[PATCH] ipmi: enable interrupts on the BT driver

Enable interrupts for a BT interface.  There is a specific register that
needs to be set up to enable interrupts that also must be modified to clear
the irq.

Also, don't reset the BMC on a BT interface.  That's probably not a good
idea as the BMC may be performing other important functions and a reset
should only be a last resort.  Also, that register is also used to
enable/disable interrupts to the BT; modifying it may screw up the
interrupts.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 35 insertions, 6 deletions

diff --git a/drivers/char/ipmi/ipmi_bt_sm.c b/drivers/char/ipmi/ipmi_bt_sm.c
index 225b330115bb..5ce9c6269033 100644
--- a/drivers/char/ipmi/ipmi_bt_sm.c
+++ b/drivers/char/ipmi/ipmi_bt_sm.c
@@ -235,7 +235,6 @@ static void reset_flags(struct si_sm_data *bt)
         if (BT_STATUS & BT_B_BUSY) BT_CONTROL(BT_B_BUSY);
         BT_CONTROL(BT_CLR_WR_PTR);
         BT_CONTROL(BT_SMS_ATN);
-        BT_INTMASK_W(BT_BMC_HWRST);
 #ifdef DEVELOPMENT_ONLY_NOT_FOR_PRODUCTION
         if (BT_STATUS & BT_B2H_ATN) {
                 int i;
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 7522bd5f94da..5419440087fd 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -100,6 +100,11 @@ enum si_intf_state {
         /* FIXME - add watchdog stuff. */
 };
 
+/* Some BT-specific defines we need here. */
+#define IPMI_BT_INTMASK_REG             2
+#define IPMI_BT_INTMASK_CLEAR_IRQ_BIT   2
+#define IPMI_BT_INTMASK_ENABLE_IRQ_BIT  1
+
 enum si_type {
     SI_KCS, SI_SMIC, SI_BT
 };
@@ -875,6 +880,17 @@ static irqreturn_t si_irq_handler(int irq, void *data, struct pt_regs *regs)
         return IRQ_HANDLED;
 }
 
+static irqreturn_t si_bt_irq_handler(int irq, void *data, struct pt_regs *regs)
+{
+        struct smi_info *smi_info = data;
+        /* We need to clear the IRQ flag for the BT interface. */
+        smi_info->io.outputb(&smi_info->io, IPMI_BT_INTMASK_REG,
+                             IPMI_BT_INTMASK_CLEAR_IRQ_BIT
+                             | IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
+        return si_irq_handler(irq, data, regs);
+}
+
+
 static struct ipmi_smi_handlers handlers =
 {
         .owner                  = THIS_MODULE,
@@ -1001,11 +1017,22 @@ static int std_irq_setup(struct smi_info *info)
         if (!info->irq)
                 return 0;
 
-        rv = request_irq(info->irq,
-                         si_irq_handler,
-                         SA_INTERRUPT,
-                         DEVICE_NAME,
-                         info);
+        if (info->si_type == SI_BT) {
+                rv = request_irq(info->irq,
+                                 si_bt_irq_handler,
+                                 SA_INTERRUPT,
+                                 DEVICE_NAME,
+                                 info);
+                if (!rv)
+                        /* Enable the interrupt in the BT interface. */
+                        info->io.outputb(&info->io, IPMI_BT_INTMASK_REG,
+                                         IPMI_BT_INTMASK_ENABLE_IRQ_BIT);
+        } else
+                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,"
@@ -1024,6 +1051,9 @@ static void std_irq_cleanup(struct smi_info *info)
         if (!info->irq)
                 return;
 
+        if (info->si_type == SI_BT)
+                /* Disable the interrupt in the BT interface. */
+                info->io.outputb(&info->io, IPMI_BT_INTMASK_REG, 0);
         free_irq(info->irq, info);
 }