1/* $Id: head.S,v 1.47 2003/07/08 09:53:35 starvik Exp $ 2 * 3 * Head of the kernel - alter with care 4 * 5 * Copyright (C) 2000, 2001 Axis Communications AB 6 * 7 * Authors: Bjorn Wesen (bjornw@axis.com) 8 * 9 * $Log: head.S,v $ 10 * Revision 1.47 2003/07/08 09:53:35 starvik 11 * Corrected last CVS log entry 12 * 13 * Revision 1.46 2003/05/15 08:07:51 gunnard 14 * Removed serial port DMA when using AGDB. 15 * 16 * Revision 1.45 2003/04/28 05:31:05 starvik 17 * Added section attributes 18 * 19 * Revision 1.44 2002/02/05 15:39:57 bjornw 20 * Oops.. non-CRAMFS_MAGIC should jump over the copying, not into it... 21 * 22 * Revision 1.43 2001/11/08 15:09:43 starvik 23 * Only start MII clock if Ethernet is configured 24 * 25 * Revision 1.42 2001/11/08 14:37:34 starvik 26 * Start MII clock early to make sure that it is running at tranceiver reset 27 * 28 * Revision 1.41 2001/10/29 14:55:58 pkj 29 * Corrected pa$r0 to par0. 30 * 31 * Revision 1.40 2001/10/03 14:59:57 pkj 32 * Added support for resetting the Bluetooth hardware. 33 * 34 * Revision 1.39 2001/10/01 14:45:03 bjornw 35 * Removed underscores and added register prefixes 36 * 37 * Revision 1.38 2001/09/21 07:14:11 jonashg 38 * Made root filesystem (cramfs) use mtdblock driver when booting from flash. 39 * 40 * Revision 1.37 2001/09/11 13:44:29 orjanf 41 * Decouple usage of serial ports for debug and kgdb. 42 * 43 * Revision 1.36 2001/06/29 12:39:31 pkj 44 * Added support for mirroring the first flash to just below the 45 * second one, to make them look consecutive to cramfs. 46 * 47 * Revision 1.35 2001/06/25 14:07:00 hp 48 * Fix review comment. 49 * * head.S: Use IO_STATE, IO_FIELD and IO_MASK constructs instead of 50 * magic numbers. Add comment that -traditional must not be used. 51 * * entry.S (SYMBOL_NAME): Change redefinition to use ## concatenation. 52 * Correct and update comment. 53 * * Makefile (.S.o): Don't use -traditional. Add comment why the 54 * toplevel rule can't be used (now that there's a reason). 55 * 56 * Revision 1.34 2001/05/15 07:08:14 hp 57 * Tweak "notice" to reflect that both r8 r9 are used 58 * 59 * Revision 1.33 2001/05/15 06:40:05 hp 60 * Put bulk of code in .text.init, data in .data.init 61 * 62 * Revision 1.32 2001/05/15 06:18:56 hp 63 * Execute review comment: s/bcc/bhs/g; s/bcs/blo/g 64 * 65 * Revision 1.31 2001/05/15 06:08:40 hp 66 * Add sentence about autodetecting the bit31-MMU-bug 67 * 68 * Revision 1.30 2001/05/15 06:00:05 hp 69 * Update comment: LOW_MAP is not forced on xsim anymore. 70 * 71 * Revision 1.29 2001/04/18 12:51:59 orjanf 72 * * Reverted review change regarding the use of bcs/bcc. 73 * * Removed non-working LED-clearing code. 74 * 75 * Revision 1.28 2001/04/17 13:58:39 orjanf 76 * * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB. 77 * 78 * Revision 1.27 2001/04/17 11:42:35 orjanf 79 * Changed according to review: 80 * * Added comment explaining memory map bug. 81 * * Changed bcs and bcc to blo and bhs, respectively. 82 * * Removed mentioning of Stallone and Olga boards. 83 * 84 * Revision 1.26 2001/04/06 12:31:07 jonashg 85 * Check for cramfs in flash before RAM instead of RAM before flash. 86 * 87 * Revision 1.25 2001/04/04 06:23:53 starvik 88 * Initialize DRAM if not already initialized 89 * 90 * Revision 1.24 2001/04/03 11:12:00 starvik 91 * Removed dram init (done by rescue or etrax100boot 92 * Corrected include 93 * 94 * Revision 1.23 2001/04/03 09:53:03 starvik 95 * Include hw_settings.S 96 * 97 * Revision 1.22 2001/03/26 14:23:26 bjornw 98 * Namechange of some config options 99 * 100 * Revision 1.21 2001/03/08 12:14:41 bjornw 101 * * Config name for ETRAX IDE was renamed 102 * * Removed G27 auto-setting when JULIETTE is chosen (need to make this 103 * a new config option later) 104 * 105 * Revision 1.20 2001/02/23 12:47:56 bjornw 106 * MMU regs during LOW_MAP updated to reflect a newer reality 107 * 108 * Revision 1.19 2001/02/19 11:12:07 bjornw 109 * Changed comment