-/* $Id: head.S,v 1.7 2004/05/14 07:58:01 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 1.7 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
- *
*/
-#include <linux/config.h>
#define ASSEMBLER_MACROS_ONLY
/* The IO_* macros use the ## token concatenation operator, so
-traditional must not be used when assembling this file. */
#define CRAMFS_MAGIC 0x28cd3d45
#define RAM_INIT_MAGIC 0x56902387
+#define COMMAND_LINE_MAGIC 0x87109563
#define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\
IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk)
_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, $r13
+ bne 1b
+ nop
+
+no_command_line:
+
;; the kernel stack is overlayed with the task structure for each
;; task. thus the initial kernel stack is in the same page as the
;; init_task (but starts in the top of the page, size 8192)
;; Etrax product HW genconfig setup
moveq 0,$r0
-#if (!defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT0)) \
- && !defined(CONFIG_DMA_MEMCPY)
- ; DMA channels 6 and 7 to ser0, kgdb doesnt want DMA
- or.d IO_STATE (R_GEN_CONFIG, dma7, serial0) \
- | IO_STATE (R_GEN_CONFIG, dma6, serial0),$r0
-#endif
-#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT1)
- ; DMA channels 8 and 9 to ser1, kgdb doesnt want DMA
- or.d IO_STATE (R_GEN_CONFIG, dma9, serial1) \
- | IO_STATE (R_GEN_CONFIG, dma8, serial1),$r0
-#endif
-#ifdef CONFIG_DMA_MEMCPY
- ; 6/7 memory-memory DMA
- or.d IO_STATE (R_GEN_CONFIG, dma7, intdma6) \
- | IO_STATE (R_GEN_CONFIG, dma6, intdma7),$r0
-#endif
+
+ ;; Select or disable serial port 2
#ifdef CONFIG_ETRAX_SERIAL_PORT2
- ; Enable serial port 2
- or.w IO_STATE (R_GEN_CONFIG, ser2, select),$r0
-#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT2)
- ; DMA channels 2 and 3 to ser2, kgdb doesnt want DMA
- or.d IO_STATE (R_GEN_CONFIG, dma3, serial2) \
- | IO_STATE (R_GEN_CONFIG, dma2, serial2),$r0
-#endif
-#endif
-#if defined(CONFIG_ETRAX_SERIAL_PORT3) || defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1)
- ; Enable serial port 3
- or.w IO_STATE (R_GEN_CONFIG, ser3, select),$r0
-#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT3)
- ; DMA channels 4 and 5 to ser3, kgdb doesnt want DMA
- or.d IO_STATE (R_GEN_CONFIG, dma5, serial3) \
- | IO_STATE (R_GEN_CONFIG, dma4, serial3),$r0
-#endif
-#endif
-#if defined(CONFIG_ETRAX_PARALLEL_PORT0) || defined(CONFIG_ETRAX_ETHERNET_LPSLAVE)
- ; parport 0 enabled using DMA 2/3
- or.w IO_STATE (R_GEN_CONFIG, par0, select),$r0
-#endif
-#if defined(CONFIG_ETRAX_PARALLEL_PORT1) || defined(CONFIG_ETRAX_ETHERNET_LPSLAVE)
- ; parport 1 enabled using DMA 4/5
- or.w IO_STATE (R_GEN_CONFIG, par1, select),$r0
-#endif
-#ifdef CONFIG_ETRAX_IDE
- ; DMA channels 2 and 3 to ATA, ATA enabled
- or.d IO_STATE (R_GEN_CONFIG, dma3, ata) \
- | IO_STATE (R_GEN_CONFIG, dma2, ata) \
- | IO_STATE (R_GEN_CONFIG, ata, select),$r0
-#endif
-
-#ifdef CONFIG_ETRAX_USB_HOST_PORT1
- ; Set the USB port 1 enable bit
- or.d IO_STATE (R_GEN_CONFIG, usb1, select),$r0
-#endif
-#ifdef CONFIG_ETRAX_USB_HOST_PORT2
- ; Set the USB port 2 enable bit
- or.d IO_STATE (R_GEN_CONFIG, usb2, select),$r0
-#endif
-#ifdef CONFIG_ETRAX_USB_HOST
- ; Connect DMA channels 8 and 9 to USB
- and.d (~(IO_MASK (R_GEN_CONFIG, dma9) \
- | IO_MASK (R_GEN_CONFIG, dma8))) \
- | IO_STATE (R_GEN_CONFIG, dma9, usb) \
- | IO_STATE (R_GEN_CONFIG, dma8, usb),$r0
-#endif
-
-#ifdef CONFIG_JULIETTE
- ; DMA channels 4 and 5 to EXTDMA0, for Juliette
- or.d IO_STATE (R_GEN_CONFIG, dma5, extdma0) \
- | IO_STATE (R_GEN_CONFIG, dma4, extdma0),$r0
-#endif
+ 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, 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),$r0
| IO_STATE (R_SERIAL1_TR_CTRL, tr_bitnr, tr_8bit),$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
projects / linux-2.6 / blobdiff