Mikael Starvik | 63245d2 | 2005-07-27 11:44:35 -0700 | [diff] [blame] | 1 | /* $Id: head.S,v 1.10 2005/06/20 05:12:54 starvik Exp $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 $ |
Mikael Starvik | 63245d2 | 2005-07-27 11:44:35 -0700 | [diff] [blame] | 10 | * Revision 1.10 2005/06/20 05:12:54 starvik |
| 11 | * Remove unnecessary diff to kernel.org tree |
| 12 | * |
| 13 | * Revision 1.9 2004/12/13 12:21:51 starvik |
| 14 | * Added I/O and DMA allocators from Linux 2.4 |
| 15 | * |
| 16 | * Revision 1.8 2004/11/22 11:41:14 starvik |
| 17 | * Kernel command line may be supplied to kernel. Not used by Axis but may |
| 18 | * be used by customers. |
| 19 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * Revision 1.7 2004/05/14 07:58:01 starvik |
| 21 | * Merge of changes from 2.4 |
| 22 | * |
| 23 | * Revision 1.6 2003/04/28 05:31:46 starvik |
| 24 | * Added section attributes |
| 25 | * |
| 26 | * Revision 1.5 2002/12/11 15:42:02 starvik |
| 27 | * Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/*.c |
| 28 | * |
| 29 | * Revision 1.4 2002/11/07 09:00:44 starvik |
| 30 | * Names changed for init sections |
| 31 | * init_task_union -> init_thread_union |
| 32 | * |
| 33 | * Revision 1.3 2002/02/05 15:38:23 bjornw |
| 34 | * Oops.. non-CRAMFS_MAGIC should jump over the copying, not into it... |
| 35 | * |
| 36 | * Revision 1.2 2001/12/18 13:35:19 bjornw |
| 37 | * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15). |
| 38 | * |
| 39 | * Revision 1.43 2001/11/08 15:09:43 starvik |
| 40 | * Only start MII clock if Ethernet is configured |
| 41 | * |
| 42 | * Revision 1.42 2001/11/08 14:37:34 starvik |
| 43 | * Start MII clock early to make sure that it is running at tranceiver reset |
| 44 | * |
| 45 | * Revision 1.41 2001/10/29 14:55:58 pkj |
| 46 | * Corrected pa$r0 to par0. |
| 47 | * |
| 48 | * Revision 1.40 2001/10/03 14:59:57 pkj |
| 49 | * Added support for resetting the Bluetooth hardware. |
| 50 | * |
| 51 | * Revision 1.39 2001/10/01 14:45:03 bjornw |
| 52 | * Removed underscores and added register prefixes |
| 53 | * |
| 54 | * Revision 1.38 2001/09/21 07:14:11 jonashg |
| 55 | * Made root filesystem (cramfs) use mtdblock driver when booting from flash. |
| 56 | * |
| 57 | * Revision 1.37 2001/09/11 13:44:29 orjanf |
| 58 | * Decouple usage of serial ports for debug and kgdb. |
| 59 | * |
| 60 | * Revision 1.36 2001/06/29 12:39:31 pkj |
| 61 | * Added support for mirroring the first flash to just below the |
| 62 | * second one, to make them look consecutive to cramfs. |
| 63 | * |
| 64 | * Revision 1.35 2001/06/25 14:07:00 hp |
| 65 | * Fix review comment. |
| 66 | * * head.S: Use IO_STATE, IO_FIELD and IO_MASK constructs instead of |
| 67 | * magic numbers. Add comment that -traditional must not be used. |
| 68 | * * entry.S (SYMBOL_NAME): Change redefinition to use ## concatenation. |
| 69 | * Correct and update comment. |
| 70 | * * Makefile (.S.o): Don't use -traditional. Add comment why the |
| 71 | * toplevel rule can't be used (now that there's a reason). |
| 72 | * |
| 73 | * Revision 1.34 2001/05/15 07:08:14 hp |
| 74 | * Tweak "notice" to reflect that both r8 r9 are used |
| 75 | * |
| 76 | * Revision 1.33 2001/05/15 06:40:05 hp |
| 77 | * Put bulk of code in .text.init, data in .data.init |
| 78 | * |
| 79 | * Revision 1.32 2001/05/15 06:18:56 hp |
| 80 | * Execute review comment: s/bcc/bhs/g; s/bcs/blo/g |
| 81 | * |
| 82 | * Revision 1.31 2001/05/15 06:08:40 hp |
| 83 | * Add sentence about autodetecting the bit31-MMU-bug |
| 84 | * |
| 85 | * Revision 1.30 2001/05/15 06:00:05 hp |
