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, 255 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/head.S b/arch/mn10300/kernel/head.S
new file mode 100644
index 00000000000..606bd8c6758
--- /dev/null
+++ b/arch/mn10300/kernel/head.S
@@ -0,0 +1,255 @@
+/* Boot entry point for MN10300 kernel
+ *
+ * Copyright (C) 2005 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.
+ */
+
+#include <linux/threads.h>
+#include <linux/linkage.h>
+#include <linux/serial_reg.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/frame.inc>
+#include <asm/param.h>
+#include <asm/unit/serial.h>
+
+	.section .text.head,"ax"
+
+###############################################################################
+#
+# bootloader entry point
+#
+###############################################################################
+	.globl	_start
+	.type	_start,@function
+_start:
+	# save commandline pointer
+	mov	d0,a3
+
+	# preload the PGD pointer register
+	mov	swapper_pg_dir,d0
+	mov	d0,(PTBR)
+
+	# turn on the TLBs
+	mov	MMUCTR_IIV|MMUCTR_DIV,d0
+	mov	d0,(MMUCTR)
+	mov	MMUCTR_ITE|MMUCTR_DTE|MMUCTR_CE,d0
+	mov	d0,(MMUCTR)
+
+	# turn on AM33v2 exception handling mode and set the trap table base
+	movhu	(CPUP),d0
+	or	CPUP_EXM_AM33V2,d0
+	movhu	d0,(CPUP)
+	mov	CONFIG_INTERRUPT_VECTOR_BASE,d0
+	mov	d0,(TBR)
+
+	# invalidate and enable both of the caches
+	mov	CHCTR,a0
+	clr	d0
+	movhu	d0,(a0)					# turn off first
+	mov	CHCTR_ICINV|CHCTR_DCINV,d0
+	movhu	d0,(a0)
+	setlb
+	mov	(a0),d0
+	btst	CHCTR_ICBUSY|CHCTR_DCBUSY,d0		# wait till not busy
+	lne
+
+#ifndef CONFIG_MN10300_CACHE_DISABLED
+#ifdef CONFIG_MN10300_CACHE_WBACK
+#ifndef CONFIG_MN10300_CACHE_WBACK_NOWRALLOC
+	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK,d0
+#else
+	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK|CHCTR_DCALMD,d0
+#endif /* CACHE_DISABLED */
+#else
+	mov	CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRTHROUGH,d0
+#endif /* WBACK */
+	movhu	d0,(a0)					# enable
+#endif /* NOWRALLOC */
+
+	# turn on RTS on the debug serial port if applicable
+#ifdef CONFIG_MN10300_UNIT_ASB2305
+	bset	UART_MCR_RTS,(ASB2305_DEBUG_MCR)
+#endif
+
+	# clear the BSS area
+	mov	__bss_start,a0
+	mov	__bss_stop,a1
+	clr	d0
+bssclear:
+	cmp	a1,a0
+	bge	bssclear_end
+	mov	d0,(a0)
+	inc4	a0
+	bra	bssclear
+bssclear_end:
+
+	# retrieve the parameters (including command line) before we overwrite
+	# them
+	cmp	0xabadcafe,d1
+	bne	__no_parameters
+
+__copy_parameters:
+	mov	redboot_command_line,a0
+	mov	a0,a1
+	add	COMMAND_LINE_SIZE,a1
+1:
+	movbu	(a3),d0
+	inc	a3
+	movbu	d0,(a0)
+	inc	a0
+	cmp	a1,a0
+	blt	1b
+
+	mov	redboot_platform_name,a0
+	mov	a0,a1
+	add	COMMAND_LINE_SIZE,a1
+	mov	d2,a3
+1:
