4 * The interface to the IPMI driver for SMBus access to a SMBus
5 * compliant device. Called SSIF by the IPMI spec.
7 * Author: Intel Corporation
8 * Todd Davis <todd.c.davis@intel.com>
10 * Rewritten by Corey Minyard <minyard@acm.org> to support the
11 * non-blocking I2C interface, add support for multi-part
12 * transactions, add PEC support, and general clenaup.
14 * Copyright 2003 Intel Corporation
15 * Copyright 2005 MontaVista Software
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2 of the License, or (at your
20 * option) any later version.
24 * This file holds the "policy" for the interface to the SSIF state
25 * machine. It does the configuration, handles timers and interrupts,
26 * and drives the real SSIF state machine.
30 * TODO: Figure out how to use SMB alerts. This will require a new
31 * interface into the I2C driver, I believe.
34 #include <linux/version.h>
35 #if defined(MODVERSIONS)
36 #include <linux/modversions.h>
39 #include <linux/module.h>
40 #include <linux/moduleparam.h>
41 #include <linux/sched.h>
42 #include <linux/seq_file.h>
43 #include <linux/timer.h>
44 #include <linux/delay.h>
45 #include <linux/errno.h>
46 #include <linux/spinlock.h>
47 #include <linux/slab.h>
48 #include <linux/list.h>
49 #include <linux/i2c.h>
50 #include <linux/ipmi_smi.h>
51 #include <linux/init.h>
52 #include <linux/dmi.h>
53 #include <linux/kthread.h>
54 #include <linux/acpi.h>
56 #define PFX "ipmi_ssif: "
57 #define DEVICE_NAME "ipmi_ssif"
59 #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
61 #define SSIF_IPMI_REQUEST 2
62 #define SSIF_IPMI_MULTI_PART_REQUEST_START 6
63 #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
64 #define SSIF_IPMI_RESPONSE 3
65 #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
67 /* ssif_debug is a bit-field
68 * SSIF_DEBUG_MSG - commands and their responses
69 * SSIF_DEBUG_STATES - message states
70 * SSIF_DEBUG_TIMING - Measure times between events in the driver
72 #define SSIF_DEBUG_TIMING 4
73 #define SSIF_DEBUG_STATE 2
74 #define SSIF_DEBUG_MSG 1
75 #define SSIF_NODEBUG 0
76 #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
81 #define SSIF_MSG_USEC 20000 /* 20ms between message tries. */
82 #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
84 /* How many times to we retry sending/receiving the message. */
85 #define SSIF_SEND_RETRIES 5
86 #define SSIF_RECV_RETRIES 250
88 #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
89 #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
90 #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
92 enum ssif_intf_state {
97 SSIF_GETTING_MESSAGES,
98 /* FIXME - add watchdog stuff. */
101 #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \
102 && (ssif)->curr_msg == NULL)
105 * Indexes into stats[] in ssif_info below.
107 enum ssif_stat_indexes {
108 /* Number of total messages sent. */
109 SSIF_STAT_sent_messages = 0,
112 * Number of message parts sent. Messages may be broken into
113 * parts if they are long.
115 SSIF_STAT_sent_messages_parts,
118 * Number of time a message was retried.
120 SSIF_STAT_send_retries,
123 * Number of times the send of a message failed.
125 SSIF_STAT_send_errors,
128 * Number of message responses received.
130 SSIF_STAT_received_messages,
133 * Number of message fragments received.
135 SSIF_STAT_received_message_parts,
138 * Number of times the receive of a message was retried.
140 SSIF_STAT_receive_retries,
143 * Number of errors receiving messages.
145 SSIF_STAT_receive_errors,
148 * Number of times a flag fetch was requested.
150 SSIF_STAT_flag_fetches,
153 * Number of times the hardware didn't follow the state machine.
158 * Number of received events.
162 /* Number of asyncronous messages received. */
163 SSIF_STAT_incoming_messages,
165 /* Number of watchdog pretimeouts. */
166 SSIF_STAT_watchdog_pretimeouts,
168 /* Always add statistics before this value, it must be last. */
172 struct ssif_addr_info {
174 struct i2c_board_info binfo;
178 enum ipmi_addr_src addr_src;
179 union ipmi_smi_info_union addr_info;
181 struct mutex clients_mutex;
182 struct list_head clients;
184 struct list_head link;
189 typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
190 unsigned char *data, unsigned int len);
196 struct ipmi_smi_msg *waiting_msg;
197 struct ipmi_smi_msg *curr_msg;
198 enum ssif_intf_state ssif_state;
199 unsigned long ssif_debug;
201 struct ipmi_smi_handlers handlers;
203 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
204 union ipmi_smi_info_union addr_info;
207 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
208 * is set to hold the flags until we are done handling everything
211 #define RECEIVE_MSG_AVAIL 0x01
212 #define EVENT_MSG_BUFFER_FULL 0x02
213 #define WDT_PRE_TIMEOUT_INT 0x08
214 unsigned char msg_flags;
216 bool has_event_buffer;
219 * If set to true, this will request events the next time the
220 * state machine is idle.
225 * If set to true, this will request flags the next time the
226 * state machine is idle.
231 * Used to perform timer operations when run-to-completion
232 * mode is on. This is a countdown timer.
