6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
865 lines
28 KiB
ArmAsm
865 lines
28 KiB
ArmAsm
/* $Id: head.S,v 1.10 2005/06/20 05:12:54 starvik Exp $
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*
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* Head of the kernel - alter with care
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*
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* Copyright (C) 2000, 2001 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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* $Log: head.S,v $
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* Revision 1.10 2005/06/20 05:12:54 starvik
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* Remove unnecessary diff to kernel.org tree
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*
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* Revision 1.9 2004/12/13 12:21:51 starvik
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* Added I/O and DMA allocators from Linux 2.4
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*
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* Revision 1.8 2004/11/22 11:41:14 starvik
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* Kernel command line may be supplied to kernel. Not used by Axis but may
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* be used by customers.
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*
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* Revision 1.7 2004/05/14 07:58:01 starvik
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* Merge of changes from 2.4
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*
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* Revision 1.6 2003/04/28 05:31:46 starvik
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* Added section attributes
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*
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* Revision 1.5 2002/12/11 15:42:02 starvik
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* Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/*.c
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*
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* Revision 1.4 2002/11/07 09:00:44 starvik
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* Names changed for init sections
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* init_task_union -> init_thread_union
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*
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* Revision 1.3 2002/02/05 15:38:23 bjornw
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* Oops.. non-CRAMFS_MAGIC should jump over the copying, not into it...
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*
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* Revision 1.2 2001/12/18 13:35:19 bjornw
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* Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
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*
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* Revision 1.43 2001/11/08 15:09:43 starvik
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* Only start MII clock if Ethernet is configured
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*
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* Revision 1.42 2001/11/08 14:37:34 starvik
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* Start MII clock early to make sure that it is running at tranceiver reset
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*
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* Revision 1.41 2001/10/29 14:55:58 pkj
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* Corrected pa$r0 to par0.
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*
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* Revision 1.40 2001/10/03 14:59:57 pkj
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* Added support for resetting the Bluetooth hardware.
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*
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* Revision 1.39 2001/10/01 14:45:03 bjornw
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* Removed underscores and added register prefixes
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*
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* Revision 1.38 2001/09/21 07:14:11 jonashg
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* Made root filesystem (cramfs) use mtdblock driver when booting from flash.
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*
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* Revision 1.37 2001/09/11 13:44:29 orjanf
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* Decouple usage of serial ports for debug and kgdb.
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*
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* Revision 1.36 2001/06/29 12:39:31 pkj
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* Added support for mirroring the first flash to just below the
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* second one, to make them look consecutive to cramfs.
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*
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* Revision 1.35 2001/06/25 14:07:00 hp
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* Fix review comment.
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* * head.S: Use IO_STATE, IO_FIELD and IO_MASK constructs instead of
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* magic numbers. Add comment that -traditional must not be used.
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* * entry.S (SYMBOL_NAME): Change redefinition to use ## concatenation.
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* Correct and update comment.
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* * Makefile (.S.o): Don't use -traditional. Add comment why the
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* toplevel rule can't be used (now that there's a reason).
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*
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* Revision 1.34 2001/05/15 07:08:14 hp
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* Tweak "notice" to reflect that both r8 r9 are used
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*
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* Revision 1.33 2001/05/15 06:40:05 hp
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* Put bulk of code in .text.init, data in .data.init
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*
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* Revision 1.32 2001/05/15 06:18:56 hp
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* Execute review comment: s/bcc/bhs/g; s/bcs/blo/g
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*
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* Revision 1.31 2001/05/15 06:08:40 hp
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* Add sentence about autodetecting the bit31-MMU-bug
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*
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* Revision 1.30 2001/05/15 06:00:05 hp
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* Update comment: LOW_MAP is not forced on xsim anymore.
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*
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* Revision 1.29 2001/04/18 12:51:59 orjanf
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* * Reverted review change regarding the use of bcs/bcc.
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* * Removed non-working LED-clearing code.
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*
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* Revision 1.28 2001/04/17 13:58:39 orjanf
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* * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB.
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*
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* Revision 1.27 2001/04/17 11:42:35 orjanf
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* Changed according to review:
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* * Added comment explaining memory map bug.
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* * Changed bcs and bcc to blo and bhs, respectively.
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* * Removed mentioning of Stallone and Olga boards.
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*
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* Revision 1.26 2001/04/06 12:31:07 jonashg
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* Check for cramfs in flash before RAM instead of RAM before flash.