| 86 | * Update comment: LOW_MAP is not forced on xsim anymore. |
| 87 | * |
| 88 | * Revision 1.29 2001/04/18 12:51:59 orjanf |
| 89 | * * Reverted review change regarding the use of bcs/bcc. |
| 90 | * * Removed non-working LED-clearing code. |
| 91 | * |
| 92 | * Revision 1.28 2001/04/17 13:58:39 orjanf |
| 93 | * * Renamed CONFIG_KGDB to CONFIG_ETRAX_KGDB. |
| 94 | * |
| 95 | * Revision 1.27 2001/04/17 11:42:35 orjanf |
| 96 | * Changed according to review: |
| 97 | * * Added comment explaining memory map bug. |
| 98 | * * Changed bcs and bcc to blo and bhs, respectively. |
| 99 | * * Removed mentioning of Stallone and Olga boards. |
| 100 | * |
| 101 | * Revision 1.26 2001/04/06 12:31:07 jonashg |
| 102 | * Check for cramfs in flash before RAM instead of RAM before flash. |
| 103 | * |
| 104 | * Revision 1.25 2001/04/04 06:23:53 starvik |
| 105 | * Initialize DRAM if not already initialized |
| 106 | * |
| 107 | * Revision 1.24 2001/04/03 11:12:00 starvik |
| 108 | * Removed dram init (done by rescue or etrax100boot |
| 109 | * Corrected include |
| 110 | * |
| 111 | * Revision 1.23 2001/04/03 09:53:03 starvik |
| 112 | * Include hw_settings.S |
| 113 | * |
| 114 | * Revision 1.22 2001/03/26 14:23:26 bjornw |
| 115 | * Namechange of some config options |
| 116 | * |
| 117 | * Revision 1.21 2001/03/08 12:14:41 bjornw |
| 118 | * * Config name for ETRAX IDE was renamed |
| 119 | * * Removed G27 auto-setting when JULIETTE is chosen (need to make this |
| 120 | * a new config option later) |
| 121 | * |
| 122 | * Revision 1.20 2001/02/23 12:47:56 bjornw |
| 123 | * MMU regs during LOW_MAP updated to reflect a newer reality |
| 124 | * |
| 125 | * Revision 1.19 2001/02/19 11:12:07 bjornw |
| 126 | * Changed comment header format |
| 127 | * |
| 128 | * Revision 1.18 2001/02/15 07:25:38 starvik |
| 129 | * Added support for synchronous serial ports |
| 130 | * |
| 131 | * Revision 1.17 2001/02/08 15:53:13 starvik |
| 132 | * Last commit removed some important ifdefs |
| 133 | * |
| 134 | * Revision 1.16 2001/02/08 15:20:38 starvik |
| 135 | * Include dram_init.S as inline |
| 136 | * |
| 137 | * Revision 1.15 2001/01/29 18:12:01 bjornw |
| 138 | * Corrected some comments |
| 139 | * |
| 140 | * Revision 1.14 2001/01/29 13:11:29 starvik |
| 141 | * Include dram_init.S (with DRAM/SDRAM initialization) |
| 142 | * |
| 143 | * Revision 1.13 2001/01/23 14:54:57 markusl |
| 144 | * Updated for USB |
| 145 | * i.e. added r_gen_config settings |
| 146 | * |
| 147 | * Revision 1.12 2001/01/19 16:16:29 perf |
| 148 | * Added temporary mapping of 0x0c->0x0c to avoid flash loading confusion. |
| 149 | * Renamed serial options from ETRAX100 to ETRAX. |
| 150 | * |
| 151 | * Revision 1.11 2001/01/16 16:31:38 bjornw |
| 152 | * * Changed name and semantics of running_from_flash to romfs_in_flash, |
| 153 | * set by head.S to indicate to setup.c whether there is a cramfs image |
| 154 | * after the kernels BSS or not. Should work for all three boot-cases |
| 155 | * (DRAM with cramfs in DRAM, DRAM with cramfs in flash (compressed boot), |
| 156 | * and flash with cramfs in flash) |
| 157 | * |
| 158 | * Revision 1.10 2001/01/16 14:12:21 bjornw |
| 159 | * * Check for cramfs start passed in r9 from the decompressor, if all other |
| 160 | * cramfs options fail (if we boot from DRAM but don't find a cramfs image |
| 161 | * after the kernel in DRAM, it is probably still in the flash) |
| 162 | * * Check magic in cramfs detection when booting from flash directly |
| 163 | * |
| 164 | * Revision 1.9 2001/01/15 17:17:02 bjornw |