236 /* Used for sending/receiving data. +1 for the length. */
237 unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
238 unsigned int data_len;
240 /* Temp receive buffer, gets copied into data. */
241 unsigned char recv[I2C_SMBUS_BLOCK_MAX];
243 struct i2c_client *client;
244 ssif_i2c_done done_handler;
246 /* Thread interface handling */
247 struct task_struct *thread;
248 struct completion wake_thread;
252 unsigned char *i2c_data;
253 unsigned int i2c_size;
255 /* From the device id response. */
256 struct ipmi_device_id device_id;
258 struct timer_list retry_timer;
261 /* Info from SSIF cmd */
262 unsigned char max_xmit_msg_size;
263 unsigned char max_recv_msg_size;
264 unsigned int multi_support;
267 #define SSIF_NO_MULTI 0
268 #define SSIF_MULTI_2_PART 1
269 #define SSIF_MULTI_n_PART 2
270 unsigned char *multi_data;
271 unsigned int multi_len;
272 unsigned int multi_pos;
274 atomic_t stats[SSIF_NUM_STATS];
277 #define ssif_inc_stat(ssif, stat) \
278 atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
279 #define ssif_get_stat(ssif, stat) \
280 ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
282 static bool initialized;
284 static atomic_t next_intf = ATOMIC_INIT(0);
286 static void return_hosed_msg(struct ssif_info *ssif_info,
287 struct ipmi_smi_msg *msg);
288 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
289 static int start_send(struct ssif_info *ssif_info,
293 static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
294 unsigned long *flags)
296 spin_lock_irqsave(&ssif_info->lock, *flags);
300 static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
301 unsigned long *flags)
303 spin_unlock_irqrestore(&ssif_info->lock, *flags);
306 static void deliver_recv_msg(struct ssif_info *ssif_info,
307 struct ipmi_smi_msg *msg)
309 ipmi_smi_t intf = ssif_info->intf;
312 ipmi_free_smi_msg(msg);
313 } else if (msg->rsp_size < 0) {
314 return_hosed_msg(ssif_info, msg);
316 "Malformed message in deliver_recv_msg: rsp_size = %d\n",
319 ipmi_smi_msg_received(intf, msg);
323 static void return_hosed_msg(struct ssif_info *ssif_info,
324 struct ipmi_smi_msg *msg)
326 ssif_inc_stat(ssif_info, hosed);
328 /* Make it a response */
329 msg->rsp[0] = msg->data[0] | 4;
330 msg->rsp[1] = msg->data[1];
331 msg->rsp[2] = 0xFF; /* Unknown error. */
334 deliver_recv_msg(ssif_info, msg);
338 * Must be called with the message lock held. This will release the
339 * message lock. Note that the caller will check SSIF_IDLE and start a
340 * new operation, so there is no need to check for new messages to
343 static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags)
345 unsigned char msg[3];
347 ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
348 ssif_info->ssif_state = SSIF_CLEARING_FLAGS;
349 ipmi_ssif_unlock_cond(ssif_info, flags);
351 /* Make sure the watchdog pre-timeout flag is not set at startup. */
352 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
353 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
354 msg[2] = WDT_PRE_TIMEOUT_INT;
356 if (start_send(ssif_info, msg, 3) != 0) {
357 /* Error, just go to normal state. */
358 ssif_info->ssif_state = SSIF_NORMAL;
362 static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags)
366 ssif_info->req_flags = false;
367 ssif_info->ssif_state = SSIF_GETTING_FLAGS;
368 ipmi_ssif_unlock_cond(ssif_info, flags);
370 mb[0] = (IPMI_NETFN_APP_REQUEST << 2);
371 mb[1] = IPMI_GET_MSG_FLAGS_CMD;
372 if (start_send(ssif_info, mb, 2) != 0)
373 ssif_info->ssif_state = SSIF_NORMAL;
376 static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags,
377 struct ipmi_smi_msg *msg)
379 if (start_send(ssif_info, msg->data, msg->data_size) != 0) {
380 unsigned long oflags;
382 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
383 ssif_info->curr_msg = NULL;
384 ssif_info->ssif_state = SSIF_NORMAL;
385 ipmi_ssif_unlock_cond(ssif_info, flags);
386 ipmi_free_smi_msg(msg);
390 static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
392 struct ipmi_smi_msg *msg;
394 ssif_info->req_events = false;
396 msg = ipmi_alloc_smi_msg();
398 ssif_info->ssif_state = SSIF_NORMAL;
402 ssif_info->curr_msg = msg;
403 ssif_info->ssif_state = SSIF_GETTING_EVENTS;
404 ipmi_ssif_unlock_cond(ssif_info, flags);
406 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
407 msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
410 check_start_send(ssif_info, flags, msg);
413 static void start_recv_msg_fetch(struct ssif_info *ssif_info,
414 unsigned long *flags)
416 struct ipmi_smi_msg *msg;
418 msg = ipmi_alloc_smi_msg();
420 ssif_info->ssif_state = SSIF_NORMAL;
424 ssif_info->curr_msg = msg;
425 ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
426 ipmi_ssif_unlock_cond(ssif_info, flags);
428 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
429 msg->data[1] = IPMI_GET_MSG_CMD;
432 check_start_send(ssif_info, flags, msg);
436 * Must be called with the message lock held. This will release the
437 * message lock. Note that the caller will check SSIF_IDLE and start a
438 * new operation, so there is no need to check for new messages to
441 static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
443 if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
444 ipmi_smi_t intf = ssif_info->intf;
445 /* Watchdog pre-timeout */
446 ssif_inc_stat(ssif_info, watchdog_pretimeouts);
447 start_clear_flags(ssif_info, flags);
449 ipmi_smi_watchdog_pretimeout(intf);
450 } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL)
451 /* Messages available. */
452 start_recv_msg_fetch(ssif_info, flags);