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*
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* Revision 1.25 2001/04/04 06:23:53 starvik
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* Initialize DRAM if not already initialized
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*
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* Revision 1.24 2001/04/03 11:12:00 starvik
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* Removed dram init (done by rescue or etrax100boot
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* Corrected include
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*
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* Revision 1.23 2001/04/03 09:53:03 starvik
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* Include hw_settings.S
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*
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* Revision 1.22 2001/03/26 14:23:26 bjornw
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* Namechange of some config options
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*
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* Revision 1.21 2001/03/08 12:14:41 bjornw
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* * Config name for ETRAX IDE was renamed
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* * Removed G27 auto-setting when JULIETTE is chosen (need to make this
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* a new config option later)
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*
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* Revision 1.20 2001/02/23 12:47:56 bjornw
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* MMU regs during LOW_MAP updated to reflect a newer reality
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*
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* Revision 1.19 2001/02/19 11:12:07 bjornw
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* Changed comment header format
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*
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* Revision 1.18 2001/02/15 07:25:38 starvik
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* Added support for synchronous serial ports
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*
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* Revision 1.17 2001/02/08 15:53:13 starvik
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* Last commit removed some important ifdefs
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*
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* Revision 1.16 2001/02/08 15:20:38 starvik
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* Include dram_init.S as inline
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*
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* Revision 1.15 2001/01/29 18:12:01 bjornw
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* Corrected some comments
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*
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* Revision 1.14 2001/01/29 13:11:29 starvik
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* Include dram_init.S (with DRAM/SDRAM initialization)
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*
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* Revision 1.13 2001/01/23 14:54:57 markusl
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* Updated for USB
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* i.e. added r_gen_config settings
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*
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* Revision 1.12 2001/01/19 16:16:29 perf
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* Added temporary mapping of 0x0c->0x0c to avoid flash loading confusion.
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* Renamed serial options from ETRAX100 to ETRAX.
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*
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* Revision 1.11 2001/01/16 16:31:38 bjornw
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* * Changed name and semantics of running_from_flash to romfs_in_flash,
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* set by head.S to indicate to setup.c whether there is a cramfs image
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* after the kernels BSS or not. Should work for all three boot-cases
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* (DRAM with cramfs in DRAM, DRAM with cramfs in flash (compressed boot),
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* and flash with cramfs in flash)
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*
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* Revision 1.10 2001/01/16 14:12:21 bjornw
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* * Check for cramfs start passed in r9 from the decompressor, if all other
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* cramfs options fail (if we boot from DRAM but don't find a cramfs image
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* after the kernel in DRAM, it is probably still in the flash)
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* * Check magic in cramfs detection when booting from flash directly
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*
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* Revision 1.9 2001/01/15 17:17:02 bjornw
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* * Corrected the code that detects the cramfs lengths
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* * Added a comment saying that the above does not work due to other
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* reasons..
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*
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* Revision 1.8 2001/01/15 16:27:51 jonashg
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* Made boot after flashing work.
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* * end destination is __vmlinux_end in RAM.
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* * _romfs_start moved because of virtual memory.
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*
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* Revision 1.7 2000/11/21 13:55:29 bjornw
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* Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type
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*
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* Revision 1.6 2000/10/06 12:36:55 bjornw
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* Forgot swapper_pg_dir when changing memory map..
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*
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* Revision 1.5 2000/10/04 16:49:30 bjornw
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* * Fixed memory mapping in LX
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* * Check for cramfs instead of romfs
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*
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*/
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#define ASSEMBLER_MACROS_ONLY
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/* The IO_* macros use the ## token concatenation operator, so
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-traditional must not be used when assembling this file. */
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#include <asm/arch/sv_addr_ag.h>
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#define CRAMFS_MAGIC 0x28cd3d45
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#define RAM_INIT_MAGIC 0x56902387
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#define COMMAND_LINE_MAGIC 0x87109563
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#define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\
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IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk)
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;; exported symbols
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.globl etrax_irv
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.globl romfs_start
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.globl romfs_length
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.globl romfs_in_flash
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.globl swapper_pg_dir
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.text
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;; This is the entry point of the kernel. We are in supervisor mode.
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;; 0x00000000 if Flash, 0x40004000 if DRAM
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;; since etrax actually starts at address 2 when booting from flash, we
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;; put a nop (2 bytes) here first so we dont accidentally skip the di
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;;
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;; NOTICE! The registers r8 and r9 are used as parameters carrying
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;; information from the decompressor (if the kernel was compressed).
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;; They should not be used in the code below until read.
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nop
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di
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;; First setup the kseg_c mapping from where the kernel is linked
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;; to 0x40000000 (where the actual DRAM resides) otherwise
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;; we cannot do very much! See arch/cris/README.mm
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;;
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;; Notice that since we're potentially running at 0x00 or 0x40 right now,
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;; we will get a fault as soon as we enable the MMU if we dont
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;; temporarily map those segments linearily.
