[linux.git] / drivers / rapidio / rio.c

/*
 * RapidIO interconnect services
 * (RapidIO Interconnect Specification, http://www.rapidio.org)
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <[email protected]>
 *
 * 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/config.h>
#include <linux/types.h>
#include <linux/kernel.h>

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/rio_ids.h>
#include <linux/rio_regs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/slab.h>

#include "rio.h"

static LIST_HEAD(rio_mports);

/**
 * rio_local_get_device_id - Get the base/extended device id for a port
 * @port: RIO master port from which to get the deviceid
 *
 * Reads the base/extended device id from the local device
 * implementing the master port. Returns the 8/16-bit device
 * id.
 */
u16 rio_local_get_device_id(struct rio_mport *port)
{
	u32 result;

	rio_local_read_config_32(port, RIO_DID_CSR, &result);

	return (RIO_GET_DID(result));
}

/**
 * rio_request_inb_mbox - request inbound mailbox service
 * @mport: RIO master port from which to allocate the mailbox resource
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox number to claim
 * @entries: Number of entries in inbound mailbox queue
 * @minb: Callback to execute when inbound message is received
 *
 * Requests ownership of an inbound mailbox resource and binds
 * a callback function to the resource. Returns %0 on success.
 */
int rio_request_inb_mbox(struct rio_mport *mport,
			 void *dev_id,
			 int mbox,
			 int entries,
			 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
				       int slot))
{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_mbox_res(res, mbox, mbox);

		/* Make sure this mailbox isn't in use */
		if ((rc =
		     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
				      res)) < 0) {
			kfree(res);
			goto out;
		}

		mport->inb_msg[mbox].res = res;

		/* Hook the inbound message callback */
		mport->inb_msg[mbox].mcback = minb;

		rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
	} else
		rc = -ENOMEM;

      out:
	return rc;
}

/**
 * rio_release_inb_mbox - release inbound mailbox message service
 * @mport: RIO master port from which to release the mailbox resource
 * @mbox: Mailbox number to release
 *
 * Releases ownership of an inbound mailbox resource. Returns 0
 * if the request has been satisfied.
 */
int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
{
	rio_close_inb_mbox(mport, mbox);

	/* Release the mailbox resource */
	return release_resource(mport->inb_msg[mbox].res);
}

/**
 * rio_request_outb_mbox - request outbound mailbox service
 * @mport: RIO master port from which to allocate the mailbox resource
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox number to claim
 * @entries: Number of entries in outbound mailbox queue
 * @moutb: Callback to execute when outbound message is sent
 *
 * Requests ownership of an outbound mailbox resource and binds
 * a callback function to the resource. Returns 0 on success.
 */
int rio_request_outb_mbox(struct rio_mport *mport,
			  void *dev_id,
			  int mbox,
			  int entries,
			  void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_mbox_res(res, mbox, mbox);

		/* Make sure this outbound mailbox isn't in use */
		if ((rc =
		     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
				      res)) < 0) {
			kfree(res);
			goto out;
		}

		mport->outb_msg[mbox].res = res;

		/* Hook the inbound message callback */
		mport->outb_msg[mbox].mcback = moutb;

		rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
	} else
		rc = -ENOMEM;

      out:
	return rc;
}

/**
 * rio_release_outb_mbox - release outbound mailbox message service
 * @mport: RIO master port from which to release the mailbox resource
 * @mbox: Mailbox number to release
 *
 * Releases ownership of an inbound mailbox resource. Returns 0
 * if the request has been satisfied.
 */
int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
{
	rio_close_outb_mbox(mport, mbox);

	/* Release the mailbox resource */
	return release_resource(mport->outb_msg[mbox].res);
}

/**
 * rio_setup_inb_dbell - bind inbound doorbell callback
 * @mport: RIO master port to bind the doorbell callback
 * @dev_id: Device specific pointer to pass on event
 * @res: Doorbell message resource
 * @dinb: Callback to execute when doorbell is received
 *
 * Adds a doorbell resource/callback pair into a port's
 * doorbell event list. Returns 0 if the request has been
 * satisfied.
 */
static int
rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
		    void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
				  u16 info))
{
	int rc = 0;
	struct rio_dbell *dbell;