| 165 | * * Corrected the code that detects the cramfs lengths |
| 166 | * * Added a comment saying that the above does not work due to other |
| 167 | * reasons.. |
| 168 | * |
| 169 | * Revision 1.8 2001/01/15 16:27:51 jonashg |
| 170 | * Made boot after flashing work. |
| 171 | * * end destination is __vmlinux_end in RAM. |
| 172 | * * _romfs_start moved because of virtual memory. |
| 173 | * |
| 174 | * Revision 1.7 2000/11/21 13:55:29 bjornw |
| 175 | * Use CONFIG_CRIS_LOW_MAP for the low VM map instead of explicit CPU type |
| 176 | * |
| 177 | * Revision 1.6 2000/10/06 12:36:55 bjornw |
| 178 | * Forgot swapper_pg_dir when changing memory map.. |
| 179 | * |
| 180 | * Revision 1.5 2000/10/04 16:49:30 bjornw |
| 181 | * * Fixed memory mapping in LX |
| 182 | * * Check for cramfs instead of romfs |
| 183 | * |
| 184 | */ |
| 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | #define ASSEMBLER_MACROS_ONLY |
| 187 | /* The IO_* macros use the ## token concatenation operator, so |
| 188 | -traditional must not be used when assembling this file. */ |
| 189 | #include <asm/arch/sv_addr_ag.h> |
| 190 | |
| 191 | #define CRAMFS_MAGIC 0x28cd3d45 |
| 192 | #define RAM_INIT_MAGIC 0x56902387 |
Mikael Starvik | 63245d2 | 2005-07-27 11:44:35 -0700 | [diff] [blame] | 193 | #define COMMAND_LINE_MAGIC 0x87109563 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | #define START_ETHERNET_CLOCK IO_STATE(R_NETWORK_GEN_CONFIG, enable, on) |\ |
| 196 | IO_STATE(R_NETWORK_GEN_CONFIG, phy, mii_clk) |
| 197 | |
| 198 | ;; exported symbols |
| 199 | |
| 200 | .globl etrax_irv |
| 201 | .globl romfs_start |
| 202 | .globl romfs_length |
| 203 | .globl romfs_in_flash |
| 204 | .globl swapper_pg_dir |
| 205 | |
| 206 | .text |
| 207 | |
| 208 | ;; This is the entry point of the kernel. We are in supervisor mode. |
| 209 | ;; 0x00000000 if Flash, 0x40004000 if DRAM |
| 210 | ;; since etrax actually starts at address 2 when booting from flash, we |
| 211 | ;; put a nop (2 bytes) here first so we dont accidentally skip the di |
| 212 | ;; |
| 213 | ;; NOTICE! The registers r8 and r9 are used as parameters carrying |
| 214 | ;; information from the decompressor (if the kernel was compressed). |
| 215 | ;; They should not be used in the code below until read. |
| 216 | |
| 217 | nop |
| 218 | di |
| 219 | |
| 220 | ;; First setup the kseg_c mapping from where the kernel is linked |
| 221 | ;; to 0x40000000 (where the actual DRAM resides) otherwise |
| 222 | ;; we cannot do very much! See arch/cris/README.mm |
| 223 | ;; |
| 224 | ;; Notice that since we're potentially running at 0x00 or 0x40 right now, |
| 225 | ;; we will get a fault as soon as we enable the MMU if we dont |
| 226 | ;; temporarily map those segments linearily. |
| 227 | ;; |
| 228 | ;; Due to a bug in Etrax-100 LX version 1 we need to map the memory |
| 229 | ;; slightly different. The bug is that you can't remap bit 31 of |
| 230 | ;; an address. Though we can check the version register for |
| 231 | ;; whether the bug is present, some constants would then have to |
| 232 | ;; be variables, so we don't. The drawback is that you can "only" map |
| 233 | ;; 1G per process with CONFIG_CRIS_LOW_MAP. |
| 234 | |
| 235 | #ifdef CONFIG_CRIS_LOW_MAP |
| 236 | ; kseg mappings, temporary map of 0xc0->0x40 |
| 237 | move.d IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \ |
| 238 | | IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb) \ |
| 239 | | IO_FIELD (R_MMU_KBASE_HI, base_9, 9) \ |
| 240 | | IO_FIELD (R_MMU_KBASE_HI, base_8, 8), $r0 |
| 241 | move.d $r0, [R_MMU_KBASE_HI] |
| 242 | |
