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linux-next/include/linux/rio_drv.h
Alexandre Bounine a11650e110 rapidio: make enumeration/discovery configurable 
Systems that use RapidIO fabric may need to implement their own
enumeration and discovery methods which are better suitable for needs of
a target application.

The following set of patches is intended to simplify process of
introduction of new RapidIO fabric enumeration/discovery methods.

The first patch offers ability to add new RapidIO enumeration/discovery
methods using kernel configuration options.  This new configuration
option mechanism allows to select statically linked or modular
enumeration/discovery method(s) from the list of existing methods or use
external module(s).

This patch also updates the currently existing enumeration/discovery
code to be used as a statically linked or modular method.

The corresponding configuration option is named "Basic
enumeration/discovery" method.  This is the only one configuration
option available today but new methods are expected to be introduced
after adoption of provided patches.

The second patch address a long time complaint of RapidIO subsystem
users regarding fabric enumeration/discovery start sequence.  Existing
implementation offers only a boot-time enumeration/discovery start which
requires synchronized boot of all endpoints in RapidIO network.  While
it works for small closed configurations with limited number of
endpoints, using this approach in systems with large number of endpoints
is quite challenging.

To eliminate requirement for synchronized start the second patch
introduces RapidIO enumeration/discovery start from user space.

For compatibility with the existing RapidIO subsystem implementation,
automatic boot time enumeration/discovery start can be configured in by
specifying "rio-scan.scan=1" command line parameter if statically linked
basic enumeration method is selected.

This patch:

Rework to implement RapidIO enumeration/discovery method selection
combined with ability to use enumeration/discovery as a kernel module.

This patch adds ability to introduce new RapidIO enumeration/discovery
methods using kernel configuration options.  Configuration option
mechanism allows to select statically linked or modular
enumeration/discovery method from the list of existing methods or use
external modules.  If a modular enumeration/discovery is selected each
RapidIO mport device can have its own method attached to it.

The existing enumeration/discovery code was updated to be used as
statically linked or modular method.  This configuration option is named
"Basic enumeration/discovery" method.

Several common routines have been moved from rio-scan.c to make them
available to other enumeration methods and reduce number of exported
symbols.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-24 16:22:50 -07:00