	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
		rc = -ENOMEM;
		goto out;
	}

	dbell->res = res;
	dbell->dinb = dinb;
	dbell->dev_id = dev_id;

	list_add_tail(&dbell->node, &mport->dbells);

      out:
	return rc;
}

/**
 * rio_request_inb_dbell - request inbound doorbell message service
 * @mport: RIO master port from which to allocate the doorbell resource
 * @dev_id: Device specific pointer to pass on event
 * @start: Doorbell info range start
 * @end: Doorbell info range end
 * @dinb: Callback to execute when doorbell is received
 *
 * Requests ownership of an inbound doorbell resource and binds
 * a callback function to the resource. Returns 0 if the request
 * has been satisfied.
 */
int rio_request_inb_dbell(struct rio_mport *mport,
			  void *dev_id,
			  u16 start,
			  u16 end,
			  void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
					u16 dst, u16 info))
{
	int rc = 0;

	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_dbell_res(res, start, end);

		/* Make sure these doorbells aren't in use */
		if ((rc =
		     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
				      res)) < 0) {
			kfree(res);
			goto out;
		}

		/* Hook the doorbell callback */
		rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
	} else
		rc = -ENOMEM;

      out:
	return rc;
}

/**
 * rio_release_inb_dbell - release inbound doorbell message service
 * @mport: RIO master port from which to release the doorbell resource
 * @start: Doorbell info range start
 * @end: Doorbell info range end
 *
 * Releases ownership of an inbound doorbell resource and removes
 * callback from the doorbell event list. Returns 0 if the request
 * has been satisfied.
 */
int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
{
	int rc = 0, found = 0;
	struct rio_dbell *dbell;

	list_for_each_entry(dbell, &mport->dbells, node) {
		if ((dbell->res->start == start) && (dbell->res->end == end)) {
			found = 1;
			break;
		}
	}

	/* If we can't find an exact match, fail */
	if (!found) {
		rc = -EINVAL;
		goto out;
	}

	/* Delete from list */
	list_del(&dbell->node);

	/* Release the doorbell resource */
	rc = release_resource(dbell->res);

	/* Free the doorbell event */
	kfree(dbell);

      out:
	return rc;
}

/**
 * rio_request_outb_dbell - request outbound doorbell message range
 * @rdev: RIO device from which to allocate the doorbell resource
 * @start: Doorbell message range start
 * @end: Doorbell message range end
 *
 * Requests ownership of a doorbell message range. Returns a resource
 * if the request has been satisfied or %NULL on failure.
 */
struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
					u16 end)
{
	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);

	if (res) {
		rio_init_dbell_res(res, start, end);

		/* Make sure these doorbells aren't in use */
		if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
		    < 0) {
			kfree(res);
			res = NULL;
		}
	}

	return res;
}

/**
 * rio_release_outb_dbell - release outbound doorbell message range
 * @rdev: RIO device from which to release the doorbell resource
 * @res: Doorbell resource to be freed
 *
 * Releases ownership of a doorbell message range. Returns 0 if the
 * request has been satisfied.
 */
int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
{
	int rc = release_resource(res);

	kfree(res);

	return rc;
}

/**
 * rio_mport_get_feature - query for devices' extended features
 * @port: Master port to issue transaction
 * @local: Indicate a local master port or remote device access
 * @destid: Destination ID of the device
 * @hopcount: Number of switch hops to the device
 * @ftr: Extended feature code
 *
 * Tell if a device supports a given RapidIO capability.
 * Returns the offset of the requested extended feature
 * block within the device's RIO configuration space or
 * 0 in case the device does not support it.  Possible
 * values for @ftr:
 *
 * %RIO_EFB_PAR_EP_ID		LP/LVDS EP Devices
 *
 * %RIO_EFB_PAR_EP_REC_ID	LP/LVDS EP Recovery Devices
 *
 * %RIO_EFB_PAR_EP_FREE_ID	LP/LVDS EP Free Devices
 *
 * %RIO_EFB_SER_EP_ID		LP/Serial EP Devices
 *
 * %RIO_EFB_SER_EP_REC_ID	LP/Serial EP Recovery Devices
 *
 * %RIO_EFB_SER_EP_FREE_ID	LP/Serial EP Free Devices
 */
u32
rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
		      u8 hopcount, int ftr)
{
	u32 asm_info, ext_ftr_ptr, ftr_header;

	if (local)
		rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
	else
		rio_mport_read_config_32(port, destid, hopcount,
					 RIO_ASM_INFO_CAR, &asm_info);

