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>
55 #include <linux/ctype.h>
57 #define PFX "ipmi_ssif: "
58 #define DEVICE_NAME "ipmi_ssif"
60 #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
62 #define SSIF_IPMI_REQUEST 2
63 #define SSIF_IPMI_MULTI_PART_REQUEST_START 6
64 #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
65 #define SSIF_IPMI_RESPONSE 3
66 #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
68 /* ssif_debug is a bit-field
69 * SSIF_DEBUG_MSG - commands and their responses
70 * SSIF_DEBUG_STATES - message states
71 * SSIF_DEBUG_TIMING - Measure times between events in the driver
73 #define SSIF_DEBUG_TIMING 4
74 #define SSIF_DEBUG_STATE 2
75 #define SSIF_DEBUG_MSG 1
76 #define SSIF_NODEBUG 0
77 #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
82 #define SSIF_MSG_USEC 20000 /* 20ms between message tries. */
83 #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
85 /* How many times to we retry sending/receiving the message. */
86 #define SSIF_SEND_RETRIES 5
87 #define SSIF_RECV_RETRIES 250
89 #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
90 #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
91 #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
93 enum ssif_intf_state
{
98 SSIF_GETTING_MESSAGES
,
99 /* FIXME - add watchdog stuff. */
102 #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \
103 && (ssif)->curr_msg == NULL)
106 * Indexes into stats[] in ssif_info below.
108 enum ssif_stat_indexes
{
109 /* Number of total messages sent. */
110 SSIF_STAT_sent_messages
= 0,
113 * Number of message parts sent. Messages may be broken into
114 * parts if they are long.
116 SSIF_STAT_sent_messages_parts
,
119 * Number of time a message was retried.
121 SSIF_STAT_send_retries
,
124 * Number of times the send of a message failed.
126 SSIF_STAT_send_errors
,
129 * Number of message responses received.
131 SSIF_STAT_received_messages
,
134 * Number of message fragments received.
136 SSIF_STAT_received_message_parts
,
139 * Number of times the receive of a message was retried.
141 SSIF_STAT_receive_retries
,
144 * Number of errors receiving messages.
146 SSIF_STAT_receive_errors
,
149 * Number of times a flag fetch was requested.
151 SSIF_STAT_flag_fetches
,
154 * Number of times the hardware didn't follow the state machine.
159 * Number of received events.
163 /* Number of asyncronous messages received. */
164 SSIF_STAT_incoming_messages
,
166 /* Number of watchdog pretimeouts. */
167 SSIF_STAT_watchdog_pretimeouts
,
169 /* Always add statistics before this value, it must be last. */
173 struct ssif_addr_info
{
175 struct i2c_board_info binfo
;
179 enum ipmi_addr_src addr_src
;
180 union ipmi_smi_info_union addr_info
;
182 struct mutex clients_mutex
;
183 struct list_head clients
;
185 struct list_head link
;
190 typedef void (*ssif_i2c_done
)(struct ssif_info
*ssif_info
, int result
,
191 unsigned char *data
, unsigned int len
);
197 struct ipmi_smi_msg
*waiting_msg
;
198 struct ipmi_smi_msg
*curr_msg
;
199 enum ssif_intf_state ssif_state
;
200 unsigned long ssif_debug
;
202 struct ipmi_smi_handlers handlers
;
204 enum ipmi_addr_src addr_source
; /* ACPI, PCI, SMBIOS, hardcode, etc. */
205 union ipmi_smi_info_union addr_info
;
208 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
209 * is set to hold the flags until we are done handling everything
212 #define RECEIVE_MSG_AVAIL 0x01
213 #define EVENT_MSG_BUFFER_FULL 0x02
214 #define WDT_PRE_TIMEOUT_INT 0x08
215 unsigned char msg_flags
;
217 bool has_event_buffer
;
220 * If set to true, this will request events the next time the
221 * state machine is idle.
226 * If set to true, this will request flags the next time the
227 * state machine is idle.
232 * Used to perform timer operations when run-to-completion
233 * mode is on. This is a countdown timer.
237 /* Used for sending/receiving data. +1 for the length. */
238 unsigned char data
[IPMI_MAX_MSG_LENGTH
+ 1];
239 unsigned int data_len
;
241 /* Temp receive buffer, gets copied into data. */
242 unsigned char recv
[I2C_SMBUS_BLOCK_MAX
];
244 struct i2c_client
*client
;
245 ssif_i2c_done done_handler
;
247 /* Thread interface handling */
248 struct task_struct
*thread
;
249 struct completion wake_thread
;
253 unsigned char *i2c_data
;
254 unsigned int i2c_size
;
256 /* From the device id response. */
257 struct ipmi_device_id device_id
;
259 struct timer_list retry_timer
;
262 /* Info from SSIF cmd */
263 unsigned char max_xmit_msg_size
;
264 unsigned char max_recv_msg_size
;
265 unsigned int multi_support
;
268 #define SSIF_NO_MULTI 0
269 #define SSIF_MULTI_2_PART 1
270 #define SSIF_MULTI_n_PART 2
271 unsigned char *multi_data
;
272 unsigned int multi_len
;
273 unsigned int multi_pos
;
275 atomic_t stats
[SSIF_NUM_STATS
];
278 #define ssif_inc_stat(ssif, stat) \
279 atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
280 #define ssif_get_stat(ssif, stat) \
281 ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
283 static bool initialized
;
285 static atomic_t next_intf
= ATOMIC_INIT(0);
287 static void return_hosed_msg(struct ssif_info
*ssif_info
,
288 struct ipmi_smi_msg
*msg
);
289 static void start_next_msg(struct ssif_info
*ssif_info
, unsigned long *flags
);
290 static int start_send(struct ssif_info
*ssif_info
,
294 static unsigned long *ipmi_ssif_lock_cond(struct ssif_info
*ssif_info
,
295 unsigned long *flags
)
297 spin_lock_irqsave(&ssif_info
->lock
, *flags
);
301 static void ipmi_ssif_unlock_cond(struct ssif_info
*ssif_info
,
302 unsigned long *flags
)
304 spin_unlock_irqrestore(&ssif_info
->lock
, *flags
);
307 static void deliver_recv_msg(struct ssif_info
*ssif_info
,
308 struct ipmi_smi_msg
*msg
)
310 ipmi_smi_t intf
= ssif_info
->intf
;
313 ipmi_free_smi_msg(msg
);
314 } else if (msg
->rsp_size
< 0) {
315 return_hosed_msg(ssif_info
, msg
);
317 "Malformed message in deliver_recv_msg: rsp_size = %d\n",
320 ipmi_smi_msg_received(intf
, msg
);
324 static void return_hosed_msg(struct ssif_info