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/*
* RapidIO driver services
*
* 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.
*/
#ifndef LINUX_RIO_DRV_H
#define LINUX_RIO_DRV_H
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/rio.h>
extern int __rio_local_read_config_32(struct rio_mport *port, u32 offset,
u32 * data);
extern int __rio_local_write_config_32(struct rio_mport *port, u32 offset,
u32 data);
extern int __rio_local_read_config_16(struct rio_mport *port, u32 offset,
u16 * data);
extern int __rio_local_write_config_16(struct rio_mport *port, u32 offset,
u16 data);
extern int __rio_local_read_config_8(struct rio_mport *port, u32 offset,
u8 * data);
extern int __rio_local_write_config_8(struct rio_mport *port, u32 offset,
u8 data);
extern int rio_mport_read_config_32(struct rio_mport *port, u16 destid,
u8 hopcount, u32 offset, u32 * data);
extern int rio_mport_write_config_32(struct rio_mport *port, u16 destid,
u8 hopcount, u32 offset, u32 data);
extern int rio_mport_read_config_16(struct rio_mport *port, u16 destid,
u8 hopcount, u32 offset, u16 * data);
extern int rio_mport_write_config_16(struct rio_mport *port, u16 destid,
u8 hopcount, u32 offset, u16 data);
extern int rio_mport_read_config_8(struct rio_mport *port, u16 destid,
u8 hopcount, u32 offset, u8 * data);
extern int rio_mport_write_config_8(struct rio_mport *port, u16 destid,
u8 hopcount, u32 offset, u8 data);
/**
* rio_local_read_config_32 - Read 32 bits from local configuration space
* @port: Master port
* @offset: Offset into local configuration space
* @data: Pointer to read data into
*
* Reads 32 bits of data from the specified offset within the local
* device's configuration space.
*/
static inline int rio_local_read_config_32(struct rio_mport *port, u32 offset,
u32 * data)
{
return __rio_local_read_config_32(port, offset, data);
}
/**
* rio_local_write_config_32 - Write 32 bits to local configuration space
* @port: Master port
* @offset: Offset into local configuration space
* @data: Data to be written
*
* Writes 32 bits of data to the specified offset within the local
* device's configuration space.
*/
static inline int rio_local_write_config_32(struct rio_mport *port, u32 offset,
u32 data)
{
return __rio_local_write_config_32(port, offset, data);
}
/**
* rio_local_read_config_16 - Read 16 bits from local configuration space
* @port: Master port
* @offset: Offset into local configuration space
* @data: Pointer to read data into
*
* Reads 16 bits of data from the specified offset within the local
* device's configuration space.
*/
static inline int rio_local_read_config_16(struct rio_mport *port, u32 offset,
u16 * data)
{
return __rio_local_read_config_16(port, offset, data);
}
/**
* rio_local_write_config_16 - Write 16 bits to local configuration space
* @port: Master port
* @offset: Offset into local configuration space
* @data: Data to be written
*
* Writes 16 bits of data to the specified offset within the local
* device's configuration space.
*/
static inline int rio_local_write_config_16(struct rio_mport *port, u32 offset,
u16 data)
{
return __rio_local_write_config_16(port, offset, data);
}
/**
* rio_local_read_config_8 - Read 8 bits from local configuration space
* @port: Master port
* @offset: Offset into local configuration space
* @data: Pointer to read data into
*
* Reads 8 bits of data from the specified offset within the local
* device's configuration space.
*/
static inline int rio_local_read_config_8(struct rio_mport *port, u32 offset,
u8 * data)
{
return __rio_local_read_config_8(port, offset, data);
}
/**
* rio_local_write_config_8 - Write 8 bits to local configuration space
* @port: Master port
* @offset: Offset into local configuration space
* @data: Data to be written
*
* Writes 8 bits of data to the specified offset within the local
* device's configuration space.
*/
static inline int rio_local_write_config_8(struct rio_mport *port, u32 offset,
u8 data)
{
return __rio_local_write_config_8(port, offset, data);
}
/**
* rio_read_config_32 - Read 32 bits from configuration space
* @rdev: RIO device
* @offset: Offset into device configuration space
* @data: Pointer to read data into
*
* Reads 32 bits of data from the specified offset within the
* RIO device's configuration space.
*/
static inline int rio_read_config_32(struct rio_dev *rdev, u32 offset,
u32 * data)
{