	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;

	while (ext_ftr_ptr) {
		if (local)
			rio_local_read_config_32(port, ext_ftr_ptr,
						 &ftr_header);
		else
			rio_mport_read_config_32(port, destid, hopcount,
						 ext_ftr_ptr, &ftr_header);
		if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
			return ext_ftr_ptr;
		if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
			break;
	}

	return 0;
}

/**
 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 * @did: RIO did to match or %RIO_ANY_ID to match all dids
 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
 * @from: Previous RIO device found in search, or %NULL for new search
 *
 * Iterates through the list of known RIO devices. If a RIO device is
 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
 * count to the device is incrememted and a pointer to its device
 * structure is returned. Otherwise, %NULL is returned. A new search
 * is initiated by passing %NULL to the @from argument. Otherwise, if
 * @from is not %NULL, searches continue from next device on the global
 * list. The reference count for @from is always decremented if it is
 * not %NULL.
 */
struct rio_dev *rio_get_asm(u16 vid, u16 did,
			    u16 asm_vid, u16 asm_did, struct rio_dev *from)
{
	struct list_head *n;
	struct rio_dev *rdev;

	WARN_ON(in_interrupt());
	spin_lock(&rio_global_list_lock);
	n = from ? from->global_list.next : rio_devices.next;

	while (n && (n != &rio_devices)) {
		rdev = rio_dev_g(n);
		if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
		    (did == RIO_ANY_ID || rdev->did == did) &&
		    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
		    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
			goto exit;
		n = n->next;
	}
	rdev = NULL;
      exit:
	rio_dev_put(from);
	rdev = rio_dev_get(rdev);
	spin_unlock(&rio_global_list_lock);
	return rdev;
}

/**
 * rio_get_device - Begin or continue searching for a RIO device by vid/did
 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 * @did: RIO did to match or %RIO_ANY_ID to match all dids
 * @from: Previous RIO device found in search, or %NULL for new search
 *
 * Iterates through the list of known RIO devices. If a RIO device is
 * found with a matching @vid and @did, the reference count to the
 * device is incrememted and a pointer to its device structure is returned.
 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
 * to the @from argument. Otherwise, if @from is not %NULL, searches
 * continue from next device on the global list. The reference count for
 * @from is always decremented if it is not %NULL.
 */
struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
{
	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
}

static void rio_fixup_device(struct rio_dev *dev)
{
}

static int __devinit rio_init(void)
{
	struct rio_dev *dev = NULL;

	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
		rio_fixup_device(dev);
	}
	return 0;
}

device_initcall(rio_init);

int rio_init_mports(void)
{
	int rc = 0;
	struct rio_mport *port;

	list_for_each_entry(port, &rio_mports, node) {
		if (!request_mem_region(port->iores.start,
					port->iores.end - port->iores.start,
					port->name)) {
			printk(KERN_ERR
			       "RIO: Error requesting master port region %8.8lx-%8.8lx\n",
			       port->iores.start, port->iores.end - 1);
			rc = -ENOMEM;
			goto out;
		}

		if (port->host_deviceid >= 0)
			rio_enum_mport(port);
		else
			rio_disc_mport(port);
	}

      out:
	return rc;
}

void rio_register_mport(struct rio_mport *port)
{
	list_add_tail(&port->node, &rio_mports);
}