*ssif_info
,
325 struct ipmi_smi_msg
*msg
)
327 ssif_inc_stat(ssif_info
, hosed
);
329 /* Make it a response */
330 msg
->rsp
[0] = msg
->data
[0] | 4;
331 msg
->rsp
[1] = msg
->data
[1];
332 msg
->rsp
[2] = 0xFF; /* Unknown error. */
335 deliver_recv_msg(ssif_info
, msg
);
339 * Must be called with the message lock held. This will release the
340 * message lock. Note that the caller will check SSIF_IDLE and start a
341 * new operation, so there is no need to check for new messages to
344 static void start_clear_flags(struct ssif_info
*ssif_info
, unsigned long *flags
)
346 unsigned char msg
[3];
348 ssif_info
->msg_flags
&= ~WDT_PRE_TIMEOUT_INT
;
349 ssif_info
->ssif_state
= SSIF_CLEARING_FLAGS
;
350 ipmi_ssif_unlock_cond(ssif_info
, flags
);
352 /* Make sure the watchdog pre-timeout flag is not set at startup. */
353 msg
[0] = (IPMI_NETFN_APP_REQUEST
<< 2);
354 msg
[1] = IPMI_CLEAR_MSG_FLAGS_CMD
;
355 msg
[2] = WDT_PRE_TIMEOUT_INT
;
357 if (start_send(ssif_info
, msg
, 3) != 0) {
358 /* Error, just go to normal state. */
359 ssif_info
->ssif_state
= SSIF_NORMAL
;
363 static void start_flag_fetch(struct ssif_info
*ssif_info
, unsigned long *flags
)
367 ssif_info
->req_flags
= false;
368 ssif_info
->ssif_state
= SSIF_GETTING_FLAGS
;
369 ipmi_ssif_unlock_cond(ssif_info
, flags
);
371 mb
[0] = (IPMI_NETFN_APP_REQUEST
<< 2);
372 mb
[1] = IPMI_GET_MSG_FLAGS_CMD
;
373 if (start_send(ssif_info
, mb
, 2) != 0)
374 ssif_info
->ssif_state
= SSIF_NORMAL
;
377 static void check_start_send(struct ssif_info
*ssif_info
, unsigned long *flags
,
378 struct ipmi_smi_msg
*msg
)
380 if (start_send(ssif_info
, msg
->data
, msg
->data_size
) != 0) {
381 unsigned long oflags
;
383 flags
= ipmi_ssif_lock_cond(ssif_info
, &oflags
);
384 ssif_info
->curr_msg
= NULL
;
385 ssif_info
->ssif_state
= SSIF_NORMAL
;
386 ipmi_ssif_unlock_cond(ssif_info
, flags
);
387 ipmi_free_smi_msg(msg
);
391 static void start_event_fetch(struct ssif_info
*ssif_info
, unsigned long *flags
)
393 struct ipmi_smi_msg
*msg
;
395 ssif_info
->req_events
= false;
397 msg
= ipmi_alloc_smi_msg();
399 ssif_info
->ssif_state
= SSIF_NORMAL
;
403 ssif_info
->curr_msg
= msg
;
404 ssif_info
->ssif_state
= SSIF_GETTING_EVENTS
;
405 ipmi_ssif_unlock_cond(ssif_info
, flags
);
407 msg
->data
[0] = (IPMI_NETFN_APP_REQUEST
<< 2);
408 msg
->data
[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD
;
411 check_start_send(ssif_info
, flags
, msg
);
414 static void start_recv_msg_fetch(struct ssif_info
*ssif_info
,
415 unsigned long *flags
)
417 struct ipmi_smi_msg
*msg
;
419 msg
= ipmi_alloc_smi_msg();
421 ssif_info
->ssif_state
= SSIF_NORMAL
;
425 ssif_info
->curr_msg
= msg
;
426 ssif_info
->ssif_state
= SSIF_GETTING_MESSAGES
;
427 ipmi_ssif_unlock_cond(ssif_info
, flags
);
429 msg
->data
[0] = (IPMI_NETFN_APP_REQUEST
<< 2);
430 msg
->data
[1] = IPMI_GET_MSG_CMD
;
433 check_start_send(ssif_info
, flags
, msg
);
437 * Must be called with the message lock held. This will release the
438 * message lock. Note that the caller will check SSIF_IDLE and start a
439 * new operation, so there is no need to check for new messages to
442 static void handle_flags(struct ssif_info
*ssif_info
, unsigned long *flags
)
444 if (ssif_info
->msg_flags
& WDT_PRE_TIMEOUT_INT
) {
445 ipmi_smi_t intf
= ssif_info
->intf
;
446 /* Watchdog pre-timeout */
447 ssif_inc_stat(ssif_info
, watchdog_pretimeouts
);
448 start_clear_flags(ssif_info
, flags
);
450 ipmi_smi_watchdog_pretimeout(intf
);
451 } else if (ssif_info
->msg_flags
& RECEIVE_MSG_AVAIL
)
452 /* Messages available. */
453 start_recv_msg_fetch(ssif_info
, flags
);
454 else if (ssif_info
->msg_flags
& EVENT_MSG_BUFFER_FULL
)
455 /* Events available. */
456 start_event_fetch(ssif_info
, flags
);
458 ssif_info
->ssif_state
= SSIF_NORMAL
;
459 ipmi_ssif_unlock_cond(ssif_info
, flags
);
463 static int ipmi_ssif_thread(void *data
)
465 struct ssif_info
*ssif_info
= data
;
467 while (!kthread_should_stop()) {
470 /* Wait for something to do */
471 wait_for_completion(&ssif_info
->wake_thread
);
472 init_completion(&ssif_info
->wake_thread
);
474 if (ssif_info
->stopping
)
477 if (ssif_info
->i2c_read_write
== I2C_SMBUS_WRITE
) {
478 result
= i2c_smbus_write_block_data(
479 ssif_info
->client
, SSIF_IPMI_REQUEST
,
480 ssif_info
->i2c_data
[0],
481 ssif_info
->i2c_data
+ 1);
482 ssif_info
->done_handler(ssif_info
, result
, NULL
, 0);
484 result
= i2c_smbus_read_block_data(
485 ssif_info
->client
, SSIF_IPMI_RESPONSE
,
486 ssif_info
->i2c_data
);
488 ssif_info
->done_handler(ssif_info
, result
,
491 ssif_info
->done_handler(ssif_info
, 0,
500 static int ssif_i2c_send(struct ssif_info
*ssif_info
,
501 ssif_i2c_done handler
,
502 int read_write
, int command
,
503 unsigned char *data
, unsigned int size
)
505 ssif_info
->done_handler
= handler
;
507 ssif_info
->i2c_read_write
= read_write
;
508 ssif_info
->i2c_command
= command
;
509 ssif_info
->i2c_data
= data
;
510 ssif_info
->i2c_size
= size
;
511 complete(&ssif_info
->wake_thread
);
516 static void msg_done_handler(struct ssif_info
*ssif_info
, int result
,
517 unsigned char *data
, unsigned int len
);
519 static void retry_timeout(unsigned long data
)
521 struct ssif_info
*ssif_info
= (void *) data
;
524 if (ssif_info
->stopping
)
527 ssif_info
->rtc_us_timer
= 0;
529 rv
= ssif_i2c_send(ssif_info
, msg_done_handler
, I2C_SMBUS_READ
,
531 ssif_info
->recv
, I2C_SMBUS_BLOCK_DATA
);
533 /* request failed, just return the error. */
534 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
535 pr_info("Error from i2c_non_blocking_op(5)\n");
537 msg_done_handler(ssif_info
, -EIO
, NULL
, 0);
541 static int start_resend(struct ssif_info
*ssif_info
);
543 static void msg_done_handler(struct ssif_info
*ssif_info
, int result
,
544 unsigned char *data
, unsigned int len
)
546 struct ipmi_smi_msg
*msg
;
547 unsigned long oflags
, *flags
;
551 * We are single-threaded here, so no need for a lock until we
552 * start messing with driver states or the queues.
