[PATCH] update legacy io handling for pmac

ppc can boot one single binary on prep, chrp and pmac boards.  ppc64 can
boot one single binary on pseries and G5 boards.  pmac has no legacy io,
probing for PC style legacy hardware (or accessing the legacy io area
regulary) may lead to a hard crash:

* add check for parport_pc, exit on pmac.  32bit chrp has no
  ->check_legacy_ioport, the probe is always called.  64bit chrp has
  check_legacy_ioport, check for a "parallel" node

* add check for isapnp, only PReP boards may have real ISA slots.  32bit
  PReP will have no ->check_legacy_ioport, the probe is always called.

* update code in i8042_platform_init.  Run ->check_legacy_ioport first,
  always call request_region.  No functional change.  Remove whitespace
  before i8042_reset init.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/powerpc/platforms/pseries/setup.c

@@ -415,6 +415,12 @@ static int pSeries_check_legacy_ioport(unsigned int baseport)
 			return -ENODEV;
 		of_node_put(np);
 		break;
+	case PARALLEL_BASE:
+		np = of_find_node_by_type(NULL, "parallel");
+		if (np == NULL)
+			return -ENODEV;
+		of_node_put(np);
+		break;
 	}
 	return 0;
 }

drivers/input/serio/i8042-io.h

@@ -67,25 +67,22 @@ static inline int i8042_platform_init(void)
  * On some platforms touching the i8042 data register region can do really
  * bad things. Because of this the region is always reserved on such boxes.
  */
-#if !defined(__sh__) && !defined(__alpha__) && !defined(__mips__) && !defined(CONFIG_PPC_MERGE)
-	if (!request_region(I8042_DATA_REG, 16, "i8042"))
-		return -EBUSY;
-#endif
-
-        i8042_reset = 1;
-
 #if defined(CONFIG_PPC_MERGE)
 	if (check_legacy_ioport(I8042_DATA_REG))
-		return -EBUSY;
+		return -ENODEV;
+#endif
+#if !defined(__sh__) && !defined(__alpha__) && !defined(__mips__)
 	if (!request_region(I8042_DATA_REG, 16, "i8042"))
 		return -EBUSY;
 #endif
+
+	i8042_reset = 1;
 	return 0;
 }
 
 static inline void i8042_platform_exit(void)
 {
-#if !defined(__sh__) && !defined(__alpha__) && !defined(CONFIG_PPC64)
+#if !defined(__sh__) && !defined(__alpha__)
 	release_region(I8042_DATA_REG, 16);
 #endif
 }

drivers/parport/parport_pc.c

@@ -3374,6 +3374,10 @@ __setup("parport_init_mode=",parport_init_mode_setup);
 
 static int __init parport_pc_init(void)
 {
+#if defined(CONFIG_PPC_MERGE)
+	if (check_legacy_ioport(PARALLEL_BASE))
+		return -ENODEV;
+#endif
 	if (parse_parport_params())
 		return -EINVAL;
 

drivers/pnp/pnpbios/core.c

@@ -526,6 +526,10 @@ static int __init pnpbios_init(void)
 {
 	int ret;
 
+#if defined(CONFIG_PPC_MERGE)
+	if (check_legacy_ioport(PNPBIOS_BASE))
+		return -ENODEV;
+#endif
 	if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) {
 		printk(KERN_INFO "PnPBIOS: Disabled\n");
 		return -ENODEV;
@@ -575,6 +579,10 @@ subsys_initcall(pnpbios_init);
 
 static int __init pnpbios_thread_init(void)
 {
+#if defined(CONFIG_PPC_MERGE)
+	if (check_legacy_ioport(PNPBIOS_BASE))
+		return 0;
+#endif
 	if (pnpbios_disabled)
 		return 0;
 #ifdef CONFIG_HOTPLUG

include/asm-powerpc/io.h

@@ -11,6 +11,8 @@
 
 /* Check of existence of legacy devices */
 extern int check_legacy_ioport(unsigned long base_port);
+#define PARALLEL_BASE	0x378
+#define PNPBIOS_BASE	0xf000	/* only relevant for PReP */
 
 #ifndef CONFIG_PPC64
 #include <asm-ppc/io.h>