ipmi: add options to disable openfirmware and PCI scanning

Add try...  parameters to disable pci and platform (openfirmware) device
scanning for IPMI.  Also add docs for all the try...  parameters.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/IPMI.txt

@@ -348,34 +348,40 @@ You can change this at module load time (for a module) with:
 
   modprobe ipmi_si.o type=<type1>,<type2>....
        ports=<port1>,<port2>... addrs=<addr1>,<addr2>...
-       irqs=<irq1>,<irq2>... trydefaults=[0|1]
+       irqs=<irq1>,<irq2>...
        regspacings=<sp1>,<sp2>,... regsizes=<size1>,<size2>,...
        regshifts=<shift1>,<shift2>,...
        slave_addrs=<addr1>,<addr2>,...
        force_kipmid=<enable1>,<enable2>,...
        kipmid_max_busy_us=<ustime1>,<ustime2>,...
        unload_when_empty=[0|1]
+       trydefaults=[0|1] trydmi=[0|1] tryacpi=[0|1]
+       tryplatform=[0|1] trypci=[0|1]
 
-Each of these except si_trydefaults is a list, the first item for the
+Each of these except try... items is a list, the first item for the
 first interface, second item for the second interface, etc.
 
 The si_type may be either "kcs", "smic", or "bt".  If you leave it blank, it
 defaults to "kcs".
 
-If you specify si_addrs as non-zero for an interface, the driver will
+If you specify addrs as non-zero for an interface, the driver will
 use the memory address given as the address of the device.  This
 overrides si_ports.
 
-If you specify si_ports as non-zero for an interface, the driver will
+If you specify ports as non-zero for an interface, the driver will
 use the I/O port given as the device address.
 
-If you specify si_irqs as non-zero for an interface, the driver will
+If you specify irqs as non-zero for an interface, the driver will
 attempt to use the given interrupt for the device.
 
-si_trydefaults sets whether the standard IPMI interface at 0xca2 and
+trydefaults sets whether the standard IPMI interface at 0xca2 and
 any interfaces specified by ACPE are tried.  By default, the driver
 tries it, set this value to zero to turn this off.
 
+The other try... items disable discovery by their corresponding
+names.  These are all enabled by default, set them to zero to disable
+them.  The tryplatform disables openfirmware.
+
 The next three parameters have to do with register layout.  The
 registers used by the interfaces may not appear at successive
 locations and they may not be in 8-bit registers.  These parameters

drivers/char/ipmi/ipmi_si_intf.c

@@ -1214,6 +1214,10 @@ static bool          si_tryacpi = 1;
 #ifdef CONFIG_DMI
 static bool          si_trydmi = 1;
 #endif
+static bool          si_tryplatform = 1;
+#ifdef CONFIG_PCI
+static bool          si_trypci = 1;
+#endif
 static bool          si_trydefaults = 1;
 static char          *si_type[SI_MAX_PARMS];
 #define MAX_SI_TYPE_STR 30
@@ -1254,6 +1258,15 @@ module_param_named(trydmi, si_trydmi, bool, 0);
 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
 		 " default scan of the interfaces identified via DMI");
 #endif
+module_param_named(tryplatform, si_tryplatform, bool, 0);
+MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
+		 " default scan of the interfaces identified via platform"
+		 " interfaces like openfirmware");
+#ifdef CONFIG_PCI
+module_param_named(trypci, si_trypci, bool, 0);
+MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
+		 " default scan of the interfaces identified via pci");
+#endif
 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"
@@ -3387,13 +3400,15 @@ static int init_ipmi_si(void)
 		return 0;
 	initialized = 1;
 
-	rv = platform_driver_register(&ipmi_driver);
-	if (rv) {
-		printk(KERN_ERR PFX "Unable to register driver: %d\n", rv);
-		return rv;
+	if (si_tryplatform) {
+		rv = platform_driver_register(&ipmi_driver);
+		if (rv) {
+			printk(KERN_ERR PFX "Unable to register "
+			       "driver: %d\n", rv);
+			return rv;
+		}
 	}
 
-
 	/* Parse out the si_type string into its components. */
 	str = si_type_str;
 	if (*str != '\0') {
@@ -3416,11 +3431,14 @@ static int init_ipmi_si(void)
 		return 0;
 
 #ifdef CONFIG_PCI
-	rv = pci_register_driver(&ipmi_pci_driver);
-	if (rv)
-		printk(KERN_ERR PFX "Unable to register PCI driver: %d\n", rv);
-	else
-		pci_registered = 1;
+	if (si_trypci) {
+		rv = pci_register_driver(&ipmi_pci_driver);
+		if (rv)
+			printk(KERN_ERR PFX "Unable to register "
+			       "PCI driver: %d\n", rv);
+		else
+			pci_registered = 1;
+	}
 #endif
 
 #ifdef CONFIG_ACPI