556 ssif_info
->retries_left
--;
557 if (ssif_info
->retries_left
> 0) {
558 ssif_inc_stat(ssif_info
, receive_retries
);
560 mod_timer(&ssif_info
->retry_timer
,
561 jiffies
+ SSIF_MSG_JIFFIES
);
562 ssif_info
->rtc_us_timer
= SSIF_MSG_USEC
;
566 ssif_inc_stat(ssif_info
, receive_errors
);
568 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
569 pr_info("Error in msg_done_handler: %d\n", result
);
574 if ((len
> 1) && (ssif_info
->multi_pos
== 0)
575 && (data
[0] == 0x00) && (data
[1] == 0x01)) {
576 /* Start of multi-part read. Start the next transaction. */
579 ssif_inc_stat(ssif_info
, received_message_parts
);
581 /* Remove the multi-part read marker. */
582 for (i
= 0; i
< (len
-2); i
++)
583 ssif_info
->data
[i
] = data
[i
+2];
585 ssif_info
->multi_len
= len
;
586 ssif_info
->multi_pos
= 1;
588 rv
= ssif_i2c_send(ssif_info
, msg_done_handler
, I2C_SMBUS_READ
,
589 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE
,
590 ssif_info
->recv
, I2C_SMBUS_BLOCK_DATA
);
592 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
593 pr_info("Error from i2c_non_blocking_op(1)\n");
598 } else if (ssif_info
->multi_pos
) {
599 /* Middle of multi-part read. Start the next transaction. */
601 unsigned char blocknum
;
605 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
606 pr_info(PFX
"Middle message with no data\n");
611 blocknum
= data
[ssif_info
->multi_len
];
613 if (ssif_info
->multi_len
+len
-1 > IPMI_MAX_MSG_LENGTH
) {
614 /* Received message too big, abort the operation. */
616 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
617 pr_info("Received message too big\n");
622 /* Remove the blocknum from the data. */
623 for (i
= 0; i
< (len
-1); i
++)
624 ssif_info
->data
[i
+ssif_info
->multi_len
] = data
[i
+1];
626 ssif_info
->multi_len
+= len
;
627 if (blocknum
== 0xff) {
629 len
= ssif_info
->multi_len
;
630 data
= ssif_info
->data
;
631 } else if ((blocknum
+1) != ssif_info
->multi_pos
) {
633 * Out of sequence block, just abort. Block
634 * numbers start at zero for the second block,
635 * but multi_pos starts at one, so the +1.
639 ssif_inc_stat(ssif_info
, received_message_parts
);
641 ssif_info
->multi_pos
++;
643 rv
= ssif_i2c_send(ssif_info
, msg_done_handler
,
645 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE
,
647 I2C_SMBUS_BLOCK_DATA
);
649 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
651 "Error from i2c_non_blocking_op(2)\n");
660 ssif_inc_stat(ssif_info
, receive_errors
);
662 ssif_inc_stat(ssif_info
, received_messages
);
663 ssif_inc_stat(ssif_info
, received_message_parts
);
668 if (ssif_info
->ssif_debug
& SSIF_DEBUG_STATE
)
669 pr_info(PFX
"DONE 1: state = %d, result=%d.\n",
670 ssif_info
->ssif_state
, result
);
672 flags
= ipmi_ssif_lock_cond(ssif_info
, &oflags
);
673 msg
= ssif_info
->curr_msg
;
676 if (msg
->rsp_size
> IPMI_MAX_MSG_LENGTH
)
677 msg
->rsp_size
= IPMI_MAX_MSG_LENGTH
;
678 memcpy(msg
->rsp
, data
, msg
->rsp_size
);
679 ssif_info
->curr_msg
= NULL
;
682 switch (ssif_info
->ssif_state
) {
684 ipmi_ssif_unlock_cond(ssif_info
, flags
);
689 return_hosed_msg(ssif_info
, msg
);
691 deliver_recv_msg(ssif_info
, msg
);
694 case SSIF_GETTING_FLAGS
:
695 /* We got the flags from the SSIF, now handle them. */
696 if ((result
< 0) || (len
< 4) || (data
[2] != 0)) {
698 * Error fetching flags, or invalid length,
699 * just give up for now.
