diff options
Diffstat (limited to 'drivers/char/ipmi/ipmi_si_intf.c')
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_intf.c | 2359 |
1 files changed, 2359 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c new file mode 100644 index 00000000000..29de259a981 --- /dev/null +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -0,0 +1,2359 @@ +/* + * ipmi_si.c + * + * The interface to the IPMI driver for the system interfaces (KCS, SMIC, + * BT). + * + * Author: MontaVista Software, Inc. + * Corey Minyard <minyard@mvista.com> + * source@mvista.com + * + * Copyright 2002 MontaVista Software Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* + * This file holds the "policy" for the interface to the SMI state + * machine. It does the configuration, handles timers and interrupts, + * and drives the real SMI state machine. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <asm/system.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/errno.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/pci.h> +#include <linux/ioport.h> +#include <asm/irq.h> +#ifdef CONFIG_HIGH_RES_TIMERS +#include <linux/hrtime.h> +# if defined(schedule_next_int) +/* Old high-res timer code, do translations. */ +# define get_arch_cycles(a) quick_update_jiffies_sub(a) +# define arch_cycles_per_jiffy cycles_per_jiffies +# endif +static inline void add_usec_to_timer(struct timer_list *t, long v) +{ + t->sub_expires += nsec_to_arch_cycle(v * 1000); + while (t->sub_expires >= arch_cycles_per_jiffy) + { + t->expires++; + t->sub_expires -= arch_cycles_per_jiffy; + } +} +#endif +#include <linux/interrupt.h> +#include <linux/rcupdate.h> +#include <linux/ipmi_smi.h> +#include <asm/io.h> +#include "ipmi_si_sm.h" +#include <linux/init.h> + +#define IPMI_SI_VERSION "v33" + +/* Measure times between events in the driver. */ +#undef DEBUG_TIMING + +/* Call every 10 ms. */ +#define SI_TIMEOUT_TIME_USEC 10000 +#define SI_USEC_PER_JIFFY (1000000/HZ) +#define SI_TIMEOUT_JIFFIES (SI_TIMEOUT_TIME_USEC/SI_USEC_PER_JIFFY) +#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a + short timeout */ + +enum si_intf_state { + SI_NORMAL, + SI_GETTING_FLAGS, + SI_GETTING_EVENTS, + SI_CLEARING_FLAGS, + SI_CLEARING_FLAGS_THEN_SET_IRQ, + SI_GETTING_MESSAGES, + SI_ENABLE_INTERRUPTS1, + SI_ENABLE_INTERRUPTS2 + /* FIXME - add watchdog stuff. */ +}; + +enum si_type { + SI_KCS, SI_SMIC, SI_BT +}; + +struct smi_info +{ + ipmi_smi_t intf; + struct si_sm_data *si_sm; + struct si_sm_handlers *handlers; + enum si_type si_type; + spinlock_t si_lock; + spinlock_t msg_lock; + struct list_head xmit_msgs; + struct list_head hp_xmit_msgs; + struct ipmi_smi_msg *curr_msg; + enum si_intf_state si_state; + + /* Used to handle the various types of I/O that can occur with + IPMI */ + struct si_sm_io io; + int (*io_setup)(struct smi_info *info); + void (*io_cleanup)(struct smi_info *info); + int (*irq_setup)(struct smi_info *info); + void (*irq_cleanup)(struct smi_info *info); + unsigned int io_size; + + /* Flags from the last GET_MSG_FLAGS command, used when an ATTN + is set to hold the flags until we are done handling everything + from the flags. */ +#define RECEIVE_MSG_AVAIL 0x01 +#define EVENT_MSG_BUFFER_FULL 0x02 +#define WDT_PRE_TIMEOUT_INT 0x08 + unsigned char msg_flags; + + /* If set to true, this will request events the next time the + state machine is idle. */ + atomic_t req_events; + + /* If true, run the state machine to completion on every send + call. Generally used after a panic to make sure stuff goes + out. */ + int run_to_completion; + + /* The I/O port of an SI interface. */ + int port; + + /* The space between start addresses of the two ports. For + instance, if the first port is 0xca2 and the spacing is 4, then + the second port is 0xca6. */ + unsigned int spacing; + + /* zero if no irq; */ + int irq; + + /* The timer for this si. */ + struct