header format 110 * 111 * Revision 1.18 2001/02/15 07:25:38 starvik 112 * Added support for synchronous serial ports 113 * 114 * Revision 1.17 2001/02/08 15:53:13 starvik 115 * Last commit removed some important ifdefs 116 * 117 * Revision 1.16 2001/02/08 15:20:38 starvik 118 * Include dram_init.S as inline 119 * 120 * Revision 1.15 2001/01/29 18:12:01 bjornw 121 * Corrected some comments 122 * 123 * Revision 1.14 2001/01/29 13:11:29 starvik 124 * Include dram_init.S (with DRAM/SDRAM initialization) 125 * 126 * Revision 1.13 2001/01/23 14:54:57 markusl 127 * Updated for USB 128 * i.e. added r_gen_config settings 129 * 130 * Revision 1.12 2001/01/19 16:16:29 perf 131 * Added temporary mapping of 0x0c->0x0c to avoid flash loading confusion. 132 * Renamed serial options from ETRAX100 to ETRAX. 133 * 134 * Revision 1.11 2001/01/16 16:31:38 bjornw 135 * * Changed name and semantics of running_from_flash to romfs_in_flash, 136 * set by head.S to indicate to setup.c whether there is a cramfs image 137 * after the kernels BSS or not. Should work for all three boot-cases 138 * (DRAM with cramfs in DRAM, DRAM with cramfs in flash (compressed boot), 139 * and flash with cramfs in flash) 140 * 141 * Revision 1.10 2001/01/16 14:12:21 bjornw 142 * * Check for cramfs start passed in r9 from the decompressor, if all other 143 * cramfs options fail (if we boot from DRAM but don't find a cramfs image 144 * after the kernel in DRAM, it is probably still in the flash) 145 * * Check magic in cramfs detection when booting from flash directly 146 * 147 * Revision 1.9 2001/01/15 17:17:02 bjornw 148 * * Corrected the code that detects the cramfs lengths 149 * * Added a comment saying that the above does not work due to other 150 * reasons.. 151 * 152 * Revision 1.8 2001/01/15 16:27:51 jonashg 153 * Made boot after flashing work. 154 * * end destination is __vmlinux_end in RAM. 155 * * _romfs_start moved because of virtual memory. 156 * 157 * Revision 1.7 2000/11/21 13:55:29 bjornw 158 * Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type 159 * 160 * Revision 1.6 2000/10/06 12:36:55 bjornw 161 * Forgot swapper_pg_dir when changing memory map.. 162 * 163 * Revision 1.5 2000/10/04 16:49:30 bjornw 164 * * Fixed memory mapping in LX 165 * * Check for cramfs instead of romfs 166 * 167 */ 168 169#include <linux/config.h> 170#define ASSEMBLER_MACROS_ONLY 171/* The IO_* macros use the ## token concatenation operator, so 172 -traditional must not be used when assembling this file. */ 173#include <asm/sv_addr_ag.h> 174 175#define CRAMFS_MAGIC 0x28cd3d45 176#define RAM_INIT_MAGIC 0x56902387 177 178#define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\ 179 IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk) 180 181 ;; exported symbols 182 183 .globl etrax_irv 184 .globl romfs_start 185 .globl romfs_length 186 .globl romfs_in_flash 187 .globl swapper_pg_dir 188 189 .text 190 191 ;; This is the entry point of the kernel. We are in supervisor mode. 192 ;; 0x00000000 if Flash, 0x40004000 if DRAM 193 ;; since etrax actually starts at address 2 when booting from flash, we 194 ;; put a nop (2 bytes) here first so we dont accidentally skip the di 195 ;; 196 ;; NOTICE! The registers r8 and r9 are used as parameters carrying 197 ;; information from the decompressor (if the kernel was compressed). 198 ;; They should not be used in the code below until read. 199 200 nop 201 di 202 203 ;; First setup the kseg_c mapping from where the kernel is linked 204 ;; to 0x40000000 (where the actual DRAM resides) otherwise 205 ;; we cannot do very much! See arch/cris/README.mm 206 ;; 207 ;; Notice that since we're potentially running at 0x00 or 0x40 right now, 208 ;; we will get a fault as soon as we enable the MMU if we dont 209 ;; temporarily map those segments linearily. 