453 else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL)
454 /* Events available. */
455 start_event_fetch(ssif_info, flags);
457 ssif_info->ssif_state = SSIF_NORMAL;
458 ipmi_ssif_unlock_cond(ssif_info, flags);
462 static int ipmi_ssif_thread(void *data)
464 struct ssif_info *ssif_info = data;
466 while (!kthread_should_stop()) {
469 /* Wait for something to do */
470 wait_for_completion(&ssif_info->wake_thread);
471 init_completion(&ssif_info->wake_thread);
473 if (ssif_info->stopping)
476 if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
477 result = i2c_smbus_write_block_data(
478 ssif_info->client, SSIF_IPMI_REQUEST,
479 ssif_info->i2c_data[0],
480 ssif_info->i2c_data + 1);
481 ssif_info->done_handler(ssif_info, result, NULL, 0);
483 result = i2c_smbus_read_block_data(
484 ssif_info->client, SSIF_IPMI_RESPONSE,
485 ssif_info->i2c_data);
487 ssif_info->done_handler(ssif_info, result,
490 ssif_info->done_handler(ssif_info, 0,
499 static int ssif_i2c_send(struct ssif_info *ssif_info,
500 ssif_i2c_done handler,
501 int read_write, int command,
502 unsigned char *data, unsigned int size)
504 ssif_info->done_handler = handler;
506 ssif_info->i2c_read_write = read_write;
507 ssif_info->i2c_command = command;
508 ssif_info->i2c_data = data;
509 ssif_info->i2c_size = size;
510 complete(&ssif_info->wake_thread);
515 static void msg_done_handler(struct ssif_info *ssif_info, int result,
516 unsigned char *data, unsigned int len);
518 static void retry_timeout(unsigned long data)
520 struct ssif_info *ssif_info = (void *) data;
523 if (ssif_info->stopping)
526 ssif_info->rtc_us_timer = 0;
528 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
530 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
532 /* request failed, just return the error. */
533 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
534 pr_info("Error from i2c_non_blocking_op(5)\n");
536 msg_done_handler(ssif_info, -EIO, NULL, 0);
540 static int start_resend(struct ssif_info *ssif_info);
542 static void msg_done_handler(struct ssif_info *ssif_info, int result,
543 unsigned char *data, unsigned int len)
545 struct ipmi_smi_msg *msg;
546 unsigned long oflags, *flags;
550 * We are single-threaded here, so no need for a lock until we
551 * start messing with driver states or the queues.
555 ssif_info->retries_left--;
556 if (ssif_info->retries_left > 0) {
557 ssif_inc_stat(ssif_info, receive_retries);
559 mod_timer(&ssif_info->retry_timer,
560 jiffies + SSIF_MSG_JIFFIES);
561 ssif_info->rtc_us_timer = SSIF_MSG_USEC;
565 ssif_inc_stat(ssif_info, receive_errors);
567 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
568 pr_info("Error in msg_done_handler: %d\n", result);
573 if ((len > 1) && (ssif_info->multi_pos == 0)
574 && (data[0] == 0x00) && (data[1] == 0x01)) {
575 /* Start of multi-part read. Start the next transaction. */
578 ssif_inc_stat(ssif_info, received_message_parts);
580 /* Remove the multi-part read marker. */
581 for (i = 0; i < (len-2); i++)
582 ssif_info->data[i] = data[i+2];
584 ssif_info->multi_len = len;
585 ssif_info->multi_pos = 1;
587 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
588 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
589 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
591 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
592 pr_info("Error from i2c_non_blocking_op(1)\n");
597 } else if (ssif_info->multi_pos) {
598 /* Middle of multi-part read. Start the next transaction. */
600 unsigned char blocknum;
604 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
605 pr_info(PFX "Middle message with no data\n");
610 blocknum = data[ssif_info->multi_len];
612 if (ssif_info->multi_len+len-1 > IPMI_MAX_MSG_LENGTH) {
613 /* Received message too big, abort the operation. */
615 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
616 pr_info("Received message too big\n");
621 /* Remove the blocknum from the data. */
622 for (i = 0; i < (len-1); i++)
623 ssif_info->data[i+ssif_info->multi_len] = data[i+1];
625 ssif_info->multi_len += len;
626 if (blocknum == 0xff) {
628 len = ssif_info->multi_len;
629 data = ssif_info->data;
630 } else if ((blocknum+1) != ssif_info->multi_pos) {
632 * Out of sequence block, just abort. Block
633 * numbers start at zero for the second block,
634 * but multi_pos starts at one, so the +1.
638 ssif_inc_stat(ssif_info, received_message_parts);
640 ssif_info->multi_pos++;
642 rv = ssif_i2c_send(ssif_info, msg_done_handler,
644 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
646 I2C_SMBUS_BLOCK_DATA);
648 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
650 "Error from i2c_non_blocking_op(2)\n");
659 ssif_inc_stat(ssif_info, receive_errors);
661 ssif_inc_stat(ssif_info, received_messages);
662 ssif_inc_stat(ssif_info, received_message_parts);
667 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
668 pr_info(PFX "DONE 1: state = %d, result=%d.\n",
669 ssif_info->ssif_state, result);
671 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
672 msg = ssif_info->curr_msg;
675 if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
676 msg->rsp_size = IPMI_MAX_MSG_LENGTH;
677 memcpy(msg->rsp, data, msg->rsp_size);
678 ssif_info->curr_msg = NULL;
681 switch (ssif_info->ssif_state) {
683 ipmi_ssif_unlock_cond(ssif_info, flags);
688 return_hosed_msg(ssif_info, msg);
690 deliver_recv_msg(ssif_info, msg);
693 case SSIF_GETTING_FLAGS:
694 /* We got the flags from the SSIF, now handle them. */
695 if ((result < 0) || (len < 4) || (data[2] != 0)) {
697 * Error fetching flags, or invalid length,
698 * just give up for now.