return rio_mport_read_config_32(rdev->net->hport, rdev->destid,
rdev->hopcount, offset, data);
};
/**
* rio_write_config_32 - Write 32 bits to configuration space
* @rdev: RIO device
* @offset: Offset into device configuration space
* @data: Data to be written
*
* Writes 32 bits of data to the specified offset within the
* RIO device's configuration space.
*/
static inline int rio_write_config_32(struct rio_dev *rdev, u32 offset,
u32 data)
{
return rio_mport_write_config_32(rdev->net->hport, rdev->destid,
rdev->hopcount, offset, data);
};
/**
* rio_read_config_16 - Read 16 bits from configuration space
* @rdev: RIO device
* @offset: Offset into device configuration space
* @data: Pointer to read data into
*
* Reads 16 bits of data from the specified offset within the
* RIO device's configuration space.
*/
static inline int rio_read_config_16(struct rio_dev *rdev, u32 offset,
u16 * data)
{
return rio_mport_read_config_16(rdev->net->hport, rdev->destid,
rdev->hopcount, offset, data);
};
/**
* rio_write_config_16 - Write 16 bits to configuration space
* @rdev: RIO device
* @offset: Offset into device configuration space
* @data: Data to be written
*
* Writes 16 bits of data to the specified offset within the
* RIO device's configuration space.
*/
static inline int rio_write_config_16(struct rio_dev *rdev, u32 offset,
u16 data)
{
return rio_mport_write_config_16(rdev->net->hport, rdev->destid,
rdev->hopcount, offset, data);
};
/**
* rio_read_config_8 - Read 8 bits from configuration space
* @rdev: RIO device
* @offset: Offset into device configuration space
* @data: Pointer to read data into
*
* Reads 8 bits of data from the specified offset within the
* RIO device's configuration space.
*/
static inline int rio_read_config_8(struct rio_dev *rdev, u32 offset, u8 * data)
{
return rio_mport_read_config_8(rdev->net->hport, rdev->destid,
rdev->hopcount, offset, data);
};
/**
* rio_write_config_8 - Write 8 bits to configuration space
* @rdev: RIO device
* @offset: Offset into device configuration space
* @data: Data to be written
*
* Writes 8 bits of data to the specified offset within the
* RIO device's configuration space.
*/
static inline int rio_write_config_8(struct rio_dev *rdev, u32 offset, u8 data)
{
return rio_mport_write_config_8(rdev->net->hport, rdev->destid,
rdev->hopcount, offset, data);
};
extern int rio_mport_send_doorbell(struct rio_mport *mport, u16 destid,
u16 data);
/**
* rio_send_doorbell - Send a doorbell message to a device
* @rdev: RIO device
* @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.
*/
static inline int rio_send_doorbell(struct rio_dev *rdev, u16 data)
{
return rio_mport_send_doorbell(rdev->net->hport, rdev->destid, data);
};
/**
* rio_init_mbox_res - Initialize a RIO mailbox resource
* @res: resource struct
* @start: start of mailbox range
* @end: end of mailbox range
*
* This function is used to initialize the fields of a resource
* for use as a mailbox resource. It initializes a range of
* mailboxes using the start and end arguments.
*/
static inline void rio_init_mbox_res(struct resource *res, int start, int end)
{
memset(res, 0, sizeof(struct resource));
res->start = start;
res->end = end;
res->flags = RIO_RESOURCE_MAILBOX;
}
/**
* rio_init_dbell_res - Initialize a RIO doorbell resource
* @res: resource struct
* @start: start of doorbell range
* @end: end of doorbell range
*
* This function is used to initialize the fields of a resource
* for use as a doorbell resource. It initializes a range of
* doorbell messages using the start and end arguments.
*/
static inline void rio_init_dbell_res(struct resource *res, u16 start, u16 end)
{
memset(res, 0, sizeof(struct resource));
res->start = start;
res->end = end;
res->flags = RIO_RESOURCE_DOORBELL;
}
/**
* RIO_DEVICE - macro used to describe a specific RIO device
* @dev: the 16 bit RIO device ID
* @ven: the 16 bit RIO vendor ID
*
* This macro is used to create a struct rio_device_id that matches a
* specific device. The assembly vendor and assembly device fields
* will be set to %RIO_ANY_ID.
*/
#define RIO_DEVICE(dev,ven) \
.did = (dev), .vid = (ven), \
.asm_did = RIO_ANY_ID, .asm_vid = RIO_ANY_ID
/* Mailbox management */
extern int rio_request_outb_mbox(struct rio_mport *, void *, int, int,
void (*)(struct rio_mport *, void *,int, int));
extern int rio_release_outb_mbox(struct rio_mport *, int);
/**
* rio_add_outb_message - Add RIO message to an outbound mailbox queue
