goldfish: platform device for x86

Based on code by Jun Nakajima but stripped of all the old x86 mach-foo
stuff and turned into a single file for the Goldfish virtual bus layer.

The actual created platform device and bus enumeration is portable between the
ARM and x86 Goldfish emulations.

Signed-off-by: Sheng Yang <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Yunhong Jiang <[e-mail]>
Signed-off-by: Xiaohui Xin <[e-mail]>
Signed-off-by: Jun Nakajima <[e-mail]>
Signed-off-by: Bruce Beare <[e-mail]>
[Ported to 3.7 and reorganised so that we can keep most of the code
shared properly]
Signed-off-by: Alan Cox <[e-mail]>
Signed-off-by: H. Peter Anvin <[e-mail]>
Cc: Matthew Garrett <[e-mail]>

arch/x86/Kconfig

···
 	---help---
 	  This option is needed for the systems that have more than 8 CPUs
 
+config GOLDFISH
+       def_bool y
+       depends on X86_GOLDFISH
+
 if X86_32
 config X86_EXTENDED_PLATFORM
 	bool "Support for extended (non-PC) x86 platforms"
···
 
 # Following is an alphabetically sorted list of 32 bit extended platforms
 # Please maintain the alphabetic order if and when there are additions
+
+config X86_GOLDFISH
+       bool "Goldfish (Virtual Platform)"
+       depends on X86_32
+       ---help---
+	 Enable support for the Goldfish virtual platform used primarily
+	 for Android development. Unless you are building for the Android
+	 Goldfish emulator say N here.
 
 config X86_INTEL_CE
 	bool "CE4100 TV platform"

arch/x86/platform/Makefile

···
 obj-y	+= ce4100/
 obj-y	+= efi/
 obj-y	+= geode/
+obj-y	+= goldfish/
 obj-y	+= iris/
 obj-y	+= mrst/
 obj-y	+= olpc/

arch/x86/platform/goldfish/Makefile

···
+obj-$(CONFIG_GOLDFISH)	+= goldfish.o

arch/x86/platform/goldfish/goldfish.c

···
+/*
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (C) 2011 Intel, Inc.
+ * Copyright (C) 2013 Intel, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+
+/*
+ * Where in virtual device memory the IO devices (timers, system controllers
+ * and so on)
+ */
+
+#define GOLDFISH_PDEV_BUS_BASE	(0xff001000)
+#define GOLDFISH_PDEV_BUS_END	(0xff7fffff)
+#define GOLDFISH_PDEV_BUS_IRQ	(4)
+
+#define GOLDFISH_TTY_BASE	(0x2000)
+
+static struct resource goldfish_pdev_bus_resources[] = {
+	{
+		.start  = GOLDFISH_PDEV_BUS_BASE,
+		.end    = GOLDFISH_PDEV_BUS_END,
+		.flags  = IORESOURCE_MEM,
+	},
+	{
+		.start	= GOLDFISH_PDEV_BUS_IRQ,
+		.end	= GOLDFISH_PDEV_BUS_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	}
+};
+
+static int __init goldfish_init(void)
+{
+	platform_device_register_simple("goldfish_pdev_bus", -1,
+						goldfish_pdev_bus_resources, 2);
+	return 0;
+}
+device_initcall(goldfish_init);