700 ssif_info->ssif_state = SSIF_NORMAL;
701 ipmi_ssif_unlock_cond(ssif_info, flags);
702 pr_warn(PFX "Error getting flags: %d %d, %x\n",
703 result, len, data[2]);
704 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
705 || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
706 pr_warn(PFX "Invalid response getting flags: %x %x\n",
709 ssif_inc_stat(ssif_info, flag_fetches);
710 ssif_info->msg_flags = data[3];
711 handle_flags(ssif_info, flags);
715 case SSIF_CLEARING_FLAGS:
716 /* We cleared the flags. */
717 if ((result < 0) || (len < 3) || (data[2] != 0)) {
718 /* Error clearing flags */
719 pr_warn(PFX "Error clearing flags: %d %d, %x\n",
720 result, len, data[2]);
721 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
722 || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
723 pr_warn(PFX "Invalid response clearing flags: %x %x\n",
726 ssif_info->ssif_state = SSIF_NORMAL;
727 ipmi_ssif_unlock_cond(ssif_info, flags);
730 case SSIF_GETTING_EVENTS:
731 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
732 /* Error getting event, probably done. */
735 /* Take off the event flag. */
736 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
737 handle_flags(ssif_info, flags);
738 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
739 || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
740 pr_warn(PFX "Invalid response getting events: %x %x\n",
741 msg->rsp[0], msg->rsp[1]);
743 /* Take off the event flag. */
744 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
745 handle_flags(ssif_info, flags);
747 handle_flags(ssif_info, flags);
748 ssif_inc_stat(ssif_info, events);
749 deliver_recv_msg(ssif_info, msg);
753 case SSIF_GETTING_MESSAGES:
754 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
755 /* Error getting event, probably done. */
758 /* Take off the msg flag. */
759 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
760 handle_flags(ssif_info, flags);
761 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
762 || msg->rsp[1] != IPMI_GET_MSG_CMD) {
763 pr_warn(PFX "Invalid response clearing flags: %x %x\n",
764 msg->rsp[0], msg->rsp[1]);
767 /* Take off the msg flag. */
768 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
769 handle_flags(ssif_info, flags);
771 ssif_inc_stat(ssif_info, incoming_messages);
772 handle_flags(ssif_info, flags);
773 deliver_recv_msg(ssif_info, msg);
778 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
779 if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
780 if (ssif_info->req_events)
781 start_event_fetch(ssif_info, flags);
782 else if (ssif_info->req_flags)
783 start_flag_fetch(ssif_info, flags);
785 start_next_msg(ssif_info, flags);
787 ipmi_ssif_unlock_cond(ssif_info, flags);
789 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
790 pr_info(PFX "DONE 2: state = %d.\n", ssif_info->ssif_state);
793 static void msg_written_handler(struct ssif_info *ssif_info, int result,
794 unsigned char *data, unsigned int len)
798 /* We are single-threaded here, so no need for a lock. */
800 ssif_info->retries_left--;
801 if (ssif_info->retries_left > 0) {
802 if (!start_resend(ssif_info)) {
803 ssif_inc_stat(ssif_info, send_retries);
806 /* request failed, just return the error. */
807 ssif_inc_stat(ssif_info, send_errors);
809 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
811 "Out of retries in msg_written_handler\n");
812 msg_done_handler(ssif_info, -EIO, NULL, 0);
816 ssif_inc_stat(ssif_info, send_errors);
819 * Got an error on transmit, let the done routine
822 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
823 pr_info("Error in msg_written_handler: %d\n", result);
825 msg_done_handler(ssif_info, result, NULL, 0);
829 if (ssif_info->multi_data) {
830 /* In the middle of a multi-data write. */
833 ssif_inc_stat(ssif_info, sent_messages_parts);
835 left = ssif_info->multi_len - ssif_info->multi_pos;
839 ssif_info->multi_data[ssif_info->multi_pos] = left;
840 ssif_info->multi_pos += left;
843 * Write is finished. Note that we must end
844 * with a write of less than 32 bytes to
845 * complete the transaction, even if it is
848 ssif_info->multi_data = NULL;
850 rv = ssif_i2c_send(ssif_info, msg_written_handler,
852 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
853 ssif_info->multi_data + ssif_info->multi_pos,
854 I2C_SMBUS_BLOCK_DATA);
856 /* request failed, just return the error. */
857 ssif_inc_stat(ssif_info, send_errors);
859 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
860 pr_info("Error from i2c_non_blocking_op(3)\n");
861 msg_done_handler(ssif_info, -EIO, NULL, 0);
864 ssif_inc_stat(ssif_info, sent_messages);
865 ssif_inc_stat(ssif_info, sent_messages_parts);
867 /* Wait a jiffie then request the next message */
868 ssif_info->retries_left = SSIF_RECV_RETRIES;
869 ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
870 mod_timer(&ssif_info->retry_timer,
871 jiffies + SSIF_MSG_PART_JIFFIES);
876 static int start_resend(struct ssif_info *ssif_info)
881 if (ssif_info->data_len > 32) {
882 command = SSIF_IPMI_MULTI_PART_REQUEST_START;
883 ssif_info->multi_data = ssif_info->data;
884 ssif_info->multi_len = ssif_info->data_len;
886 * Subtle thing, this is 32, not 33, because we will
887 * overwrite the thing at position 32 (which was just
888 * transmitted) with the new length.
