| /* $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 |
| /* The IO_* macros use the ## token concatenation operator, so |
| -traditional must not be used when assembling this file. */ |
| #include <asm/arch/sv_addr_ag.h> |
| |
| #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) |
| |
| ;; 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 ".init.text", "ax" |
| _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 |
| |
| ;; Set up waitstates etc according to kernel configuration. |
| #ifndef CONFIG_SVINTO_SIM |
| move.d CONFIG_ETRAX_DEF_R_WAITSTATES, $r0 |
| move.d $r0, [R_WAITSTATES] |
| |
| move.d CONFIG_ETRAX_DEF_R_BUS_CONFIG, $r0 |
| move.d $r0, [R_BUS_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: |
| |
| ;; 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" |
