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/*
* Functions to handle I2O devices
*
* Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com>
*
* 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.
*
* Fixes/additions:
* Markus Lidel <Markus.Lidel@shadowconnect.com>
* initial version.
*/
#include <linux/module.h>
#include <linux/i2o.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "core.h"
/**
* i2o_device_issue_claim - claim or release a device
* @dev: I2O device to claim or release
* @cmd: claim or release command
* @type: type of claim
*
* Issue I2O UTIL_CLAIM or UTIL_RELEASE messages. The message to be sent
* is set by cmd. dev is the I2O device which should be claim or
* released and the type is the claim type (see the I2O spec).
*
* Returs 0 on success or negative error code on failure.
*/
static inline int i2o_device_issue_claim(struct i2o_device *dev, u32 cmd,
u32 type)
{
struct i2o_message *msg;
msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
if (IS_ERR(msg))
return PTR_ERR(msg);
msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
msg->u.head[1] =
cpu_to_le32(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid);
msg->body[0] = cpu_to_le32(type);
return i2o_msg_post_wait(dev->iop, msg, 60);
}
/**
* i2o_device_claim - claim a device for use by an OSM
* @dev: I2O device to claim
* @drv: I2O driver which wants to claim the device
*
* Do the leg work to assign a device to a given OSM. If the claim succeed
* the owner of the rimary. If the attempt fails a negative errno code
* is returned. On success zero is returned.
*/
int i2o_device_claim(struct i2o_device *dev)
{
int rc = 0;
down(&dev->lock);
rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY);
if (!rc)
pr_debug("i2o: claim of device %d succeded\n",
dev->lct_data.tid);
else
pr_debug("i2o: claim of device %d failed %d\n",
dev->lct_data.tid, rc);
up(&dev->lock);
return rc;
}
/**
* i2o_device_claim_release - release a device that the OSM is using
* @dev: device to release
* @drv: driver which claimed the device
*
* Drop a claim by an OSM on a given I2O device.
*
* AC - some devices seem to want to refuse an unclaim until they have
* finished internal processing. It makes sense since you don't want a
* new device to go reconfiguring the entire system until you are done.
* Thus we are prepared to wait briefly.
*
* Returns 0 on success or negative error code on failure.
*/
int i2o_device_claim_release(struct i2o_device *dev)
{
int tries;
int rc = 0;
down(&dev->lock);
/*
* If the controller takes a nonblocking approach to
* releases we have to sleep/poll for a few times.
*/
for (tries = 0; tries < 10; tries++) {
rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_RELEASE,
I2O_CLAIM_PRIMARY);
if (!rc)
break;
ssleep(1);
}
if (!rc)
pr_debug("i2o: claim release of device %d succeded\n",
dev->lct_data.tid);
else
pr_debug("i2o: claim release of device %d failed %d\n",
dev->lct_data.tid, rc);
up(&dev->lock);
return rc;
}
/**
* i2o_device_release - release the memory for a I2O device
* @dev: I2O device which should be released
*
* Release the allocated memory. This function is called if refcount of
* device reaches 0 automatically.
*/
static void i2o_device_release(struct device *dev)
{
struct i2o_device *i2o_dev = to_i2o_device(dev);
pr_debug("i2o: device %s released\n", dev->bus_id);
kfree(i2o_dev);
}
/**
* i2o_device_show_class_id - Displays class id of I2O device
* @dev: device of which the class id should be displayed
* @attr: pointer to device attribute
* @buf: buffer into which the class id should be printed
*
* Returns the number of bytes which are printed into the buffer.
*/
static ssize_t i2o_device_show_class_id(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2o_device *i2o_dev = to_i2o_device(dev);
sprintf(buf, "0x%03x\n", i2o_dev->lct_data.class_id);
return strlen(buf) + 1;
}
/**
* i2o_device_show_tid - Displays TID of I2O device
* @dev: device of which the TID should be displayed
* @attr: pointer to device attribute
* @buf: buffer into which the TID should be printed
*
* Returns the number of bytes which are printed into the buffer.
*/
static ssize_t i2o_device_show_tid(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2o_device *i2o_dev = to_i2o_device(dev);
sprintf(buf, "0x%03x\n", i2o_dev->lct_data.tid);
return strlen(buf) + 1;
}
/* I2O device attributes */
struct device_attribute i2o_device_attrs[] = {
__ATTR(class_id, S_IRUGO, i2o_device_show_class_id, NULL),
__ATTR(tid, S_IRUGO, i2o_device_show_tid, NULL),
__ATTR_NULL
};
/**
* i2o_device_alloc - Allocate a I2O device and initialize it
*
* Allocate the memory for a I2O device and initialize locks and lists
*
* Returns the allocated I2O device or a negative error code if the device
* could not be allocated.
*/
static struct i2o_device *i2o_device_alloc(void)
{
struct i2o_device *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&dev->list);
init_MUTEX(&dev->lock);
dev->device.bus = &i2o_bus_type;
dev->device.release = &i2o_device_release;
return dev;
}
/**
* i2o_device_add - allocate a new I2O device and add it to the IOP
* @iop: I2O controller where the device is on
* @entry: LCT entry of the I2O device
*
* Allocate a new I2O device and initialize it with the LCT entry. The
* device is appended to the device list of the controller.
*
* Returns a pointer to the I2O device on success or negative error code
* on failure.
*/
static struct i2o_device *i2o_device_add(struct i2o_controller *c,
i2o_lct_entry * entry)
{
struct i2o_device *i2o_dev, *tmp;
i2o_dev = i2o_device_alloc();
if (IS_ERR(i2o_dev)) {
printk(KERN_ERR "i2o: unable to allocate i2o device\n");
return i2o_dev;
}
i2o_dev->lct_data = *entry;
snprintf(i2o_dev->device.bus_id, BUS_ID_SIZE, "%d:%03x", c->unit,
i2o_dev->lct_data.tid);
i2o_dev->iop = c;
i2o_dev->device.parent = &c->device;
device_register(&i2o_dev->device);
list_add_tail(&i2o_dev->list, &c->devices);
/* create user entries for this device */
tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
if (tmp && (tmp != i2o_dev))
sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
"user");
/* create user entries refering to this device */
list_for_each_entry(tmp, &c->devices, list)
if ((tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
&& (tmp != i2o_dev))
sysfs_create_link(&tmp->device.kobj,
&i2o_dev->device.kobj, "user");
/* create parent entries for this device */
tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
if (tmp && (tmp != i2o_dev))
sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
"parent");
/* create parent entries refering to this device */
list_for_each_entry(tmp, &c->devices, list)
if ((tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
&& (tmp != i2o_dev))
sysfs_create_link(&tmp->device.kobj,
&i2o_dev->device.kobj, "parent");
i2o_driver_notify_device_add_all(i2o_dev);
pr_debug("i2o: device %s added\n", i2o_dev->device.bus_id);
return i2o_dev;
}
/**
* i2o_device_remove - remove an I2O device from the I2O core
* @dev: I2O device which should be released
*
* Is used on I2O controller removal or LCT modification, when the device
* is removed from the system. Note that the device could still hang
* around until the refcount reaches 0.
*/
void i2o_device_remove(struct i2o_device *i2o_dev)
{
struct i2o_device *tmp;
struct i2o_controller *c
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