data;                                            \
  39         return res;                                                     \
  40 }
  41
  42 /**
  43  * RIO_LOP_WRITE - Generate rio_local_write_config_* functions
  44  * @size: Size of configuration space write (8, 16, 32 bits)
  45  * @type: C type of value argument
  46  * @len: Length of configuration space write (1, 2, 4 bytes)
  47  *
  48  * Generates rio_local_write_config_* functions used to access
  49  * configuration space registers on the local device.
  50  */
  51 #define RIO_LOP_WRITE(size,type,len) \
  52 int __rio_local_write_config_##size \
  53         (struct rio_mport *mport, u32 offset, type value)               \
  54 {                                                                       \
  55         if (RIO_##size##_BAD) return RIO_BAD_SIZE;                      \
  56         return mport->ops->lcwrite(mport, mport->id, offset, len, value);\
  57 }
  58
  59 RIO_LOP_READ(8, u8, 1)
  60 RIO_LOP_READ(16, u16, 2)
  61 RIO_LOP_READ(32, u32, 4)
  62 RIO_LOP_WRITE(8, u8, 1)
  63 RIO_LOP_WRITE(16, u16, 2)
  64 RIO_LOP_WRITE(32, u32, 4)
  65
  66 EXPORT_SYMBOL_GPL(__rio_local_read_config_8);
  67 EXPORT_SYMBOL_GPL(__rio_local_read_config_16);
  68 EXPORT_SYMBOL_GPL(__rio_local_read_config_32);
  69 EXPORT_SYMBOL_GPL(__rio_local_write_config_8);
  70 EXPORT_SYMBOL_GPL(__rio_local_write_config_16);
  71 EXPORT_SYMBOL_GPL(__rio_local_write_config_32);
  72
  73 /**
  74  * RIO_OP_READ - Generate rio_mport_read_config_* functions
  75  * @size: Size of configuration space read (8, 16, 32 bits)
  76  * @type: C type of value argument
  77  * @len: Length of configuration space read (1, 2, 4 bytes)
  78  *
  79  * Generates rio_mport_read_config_* functions used to access
  80  * configuration space registers on the local device.
  81  */
  82 #define RIO_OP_READ(size,type,len) \
  83 int rio_mport_read_config_##size \
  84         (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type *value)     \
  85 {                                                                       \
  86         int res;                                                        \
  87         u32 data = 0;                                                   \
  88         if (RIO_##size##_BAD) return RIO_BAD_SIZE;                      \
  89         res = mport->ops->cread(mport, mport->id, destid, hopcount, offset, len, &data); \
  90         *value = (type)data;                                            \
  91         return res;                                                     \
  92 }
  93
  94 /**
  95  * RIO_OP_WRITE - Generate rio_mport_write_config_* functions
  96  * @size: Size of configuration space write (8, 16, 32 bits)
  97  * @type: C type of value argument
  98  * @len: Length of configuration space write (1, 2, 4 bytes)
  99  *
 100  * Generates rio_mport_write_config_* functions used to access
 101  * configuration space registers on the local device.
 102  */
 103 #define RIO_OP_WRITE(size,type,len) \
 104 int rio_mport_write_config_##size \
 105         (struct rio_mport *mport, u16 destid, u8 hopcount, u32 offset, type value)      \
 106 {                                                                       \
 107         if (RIO_##size##_BAD) return RIO_BAD_SIZE;                      \
 108         return mport->ops->cwrite(mport, mport->id, destid, hopcount,   \
 109                         offset, len, value);                            \
 110 }
 111
 112 RIO_OP_READ(8, u8, 1)
 113 RIO_OP_READ(16, u16, 2)
 114 RIO_OP_READ(32, u32, 4)
 115 RIO_OP_WRITE(8, u8, 1)
 116 RIO_OP_WRITE(16, u16, 2)
 117 RIO_OP_WRITE(32, u32, 4)
 118
 119 EXPORT_SYMBOL_GPL(rio_mport_read_config_8);
 120 EXPORT_SYMBOL_GPL(rio_mport_read_config_16);
 121 EXPORT_SYMBOL_GPL(rio_mport_read_config_32);
 122 EXPORT_SYMBOL_GPL(rio_mport_write_config_8);
 123 EXPORT_SYMBOL_GPL(rio_mport_write_config_16);
 124 EXPORT_SYMBOL_GPL(rio_mport_write_config_32);
 125
 126 /**
 127  * rio_mport_send_doorbell - Send a doorbell message
 128  *
 129  * @mport: RIO master port
 130  * @destid: RIO device destination ID
 131  * @data: Doorbell message data
 132  *
 133  * Send a doorbell message to a RIO device. The doorbell message
 134  * has a 16-bit info field provided by the data argument.
 135  */
 136 int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid, u16 data)
 137 {
 138         return mport->ops->dsend(mport, mport->id, destid, data);
 139 }
 140
 141 EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);