timer_list si_timer; + + /* The time (in jiffies) the last timeout occurred at. */ + unsigned long last_timeout_jiffies; + + /* Used to gracefully stop the timer without race conditions. */ + volatile int stop_operation; + volatile int timer_stopped; + + /* The driver will disable interrupts when it gets into a + situation where it cannot handle messages due to lack of + memory. Once that situation clears up, it will re-enable + interrupts. */ + int interrupt_disabled; + + unsigned char ipmi_si_dev_rev; + unsigned char ipmi_si_fw_rev_major; + unsigned char ipmi_si_fw_rev_minor; + unsigned char ipmi_version_major; + unsigned char ipmi_version_minor; + + /* Slave address, could be reported from DMI. */ + unsigned char slave_addr; + + /* Counters and things for the proc filesystem. */ + spinlock_t count_lock; + unsigned long short_timeouts; + unsigned long long_timeouts; + unsigned long timeout_restarts; + unsigned long idles; + unsigned long interrupts; + unsigned long attentions; + unsigned long flag_fetches; + unsigned long hosed_count; + unsigned long complete_transactions; + unsigned long events; + unsigned long watchdog_pretimeouts; + unsigned long incoming_messages; +}; + +static void si_restart_short_timer(struct smi_info *smi_info); + +static void deliver_recv_msg(struct smi_info *smi_info, + struct ipmi_smi_msg *msg) +{ + /* Deliver the message to the upper layer with the lock + released. */ + spin_unlock(&(smi_info->si_lock)); + ipmi_smi_msg_received(smi_info->intf, msg); + spin_lock(&(smi_info->si_lock)); +} + +static void return_hosed_msg(struct smi_info *smi_info) +{ + struct ipmi_smi_msg *msg = smi_info->curr_msg; + + /* Make it a reponse */ + msg->rsp[0] = msg->data[0] | 4; + msg->rsp[1] = msg->data[1]; + msg->rsp[2] = 0xFF; /* Unknown error. */ + msg->rsp_size = 3; + + smi_info->curr_msg = NULL; + deliver_recv_msg(smi_info, msg); +} + +static enum si_sm_result start_next_msg(struct smi_info *smi_info) +{ + int rv; + struct list_head *entry = NULL; +#ifdef DEBUG_TIMING + struct timeval t; +#endif + + /* No need to save flags, we aleady have interrupts off and we + already hold the SMI lock. */ + spin_lock(&(smi_info->msg_lock)); + + /* Pick the high priority queue first. */ + if (! list_empty(&(smi_info->hp_xmit_msgs))) { + entry = smi_info->hp_xmit_msgs.next; + } else if (! list_empty(&(smi_info->xmit_msgs))) { + entry = smi_info->xmit_msgs.next; + } + + if (!entry) { + smi_info->curr_msg = NULL; + rv = SI_SM_IDLE; + } else { + int err; + + list_del(entry); + smi_info->curr_msg = list_entry(entry, + struct ipmi_smi_msg, + link); +#ifdef DEBUG_TIMING + do_gettimeofday(&t); + printk("**Start2: %d.%9.9d\n", t.tv_sec, t.tv_usec); +#endif + err = smi_info->handlers->start_transaction( + smi_info->si_sm, + smi_info->curr_msg->data, + smi_info->curr_msg->data_size); + if (err) { + return_hosed_msg(smi_info); + } + + rv = SI_SM_CALL_WITHOUT_DELAY; + } + spin_unlock(&(smi_info->msg_lock)); + + return rv; +} + +static void start_enable_irq(struct smi_info *smi_info) +{ + unsigned char msg[2]; + + /* If we are enabling interrupts, we have to tell the + BMC to use them. */ + msg[0] = (IPMI_NETFN_APP_REQUEST << 2); + msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD; + + smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2); + smi_info->si_state = SI_ENABLE_INTERRUPTS1; +} + +static void start_clear_flags(struct smi_info *smi_info) +{ + unsigned char msg[3]; + + /* Make sure the watchdog pre-timeout flag is not set at startup. */ + msg[0] = (IPMI_NETFN_APP_REQUEST << 2); + msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD; + msg[2] = WDT_PRE_TIMEOUT_INT; + + smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3); + smi_info->si_state = SI_CLEARING_FLAGS; +} + +/* When we have a situtaion where we run out of memory and cannot + allocate messages, we just leave them in the BMC