210 ;; 211 ;; Due to a bug in Etrax-100 LX version 1 we need to map the memory 212 ;; slightly different. The bug is that you can't remap bit 31 of 213 ;; an address. Though we can check the version register for 214 ;; whether the bug is present, some constants would then have to 215 ;; be variables, so we don't. The drawback is that you can "only" map 216 ;; 1G per process with CONFIG_CRIS_LOW_MAP. 217 218#ifdef CONFIG_CRIS_LOW_MAP 219 ; kseg mappings, temporary map of 0xc0->0x40 220 move.d IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \ 221 | IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb) \ 222 | IO_FIELD (R_MMU_KBASE_HI, base_9, 9) \ 223 | IO_FIELD (R_MMU_KBASE_HI, base_8, 8), $r0 224 move.d $r0, [R_MMU_KBASE_HI] 225 226 ; temporary map of 0x40->0x40 and 0x60->0x40 227 move.d IO_FIELD (R_MMU_KBASE_LO, base_6, 4) \ 228 | IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0 229 move.d $r0, [R_MMU_KBASE_LO] 230 231 ; mmu enable, segs e,c,b,a,6,5,4,0 segment mapped 232 move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \ 233 | IO_STATE (R_MMU_CONFIG, inv_excp, enable) \ 234 | IO_STATE (R_MMU_CONFIG, acc_excp, enable) \ 235 | IO_STATE (R_MMU_CONFIG, we_excp, enable) \ 236 | IO_STATE (R_MMU_CONFIG, seg_f, page) \ 237 | IO_STATE (R_MMU_CONFIG, seg_e, seg) \ 238 | IO_STATE (R_MMU_CONFIG, seg_d, page) \ 239 | IO_STATE (R_MMU_CONFIG, seg_c, seg) \ 240 | IO_STATE (R_MMU_CONFIG, seg_b, seg) \ 241 | IO_STATE (R_MMU_CONFIG, seg_a, seg) \ 242 | IO_STATE (R_MMU_CONFIG, seg_9, page) \ 243 | IO_STATE (R_MMU_CONFIG, seg_8, page) \ 244 | IO_STATE (R_MMU_CONFIG, seg_7, page) \ 245 | IO_STATE (R_MMU_CONFIG, seg_6, seg) \ 246 | IO_STATE (R_MMU_CONFIG, seg_5, seg) \ 247 | IO_STATE (R_MMU_CONFIG, seg_4, seg) \ 248 | IO_STATE (R_MMU_CONFIG, seg_3, page) \ 249 | IO_STATE (R_MMU_CONFIG, seg_2, page) \ 250 | IO_STATE (R_MMU_CONFIG, seg_1, page) \ 251 | IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0 252 move.d $r0, [R_MMU_CONFIG] 253#else 254 ; kseg mappings 255 move.d IO_FIELD (R_MMU_KBASE_HI, base_e, 8) \ 256 | IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \ 257 | IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb), $r0 258 move.d $r0, [R_MMU_KBASE_HI] 259 260 ; temporary map of 0x40->0x40 and 0x00->0x00 261 move.d IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0 262 move.d $r0, [R_MMU_KBASE_LO] 263 264 ; mmu enable, segs f,e,c,b,4,0 segment mapped 265 move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \ 266 | IO_STATE (R_MMU_CONFIG, inv_excp, enable) \ 267 | IO_STATE (R_MMU_CONFIG, acc_excp, enable) \ 268 | IO_STATE (R_MMU_CONFIG, we_excp, enable) \ 269 | IO_STATE (R_MMU_CONFIG, seg_f, seg) \ 270 | IO_STATE (R_MMU_CONFIG, seg_e, seg) \ 271 | IO_STATE (R_MMU_CONFIG, seg_d, page) \ 272 | IO_STATE (R_MMU_CONFIG, seg_c, seg) \ 273 | IO_STATE (R_MMU_CONFIG, seg_b, seg) \ 274 | IO_STATE (R_MMU_CONFIG, seg_a, page) \ 275 | IO_STATE (R_MMU_CONFIG, seg_9, page) \ 276 | IO_STATE (R_MMU_CONFIG, seg_8, page) \ 277 | IO_STATE (R_MMU_CONFIG, seg_7, page) \ 278 | IO_STATE (R_MMU_CONFIG, seg_6, page) \ 279 | IO_STATE (R_MMU_CONFIG, seg_5, page) \ 280 | IO_STATE (R_MMU_CONFIG, seg_4, seg) \ 281 | IO_STATE (R_MMU_CONFIG, seg_3, page) \ 282 | IO_STATE (R_MMU_CONFIG, seg_2, page) \ 283 | IO_STATE (R_MMU_CONFIG, seg_1, page) \ 284 | IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0 285 move.d $r0, [R_MMU_CONFIG] 286#endif 287 288 ;; Now we need to sort out the segments and their locations in RAM or 289 ;; Flash. The image in the Flash (or in DRAM) consists of 3 pieces: 290 ;; 1) kernel text, 2) kernel data, 3) ROM filesystem image 291 ;; But the linker has linked the kernel to expect this layout in 292 ;; DRAM memory: 293 ;; 1) kernel text, 2) kernel data, 3) kernel BSS 294 ;; (the location of the ROM filesystem is determined by the krom driver) 295 ;; If we boot this from Flash, we want to keep the ROM filesystem in 296 ;; the flash, we want to copy the text and need to copy the data to DRAM. 297 ;; But if we boot from DRAM, we need to move the ROMFS image 298 ;; from its position after kernel data, to after kernel BSS, BEFORE the 299 ;; kernel starts using the BSS area (since its "overlayed" with the ROMFS) 300 ;; 301 ;; In both cases, we start in un-cached mode, and need to jump into a 302 ;; cached PC after we're done fiddling around with the segments. 