EXPORT_SYMBOL_GPL(rio_local_get_device_id);
EXPORT_SYMBOL_GPL(rio_get_device);
EXPORT_SYMBOL_GPL(rio_get_asm);
EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
Commit	Line	Data
394b701c MP	1	/*
	2	* RapidIO interconnect services
	3	* (RapidIO Interconnect Specification, http://www.rapidio.org)
	4	*
	5	* Copyright 2005 MontaVista Software, Inc.
	6	* Matt Porter <[email protected]>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/config.h>
	15	#include <linux/types.h>
	16	#include <linux/kernel.h>
	17
	18	#include <linux/delay.h>
	19	#include <linux/init.h>
	20	#include <linux/rio.h>
	21	#include <linux/rio_drv.h>
	22	#include <linux/rio_ids.h>
	23	#include <linux/rio_regs.h>
	24	#include <linux/module.h>
	25	#include <linux/spinlock.h>
de25968c	26	#include <linux/slab.h>
394b701c MP	27
	28	#include "rio.h"
	29
	30	static LIST_HEAD(rio_mports);
	31
	32	/**
	33	* rio_local_get_device_id - Get the base/extended device id for a port
	34	* @port: RIO master port from which to get the deviceid
	35	*
	36	* Reads the base/extended device id from the local device
	37	* implementing the master port. Returns the 8/16-bit device
	38	* id.
	39	*/
	40	u16 rio_local_get_device_id(struct rio_mport *port)
	41	{
	42	u32 result;
	43
	44	rio_local_read_config_32(port, RIO_DID_CSR, &result);
	45
	46	return (RIO_GET_DID(result));
	47	}
	48
	49	/**
	50	* rio_request_inb_mbox - request inbound mailbox service
	51	* @mport: RIO master port from which to allocate the mailbox resource
6978bbc0	52	* @dev_id: Device specific pointer to pass on event
394b701c MP	53	* @mbox: Mailbox number to claim
	54	* @entries: Number of entries in inbound mailbox queue
	55	* @minb: Callback to execute when inbound message is received
	56	*
	57	* Requests ownership of an inbound mailbox resource and binds
	58	* a callback function to the resource. Returns %0 on success.
	59	*/
	60	int rio_request_inb_mbox(struct rio_mport *mport,
6978bbc0	61	void *dev_id,
394b701c MP	62	int mbox,
394b701c MP	63	int entries,
6978bbc0	64	void (minb) (struct rio_mport mport, void *dev_id, int mbox,
394b701c MP	65	int slot))
	66	{
	67	int rc = 0;
	68
	69	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
	70
	71	if (res) {
	72	rio_init_mbox_res(res, mbox, mbox);
	73
	74	/* Make sure this mailbox isn't in use */
	75	if ((rc =
	76	request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
	77	res)) < 0) {
	78	kfree(res);
	79	goto out;
	80	}
	81
	82	mport->inb_msg[mbox].res = res;
	83
	84	/* Hook the inbound message callback */
	85	mport->inb_msg[mbox].mcback = minb;
	86
6978bbc0	87	rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
394b701c MP	88	} else
	89	rc = -ENOMEM;
	90
	91	out:
	92	return rc;
	93	}
	94
	95	/**
	96	* rio_release_inb_mbox - release inbound mailbox message service
	97	* @mport: RIO master port from which to release the mailbox resource
	98	* @mbox: Mailbox number to release
	99	*
	100	* Releases ownership of an inbound mailbox resource. Returns 0
	101	* if the request has been satisfied.
	102	*/
	103	int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
	104	{
	105	rio_close_inb_mbox(mport, mbox);
	106
	107	/* Release the mailbox resource */
	108	return release_resource(mport->inb_msg[mbox].res);
	109	}
	110
	111	/**
	112	* rio_request_outb_mbox - request outbound mailbox service
	113	* @mport: RIO master port from which to allocate the mailbox resource
6978bbc0	114	* @dev_id: Device specific pointer to pass on event
394b701c MP	115	* @mbox: Mailbox number to claim
	116	* @entries: Number of entries in outbound mailbox queue
	117	* @moutb: Callback to execute when outbound message is sent
	118	*
	119	* Requests ownership of an outbound mailbox resource and binds
	120	* a callback function to the resource. Returns 0 on success.
	121	*/
	122	int rio_request_outb_mbox(struct rio_mport *mport,
6978bbc0	123	void *dev_id,
394b701c MP	124	int mbox,
394b701c MP	125	int entries,
6978bbc0	126	void (moutb) (struct rio_mport mport, void *dev_id, int mbox, int slot))
