2 * Functions to handle I2O controllers and I2O message handling
4 * Copyright (C) 1999-2002 Red Hat Software
6 * Written by Alan Cox, Building Number Three Ltd
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.
13 * A lot of the I2O message side code from this is taken from the
14 * Red Creek RCPCI45 adapter driver by Red Creek Communications
18 * Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
19 * Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
20 * Deepak Saxena <deepak@plexity.net>
21 * Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
22 * Alan Cox <alan@redhat.com>:
23 * Ported to Linux 2.5.
24 * Markus Lidel <Markus.Lidel@shadowconnect.com>:
25 * Minor fixes for 2.6.
28 #include <linux/module.h>
29 #include <linux/i2o.h>
30 #include <linux/delay.h>
33 #define OSM_NAME "i2o"
34 #define OSM_VERSION "1.288"
35 #define OSM_DESCRIPTION "I2O subsystem"
37 /* global I2O controller list */
38 LIST_HEAD(i2o_controllers);
41 * global I2O System Table. Contains information about all the IOPs in the
42 * system. Used to inform IOPs about each others existence.
44 static struct i2o_dma i2o_systab;
46 static int i2o_hrt_get(struct i2o_controller *c);
49 * i2o_msg_nop - Returns a message which is not used
50 * @c: I2O controller from which the message was created
51 * @m: message which should be returned
53 * If you fetch a message via i2o_msg_get, and can't use it, you must
54 * return the message with this function. Otherwise the message frame
57 void i2o_msg_nop(struct i2o_controller *c, u32 m)
59 struct i2o_message __iomem *msg = i2o_msg_in_to_virt(c, m);
61 writel(THREE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
62 writel(I2O_CMD_UTIL_NOP << 24 | HOST_TID << 12 | ADAPTER_TID,
64 writel(0, &msg->u.head[2]);
65 writel(0, &msg->u.head[3]);
70 * i2o_msg_get_wait - obtain an I2O message from the IOP
72 * @msg: pointer to a I2O message pointer
73 * @wait: how long to wait until timeout
75 * This function waits up to wait seconds for a message slot to be
78 * On a success the message is returned and the pointer to the message is
79 * set in msg. The returned message is the physical page frame offset
80 * address from the read port (see the i2o spec). If no message is
81 * available returns I2O_QUEUE_EMPTY and msg is leaved untouched.
83 u32 i2o_msg_get_wait(struct i2o_controller *c,
84 struct i2o_message __iomem ** msg, int wait)
86 unsigned long timeout = jiffies + wait * HZ;
89 while ((m = i2o_msg_get(c, msg)) == I2O_QUEUE_EMPTY) {
90 if (time_after(jiffies, timeout)) {
91 osm_debug("%s: Timeout waiting for message frame.\n",
93 return I2O_QUEUE_EMPTY;
95 set_current_state(TASK_UNINTERRUPTIBLE);
102 #if BITS_PER_LONG == 64
104 * i2o_cntxt_list_add - Append a pointer to context list and return a id
105 * @c: controller to which the context list belong
106 * @ptr: pointer to add to the context list
108 * Because the context field in I2O is only 32-bit large, on 64-bit the
109 * pointer is to large to fit in the context field. The i2o_cntxt_list
110 * functions therefore map pointers to context fields.
112 * Returns context id > 0 on success or 0 on failure.
114 u32 i2o_cntxt_list_add(struct i2o_controller * c, void *ptr)
116 struct i2o_context_list_element *entry;
120 osm_err("%s: couldn't add NULL pointer to context list!\n",
123 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
125 osm_err("%s: Could not allocate memory for context list element"
131 entry->timestamp = jiffies;
132 INIT_LIST_HEAD(&entry->list);
134 spin_lock_irqsave(&c->context_list_lock, flags);
136 if (unlikely(atomic_inc_and_test(&c->context_list_counter)))
137 atomic_inc(&c->context_list_counter);
139 entry->context = atomic_read(&c->context_list_counter);
141 list_add(&entry->list, &c->context_list);
143 spin_unlock_irqrestore(&c->context_list_lock, flags);
145 osm_debug("%s: Add context to list %p -> %d\n", c->name, ptr, context);
147 return entry->context;
151 * i2o_cntxt_list_remove - Remove a pointer from the context list
152 * @c: controller to which the context list belong
153 * @ptr: pointer which should be removed from the context list
155 * Removes a previously added pointer from the context list and returns
156 * the matching context id.