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;;
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;; Due to a bug in Etrax-100 LX version 1 we need to map the memory
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;; slightly different. The bug is that you can't remap bit 31 of
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;; an address. Though we can check the version register for
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;; whether the bug is present, some constants would then have to
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;; be variables, so we don't. The drawback is that you can "only" map
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;; 1G per process with CONFIG_CRIS_LOW_MAP.
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#ifdef CONFIG_CRIS_LOW_MAP
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; kseg mappings, temporary map of 0xc0->0x40
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move.d IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \
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| IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb) \
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| IO_FIELD (R_MMU_KBASE_HI, base_9, 9) \
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| IO_FIELD (R_MMU_KBASE_HI, base_8, 8), $r0
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move.d $r0, [R_MMU_KBASE_HI]
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; temporary map of 0x40->0x40 and 0x60->0x40
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move.d IO_FIELD (R_MMU_KBASE_LO, base_6, 4) \
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| IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0
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move.d $r0, [R_MMU_KBASE_LO]
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; mmu enable, segs e,c,b,a,6,5,4,0 segment mapped
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move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \
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| IO_STATE (R_MMU_CONFIG, inv_excp, enable) \
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| IO_STATE (R_MMU_CONFIG, acc_excp, enable) \
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| IO_STATE (R_MMU_CONFIG, we_excp, enable) \
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| IO_STATE (R_MMU_CONFIG, seg_f, page) \
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| IO_STATE (R_MMU_CONFIG, seg_e, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_d, page) \
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| IO_STATE (R_MMU_CONFIG, seg_c, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_b, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_a, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_9, page) \
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| IO_STATE (R_MMU_CONFIG, seg_8, page) \
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| IO_STATE (R_MMU_CONFIG, seg_7, page) \
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| IO_STATE (R_MMU_CONFIG, seg_6, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_5, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_4, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_3, page) \
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| IO_STATE (R_MMU_CONFIG, seg_2, page) \
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| IO_STATE (R_MMU_CONFIG, seg_1, page) \
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| IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0
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move.d $r0, [R_MMU_CONFIG]
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#else
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; kseg mappings
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move.d IO_FIELD (R_MMU_KBASE_HI, base_e, 8) \
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| IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \
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| IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb), $r0
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move.d $r0, [R_MMU_KBASE_HI]
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; temporary map of 0x40->0x40 and 0x00->0x00
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move.d IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0
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move.d $r0, [R_MMU_KBASE_LO]
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; mmu enable, segs f,e,c,b,4,0 segment mapped
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move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \
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| IO_STATE (R_MMU_CONFIG, inv_excp, enable) \
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| IO_STATE (R_MMU_CONFIG, acc_excp, enable) \
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| IO_STATE (R_MMU_CONFIG, we_excp, enable) \
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| IO_STATE (R_MMU_CONFIG, seg_f, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_e, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_d, page) \
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| IO_STATE (R_MMU_CONFIG, seg_c, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_b, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_a, page) \
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| IO_STATE (R_MMU_CONFIG, seg_9, page) \
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| IO_STATE (R_MMU_CONFIG, seg_8, page) \
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| IO_STATE (R_MMU_CONFIG, seg_7, page) \
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| IO_STATE (R_MMU_CONFIG, seg_6, page) \
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| IO_STATE (R_MMU_CONFIG, seg_5, page) \
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| IO_STATE (R_MMU_CONFIG, seg_4, seg) \
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| IO_STATE (R_MMU_CONFIG, seg_3, page) \
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| IO_STATE (R_MMU_CONFIG, seg_2, page) \
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| IO_STATE (R_MMU_CONFIG, seg_1, page) \
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| IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0
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move.d $r0, [R_MMU_CONFIG]
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#endif
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;; Now we need to sort out the segments and their locations in RAM or
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;; Flash. The image in the Flash (or in DRAM) consists of 3 pieces:
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;; 1) kernel text, 2) kernel data, 3) ROM filesystem image
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;; But the linker has linked the kernel to expect this layout in
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;; DRAM memory:
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;; 1) kernel text, 2) kernel data, 3) kernel BSS
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;; (the location of the ROM filesystem is determined by the krom driver)
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;; If we boot this from Flash, we want to keep the ROM filesystem in
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;; the flash, we want to copy the text and need to copy the data to DRAM.
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;; But if we boot from DRAM, we need to move the ROMFS image
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;; from its position after kernel data, to after kernel BSS, BEFORE the
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;; kernel starts using the BSS area (since its "overlayed" with the ROMFS)
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;;
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;; In both cases, we start in un-cached mode, and need to jump into a
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;; cached PC after we're done fiddling around with the segments.
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;;
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;; arch/etrax100/etrax100.ld sets some symbols that define the start
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;; and end of each segment.