394b701c MP	127	{
	128	int rc = 0;
	129
	130	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
	131
	132	if (res) {
	133	rio_init_mbox_res(res, mbox, mbox);
	134
	135	/* Make sure this outbound mailbox isn't in use */
	136	if ((rc =
	137	request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
	138	res)) < 0) {
	139	kfree(res);
	140	goto out;
	141	}
	142
	143	mport->outb_msg[mbox].res = res;
	144
	145	/* Hook the inbound message callback */
	146	mport->outb_msg[mbox].mcback = moutb;
	147
6978bbc0	148	rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
394b701c MP	149	} else
	150	rc = -ENOMEM;
	151
	152	out:
	153	return rc;
	154	}
	155
	156	/**
	157	* rio_release_outb_mbox - release outbound mailbox message service
	158	* @mport: RIO master port from which to release the mailbox resource
	159	* @mbox: Mailbox number to release
	160	*
	161	* Releases ownership of an inbound mailbox resource. Returns 0
	162	* if the request has been satisfied.
	163	*/
	164	int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
	165	{
	166	rio_close_outb_mbox(mport, mbox);
	167
	168	/* Release the mailbox resource */
	169	return release_resource(mport->outb_msg[mbox].res);
	170	}
	171
	172	/**
	173	* rio_setup_inb_dbell - bind inbound doorbell callback
	174	* @mport: RIO master port to bind the doorbell callback
6978bbc0	175	* @dev_id: Device specific pointer to pass on event
394b701c MP	176	* @res: Doorbell message resource
	177	* @dinb: Callback to execute when doorbell is received
	178	*
	179	* Adds a doorbell resource/callback pair into a port's
	180	* doorbell event list. Returns 0 if the request has been
	181	* satisfied.
	182	*/
	183	static int
6978bbc0 MP	184	rio_setup_inb_dbell(struct rio_mport mport, void dev_id, struct resource *res,
6978bbc0 MP	185	void (dinb) (struct rio_mport mport, void *dev_id, u16 src, u16 dst,
394b701c MP	186	u16 info))
	187	{
	188	int rc = 0;
	189	struct rio_dbell *dbell;
	190
	191	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
	192	rc = -ENOMEM;
	193	goto out;
	194	}
	195
	196	dbell->res = res;
	197	dbell->dinb = dinb;
6978bbc0	198	dbell->dev_id = dev_id;
394b701c MP	199
	200	list_add_tail(&dbell->node, &mport->dbells);
	201
	202	out:
	203	return rc;
	204	}
	205
	206	/**
	207	* rio_request_inb_dbell - request inbound doorbell message service
	208	* @mport: RIO master port from which to allocate the doorbell resource
6978bbc0	209	* @dev_id: Device specific pointer to pass on event
394b701c MP	210	* @start: Doorbell info range start
	211	* @end: Doorbell info range end
	212	* @dinb: Callback to execute when doorbell is received
	213	*
	214	* Requests ownership of an inbound doorbell resource and binds
	215	* a callback function to the resource. Returns 0 if the request
	216	* has been satisfied.
	217	*/
	218	int rio_request_inb_dbell(struct rio_mport *mport,
6978bbc0	219	void *dev_id,
394b701c MP	220	u16 start,
394b701c MP	221	u16 end,
6978bbc0	222	void (dinb) (struct rio_mport mport, void *dev_id, u16 src,
394b701c MP	223	u16 dst, u16 info))
	224	{
	225	int rc = 0;
	226
	227	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
	228
	229	if (res) {
	230	rio_init_dbell_res(res, start, end);
	231
	232	/* Make sure these doorbells aren't in use */
	233	if ((rc =
	234	request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
	235	res)) < 0) {
	236	kfree(res);
	237	goto out;
	238	}
	239
	240	/* Hook the doorbell callback */
6978bbc0	241	rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
394b701c MP	242	} else
	243	rc = -ENOMEM;
	244
	245	out:
	246	return rc;
	247	}
	248
	249	/**
	250	* rio_release_inb_dbell - release inbound doorbell message service
	251	* @mport: RIO master port from which to release the doorbell resource
	252	* @start: Doorbell info range start
	253	* @end: Doorbell info range end
	254	*
	255	* Releases ownership of an inbound doorbell resource and removes
	256	* callback from the doorbell event list. Returns 0 if the request