| 243 | ; temporary map of 0x40->0x40 and 0x60->0x40 |
| 244 | move.d IO_FIELD (R_MMU_KBASE_LO, base_6, 4) \ |
| 245 | | IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0 |
| 246 | move.d $r0, [R_MMU_KBASE_LO] |
| 247 | |
| 248 | ; mmu enable, segs e,c,b,a,6,5,4,0 segment mapped |
| 249 | move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \ |
| 250 | | IO_STATE (R_MMU_CONFIG, inv_excp, enable) \ |
| 251 | | IO_STATE (R_MMU_CONFIG, acc_excp, enable) \ |
| 252 | | IO_STATE (R_MMU_CONFIG, we_excp, enable) \ |
| 253 | | IO_STATE (R_MMU_CONFIG, seg_f, page) \ |
| 254 | | IO_STATE (R_MMU_CONFIG, seg_e, seg) \ |
| 255 | | IO_STATE (R_MMU_CONFIG, seg_d, page) \ |
| 256 | | IO_STATE (R_MMU_CONFIG, seg_c, seg) \ |
| 257 | | IO_STATE (R_MMU_CONFIG, seg_b, seg) \ |
| 258 | | IO_STATE (R_MMU_CONFIG, seg_a, seg) \ |
| 259 | | IO_STATE (R_MMU_CONFIG, seg_9, page) \ |
| 260 | | IO_STATE (R_MMU_CONFIG, seg_8, page) \ |
| 261 | | IO_STATE (R_MMU_CONFIG, seg_7, page) \ |
| 262 | | IO_STATE (R_MMU_CONFIG, seg_6, seg) \ |
| 263 | | IO_STATE (R_MMU_CONFIG, seg_5, seg) \ |
| 264 | | IO_STATE (R_MMU_CONFIG, seg_4, seg) \ |
| 265 | | IO_STATE (R_MMU_CONFIG, seg_3, page) \ |
| 266 | | IO_STATE (R_MMU_CONFIG, seg_2, page) \ |
| 267 | | IO_STATE (R_MMU_CONFIG, seg_1, page) \ |
| 268 | | IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0 |
| 269 | move.d $r0, [R_MMU_CONFIG] |
| 270 | #else |
| 271 | ; kseg mappings |
| 272 | move.d IO_FIELD (R_MMU_KBASE_HI, base_e, 8) \ |
| 273 | | IO_FIELD (R_MMU_KBASE_HI, base_c, 4) \ |
| 274 | | IO_FIELD (R_MMU_KBASE_HI, base_b, 0xb), $r0 |
| 275 | move.d $r0, [R_MMU_KBASE_HI] |
| 276 | |
| 277 | ; temporary map of 0x40->0x40 and 0x00->0x00 |
| 278 | move.d IO_FIELD (R_MMU_KBASE_LO, base_4, 4), $r0 |
| 279 | move.d $r0, [R_MMU_KBASE_LO] |
| 280 | |
| 281 | ; mmu enable, segs f,e,c,b,4,0 segment mapped |
| 282 | move.d IO_STATE (R_MMU_CONFIG, mmu_enable, enable) \ |
| 283 | | IO_STATE (R_MMU_CONFIG, inv_excp, enable) \ |
| 284 | | IO_STATE (R_MMU_CONFIG, acc_excp, enable) \ |
| 285 | | IO_STATE (R_MMU_CONFIG, we_excp, enable) \ |
| 286 | | IO_STATE (R_MMU_CONFIG, seg_f, seg) \ |
| 287 | | IO_STATE (R_MMU_CONFIG, seg_e, seg) \ |
| 288 | | IO_STATE (R_MMU_CONFIG, seg_d, page) \ |
| 289 | | IO_STATE (R_MMU_CONFIG, seg_c, seg) \ |
| 290 | | IO_STATE (R_MMU_CONFIG, seg_b, seg) \ |
| 291 | | IO_STATE (R_MMU_CONFIG, seg_a, page) \ |
| 292 | | IO_STATE (R_MMU_CONFIG, seg_9, page) \ |
| 293 | | IO_STATE (R_MMU_CONFIG, seg_8, page) \ |
| 294 | | IO_STATE (R_MMU_CONFIG, seg_7, page) \ |
| 295 | | IO_STATE (R_MMU_CONFIG, seg_6, page) \ |
| 296 | | IO_STATE (R_MMU_CONFIG, seg_5, page) \ |
| 297 | | IO_STATE (R_MMU_CONFIG, seg_4, seg) \ |
| 298 | | IO_STATE (R_MMU_CONFIG, seg_3, page) \ |
| 299 | | IO_STATE (R_MMU_CONFIG, seg_2, page) \ |
| 300 | | IO_STATE (R_MMU_CONFIG, seg_1, page) \ |
| 301 | | IO_STATE (R_MMU_CONFIG, seg_0, seg), $r0 |
| 302 | move.d $r0, [R_MMU_CONFIG] |
| 303 | #endif |
| 304 | |
| 305 | ;; Now we need to sort out the segments and their locations in RAM or |
| 306 | ;; Flash. The image in the Flash (or in DRAM) consists of 3 pieces: |
| 307 | ;; 1) kernel text, 2) kernel data, 3) ROM filesystem image |
| 308 | ;; But the linker has linked the kernel to expect this layout in |
| 309 | ;; DRAM memory: |
| 310 | ;; 1) kernel text, 2) kernel data, 3) kernel BSS |
| 311 | ;; (the location of the ROM filesystem is determined by the krom driver) |
| 312 | ;; If we boot this from Flash, we want to keep the ROM filesystem in |
| 313 | ;; the flash, we want to copy the text and need to copy the data to DRAM. |
