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, 237 insertions, 0 deletions

diff --git a/include/asm-mn10300/system.h b/include/asm-mn10300/system.h
new file mode 100644
index 00000000000..8214fb7e7fe
--- /dev/null
+++ b/include/asm-mn10300/system.h
@@ -0,0 +1,237 @@
+/* MN10300 System definitions
+ *
+ * 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_SYSTEM_H
+#define _ASM_SYSTEM_H
+
+#include <asm/cpu-regs.h>
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+
+#include <linux/kernel.h>
+
+struct task_struct;
+struct thread_struct;
+
+extern asmlinkage
+struct task_struct *__switch_to(struct thread_struct *prev,
+				struct thread_struct *next,
+				struct task_struct *prev_task);
+
+/* context switching is now performed out-of-line in switch_to.S */
+#define switch_to(prev, next, last)					\
+do {									\
+	current->thread.wchan = (u_long) __builtin_return_address(0);	\
+	(last) = __switch_to(&(prev)->thread, &(next)->thread, (prev));	\
+	mb();								\
+	current->thread.wchan = 0;					\
+} while (0)
+
+#define arch_align_stack(x) (x)
+
+#define nop() asm volatile ("nop")
+
+#endif /* !__ASSEMBLY__ */
+
+/*
+ * Force strict CPU ordering.
+ * And yes, this is required on UP too when we're talking
+ * to devices.
+ *
+ * For now, "wmb()" doesn't actually do anything, as all
+ * Intel CPU's follow what Intel calls a *Processor Order*,
+ * in which all writes are seen in the program order even
+ * outside the CPU.
+ *
+ * I expect future Intel CPU's to have a weaker ordering,
+ * but I'd also expect them to finally get their act together
+ * and add some real memory barriers if so.
+ *
+ * Some non intel clones support out of order store. wmb() ceases to be a
+ * nop for these.
+ */
+
+#define mb()	asm volatile ("": : :"memory")
+#define rmb()	mb()
+#define wmb()	asm volatile ("": : :"memory")
+
+#ifdef CONFIG_SMP
+#define smp_mb()	mb()
+#define smp_rmb()	rmb()
+#define smp_wmb()	wmb()
+#else
+#define smp_mb()	barrier()
+#define smp_rmb()	barrier()
+#define smp_wmb()	barrier()
+#endif
+
+#define set_mb(var, value)  do { var = value;  mb(); } while (0)
+#define set_wmb(var, value) do { var = value; wmb(); } while (0)
+
+#define read_barrier_depends()		do {} while (0)
+#define smp_read_barrier_depends()	do {} while (0)
+
+/*****************************************************************************/
+/*
+ * interrupt control
+ * - "disabled": run in IM1/2
+ *   - level 0 - GDB stub
+ *   - level 1 - virtual serial DMA (if present)
+ *   - level 5 - normal interrupt priority
+ *   - level 6 - timer interrupt
+ * - "enabled":  run in IM7
+ */
+#ifdef CONFIG_MN10300_TTYSM
+#define MN10300_CLI_LEVEL	EPSW_IM_2
+#else
+#define MN10300_CLI_LEVEL	EPSW_IM_1
+#endif
+
+#define local_save_flags(x)			\
+do {						\
+	typecheck(unsigned long, x);		\
+	asm volatile(				\
+		"	mov epsw,%0	\n"	\
+		: "=d"(x)			\
+		);				\
+} while (0)
+
+#define local_irq_disable()						\
+do {									\
+	asm volatile(							\
+		"	and %0,epsw	\n"				\
+		"	or %1,epsw	\n"				\
+		"	nop		\n"				\
+		"	nop		\n"				\
+		"	nop		\n"				\
+		:							\
+		: "i"(~EPSW_IM), "i"(EPSW_IE | MN10300_CLI_LEVEL)	\
+		);							\
+} while (0)
+
+#define local_irq_save(x)			\
+do {						\
+	local_save_flags(x);			\
+	local_irq_disable();			\
+} while (0)
+
+/*
+ * we make sure local_irq_enable() doesn't cause priority inversion
+ */
+#ifndef __ASSEMBLY__
+
+extern unsigned long __mn10300_irq_enabled_epsw;
+
+#endif
+
+#define local_irq_enable()						\
+do {									\
+	unsigned long tmp;						\
+									\
+	asm volatile(							\
+		"	mov	epsw,%0		\n"			\
+		"	and	%1,%0		\n"			\
+		"	or	%2,%0		\n"			\
+		"	mov	%0,epsw		\n"			\
+		: "=&d"(tmp)						\
+		: "i"(~EPSW_IM), "r"(__mn10300_irq_enabled_epsw)	\
+		);							\
+} while (0)
+
+#define local_irq_restore(x)			\
+do {						\
+	typecheck(unsigned long, x);		\
+	asm volatile(				\
+		"	mov %0,epsw	\n"	\
+		"	nop		\n"	\
+		"	nop		\n"	\
+		"	nop		\n"	\
+		:				\
+		: "d"(x)			\
+		: "memory", "cc"		\
+		);				\
+} while (0)
+
+#define irqs_disabled()				\
+({						\
+	unsigned long flags;			\
+	local_save_flags(flags);		\
+	(flags & EPSW_IM) <= MN10300_CLI_LEVEL;	\
+})
+
+/* hook to save power by halting the CPU
+ * - called from the idle loop
+ * - must reenable interrupts (which takes three instruction cycles to complete)
+ */
+#define safe_halt()							\
+do {									\
+	asm volatile("	or	%0,epsw	\n"				\
+		     "	nop		\n"				\
+		     "	nop		\n"				\
+		     "	bset	%2,(%1)	\n"				\
+		     :							\
+		     : "i"(EPSW_IE|EPSW_IM), "n"(&CPUM), "i"(CPUM_SLEEP)\
+		     : "cc"						\
+		     );							\
+} while (0)
+
+#define STI	or EPSW_IE|EPSW_IM,epsw
+#define CLI	and ~EPSW_IM,epsw; or EPSW_IE|MN10300_CLI_LEVEL,epsw; nop; nop; nop
+
+/*****************************************************************************/
+/*
+ * MN10300 doesn't actually have an exchange instruction
+ */
+#ifndef __ASSEMBLY__
+
+struct __xchg_dummy { unsigned long a[100]; };
+#define __xg(x) ((struct __xchg_dummy *)(x))
+
+static inline
+unsigned long __xchg(volatile unsigned long *m, unsigned long val)
+{
+	unsigned long retval;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	retval = *m;
+	*m = val;
+	local_irq_restore(flags);
+	return retval;
+}
+
+#define xchg(ptr, v)						\
+	((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr),	\
+				     (unsigned long)(v)))
+
+static inline unsigned long __cmpxchg(volatile unsigned long *m,
+				      unsigned long old, unsigned long new)
+{
+	unsigned long retval;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	retval = *m;
+	if (retval == old)
+		*m = new;
+	local_irq_restore(flags);
+	return retval;
+}
+
+#define cmpxchg(ptr, o, n)					\
+	((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
+					(unsigned long)(o),	\
+					(unsigned long)(n)))
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_SYSTEM_H */