701 ssif_info
->ssif_state
= SSIF_NORMAL
;
702 ipmi_ssif_unlock_cond(ssif_info
, flags
);
703 pr_warn(PFX
"Error getting flags: %d %d, %x\n",
704 result
, len
, data
[2]);
705 } else if (data
[0] != (IPMI_NETFN_APP_REQUEST
| 1) << 2
706 || data
[1] != IPMI_GET_MSG_FLAGS_CMD
) {
707 pr_warn(PFX
"Invalid response getting flags: %x %x\n",
710 ssif_inc_stat(ssif_info
, flag_fetches
);
711 ssif_info
->msg_flags
= data
[3];
712 handle_flags(ssif_info
, flags
);
716 case SSIF_CLEARING_FLAGS
:
717 /* We cleared the flags. */
718 if ((result
< 0) || (len
< 3) || (data
[2] != 0)) {
719 /* Error clearing flags */
720 pr_warn(PFX
"Error clearing flags: %d %d, %x\n",
721 result
, len
, data
[2]);
722 } else if (data
[0] != (IPMI_NETFN_APP_REQUEST
| 1) << 2
723 || data
[1] != IPMI_CLEAR_MSG_FLAGS_CMD
) {
724 pr_warn(PFX
"Invalid response clearing flags: %x %x\n",
727 ssif_info
->ssif_state
= SSIF_NORMAL
;
728 ipmi_ssif_unlock_cond(ssif_info
, flags
);
731 case SSIF_GETTING_EVENTS
:
732 if ((result
< 0) || (len
< 3) || (msg
->rsp
[2] != 0)) {
733 /* Error getting event, probably done. */
736 /* Take off the event flag. */
737 ssif_info
->msg_flags
&= ~EVENT_MSG_BUFFER_FULL
;
738 handle_flags(ssif_info
, flags
);
739 } else if (msg
->rsp
[0] != (IPMI_NETFN_APP_REQUEST
| 1) << 2
740 || msg
->rsp
[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD
) {
741 pr_warn(PFX
"Invalid response getting events: %x %x\n",
742 msg
->rsp
[0], msg
->rsp
[1]);
744 /* Take off the event flag. */
745 ssif_info
->msg_flags
&= ~EVENT_MSG_BUFFER_FULL
;
746 handle_flags(ssif_info
, flags
);
748 handle_flags(ssif_info
, flags
);
749 ssif_inc_stat(ssif_info
, events
);
750 deliver_recv_msg(ssif_info
, msg
);
754 case SSIF_GETTING_MESSAGES
:
755 if ((result
< 0) || (len
< 3) || (msg
->rsp
[2] != 0)) {
756 /* Error getting event, probably done. */
759 /* Take off the msg flag. */
760 ssif_info
->msg_flags
&= ~RECEIVE_MSG_AVAIL
;
761 handle_flags(ssif_info
, flags
);
762 } else if (msg
->rsp
[0] != (IPMI_NETFN_APP_REQUEST
| 1) << 2
763 || msg
->rsp
[1] != IPMI_GET_MSG_CMD
) {
764 pr_warn(PFX
"Invalid response clearing flags: %x %x\n",
765 msg
->rsp
[0], msg
->rsp
[1]);
768 /* Take off the msg flag. */
769 ssif_info
->msg_flags
&= ~RECEIVE_MSG_AVAIL
;
770 handle_flags(ssif_info
, flags
);
772 ssif_inc_stat(ssif_info
, incoming_messages
);
773 handle_flags(ssif_info
, flags
);
774 deliver_recv_msg(ssif_info
, msg
);
779 flags
= ipmi_ssif_lock_cond(ssif_info
, &oflags
);
780 if (SSIF_IDLE(ssif_info
) && !ssif_info
->stopping
) {
781 if (ssif_info
->req_events
)
782 start_event_fetch(ssif_info
, flags
);
783 else if (ssif_info
->req_flags
)
784 start_flag_fetch(ssif_info
, flags
);
786 start_next_msg(ssif_info
, flags
);
788 ipmi_ssif_unlock_cond(ssif_info
, flags
);
790 if (ssif_info
->ssif_debug
& SSIF_DEBUG_STATE
)
791 pr_info(PFX
"DONE 2: state = %d.\n", ssif_info
->ssif_state
);
794 static void msg_written_handler(struct ssif_info
*ssif_info
, int result
,
795 unsigned char *data
, unsigned int len
)
799 /* We are single-threaded here, so no need for a lock. */
801 ssif_info
->retries_left
--;
802 if (ssif_info
->retries_left
> 0) {
803 if (!start_resend(ssif_info
)) {
804 ssif_inc_stat(ssif_info
, send_retries
);
807 /* request failed, just return the error. */
808 ssif_inc_stat(ssif_info
, send_errors
);
810 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
812 "Out of retries in msg_written_handler\n");
813 msg_done_handler(ssif_info
, -EIO
, NULL
, 0);
817 ssif_inc_stat(ssif_info
, send_errors
);
820 * Got an error on transmit, let the done routine
823 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
824 pr_info("Error in msg_written_handler: %d\n", result
);
826 msg_done_handler(ssif_info
, result
, NULL
, 0);
830 if (ssif_info
->multi_data
) {
831 /* In the middle of a multi-data write. */
834 ssif_inc_stat(ssif_info
, sent_messages_parts
);
836 left
= ssif_info
->multi_len
- ssif_info
->multi_pos
;
840 ssif_info
->multi_data
[ssif_info
->multi_pos
] = left
;
841 ssif_info
->multi_pos
+= left
;
844 * Write is finished. Note that we must end
845 * with a write of less than 32 bytes to
846 * complete the transaction, even if it is
849 ssif_info
->multi_data
= NULL
;
851 rv
= ssif_i2c_send(ssif_info
, msg_written_handler
,
853 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE
,
854 ssif_info
->multi_data
+ ssif_info
->multi_pos
,
855 I2C_SMBUS_BLOCK_DATA
);
857 /* request failed, just return the error. */
858 ssif_inc_stat(ssif_info
, send_errors
);
860 if (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
)
861 pr_info("Error from i2c_non_blocking_op(3)\n");
862 msg_done_handler(ssif_info
, -EIO
, NULL
, 0);
865 ssif_inc_stat(ssif_info
, sent_messages
);
866 ssif_inc_stat(ssif_info
, sent_messages_parts
);
868 /* Wait a jiffie then request the next message */
869 ssif_info
->retries_left
= SSIF_RECV_RETRIES
;
870 ssif_info
->rtc_us_timer
= SSIF_MSG_PART_USEC
;
871 mod_timer(&ssif_info
->retry_timer
,
872 jiffies
+ SSIF_MSG_PART_JIFFIES
);
877 static int start_resend(struct ssif_info
*ssif_info
)
882 if (ssif_info
->data_len
> 32) {
883 command
= SSIF_IPMI_MULTI_PART_REQUEST_START
;
884 ssif_info
->multi_data
= ssif_info
->data
;
885 ssif_info
->multi_len
= ssif_info
->data_len
;
887 * Subtle thing, this is 32, not 33, because we will
888 * overwrite the thing at position 32 (which was just
889 * transmitted) with the new length.
