diff options
Diffstat (limited to 'drivers/staging/i2o/device.c')
| -rw-r--r-- | drivers/staging/i2o/device.c | 594 |
1 files changed, 594 insertions, 0 deletions
diff --git a/drivers/staging/i2o/device.c b/drivers/staging/i2o/device.c new file mode 100644 index 000000000000..2af22553dd4e --- /dev/null +++ b/drivers/staging/i2o/device.c @@ -0,0 +1,594 @@ +/* + * 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 "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 + * + * Do the leg work to assign a device to a given OSM. If the claim succeeds, + * the owner is the primary. 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; + + mutex_lock(&dev->lock); + + rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY); + if (!rc) + pr_debug("i2o: claim of device %d succeeded\n", + dev->lct_data.tid); + else + pr_debug("i2o: claim of device %d failed %d\n", + dev->lct_data.tid, rc); + + mutex_unlock(&dev->lock); + + return rc; +} + +/** + * i2o_device_claim_release - release a device that the OSM is using + * @dev: device to release + * + * 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; + + mutex_lock(&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 succeeded\n", + dev->lct_data.tid); + else + pr_debug("i2o: claim release of device %d failed %d\n", + dev->lct_data.tid, rc); + + mutex_unlock(&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_name(dev)); + + kfree(i2o_dev); +} + +/** + * class_id_show - 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 class_id_show(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; +} +static DEVICE_ATTR_RO(class_id); + +/** + * tid_show - 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 tid_show(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; +} +static DEVICE_ATTR_RO(tid); + +/* I2O device attributes */ +static struct attribute *i2o_device_attrs[] = { + &dev_attr_class_id.attr, + &dev_attr_tid.attr, + NULL, +}; + +static const struct attribute_group i2o_device_group = { + .attrs = i2o_device_attrs, +}; + +const struct attribute_group *i2o_device_groups[] = { + &i2o_device_group, + 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); + mutex_init(&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 + * @c: I2O controller that 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 zero on success, or a -ve errno. + */ +static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry) +{ + struct i2o_device *i2o_dev, *tmp; + int rc; + + i2o_dev = i2o_device_alloc(); + if (IS_ERR(i2o_dev)) { + printk(KERN_ERR "i2o: unable to allocate i2o device\n"); + return PTR_ERR(i2o_dev); + } + + i2o_dev->lct_data = *entry; + + dev_set_name(&i2o_dev->device, "%d:%03x", c->unit, + i2o_dev->lct_data.tid); + + i2o_dev->iop = c; + i2o_dev->device.parent = &c->device; + + rc = device_register(&i2o_dev->device); + if (rc) + goto err; + + 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)) { + rc = sysfs_create_link(&i2o_dev->device.kobj, + &tmp->device.kobj, "user"); + if (rc) + goto unreg_dev; + } + + /* create user entries referring 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)) { + rc = sysfs_create_link(&tmp->device.kobj, + &i2o_dev->device.kobj, "user"); + if (rc) + goto rmlink1; + } + + /* 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)) { + rc = sysfs_create_link(&i2o_dev->device.kobj, + &tmp->device.kobj, "parent"); + if (rc) + goto rmlink1; + } + + /* create parent entries referring 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)) { + rc = sysfs_create_link(&tmp->device.kobj, + &i2o_dev->device.kobj, "parent"); + if (rc) + goto rmlink2; + } + + i2o_driver_notify_device_add_all(i2o_dev); + + pr_debug("i2o: device %s added\n", dev_name(&i2o_dev->device)); + + return 0; + +rmlink2: + /* If