mn10300: add the MN10300/AM33 architecture to the kernel

Add architecture support for the MN10300/AM33 CPUs produced by MEI to the
kernel.

This patch also adds board support for the ASB2303 with the ASB2308 daughter
board, and the ASB2305.  The only processor supported is the MN103E010, which
is an AM33v2 core plus on-chip devices.

[akpm@linux-foundation.org: nuke cvs control strings]
Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com>
Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 168 insertions, 0 deletions

diff --git a/include/asm-mn10300/thread_info.h b/include/asm-mn10300/thread_info.h
new file mode 100644
index 00000000000..e397e719278
--- /dev/null
+++ b/include/asm-mn10300/thread_info.h
@@ -0,0 +1,168 @@
+/* MN10300 Low-level thread information
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _ASM_THREAD_INFO_H
+#define _ASM_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#include <asm/page.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#endif
+
+#define PREEMPT_ACTIVE		0x10000000
+
+#ifdef CONFIG_4KSTACKS
+#define THREAD_SIZE		(4096)
+#else
+#define THREAD_SIZE		(8192)
+#endif
+
+#define STACK_WARN		(THREAD_SIZE / 8)
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed, the assembly constants
+ *   must also be changed
+ */
+#ifndef __ASSEMBLY__
+
+struct thread_info {
+	struct task_struct	*task;		/* main task structure */
+	struct exec_domain	*exec_domain;	/* execution domain */
+	unsigned long		flags;		/* low level flags */
+	__u32			cpu;		/* current CPU */
+	__s32			preempt_count;	/* 0 => preemptable, <0 => BUG */
+
+	mm_segment_t		addr_limit;	/* thread address space:
+						   0-0xBFFFFFFF for user-thead
+						   0-0xFFFFFFFF for kernel-thread
+						*/
+	struct restart_block    restart_block;
+
+	__u8			supervisor_stack[0];
+};
+
+#else /* !__ASSEMBLY__ */
+
+#ifndef __ASM_OFFSETS_H__
+#include <asm/asm-offsets.h>
+#endif
+
+#endif
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ *
+ * preempt_count needs to be 1 initially, until the scheduler is functional.
+ */
+#ifndef __ASSEMBLY__
+
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task		= &tsk,			\
+	.exec_domain	= &default_exec_domain,	\
+	.flags		= 0,			\
+	.cpu		= 0,			\
+	.preempt_count	= 1,			\
+	.addr_limit	= KERNEL_DS,		\
+	.restart_block = {			\
+		.fn = do_no_restart_syscall,	\
+	},					\
+}
+
+#define init_thread_info	(init_thread_union.thread_info)
+#define init_stack		(init_thread_union.stack)
+#define init_uregs							\
+	((struct pt_regs *)						\
+	 ((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs)))
+
+extern struct thread_info *__current_ti;
+
+/* how to get the thread information struct from C */
+static inline __attribute__((const))
+struct thread_info *current_thread_info(void)
+{
+	struct thread_info *ti;
+	asm("mov sp,%0\n"
+	    "and %1,%0\n"
+	    : "=d" (ti)
+	    : "i" (~(THREAD_SIZE - 1))
+	    : "cc");
+	return ti;
+}
+
+/* how to get the current stack pointer from C */
+static inline unsigned long current_stack_pointer(void)
+{
+	unsigned long sp;
+	asm("mov sp,%0; ":"=r" (sp));
+	return sp;
+}
+
+/* thread information allocation */
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL)
+#else
+#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
+#endif
+
+#define free_thread_info(ti)	kfree((ti))
+#define get_thread_info(ti)	get_task_struct((ti)->task)
+#define put_thread_info(ti)	put_task_struct((ti)->task)
+
+#else /* !__ASSEMBLY__ */
+
+#ifndef __VMLINUX_LDS__
+/* how to get the thread information struct from ASM */
+.macro GET_THREAD_INFO reg
+	mov	sp,\reg
+	and	-THREAD_SIZE,\reg
+.endm
+#endif
+#endif
+
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files may need to
+ *   access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ */
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
+#define TIF_SIGPENDING		2	/* signal pending */
+#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
+#define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
+#define TIF_RESTORE_SIGMASK	5	/* restore signal mask in do_signal() */
+#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_MEMDIE		17	/* OOM killer killed process */
+#define TIF_FREEZE		18	/* freezing for suspend */
+
+#define _TIF_SYSCALL_TRACE	+(1 << TIF_SYSCALL_TRACE)
+#define _TIF_NOTIFY_RESUME	+(1 << TIF_NOTIFY_RESUME)
+#define _TIF_SIGPENDING		+(1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED	+(1 << TIF_NEED_RESCHED)
+#define _TIF_SINGLESTEP		+(1 << TIF_SINGLESTEP)
+#define _TIF_RESTORE_SIGMASK	+(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_POLLING_NRFLAG	+(1 << TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE		+(1 << TIF_FREEZE)
+
+#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
+#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_THREAD_INFO_H */