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CRIS v10: Setup serial port 2 to avoid accidental TXD pulse on startup.
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If serial port 2 is used, select it in R_GEN_CONFIG.
If serial port 2 is used, setup the control registers for the port.
This is done to avoid a pulse on the TXD line during start up,
which could disturb some units.

Also, remove useless CVS id and log.
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Jesper Nilsson committed Feb 8, 2008
1 parent c974a9e commit 5f526d1
Showing 1 changed file with 43 additions and 178 deletions.
221 changes: 43 additions & 178 deletions arch/cris/arch-v10/kernel/head.S
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Original file line number Diff line number Diff line change
@@ -1,186 +1,10 @@
/* $Id: head.S,v 1.10 2005/06/20 05:12:54 starvik Exp $
*
/*
* Head of the kernel - alter with care
*
* Copyright (C) 2000, 2001 Axis Communications AB
*
* Authors: Bjorn Wesen (bjornw@axis.com)
*
* $Log: head.S,v $
* Revision 1.10 2005/06/20 05:12:54 starvik
* Remove unnecessary diff to kernel.org tree
*
* Revision 1.9 2004/12/13 12:21:51 starvik
* Added I/O and DMA allocators from Linux 2.4
*
* Revision 1.8 2004/11/22 11:41:14 starvik
* Kernel command line may be supplied to kernel. Not used by Axis but may
* be used by customers.
*
* Revision 1.7 2004/05/14 07:58:01 starvik
* Merge of changes from 2.4
*
* Revision 1.6 2003/04/28 05:31:46 starvik
* Added section attributes
*
* Revision 1.5 2002/12/11 15:42:02 starvik
* Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/*.c
*
* Revision 1.4 2002/11/07 09:00:44 starvik
* Names changed for init sections
* init_task_union -> init_thread_union
*
* Revision 1.3 2002/02/05 15:38:23 bjornw
* Oops.. non-CRAMFS_MAGIC should jump over the copying, not into it...
*
* Revision 1.2 2001/12/18 13:35:19 bjornw
* Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15).
*
* Revision 1.43 2001/11/08 15:09:43 starvik
* Only start MII clock if Ethernet is configured
*
* Revision 1.42 2001/11/08 14:37:34 starvik
* Start MII clock early to make sure that it is running at tranceiver reset
*
* Revision 1.41 2001/10/29 14:55:58 pkj
* Corrected pa$r0 to par0.
*
* Revision 1.40 2001/10/03 14:59:57 pkj
* Added support for resetting the Bluetooth hardware.
*
* Revision 1.39 2001/10/01 14:45:03 bjornw
* Removed underscores and added register prefixes
*
* Revision 1.38 2001/09/21 07:14:11 jonashg
* Made root filesystem (cramfs) use mtdblock driver when booting from flash.
*
* Revision 1.37 2001/09/11 13:44:29 orjanf
* Decouple usage of serial ports for debug and kgdb.
*
* Revision 1.36 2001/06/29 12:39:31 pkj
* Added support for mirroring the first flash to just below the
* second one, to make them look consecutive to cramfs.
*
* Revision 1.35 2001/06/25 14:07:00 hp
* Fix review comment.
* * head.S: Use IO_STATE, IO_FIELD and IO_MASK constructs instead of
* magic numbers. Add comment that -traditional must not be used.
* * entry.S (SYMBOL_NAME): Change redefinition to use ## concatenation.
* Correct and update comment.
* * Makefile (.S.o): Don't use -traditional. Add comment why the
* toplevel rule can't be used (now that there's a reason).
*
* Revision 1.34 2001/05/15 07:08:14 hp
* Tweak "notice" to reflect that both r8 r9 are used
*
* Revision 1.33 2001/05/15 06:40:05 hp
* Put bulk of code in .text.init, data in .data.init
*
* Revision 1.32 2001/05/15 06:18:56 hp
* Execute review comment: s/bcc/bhs/g; s/bcs/blo/g
*
* Revision 1.31 2001/05/15 06:08:40 hp
* Add sentence about autodetecting the bit31-MMU-bug
*
* Revision 1.30 2001/05/15 06:00:05 hp
* Update comment: LOW_MAP is not forced on xsim anymore.
*
* Revision 1.29 2001/04/18 12:51:59 orjanf
* * Reverted review change regarding the use of bcs/bcc.
* * Removed non-working LED-clearing code.
*
* Revision 1.28 2001/04/17 13:58:39 orjanf
* * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB.
*
* Revision 1.27 2001/04/17 11:42:35 orjanf
* Changed according to review:
* * Added comment explaining memory map bug.
* * Changed bcs and bcc to blo and bhs, respectively.
* * Removed mentioning of Stallone and Olga boards.
*
* Revision 1.26 2001/04/06 12:31:07 jonashg
* Check for cramfs in flash before RAM instead of RAM before flash.
*
* Revision 1.25 2001/04/04 06:23:53 starvik
* Initialize DRAM if not already initialized
*
* Revision 1.24 2001/04/03 11:12:00 starvik
* Removed dram init (done by rescue or etrax100boot
* Corrected include
*
* Revision 1.23 2001/04/03 09:53:03 starvik
* Include hw_settings.S
*
* Revision 1.22 2001/03/26 14:23:26 bjornw
* Namechange of some config options
*
* Revision 1.21 2001/03/08 12:14:41 bjornw
* * Config name for ETRAX IDE was renamed
* * Removed G27 auto-setting when JULIETTE is chosen (need to make this
* a new config option later)
*
* Revision 1.20 2001/02/23 12:47:56 bjornw
* MMU regs during LOW_MAP updated to reflect a newer reality
*
* Revision 1.19 2001/02/19 11:12:07 bjornw
* Changed comment header format
*
* Revision 1.18 2001/02/15 07:25:38 starvik
* Added support for synchronous serial ports
*
* Revision 1.17 2001/02/08 15:53:13 starvik
* Last commit removed some important ifdefs
*
* Revision 1.16 2001/02/08 15:20:38 starvik
* Include dram_init.S as inline
*
* Revision 1.15 2001/01/29 18:12:01 bjornw
* Corrected some comments
*
* Revision 1.14 2001/01/29 13:11:29 starvik
* Include dram_init.S (with DRAM/SDRAM initialization)
*
* Revision 1.13 2001/01/23 14:54:57 markusl
* Updated for USB
* i.e. added r_gen_config settings
*
* Revision 1.12 2001/01/19 16:16:29 perf
* Added temporary mapping of 0x0c->0x0c to avoid flash loading confusion.
* Renamed serial options from ETRAX100 to ETRAX.
*
* Revision 1.11 2001/01/16 16:31:38 bjornw
* * Changed name and semantics of running_from_flash to romfs_in_flash,
* set by head.S to indicate to setup.c whether there is a cramfs image
* after the kernels BSS or not. Should work for all three boot-cases
* (DRAM with cramfs in DRAM, DRAM with cramfs in flash (compressed boot),
* and flash with cramfs in flash)
*
* Revision 1.10 2001/01/16 14:12:21 bjornw
* * Check for cramfs start passed in r9 from the decompressor, if all other
* cramfs options fail (if we boot from DRAM but don't find a cramfs image
* after the kernel in DRAM, it is probably still in the flash)
* * Check magic in cramfs detection when booting from flash directly
*
* Revision 1.9 2001/01/15 17:17:02 bjornw
* * Corrected the code that detects the cramfs lengths
* * Added a comment saying that the above does not work due to other
* reasons..
*
* Revision 1.8 2001/01/15 16:27:51 jonashg
* Made boot after flashing work.
* * end destination is __vmlinux_end in RAM.
* * _romfs_start moved because of virtual memory.
*
* Revision 1.7 2000/11/21 13:55:29 bjornw
* Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type
*
* Revision 1.6 2000/10/06 12:36:55 bjornw
* Forgot swapper_pg_dir when changing memory map..
*
* Revision 1.5 2000/10/04 16:49:30 bjornw
* * Fixed memory mapping in LX
* * Check for cramfs instead of romfs
*
*/