303 ;; 304 ;; arch/etrax100/etrax100.ld sets some symbols that define the start 305 ;; and end of each segment. 306 307 ;; Check if we start from DRAM or FLASH by testing PC 308 309 move.d $pc,$r0 310 and.d 0x7fffffff,$r0 ; get rid of the non-cache bit 311 cmp.d 0x10000,$r0 ; arbitrary... just something above this code 312 blo _inflash0 313 nop 314 315 jump _inram ; enter cached ram 316 317 ;; Jumpgate for branches. 318_inflash0: 319 jump _inflash 320 321 ;; Put this in a suitable section where we can reclaim storage 322 ;; after init. 323 .section ".text.init", "ax" 324_inflash: 325#ifdef CONFIG_ETRAX_ETHERNET 326 ;; Start MII clock to make sure it is running when tranceiver is reset 327 move.d START_ETHERNET_CLOCK, $r0 328 move.d $r0, [R_NETWORK_GEN_CONFIG] 329#endif 330 331 ;; We need to initialze DRAM registers before we start using the DRAM 332 333 cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized? 334 beq _dram_init_finished 335 nop 336 337#include "../lib/dram_init.S" 338 339_dram_init_finished: 340 ;; Copy text+data to DRAM 341 ;; This is fragile - the calculation of r4 as the image size depends 342 ;; on that the labels below actually are the first and last positions 343 ;; in the linker-script. 344 ;; 345 ;; Then the locating of the cramfs image depends on the aforementioned 346 ;; image being located in the flash at 0. This is most often not true, 347 ;; thus the following does not work (normally there is a rescue-block 348 ;; between the physical start of the flash and the flash-image start, 349 ;; and when run with compression, the kernel is actually unpacked to 350 ;; DRAM and we never get here in the first place :)) 351 352 moveq 0, $r0 ; source 353 move.d text_start, $r1 ; destination 354 move.d __vmlinux_end, $r2 ; end destination 355 move.d $r2, $r4 356 sub.d $r1, $r4 ; r4=__vmlinux_end in flash, used below 3571: move.w [$r0+], $r3 358 move.w $r3, [$r1+] 359 cmp.d $r2, $r1 360 blo 1b 361 nop 362 363 ;; We keep the cramfs in the flash. 364 ;; There might be none, but that does not matter because 365 ;; we don't do anything than read some bytes here. 366 367 moveq 0, $r0 368 move.d $r0, [romfs_length] ; default if there is no cramfs 369 370 move.d [$r4], $r0 ; cramfs_super.magic 371 cmp.d CRAMFS_MAGIC, $r0 372 bne 1f 373 nop 374 move.d [$r4 + 4], $r0 ; cramfs_super.size 375 move.d $r0, [romfs_length] 376#ifdef CONFIG_CRIS_LOW_MAP 377 add.d 0x50000000, $r4 ; add flash start in virtual memory (cached) 378#else 379 add.d 0xf0000000, $r4 ; add flash start in virtual memory (cached) 380#endif 381 move.d $r4, [romfs_start] 3821: 383 moveq 1, $r0 384 move.d $r0, [romfs_in_flash] 385 386 jump _start_it ; enter code, cached this time 387 388_inram: 389 ;; Move the ROM fs to after BSS end. This assumes that the cramfs 390 ;; second longword contains the length of the cramfs 391 392 moveq 0, $r0 393 move.d $r0, [romfs_length] ; default if there is no cramfs 394 395 ;; The kernel could have been unpacked to DRAM by the loader, but 396 ;; the cramfs image could still be in the Flash directly after the 397 ;; compressed kernel image. The loader passes the address of the 398 ;; byte succeeding the last compressed byte in the flash in the 399 ;; register r9 when starting the kernel. Check if r9 points to a 400 ;; decent cramfs image! 