You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
175 lines
5.5 KiB
175 lines
5.5 KiB
/* |
|
* RapidIO configuration space access support |
|
* |
|
* Copyright 2005 MontaVista Software, Inc. |
|
* Matt Porter <mporter@kernel.crashing.org> |
|
* |
|
* This program is free software; you can redistribute it and/or modify it |
|
* under the terms of the GNU General Public License as published by the |
|
* Free Software Foundation; either version 2 of the License, or (at your |
|
* option) any later version. |
|
*/ |
|
|
|
#include <linux/rio.h> |
|
#include <linux/module.h> |
|
|
|
/* |
|
* These interrupt-safe spinlocks protect all accesses to RIO |
|
* configuration space and doorbell access. |
|
*/ |
|
static DEFINE_SPINLOCK(rio_config_lock); |
|
static DEFINE_SPINLOCK(rio_doorbell_lock); |
|
|
|
/* |
|
* Wrappers for all RIO configuration access functions. They just check |
|
* alignment, do locking and call the low-level functions pointed to |
|
* by rio_mport->ops. |
|
*/ |
|
|
|
#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; \ |
|
unsigned long flags; \ |
|
u32 data = 0; \ |
|
if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ |
|
spin_lock_irqsave(&rio_config_lock, flags); \ |
|
res = mport->ops->lcread(mport, mport->id, offset, len, &data); \ |
|
*value = (type)data; \ |
|
spin_unlock_irqrestore(&rio_config_lock, flags); \ |
|
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) \ |
|
{ \ |
|
int res; \ |
|
unsigned long flags; \ |
|
if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ |
|
spin_lock_irqsave(&rio_config_lock, flags); \ |
|
res = mport->ops->lcwrite(mport, mport->id, offset, len, value);\ |
|
spin_unlock_irqrestore(&rio_config_lock, flags); \ |
|
return res; \ |
|
} |
|
|
|
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; \ |
|
unsigned long flags; \ |
|
u32 data = 0; \ |
|
if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ |
|
spin_lock_irqsave(&rio_config_lock, flags); \ |
|
res = mport->ops->cread(mport, mport->id, destid, hopcount, offset, len, &data); \ |
|
*value = (type)data; \ |
|
spin_unlock_irqrestore(&rio_config_lock, flags); \ |
|
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) \ |
|
{ \ |
|
int res; \ |
|
unsigned long flags; \ |
|
if (RIO_##size##_BAD) return RIO_BAD_SIZE; \ |
|
spin_lock_irqsave(&rio_config_lock, flags); \ |
|
res = mport->ops->cwrite(mport, mport->id, destid, hopcount, offset, len, value); \ |
|
spin_unlock_irqrestore(&rio_config_lock, flags); \ |
|
return res; \ |
|
} |
|
|
|
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) |
|
{ |
|
int res; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&rio_doorbell_lock, flags); |
|
res = mport->ops->dsend(mport, mport->id, destid, data); |
|
spin_unlock_irqrestore(&rio_doorbell_lock, flags); |
|
|
|
return res; |
|
} |
|
|
|
EXPORT_SYMBOL_GPL(rio_mport_send_doorbell);
|
|
|