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 000000000000..606bd8c6758d
--- /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