158 * Returns context id on succes or 0 on failure.
160 u32 i2o_cntxt_list_remove(struct i2o_controller * c, void *ptr)
162 struct i2o_context_list_element *entry;
166 spin_lock_irqsave(&c->context_list_lock, flags);
167 list_for_each_entry(entry, &c->context_list, list)
168 if (entry->ptr == ptr) {
169 list_del(&entry->list);
170 context = entry->context;
174 spin_unlock_irqrestore(&c->context_list_lock, flags);
177 osm_warn("%s: Could not remove nonexistent ptr %p\n", c->name,
180 osm_debug("%s: remove ptr from context list %d -> %p\n", c->name,
187 * i2o_cntxt_list_get - Get a pointer from the context list and remove it
188 * @c: controller to which the context list belong
189 * @context: context id to which the pointer belong
191 * Returns pointer to the matching context id on success or NULL on
194 void *i2o_cntxt_list_get(struct i2o_controller *c, u32 context)
196 struct i2o_context_list_element *entry;
200 spin_lock_irqsave(&c->context_list_lock, flags);
201 list_for_each_entry(entry, &c->context_list, list)
202 if (entry->context == context) {
203 list_del(&entry->list);
208 spin_unlock_irqrestore(&c->context_list_lock, flags);
211 osm_warn("%s: context id %d not found\n", c->name, context);
213 osm_debug("%s: get ptr from context list %d -> %p\n", c->name, context,
220 * i2o_cntxt_list_get_ptr - Get a context id from the context list
221 * @c: controller to which the context list belong
222 * @ptr: pointer to which the context id should be fetched
224 * Returns context id which matches to the pointer on succes or 0 on
227 u32 i2o_cntxt_list_get_ptr(struct i2o_controller * c, void *ptr)
229 struct i2o_context_list_element *entry;
233 spin_lock_irqsave(&c->context_list_lock, flags);
234 list_for_each_entry(entry, &c->context_list, list)
235 if (entry->ptr == ptr) {
236 context = entry->context;
239 spin_unlock_irqrestore(&c->context_list_lock, flags);
242 osm_warn("%s: Could not find nonexistent ptr %p\n", c->name,
245 osm_debug("%s: get context id from context list %p -> %d\n", c->name,
253 * i2o_iop_find - Find an I2O controller by id
254 * @unit: unit number of the I2O controller to search for
256 * Lookup the I2O controller on the controller list.
258 * Returns pointer to the I2O controller on success or NULL if not found.
260 struct i2o_controller *i2o_find_iop(int unit)
262 struct i2o_controller *c;
264 list_for_each_entry(c, &i2o_controllers, list) {
273 * i2o_iop_find_device - Find a I2O device on an I2O controller
274 * @c: I2O controller where the I2O device hangs on
275 * @tid: TID of the I2O device to search for
277 * Searches the devices of the I2O controller for a device with TID tid and
280 * Returns a pointer to the I2O device if found, otherwise NULL.
282 struct i2o_device *i2o_iop_find_device(struct i2o_controller *c, u16 tid)
284 struct i2o_device *dev;
286 list_for_each_entry(dev, &c->devices, list)
287 if (dev->lct_data.tid == tid)
294 * i2o_quiesce_controller - quiesce controller
297 * Quiesce an IOP. Causes IOP to make external operation quiescent
298 * (i2o 'READY' state). Internal operation of the IOP continues normally.
300 * Returns 0 on success or negative error code on failure.