| 314 | ;; But if we boot from DRAM, we need to move the ROMFS image |
| 315 | ;; from its position after kernel data, to after kernel BSS, BEFORE the |
| 316 | ;; kernel starts using the BSS area (since its "overlayed" with the ROMFS) |
| 317 | ;; |
| 318 | ;; In both cases, we start in un-cached mode, and need to jump into a |
| 319 | ;; cached PC after we're done fiddling around with the segments. |
| 320 | ;; |
| 321 | ;; arch/etrax100/etrax100.ld sets some symbols that define the start |
| 322 | ;; and end of each segment. |
| 323 | |
| 324 | ;; Check if we start from DRAM or FLASH by testing PC |
| 325 | |
| 326 | move.d $pc,$r0 |
| 327 | and.d 0x7fffffff,$r0 ; get rid of the non-cache bit |
| 328 | cmp.d 0x10000,$r0 ; arbitrary... just something above this code |
| 329 | blo _inflash0 |
| 330 | nop |
| 331 | |
| 332 | jump _inram ; enter cached ram |
| 333 | |
| 334 | ;; Jumpgate for branches. |
| 335 | _inflash0: |
| 336 | jump _inflash |
| 337 | |
| 338 | ;; Put this in a suitable section where we can reclaim storage |
| 339 | ;; after init. |
| 340 | .section ".init.text", "ax" |
| 341 | _inflash: |
| 342 | #ifdef CONFIG_ETRAX_ETHERNET |
| 343 | ;; Start MII clock to make sure it is running when tranceiver is reset |
| 344 | move.d START_ETHERNET_CLOCK, $r0 |
| 345 | move.d $r0, [R_NETWORK_GEN_CONFIG] |
| 346 | #endif |
| 347 | |
| 348 | ;; Set up waitstates etc according to kernel configuration. |
| 349 | #ifndef CONFIG_SVINTO_SIM |
| 350 | move.d CONFIG_ETRAX_DEF_R_WAITSTATES, $r0 |
| 351 | move.d $r0, [R_WAITSTATES] |
| 352 | |
| 353 | move.d CONFIG_ETRAX_DEF_R_BUS_CONFIG, $r0 |
| 354 | move.d $r0, [R_BUS_CONFIG] |
| 355 | #endif |
| 356 | |
| 357 | ;; We need to initialze DRAM registers before we start using the DRAM |
| 358 | |
| 359 | cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized? |
| 360 | beq _dram_init_finished |
| 361 | nop |
| 362 | |
| 363 | #include "../lib/dram_init.S" |
| 364 | |
| 365 | _dram_init_finished: |
| 366 | ;; Copy text+data to DRAM |
| 367 | ;; This is fragile - the calculation of r4 as the image size depends |
| 368 | ;; on that the labels below actually are the first and last positions |
| 369 | ;; in the linker-script. |
| 370 | ;; |
| 371 | ;; Then the locating of the cramfs image depends on the aforementioned |
| 372 | ;; image being located in the flash at 0. This is most often not true, |
| 373 | ;; thus the following does not work (normally there is a rescue-block |
| 374 | ;; between the physical start of the flash and the flash-image start, |
| 375 | ;; and when run with compression, the kernel is actually unpacked to |
| 376 | ;; DRAM and we never get here in the first place :)) |
| 377 | |
| 378 | moveq 0, $r0 ; source |
| 379 | move.d text_start, $r1 ; destination |
| 380 | move.d __vmlinux_end, $r2 ; end destination |
| 381 | move.d $r2, $r4 |
| 382 | sub.d $r1, $r4 ; r4=__vmlinux_end in flash, used below |
| 383 | 1: move.w [$r0+], $r3 |
| 384 | move.w $r3, [$r1+] |
| 385 | cmp.d $r2, $r1 |
| 386 | blo 1b |
| 387 | nop |
| 388 | |
| 389 | ;; We keep the cramfs in the flash. |
| 390 | ;; There might be none, but that does not matter because |
| 391 | ;; we don't do anything than read some bytes here. |
| 392 | |
| 393 | moveq 0, $r0 |
| 394 | move.d $r0, [romfs_length] ; default if there is no cramfs |
| 395 | |
| 396 | move.d [$r4], $r0 ; cramfs_super.magic |
| 397 | cmp.d CRAMFS_MAGIC, $r0 |
| 398 | bne 1f |
| 399 | nop |
| 400 | move.d [$r4 + 4], $r0 ; cramfs_super.size |
| 401 | move.d $r0, [romfs_length] |
| 402 | #ifdef CONFIG_CRIS_LOW_MAP |