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;; Check if we start from DRAM or FLASH by testing PC
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move.d $pc,$r0
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and.d 0x7fffffff,$r0 ; get rid of the non-cache bit
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cmp.d 0x10000,$r0 ; arbitrary... just something above this code
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blo _inflash0
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nop
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jump _inram ; enter cached ram
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;; Jumpgate for branches.
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_inflash0:
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jump _inflash
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;; Put this in a suitable section where we can reclaim storage
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;; after init.
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.section ".init.text", "ax"
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_inflash:
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#ifdef CONFIG_ETRAX_ETHERNET
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;; Start MII clock to make sure it is running when tranceiver is reset
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move.d START_ETHERNET_CLOCK, $r0
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move.d $r0, [R_NETWORK_GEN_CONFIG]
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#endif
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;; Set up waitstates etc according to kernel configuration.
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#ifndef CONFIG_SVINTO_SIM
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move.d CONFIG_ETRAX_DEF_R_WAITSTATES, $r0
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move.d $r0, [R_WAITSTATES]
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move.d CONFIG_ETRAX_DEF_R_BUS_CONFIG, $r0
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move.d $r0, [R_BUS_CONFIG]
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#endif
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;; We need to initialze DRAM registers before we start using the DRAM
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cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
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beq _dram_init_finished
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nop
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#include "../lib/dram_init.S"
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_dram_init_finished:
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;; Copy text+data to DRAM
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;; This is fragile - the calculation of r4 as the image size depends
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;; on that the labels below actually are the first and last positions
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;; in the linker-script.
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;;
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;; Then the locating of the cramfs image depends on the aforementioned
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;; image being located in the flash at 0. This is most often not true,
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;; thus the following does not work (normally there is a rescue-block
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;; between the physical start of the flash and the flash-image start,
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;; and when run with compression, the kernel is actually unpacked to
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;; DRAM and we never get here in the first place :))
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moveq 0, $r0 ; source
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move.d text_start, $r1 ; destination
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move.d __vmlinux_end, $r2 ; end destination
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move.d $r2, $r4
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sub.d $r1, $r4 ; r4=__vmlinux_end in flash, used below
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1: move.w [$r0+], $r3
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move.w $r3, [$r1+]
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cmp.d $r2, $r1
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blo 1b
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nop
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;; We keep the cramfs in the flash.
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;; There might be none, but that does not matter because
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;; we don't do anything than read some bytes here.
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moveq 0, $r0
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move.d $r0, [romfs_length] ; default if there is no cramfs
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move.d [$r4], $r0 ; cramfs_super.magic
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cmp.d CRAMFS_MAGIC, $r0
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bne 1f
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nop
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move.d [$r4 + 4], $r0 ; cramfs_super.size
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move.d $r0, [romfs_length]
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#ifdef CONFIG_CRIS_LOW_MAP
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add.d 0x50000000, $r4 ; add flash start in virtual memory (cached)
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#else
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add.d 0xf0000000, $r4 ; add flash start in virtual memory (cached)
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#endif
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move.d $r4, [romfs_start]
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1:
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moveq 1, $r0
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move.d $r0, [romfs_in_flash]
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jump _start_it ; enter code, cached this time
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_inram:
|
|
;; Move the ROM fs to after BSS end. This assumes that the cramfs
|
|
;; second longword contains the length of the cramfs
|
|
|
|
moveq 0, $r0
|
|
move.d $r0, [romfs_length] ; default if there is no cramfs
|
|
|
|
;; The kernel could have been unpacked to DRAM by the loader, but
|
|
;; the cramfs image could still be in the Flash directly after the
|
|
;; compressed kernel image. The loader passes the address of the
|
|
;; byte succeeding the last compressed byte in the flash in the
|
|
;; register r9 when starting the kernel. Check if r9 points to a
|
|
;; decent cramfs image!
|
|
;; (Notice that if this is not booted from the loader, r9 will be
|
|
;; garbage but we do sanity checks on it, the chance that it points
|
|
;; to a cramfs magic is small.. )
|
|
|
|
cmp.d 0x0ffffff8, $r9
|
|
bhs _no_romfs_in_flash ; r9 points outside the flash area
|
|
nop
|
|
move.d [$r9], $r0 ; cramfs_super.magic
|
|
cmp.d CRAMFS_MAGIC, $r0
|
|
bne _no_romfs_in_flash
|
|
nop
|
|
move.d [$r9+4], $r0 ; cramfs_super.length
|
|
move.d $r0, [romfs_length]
|
|
#ifdef CONFIG_CRIS_LOW_MAP
|
|
add.d 0x50000000, $r9 ; add flash start in virtual memory (cached)
|
|
#else
|
|
add.d 0xf0000000, $r9 ; add flash start in virtual memory (cached)
|
|
#endif
|
|
move.d $r9, [romfs_start]
|
|
|
|
moveq 1, $r0
|
|
move.d $r0, [romfs_in_flash]
|
|
|
|
jump _start_it ; enter code, cached this time
|
|
|
|
_no_romfs_in_flash:
|
|
|
|
;; Check if there is a cramfs (magic value).