302 static int i2o_iop_quiesce(struct i2o_controller *c)
304 struct i2o_message __iomem *msg;
306 i2o_status_block *sb = c->status_block.virt;
311 /* SysQuiesce discarded if IOP not in READY or OPERATIONAL state */
312 if ((sb->iop_state != ADAPTER_STATE_READY) &&
313 (sb->iop_state != ADAPTER_STATE_OPERATIONAL))
316 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
317 if (m == I2O_QUEUE_EMPTY)
320 writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
321 writel(I2O_CMD_SYS_QUIESCE << 24 | HOST_TID << 12 | ADAPTER_TID,
324 /* Long timeout needed for quiesce if lots of devices */
325 if ((rc = i2o_msg_post_wait(c, m, 240)))
326 osm_info("%s: Unable to quiesce (status=%#x).\n", c->name, -rc);
328 osm_debug("%s: Quiesced.\n", c->name);
330 i2o_status_get(c); // Entered READY state
336 * i2o_iop_enable - move controller from ready to OPERATIONAL
339 * Enable IOP. This allows the IOP to resume external operations and
340 * reverses the effect of a quiesce. Returns zero or an error code if
343 static int i2o_iop_enable(struct i2o_controller *c)
345 struct i2o_message __iomem *msg;
347 i2o_status_block *sb = c->status_block.virt;
352 /* Enable only allowed on READY state */
353 if (sb->iop_state != ADAPTER_STATE_READY)
356 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
357 if (m == I2O_QUEUE_EMPTY)
360 writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
361 writel(I2O_CMD_SYS_ENABLE << 24 | HOST_TID << 12 | ADAPTER_TID,
364 /* How long of a timeout do we need? */
365 if ((rc = i2o_msg_post_wait(c, m, 240)))
366 osm_err("%s: Could not enable (status=%#x).\n", c->name, -rc);
368 osm_debug("%s: Enabled.\n", c->name);
370 i2o_status_get(c); // entered OPERATIONAL state
376 * i2o_iop_quiesce_all - Quiesce all I2O controllers on the system
378 * Quiesce all I2O controllers which are connected to the system.
380 static inline void i2o_iop_quiesce_all(void)
382 struct i2o_controller *c, *tmp;
384 list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
391 * i2o_iop_enable_all - Enables all controllers on the system
393 * Enables all I2O controllers which are connected to the system.
395 static inline void i2o_iop_enable_all(void)
397 struct i2o_controller *c, *tmp;
399 list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
404 * i2o_clear_controller - Bring I2O controller into HOLD state
407 * Clear an IOP to HOLD state, ie. terminate external operations, clear all
408 * input queues and prepare for a system restart. IOP's internal operation
409 * continues normally and the outbound queue is alive. The IOP is not
410 * expected to rebuild its LCT.
412 * Returns 0 on success or negative error code on failure.
414 static int i2o_iop_clear(struct i2o_controller *c)
416 struct i2o_message __iomem *msg;
420 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
421 if (m == I2O_QUEUE_EMPTY)
424 /* Quiesce all IOPs first */
425 i2o_iop_quiesce_all();
427 writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
428 writel(I2O_CMD_ADAPTER_CLEAR << 24 | HOST_TID << 12 | ADAPTER_TID,
431 if ((rc = i2o_msg_post_wait(c, m, 30)))
432 osm_info("%s: Unable to clear (status=%#x).\n", c->name, -rc);
434 osm_debug("%s: Cleared.\n", c->name);
436 /* Enable all IOPs */
437 i2o_iop_enable_all();
443 * i2o_iop_init_outbound_queue - setup the outbound message queue
446 * Clear and (re)initialize IOP's outbound queue and post the message
449 * Returns 0 on success or a negative errno code on failure.
451 static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
453 volatile u8 *status = c->status.virt;
455 struct i2o_message __iomem *msg;
459 osm_debug("%s: Initializing Outbound Queue...\n", c->name);
461 memset(c->status.virt, 0, 4);
463 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
464 if (m == I2O_QUEUE_EMPTY)
467 writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6, &msg->u.head[0]);
468 writel(I2O_CMD_OUTBOUND_INIT << 24 | HOST_TID << 12 | ADAPTER_TID,
470 writel(i2o_exec_driver.context, &msg->u.s.icntxt);
471 writel(0x00000000, &msg->u.s.tcntxt);
472 writel(PAGE_SIZE, &msg->body[0]);
473 /* Outbound msg frame size in words and Initcode */
474 writel(I2O_OUTBOUND_MSG_FRAME_SIZE << 16 | 0x80, &msg->body[1]);
475 writel(0xd0000004, &msg->body[2]);
476 writel(i2o_dma_low(c->status.phys), &msg->body[3]);
477 writel(i2o_dma_high(c->status.phys), &msg->body[4]);
481 timeout = jiffies + I2O_TIMEOUT_INIT_OUTBOUND_QUEUE * HZ;
482 while (*status <= I2O_CMD_IN_PROGRESS) {
483 if (time_after(jiffies, timeout)) {
484 osm_warn("%s: Timeout Initializing\n", c->name);
487 set_current_state(TASK_UNINTERRUPTIBLE);
491 m = c->out_queue.phys;
494 for (i = 0; i < I2O_MAX_OUTBOUND_MSG_FRAMES; i++) {
495 i2o_flush_reply(c, m);
496 udelay(1); /* Promise */
497 m += I2O_OUTBOUND_MSG_FRAME_SIZE * sizeof(u32);
504 * i2o_iop_reset - reset an I2O controller
505 * @c: controller to reset
507 * Reset the IOP into INIT state and wait until IOP gets into RESET state.