890 ssif_info->multi_pos = 32;
891 ssif_info->data[0] = 32;
893 ssif_info->multi_data = NULL;
894 command = SSIF_IPMI_REQUEST;
895 ssif_info->data[0] = ssif_info->data_len;
898 rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
899 command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
900 if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
901 pr_info("Error from i2c_non_blocking_op(4)\n");
905 static int start_send(struct ssif_info *ssif_info,
909 if (len > IPMI_MAX_MSG_LENGTH)
911 if (len > ssif_info->max_xmit_msg_size)
914 ssif_info->retries_left = SSIF_SEND_RETRIES;
915 memcpy(ssif_info->data+1, data, len);
916 ssif_info->data_len = len;
917 return start_resend(ssif_info);
920 /* Must be called with the message lock held. */
921 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
923 struct ipmi_smi_msg *msg;
924 unsigned long oflags;
927 if (!SSIF_IDLE(ssif_info)) {
928 ipmi_ssif_unlock_cond(ssif_info, flags);
932 if (!ssif_info->waiting_msg) {
933 ssif_info->curr_msg = NULL;
934 ipmi_ssif_unlock_cond(ssif_info, flags);
938 ssif_info->curr_msg = ssif_info->waiting_msg;
939 ssif_info->waiting_msg = NULL;
940 ipmi_ssif_unlock_cond(ssif_info, flags);
941 rv = start_send(ssif_info,
942 ssif_info->curr_msg->data,
943 ssif_info->curr_msg->data_size);
945 msg = ssif_info->curr_msg;
946 ssif_info->curr_msg = NULL;
947 return_hosed_msg(ssif_info, msg);
948 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
954 static void sender(void *send_info,
955 struct ipmi_smi_msg *msg)
957 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
958 unsigned long oflags, *flags;
960 BUG_ON(ssif_info->waiting_msg);
961 ssif_info->waiting_msg = msg;
963 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
964 start_next_msg(ssif_info, flags);
966 if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
970 pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n",
971 msg->data[0], msg->data[1], t.tv_sec, t.tv_usec);
975 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
977 struct ssif_info *ssif_info = send_info;
979 data->addr_src = ssif_info->addr_source;
980 data->dev = &ssif_info->client->dev;
981 data->addr_info = ssif_info->addr_info;
982 get_device(data->dev);
988 * Instead of having our own timer to periodically check the message
989 * flags, we let the message handler drive us.
991 static void request_events(void *send_info)
993 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
994 unsigned long oflags, *flags;
996 if (!ssif_info->has_event_buffer)
999 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1001 * Request flags first, not events, because the lower layer
1002 * doesn't have a way to send an attention. But make sure
1003 * event checking still happens.
1005 ssif_info->req_events = true;
1006 if (SSIF_IDLE(ssif_info))
1007 start_flag_fetch(ssif_info, flags);
1009 ssif_info->req_flags = true;
1010 ipmi_ssif_unlock_cond(ssif_info, flags);
1014 static int inc_usecount(void *send_info)
1016 struct ssif_info *ssif_info = send_info;
1018 if (!i2c_get_adapter(ssif_info->client->adapter->nr))
1021 i2c_use_client(ssif_info->client);
1025 static void dec_usecount(void *send_info)
1027 struct ssif_info *ssif_info = send_info;
1029 i2c_release_client(ssif_info->client);
1030 i2c_put_adapter(ssif_info->client->adapter);
1033 static int ssif_start_processing(void *send_info,
1036 struct ssif_info *ssif_info = send_info;
1038 ssif_info->intf = intf;
1043 #define MAX_SSIF_BMCS 4
1045 static unsigned short addr[MAX_SSIF_BMCS];
1046 static int num_addrs;
1047 module_param_array(addr, ushort, &num_addrs, 0);
1048 MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
1050 static char *adapter_name[MAX_SSIF_BMCS];
1051 static int num_adapter_names;
1052 module_param_array(adapter_name, charp, &num_adapter_names, 0);
1053 MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
1055 static int slave_addrs[MAX_SSIF_BMCS];
1056 static int num_slave_addrs;
1057 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1058 MODULE_PARM_DESC(slave_addrs,
1059 "The default IPMB slave address for the controller.");
1062 * Bit 0 enables message debugging, bit 1 enables state debugging, and
1063 * bit 2 enables timing debugging. This is an array indexed by
1066 static int dbg[MAX_SSIF_BMCS];
1068 module_param_array(dbg, int, &num_dbg, 0);
1069 MODULE_PARM_DESC(dbg, "Turn on debugging.");
1071 static bool ssif_dbg_probe;
1072 module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
1073 MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
1075 static int use_thread;
1076 module_param(use_thread, int, 0);
1077 MODULE_PARM_DESC(use_thread, "Use the thread interface.");
1079 static bool ssif_tryacpi = 1;
1080 module_param_named(tryacpi, ssif_tryacpi, bool, 0);
1081 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1083 static bool ssif_trydmi = 1;
1084 module_param_named(trydmi, ssif_trydmi, bool, 0);
1085 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1087 static DEFINE_MUTEX(ssif_infos_mutex);
1088 static LIST_HEAD(ssif_infos);
1090 static int ssif_remove(struct i2c_client *client)
1092 struct ssif_info *ssif_info = i2c_get_clientdata(client);
1098 i2c_set_clientdata(client, NULL);
1101 * After this point, we won't deliver anything asychronously
1102 * to the message handler. We can unregister ourself.
1104 rv = ipmi_unregister_smi(ssif_info->intf);
1106 pr_err(PFX "Unable to unregister device: errno=%d\n", rv);
1109 ssif_info->intf = NULL;
1111 /* make sure the driver is not looking for flags any more. */
1112 while (ssif_info->ssif_state != SSIF_NORMAL)
1113 schedule_timeout(1);
1115 ssif_info->stopping = true;
1116 del_timer_sync(&ssif_info->retry_timer);
1117 if (ssif_info->thread) {
1118 complete(&ssif_info->wake_thread);
1119 kthread_stop(ssif_info->thread);
1123 * No message can be outstanding now, we have removed the
1124 * upper layer and it permitted us to do so.