|
|
;; Notice that we check for cramfs magic value - which is
|
|
;; the "rom fs" we'll possibly use in 2.4 if not JFFS (which does
|
|
;; not need this mechanism anyway)
|
|
|
|
move.d __vmlinux_end, $r0; the image will be after the vmlinux end address
|
|
move.d [$r0], $r1 ; cramfs assumes same endian on host/target
|
|
cmp.d CRAMFS_MAGIC, $r1; magic value in cramfs superblock
|
|
bne 2f
|
|
nop
|
|
|
|
;; Ok. What is its size ?
|
|
|
|
move.d [$r0 + 4], $r2 ; cramfs_super.size (again, no need to swapwb)
|
|
|
|
;; We want to copy it to the end of the BSS
|
|
|
|
move.d _end, $r1
|
|
|
|
;; Remember values so cramfs and setup can find this info
|
|
|
|
move.d $r1, [romfs_start] ; new romfs location
|
|
move.d $r2, [romfs_length]
|
|
|
|
;; We need to copy it backwards, since they can be overlapping
|
|
|
|
add.d $r2, $r0
|
|
add.d $r2, $r1
|
|
|
|
;; Go ahead. Make my loop.
|
|
|
|
lsrq 1, $r2 ; size is in bytes, we copy words
|
|
|
|
1: move.w [$r0=$r0-2],$r3
|
|
move.w $r3,[$r1=$r1-2]
|
|
subq 1, $r2
|
|
bne 1b
|
|
nop
|
|
|
|
2:
|
|
;; Dont worry that the BSS is tainted. It will be cleared later.
|
|
|
|
moveq 0, $r0
|
|
move.d $r0, [romfs_in_flash]
|
|
|
|
jump _start_it ; better skip the additional cramfs check below
|
|
|
|
_start_it:
|
|
|
|
;; Check if kernel command line is supplied
|
|
cmp.d COMMAND_LINE_MAGIC, $r10
|
|
bne no_command_line
|
|
nop
|
|
|
|
move.d 256, $r13
|
|
move.d cris_command_line, $r10
|
|
or.d 0x80000000, $r11 ; Make it virtual
|
|
1:
|
|
move.b [$r11+], $r12
|
|
move.b $r12, [$r10+]
|
|
subq 1, $r13
|
|
bne 1b
|
|
nop
|
|
|
|
no_command_line:
|
|
|
|
;; the kernel stack is overlayed with the task structure for each
|
|
;; task. thus the initial kernel stack is in the same page as the
|
|
;; init_task (but starts in the top of the page, size 8192)
|
|
move.d init_thread_union + 8192, $sp
|
|
move.d ibr_start,$r0 ; this symbol is set by the linker script
|
|
move $r0,$ibr
|
|
move.d $r0,[etrax_irv] ; set the interrupt base register and pointer
|
|
|
|
;; Clear BSS region, from _bss_start to _end
|
|
|
|
move.d __bss_start, $r0
|
|
move.d _end, $r1
|
|
1: clear.d [$r0+]
|
|
cmp.d $r1, $r0
|
|
blo 1b
|
|
nop
|
|
|
|
#ifdef CONFIG_BLK_DEV_ETRAXIDE
|
|
;; disable ATA before enabling it in genconfig below
|
|
moveq 0,$r0
|
|
move.d $r0,[R_ATA_CTRL_DATA]
|
|
move.d $r0,[R_ATA_TRANSFER_CNT]
|
|
move.d $r0,[R_ATA_CONFIG]
|
|
#if 0
|
|
move.d R_PORT_G_DATA, $r1
|
|
move.d $r0, [$r1]; assert ATA bus-reset
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
move.d 0x08000000,$r0
|
|
move.d $r0,[$r1]
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_JULIETTE
|
|
;; configure external DMA channel 0 before enabling it in genconfig
|
|
|
|
moveq 0,$r0
|
|
move.d $r0,[R_EXT_DMA_0_ADDR]
|
|
; cnt enable, word size, output, stop, size 0
|
|
move.d IO_STATE (R_EXT_DMA_0_CMD, cnt, enable) \
|
|
| IO_STATE (R_EXT_DMA_0_CMD, rqpol, ahigh) \
|
|
| IO_STATE (R_EXT_DMA_0_CMD, apol, ahigh) \
|
|
| IO_STATE (R_EXT_DMA_0_CMD, rq_ack, burst) \
|
|
| IO_STATE (R_EXT_DMA_0_CMD, wid, word) \
|
|
| IO_STATE (R_EXT_DMA_0_CMD, dir, output) \
|
|
| IO_STATE (R_EXT_DMA_0_CMD, run, stop) \
|
|
| IO_FIELD (R_EXT_DMA_0_CMD, trf_count, 0),$r0
|
|
move.d $r0,[R_EXT_DMA_0_CMD]
|
|
|
|
;; reset dma4 and wait for completion