link creating failed halfway, we loop whole list to cleanup. + * And we don't care wrong removing of link, because sysfs_remove_link + * will take care of it. + */ + list_for_each_entry(tmp, &c->devices, list) { + if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid) + sysfs_remove_link(&tmp->device.kobj, "parent"); + } + sysfs_remove_link(&i2o_dev->device.kobj, "parent"); +rmlink1: + list_for_each_entry(tmp, &c->devices, list) + if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid) + sysfs_remove_link(&tmp->device.kobj, "user"); + sysfs_remove_link(&i2o_dev->device.kobj, "user"); +unreg_dev: + list_del(&i2o_dev->list); + device_unregister(&i2o_dev->device); +err: + kfree(i2o_dev); + return rc; +} + +/** + * i2o_device_remove - remove an I2O device from the I2O core + * @i2o_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 = i2o_dev->iop; + + i2o_driver_notify_device_remove_all(i2o_dev); + + sysfs_remove_link(&i2o_dev->device.kobj, "parent"); + sysfs_remove_link(&i2o_dev->device.kobj, "user"); + + list_for_each_entry(tmp, &c->devices, list) { + if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid) + sysfs_remove_link(&tmp->device.kobj, "parent"); + if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid) + sysfs_remove_link(&tmp->device.kobj, "user"); + } + list_del(&i2o_dev->list); + + device_unregister(&i2o_dev->device); +} + +/** + * i2o_device_parse_lct - Parse a previously fetched LCT and create devices + * @c: I2O controller from which the LCT should be parsed. + * + * The Logical Configuration Table tells us what we can talk to on the + * board. For every entry we create an I2O device, which is registered in + * the I2O core. + * + * Returns 0 on success or negative error code on failure. + */ +int i2o_device_parse_lct(struct i2o_controller *c) +{ + struct i2o_device *dev, *tmp; + i2o_lct *lct; + u32 *dlct = c->dlct.virt; + int max = 0, i = 0; + u16 table_size; + u32 buf; + + mutex_lock(&c->lct_lock); + + kfree(c->lct); + + buf = le32_to_cpu(*dlct++); + table_size = buf & 0xffff; + + lct = c->lct = kmalloc(table_size * 4, GFP_KERNEL); + if (!lct) { + mutex_unlock(&c->lct_lock); + return -ENOMEM; + } + + lct->lct_ver = buf >> 28; + lct->boot_tid = buf >> 16 & 0xfff; + lct->table_size = table_size; + lct->change_ind = le32_to_cpu(*dlct++); + lct->iop_flags = le32_to_cpu(*dlct++); + + table_size -= 3; + + pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max, + lct->table_size); + + while (table_size > 0) { + i2o_lct_entry *entry = &lct->lct_entry[max]; + int found = 0; + + buf = le32_to_cpu(*dlct++); + entry->entry_size = buf & 0xffff; + entry->tid = buf >> 16 & 0xfff; + + entry->change_ind = le32_to_cpu(*dlct++); + entry->device_flags = le32_to_cpu(*dlct++); + + buf = le32_to_cpu(*dlct++); + entry->class_id = buf & 0xfff; + entry->version = buf >> 12 & 0xf; + entry->vendor_id = buf >> 16; + + entry->sub_class = le32_to_cpu(*dlct++); + + buf = le32_to_cpu(*dlct++); + entry->user_tid = buf & 0xfff; + entry->parent_tid = buf >> 12 & 0xfff; + entry->bios_info = buf >> 24; + + memcpy(&entry->identity_tag, dlct, 8); + dlct += 2; + + entry->event_capabilities = le32_to_cpu(*dlct++); + + /* add new devices, which are new in the LCT */ + list_for_each_entry_safe(dev, tmp, &c->devices, list) { + if (entry->tid == dev->lct_data.tid) { + found = 1; + break; + } + } + + if (!found) + i2o_device_add(c, entry); + + table_size -= 9; + max++; + } + + /* remove devices, which are not in the LCT anymore */ + list_for_each_entry_safe(dev, tmp, &c->devices, list) { + int found = 0; + + for (i = 0; i < max; i++) { + if (lct->lct_entry[i].tid == dev->lct_data.tid) { + found = 1; + break; + } + } + + if (!found) + i2o_device_remove(dev); + } + + mutex_unlock(&c->lct_lock); + + return 