and run the system + polled until we can allocate some memory. Once we have some + memory, we will re-enable the interrupt. */ +static inline void disable_si_irq(struct smi_info *smi_info) +{ + if ((smi_info->irq) && (!smi_info->interrupt_disabled)) { + disable_irq_nosync(smi_info->irq); + smi_info->interrupt_disabled = 1; + } +} + +static inline void enable_si_irq(struct smi_info *smi_info) +{ + if ((smi_info->irq) && (smi_info->interrupt_disabled)) { + enable_irq(smi_info->irq); + smi_info->interrupt_disabled = 0; + } +} + +static void handle_flags(struct smi_info *smi_info) +{ + if (smi_info->msg_flags & WDT_PRE_TIMEOUT_INT) { + /* Watchdog pre-timeout */ + spin_lock(&smi_info->count_lock); + smi_info->watchdog_pretimeouts++; + spin_unlock(&smi_info->count_lock); + + start_clear_flags(smi_info); + smi_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT; + spin_unlock(&(smi_info->si_lock)); + ipmi_smi_watchdog_pretimeout(smi_info->intf); + spin_lock(&(smi_info->si_lock)); + } else if (smi_info->msg_flags & RECEIVE_MSG_AVAIL) { + /* Messages available. */ + smi_info->curr_msg = ipmi_alloc_smi_msg(); + if (!smi_info->curr_msg) { + disable_si_irq(smi_info); + smi_info->si_state = SI_NORMAL; + return; + } + enable_si_irq(smi_info); + + smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); + smi_info->curr_msg->data[1] = IPMI_GET_MSG_CMD; + smi_info->curr_msg->data_size = 2; + + smi_info->handlers->start_transaction( + smi_info->si_sm, + smi_info->curr_msg->data, + smi_info->curr_msg->data_size); + smi_info->si_state = SI_GETTING_MESSAGES; + } else if (smi_info->msg_flags & EVENT_MSG_BUFFER_FULL) { + /* Events available. */ + smi_info->curr_msg = ipmi_alloc_smi_msg(); + if (!smi_info->curr_msg) { + disable_si_irq(smi_info); + smi_info->si_state = SI_NORMAL; + return; + } + enable_si_irq(smi_info); + + smi_info->curr_msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2); + smi_info->curr_msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD; + smi_info->curr_msg->data_size = 2; + + smi_info->handlers->start_transaction( + smi_info->si_sm, + smi_info->curr_msg->data, + smi_info->curr_msg->data_size); + smi_info->si_state = SI_GETTING_EVENTS; + } else { + smi_info->si_state = SI_NORMAL; + } +} + +static void handle_transaction_done(struct smi_info *smi_info) +{ + struct ipmi_smi_msg *msg; +#ifdef DEBUG_TIMING + struct timeval t; + + do_gettimeofday(&t); + printk("**Done: %d.%9.9d\n", t.tv_sec, t.tv_usec); +#endif + switch (smi_info->si_state) { + case SI_NORMAL: + if (!smi_info->curr_msg) + break; + + smi_info->curr_msg->rsp_size + = smi_info->handlers->get_result( + smi_info->si_sm, + smi_info->curr_msg->rsp, + IPMI_MAX_MSG_LENGTH); + + /* Do this here becase deliver_recv_msg() releases the + lock, and a new message can be put in during the + time the lock is released. */ + msg = smi_info->curr_msg; + smi_info->curr_msg = NULL; + deliver_recv_msg(smi_info, msg); + break; + + case SI_GETTING_FLAGS: + { + unsigned char msg[4]; + unsigned int len; + + /* We got the flags from the SMI, now handle them. */ + len = smi_info->handlers->get_result(smi_info->si_sm, msg, 4); + if (msg[2] != 0) { + /* Error fetching flags, just give up for + now. */ + smi_info->si_state = SI_NORMAL; + } else if (len < 4) { + /* Hmm, no flags. That's technically illegal, but + don't use uninitialized data. */ + smi_info->si_state = SI_NORMAL; + } else { + smi_info->msg_flags = msg[3]; + handle_flags(smi_info); + } + break; + } + + case SI_CLEARING_FLAGS: + case SI_CLEARING_FLAGS_THEN_SET_IRQ: + { + unsigned char msg[3]; + + /* We cleared the flags. */ + smi_info->handlers->get_result(smi_info->si_sm, msg, 3); + if (msg[2] != 0) { + /* Error clearing flags */ + printk(KERN_WARNING + "ipmi_si: Error clearing flags: %2.2x\n", + msg[2]); + } + if (smi_info->si_state == SI_CLEARING_FLAGS_THEN_SET_IRQ) + start_enable_irq(smi_info); + else + smi_info->si_state = SI_NORMAL; + break; + } + + case SI_GETTING_EVENTS: + { + smi_info->curr_msg->rsp_size + = smi_info->handlers->get_result( + smi_info->si_sm, + smi_info->curr_msg->rsp, + IPMI_MAX_MSG_LENGTH); + + /* Do this here becase deliver_recv_msg() releases the + lock, and a new message can be put in during the + time the lock is released. */ + msg = smi_info->curr_msg; + smi_info->curr_msg = NULL; + if (msg->rsp[2] != 0) { + /* Error getting event, probably done. */ + msg->done(msg); + + /* Take off the event flag. */ + smi_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL; + handle_flags(smi_info); + } else { + spin_lock(&smi_info->count_lock); + smi_info->events++; + spin_unlock(&smi_info->count_lock); + + /* Do this before we deliver the message + because delivering the message releases the + lock and something else can mess with the + state. */ + handle_flags(smi_info); + + deliver_recv_msg(smi_info, msg); + } + break; + } + + case SI_GETTING_MESSAGES: + { + smi_info->curr_msg->rsp_size + = smi_info->handlers->get_result( + smi_info->si_sm, + smi_info->curr_msg->rsp, + IPMI_MAX_MSG_LENGTH); + + /* Do this here becase deliver_recv_msg() releases the + lock, and a new message can be put in during the + time the lock is released. */ + msg = smi_info->curr_msg; + smi_info->curr_msg = NULL; + if (msg->rsp[2] != 0) { + /* Error getting event, probably done. */ + msg->done(msg); + + /* Take off the msg flag. */ + smi_info->msg_flags &= ~RECEIVE_MSG_AVAIL; + handle_flags(smi_info); + } else { + spin_lock(&smi_info->count_lock); + smi_info->incoming_messages++; + spin_unlock(&smi_info->count_lock); + + /* Do this before we deliver the message + because delivering the message releases the + lock and something else can mess with the + state. */ + handle_flags(smi_info); + + deliver_recv_msg(smi_info, msg); + } + break; + } + + case SI_ENABLE_INTERRUPTS1: + { + unsigned char msg[4]; + + /* We got the flags from the SMI, now handle them. */ + smi_info->handlers->get_result(smi_info->si_sm, msg, 4); + if (msg[2] != 0) { + printk(KERN_WARNING + "ipmi_si: Could not enable interrupts" + ", failed get, using polled mode.\n"); + smi_info->si_state = SI_NORMAL; + } else { + msg[0] = (IPMI_NETFN_APP_REQUEST << 2); + msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD; + msg[2] = msg[3] | 1; /* enable msg queue int */ + smi_info->handlers->start_transaction( + smi_info->si_sm, msg, 3); + smi_info->si_state = SI_ENABLE_INTERRUPTS2; + } + break; + } + + case SI_ENABLE_INTERRUPTS2: + { + unsigned char msg[4]; + + /* We got the flags from the SMI, now handle them. */ + smi_info->handlers->get_result(smi_info->si_sm, msg, 4); + if (msg[2] != 0) { + printk(KERN_WARNING + "ipmi_si: Could not enable interrupts" + ", failed set, using polled mode.\n"); + } + smi_info->si_state = SI_NORMAL; + break; + } + } +} + +/* Called on timeouts and events. Timeouts should pass the elapsed + time, interrupts should pass in zero. */ +static enum si_sm_result smi_event_handler(struct smi_info *smi_info, + int time) +{ + enum si_sm_result si_sm_result; + + restart: + /* There used to be a loop here that waited a little while + (around 25us) before giving up. That turned out to be + pointless, the minimum delays I was seeing were in the 300us + range, which is far too long to wait in an interrupt. So + we just run until the state machine tells us something + happened or it needs a delay. */ + si_sm_result = smi_info->handlers->event(smi_info->si_sm, time); + time = 0; + while (si_sm_result == SI_SM_CALL_WITHOUT_DELAY) + { + si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); + } + + if (si_sm_result == SI_SM_TRANSACTION_COMPLETE) + { + spin_lock(&smi_info->count_lock); + smi_info->complete_transactions++; + spin_unlock(&smi_info->count_lock); + + handle_transaction_done(smi_info); + si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); + } + else