| 403 | add.d 0x50000000, $r4 ; add flash start in virtual memory (cached) |
| 404 | #else |
| 405 | add.d 0xf0000000, $r4 ; add flash start in virtual memory (cached) |
| 406 | #endif |
| 407 | move.d $r4, [romfs_start] |
| 408 | 1: |
| 409 | moveq 1, $r0 |
| 410 | move.d $r0, [romfs_in_flash] |
| 411 | |
| 412 | jump _start_it ; enter code, cached this time |
| 413 | |
| 414 | _inram: |
| 415 | ;; Move the ROM fs to after BSS end. This assumes that the cramfs |
| 416 | ;; second longword contains the length of the cramfs |
| 417 | |
| 418 | moveq 0, $r0 |
| 419 | move.d $r0, [romfs_length] ; default if there is no cramfs |
| 420 | |
| 421 | ;; The kernel could have been unpacked to DRAM by the loader, but |
| 422 | ;; the cramfs image could still be in the Flash directly after the |
| 423 | ;; compressed kernel image. The loader passes the address of the |
| 424 | ;; byte succeeding the last compressed byte in the flash in the |
| 425 | ;; register r9 when starting the kernel. Check if r9 points to a |
| 426 | ;; decent cramfs image! |
| 427 | ;; (Notice that if this is not booted from the loader, r9 will be |
| 428 | ;; garbage but we do sanity checks on it, the chance that it points |
| 429 | ;; to a cramfs magic is small.. ) |
| 430 | |
| 431 | cmp.d 0x0ffffff8, $r9 |
| 432 | bhs _no_romfs_in_flash ; r9 points outside the flash area |
| 433 | nop |
| 434 | move.d [$r9], $r0 ; cramfs_super.magic |
| 435 | cmp.d CRAMFS_MAGIC, $r0 |
| 436 | bne _no_romfs_in_flash |
| 437 | nop |
| 438 | move.d [$r9+4], $r0 ; cramfs_super.length |
| 439 | move.d $r0, [romfs_length] |
| 440 | #ifdef CONFIG_CRIS_LOW_MAP |
| 441 | add.d 0x50000000, $r9 ; add flash start in virtual memory (cached) |
| 442 | #else |
| 443 | add.d 0xf0000000, $r9 ; add flash start in virtual memory (cached) |
| 444 | #endif |
| 445 | move.d $r9, [romfs_start] |
| 446 | |
| 447 | moveq 1, $r0 |
| 448 | move.d $r0, [romfs_in_flash] |
| 449 | |
| 450 | jump _start_it ; enter code, cached this time |
| 451 | |
| 452 | _no_romfs_in_flash: |
| 453 | |
| 454 | ;; Check if there is a cramfs (magic value). |
| 455 | ;; Notice that we check for cramfs magic value - which is |
| 456 | ;; the "rom fs" we'll possibly use in 2.4 if not JFFS (which does |
| 457 | ;; not need this mechanism anyway) |
| 458 | |
| 459 | move.d __vmlinux_end, $r0; the image will be after the vmlinux end address |
| 460 | move.d [$r0], $r1 ; cramfs assumes same endian on host/target |
| 461 | cmp.d CRAMFS_MAGIC, $r1; magic value in cramfs superblock |
| 462 | bne 2f |
| 463 | nop |
| 464 | |
| 465 | ;; Ok. What is its size ? |
| 466 | |
| 467 | move.d [$r0 + 4], $r2 ; cramfs_super.size (again, no need to swapwb) |
| 468 | |
| 469 | ;; We want to copy it to the end of the BSS |
| 470 | |
| 471 | move.d _end, $r1 |
| 472 | |
| 473 | ;; Remember values so cramfs and setup can find this info |
| 474 | |
| 475 | move.d $r1, [romfs_start] ; new romfs location |
| 476 | move.d $r2, [romfs_length] |
| 477 | |
| 478 | ;; We need to copy it backwards, since they can be overlapping |
| 479 | |
| 480 | add.d $r2, $r0 |
| 481 | add.d $r2, $r1 |
| 482 | |
| 483 | ;; Go ahead. Make my loop. |
| 484 | |
| 485 | lsrq 1, $r2 ; size is in bytes, we copy words |
| 486 | |
| 487 | 1: move.w [$r0=$r0-2],$r3 |
| 488 | move.w $r3,[$r1=$r1-2] |
| 489 | subq 1, $r2 |
| 490 | bne 1b |
| 491 | nop |
| 492 | |
| 493 | 2: |
| 494 | ;; Dont worry that the BSS is tainted. It will be cleared later. |
| 495 | |
| 496 | moveq 0, $r0 |
| 497 | move.d $r0, [romfs_in_flash] |
| 498 | |
| 499 | jump _start_it ; better skip the additional cramfs check below |
