x86: Add Moorestown early detection

Moorestown MID devices need to be detected early in the boot process
to setup and do not call x86_default_early_setup as there is no EBDA
region to reserve.

[ Copied the minimal code from Jacobs latest MRST series ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jacob Pan <jacob.jun.pan@intel.com>

5 files changed, 47 insertions, 0 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 13ffa5df37d7..586d84557f75 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -318,6 +318,7 @@ config X86_EXTENDED_PLATFORM
                 SGI 320/540 (Visual Workstation)
                 Summit/EXA (IBM x440)
                 Unisys ES7000 IA32 series
+                Moorestown MID devices
 
           If you have one of these systems, or if you want to build a
           generic distribution kernel, say Y here - otherwise say N.
@@ -377,6 +378,18 @@ config X86_ELAN
 
           If unsure, choose "PC-compatible" instead.
 
+config X86_MRST
+       bool "Moorestown MID platform"
+        depends on X86_32
+        depends on X86_EXTENDED_PLATFORM
+        ---help---
+          Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
+          Internet Device(MID) platform. Moorestown consists of two chips:
+          Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
+          Unlike standard x86 PCs, Moorestown does not have many legacy devices
+          nor standard legacy replacement devices/features. e.g. Moorestown does
+          not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
+
 config X86_RDC321X
         bool "RDC R-321x SoC"
         depends on X86_32
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 861e1fe2303b..18e496c98ff0 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -49,6 +49,12 @@ extern void reserve_standard_io_resources(void);
 extern void i386_reserve_resources(void);
 extern void setup_default_timer_irq(void);
 
+#ifdef CONFIG_X86_MRST
+extern void x86_mrst_early_setup(void);
+#else
+static inline void x86_mrst_early_setup(void) { }
+#endif
+
 #ifndef _SETUP
 
 /*
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index ccf3db607c2d..5f33316610dc 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_SCx200)		+= scx200.o
 scx200-y                        += scx200_32.o
 
 obj-$(CONFIG_OLPC)              += olpc.o
+obj-$(CONFIG_X86_MRST)          += mrst.o
 
 microcode-y                             := microcode_core.o
 microcode-$(CONFIG_MICROCODE_INTEL)     += microcode_intel.o
diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 441c075e2b80..4f8e2507e8f3 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -45,6 +45,9 @@ void __init i386_start_kernel(void)
 
         /* Call the subarch specific early setup function */
         switch (boot_params.hdr.hardware_subarch) {
+        case X86_SUBARCH_MRST:
+                x86_mrst_early_setup();
+                break;
         default:
                 i386_default_early_setup();
                 break;
diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
new file mode 100644
index 000000000000..3b7078abc871
--- /dev/null
+++ b/arch/x86/kernel/mrst.c
@@ -0,0 +1,24 @@
+/*
+ * mrst.c: Intel Moorestown platform specific setup code
+ *
+ * (C) Copyright 2008 Intel Corporation
+ * Author: Jacob Pan (jacob.jun.pan@intel.com)
+ *
+ * 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; version 2
+ * of the License.
+ */
+#include <linux/init.h>
+
+#include <asm/setup.h>
+
+/*
+ * Moorestown specific x86_init function overrides and early setup
+ * calls.
+ */
+void __init x86_mrst_early_setup(void)
+{
+        x86_init.resources.probe_roms = x86_init_noop;
+        x86_init.resources.reserve_resources = x86_init_noop;
+}