make tda(4) run the fans at maximum speed when we are about to drop

drop to ddb(4) in order to avoid overheating in case of a system crash.

ok kettenis@

4 files changed, 57 insertions, 5 deletions

diff --git a/sys/arch/sparc64/conf/files.sparc64 b/sys/arch/sparc64/conf/files.sparc64
index d46e3b1e2f4..d1f3f010175 100644
--- a/sys/arch/sparc64/conf/files.sparc64
+++ b/sys/arch/sparc64/conf/files.sparc64
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.sparc64,v 1.94 2008/02/12 10:12:14 robert Exp $
+#	$OpenBSD: files.sparc64,v 1.95 2008/02/20 09:44:47 robert Exp $
 #	$NetBSD: files.sparc64,v 1.50 2001/08/10 20:53:50 eeh Exp $
 
 # maxpartitions must be first item in files.${ARCH}
@@ -314,7 +314,7 @@ file	arch/sparc64/dev/pcf8591_envctrl.c	ecadc
 # TDA8444 (sparc64 only for now)
 device	tda
 attach	tda at i2c
-file	arch/sparc64/dev/tda.c			tda
+file	arch/sparc64/dev/tda.c			tda needs-flag
 
 #
 # Machine-independent GPIO drivers
diff --git a/sys/arch/sparc64/dev/tda.c b/sys/arch/sparc64/dev/tda.c
index eb00ac3ca72..ca5cdfa8d98 100644
--- a/sys/arch/sparc64/dev/tda.c
+++ b/sys/arch/sparc64/dev/tda.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tda.c,v 1.2 2008/02/18 21:23:00 kettenis Exp $ */
+/*	$OpenBSD: tda.c,v 1.3 2008/02/20 09:44:47 robert Exp $ */
 
 /*
  * Copyright (c) 2008 Robert Nagy <robert@openbsd.org>
@@ -74,6 +74,8 @@ struct cfdriver tda_cd = {
 	NULL, "tda", DV_DULL
 };
 
+void *tda_cookie;
+
 int
 tda_match(struct device *parent, void *match, void *aux)
 {
@@ -122,6 +124,8 @@ tda_attach(struct device *parent, struct device *self, void *aux)
 		printf("%s: unable to register update task\n", DEVNAME(sc));
 		return;
 	}
+
+	tda_cookie = sc;
 }
 
 void
@@ -218,3 +222,43 @@ tda_adjust(void *v)
 out:
 	tda_setspeed(sc);
 }
+
+/* This code gets called when we are about to drop to ddb,
+ * in order to operate the fans at full speed during the
+ * timeouts are not working.
+ */
+void
+tda_full_blast()
+{
+	struct tda_softc *sc = tda_cookie;
+	u_int8_t cmd[2];
+
+	if (sc == NULL)
+		return;
+
+	sc->sc_cfan_speed = sc->sc_sfan_speed = TDA_FANSPEED_MAX;
+
+	iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+
+	cmd[0] = TDA_CPUFAN_REG;
+	cmd[1] = sc->sc_cfan_speed;
+	if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof(cmd), NULL, 0, 0)) {
+		printf("%s: cannot write cpu-fan register\n",
+		    DEVNAME(sc));
+		iic_release_bus(sc->sc_tag, I2C_F_POLL);
+		return;
+        }
+
+	cmd[0] = TDA_SYSFAN_REG;
+	cmd[1] = sc->sc_sfan_speed;
+	if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof(cmd), NULL, 0, 0)) {
+		printf("%s: cannot write system-fan register\n",
+		    DEVNAME(sc));
+		iic_release_bus(sc->sc_tag, I2C_F_POLL);
+		return;
+	}
+
+	iic_release_bus(sc->sc_tag, I2C_F_POLL);
+}
diff --git a/sys/arch/sparc64/include/cpu.h b/sys/arch/sparc64/include/cpu.h
index 7aadcad9a87..a78e72b34c8 100644
--- a/sys/arch/sparc64/include/cpu.h
+++ b/sys/arch/sparc64/include/cpu.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: cpu.h,v 1.54 2008/02/18 10:37:20 robert Exp $	*/
+/*	$OpenBSD: cpu.h,v 1.55 2008/02/20 09:44:47 robert Exp $	*/
 /*	$NetBSD: cpu.h,v 1.28 2001/06/14 22:56:58 thorpej Exp $ */
 
 /*
@@ -255,6 +255,8 @@ void zs_kgdb_init(void);
 #endif
 /* fb.c */
 void	fb_unblank(void);
+/* tda.c */
+void	tda_full_blast(void);
 /* kgdb_stub.c */
 #ifdef KGDB
 void kgdb_attach(int (*)(void *), void (*)(void *, int), void *);
diff --git a/sys/arch/sparc64/sparc64/db_interface.c b/sys/arch/sparc64/sparc64/db_interface.c
index 94dc495514e..b97e756765f 100644
--- a/sys/arch/sparc64/sparc64/db_interface.c
+++ b/sys/arch/sparc64/sparc64/db_interface.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: db_interface.c,v 1.24 2007/10/27 22:20:16 martin Exp $	*/
+/*	$OpenBSD: db_interface.c,v 1.25 2008/02/20 09:44:47 robert Exp $	*/
 /*	$NetBSD: db_interface.c,v 1.61 2001/07/31 06:55:47 eeh Exp $ */
 
 /*
@@ -59,6 +59,8 @@
 #include "esp_sbus.h"
 #endif
 
+#include "tda.h"
+
 db_regs_t	ddb_regs;	/* register state */
 
 extern void OF_enter(void);
@@ -259,6 +261,10 @@ kdb_trap(type, tf)
 
 	trap_trace_dis++;
 
+#if NTDA > 0
+	tda_full_blast();
+#endif
+
 	fb_unblank();
 
 	switch (type) {