if (si_sm_result == SI_SM_HOSED) + { + spin_lock(&smi_info->count_lock); + smi_info->hosed_count++; + spin_unlock(&smi_info->count_lock); + + /* Do the before return_hosed_msg, because that + releases the lock. */ + smi_info->si_state = SI_NORMAL; + if (smi_info->curr_msg != NULL) { + /* If we were handling a user message, format + a response to send to the upper layer to + tell it about the error. */ + return_hosed_msg(smi_info); + } + si_sm_result = smi_info->handlers->event(smi_info->si_sm, 0); + } + + /* We prefer handling attn over new messages. */ + if (si_sm_result == SI_SM_ATTN) + { + unsigned char msg[2]; + + spin_lock(&smi_info->count_lock); + smi_info->attentions++; + spin_unlock(&smi_info->count_lock); + + /* Got a attn, send down a get message flags to see + what's causing it. It would be better to handle + this in the upper layer, but due to the way + interrupts work with the SMI, that's not really + possible. */ + msg[0] = (IPMI_NETFN_APP_REQUEST << 2); + msg[1] = IPMI_GET_MSG_FLAGS_CMD; + + smi_info->handlers->start_transaction( + smi_info->si_sm, msg, 2); + smi_info->si_state = SI_GETTING_FLAGS; + goto restart; + } + + /* If we are currently idle, try to start the next message. */ + if (si_sm_result == SI_SM_IDLE) { + spin_lock(&smi_info->count_lock); + smi_info->idles++; + spin_unlock(&smi_info->count_lock); + + si_sm_result = start_next_msg(smi_info); + if (si_sm_result != SI_SM_IDLE) + goto restart; + } + + if ((si_sm_result == SI_SM_IDLE) + && (atomic_read(&smi_info->req_events))) + { + /* We are idle and the upper layer requested that I fetch + events, so do so. */ + unsigned char msg[2]; + + spin_lock(&smi_info->count_lock); + smi_info->flag_fetches++; + spin_unlock(&smi_info->count_lock); + + atomic_set(&smi_info->req_events, 0); + msg[0] = (IPMI_NETFN_APP_REQUEST << 2); + msg[1] = IPMI_GET_MSG_FLAGS_CMD; + + smi_info->handlers->start_transaction( + smi_info->si_sm, msg, 2); + smi_info->si_state = SI_GETTING_FLAGS; + goto restart; + } + + return si_sm_result; +} + +static void sender(void *send_info, + struct ipmi_smi_msg *msg, + int priority) +{ + struct smi_info *smi_info = send_info; + enum si_sm_result result; + unsigned long flags; +#ifdef DEBUG_TIMING + struct timeval t; +#endif + + spin_lock_irqsave(&(smi_info->msg_lock), flags); +#ifdef DEBUG_TIMING + do_gettimeofday(&t); + printk("**Enqueue: %d.%9.9d\n", t.tv_sec, t.tv_usec); +#endif + + if (smi_info->run_to_completion) { + /* If we are running to completion, then throw it in + the list and run transactions until everything is + clear. Priority doesn't matter here. */ + list_add_tail(&(msg->link), &(smi_info->xmit_msgs)); + + /* We have to release the msg lock and claim the smi + lock in this case, because of race conditions. */ + spin_unlock_irqrestore(&(smi_info->msg_lock), flags); + + spin_lock_irqsave(&(smi_info->si_lock), flags); + result = smi_event_handler(smi_info, 0); + while (result != SI_SM_IDLE) { + udelay(SI_SHORT_TIMEOUT_USEC); + result = smi_event_handler(smi_info, + SI_SHORT_TIMEOUT_USEC); + } + spin_unlock_irqrestore(&(smi_info->si_lock), flags); + return; + } else { + if (priority > 0) { + list_add_tail(&(msg->link), &(smi_info->hp_xmit_msgs)); + } else { + list_add_tail(&(msg->link), &(smi_info->xmit_msgs)); + } + } + spin_unlock_irqrestore(&(smi_info->msg_lock), flags); + + spin_lock_irqsave(&(smi_info->si_lock), flags); + if ((smi_info->si_state == SI_NORMAL) + && (smi_info->curr_msg == NULL)) + { + start_next_msg(smi_info); + si_restart_short_timer(smi_info); + } + spin_unlock_irqrestore(&(smi_info->si_lock), flags); +} + +static void set_run_to_completion(void *send_info, int i_run_to_completion) +{ + struct smi_info *smi_info = send_info; + enum si_sm_result result; + unsigned long flags; + + spin_lock_irqsave(&(smi_info->si_lock), flags); + + smi_info->run_to_completion = i_run_to_completion; + if (i_run_to_completion) { + result = smi_event_handler(smi_info, 0); + while (result != SI_SM_IDLE) { + udelay(SI_SHORT_TIMEOUT_USEC); + result = smi_event_handler(smi_info, + SI_SHORT_TIMEOUT_USEC); + } + } + + spin_unlock_irqrestore(&(smi_info->si_lock), flags); +} + +static void poll(void *send_info) +{ + struct smi_info *smi_info = send_info; + + smi_event_handler(smi_info, 0); +} + +static void request_events(void *send_info) +{ + struct smi_info *smi_info = send_info; + + atomic_set(&smi_info->req_events, 1); +} + +static int initialized = 0; + +/* Must be called with interrupts off and with the si_lock held. */ +static void si_restart_short_timer(struct smi_info *smi_info) +{ +#if defined(CONFIG_HIGH_RES_TIMERS) + unsigned long flags; + unsigned long jiffies_now; + + if (del_timer(&(smi_info->si_timer))) { + /* If we don't delete the timer, then it will go off + immediately, anyway. So we only process if we + actually delete the timer. */ + + /* We already have irqsave on, so no need for it + here. */ + read_lock(&xtime_lock); + jiffies_now = jiffies; + smi_info->si_timer.expires = jiffies_now; + smi_info->si_timer.sub_expires = get_arch_cycles(jiffies_now); + + add_usec_to_timer(&smi_info->si_timer, SI_SHORT_TIMEOUT_USEC); + + add_timer(&(smi_info->si_timer)); + spin_lock_irqsave(&smi_info->count_lock, flags); + smi_info->timeout_restarts++; + spin_unlock_irqrestore(&smi_info->count_lock, flags); + } +#endif +} + +static void smi_timeout(unsigned long data) +{ + struct smi_info *smi_info = (struct smi_info *) data; + enum si_sm_result smi_result; + unsigned long flags; + unsigned long jiffies_now; + unsigned long time_diff; +#ifdef DEBUG_TIMING + struct timeval t; +#endif + + if (smi_info->stop_operation) { + smi_info->timer_stopped = 1; + return; + } + + spin_lock_irqsave(&(smi_info->si_lock), flags); +#ifdef DEBUG_TIMING + do_gettimeofday(&t); + printk("**Timer: %d.%9.9d\n", t.tv_sec, t.tv_usec); +#endif + jiffies_now = jiffies; + time_diff = ((jiffies_now - smi_info->last_timeout_jiffies) + * SI_USEC_PER_JIFFY); + smi_result = smi_event_handler(smi_info, time_diff); + + spin_unlock_irqrestore(&(smi_info->si_lock), flags); + + smi_info->last_timeout_jiffies = jiffies_now; + + if ((smi_info->irq) && (! smi_info->interrupt_disabled)) { + /* Running with interrupts, only do long timeouts. */ + smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES; + spin_lock_irqsave(&smi_info->count_lock, flags); + smi_info->long_timeouts++; + spin_unlock_irqrestore(&smi_info->count_lock, flags); + goto do_add_timer; + } + + /* If the state machine asks for a short delay, then shorten + the timer timeout. */ + if (smi_result == SI_SM_CALL_WITH_DELAY) { + spin_lock_irqsave(&smi_info->count_lock, flags); + smi_info->short_timeouts++; + spin_unlock_irqrestore(&smi_info->count_lock, flags); +#if defined(CONFIG_HIGH_RES_TIMERS) + read_lock(&xtime_lock); + smi_info->si_timer.expires = jiffies; + smi_info->si_timer.sub_expires + = get_arch_cycles(smi_info->si_timer.expires); + read_unlock(&xtime_lock); + add_usec_to_timer(&smi_info->si_timer, SI_SHORT_TIMEOUT_USEC); +#else + smi_info->si_timer.expires = jiffies + 1; +#endif + } else { + spin_lock_irqsave(&smi_info->count_lock, flags); + smi_info->long_timeouts++; + spin_unlock_irqrestore(&smi_info->count_lock, flags); + smi_info->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES; +#if defined(CONFIG_HIGH_RES_TIMERS) + smi_info->si_timer.sub_expires = 0; +#endif + } + + do_add_timer: + add_timer(&(smi_info->si_timer)); +} + +static irqreturn_t si_irq_handler(int irq, void *data, struct pt_regs *regs) +{ + struct smi_info *smi_info = data; + unsigned long flags; +#ifdef DEBUG_TIMING + struct timeval t; +#endif + + spin_lock_irqsave(&(smi_info->si_lock), flags); + + spin_lock(&smi_info->count_lock); + smi_info->interrupts++; + spin_unlock(&smi_info->count_lock); + + if (smi_info->stop_operation) + goto out; + +#ifdef DEBUG_TIMING + do_gettimeofday(&t); + printk("**Interrupt: %d.