|
|
|
|
moveq IO_STATE (R_DMA_CH4_CMD, cmd, reset),$r0
|
|
move.b $r0,[R_DMA_CH4_CMD]
|
|
1: move.b [R_DMA_CH4_CMD],$r0
|
|
and.b IO_MASK (R_DMA_CH4_CMD, cmd),$r0
|
|
cmp.b IO_STATE (R_DMA_CH4_CMD, cmd, reset),$r0
|
|
beq 1b
|
|
nop
|
|
|
|
;; reset dma5 and wait for completion
|
|
|
|
moveq IO_STATE (R_DMA_CH5_CMD, cmd, reset),$r0
|
|
move.b $r0,[R_DMA_CH5_CMD]
|
|
1: move.b [R_DMA_CH5_CMD],$r0
|
|
and.b IO_MASK (R_DMA_CH5_CMD, cmd),$r0
|
|
cmp.b IO_STATE (R_DMA_CH5_CMD, cmd, reset),$r0
|
|
beq 1b
|
|
nop
|
|
#endif
|
|
|
|
;; Etrax product HW genconfig setup
|
|
|
|
moveq 0,$r0
|
|
|
|
;; Init interfaces (disable them).
|
|
or.d IO_STATE (R_GEN_CONFIG, scsi0, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, ata, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, par0, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, ser2, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, mio, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, scsi1, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, scsi0w, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, par1, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, ser3, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, mio_w, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, usb1, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, usb2, disable) \
|
|
| IO_STATE (R_GEN_CONFIG, par_w, disable),$r0
|
|
|
|
;; Init DMA channel muxing (set to unused clients).
|
|
or.d IO_STATE (R_GEN_CONFIG, dma2, ata) \
|
|
| IO_STATE (R_GEN_CONFIG, dma3, ata) \
|
|
| IO_STATE (R_GEN_CONFIG, dma4, scsi1) \
|
|
| IO_STATE (R_GEN_CONFIG, dma5, scsi1) \
|
|
| IO_STATE (R_GEN_CONFIG, dma6, unused) \
|
|
| IO_STATE (R_GEN_CONFIG, dma7, unused) \
|
|
| IO_STATE (R_GEN_CONFIG, dma8, usb) \
|
|
| IO_STATE (R_GEN_CONFIG, dma9, usb),$r0
|
|
|
|
|
|
#if defined(CONFIG_ETRAX_DEF_R_PORT_G0_DIR_OUT)
|
|
or.d IO_STATE (R_GEN_CONFIG, g0dir, out),$r0
|
|
#endif
|
|
|
|
#if defined(CONFIG_ETRAX_DEF_R_PORT_G8_15_DIR_OUT)
|
|
or.d IO_STATE (R_GEN_CONFIG, g8_15dir, out),$r0
|
|
#endif
|
|
#if defined(CONFIG_ETRAX_DEF_R_PORT_G16_23_DIR_OUT)
|
|
or.d IO_STATE (R_GEN_CONFIG, g16_23dir, out),$r0
|
|
#endif
|
|
|
|
#if defined(CONFIG_ETRAX_DEF_R_PORT_G24_DIR_OUT)
|
|
or.d IO_STATE (R_GEN_CONFIG, g24dir, out),$r0
|
|
#endif
|
|
|
|
move.d $r0,[genconfig_shadow] ; init a shadow register of R_GEN_CONFIG
|
|
|
|
#ifndef CONFIG_SVINTO_SIM
|
|
move.d $r0,[R_GEN_CONFIG]
|
|
|
|
#if 0
|
|
moveq 4,$r0
|
|
move.b $r0,[R_DMA_CH6_CMD] ; reset (ser0 dma out)
|
|
move.b $r0,[R_DMA_CH7_CMD] ; reset (ser0 dma in)
|
|
1: move.b [R_DMA_CH6_CMD],$r0 ; wait for reset cycle to finish
|
|
and.b 7,$r0
|
|
cmp.b 4,$r0
|
|
beq 1b
|
|
nop
|
|
1: move.b [R_DMA_CH7_CMD],$r0 ; wait for reset cycle to finish
|
|
and.b 7,$r0
|
|
cmp.b 4,$r0
|
|
beq 1b
|
|
nop
|
|
#endif
|
|
|
|
moveq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0
|
|
move.b $r0,[R_DMA_CH8_CMD] ; reset (ser1 dma out)
|
|
move.b $r0,[R_DMA_CH9_CMD] ; reset (ser1 dma in)
|
|
1: move.b [R_DMA_CH8_CMD],$r0 ; wait for reset cycle to finish
|
|
andq IO_MASK (R_DMA_CH8_CMD, cmd),$r0
|
|
cmpq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0
|
|
beq 1b
|
|
nop
|
|
1: move.b [R_DMA_CH9_CMD],$r0 ; wait for reset cycle to finish
|
|