891 ssif_info
->multi_pos
= 32;
892 ssif_info
->data
[0] = 32;
894 ssif_info
->multi_data
= NULL
;
895 command
= SSIF_IPMI_REQUEST
;
896 ssif_info
->data
[0] = ssif_info
->data_len
;
899 rv
= ssif_i2c_send(ssif_info
, msg_written_handler
, I2C_SMBUS_WRITE
,
900 command
, ssif_info
->data
, I2C_SMBUS_BLOCK_DATA
);
901 if (rv
&& (ssif_info
->ssif_debug
& SSIF_DEBUG_MSG
))
902 pr_info("Error from i2c_non_blocking_op(4)\n");
906 static int start_send(struct ssif_info
*ssif_info
,
910 if (len
> IPMI_MAX_MSG_LENGTH
)
912 if (len
> ssif_info
->max_xmit_msg_size
)
915 ssif_info
->retries_left
= SSIF_SEND_RETRIES
;
916 memcpy(ssif_info
->data
+1, data
, len
);
917 ssif_info
->data_len
= len
;
918 return start_resend(ssif_info
);
921 /* Must be called with the message lock held. */
922 static void start_next_msg(struct ssif_info
*ssif_info
, unsigned long *flags
)
924 struct ipmi_smi_msg
*msg
;
925 unsigned long oflags
;
928 if (!SSIF_IDLE(ssif_info
)) {
929 ipmi_ssif_unlock_cond(ssif_info
, flags
);
933 if (!ssif_info
->waiting_msg
) {
934 ssif_info
->curr_msg
= NULL
;
935 ipmi_ssif_unlock_cond(ssif_info
, flags
);
939 ssif_info
->curr_msg
= ssif_info
->waiting_msg
;
940 ssif_info
->waiting_msg
= NULL
;
941 ipmi_ssif_unlock_cond(ssif_info
, flags
);
942 rv
= start_send(ssif_info
,
943 ssif_info
->curr_msg
->data
,
944 ssif_info
->curr_msg
->data_size
);
946 msg
= ssif_info
->curr_msg
;
947 ssif_info
->curr_msg
= NULL
;
948 return_hosed_msg(ssif_info
, msg
);
949 flags
= ipmi_ssif_lock_cond(ssif_info
, &oflags
);
955 static void sender(void *send_info
,
956 struct ipmi_smi_msg
*msg
)
958 struct ssif_info
*ssif_info
= (struct ssif_info
*) send_info
;
959 unsigned long oflags
, *flags
;
961 BUG_ON(ssif_info
->waiting_msg
);
962 ssif_info
->waiting_msg
= msg
;
964 flags
= ipmi_ssif_lock_cond(ssif_info
, &oflags
);
965 start_next_msg(ssif_info
, flags
);
967 if (ssif_info
->ssif_debug
& SSIF_DEBUG_TIMING
) {
971 pr_info("**Enqueue %02x %02x: %ld.%6.6ld\n",
972 msg
->data
[0], msg
->data
[1],
973 (long) t
.tv_sec
, (long) t
.tv_usec
);
977 static int get_smi_info(void *send_info
, struct ipmi_smi_info
*data
)
979 struct ssif_info
*ssif_info
= send_info
;
981 data
->addr_src
= ssif_info
->addr_source
;
982 data
->dev
= &ssif_info
->client
->dev
;
983 data
->addr_info
= ssif_info
->addr_info
;
984 get_device(data
->dev
);
990 * Instead of having our own timer to periodically check the message
991 * flags, we let the message handler drive us.
993 static void request_events(void *send_info
)
995 struct ssif_info
*ssif_info
= (struct ssif_info
*) send_info
;
996 unsigned long oflags
, *flags
;
998 if (!ssif_info
->has_event_buffer
)
1001 flags
= ipmi_ssif_lock_cond(ssif_info
, &oflags
);
1003 * Request flags first, not events, because the lower layer
1004 * doesn't have a way to send an attention. But make sure
1005 * event checking still happens.
1007 ssif_info
->req_events
= true;
1008 if (SSIF_IDLE(ssif_info
))
1009 start_flag_fetch(ssif_info
, flags
);
1011 ssif_info
->req_flags
= true;
1012 ipmi_ssif_unlock_cond(ssif_info
, flags
);
1016 static int inc_usecount(void *send_info
)
1018 struct ssif_info
*ssif_info
= send_info
;
1020 if (!i2c_get_adapter(ssif_info
->client
->adapter
->nr
))
1023 i2c_use_client(ssif_info
->client
);
1027 static void dec_usecount(void *send_info
)
1029 struct ssif_info
*ssif_info
= send_info
;
1031 i2c_release_client(ssif_info
->client
);
1032 i2c_put_adapter(ssif_info
->client
->adapter
);
1035 static int ssif_start_processing(void *send_info
,
1038 struct ssif_info
*ssif_info
= send_info
;
1040 ssif_info
->intf
= intf
;
1045 #define MAX_SSIF_BMCS 4
1047 static unsigned short addr
[MAX_SSIF_BMCS
];
1048 static int num_addrs
;
1049 module_param_array(addr
, ushort
, &num_addrs
, 0);
1050 MODULE_PARM_DESC(addr
, "The addresses to scan for IPMI BMCs on the SSIFs.");
1052 static char *adapter_name
[MAX_SSIF_BMCS
];
1053 static int num_adapter_names
;
1054 module_param_array(adapter_name
, charp
, &num_adapter_names
, 0);
1055 MODULE_PARM_DESC(adapter_name
, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
1057 static int slave_addrs
[MAX_SSIF_BMCS
];
1058 static int num_slave_addrs
;
1059 module_param_array(slave_addrs
, int, &num_slave_addrs
, 0);
1060 MODULE_PARM_DESC(slave_addrs
,
1061 "The default IPMB slave address for the controller.");
1064 * Bit 0 enables message debugging, bit 1 enables state debugging, and
1065 * bit 2 enables timing debugging. This is an array indexed by
1068 static int dbg
[MAX_SSIF_BMCS
];
1070 module_param_array(dbg
, int, &num_dbg
, 0);
1071 MODULE_PARM_DESC(dbg
, "Turn on debugging.");
1073 static bool ssif_dbg_probe
;
1074 module_param_named(dbg_probe
, ssif_dbg_probe
, bool, 0);
1075 MODULE_PARM_DESC(dbg_probe
, "Enable debugging of probing of adapters.");
1077 static int use_thread
;
1078 module_param(use_thread
, int, 0);
1079 MODULE_PARM_DESC(use_thread
, "Use the thread interface.");
1081 static bool ssif_tryacpi
= 1;
1082 module_param_named(tryacpi
, ssif_tryacpi
, bool, 0);
1083 MODULE_PARM_DESC(tryacpi
, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1085 static bool ssif_trydmi
= 1;
1086 module_param_named(trydmi
, ssif_trydmi
, bool, 0);
1087 MODULE_PARM_DESC(trydmi
, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1089 static DEFINE_MUTEX(ssif_infos_mutex
);
1090 static LIST_HEAD(ssif_infos
);
1092 static int ssif_remove(struct i2c_client
*client
)
1094 struct ssif_info
*ssif_info
= i2c_get_clientdata(client
);
1100 i2c_set_clientdata(client
, NULL
);
1103 * After this point, we won't deliver anything asychronously
1104 * to the message handler. We can unregister ourself.
1106 rv
= ipmi_unregister_smi(ssif_info
->intf
);
1108 pr_err(PFX
"Unable to unregister device: errno=%d\n", rv
);
1111 ssif_info
->intf
= NULL
;
1113 /* make sure the driver is not looking for flags any more. */
1114 while (ssif_info
->ssif_state
!= SSIF_NORMAL
)
1115 schedule_timeout(1);
1117 ssif_info
->stopping
= true;
1118 del_timer_sync(&ssif_info
->retry_timer
);
1119 if (ssif_info
->thread
) {
1120 complete(&ssif_info
->wake_thread
);
1121 kthread_stop(ssif_info
->thread
);
1125 * No message can be outstanding now, we have removed the
1126 * upper layer and it permitted us to do so.