+	movbu	(a3),d0
+	inc	a3
+	movbu	d0,(a0)
+	inc	a0
+	cmp	a1,a0
+	blt	1b
+
+__no_parameters:
+
+	# set up the registers with recognisable rubbish in them
+	mov	init_thread_union+THREAD_SIZE-12,sp
+
+	mov	0xea01eaea,d0
+	mov	d0,(4,sp)		# EPSW save area
+	mov	0xea02eaea,d0
+	mov	d0,(8,sp)		# PC save area
+
+	mov	0xeb0060ed,d0
+	mov	d0,mdr
+	mov	0xeb0061ed,d0
+	mov	d0,mdrq
+	mov	0xeb0062ed,d0
+	mov	d0,mcrh
+	mov	0xeb0063ed,d0
+	mov	d0,mcrl
+	mov	0xeb0064ed,d0
+	mov	d0,mcvf
+	mov	0xed0065ed,a3
+	mov	a3,usp
+
+	mov	0xed00e0ed,e0
+	mov	0xed00e1ed,e1
+	mov	0xed00e2ed,e2
+	mov	0xed00e3ed,e3
+	mov	0xed00e4ed,e4
+	mov	0xed00e5ed,e5
+	mov	0xed00e6ed,e6
+	mov	0xed00e7ed,e7
+
+	mov	0xed00d0ed,d0
+	mov	0xed00d1ed,d1
+	mov	0xed00d2ed,d2
+	mov	0xed00d3ed,d3
+	mov	0xed00a0ed,a0
+	mov	0xed00a1ed,a1
+	mov	0xed00a2ed,a2
+	mov	0,a3
+
+	# set up the initial kernel stack
+	SAVE_ALL
+	mov	0xffffffff,d0
+	mov	d0,(REG_ORIG_D0,fp)
+
+	# put different recognisable rubbish in the regs
+	mov	0xfb0060ed,d0
+	mov	d0,mdr
+	mov	0xfb0061ed,d0
+	mov	d0,mdrq
+	mov	0xfb0062ed,d0
+	mov	d0,mcrh
+	mov	0xfb0063ed,d0
+	mov	d0,mcrl
+	mov	0xfb0064ed,d0
+	mov	d0,mcvf
+	mov	0xfd0065ed,a0
+	mov	a0,usp
+
+	mov	0xfd00e0ed,e0
+	mov	0xfd00e1ed,e1
+	mov	0xfd00e2ed,e2
+	mov	0xfd00e3ed,e3
+	mov	0xfd00e4ed,e4
+	mov	0xfd00e5ed,e5
+	mov	0xfd00e6ed,e6
+	mov	0xfd00e7ed,e7
+
+	mov	0xfd00d0ed,d0
+	mov	0xfd00d1ed,d1
+	mov	0xfd00d2ed,d2
+	mov	0xfd00d3ed,d3
+	mov	0xfd00a0ed,a0
+	mov	0xfd00a1ed,a1
+	mov	0xfd00a2ed,a2
+
+	# we may be holding current in E2
+#ifdef CONFIG_MN10300_CURRENT_IN_E2
+	mov	init_task,e2
+#endif
+
+	# initialise the processor and the unit
+	call	processor_init[],0
+	call	unit_init[],0
+
+#ifdef CONFIG_GDBSTUB
+	call	gdbstub_init[],0
+
+#ifdef CONFIG_GDBSTUB_IMMEDIATE
+	.globl	__gdbstub_pause
+__gdbstub_pause:
+	bra	__gdbstub_pause
+#endif
+#endif
+
+	jmp	start_kernel
+	.size	_start, _start-.
+ENTRY(__head_end)
+
+/*
+ * This is initialized to disallow all access to the low 2G region
+ * - the high 2G region is managed directly by the MMU
+ * - range 0x70000000-0x7C000000 are initialised for use by VMALLOC
+ */
+	.section .bss
+	.balign PAGE_SIZE
+ENTRY(swapper_pg_dir)
+        .space PTRS_PER_PGD*4
+
+/*
+ * The page tables are initialized to only 8MB here - the final page
+ * tables are set up later depending on memory size.
+ */
+
+	.balign PAGE_SIZE
+ENTRY(empty_zero_page)
+	.space PAGE_SIZE
+
+	.balign PAGE_SIZE
+ENTRY(empty_bad_page)
+	.space PAGE_SIZE
+
+	.balign PAGE_SIZE
+ENTRY(empty_bad_pte_table)
+	.space PAGE_SIZE
+
+	.balign PAGE_SIZE
+ENTRY(large_page_table)
+	.space PAGE_SIZE
+
+	.balign PAGE_SIZE
+ENTRY(kernel_vmalloc_ptes)
+	.space ((VMALLOC_END-VMALLOC_START)/PAGE_SIZE)*4