andq IO_MASK (R_DMA_CH9_CMD, cmd),$r0
|
|
cmpq IO_STATE (R_DMA_CH9_CMD, cmd, reset),$r0
|
|
beq 1b
|
|
nop
|
|
|
|
;; setup port PA and PB default initial directions and data
|
|
;; including their shadow registers
|
|
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR,$r0
|
|
#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PA7)
|
|
or.b IO_STATE (R_PORT_PA_DIR, dir7, output),$r0
|
|
#endif
|
|
move.b $r0,[port_pa_dir_shadow]
|
|
move.b $r0,[R_PORT_PA_DIR]
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA,$r0
|
|
#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PA7)
|
|
#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH)
|
|
and.b ~(1 << 7),$r0
|
|
#else
|
|
or.b (1 << 7),$r0
|
|
#endif
|
|
#endif
|
|
move.b $r0,[port_pa_data_shadow]
|
|
move.b $r0,[R_PORT_PA_DATA]
|
|
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PB_CONFIG,$r0
|
|
move.b $r0,[port_pb_config_shadow]
|
|
move.b $r0,[R_PORT_PB_CONFIG]
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR,$r0
|
|
#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PB5)
|
|
or.b IO_STATE (R_PORT_PB_DIR, dir5, output),$r0
|
|
#endif
|
|
move.b $r0,[port_pb_dir_shadow]
|
|
move.b $r0,[R_PORT_PB_DIR]
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA,$r0
|
|
#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PB5)
|
|
#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH)
|
|
and.b ~(1 << 5),$r0
|
|
#else
|
|
or.b (1 << 5),$r0
|
|
#endif
|
|
#endif
|
|
move.b $r0,[port_pb_data_shadow]
|
|
move.b $r0,[R_PORT_PB_DATA]
|
|
|
|
moveq 0, $r0
|
|
move.d $r0,[port_pb_i2c_shadow]
|
|
move.d $r0, [R_PORT_PB_I2C]
|
|
|
|
moveq 0,$r0
|
|
#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_G10)
|
|
#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH)
|
|
and.d ~(1 << 10),$r0
|
|
#else
|
|
or.d (1 << 10),$r0
|
|
#endif
|
|
#endif
|
|
#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_G11)
|
|
#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH)
|
|
and.d ~(1 << 11),$r0
|
|
#else
|
|
or.d (1 << 11),$r0
|
|
#endif
|
|
#endif
|
|
move.d $r0,[port_g_data_shadow]
|
|
move.d $r0,[R_PORT_G_DATA]
|
|
|
|
;; setup the serial port 0 at 115200 baud for debug purposes
|
|
|
|
moveq IO_STATE (R_SERIAL0_XOFF, tx_stop, enable) \
|
|
| IO_STATE (R_SERIAL0_XOFF, auto_xoff, disable) \
|
|
| IO_FIELD (R_SERIAL0_XOFF, xoff_char, 0),$r0
|
|
move.d $r0,[R_SERIAL0_XOFF]
|
|
|
|
; 115.2kbaud for both transmit and receive
|
|
move.b IO_STATE (R_SERIAL0_BAUD, tr_baud, c115k2Hz) \
|
|
| IO_STATE (R_SERIAL0_BAUD, rec_baud, c115k2Hz),$r0
|
|
move.b $r0,[R_SERIAL0_BAUD]
|
|
|
|
; Set up and enable the serial0 receiver.
|
|
move.b IO_STATE (R_SERIAL0_REC_CTRL, dma_err, stop) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, rec_enable, enable) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, rts_, active) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, sampling, middle) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, rec_stick_par, normal) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, rec_par, even) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, rec_par_en, disable) \
|
|
| IO_STATE (R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit),$r0
|
|
move.b $r0,[R_SERIAL0_REC_CTRL]
|
|
|
|
; Set up and enable the serial0 transmitter.