1132 static int do_cmd(struct i2c_client
*client
, int len
, unsigned char *msg
,
1133 int *resp_len
, unsigned char *resp
)
1138 retry_cnt
= SSIF_SEND_RETRIES
;
1140 ret
= i2c_smbus_write_block_data(client
, SSIF_IPMI_REQUEST
, len
, msg
);
1149 retry_cnt
= SSIF_RECV_RETRIES
;
1150 while (retry_cnt
> 0) {
1151 ret
= i2c_smbus_read_block_data(client
, SSIF_IPMI_RESPONSE
,
1155 msleep(SSIF_MSG_MSEC
);
1162 /* Validate that the response is correct. */
1164 (resp
[0] != (msg
[0] | (1 << 2))) ||
1165 (resp
[1] != msg
[1]))
1176 static int ssif_detect(struct i2c_client
*client
, struct i2c_board_info
*info
)
1178 unsigned char *resp
;
1179 unsigned char msg
[3];
1183 resp
= kmalloc(IPMI_MAX_MSG_LENGTH
, GFP_KERNEL
);
1187 /* Do a Get Device ID command, since it is required. */
1188 msg
[0] = IPMI_NETFN_APP_REQUEST
<< 2;
1189 msg
[1] = IPMI_GET_DEVICE_ID_CMD
;
1190 rv
= do_cmd(client
, 2, msg
, &len
, resp
);
1194 strlcpy(info
->type
, DEVICE_NAME
, I2C_NAME_SIZE
);
1199 static int smi_type_proc_show(struct seq_file
*m
, void *v
)
1201 return seq_puts(m
, "ssif\n");
1204 static int smi_type_proc_open(struct inode
*inode
, struct file
*file
)
1206 return single_open(file
, smi_type_proc_show
, inode
->i_private
);
1209 static const struct file_operations smi_type_proc_ops
= {
1210 .open
= smi_type_proc_open
,
1212 .llseek
= seq_lseek
,
1213 .release
= single_release
,
1216 static int smi_stats_proc_show(struct seq_file
*m
, void *v
)
1218 struct ssif_info
*ssif_info
= m
->private;
1220 seq_printf(m
, "sent_messages: %u\n",
1221 ssif_get_stat(ssif_info
, sent_messages
));
1222 seq_printf(m
, "sent_messages_parts: %u\n",
1223 ssif_get_stat(ssif_info
, sent_messages_parts
));
1224 seq_printf(m
, "send_retries: %u\n",
1225 ssif_get_stat(ssif_info
, send_retries
));
1226 seq_printf(m
, "send_errors: %u\n",
1227 ssif_get_stat(ssif_info
, send_errors
));
1228 seq_printf(m
, "received_messages: %u\n",
1229 ssif_get_stat(ssif_info
, received_messages
));
1230 seq_printf(m
, "received_message_parts: %u\n",
1231 ssif_get_stat(ssif_info
, received_message_parts
));
1232 seq_printf(m
, "receive_retries: %u\n",
1233 ssif_get_stat(ssif_info
, receive_retries
));
1234 seq_printf(m
, "receive_errors: %u\n",
1235 ssif_get_stat(ssif_info
, receive_errors
));
1236 seq_printf(m
, "flag_fetches: %u\n",
1237 ssif_get_stat(ssif_info
, flag_fetches
));
1238 seq_printf(m
, "hosed: %u\n",
1239 ssif_get_stat(ssif_info
, hosed
));
1240 seq_printf(m
, "events: %u\n",
1241 ssif_get_stat(ssif_info
, events
));
1242 seq_printf(m
, "watchdog_pretimeouts: %u\n",
1243 ssif_get_stat(ssif_info
, watchdog_pretimeouts
));
1247 static int smi_stats_proc_open(struct inode
*inode
, struct file
*file
)
1249 return single_open(file
, smi_stats_proc_show
, PDE_DATA(inode
));
1252 static const struct file_operations smi_stats_proc_ops
= {
1253 .open
= smi_stats_proc_open
,
1255 .llseek
= seq_lseek
,
1256 .release
= single_release
,
1259 static struct ssif_addr_info
*ssif_info_find(unsigned short addr
,
1261 bool match_null_name
)
1263 struct ssif_addr_info
*info
, *found
= NULL
;
1266 list_for_each_entry(info
, &ssif_infos
, link
) {
1267 if (info
->binfo
.addr
== addr
) {
1268 if (info
->adapter_name
|| adapter_name
) {
1269 if (!info
->adapter_name
!= !adapter_name
) {
1270 /* One is NULL and one is not */
1273 if (strcmp(info
->adapter_name
, adapter_name
))
1274 /* Names to not match */
1282 if (!found
&& match_null_name
) {
1283 /* Try to get an exact match first, then try with a NULL name */
1284 adapter_name
= NULL
;
1285 match_null_name
= false;
1292 static bool check_acpi(struct ssif_info
*ssif_info
, struct device
*dev
)
1295 acpi_handle acpi_handle
;
1297 acpi_handle
= ACPI_HANDLE(dev
);
1299 ssif_info
->addr_source
= SI_ACPI
;
1300 ssif_info
->addr_info
.acpi_info
.acpi_handle
= acpi_handle
;
1307 static int ssif_probe(struct i2c_client
*client
, const struct i2c_device_id
*id
)
1309 unsigned char msg
[3];
1310 unsigned char *resp
;
1311 struct ssif_info
*ssif_info
;
1316 struct ssif_addr_info
*addr_info
= NULL
;
1319 resp
= kmalloc(IPMI_MAX_MSG_LENGTH
, GFP_KERNEL
);
1323 ssif_info
= kzalloc(sizeof(*ssif_info
), GFP_KERNEL
);
1329 if (!check_acpi(ssif_info
, &client
->dev
)) {
1330 addr_info
= ssif_info_find(client
->addr
, client
->adapter
->name
,
1333 /* Must have come in through sysfs. */
1334 ssif_info
->addr_source
= SI_HOTMOD
;
1336 ssif_info
->addr_source
= addr_info
->addr_src
;
1337 ssif_info
->ssif_debug
= addr_info
->debug
;
1338 ssif_info
->addr_info
= addr_info
->addr_info
;
1339 slave_addr
= addr_info
->slave_addr
;
1343 pr_info(PFX
"Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1344 ipmi_addr_src_to_str(ssif_info
->addr_source
),
1345 client
->addr
, client
->adapter
->name
, slave_addr
);
1348 * Do a Get Device ID command, since it comes back with some
1351 msg
[0] = IPMI_NETFN_APP_REQUEST
<< 2;
1352 msg
[1] = IPMI_GET_DEVICE_ID_CMD
;
1353 rv
= do_cmd(client
, 2, msg
, &len
, resp
);
1357 rv
= ipmi_demangle_device_id(resp
, len
, &ssif_info
->device_id
);
1361 ssif_info
->client
= client
;
1362 i2c_set_clientdata(client
, ssif_info
);
