head.S
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- /* $Id: head.S,v 1.44 2002/02/05 15:39:57 bjornw 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 1.44 2002/02/05 15:39:57 bjornw
- * Oops.. non-CRAMFS_MAGIC should jump over the copying, not into it...
- *
- * 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. */
- #include <asm/sv_addr_ag.h>
- #define CRAMFS_MAGIC 0x28cd3d45
- #define RAM_INIT_MAGIC 0x56902387
- #define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |
- IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk)
-
- ;; exported symbols
-
- .globl etrax_irv
- .globl romfs_start
- .globl romfs_length
- .globl romfs_in_flash
- .globl swapper_pg_dir
-
- .text
- ;; This is the entry point of the kernel. We are in supervisor mode.
- ;; 0x00000000 if Flash, 0x40004000 if DRAM
- ;; since etrax actually starts at address 2 when booting from flash, we
- ;; put a nop (2 bytes) here first so we dont accidentally skip the di
- ;;
- ;; NOTICE! The registers r8 and r9 are used as parameters carrying
- ;; information from the decompressor (if the kernel was compressed).
- ;; They should not be used in the code below until read.
-
- nop
- di
- ;; First setup the kseg_c mapping from where the kernel is linked
- ;; to 0x40000000 (where the actual DRAM resides) otherwise
- ;; we cannot do very much! See arch/cris/README.mm
- ;;
- ;; Notice that since we're potentially running at 0x00 or 0x40 right now,
- ;; we will get a fault as soon as we enable the MMU if we dont
- ;; temporarily map those segments linearily.
- ;;
- ;; Due to a bug in Etrax-100 LX version 1 we need to map the memory
- ;; slightly different. The bug is that you can't remap bit 31 of
- ;; an address. Though we can check the version register for
- ;; whether the bug is present, some constants would then have to
- ;; be variables, so we don't. The drawback is that you can "only" map
- ;; 1G per process with CONFIG_CRIS_LOW_MAP.
- #ifdef CONFIG_CRIS_LOW_MAP
- ; kseg mappings, temporary map of 0xc0->0x40
- move.d IO_FIELD (R_MMU_KBASE_HI, base_c, 4)
- | IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb)
- | IO_FIELD (R_MMU_KBASE_HI, base_9, 9)
- | IO_FIELD (R_MMU_KBASE_HI, base_8, 8), $r0
- move.d $r0, [R_MMU_KBASE_HI]
- ; temporary map of 0x40->0x40 and 0x60->0x40
- move.d IO_FIELD (R_MMU_KBASE_LO, base_6, 4)
- | IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0
- move.d $r0, [R_MMU_KBASE_LO]
- ; mmu enable, segs e,c,b,a,6,5,4,0 segment mapped
- move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable)
- | IO_STATE (R_MMU_CONFIG, inv_excp, enable)
- | IO_STATE (R_MMU_CONFIG, acc_excp, enable)
- | IO_STATE (R_MMU_CONFIG, we_excp, enable)
- | IO_STATE (R_MMU_CONFIG, seg_f, page)
- | IO_STATE (R_MMU_CONFIG, seg_e, seg)
- | IO_STATE (R_MMU_CONFIG, seg_d, page)
- | IO_STATE (R_MMU_CONFIG, seg_c, seg)
- | IO_STATE (R_MMU_CONFIG, seg_b, seg)
- | IO_STATE (R_MMU_CONFIG, seg_a, seg)
- | IO_STATE (R_MMU_CONFIG, seg_9, page)
- | IO_STATE (R_MMU_CONFIG, seg_8, page)
- | IO_STATE (R_MMU_CONFIG, seg_7, page)
- | IO_STATE (R_MMU_CONFIG, seg_6, seg)
- | IO_STATE (R_MMU_CONFIG, seg_5, seg)
- | IO_STATE (R_MMU_CONFIG, seg_4, seg)
- | IO_STATE (R_MMU_CONFIG, seg_3, page)
- | IO_STATE (R_MMU_CONFIG, seg_2, page)
- | IO_STATE (R_MMU_CONFIG, seg_1, page)
- | IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0
- move.d $r0, [R_MMU_CONFIG]
- #else
- ; kseg mappings
- move.d IO_FIELD (R_MMU_KBASE_HI, base_e, 8)
- | IO_FIELD (R_MMU_KBASE_HI, base_c, 4)
- | IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb), $r0
- move.d $r0, [R_MMU_KBASE_HI]
- ; temporary map of 0x40->0x40 and 0x00->0x00
- move.d IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0
- move.d $r0, [R_MMU_KBASE_LO]
- ; mmu enable, segs f,e,c,b,4,0 segment mapped
- move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable)
- | IO_STATE (R_MMU_CONFIG, inv_excp, enable)
- | IO_STATE (R_MMU_CONFIG, acc_excp, enable)
- | IO_STATE (R_MMU_CONFIG, we_excp, enable)
- | IO_STATE (R_MMU_CONFIG, seg_f, seg)
- | IO_STATE (R_MMU_CONFIG, seg_e, seg)
- | IO_STATE (R_MMU_CONFIG, seg_d, page)
- | IO_STATE (R_MMU_CONFIG, seg_c, seg)
- | IO_STATE (R_MMU_CONFIG, seg_b, seg)
- | IO_STATE (R_MMU_CONFIG, seg_a, page)
- | IO_STATE (R_MMU_CONFIG, seg_9, page)
- | IO_STATE (R_MMU_CONFIG, seg_8, page)
- | IO_STATE (R_MMU_CONFIG, seg_7, page)
- | IO_STATE (R_MMU_CONFIG, seg_6, page)
- | IO_STATE (R_MMU_CONFIG, seg_5, page)
- | IO_STATE (R_MMU_CONFIG, seg_4, seg)
- | IO_STATE (R_MMU_CONFIG, seg_3, page)
- | IO_STATE (R_MMU_CONFIG, seg_2, page)
- | IO_STATE (R_MMU_CONFIG, seg_1, page)
- | IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0
- move.d $r0, [R_MMU_CONFIG]
- #endif
- ;; Now we need to sort out the segments and their locations in RAM or
- ;; Flash. The image in the Flash (or in DRAM) consists of 3 pieces:
- ;; 1) kernel text, 2) kernel data, 3) ROM filesystem image
- ;; But the linker has linked the kernel to expect this layout in
- ;; DRAM memory:
- ;; 1) kernel text, 2) kernel data, 3) kernel BSS
- ;; (the location of the ROM filesystem is determined by the krom driver)
- ;; If we boot this from Flash, we want to keep the ROM filesystem in
- ;; the flash, we want to copy the text and need to copy the data to DRAM.