* @mport: RIO master port containing the outbound queue
* @rdev: RIO device the message is be sent to
* @mbox: The outbound mailbox queue
* @buffer: Pointer to the message buffer
* @len: Length of the message buffer
*
* Adds a RIO message buffer to an outbound mailbox queue for
* transmission. Returns 0 on success.
*/
static inline int rio_add_outb_message(struct rio_mport *mport,
struct rio_dev *rdev, int mbox,
void *buffer, size_t len)
{
return mport->ops->add_outb_message(mport, rdev, mbox,
buffer, len);
}
extern int rio_request_inb_mbox(struct rio_mport *, void *, int, int,
void (*)(struct rio_mport *, void *, int, int));
extern int rio_release_inb_mbox(struct rio_mport *, int);
/**
* rio_add_inb_buffer - Add buffer to an inbound mailbox queue
* @mport: Master port containing the inbound mailbox
* @mbox: The inbound mailbox number
* @buffer: Pointer to the message buffer
*
* Adds a buffer to an inbound mailbox queue for reception. Returns
* 0 on success.
*/
static inline int rio_add_inb_buffer(struct rio_mport *mport, int mbox,
void *buffer)
{
return mport->ops->add_inb_buffer(mport, mbox, buffer);
}
/**
* rio_get_inb_message - Get A RIO message from an inbound mailbox queue
* @mport: Master port containing the inbound mailbox
* @mbox: The inbound mailbox number
*
* Get a RIO message from an inbound mailbox queue. Returns 0 on success.
*/
static inline void *rio_get_inb_message(struct rio_mport *mport, int mbox)
{
return mport->ops->get_inb_message(mport, mbox);
}
/* Doorbell management */
extern int rio_request_inb_dbell(struct rio_mport *, void *, u16, u16,
void (*)(struct rio_mport *, void *, u16, u16, u16));
extern int rio_release_inb_dbell(struct rio_mport *, u16, u16);
extern struct resource *rio_request_outb_dbell(struct rio_dev *, u16, u16);
extern int rio_release_outb_dbell(struct rio_dev *, struct resource *);
/* Memory region management */
int rio_claim_resource(struct rio_dev *, int);
int rio_request_regions(struct rio_dev *, char *);
void rio_release_regions(struct rio_dev *);
int rio_request_region(struct rio_dev *, int, char *);
void rio_release_region(struct rio_dev *, int);
/* Memory mapping functions */
extern int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
u64 rbase, u32 size, u32 rflags);
extern void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart);
/* Port-Write management */
extern int rio_request_inb_pwrite(struct rio_dev *,
int (*)(struct rio_dev *, union rio_pw_msg*, int));
extern int rio_release_inb_pwrite(struct rio_dev *);
extern int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg);
/* LDM support */
int rio_register_driver(struct rio_driver *);
void rio_unregister_driver(struct rio_driver *);
struct rio_dev *rio_dev_get(struct rio_dev *);
void rio_dev_put(struct rio_dev *);
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
extern struct dma_chan *rio_request_dma(struct rio_dev *rdev);
extern void rio_release_dma(struct dma_chan *dchan);
extern struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(
struct rio_dev *rdev, struct dma_chan *dchan,
struct rio_dma_data *data,
enum dma_transfer_direction direction, unsigned long flags);
#endif
/**
* rio_name - Get the unique RIO device identifier
* @rdev: RIO device
*
* Get the unique RIO device identifier. Returns the device
* identifier string.
*/
static inline const char *rio_name(struct rio_dev *rdev)
{
return dev_name(&rdev->dev);
}
/**
* rio_get_drvdata - Get RIO driver specific data
* @rdev: RIO device
*
* Get RIO driver specific data. Returns a pointer to the
* driver specific data.
*/
static inline void *rio_get_drvdata(struct rio_dev *rdev)
{
return dev_get_drvdata(&rdev->dev);
}
/**
* rio_set_drvdata - Set RIO driver specific data
* @rdev: RIO device
* @data: Pointer to driver specific data
*
* Set RIO driver specific data. device struct driver data pointer
* is set to the @data argument.
*/
static inline void rio_set_drvdata(struct rio_dev *rdev, void *data)
{
dev_set_drvdata(&rdev->dev, data);
}
/* Misc driver helpers */
extern u16 rio_local_get_device_id(struct rio_mport *port);
extern struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from);
extern struct rio_dev *rio_get_asm(u16 vid, u16 did, u16 asm_vid, u16 asm_did,
struct rio_dev *from);
extern int rio_init_mports(void);
#endif /* LINUX_RIO_DRV_H */
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