	257	* has been satisfied.
	258	*/
	259	int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
	260	{
	261	int rc = 0, found = 0;
	262	struct rio_dbell *dbell;
	263
	264	list_for_each_entry(dbell, &mport->dbells, node) {
	265	if ((dbell->res->start == start) && (dbell->res->end == end)) {
	266	found = 1;
	267	break;
	268	}
	269	}
	270
	271	/* If we can't find an exact match, fail */
	272	if (!found) {
	273	rc = -EINVAL;
	274	goto out;
	275	}
	276
	277	/* Delete from list */
	278	list_del(&dbell->node);
	279
	280	/* Release the doorbell resource */
	281	rc = release_resource(dbell->res);
	282
	283	/* Free the doorbell event */
	284	kfree(dbell);
	285
	286	out:
	287	return rc;
	288	}
	289
	290	/**
	291	* rio_request_outb_dbell - request outbound doorbell message range
	292	* @rdev: RIO device from which to allocate the doorbell resource
	293	* @start: Doorbell message range start
	294	* @end: Doorbell message range end
	295	*
	296	* Requests ownership of a doorbell message range. Returns a resource
	297	* if the request has been satisfied or %NULL on failure.
	298	*/
	299	struct resource rio_request_outb_dbell(struct rio_dev rdev, u16 start,
	300	u16 end)
	301	{
	302	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
	303
	304	if (res) {
	305	rio_init_dbell_res(res, start, end);
306
307	/* Make sure these doorbells aren't in use */
308	if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
309	< 0) {
310	kfree(res);
311	res = NULL;
312	}
313	}
314
315	return res;
316	}
317
318	/**
319	* rio_release_outb_dbell - release outbound doorbell message range
320	* @rdev: RIO device from which to release the doorbell resource
321	* @res: Doorbell resource to be freed
322	*
323	* Releases ownership of a doorbell message range. Returns 0 if the
324	* request has been satisfied.
325	*/
326	int rio_release_outb_dbell(struct rio_dev rdev, struct resource res)
327	{
328	int rc = release_resource(res);
329
330	kfree(res);
331
332	return rc;
333	}
334
335	/**
336	* rio_mport_get_feature - query for devices' extended features
337	* @port: Master port to issue transaction
338	* @local: Indicate a local master port or remote device access
339	* @destid: Destination ID of the device
340	* @hopcount: Number of switch hops to the device
341	* @ftr: Extended feature code
342	*
343	* Tell if a device supports a given RapidIO capability.
344	* Returns the offset of the requested extended feature
345	* block within the device's RIO configuration space or
346	* 0 in case the device does not support it. Possible
347	* values for @ftr:
348	*
349	* %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
350	*
351	* %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
352	*
353	* %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
354	*
355	* %RIO_EFB_SER_EP_ID LP/Serial EP Devices
356	*
357	* %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
358	*
359	* %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
360	*/
361	u32
362	rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
363	u8 hopcount, int ftr)
364	{
365	u32 asm_info, ext_ftr_ptr, ftr_header;
366
367	if (local)
368	rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
369	else
370	rio_mport_read_config_32(port, destid, hopcount,
371	RIO_ASM_INFO_CAR, &asm_info);
372
373	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
374
375	while (ext_ftr_ptr) {
376	if (local)
377	rio_local_read_config_32(port, ext_ftr_ptr,
378	&ftr_header);
379	else
380	rio_mport_read_config_32(port, destid, hopcount,
381	ext_ftr_ptr, &ftr_header);
382	if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
383	return ext_ftr_ptr;
384	if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
385	break;
386	}
387
388	return 0;
389	}
390
391	/**
392	* rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
393	* @vid: RIO vid to match or %RIO_ANY_ID to match all vids
394	* @did: RIO did to match or %RIO_ANY_ID to match all dids