1130 static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
1131 int *resp_len, unsigned char *resp)
1136 retry_cnt = SSIF_SEND_RETRIES;
1138 ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
1147 retry_cnt = SSIF_RECV_RETRIES;
1148 while (retry_cnt > 0) {
1149 ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
1153 msleep(SSIF_MSG_MSEC);
1160 /* Validate that the response is correct. */
1162 (resp[0] != (msg[0] | (1 << 2))) ||
1163 (resp[1] != msg[1]))
1174 static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
1176 unsigned char *resp;
1177 unsigned char msg[3];
1181 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1185 /* Do a Get Device ID command, since it is required. */
1186 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1187 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1188 rv = do_cmd(client, 2, msg, &len, resp);
1192 strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
1197 static int smi_type_proc_show(struct seq_file *m, void *v)
1199 return seq_puts(m, "ssif\n");
1202 static int smi_type_proc_open(struct inode *inode, struct file *file)
1204 return single_open(file, smi_type_proc_show, inode->i_private);
1207 static const struct file_operations smi_type_proc_ops = {
1208 .open = smi_type_proc_open,
1210 .llseek = seq_lseek,
1211 .release = single_release,
1214 static int smi_stats_proc_show(struct seq_file *m, void *v)
1216 struct ssif_info *ssif_info = m->private;
1218 seq_printf(m, "sent_messages: %u\n",
1219 ssif_get_stat(ssif_info, sent_messages));
1220 seq_printf(m, "sent_messages_parts: %u\n",
1221 ssif_get_stat(ssif_info, sent_messages_parts));
1222 seq_printf(m, "send_retries: %u\n",
1223 ssif_get_stat(ssif_info, send_retries));
1224 seq_printf(m, "send_errors: %u\n",
1225 ssif_get_stat(ssif_info, send_errors));
1226 seq_printf(m, "received_messages: %u\n",
1227 ssif_get_stat(ssif_info, received_messages));
1228 seq_printf(m, "received_message_parts: %u\n",
1229 ssif_get_stat(ssif_info, received_message_parts));
1230 seq_printf(m, "receive_retries: %u\n",
1231 ssif_get_stat(ssif_info, receive_retries));
1232 seq_printf(m, "receive_errors: %u\n",
1233 ssif_get_stat(ssif_info, receive_errors));
1234 seq_printf(m, "flag_fetches: %u\n",
1235 ssif_get_stat(ssif_info, flag_fetches));
1236 seq_printf(m, "hosed: %u\n",
1237 ssif_get_stat(ssif_info, hosed));
1238 seq_printf(m, "events: %u\n",
1239 ssif_get_stat(ssif_info, events));
1240 seq_printf(m, "watchdog_pretimeouts: %u\n",
1241 ssif_get_stat(ssif_info, watchdog_pretimeouts));
1245 static int smi_stats_proc_open(struct inode *inode, struct file *file)
1247 return single_open(file, smi_stats_proc_show, PDE_DATA(inode));
1250 static const struct file_operations smi_stats_proc_ops = {
1251 .open = smi_stats_proc_open,
1253 .llseek = seq_lseek,
1254 .release = single_release,
1257 static struct ssif_addr_info *ssif_info_find(unsigned short addr,
1259 bool match_null_name)
1261 struct ssif_addr_info *info, *found = NULL;
1264 list_for_each_entry(info, &ssif_infos, link) {
1265 if (info->binfo.addr == addr) {
1266 if (info->adapter_name || adapter_name) {
1267 if (!info->adapter_name != !adapter_name) {
1268 /* One is NULL and one is not */
1271 if (strcmp(info->adapter_name, adapter_name))
1272 /* Names to not match */
1280 if (!found && match_null_name) {
1281 /* Try to get an exact match first, then try with a NULL name */
1282 adapter_name = NULL;
1283 match_null_name = false;
1290 static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
1293 acpi_handle acpi_handle;
1295 acpi_handle = ACPI_HANDLE(dev);
1297 ssif_info->addr_source = SI_ACPI;
1298 ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
1305 static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
1307 unsigned char msg[3];
1308 unsigned char *resp;
1309 struct ssif_info *ssif_info;
1314 struct ssif_addr_info *addr_info = NULL;
1317 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1321 ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
1327 if (!check_acpi(ssif_info, &client->dev)) {
1328 addr_info = ssif_info_find(client->addr, client->adapter->name,
1331 /* Must have come in through sysfs. */
1332 ssif_info->addr_source = SI_HOTMOD;
1334 ssif_info->addr_source = addr_info->addr_src;
1335 ssif_info->ssif_debug = addr_info->debug;
1336 ssif_info->addr_info = addr_info->addr_info;
1337 slave_addr = addr_info->slave_addr;
1341 pr_info(PFX "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1342 ipmi_addr_src_to_str(ssif_info->addr_source),
1343 client->addr, client->adapter->name, slave_addr);
1346 * Do a Get Device ID command, since it comes back with some
1349 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1350 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1351 rv = do_cmd(client, 2, msg, &len, resp);
1355 rv = ipmi_demangle_device_id(resp, len, &ssif_info->device_id);
1359 ssif_info->client = client;
1360 i2c_set_clientdata(client, ssif_info);
1362 /* Now check for system interface capabilities */
1363 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1364 msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
1365 msg[2] = 0; /* SSIF */
1366 rv = do_cmd(client, 3, msg, &len, resp);
1367 if (!rv && (len >= 3) && (resp[2] == 0)) {
1370 pr_info(PFX "SSIF info too short: %d\n", len);
1374 /* Got a good SSIF response, handle it. */
1375 ssif_info->max_xmit_msg_size = resp[5];
1376 ssif_info->max_recv_msg_size = resp[6];
1377 ssif_info->multi_support = (resp[4] >> 6) & 0x3;
1378 ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
1380 /* Sanitize the data */
1381 switch (ssif_info->multi_support) {
1383 if (ssif_info->max_xmit_msg_size > 32)
1384 ssif_info->max_xmit_msg_size = 32;
1385 if (ssif_info->max_recv_msg_size > 32)
1386 ssif_info->max_recv_msg_size = 32;
1389 case SSIF_MULTI_2_PART:
1390 if (ssif_info->max_xmit_msg_size > 64)
1391 ssif_info->max_xmit_msg_size = 64;
1392 if (ssif_info->max_recv_msg_size > 62)