401 ;; (Notice that if this is not booted from the loader, r9 will be 402 ;; garbage but we do sanity checks on it, the chance that it points 403 ;; to a cramfs magic is small.. ) 404 405 cmp.d 0x0ffffff8, $r9 406 bhs _no_romfs_in_flash ; r9 points outside the flash area 407 nop 408 move.d [$r9], $r0 ; cramfs_super.magic 409 cmp.d CRAMFS_MAGIC, $r0 410 bne _no_romfs_in_flash 411 nop 412 move.d [$r9+4], $r0 ; cramfs_super.length 413 move.d $r0, [romfs_length] 414#ifdef CONFIG_CRIS_LOW_MAP 415 add.d 0x50000000, $r9 ; add flash start in virtual memory (cached) 416#else 417 add.d 0xf0000000, $r9 ; add flash start in virtual memory (cached) 418#endif 419 move.d $r9, [romfs_start] 420 421 moveq 1, $r0 422 move.d $r0, [romfs_in_flash] 423 424 jump _start_it ; enter code, cached this time 425 426_no_romfs_in_flash: 427 ;; Check if there is a cramfs (magic value). 428 ;; Notice that we check for cramfs magic value - which is 429 ;; the "rom fs" we'll possibly use in 2.4 if not JFFS (which does 430 ;; not need this mechanism anyway) 431 432 move.d __vmlinux_end, $r0; the image will be after the vmlinux end address 433 move.d [$r0], $r1 ; cramfs assumes same endian on host/target 434 cmp.d CRAMFS_MAGIC, $r1; magic value in cramfs superblock 435 bne 2f 436 nop 437 438 ;; Ok. What is its size ? 439 440 move.d [$r0 + 4], $r2 ; cramfs_super.size (again, no need to swapwb) 441 442 ;; We want to copy it to the end of the BSS 443 444 move.d _end, $r1 445 446 ;; Remember values so cramfs and setup can find this info 447 448 move.d $r1, [romfs_start] ; new romfs location 449 move.d $r2, [romfs_length] 450 451 ;; We need to copy it backwards, since they can be overlapping 452 453 add.d $r2, $r0 454 add.d $r2, $r1 455 456 ;; Go ahead. Make my loop. 457 458 lsrq 1, $r2 ; size is in bytes, we copy words 459 4601: move.w [$r0=$r0-2],$r3 461 move.w $r3,[$r1=$r1-2] 462 subq 1, $r2 463 bne 1b 464 nop 465 4662: 467 ;; Dont worry that the BSS is tainted. It will be cleared later. 468 469 moveq 0, $r0 470 move.d $r0, [romfs_in_flash] 471 472 jump _start_it ; better skip the additional cramfs check below 473 474_start_it: 475 ;; the kernel stack is overlayed with the task structure for each 476 ;; task. thus the initial kernel stack is in the same page as the 477 ;; init_task (but starts in the top of the page, size 8192) 478 move.d init_task_union + 8192, $sp 479 move.d ibr_start,$r0 ; this symbol is set by the linker script 480 move $r0,$ibr 481 move.d $r0,[etrax_irv] ; set the interrupt base register and pointer 482 483 ;; Clear BSS region, from _bss_start to _end 484 485 move.d __bss_start, $r0 486 move.d _end, $r1 4871: clear.d [$r0+] 488 cmp.d $r1, $r0 489 blo 1b 490 nop 491 492#ifdef CONFIG_BLK_DEV_ETRAXIDE 493 ;; disable ATA before enabling it in genconfig below 494 moveq 0,$r0 495 move.d $r0,[R_ATA_CTRL_DATA] 496 move.d $r0,[R_ATA_TRANSFER_CNT] 497 move.d $r0,[R_ATA_CONFIG] 498#if 0 499 move.d R_PORT_G_DATA, $r1 500 move.d $r0, [$r1]; assert ATA bus-reset 501 nop 502 nop 503 nop 504 nop 505 nop 506 nop 507 move.d 0x08000000,$r0 508 move.d $r0,[$r1] 509#endif 510#endif 511 512#ifdef CONFIG_JULIETTE 513 ;; configure external DMA channel 0 before enabling it in genconfig 514 515 moveq 0,$r0 516 move.d $r0,[R_EXT_DMA_0_ADDR] 517 ; cnt enable, word size, output, stop, size 0 518 move.d IO_STATE (R_EXT_DMA_0_CMD, cnt, enable) \ 519 | IO_STATE (R_EXT_DMA_0_CMD, rqpol, ahigh) \ 520 | IO_STATE (R_EXT_DMA_0_CMD, apol, ahigh) \ 521 | IO_STATE (R_EXT_DMA_0_CMD, rq_ack, burst) \ 522 | IO_STATE (R_EXT_DMA_0_CMD, wid, word) \ 523 | IO_STATE (R_EXT_DMA_0_CMD, dir, output) \ 524 | IO_STATE (R_EXT_DMA_0_CMD, run, stop) \ 525 | IO_FIELD (R_EXT_DMA_0_CMD, trf_count, 0),$r0 526 move.d $r0,[R_EXT_DMA_0_CMD] 527 528 ;; reset dma4 and wait for completion 529 530 moveq IO_STATE (R_DMA_CH4_CMD, cmd, reset),$r0 531 move.b $r0,[R_DMA_CH4_CMD] 5321: move.b [R_DMA_CH4_CMD],$r0 533 and.b IO_MASK (R_DMA_CH4_CMD, cmd),$r0 534 cmp.b IO_STATE (R_DMA_CH4_CMD, cmd, reset),$r0 535 beq 1b 536 nop 537 538 ;; reset dma5 and wait for completion 539 540 moveq IO_STATE (R_DMA_CH5_CMD, cmd, reset),$r0 541 move.b $r0,[R_DMA_CH5_CMD] 5421: move.b [R_DMA_CH5_CMD],$r0 543 and.b IO_MASK (R_DMA_CH5_CMD, cmd),$r0 544 cmp.b IO_STATE (R_DMA_CH5_CMD, cmd, reset),$r0 545 beq 1b 546 nop 547#endif 548 549 ;; Etrax product HW genconfig setup 550 551 moveq 0,$r0 