0; +} + +/* + * Run time support routines + */ + +/* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET + * + * This function can be used for all UtilParamsGet/Set operations. + * The OperationList is given in oplist-buffer, + * and results are returned in reslist-buffer. + * Note that the minimum sized reslist is 8 bytes and contains + * ResultCount, ErrorInfoSize, BlockStatus and BlockSize. + */ +int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist, + int oplen, void *reslist, int reslen) +{ + struct i2o_message *msg; + int i = 0; + int rc; + struct i2o_dma res; + struct i2o_controller *c = i2o_dev->iop; + struct device *dev = &c->pdev->dev; + + res.virt = NULL; + + if (i2o_dma_alloc(dev, &res, reslen)) + return -ENOMEM; + + msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); + if (IS_ERR(msg)) { + i2o_dma_free(dev, &res); + return PTR_ERR(msg); + } + + i = 0; + msg->u.head[1] = + cpu_to_le32(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid); + msg->body[i++] = cpu_to_le32(0x00000000); + msg->body[i++] = cpu_to_le32(0x4C000000 | oplen); /* OperationList */ + memcpy(&msg->body[i], oplist, oplen); + i += (oplen / 4 + (oplen % 4 ? 1 : 0)); + msg->body[i++] = cpu_to_le32(0xD0000000 | res.len); /* ResultList */ + msg->body[i++] = cpu_to_le32(res.phys); + + msg->u.head[0] = + cpu_to_le32(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) | + SGL_OFFSET_5); + + rc = i2o_msg_post_wait_mem(c, msg, 10, &res); + + /* This only looks like a memory leak - don't "fix" it. */ + if (rc == -ETIMEDOUT) + return rc; + + memcpy(reslist, res.virt, res.len); + i2o_dma_free(dev, &res); + + return rc; +} + +/* + * Query one field group value or a whole scalar group. + */ +int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field, + void *buf, int buflen) +{ + u32 opblk[] = { cpu_to_le32(0x00000001), + cpu_to_le32((u16) group << 16 | I2O_PARAMS_FIELD_GET), + cpu_to_le32((s16) field << 16 | 0x00000001) + }; + u8 *resblk; /* 8 bytes for header */ + int rc; + + resblk = kmalloc(buflen + 8, GFP_KERNEL); + if (!resblk) + return -ENOMEM; + + rc = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk, + sizeof(opblk), resblk, buflen + 8); + + memcpy(buf, resblk + 8, buflen); /* cut off header */ + + kfree(resblk); + + return rc; +} + +/* + * if oper == I2O_PARAMS_TABLE_GET, get from all rows + * if fieldcount == -1 return all fields + * ibuf and ibuflen are unused (use NULL, 0) + * else return specific fields + * ibuf contains fieldindexes + * + * if oper == I2O_PARAMS_LIST_GET, get from specific rows + * if fieldcount == -1 return all fields + * ibuf contains rowcount, keyvalues + * else return specific fields + * fieldcount is # of fieldindexes + * ibuf contains fieldindexes, rowcount, keyvalues + * + * You could also use directly function i2o_issue_params(). + */ +int i2o_parm_table_get(struct i2o_device *dev, int oper, int group, + int fieldcount, void *ibuf, int ibuflen, void *resblk, + int reslen) +{ + u16 *opblk; + int size; + + size = 10 + ibuflen; + if (size % 4) + size += 4 - size % 4; + + opblk = kmalloc(size, GFP_KERNEL); + if (opblk == NULL) { + printk(KERN_ERR "i2o: no memory for query buffer.\n"); + return -ENOMEM; + } + + opblk[0] = 1; /* operation count */ + opblk[1] = 0; /* pad */ + opblk[2] = oper; + opblk[3] = group; + opblk[4] = fieldcount; + memcpy(opblk + 5, ibuf, ibuflen); /* other params */ + + size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk, + size, resblk, reslen); + + kfree(opblk); + if (size > reslen) + return reslen; + + return size; +} + +EXPORT_SYMBOL(i2o_device_claim); +EXPORT_SYMBOL(i2o_device_claim_release); +EXPORT_SYMBOL(i2o_parm_field_get); +EXPORT_SYMBOL(i2o_parm_table_get); +EXPORT_SYMBOL(i2o_parm_issue); |