%9.9d\n", t.tv_sec, t.tv_usec); +#endif + smi_event_handler(smi_info, 0); + out: + spin_unlock_irqrestore(&(smi_info->si_lock), flags); + return IRQ_HANDLED; +} + +static struct ipmi_smi_handlers handlers = +{ + .owner = THIS_MODULE, + .sender = sender, + .request_events = request_events, + .set_run_to_completion = set_run_to_completion, + .poll = poll, +}; + +/* There can be 4 IO ports passed in (with or without IRQs), 4 addresses, + a default IO port, and 1 ACPI/SPMI address. That sets SI_MAX_DRIVERS */ + +#define SI_MAX_PARMS 4 +#define SI_MAX_DRIVERS ((SI_MAX_PARMS * 2) + 2) +static struct smi_info *smi_infos[SI_MAX_DRIVERS] = +{ NULL, NULL, NULL, NULL }; + +#define DEVICE_NAME "ipmi_si" + +#define DEFAULT_KCS_IO_PORT 0xca2 +#define DEFAULT_SMIC_IO_PORT 0xca9 +#define DEFAULT_BT_IO_PORT 0xe4 +#define DEFAULT_REGSPACING 1 + +static int si_trydefaults = 1; +static char *si_type[SI_MAX_PARMS]; +#define MAX_SI_TYPE_STR 30 +static char si_type_str[MAX_SI_TYPE_STR]; +static unsigned long addrs[SI_MAX_PARMS]; +static int num_addrs; +static unsigned int ports[SI_MAX_PARMS]; +static int num_ports; +static int irqs[SI_MAX_PARMS]; +static int num_irqs; +static int regspacings[SI_MAX_PARMS]; +static int num_regspacings = 0; +static int regsizes[SI_MAX_PARMS]; +static int num_regsizes = 0; +static int regshifts[SI_MAX_PARMS]; +static int num_regshifts = 0; +static int slave_addrs[SI_MAX_PARMS]; +static int num_slave_addrs = 0; + + +module_param_named(trydefaults, si_trydefaults, bool, 0); +MODULE_PARM_DESC(trydefaults, "Setting this to 'false' will disable the" + " default scan of the KCS and SMIC interface at the standard" + " address"); +module_param_string(type, si_type_str, MAX_SI_TYPE_STR, 0); +MODULE_PARM_DESC(type, "Defines the type of each interface, each" + " interface separated by commas. The types are 'kcs'," + " 'smic', and 'bt'. For example si_type=kcs,bt will set" + " the first interface to kcs and the second to bt"); +module_param_array(addrs, long, &num_addrs, 0); +MODULE_PARM_DESC(addrs, "Sets the memory address of each interface, the" + " addresses separated by commas. Only use if an interface" + " is in memory. Otherwise, set it to zero or leave" + " it blank."); +module_param_array(ports, int, &num_ports, 0); +MODULE_PARM_DESC(ports, "Sets the port address of each interface, the" + " addresses separated by commas. Only use if an interface" + " is a port. Otherwise, set it to zero or leave" + " it blank."); +module_param_array(irqs, int, &num_irqs, 0); +MODULE_PARM_DESC(irqs, "Sets the interrupt of each interface, the" + " addresses separated by commas. Only use if an interface" + " has an interrupt. Otherwise, set it to zero or leave" + " it blank."); +module_param_array(regspacings, int, &num_regspacings, 0); +MODULE_PARM_DESC(regspacings, "The number of bytes between the start address" + " and each successive register used by the interface. For" + " instance, if the start address is 0xca2 and the spacing" + " is 2, then the second address is at 0xca4. Defaults" + " to 1."); +module_param_array(regsizes, int, &num_regsizes, 0); +MODULE_PARM_DESC(regsizes, "The size of the specific IPMI register in bytes." + " This should generally be 1, 2, 4, or 8 for an 8-bit," + " 16-bit, 32-bit, or 64-bit register. Use this if you" + " the 8-bit IPMI register has to be read from a larger" + " register."); +module_param_array(regshifts, int, &num_regshifts, 0); +MODULE_PARM_DESC(regshifts, "The amount to shift the data read from the." + " IPMI register, in bits. For instance, if the data" + " is read from a 32-bit word and the IPMI data is in" + " bit 8-15, then the shift would be 