#define ASSEMBLER_MACROS_ONLY
Expand Down Expand Up @@ -595,11 +419,17 @@ no_command_line:

moveq 0,$r0

;; Select or disable serial port 2
#ifdef CONFIG_ETRAX_SERIAL_PORT2
or.d IO_STATE (R_GEN_CONFIG, ser2, select),$r0
#else
or.d IO_STATE (R_GEN_CONFIG, ser2, disable),$r0
#endif

;; 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) \
Expand Down Expand Up @@ -801,6 +631,41 @@ no_command_line:
| IO_STATE (R_SERIAL1_TR_CTRL, tr_bitnr, tr_8bit),$r0
move.b $r0,[R_SERIAL1_TR_CTRL]

#ifdef CONFIG_ETRAX_SERIAL_PORT2
;; setup the serial port 2 at 115200 baud for debug purposes

moveq IO_STATE (R_SERIAL2_XOFF, tx_stop, enable) \
| IO_STATE (R_SERIAL2_XOFF, auto_xoff, disable) \
| IO_FIELD (R_SERIAL2_XOFF, xoff_char, 0),$r0
move.d $r0,[R_SERIAL2_XOFF]

; 115.2kbaud for both transmit and receive
move.b IO_STATE (R_SERIAL2_BAUD, tr_baud, c115k2Hz) \
| IO_STATE (R_SERIAL2_BAUD, rec_baud, c115k2Hz),$r0
move.b $r0,[R_SERIAL2_BAUD]

; Set up and enable the serial2 receiver.
move.b IO_STATE (R_SERIAL2_REC_CTRL, dma_err, stop) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_enable, enable) \
| IO_STATE (R_SERIAL2_REC_CTRL, rts_, active) \
| IO_STATE (R_SERIAL2_REC_CTRL, sampling, middle) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_stick_par, normal) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_par, even) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_par_en, disable) \
| IO_STATE (R_SERIAL2_REC_CTRL, rec_bitnr, rec_8bit),$r0
move.b $r0,[R_SERIAL2_REC_CTRL]

; Set up and enable the serial2 transmitter.
move.b IO_FIELD (R_SERIAL2_TR_CTRL, txd, 0) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_enable, enable) \
| IO_STATE (R_SERIAL2_TR_CTRL, auto_cts, disabled) \
| IO_STATE (R_SERIAL2_TR_CTRL, stop_bits, one_bit) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_stick_par, normal) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_par, even) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_par_en, disable) \
| IO_STATE (R_SERIAL2_TR_CTRL, tr_bitnr, tr_8bit),$r0
move.b $r0,[R_SERIAL2_TR_CTRL]
#endif

#ifdef CONFIG_ETRAX_SERIAL_PORT3
;; setup the serial port 3 at 115200 baud for debug purposes
Expand Down

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