1364 /* Now check for system interface capabilities */
1365 msg
[0] = IPMI_NETFN_APP_REQUEST
<< 2;
1366 msg
[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD
;
1367 msg
[2] = 0; /* SSIF */
1368 rv
= do_cmd(client
, 3, msg
, &len
, resp
);
1369 if (!rv
&& (len
>= 3) && (resp
[2] == 0)) {
1372 pr_info(PFX
"SSIF info too short: %d\n", len
);
1376 /* Got a good SSIF response, handle it. */
1377 ssif_info
->max_xmit_msg_size
= resp
[5];
1378 ssif_info
->max_recv_msg_size
= resp
[6];
1379 ssif_info
->multi_support
= (resp
[4] >> 6) & 0x3;
1380 ssif_info
->supports_pec
= (resp
[4] >> 3) & 0x1;
1382 /* Sanitize the data */
1383 switch (ssif_info
->multi_support
) {
1385 if (ssif_info
->max_xmit_msg_size
> 32)
1386 ssif_info
->max_xmit_msg_size
= 32;
1387 if (ssif_info
->max_recv_msg_size
> 32)
1388 ssif_info
->max_recv_msg_size
= 32;
1391 case SSIF_MULTI_2_PART
:
1392 if (ssif_info
->max_xmit_msg_size
> 64)
1393 ssif_info
->max_xmit_msg_size
= 64;
1394 if (ssif_info
->max_recv_msg_size
> 62)
1395 ssif_info
->max_recv_msg_size
= 62;
1398 case SSIF_MULTI_n_PART
:
1402 /* Data is not sane, just give up. */
1407 /* Assume no multi-part or PEC support */
1408 pr_info(PFX
"Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1411 ssif_info
->max_xmit_msg_size
= 32;
1412 ssif_info
->max_recv_msg_size
= 32;
1413 ssif_info
->multi_support
= SSIF_NO_MULTI
;
1414 ssif_info
->supports_pec
= 0;
1417 /* Make sure the NMI timeout is cleared. */
1418 msg
[0] = IPMI_NETFN_APP_REQUEST
<< 2;
1419 msg
[1] = IPMI_CLEAR_MSG_FLAGS_CMD
;
1420 msg
[2] = WDT_PRE_TIMEOUT_INT
;
1421 rv
= do_cmd(client
, 3, msg
, &len
, resp
);
1422 if (rv
|| (len
< 3) || (resp
[2] != 0))
1423 pr_warn(PFX
"Unable to clear message flags: %d %d %2.2x\n",
1426 /* Attempt to enable the event buffer. */
1427 msg
[0] = IPMI_NETFN_APP_REQUEST
<< 2;
1428 msg
[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD
;
1429 rv
= do_cmd(client
, 2, msg
, &len
, resp
);
1430 if (rv
|| (len
< 4) || (resp
[2] != 0)) {
1431 pr_warn(PFX
"Error getting global enables: %d %d %2.2x\n",
1433 rv
= 0; /* Not fatal */
1437 if (resp
[3] & IPMI_BMC_EVT_MSG_BUFF
) {
1438 ssif_info
->has_event_buffer
= true;
1439 /* buffer is already enabled, nothing to do. */
1443 msg
[0] = IPMI_NETFN_APP_REQUEST
<< 2;
1444 msg
[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD
;
1445 msg
[2] = resp
[3] | IPMI_BMC_EVT_MSG_BUFF
;
1446 rv
= do_cmd(client
, 3, msg
, &len
, resp
);
1447 if (rv
|| (len
< 2)) {
1448 pr_warn(PFX
"Error getting global enables: %d %d %2.2x\n",
1450 rv
= 0; /* Not fatal */
1455 /* A successful return means the event buffer is supported. */
1456 ssif_info
->has_event_buffer
= true;
1459 ssif_info
->intf_num
= atomic_inc_return(&next_intf
);
1461 if (ssif_dbg_probe
) {
1462 pr_info("ssif_probe: i2c_probe found device at i2c address %x\n",
1466 spin_lock_init(&ssif_info
->lock
);
1467 ssif_info
->ssif_state
= SSIF_NORMAL
;
1468 init_timer(&ssif_info
->retry_timer
);
1469 ssif_info
->retry_timer
.data
= (unsigned long) ssif_info
;
1470 ssif_info
->retry_timer
.function
= retry_timeout
;
1472 for (i
= 0; i
< SSIF_NUM_STATS
; i
++)
1473 atomic_set(&ssif_info
->stats
[i
], 0);
1475 if (ssif_info
->supports_pec
)
1476 ssif_info
->client
->flags
|= I2C_CLIENT_PEC
;
1478 ssif_info
->handlers
.owner
= THIS_MODULE
;
1479 ssif_info
->handlers
.start_processing
= ssif_start_processing
;
1480 ssif_info
->handlers
.get_smi_info
= get_smi_info
;
1481 ssif_info
->handlers
.sender
= sender
;
1482 ssif_info
->handlers
.request_events
= request_events
;
1483 ssif_info
->handlers
.inc_usecount
= inc_usecount
;
1484 ssif_info
->handlers
.dec_usecount
= dec_usecount
;
1487 unsigned int thread_num
;
1489 thread_num
= ((ssif_info
->client
->adapter
->nr
<< 8) |
1490 ssif_info
->client
->addr
);
1491 init_completion(&ssif_info
->wake_thread
);
1492 ssif_info
->thread
= kthread_run(ipmi_ssif_thread
, ssif_info
,
1493 "kssif%4.4x", thread_num
);
1494 if (IS_ERR(ssif_info
->thread
)) {
1495 rv
= PTR_ERR(ssif_info
->thread
);
1496 dev_notice(&ssif_info
->client
->dev
,
1497 "Could not start kernel thread: error %d\n",
1503 rv
= ipmi_register_smi(&ssif_info
->handlers
,
1505 &ssif_info
->device_id
,
1506 &ssif_info
->client
->dev
,
1509 pr_err(PFX
"Unable to register device: error %d\n", rv
);
1513 rv
= ipmi_smi_add_proc_entry(ssif_info
->intf
, "type",
1517 pr_err(PFX
"Unable to create proc entry: %d\n", rv
);
1521 rv
= ipmi_smi_add_proc_entry(ssif_info
->intf
, "ssif_stats",
1522 &smi_stats_proc_ops
,
1525 pr_err(PFX
"Unable to create proc entry: %d\n", rv
);
1536 ipmi_unregister_smi(ssif_info
->intf
);
1540 static int ssif_adapter_handler(struct device
*adev
, void *opaque
)
1542 struct ssif_addr_info
*addr_info
= opaque
;
1544 if (adev
->type
!= &i2c_adapter_type
)
1547 i2c_new_device(to_i2c_adapter(adev
), &addr_info
->binfo
);
1549 if (!addr_info
->adapter_name
)
1550 return 1; /* Only try the first I2C adapter by default. */
1554 static int new_ssif_client(int addr
, char *adapter_name
,
1555 int debug
, int slave_addr
,
1556 enum ipmi_addr_src addr_src
)
1558 struct ssif_addr_info
*addr_info
;
1561 mutex_lock(&ssif_infos_mutex
);