508 * Terminate all external operations, clear IOP's inbound and outbound
509 * queues, terminate all DDMs, and reload the IOP's operating environment
510 * and all local DDMs. The IOP rebuilds its LCT.
512 static int i2o_iop_reset(struct i2o_controller *c)
514 volatile u8 *status = c->status.virt;
515 struct i2o_message __iomem *msg;
517 unsigned long timeout;
518 i2o_status_block *sb = c->status_block.virt;
521 osm_debug("%s: Resetting controller\n", c->name);
523 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
524 if (m == I2O_QUEUE_EMPTY)
527 memset(c->status_block.virt, 0, 8);
529 /* Quiesce all IOPs first */
530 i2o_iop_quiesce_all();
532 writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
533 writel(I2O_CMD_ADAPTER_RESET << 24 | HOST_TID << 12 | ADAPTER_TID,
535 writel(i2o_exec_driver.context, &msg->u.s.icntxt);
536 writel(0, &msg->u.s.tcntxt); //FIXME: use reasonable transaction context
537 writel(0, &msg->body[0]);
538 writel(0, &msg->body[1]);
539 writel(i2o_dma_low(c->status.phys), &msg->body[2]);
540 writel(i2o_dma_high(c->status.phys), &msg->body[3]);
544 /* Wait for a reply */
545 timeout = jiffies + I2O_TIMEOUT_RESET * HZ;
547 if (time_after(jiffies, timeout))
550 set_current_state(TASK_UNINTERRUPTIBLE);
555 case I2O_CMD_REJECTED:
556 osm_warn("%s: IOP reset rejected\n", c->name);
560 case I2O_CMD_IN_PROGRESS:
562 * Once the reset is sent, the IOP goes into the INIT state
563 * which is indeterminate. We need to wait until the IOP has
564 * rebooted before we can let the system talk to it. We read
565 * the inbound Free_List until a message is available. If we
566 * can't read one in the given ammount of time, we assume the
567 * IOP could not reboot properly.
569 osm_debug("%s: Reset in progress, waiting for reboot...\n",
572 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_RESET);
573 while (m == I2O_QUEUE_EMPTY) {
574 if (time_after(jiffies, timeout)) {
575 osm_err("%s: IOP reset timeout.\n", c->name);
579 set_current_state(TASK_UNINTERRUPTIBLE);
582 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_RESET);
586 /* from here all quiesce commands are safe */
589 /* verify if controller is in state RESET */
592 if (!c->promise && (sb->iop_state != ADAPTER_STATE_RESET))
593 osm_warn("%s: reset completed, but adapter not in RESET"
594 " state.\n", c->name);
596 osm_debug("%s: reset completed.\n", c->name);
601 osm_err("%s: IOP reset timeout.\n", c->name);
607 /* Enable all IOPs */
608 i2o_iop_enable_all();
614 * i2o_iop_activate - Bring controller up to HOLD
617 * This function brings an I2O controller into HOLD state. The adapter
618 * is reset if necessary and then the queues and resource table are read.
620 * Returns 0 on success or negative error code on failure.
622 static int i2o_iop_activate(struct i2o_controller *c)
624 i2o_status_block *sb = c->status_block.virt;
628 /* In INIT state, Wait Inbound Q to initialize (in i2o_status_get) */
629 /* In READY state, Get status */
631 rc = i2o_status_get(c);
633 osm_info("%s: Unable to obtain status, attempting a reset.\n",
635 rc = i2o_iop_reset(c);
640 if (sb->i2o_version > I2OVER15) {
641 osm_err("%s: Not running version 1.5 of the I2O Specification."
646 switch (sb->iop_state) {
647 case ADAPTER_STATE_FAULTED:
648 osm_err("%s: hardware fault\n", c->name);
651 case ADAPTER_STATE_READY:
652 case ADAPTER_STATE_OPERATIONAL:
653 case ADAPTER_STATE_HOLD:
654 case ADAPTER_STATE_FAILED:
655 osm_debug("%s: already running, trying to reset...\n", c->name);
656 rc = i2o_iop_reset(c);
662 state = sb->iop_state;
664 rc = i2o_iop_init_outbound_queue(c);
668 /* if adapter was not in RESET state clear now */
669 if (state != ADAPTER_STATE_RESET)
674 if (sb->iop_state != ADAPTER_STATE_HOLD) {
675 osm_err("%s: failed to bring IOP into HOLD state\n", c->name);
679 return i2o_hrt_get(c);
683 * i2o_iop_systab_set - Set the I2O System Table of the specified IOP
684 * @c: I2O controller to which the system table should be send
686 * Before the systab could be set i2o_systab_build() must be called.