1393 ssif_info->max_recv_msg_size = 62;
1396 case SSIF_MULTI_n_PART:
1400 /* Data is not sane, just give up. */
1405 /* Assume no multi-part or PEC support */
1406 pr_info(PFX "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1409 ssif_info->max_xmit_msg_size = 32;
1410 ssif_info->max_recv_msg_size = 32;
1411 ssif_info->multi_support = SSIF_NO_MULTI;
1412 ssif_info->supports_pec = 0;
1415 /* Make sure the NMI timeout is cleared. */
1416 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1417 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
1418 msg[2] = WDT_PRE_TIMEOUT_INT;
1419 rv = do_cmd(client, 3, msg, &len, resp);
1420 if (rv || (len < 3) || (resp[2] != 0))
1421 pr_warn(PFX "Unable to clear message flags: %d %d %2.2x\n",
1424 /* Attempt to enable the event buffer. */
1425 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1426 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1427 rv = do_cmd(client, 2, msg, &len, resp);
1428 if (rv || (len < 4) || (resp[2] != 0)) {
1429 pr_warn(PFX "Error getting global enables: %d %d %2.2x\n",
1431 rv = 0; /* Not fatal */
1435 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1436 ssif_info->has_event_buffer = true;
1437 /* buffer is already enabled, nothing to do. */
1441 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1442 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1443 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
1444 rv = do_cmd(client, 3, msg, &len, resp);
1445 if (rv || (len < 2)) {
1446 pr_warn(PFX "Error getting global enables: %d %d %2.2x\n",
1448 rv = 0; /* Not fatal */
1453 /* A successful return means the event buffer is supported. */
1454 ssif_info->has_event_buffer = true;
1457 ssif_info->intf_num = atomic_inc_return(&next_intf);
1459 if (ssif_dbg_probe) {
1460 pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
1464 spin_lock_init(&ssif_info->lock);
1465 ssif_info->ssif_state = SSIF_NORMAL;
1466 init_timer(&ssif_info->retry_timer);
1467 ssif_info->retry_timer.data = (unsigned long) ssif_info;
1468 ssif_info->retry_timer.function = retry_timeout;
1470 for (i = 0; i < SSIF_NUM_STATS; i++)
1471 atomic_set(&ssif_info->stats[i], 0);
1473 if (ssif_info->supports_pec)
1474 ssif_info->client->flags |= I2C_CLIENT_PEC;
1476 ssif_info->handlers.owner = THIS_MODULE;
1477 ssif_info->handlers.start_processing = ssif_start_processing;
1478 ssif_info->handlers.get_smi_info = get_smi_info;
1479 ssif_info->handlers.sender = sender;
1480 ssif_info->handlers.request_events = request_events;
1481 ssif_info->handlers.inc_usecount = inc_usecount;
1482 ssif_info->handlers.dec_usecount = dec_usecount;
1485 unsigned int thread_num;
1487 thread_num = ((ssif_info->client->adapter->nr << 8) |
1488 ssif_info->client->addr);
1489 init_completion(&ssif_info->wake_thread);
1490 ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
1491 "kssif%4.4x", thread_num);
1492 if (IS_ERR(ssif_info->thread)) {
1493 rv = PTR_ERR(ssif_info->thread);
1494 dev_notice(&ssif_info->client->dev,
1495 "Could not start kernel thread: error %d\n",
1501 rv = ipmi_register_smi(&ssif_info->handlers,
1503 &ssif_info->device_id,
1504 &ssif_info->client->dev,
1507 pr_err(PFX "Unable to register device: error %d\n", rv);
1511 rv = ipmi_smi_add_proc_entry(ssif_info->intf, "type",
1515 pr_err(PFX "Unable to create proc entry: %d\n", rv);
1519 rv = ipmi_smi_add_proc_entry(ssif_info->intf, "ssif_stats",
1520 &smi_stats_proc_ops,
1523 pr_err(PFX "Unable to create proc entry: %d\n", rv);
1534 ipmi_unregister_smi(ssif_info->intf);
1538 static int ssif_adapter_handler(struct device *adev, void *opaque)
1540 struct ssif_addr_info *addr_info = opaque;
1542 if (adev->type != &i2c_adapter_type)
1545 i2c_new_device(to_i2c_adapter(adev), &addr_info->binfo);
1547 if (!addr_info->adapter_name)
1548 return 1; /* Only try the first I2C adapter by default. */
1552 static int new_ssif_client(int addr, char *adapter_name,
1553 int debug, int slave_addr,
1554 enum ipmi_addr_src addr_src)
1556 struct ssif_addr_info *addr_info;
1559 mutex_lock(&ssif_infos_mutex);
1560 if (ssif_info_find(addr, adapter_name, false)) {
1565 addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
1572 addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
1573 if (!addr_info->adapter_name) {
1580 strncpy(addr_info->binfo.type, DEVICE_NAME,
1581 sizeof(addr_info->binfo.type));
1582 addr_info->binfo.addr = addr;
1583 addr_info->binfo.platform_data = addr_info;
1584 addr_info->debug = debug;
1585 addr_info->slave_addr = slave_addr;
1586 addr_info->addr_src = addr_src;
1588 list_add_tail(&addr_info->link, &ssif_infos);
1591 i2c_for_each_dev(addr_info, ssif_adapter_handler);
1592 /* Otherwise address list will get it */
1595 mutex_unlock(&ssif_infos_mutex);
1599 static void free_ssif_clients(void)
1601 struct ssif_addr_info *info, *tmp;
1603 mutex_lock(&ssif_infos_mutex);
1604 list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
1605 list_del(&info->link);
1606 kfree(info->adapter_name);
1609 mutex_unlock(&ssif_infos_mutex);
1612 static unsigned short *ssif_address_list(void)
1614 struct ssif_addr_info *info;
1615 unsigned int count = 0, i;
1616 unsigned short *address_list;
1618 list_for_each_entry(info, &ssif_infos, link)
1621 address_list = kzalloc(sizeof(*address_list) * (count + 1), GFP_KERNEL);
1626 list_for_each_entry(info, &ssif_infos, link) {
1627 unsigned short addr = info->binfo.addr;
1630 for (j = 0; j < i; j++) {
1631 if (address_list[j] == addr)
1634 address_list[i] = addr;
1638 address_list[i] = I2C_CLIENT_END;
1640 return address_list;
1644 static struct acpi_device_id ssif_acpi_match[] = {
1648 MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
1651 * Once we get an ACPI failure, we don't try any more, because we go
1652 * through the tables sequentially. Once we don't find a table, there
1655 static int acpi_failure;
1658 * Defined in the IPMI 2.0 spec.