|
|
move.b IO_FIELD (R_SERIAL0_TR_CTRL, txd, 0) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, tr_enable, enable) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, auto_cts, disabled) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, stop_bits, one_bit) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, tr_stick_par, normal) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, tr_par, even) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, tr_par_en, disable) \
|
|
| IO_STATE (R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit),$r0
|
|
move.b $r0,[R_SERIAL0_TR_CTRL]
|
|
|
|
;; setup the serial port 1 at 115200 baud for debug purposes
|
|
|
|
moveq IO_STATE (R_SERIAL1_XOFF, tx_stop, enable) \
|
|
| IO_STATE (R_SERIAL1_XOFF, auto_xoff, disable) \
|
|
| IO_FIELD (R_SERIAL1_XOFF, xoff_char, 0),$r0
|
|
move.d $r0,[R_SERIAL1_XOFF]
|
|
|
|
; 115.2kbaud for both transmit and receive
|
|
move.b IO_STATE (R_SERIAL1_BAUD, tr_baud, c115k2Hz) \
|
|
| IO_STATE (R_SERIAL1_BAUD, rec_baud, c115k2Hz),$r0
|
|
move.b $r0,[R_SERIAL1_BAUD]
|
|
|
|
; Set up and enable the serial1 receiver.
|
|
move.b IO_STATE (R_SERIAL1_REC_CTRL, dma_err, stop) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, rec_enable, enable) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, rts_, active) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, sampling, middle) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, rec_stick_par, normal) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, rec_par, even) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, rec_par_en, disable) \
|
|
| IO_STATE (R_SERIAL1_REC_CTRL, rec_bitnr, rec_8bit),$r0
|
|
move.b $r0,[R_SERIAL1_REC_CTRL]
|
|
|
|
; Set up and enable the serial1 transmitter.
|
|
move.b IO_FIELD (R_SERIAL1_TR_CTRL, txd, 0) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, tr_enable, enable) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, auto_cts, disabled) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, stop_bits, one_bit) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, tr_stick_par, normal) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, tr_par, even) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, tr_par_en, disable) \
|
|
| IO_STATE (R_SERIAL1_TR_CTRL, tr_bitnr, tr_8bit),$r0
|
|
move.b $r0,[R_SERIAL1_TR_CTRL]
|
|
|
|
|
|
#ifdef CONFIG_ETRAX_SERIAL_PORT3
|
|
;; setup the serial port 3 at 115200 baud for debug purposes
|
|
|
|
moveq IO_STATE (R_SERIAL3_XOFF, tx_stop, enable) \
|
|
| IO_STATE (R_SERIAL3_XOFF, auto_xoff, disable) \
|
|
| IO_FIELD (R_SERIAL3_XOFF, xoff_char, 0),$r0
|
|
move.d $r0,[R_SERIAL3_XOFF]
|
|
|
|
; 115.2kbaud for both transmit and receive
|
|
move.b IO_STATE (R_SERIAL3_BAUD, tr_baud, c115k2Hz) \
|
|
| IO_STATE (R_SERIAL3_BAUD, rec_baud, c115k2Hz),$r0
|
|
move.b $r0,[R_SERIAL3_BAUD]
|
|
|
|
; Set up and enable the serial3 receiver.
|
|
move.b IO_STATE (R_SERIAL3_REC_CTRL, dma_err, stop) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, rec_enable, enable) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, rts_, active) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, sampling, middle) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, rec_stick_par, normal) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, rec_par, even) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, rec_par_en, disable) \
|
|
| IO_STATE (R_SERIAL3_REC_CTRL, rec_bitnr, rec_8bit),$r0
|
|
move.b $r0,[R_SERIAL3_REC_CTRL]
|
|
|
|
; Set up and enable the serial3 transmitter.
|
|
move.b IO_FIELD (R_SERIAL3_TR_CTRL, txd, 0) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, tr_enable, enable) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, auto_cts, disabled) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, stop_bits, one_bit) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, tr_stick_par, normal) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, tr_par, even) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, tr_par_en, disable) \
|
|
| IO_STATE (R_SERIAL3_TR_CTRL, tr_bitnr, tr_8bit),$r0
|
|
move.b $r0,[R_SERIAL3_TR_CTRL]
|
|
#endif
|
|
|
|
#endif /* CONFIG_SVINTO_SIM */
|
|
|
|
jump start_kernel ; jump into the C-function start_kernel in init/main.c
|
|
|
|
.data
|
|
etrax_irv:
|
|
.dword 0
|
|
romfs_start:
|
|
.dword 0
|
|
romfs_length:
|
|
.dword 0
|
|
romfs_in_flash:
|
|
.dword 0
|
|
|
|
;; put some special pages at the beginning of the kernel aligned
|
|
;; to page boundaries - the kernel cannot start until after this
|
|
|
|
#ifdef CONFIG_CRIS_LOW_MAP
|
|
swapper_pg_dir = 0x60002000
|
|
#else
|
|
swapper_pg_dir = 0xc0002000
|
|
#endif
|
|
|
|
.section ".init.data", "aw"
|
|
#include "../lib/hw_settings.S"
|