688 * Returns 0 on success or negative error code on failure.
690 static int i2o_iop_systab_set(struct i2o_controller *c)
692 struct i2o_message __iomem *msg;
694 i2o_status_block *sb = c->status_block.virt;
695 struct device *dev = &c->pdev->dev;
696 struct resource *root;
699 if (sb->current_mem_size < sb->desired_mem_size) {
700 struct resource *res = &c->mem_resource;
701 res->name = c->pdev->bus->name;
702 res->flags = IORESOURCE_MEM;
705 osm_info("%s: requires private memory resources.\n", c->name);
706 root = pci_find_parent_resource(c->pdev, res);
708 osm_warn("%s: Can't find parent resource!\n", c->name);
709 if (root && allocate_resource(root, res, sb->desired_mem_size, sb->desired_mem_size, sb->desired_mem_size, 1 << 20, /* Unspecified, so use 1Mb and play safe */
712 sb->current_mem_size = 1 + res->end - res->start;
713 sb->current_mem_base = res->start;
714 osm_info("%s: allocated %ld bytes of PCI memory at "
715 "0x%08lX.\n", c->name,
716 1 + res->end - res->start, res->start);
720 if (sb->current_io_size < sb->desired_io_size) {
721 struct resource *res = &c->io_resource;
722 res->name = c->pdev->bus->name;
723 res->flags = IORESOURCE_IO;
726 osm_info("%s: requires private memory resources.\n", c->name);
727 root = pci_find_parent_resource(c->pdev, res);
729 osm_warn("%s: Can't find parent resource!\n", c->name);
730 if (root && allocate_resource(root, res, sb->desired_io_size, sb->desired_io_size, sb->desired_io_size, 1 << 20, /* Unspecified, so use 1Mb and play safe */
733 sb->current_io_size = 1 + res->end - res->start;
734 sb->current_mem_base = res->start;
735 osm_info("%s: allocated %ld bytes of PCI I/O at 0x%08lX"
736 ".\n", c->name, 1 + res->end - res->start,
741 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
742 if (m == I2O_QUEUE_EMPTY)
745 i2o_systab.phys = dma_map_single(dev, i2o_systab.virt, i2o_systab.len,
747 if (!i2o_systab.phys) {
752 writel(I2O_MESSAGE_SIZE(12) | SGL_OFFSET_6, &msg->u.head[0]);
753 writel(I2O_CMD_SYS_TAB_SET << 24 | HOST_TID << 12 | ADAPTER_TID,
757 * Provide three SGL-elements:
758 * System table (SysTab), Private memory space declaration and
759 * Private i/o space declaration
761 * FIXME: is this still true?
762 * Nasty one here. We can't use dma_alloc_coherent to send the
763 * same table to everyone. We have to go remap it for them all
766 writel(c->unit + 2, &msg->body[0]);
767 writel(0, &msg->body[1]);
768 writel(0x54000000 | i2o_systab.len, &msg->body[2]);
769 writel(i2o_systab.phys, &msg->body[3]);
770 writel(0x54000000 | sb->current_mem_size, &msg->body[4]);
771 writel(sb->current_mem_base, &msg->body[5]);
772 writel(0xd4000000 | sb->current_io_size, &msg->body[6]);
773 writel(sb->current_io_base, &msg->body[6]);
775 rc = i2o_msg_post_wait(c, m, 120);
777 dma_unmap_single(dev, i2o_systab.phys, i2o_systab.len,
781 osm_err("%s: Unable to set SysTab (status=%#x).\n", c->name,
784 osm_debug("%s: SysTab set.\n", c->name);
786 i2o_status_get(c); // Entered READY state
792 * i2o_iop_online - Bring a controller online into OPERATIONAL state.
795 * Send the system table and enable the I2O controller.
797 * Returns 0 on success or negativer error code on failure.
799 static int i2o_iop_online(struct i2o_controller *c)
803 rc = i2o_iop_systab_set(c);
808 osm_debug("%s: Attempting to enable...\n", c->name);
809 rc = i2o_iop_enable(c);
817 * i2o_iop_remove - Remove the I2O controller from the I2O core
820 * Remove the I2O controller from the I2O core. If devices are attached to
821 * the controller remove these also and finally reset the controller.