| 500 | |
| 501 | _start_it: |
| 502 | |
Mikael Starvik | 63245d2 | 2005-07-27 11:44:35 -0700 | [diff] [blame] | 503 | ;; Check if kernel command line is supplied |
| 504 | cmp.d COMMAND_LINE_MAGIC, $r10 |
| 505 | bne no_command_line |
| 506 | nop |
| 507 | |
| 508 | move.d 256, $r13 |
| 509 | move.d cris_command_line, $r10 |
| 510 | or.d 0x80000000, $r11 ; Make it virtual |
| 511 | 1: |
| 512 | move.b [$r11+], $r12 |
| 513 | move.b $r12, [$r10+] |
| 514 | subq 1, $r13 |
| 515 | bne 1b |
| 516 | nop |
| 517 | |
| 518 | no_command_line: |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | ;; the kernel stack is overlayed with the task structure for each |
| 521 | ;; task. thus the initial kernel stack is in the same page as the |
| 522 | ;; init_task (but starts in the top of the page, size 8192) |
| 523 | move.d init_thread_union + 8192, $sp |
| 524 | move.d ibr_start,$r0 ; this symbol is set by the linker script |
| 525 | move $r0,$ibr |
| 526 | move.d $r0,[etrax_irv] ; set the interrupt base register and pointer |
| 527 | |
| 528 | ;; Clear BSS region, from _bss_start to _end |
| 529 | |
| 530 | move.d __bss_start, $r0 |
| 531 | move.d _end, $r1 |
| 532 | 1: clear.d [$r0+] |
| 533 | cmp.d $r1, $r0 |
| 534 | blo 1b |
| 535 | nop |
| 536 | |
| 537 | #ifdef CONFIG_BLK_DEV_ETRAXIDE |
| 538 | ;; disable ATA before enabling it in genconfig below |
| 539 | moveq 0,$r0 |
| 540 | move.d $r0,[R_ATA_CTRL_DATA] |
| 541 | move.d $r0,[R_ATA_TRANSFER_CNT] |
| 542 | move.d $r0,[R_ATA_CONFIG] |
| 543 | #if 0 |
| 544 | move.d R_PORT_G_DATA, $r1 |
| 545 | move.d $r0, [$r1]; assert ATA bus-reset |
| 546 | nop |
| 547 | nop |
| 548 | nop |
| 549 | nop |
| 550 | nop |
| 551 | nop |
| 552 | move.d 0x08000000,$r0 |
| 553 | move.d $r0,[$r1] |
| 554 | #endif |
| 555 | #endif |
| 556 | |
| 557 | #ifdef CONFIG_JULIETTE |
| 558 | ;; configure external DMA channel 0 before enabling it in genconfig |
| 559 | |
| 560 | moveq 0,$r0 |
| 561 | move.d $r0,[R_EXT_DMA_0_ADDR] |
| 562 | ; cnt enable, word size, output, stop, size 0 |
| 563 | move.d IO_STATE (R_EXT_DMA_0_CMD, cnt, enable) \ |
| 564 | | IO_STATE (R_EXT_DMA_0_CMD, rqpol, ahigh) \ |
| 565 | | IO_STATE (R_EXT_DMA_0_CMD, apol, ahigh) \ |
| 566 | | IO_STATE (R_EXT_DMA_0_CMD, rq_ack, burst) \ |
| 567 | | IO_STATE (R_EXT_DMA_0_CMD, wid, word) \ |
| 568 | | IO_STATE (R_EXT_DMA_0_CMD, dir, output) \ |
| 569 | | IO_STATE (R_EXT_DMA_0_CMD, run, stop) \ |
| 570 | | IO_FIELD (R_EXT_DMA_0_CMD, trf_count, 0),$r0 |
| 571 | move.d $r0,[R_EXT_DMA_0_CMD] |
| 572 | |
| 573 | ;; reset dma4 and wait for completion |
| 574 | |
| 575 | moveq IO_STATE (R_DMA_CH4_CMD, cmd, reset),$r0 |
| 576 | move.b $r0,[R_DMA_CH4_CMD] |
| 577 | 1: move.b [R_DMA_CH4_CMD],$r0 |
| 578 | and.b IO_MASK (R_DMA_CH4_CMD, cmd),$r0 |
| 579 | cmp.b IO_STATE (R_DMA_CH4_CMD, cmd, reset),$r0 |
| 580 | beq 1b |
| 581 | nop |
| 582 | |
| 583 | ;; reset dma5 and wait for completion |
| 584 | |
| 585 | moveq IO_STATE (R_DMA_CH5_CMD, cmd, reset),$r0 |
| 586 | move.b $r0,[R_DMA_CH5_CMD] |
| 587 | 1: move.b [R_DMA_CH5_CMD],$r0 |
| 588 | and.b IO_MASK (R_DMA_CH5_CMD, cmd),$r0 |
| 589 | cmp.b IO_STATE (R_DMA_CH5_CMD, cmd, reset),$r0 |
| 590 | beq 1b |
| 591 | nop |
| 592 | #endif |
| 593 | |
| 594 | ;; Etrax product HW genconfig setup |
| 595 | |
| 596 | moveq 0,$r0 |
Mikael Starvik | 63245d2 | 2005-07-27 11:44:35 -0700 | [diff] [blame] | 597 | |
| 598 | ;; Init interfaces (disable them). |
| 599 | or.d IO_STATE (R_GEN_CONFIG, scsi0, disable) \ |
| 600 | | IO_STATE (R_GEN_CONFIG, ata, disable) \ |
| 601 | | IO_STATE (R_GEN_CONFIG, par0, disable) \ |
