/*
* RapidIO interconnect services
* (RapidIO Interconnect Specification, http://www.rapidio.org)
*
* 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/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 <linux/interrupt.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(port->sys_size, 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 0x%016llx-0x%016llx\n",
(u64)port->iores.start, (u64)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);