8"); +module_param_array(slave_addrs, int, &num_slave_addrs, 0); +MODULE_PARM_DESC(slave_addrs, "Set the default IPMB slave address for" + " the controller. Normally this is 0x20, but can be" + " overridden by this parm. This is an array indexed" + " by interface number."); + + +#define IPMI_MEM_ADDR_SPACE 1 +#define IPMI_IO_ADDR_SPACE 2 + +#if defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_X86) || defined(CONFIG_PCI) +static int is_new_interface(int intf, u8 addr_space, unsigned long base_addr) +{ + int i; + + for (i = 0; i < SI_MAX_PARMS; ++i) { + /* Don't check our address. */ + if (i == intf) + continue; + if (si_type[i] != NULL) { + if ((addr_space == IPMI_MEM_ADDR_SPACE && + base_addr == addrs[i]) || + (addr_space == IPMI_IO_ADDR_SPACE && + base_addr == ports[i])) + return 0; + } + else + break; + } + + return 1; +} +#endif + +static int std_irq_setup(struct smi_info *info) +{ + int rv; + + if (!info->irq) + return 0; + + rv = request_irq(info->irq, + si_irq_handler, + SA_INTERRUPT, + DEVICE_NAME, + info); + if (rv) { + printk(KERN_WARNING + "ipmi_si: %s unable to claim interrupt %d," + " running polled\n", + DEVICE_NAME, info->irq); + info->irq = 0; + } else { + printk(" Using irq %d\n", info->irq); + } + + return rv; +} + +static void std_irq_cleanup(struct smi_info *info) +{ + if (!info->irq) + return; + + free_irq(info->irq, info); +} + +static unsigned char port_inb(struct si_sm_io *io, unsigned int offset) +{ + unsigned int *addr = io->info; + + return inb((*addr)+(offset*io->regspacing)); +} + +static void port_outb(struct si_sm_io *io, unsigned int offset, + unsigned char b) +{ + unsigned int *addr = io->info; + + outb(b, (*addr)+(offset * io->regspacing)); +} + +static unsigned char port_inw(struct si_sm_io *io, unsigned int offset) +{ + unsigned int *addr = io->info; + + return (inw((*addr)+(offset * io->regspacing)) >> io->regshift) & 0xff; +} + +static void port_outw(struct si_sm_io *io, unsigned int offset, + unsigned char b) +{ + unsigned int *addr = io->info; + + outw(b << io->regshift, (*addr)+(offset * io->regspacing)); +} + +static unsigned char port_inl(struct si_sm_io *io, unsigned int offset) +{ + unsigned int *addr = io->info; + + return (inl((*addr)+(offset * io->regspacing)) >> io->regshift) & 0xff; +} + +static void port_outl(struct si_sm_io *io, unsigned int offset, + unsigned char b) +{ + unsigned int *addr = io->info; + + outl(b << io->regshift, (*addr)+(offset * io->regspacing)); +} + +static void port_cleanup(struct smi_info *info) +{ + unsigned int *addr = info->io.info; + int mapsize; + + if (addr && (*addr)) { + mapsize = ((info->io_size * info->io.regspacing) + - (info->io.regspacing - info->io.regsize)); + + release_region (*addr, mapsize); + } + kfree(info); +} + +static int port_setup(struct smi_info *info) +{ + unsigned int *addr = info->io.info; + int mapsize; + + if (!addr || (!*addr)) + return -ENODEV; + + info->io_cleanup = port_cleanup; + + /* Figure out the actual inb/inw/inl/etc routine to use based + upon the register size. */ + switch (info->io.regsize) { + case 1: + info->io.inputb = port_inb; + info->io.outputb = port_outb; + break; + case 2: + info->io.inputb = port_inw; + info->io.outputb = port_outw; + break; + case 4: + info->io.inputb = port_inl; + info->io.outputb = port_outl; + break; + default: + printk("ipmi_si: Invalid register size: %d\n", + info->io.regsize); + return -EINVAL; + } + + /* Calculate the total amount of memory to claim. This is an + * unusual looking calculation, but it avoids claiming any + * more memory than it has to. It will claim everything + * between the first address to the end of the last full + * register. */ + mapsize = ((info->io_size * info->io.regspacing) + - (info->io.regspacing - info->io.regsize)); + + if (request_region(*addr, mapsize, DEVICE_NAME) == NULL) + return -EIO; + return 0; +} + +static int try_init_port(i |