823 void i2o_iop_remove(struct i2o_controller *c)
825 struct i2o_device *dev, *tmp;
827 osm_debug("%s: deleting controller\n", c->name);
829 i2o_driver_notify_controller_remove_all(c);
833 list_for_each_entry_safe(dev, tmp, &c->devices, list)
834 i2o_device_remove(dev);
836 class_device_unregister(c->classdev);
837 device_del(&c->device);
839 /* Ask the IOP to switch to RESET state */
842 put_device(&c->device);
846 * i2o_systab_build - Build system table
848 * The system table contains information about all the IOPs in the system
849 * (duh) and is used by the Executives on the IOPs to establish peer2peer
850 * connections. We're not supporting peer2peer at the moment, but this
851 * will be needed down the road for things like lan2lan forwarding.
853 * Returns 0 on success or negative error code on failure.
855 static int i2o_systab_build(void)
857 struct i2o_controller *c, *tmp;
858 int num_controllers = 0;
861 struct i2o_sys_tbl *systab = i2o_systab.virt;
863 list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
867 change_ind = systab->change_ind;
868 kfree(i2o_systab.virt);
872 i2o_systab.len = sizeof(struct i2o_sys_tbl) + num_controllers *
873 sizeof(struct i2o_sys_tbl_entry);
875 systab = i2o_systab.virt = kmalloc(i2o_systab.len, GFP_KERNEL);
877 osm_err("unable to allocate memory for System Table\n");
880 memset(systab, 0, i2o_systab.len);
882 systab->version = I2OVERSION;
883 systab->change_ind = change_ind + 1;
885 list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
886 i2o_status_block *sb;
888 if (count >= num_controllers) {
889 osm_err("controller added while building system table"
894 sb = c->status_block.virt;
897 * Get updated IOP state so we have the latest information
899 * We should delete the controller at this point if it
900 * doesn't respond since if it's not on the system table
901 * it is techninically not part of the I2O subsystem...
903 if (unlikely(i2o_status_get(c))) {
904 osm_err("%s: Deleting b/c could not get status while "
905 "attempting to build system table\n", c->name);
907 continue; // try the next one
910 systab->iops[count].org_id = sb->org_id;
911 systab->iops[count].iop_id = c->unit + 2;
912 systab->iops[count].seg_num = 0;
913 systab->iops[count].i2o_version = sb->i2o_version;
914 systab->iops[count].iop_state = sb->iop_state;
915 systab->iops[count].msg_type = sb->msg_type;
916 systab->iops[count].frame_size = sb->inbound_frame_size;
917 systab->iops[count].last_changed = change_ind;
918 systab->iops[count].iop_capabilities = sb->iop_capabilities;
919 systab->iops[count].inbound_low =
920 i2o_dma_low(c->base.phys + I2O_IN_PORT);
921 systab->iops[count].inbound_high =
922 i2o_dma_high(c->base.phys + I2O_IN_PORT);
927 systab->num_entries = count;
933 * i2o_parse_hrt - Parse the hardware resource table.
936 * We don't do anything with it except dumping it (in debug mode).
940 static int i2o_parse_hrt(struct i2o_controller *c)
947 * i2o_status_get - Get the status block from the I2O controller
950 * Issue a status query on the controller. This updates the attached
951 * status block. The status block could then be accessed through
954 * Returns 0 on sucess or negative error code on failure.
956 int i2o_status_get(struct i2o_controller *c)
958 struct i2o_message __iomem *msg;
960 volatile u8 *status_block;
961 unsigned long timeout;
963 status_block = (u8 *) c->status_block.virt;
964 memset(c->status_block.virt, 0, sizeof(i2o_status_block));
966 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
967 if (m == I2O_QUEUE_EMPTY)
970 writel(NINE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
971 writel(I2O_CMD_STATUS_GET << 24 | HOST_TID << 12 | ADAPTER_TID,
973 writel(i2o_exec_driver.context, &msg->u.s.icntxt);
974 writel(0, &msg->u.s.tcntxt); // FIXME: use resonable transaction context
975 writel(0, &msg->body[0]);
976 writel(0, &msg->body[1]);
977 writel(i2o_dma_low(c->status_block.phys), &msg->body[2]);
978 writel(i2o_dma_high(c->status_block.phys), &msg->body[3]);
979 writel(sizeof(i2o_status_block), &msg->body[4]); /* always 88 bytes */
983 /* Wait for a reply */
984 timeout = jiffies + I2O_TIMEOUT_STATUS_GET * HZ;
985 while (status_block[87] != 0xFF) {
986 if (time_after(jiffies, timeout)) {
987 osm_err("%s: Get status timeout.\n", c->name);
991 set_current_state(TASK_UNINTERRUPTIBLE);
1003 * i2o_hrt_get - Get the Hardware Resource Table from the I2O controller
1004 * @c: I2O controller from which the HRT should be fetched
1006 * The HRT contains information about possible hidden devices but is
1007 * mostly useless to us.