395	* @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
396	* @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
397	* @from: Previous RIO device found in search, or %NULL for new search
398	*
399	* Iterates through the list of known RIO devices. If a RIO device is
400	* found with a matching @vid, @did, @asm_vid, @asm_did, the reference
401	* count to the device is incrememted and a pointer to its device
402	* structure is returned. Otherwise, %NULL is returned. A new search
403	* is initiated by passing %NULL to the @from argument. Otherwise, if
404	* @from is not %NULL, searches continue from next device on the global
405	* list. The reference count for @from is always decremented if it is
406	* not %NULL.
407	*/
408	struct rio_dev *rio_get_asm(u16 vid, u16 did,
409	u16 asm_vid, u16 asm_did, struct rio_dev *from)
410	{
411	struct list_head *n;
412	struct rio_dev *rdev;
413
414	WARN_ON(in_interrupt());
415	spin_lock(&rio_global_list_lock);
416	n = from ? from->global_list.next : rio_devices.next;
417
418	while (n && (n != &rio_devices)) {
419	rdev = rio_dev_g(n);
420	if ((vid == RIO_ANY_ID \|\| rdev->vid == vid) &&
421	(did == RIO_ANY_ID \|\| rdev->did == did) &&
422	(asm_vid == RIO_ANY_ID \|\| rdev->asm_vid == asm_vid) &&
423	(asm_did == RIO_ANY_ID \|\| rdev->asm_did == asm_did))
424	goto exit;
425	n = n->next;
426	}
427	rdev = NULL;
428	exit:
429	rio_dev_put(from);
430	rdev = rio_dev_get(rdev);
431	spin_unlock(&rio_global_list_lock);
432	return rdev;
433	}
434
435	/**
436	* rio_get_device - Begin or continue searching for a RIO device by vid/did
437	* @vid: RIO vid to match or %RIO_ANY_ID to match all vids
438	* @did: RIO did to match or %RIO_ANY_ID to match all dids
439	* @from: Previous RIO device found in search, or %NULL for new search
440	*
441	* Iterates through the list of known RIO devices. If a RIO device is
442	* found with a matching @vid and @did, the reference count to the
443	* device is incrememted and a pointer to its device structure is returned.
444	* Otherwise, %NULL is returned. A new search is initiated by passing %NULL
445	* to the @from argument. Otherwise, if @from is not %NULL, searches
446	* continue from next device on the global list. The reference count for
447	* @from is always decremented if it is not %NULL.
448	*/
449	struct rio_dev rio_get_device(u16 vid, u16 did, struct rio_dev from)
450	{
451	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
452	}
453
454	static void rio_fixup_device(struct rio_dev *dev)
455	{
456	}
457
458	static int __devinit rio_init(void)
459	{
460	struct rio_dev *dev = NULL;
461
462	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
463	rio_fixup_device(dev);
464	}
465	return 0;
466	}
467
468	device_initcall(rio_init);
469
470	int rio_init_mports(void)
471	{
472	int rc = 0;
473	struct rio_mport *port;
474
475	list_for_each_entry(port, &rio_mports, node) {
476	if (!request_mem_region(port->iores.start,
477	port->iores.end - port->iores.start,
478	port->name)) {
479	printk(KERN_ERR
480	"RIO: Error requesting master port region %8.8lx-%8.8lx\n",
481	port->iores.start, port->iores.end - 1);
482	rc = -ENOMEM;
483	goto out;
484	}
485
486	if (port->host_deviceid >= 0)
487	rio_enum_mport(port);
488	else
489	rio_disc_mport(port);
490	}
491
492	out:
493	return rc;
494	}
495
496	void rio_register_mport(struct rio_mport *port)
497	{
498	list_add_tail(&port->node, &rio_mports);
499	}
500
501	EXPORT_SYMBOL_GPL(rio_local_get_device_id);
502	EXPORT_SYMBOL_GPL(rio_get_device);
503	EXPORT_SYMBOL_GPL(rio_get_asm);
504	EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
505	EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
506	EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
507	EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
508	EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
509	EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
510	EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
511	EXPORT_SYMBOL_GPL(rio_release_outb_mbox);