1669 s8 CreatorRevision[4];
1672 s16 SpecificationRevision;
1675 * Bit 0 - SCI interrupt supported
1676 * Bit 1 - I/O APIC/SAPIC
1681 * If bit 0 of InterruptType is set, then this is the SCI
1682 * interrupt in the GPEx_STS register.
1689 * If bit 1 of InterruptType is set, then this is the I/O
1690 * APIC/SAPIC interrupt.
1692 u32 GlobalSystemInterrupt;
1694 /* The actual register address. */
1695 struct acpi_generic_address addr;
1699 s8 spmi_id[1]; /* A '\0' terminated array starts here. */
1702 static int try_init_spmi(struct SPMITable *spmi)
1704 unsigned short myaddr;
1706 if (num_addrs >= MAX_SSIF_BMCS)
1709 if (spmi->IPMIlegacy != 1) {
1710 pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi->IPMIlegacy);
1714 if (spmi->InterfaceType != 4)
1717 if (spmi->addr.space_id != ACPI_ADR_SPACE_SMBUS) {
1718 pr_warn(PFX "Invalid ACPI SSIF I/O Address type: %d\n",
1719 spmi->addr.space_id);
1723 myaddr = spmi->addr.address >> 1;
1725 return new_ssif_client(myaddr, NULL, 0, 0, SI_SPMI);
1728 static void spmi_find_bmc(void)
1731 struct SPMITable *spmi;
1740 for (i = 0; ; i++) {
1741 status = acpi_get_table(ACPI_SIG_SPMI, i+1,
1742 (struct acpi_table_header **)&spmi);
1743 if (status != AE_OK)
1746 try_init_spmi(spmi);
1750 static void spmi_find_bmc(void) { }
1754 static int decode_dmi(const struct dmi_device *dmi_dev)
1756 struct dmi_header *dm = dmi_dev->device_data;
1757 u8 *data = (u8 *) dm;
1758 u8 len = dm->length;
1759 unsigned short myaddr;
1762 if (num_addrs >= MAX_SSIF_BMCS)
1768 if (data[0x04] != 4) /* Not SSIF */
1771 if ((data[8] >> 1) == 0) {
1773 * Some broken systems put the I2C address in
1774 * the slave address field. We try to
1775 * accommodate them here.
1777 myaddr = data[6] >> 1;
1780 myaddr = data[8] >> 1;
1781 slave_addr = data[6];
1784 return new_ssif_client(myaddr, NULL, 0, 0, SI_SMBIOS);
1787 static void dmi_iterator(void)
1789 const struct dmi_device *dev = NULL;
1791 while ((dev = dmi_find_device(DMI_DEV_TYPE_IPMI, NULL, dev)))
1795 static void dmi_iterator(void) { }
1798 static const struct i2c_device_id ssif_id[] = {
1802 MODULE_DEVICE_TABLE(i2c, ssif_id);
1804 static struct i2c_driver ssif_i2c_driver = {
1805 .class = I2C_CLASS_HWMON,
1807 .owner = THIS_MODULE,
1810 .probe = ssif_probe,
1811 .remove = ssif_remove,
1812 .id_table = ssif_id,
1813 .detect = ssif_detect
1816 static int init_ipmi_ssif(void)
1824 pr_info("IPMI SSIF Interface driver\n");
1826 /* build list for i2c from addr list */
1827 for (i = 0; i < num_addrs; i++) {
1828 rv = new_ssif_client(addr[i], adapter_name[i],
1829 dbg[i], slave_addrs[i],
1833 "Couldn't add hardcoded device at addr 0x%x\n",
1838 ssif_i2c_driver.driver.acpi_match_table =
1839 ACPI_PTR(ssif_acpi_match);
1845 ssif_i2c_driver.address_list = ssif_address_list();
1847 rv = i2c_add_driver(&ssif_i2c_driver);
1853 module_init(init_ipmi_ssif);
1855 static void cleanup_ipmi_ssif(void)
1860 initialized = false;
1862 i2c_del_driver(&ssif_i2c_driver);
1864 free_ssif_clients();
1866 module_exit(cleanup_ipmi_ssif);
1868 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
1869 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
1870 MODULE_LICENSE("GPL");