1009 * Returns 0 on success or negativer error code on failure.
1011 static int i2o_hrt_get(struct i2o_controller *c)
1015 i2o_hrt *hrt = c->hrt.virt;
1016 u32 size = sizeof(i2o_hrt);
1017 struct device *dev = &c->pdev->dev;
1019 for (i = 0; i < I2O_HRT_GET_TRIES; i++) {
1020 struct i2o_message __iomem *msg;
1023 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
1024 if (m == I2O_QUEUE_EMPTY)
1027 writel(SIX_WORD_MSG_SIZE | SGL_OFFSET_4, &msg->u.head[0]);
1028 writel(I2O_CMD_HRT_GET << 24 | HOST_TID << 12 | ADAPTER_TID,
1030 writel(0xd0000000 | c->hrt.len, &msg->body[0]);
1031 writel(c->hrt.phys, &msg->body[1]);
1033 rc = i2o_msg_post_wait_mem(c, m, 20, &c->hrt);
1036 osm_err("%s: Unable to get HRT (status=%#x)\n", c->name,
1041 size = hrt->num_entries * hrt->entry_len << 2;
1042 if (size > c->hrt.len) {
1043 if (i2o_dma_realloc(dev, &c->hrt, size, GFP_KERNEL))
1048 return i2o_parse_hrt(c);
1051 osm_err("%s: Unable to get HRT after %d tries, giving up\n", c->name,
1058 * i2o_iop_free - Free the i2o_controller struct
1059 * @c: I2O controller to free
1061 void i2o_iop_free(struct i2o_controller *c)
1067 * i2o_iop_release - release the memory for a I2O controller
1068 * @dev: I2O controller which should be released
1070 * Release the allocated memory. This function is called if refcount of
1071 * device reaches 0 automatically.
1073 static void i2o_iop_release(struct device *dev)
1075 struct i2o_controller *c = to_i2o_controller(dev);
1080 /* I2O controller class */
1081 static struct class *i2o_controller_class;
1084 * i2o_iop_alloc - Allocate and initialize a i2o_controller struct
1086 * Allocate the necessary memory for a i2o_controller struct and
1087 * initialize the lists.
1089 * Returns a pointer to the I2O controller or a negative error code on
1092 struct i2o_controller *i2o_iop_alloc(void)
1094 static int unit = 0; /* 0 and 1 are NULL IOP and Local Host */
1095 struct i2o_controller *c;
1097 c = kmalloc(sizeof(*c), GFP_KERNEL);
1099 osm_err("i2o: Insufficient memory to allocate a I2O controller."
1101 return ERR_PTR(-ENOMEM);
1103 memset(c, 0, sizeof(*c));
1105 INIT_LIST_HEAD(&c->devices);
1106 spin_lock_init(&c->lock);
1107 init_MUTEX(&c->lct_lock);
1109 sprintf(c->name, "iop%d", c->unit);
1111 device_initialize(&c->device);
1113 c->device.release = &i2o_iop_release;
1115 snprintf(c->device.bus_id, BUS_ID_SIZE, "iop%d", c->unit);
1117 #if BITS_PER_LONG == 64
1118 spin_lock_init(&c->context_list_lock);
1119 atomic_set(&c->context_list_counter, 0);
1120 INIT_LIST_HEAD(&c->context_list);
1127 * i2o_iop_add - Initialize the I2O controller and add him to the I2O core
1130 * Initialize the I2O controller and if no error occurs add him to the I2O
1133 * Returns 0 on success or negative error code on failure.