552#if (!defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT0)) \ 553 && !defined(CONFIG_DMA_MEMCPY) 554 ; DMA channels 6 and 7 to ser0, kgdb doesnt want DMA 555#if (defined(CONFIG_ETRAX_AGDB)) 556 ; agdb only wants DMA out, no dma in 557 or.d IO_STATE (R_GEN_CONFIG, dma6, serial0),$r0 558#else 559 or.d IO_STATE (R_GEN_CONFIG, dma7, serial0) \ 560 | IO_STATE (R_GEN_CONFIG, dma6, serial0),$r0 561#endif 562#endif 563#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT1) 564 ; DMA channels 8 and 9 to ser1, kgdb doesnt want DMA 565#if (defined(CONFIG_ETRAX_AGDB)) 566 ; agdb only wants DMA out, no dma in 567 or.d IO_STATE (R_GEN_CONFIG, dma8, serial1),$r0 568#else 569 or.d IO_STATE (R_GEN_CONFIG, dma9, serial1) \ 570 | IO_STATE (R_GEN_CONFIG, dma8, serial1),$r0 571#endif 572#endif 573#ifdef CONFIG_DMA_MEMCPY 574 ; 6/7 memory-memory DMA 575 or.d IO_STATE (R_GEN_CONFIG, dma7, intdma6) \ 576 | IO_STATE (R_GEN_CONFIG, dma6, intdma7),$r0 577#endif 578#ifdef CONFIG_ETRAX_SERIAL_PORT2 579 ; Enable serial port 2 580 or.w IO_STATE (R_GEN_CONFIG, ser2, select),$r0 581#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT2) 582 ; DMA channels 2 and 3 to ser2, kgdb doesnt want DMA 583#if (defined(CONFIG_ETRAX_AGDB)) 584 ; agdb only wants DMA out, no dma in 585 or.d IO_STATE (R_GEN_CONFIG, dma2, serial2),$r0 586#else 587 or.d IO_STATE (R_GEN_CONFIG, dma3, serial2) \ 588 | IO_STATE (R_GEN_CONFIG, dma2, serial2),$r0 589#endif 590#endif 591#endif 592#if defined(CONFIG_ETRAX_SERIAL_PORT3) || defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) 593 ; Enable serial port 3 594 or.w IO_STATE (R_GEN_CONFIG, ser3, select),$r0 595#if !defined(CONFIG_ETRAX_KGDB) || !defined(CONFIG_ETRAX_DEBUG_PORT3) 596 ; DMA channels 4 and 5 to ser3, kgdb doesnt want DMA 597#if (defined(CONFIG_ETRAX_AGDB)) 598 ; agdb only wants DMA out, no dma in 599 or.d IO_STATE (R_GEN_CONFIG, dma4, serial3),$r0 600#else 601 or.d IO_STATE (R_GEN_CONFIG, dma5, serial3) \ 602 | IO_STATE (R_GEN_CONFIG, dma4, serial3),$r0 603#endif 604#endif 605#endif 606#if defined(CONFIG_ETRAX_PARALLEL_PORT0) || defined(CONFIG_ETRAX_ETHERNET_LPSLAVE) 607 ; parport 0 enabled using DMA 2/3 608 or.w IO_STATE (R_GEN_CONFIG, par0, select),$r0 609#endif 610#if defined(CONFIG_ETRAX_PARALLEL_PORT1) || defined(CONFIG_ETRAX_ETHERNET_LPSLAVE) 611 ; parport 1 enabled using DMA 4/5 612 or.w IO_STATE (R_GEN_CONFIG, par1, select),$r0 613#endif 614#ifdef CONFIG_ETRAX_IDE 615 ; DMA channels 2 and 3 to ATA, ATA enabled 616 or.d IO_STATE (R_GEN_CONFIG, dma3, ata) \ 617 | IO_STATE (R_GEN_CONFIG, dma2, ata) \ 618 | IO_STATE (R_GEN_CONFIG, ata, select),$r0 619#endif 620 621#ifdef CONFIG_ETRAX_USB_HOST_PORT1 622 ; Set the USB port 1 enable bit 623 or.d IO_STATE (R_GEN_CONFIG, usb1, select),$r0 624#endif 625#ifdef CONFIG_ETRAX_USB_HOST_PORT2 626 ; Set the USB port 2 enable bit 627 or.d IO_STATE (R_GEN_CONFIG, usb2, select),$r0 628#endif 629#ifdef CONFIG_ETRAX_USB_HOST 630 ; Connect DMA channels 8 and 9 to USB 631 and.d (~(IO_MASK (R_GEN_CONFIG, dma9) \ 632 | IO_MASK (R_GEN_CONFIG, dma8))) \ 633 | IO_STATE (R_GEN_CONFIG, dma9, usb) \ 634 | IO_STATE (R_GEN_CONFIG, dma8, usb),$r0 635#endif 636 637#ifdef CONFIG_JULIETTE 638 ; DMA channels 4 and 5 to EXTDMA0, for Juliette 639 or.d IO_STATE (R_GEN_CONFIG, dma5, extdma0) \ 640 | IO_STATE (R_GEN_CONFIG, dma4, extdma0),$r0 641#endif 642 643#if defined(CONFIG_BLUETOOTH) && (defined(CONFIG_BLUETOOTH_RESET_G10) || defined(CONFIG_BLUETOOTH_RESET_G11)) 644 or.d IO_STATE (R_GEN_CONFIG, g8_15dir, out),$r0 645#endif 646 647 move.d $r0,[genconfig_shadow] ; init a shadow register of R_GEN_CONFIG 648 649#ifndef CONFIG_SVINTO_SIM 650 move.d $r0,[R_GEN_CONFIG] 651 652#if 0 653 moveq 4,$r0 654 move.b $r0,[R_DMA_CH6_CMD] ; reset (ser0 dma out) 655 move.b $r0,[R_DMA_CH7_CMD] ; reset (ser0 dma in) 6561: move.b [R_DMA_CH6_CMD],$r0 ; wait for reset cycle to finish 657 and.b 7,$r0 658 cmp.b 4,$r0 659 beq 1b 660 nop 6611: move.b [R_DMA_CH7_CMD],$r0 ; wait for reset cycle to finish 662 and.b 7,$r0 663 cmp.b 4,$r0 664 beq 1b 665 nop 666#endif 667 668 moveq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0 669 move.b $r0,[R_DMA_CH8_CMD] ; reset (ser1 dma out) 670 move.b $r0,[R_DMA_CH9_CMD] ; reset (ser1 dma in) 6711: move.b [R_DMA_CH8_CMD],$r0 ; wait for reset cycle to finish 672 andq IO_MASK (R_DMA_CH8_CMD, cmd),$r0 673 cmpq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0 674 beq 1b 675 nop 6761: move.b [R_DMA_CH9_CMD],$r0 ; wait for reset cycle to finish 677 andq IO_MASK (R_DMA_CH9_CMD, cmd),$r0 678 cmpq IO_STATE (R_DMA_CH9_CMD, cmd, reset),$r0 679 beq 1b 680 nop 681 682 ;; setup port PA and PB default initial directions and data 683 ;; including their shadow registers 684 685 move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR,$r0 686#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PA7) 687 or.b IO_STATE (R_PORT_PA_DIR, dir7, output),$r0 688#endif 689 move.b $r0,[port_pa_dir_shadow] 690 move.b $r0,[R_PORT_PA_DIR] 691 move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA,$r0 692#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PA7) 693#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) 694 and.b ~(1 << 7),$r0 695#else 696 or.b (1 << 7),$r0 697#endif 698#endif 699 move.b $r0,[port_pa_data_shadow] 700 move.b $r0,[R_PORT_PA_DATA] 701 702 move.b CONFIG_ETRAX_DEF_R_PORT_PB_CONFIG,$r0 703 move.b $r0,[port_pb_config_shadow] 704 move.b $r0,[R_PORT_PB_CONFIG] 705 move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR,$r0 706#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PB5) 707 or.b IO_STATE (R_PORT_PB_DIR, dir5, output),$r0 708#endif 709 move.b $r0,[port_pb_dir_shadow] 710 move.b $r0,[R_PORT_PB_DIR] 711 move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA,$r0 712#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PB5) 713#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) 714 and.b ~(1 << 5),$r0 715#else 716 or.b (1 << 5),$r0 717#endif 718#endif 719 move.b $r0,[port_pb_data_shadow] 720 move.b $r0,[R_PORT_PB_DATA] 721 722 moveq 0, $r0 723 move.d $r0,[port_pb_i2c_shadow] 724 move.d $r0, [R_PORT_PB_I2C] 725 726 moveq 0,$r0 727#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_G10) 728#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) 729 and.d ~(1 << 10),$r0 730#else 731 or.d (1 << 10),$r0 732#endif 733#endif 734#if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_G11) 735#if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) 736 and.d ~(1 << 11),$r0 737#else 738 or.d (1 << 11),$r0 739#endif 740#endif 741 move.d $r0,[port_g_data_shadow] 742 move.d $r0,[R_PORT_G_DATA] 743 744 ;; setup the serial port 0 at 115200 baud for debug purposes 745 746 moveq IO_STATE (R_SERIAL0_XOFF, tx_stop, enable) \ 747 | IO_STATE (R_SERIAL0_XOFF, auto_xoff, disable) \ 748 | IO_FIELD (R_SERIAL0_XOFF, xoff_char, 0),$r0 749 move.d $r0,[R_SERIAL0_XOFF] 750 751 ; 115.2kbaud for both transmit and receive 752 move.b IO_STATE (R_SERIAL0_BAUD, tr_baud, c115k2Hz) \ 753 | IO_STATE (R_SERIAL0_BAUD, rec_baud, c115k2Hz),$r0 754 move.b $r0,[R_SERIAL0_BAUD] 755 756 ; Set up and enable the serial0 receiver. 757 move.b IO_STATE (R_SERIAL0_REC_CTRL, dma_err, stop) \ 758 | IO_STATE (R_SERIAL0_REC_CTRL, rec_enable, enable) \ 759 | IO_STATE (R_SERIAL0_REC_CTRL, rts_, active) \ 760 | IO_STATE (R_SERIAL0_REC_CTRL, sampling, middle) \ 761 | IO_STATE (R_SERIAL0_REC_CTRL, rec_stick_par, normal) \ 762 | IO_STATE (R_SERIAL0_REC_CTRL, rec_par, even) \ 763 | IO_STATE (R_SERIAL0_REC_CTRL, rec_par_en, disable) \ 764 | IO_STATE (R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit),$r0 765 move.b $r0,[R_SERIAL0_REC_CTRL] 766 767 ; Set up and enable the serial0 transmitter. 