1562 if (ssif_info_find(addr
, adapter_name
, false)) {
1567 addr_info
= kzalloc(sizeof(*addr_info
), GFP_KERNEL
);
1574 addr_info
->adapter_name
= kstrdup(adapter_name
, GFP_KERNEL
);
1575 if (!addr_info
->adapter_name
) {
1582 strncpy(addr_info
->binfo
.type
, DEVICE_NAME
,
1583 sizeof(addr_info
->binfo
.type
));
1584 addr_info
->binfo
.addr
= addr
;
1585 addr_info
->binfo
.platform_data
= addr_info
;
1586 addr_info
->debug
= debug
;
1587 addr_info
->slave_addr
= slave_addr
;
1588 addr_info
->addr_src
= addr_src
;
1590 list_add_tail(&addr_info
->link
, &ssif_infos
);
1593 i2c_for_each_dev(addr_info
, ssif_adapter_handler
);
1594 /* Otherwise address list will get it */
1597 mutex_unlock(&ssif_infos_mutex
);
1601 static void free_ssif_clients(void)
1603 struct ssif_addr_info
*info
, *tmp
;
1605 mutex_lock(&ssif_infos_mutex
);
1606 list_for_each_entry_safe(info
, tmp
, &ssif_infos
, link
) {
1607 list_del(&info
->link
);
1608 kfree(info
->adapter_name
);
1611 mutex_unlock(&ssif_infos_mutex
);
1614 static unsigned short *ssif_address_list(void)
1616 struct ssif_addr_info
*info
;
1617 unsigned int count
= 0, i
;
1618 unsigned short *address_list
;
1620 list_for_each_entry(info
, &ssif_infos
, link
)
1623 address_list
= kzalloc(sizeof(*address_list
) * (count
+ 1), GFP_KERNEL
);
1628 list_for_each_entry(info
, &ssif_infos
, link
) {
1629 unsigned short addr
= info
->binfo
.addr
;
1632 for (j
= 0; j
< i
; j
++) {
1633 if (address_list
[j
] == addr
)
1636 address_list
[i
] = addr
;
1640 address_list
[i
] = I2C_CLIENT_END
;
1642 return address_list
;
1646 static struct acpi_device_id ssif_acpi_match
[] = {
1650 MODULE_DEVICE_TABLE(acpi
, ssif_acpi_match
);
1653 * Once we get an ACPI failure, we don't try any more, because we go
1654 * through the tables sequentially. Once we don't find a table, there
1657 static int acpi_failure
;
1660 * Defined in the IPMI 2.0 spec.
1671 s8 CreatorRevision
[4];
1674 s16 SpecificationRevision
;
1677 * Bit 0 - SCI interrupt supported
1678 * Bit 1 - I/O APIC/SAPIC
1683 * If bit 0 of InterruptType is set, then this is the SCI
1684 * interrupt in the GPEx_STS register.
1691 * If bit 1 of InterruptType is set, then this is the I/O
1692 * APIC/SAPIC interrupt.
1694 u32 GlobalSystemInterrupt
;
1696 /* The actual register address. */
1697 struct acpi_generic_address addr
;
1701 s8 spmi_id
[1]; /* A '\0' terminated array starts here. */
1704 static int try_init_spmi(struct SPMITable
*spmi
)
1706 unsigned short myaddr
;
1708 if (num_addrs
>= MAX_SSIF_BMCS
)
1711 if (spmi
->IPMIlegacy
!= 1) {
1712 pr_warn("IPMI: Bad SPMI legacy: %d\n", spmi
->IPMIlegacy
);
1716 if (spmi
->InterfaceType
!= 4)
1719 if (spmi
->addr
.space_id
!= ACPI_ADR_SPACE_SMBUS
) {
1720 pr_warn(PFX
"Invalid ACPI SSIF I/O Address type: %d\n",
1721 spmi
->addr
.space_id
);
1725 myaddr
= spmi
->addr
.address
>> 1;
1727 return new_ssif_client(myaddr
, NULL
, 0, 0, SI_SPMI
);
1730 static void spmi_find_bmc(void)
1733 struct SPMITable
*spmi
;
1742 for (i
= 0; ; i
++) {
1743 status
= acpi_get_table(ACPI_SIG_SPMI
, i
+1,
1744 (struct acpi_table_header
**)&spmi
);
1745 if (status
!= AE_OK
)
1748 try_init_spmi(spmi
);
1752 static void spmi_find_bmc(void) { }
1756 static int decode_dmi(const struct dmi_device
*dmi_dev
)
1758 struct dmi_header
*dm
= dmi_dev
->device_data
;
1759 u8
*data
= (u8
*) dm
;
1760 u8 len
= dm
->length
;
1761 unsigned short myaddr
;
1764 if (num_addrs
>= MAX_SSIF_BMCS
)
1770 if (data
[0x04] != 4) /* Not SSIF */
1773 if ((data
[8] >> 1) == 0) {
1775 * Some broken systems put the I2C address in
1776 * the slave address field. We try to
1777 * accommodate them here.
1779 myaddr
= data
[6] >> 1;
1782 myaddr
= data
[8] >> 1;
1783 slave_addr
= data
[6];
1786 return new_ssif_client(myaddr
, NULL
, 0, 0, SI_SMBIOS
);
1789 static void dmi_iterator(void)
1791 const struct dmi_device
*dev
= NULL
;
1793 while ((dev
= dmi_find_device(DMI_DEV_TYPE_IPMI
, NULL
, dev
)))
1797 static void dmi_iterator(void) { }
1800 static const struct i2c_device_id ssif_id
[] = {
1804 MODULE_DEVICE_TABLE(i2c
, ssif_id
);
1806 static struct i2c_driver ssif_i2c_driver
= {
1807 .class = I2C_CLASS_HWMON
,
1809 .owner
= THIS_MODULE
,
1812 .probe
= ssif_probe
,
1813 .remove
= ssif_remove
,
1814 .id_table
= ssif_id
,
1815 .detect
= ssif_detect
1818 static int init_ipmi_ssif(void)
1826 pr_info("IPMI SSIF Interface driver\n");
1828 /* build list for i2c from addr list */
1829 for (i
= 0; i
< num_addrs
; i
++) {
1830 rv
= new_ssif_client(addr
[i
], adapter_name
[i
],
1831 dbg
[i
], slave_addrs
[i
],
1835 "Couldn't add hardcoded device at addr 0x%x\n",
1840 ssif_i2c_driver
.driver
.acpi_match_table
=
1841 ACPI_PTR(ssif_acpi_match
);
1847 ssif_i2c_driver
.address_list
= ssif_address_list();
1849 rv
= i2c_add_driver(&ssif_i2c_driver
);
1855 module_init(init_ipmi_ssif
);
1857 static void cleanup_ipmi_ssif(void)
1862 initialized
= false;
1864 i2c_del_driver(&ssif_i2c_driver
);
1866 free_ssif_clients();
1868 module_exit(cleanup_ipmi_ssif
);
1870 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
1871 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
1872 MODULE_LICENSE("GPL");