1135 int i2o_iop_add(struct i2o_controller *c)
1139 if ((rc = device_add(&c->device))) {
1140 osm_err("%s: could not add controller\n", c->name);
1144 c->classdev = class_device_create(i2o_controller_class, 0,
1145 &c->device, "iop%d", c->unit);
1146 if (IS_ERR(c->classdev)) {
1147 osm_err("%s: could not add controller class\n", c->name);
1151 osm_info("%s: Activating I2O controller...\n", c->name);
1152 osm_info("%s: This may take a few minutes if there are many devices\n",
1155 if ((rc = i2o_iop_activate(c))) {
1156 osm_err("%s: could not activate controller\n", c->name);
1160 osm_debug("%s: building sys table...\n", c->name);
1162 if ((rc = i2o_systab_build()))
1165 osm_debug("%s: online controller...\n", c->name);
1167 if ((rc = i2o_iop_online(c)))
1170 osm_debug("%s: getting LCT...\n", c->name);
1172 if ((rc = i2o_exec_lct_get(c)))
1175 list_add(&c->list, &i2o_controllers);
1177 i2o_driver_notify_controller_add_all(c);
1179 osm_info("%s: Controller added\n", c->name);
1184 class_device_unregister(c->classdev);
1187 device_del(&c->device);
1196 * i2o_event_register - Turn on/off event notification for a I2O device
1197 * @dev: I2O device which should receive the event registration request
1198 * @drv: driver which want to get notified
1199 * @tcntxt: transaction context to use with this notifier
1200 * @evt_mask: mask of events
1202 * Create and posts an event registration message to the task. No reply
1203 * is waited for, or expected. If you do not want further notifications,
1204 * call the i2o_event_register again with a evt_mask of 0.
1206 * Returns 0 on success or -ETIMEDOUT if no message could be fetched for
1207 * sending the request.
1209 int i2o_event_register(struct i2o_device *dev, struct i2o_driver *drv,
1210 int tcntxt, u32 evt_mask)
1212 struct i2o_controller *c = dev->iop;
1213 struct i2o_message __iomem *msg;
1216 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
1217 if (m == I2O_QUEUE_EMPTY)
1220 writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
1221 writel(I2O_CMD_UTIL_EVT_REGISTER << 24 | HOST_TID << 12 | dev->lct_data.
1222 tid, &msg->u.head[1]);
1223 writel(drv->context, &msg->u.s.icntxt);
1224 writel(tcntxt, &msg->u.s.tcntxt);
1225 writel(evt_mask, &msg->body[0]);
1233 * i2o_iop_init - I2O main initialization function
1235 * Initialize the I2O drivers (OSM) functions, register the Executive OSM,
1236 * initialize the I2O PCI part and finally initialize I2O device stuff.
1238 * Returns 0 on success or negative error code on failure.
1240 static int __init i2o_iop_init(void)
1244 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
1246 rc = i2o_device_init();
1250 i2o_controller_class = class_create(THIS_MODULE, "i2o_controller");
1251 if (IS_ERR(i2o_controller_class)) {
1252 osm_err("can't register class i2o_controller\n");
1256 if ((rc = i2o_driver_init()))
1259 if ((rc = i2o_exec_init()))
1262 if ((rc = i2o_pci_init()))
1274 class_destroy(i2o_controller_class);
1284 * i2o_iop_exit - I2O main exit function
1286 * Removes I2O controllers from PCI subsystem and shut down OSMs.
1288 static void __exit i2o_iop_exit(void)
1293 class_destroy(i2o_controller_class);
1297 module_init(i2o_iop_init);
1298 module_exit(i2o_iop_exit);
1300 MODULE_AUTHOR("Red Hat Software");
1301 MODULE_LICENSE("GPL");
1302 MODULE_DESCRIPTION(OSM_DESCRIPTION);
1303 MODULE_VERSION(OSM_VERSION);
1305 #if BITS_PER_LONG == 64
1306 EXPORT_SYMBOL(i2o_cntxt_list_add);
1307 EXPORT_SYMBOL(i2o_cntxt_list_get);
1308 EXPORT_SYMBOL(i2o_cntxt_list_remove);
1309 EXPORT_SYMBOL(i2o_cntxt_list_get_ptr);
1311 EXPORT_SYMBOL(i2o_msg_get_wait);
1312 EXPORT_SYMBOL(i2o_msg_nop);
1313 EXPORT_SYMBOL(i2o_find_iop);
1314 EXPORT_SYMBOL(i2o_iop_find_device);
1315 EXPORT_SYMBOL(i2o_event_register);
1316 EXPORT_SYMBOL(i2o_status_get);
1317 EXPORT_SYMBOL(i2o_controllers);