768 move.b IO_FIELD (R_SERIAL0_TR_CTRL, txd, 0) \ 769 | IO_STATE (R_SERIAL0_TR_CTRL, tr_enable, enable) \ 770 | IO_STATE (R_SERIAL0_TR_CTRL, auto_cts, disabled) \ 771 | IO_STATE (R_SERIAL0_TR_CTRL, stop_bits, one_bit) \ 772 | IO_STATE (R_SERIAL0_TR_CTRL, tr_stick_par, normal) \ 773 | IO_STATE (R_SERIAL0_TR_CTRL, tr_par, even) \ 774 | IO_STATE (R_SERIAL0_TR_CTRL, tr_par_en, disable) \ 775 | IO_STATE (R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit),$r0 776 move.b $r0,[R_SERIAL0_TR_CTRL] 777 778 ;; setup the serial port 1 at 115200 baud for debug purposes 779 780 moveq IO_STATE (R_SERIAL1_XOFF, tx_stop, enable) \ 781 | IO_STATE (R_SERIAL1_XOFF, auto_xoff, disable) \ 782 | IO_FIELD (R_SERIAL1_XOFF, xoff_char, 0),$r0 783 move.d $r0,[R_SERIAL1_XOFF] 784 785 ; 115.2kbaud for both transmit and receive 786 move.b IO_STATE (R_SERIAL1_BAUD, tr_baud, c115k2Hz) \ 787 | IO_STATE (R_SERIAL1_BAUD, rec_baud, c115k2Hz),$r0 788 move.b $r0,[R_SERIAL1_BAUD] 789 790 ; Set up and enable the serial1 receiver. 791 move.b IO_STATE (R_SERIAL1_REC_CTRL, dma_err, stop) \ 792 | IO_STATE (R_SERIAL1_REC_CTRL, rec_enable, enable) \ 793 | IO_STATE (R_SERIAL1_REC_CTRL, rts_, active) \ 794 | IO_STATE (R_SERIAL1_REC_CTRL, sampling, middle) \ 795 | IO_STATE (R_SERIAL1_REC_CTRL, rec_stick_par, normal) \ 796 | IO_STATE (R_SERIAL1_REC_CTRL, rec_par, even) \ 797 | IO_STATE (R_SERIAL1_REC_CTRL, rec_par_en, disable) \ 798 | IO_STATE (R_SERIAL1_REC_CTRL, rec_bitnr, rec_8bit),$r0 799 move.b $r0,[R_SERIAL1_REC_CTRL] 800 801 ; Set up and enable the serial1 transmitter. 802 move.b IO_FIELD (R_SERIAL1_TR_CTRL, txd, 0) \ 803 | IO_STATE (R_SERIAL1_TR_CTRL, tr_enable, enable) \ 804 | IO_STATE (R_SERIAL1_TR_CTRL, auto_cts, disabled) \ 805 | IO_STATE (R_SERIAL1_TR_CTRL, stop_bits, one_bit) \ 806 | IO_STATE (R_SERIAL1_TR_CTRL, tr_stick_par, normal) \ 807 | IO_STATE (R_SERIAL1_TR_CTRL, tr_par, even) \ 808 | IO_STATE (R_SERIAL1_TR_CTRL, tr_par_en, disable) \ 809 | IO_STATE (R_SERIAL1_TR_CTRL, tr_bitnr, tr_8bit),$r0 810 move.b $r0,[R_SERIAL1_TR_CTRL] 811 812 813#ifdef CONFIG_ETRAX_SERIAL_PORT3 814 ;; setup the serial port 3 at 115200 baud for debug purposes 815 816 moveq IO_STATE (R_SERIAL3_XOFF, tx_stop, enable) \ 817 | IO_STATE (R_SERIAL3_XOFF, auto_xoff, disable) \ 818 | IO_FIELD (R_SERIAL3_XOFF, xoff_char, 0),$r0 819 move.d $r0,[R_SERIAL3_XOFF] 820 821 ; 115.2kbaud for both transmit and receive 822 move.b IO_STATE (R_SERIAL3_BAUD, tr_baud, c115k2Hz) \ 823 | IO_STATE (R_SERIAL3_BAUD, rec_baud, c115k2Hz),$r0 824 move.b $r0,[R_SERIAL3_BAUD] 825 826 ; Set up and enable the serial3 receiver. 827 move.b IO_STATE (R_SERIAL3_REC_CTRL, dma_err, stop) \ 828 | IO_STATE (R_SERIAL3_REC_CTRL, rec_enable, enable) \ 829 | IO_STATE (R_SERIAL3_REC_CTRL, rts_, active) \ 830 | IO_STATE (R_SERIAL3_REC_CTRL, sampling, middle) \ 831 | IO_STATE (R_SERIAL3_REC_CTRL, rec_stick_par, normal) \ 832 | IO_STATE (R_SERIAL3_REC_CTRL, rec_par, even) \ 833 | IO_STATE (R_SERIAL3_REC_CTRL, rec_par_en, disable) \ 834 | IO_STATE (R_SERIAL3_REC_CTRL, rec_bitnr, rec_8bit),$r0 835 move.b $r0,[R_SERIAL3_REC_CTRL] 836 837 ; Set up and enable the serial3 transmitter. 838 move.b IO_FIELD (R_SERIAL3_TR_CTRL, txd, 0) \ 839 | IO_STATE (R_SERIAL3_TR_CTRL, tr_enable, enable) \ 840 | IO_STATE (R_SERIAL3_TR_CTRL, auto_cts, disabled) \ 841 | IO_STATE (R_SERIAL3_TR_CTRL, stop_bits, one_bit) \ 842 | IO_STATE (R_SERIAL3_TR_CTRL, tr_stick_par, normal) \ 843 | IO_STATE (R_SERIAL3_TR_CTRL, tr_par, even) \ 844 | IO_STATE (R_SERIAL3_TR_CTRL, tr_par_en, disable) \ 845 | IO_STATE (R_SERIAL3_TR_CTRL, tr_bitnr, tr_8bit),$r0 846 move.b $r0,[R_SERIAL3_TR_CTRL] 847#endif 848 849#endif /* CONFIG_SVINTO_SIM */ 850 851 jump start_kernel ; jump into the C-function start_kernel in init/main.c 852 853 .data 854etrax_irv: 855 .dword 0 856romfs_start: 857 .dword 0 858romfs_length: 859 .dword 0 860romfs_in_flash: 861 .dword 0 862 863 ;; put some special pages at the beginning of the kernel aligned 864 ;; to page boundaries - the kernel cannot start until after this 865 866#ifdef CONFIG_CRIS_LOW_MAP 867swapper_pg_dir = 0x60002000 868#else 869swapper_pg_dir = 0xc0002000 870#endif 871 872 .section ".data.init", "aw" 873#include "../lib/hw_settings.S" 874