- ;; But if we boot from DRAM, we need to move the ROMFS image
- ;; from its position after kernel data, to after kernel BSS, BEFORE the
- ;; kernel starts using the BSS area (since its "overlayed" with the ROMFS)
- ;;
- ;; In both cases, we start in un-cached mode, and need to jump into a
- ;; cached PC after we're done fiddling around with the segments.
- ;;
- ;; arch/etrax100/etrax100.ld sets some symbols that define the start
- ;; and end of each segment.
-
- ;; Check if we start from DRAM or FLASH by testing PC
-
- move.d $pc,$r0
- and.d 0x7fffffff,$r0 ; get rid of the non-cache bit
- cmp.d 0x10000,$r0 ; arbitrary... just something above this code
- blo _inflash0
- nop
- jump _inram ; enter cached ram
- ;; Jumpgate for branches.
- _inflash0:
- jump _inflash
- ;; Put this in a suitable section where we can reclaim storage
- ;; after init.
- .section ".text.init"
- _inflash:
- #ifdef CONFIG_ETRAX_ETHERNET
- ;; Start MII clock to make sure it is running when tranceiver is reset
- move.d START_ETHERNET_CLOCK, $r0
- move.d $r0, [R_NETWORK_GEN_CONFIG]
- #endif
-
- ;; We need to initialze DRAM registers before we start using the DRAM
- cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized?
- beq _dram_init_finished
- nop
-
- #include "../lib/dram_init.S"
- _dram_init_finished:
- ;; Copy text+data to DRAM
- ;; This is fragile - the calculation of r4 as the image size depends
- ;; on that the labels below actually are the first and last positions
- ;; in the linker-script.
- ;;
- ;; Then the locating of the cramfs image depends on the aforementioned
- ;; image being located in the flash at 0. This is most often not true,
- ;; thus the following does not work (normally there is a rescue-block
- ;; between the physical start of the flash and the flash-image start,
- ;; and when run with compression, the kernel is actually unpacked to
- ;; DRAM and we never get here in the first place :))
-
- moveq 0, $r0 ; source
- move.d text_start, $r1 ; destination
- move.d __vmlinux_end, $r2 ; end destination
- move.d $r2, $r4
- sub.d $r1, $r4 ; r4=__vmlinux_end in flash, used below
- 1: move.w [$r0+], $r3
- move.w $r3, [$r1+]
- cmp.d $r2, $r1
- blo 1b
- nop
- ;; We keep the cramfs in the flash.
- ;; There might be none, but that does not matter because
- ;; we don't do anything than read some bytes here.
- moveq 0, $r0
- move.d $r0, [romfs_length] ; default if there is no cramfs
- move.d [$r4], $r0 ; cramfs_super.magic
- cmp.d CRAMFS_MAGIC, $r0
- bne 1f
- nop
- move.d [$r4 + 4], $r0 ; cramfs_super.size
- move.d $r0, [romfs_length]
- #ifdef CONFIG_CRIS_LOW_MAP
- add.d 0x50000000, $r4 ; add flash start in virtual memory (cached)
- #else
- add.d 0xf0000000, $r4 ; add flash start in virtual memory (cached)
- #endif
- move.d $r4, [romfs_start]
- 1:
- moveq 1, $r0
- move.d $r0, [romfs_in_flash]
-
- jump _start_it ; enter code, cached this time
- _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:
- ;; 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_task_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,$r0
- #if (!defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT0))
- && !defined(CONFIG_DMA_MEMCPY)
- ; DMA channels 6 and 7 to ser0, kgdb doesnt want DMA
- or.d IO_STATE (R_GEN_CONFIG, dma7, serial0)
- | IO_STATE (R_GEN_CONFIG, dma6, serial0),$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
- #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),$r0
- #endif
- #if defined(CONFIG_BLUETOOTH) && (defined(CONFIG_BLUETOOTH_RESET_G10) || defined(CONFIG_BLUETOOTH_RESET_G11))
- or.d IO_STATE (R_GEN_CONFIG, g8_15dir, out),$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 ".data.init"
- #include "../lib/hw_settings.S"