| 602 | | IO_STATE (R_GEN_CONFIG, ser2, disable) \ |
| 603 | | IO_STATE (R_GEN_CONFIG, mio, disable) \ |
| 604 | | IO_STATE (R_GEN_CONFIG, scsi1, disable) \ |
| 605 | | IO_STATE (R_GEN_CONFIG, scsi0w, disable) \ |
| 606 | | IO_STATE (R_GEN_CONFIG, par1, disable) \ |
| 607 | | IO_STATE (R_GEN_CONFIG, ser3, disable) \ |
| 608 | | IO_STATE (R_GEN_CONFIG, mio_w, disable) \ |
| 609 | | IO_STATE (R_GEN_CONFIG, usb1, disable) \ |
| 610 | | IO_STATE (R_GEN_CONFIG, usb2, disable) \ |
| 611 | | IO_STATE (R_GEN_CONFIG, par_w, disable),$r0 |
| 612 | |
| 613 | ;; Init DMA channel muxing (set to unused clients). |
| 614 | or.d IO_STATE (R_GEN_CONFIG, dma2, ata) \ |
| 615 | | IO_STATE (R_GEN_CONFIG, dma3, ata) \ |
| 616 | | IO_STATE (R_GEN_CONFIG, dma4, scsi1) \ |
| 617 | | IO_STATE (R_GEN_CONFIG, dma5, scsi1) \ |
| 618 | | IO_STATE (R_GEN_CONFIG, dma6, unused) \ |
| 619 | | IO_STATE (R_GEN_CONFIG, dma7, unused) \ |
| 620 | | IO_STATE (R_GEN_CONFIG, dma8, usb) \ |
| 621 | | IO_STATE (R_GEN_CONFIG, dma9, usb),$r0 |
| 622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
| 624 | #if defined(CONFIG_ETRAX_DEF_R_PORT_G0_DIR_OUT) |
| 625 | or.d IO_STATE (R_GEN_CONFIG, g0dir, out),$r0 |
| 626 | #endif |
| 627 | |
| 628 | #if defined(CONFIG_ETRAX_DEF_R_PORT_G8_15_DIR_OUT) |
| 629 | or.d IO_STATE (R_GEN_CONFIG, g8_15dir, out),$r0 |
| 630 | #endif |
| 631 | #if defined(CONFIG_ETRAX_DEF_R_PORT_G16_23_DIR_OUT) |
| 632 | or.d IO_STATE (R_GEN_CONFIG, g16_23dir, out),$r0 |
| 633 | #endif |
| 634 | |
| 635 | #if defined(CONFIG_ETRAX_DEF_R_PORT_G24_DIR_OUT) |
| 636 | or.d IO_STATE (R_GEN_CONFIG, g24dir, out),$r0 |
| 637 | #endif |
| 638 | |
| 639 | move.d $r0,[genconfig_shadow] ; init a shadow register of R_GEN_CONFIG |
| 640 | |
| 641 | #ifndef CONFIG_SVINTO_SIM |
| 642 | move.d $r0,[R_GEN_CONFIG] |
| 643 | |
| 644 | #if 0 |
| 645 | moveq 4,$r0 |
| 646 | move.b $r0,[R_DMA_CH6_CMD] ; reset (ser0 dma out) |
| 647 | move.b $r0,[R_DMA_CH7_CMD] ; reset (ser0 dma in) |
| 648 | 1: move.b [R_DMA_CH6_CMD],$r0 ; wait for reset cycle to finish |
| 649 | and.b 7,$r0 |
| 650 | cmp.b 4,$r0 |
| 651 | beq 1b |
| 652 | nop |
| 653 | 1: move.b [R_DMA_CH7_CMD],$r0 ; wait for reset cycle to finish |
| 654 | and.b 7,$r0 |
| 655 | cmp.b 4,$r0 |
| 656 | beq 1b |
| 657 | nop |
| 658 | #endif |
| 659 | |
| 660 | moveq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0 |
| 661 | move.b $r0,[R_DMA_CH8_CMD] ; reset (ser1 dma out) |
| 662 | move.b $r0,[R_DMA_CH9_CMD] ; reset (ser1 dma in) |
| 663 | 1: move.b [R_DMA_CH8_CMD],$r0 ; wait for reset cycle to finish |
| 664 | andq IO_MASK (R_DMA_CH8_CMD, cmd),$r0 |
| 665 | cmpq IO_STATE (R_DMA_CH8_CMD, cmd, reset),$r0 |
| 666 | beq 1b |
| 667 | nop |
| 668 | 1: move.b [R_DMA_CH9_CMD],$r0 ; wait for reset cycle to finish |
| 669 | andq IO_MASK (R_DMA_CH9_CMD, cmd),$r0 |
| 670 | cmpq IO_STATE (R_DMA_CH9_CMD, cmd, reset),$r0 |
| 671 | beq 1b |
| 672 | nop |
| 673 | |
| 674 | ;; setup port PA and PB default initial directions and data |
| 675 | ;; including their shadow registers |
| 676 | |
| 677 | move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR,$r0 |
| 678 | #if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PA7) |
| 679 | or.b IO_STATE (R_PORT_PA_DIR, dir7, output),$r0 |
| 680 | #endif |
| 681 | move.b $r0,[port_pa_dir_shadow] |
| 682 | move.b $r0,[R_PORT_PA_DIR] |
| 683 | move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA,$r0 |
| 684 | #if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PA7) |
| 685 | #if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) |
| 686 | and.b ~(1 << 7),$r0 |
| 687 | #else |
| 688 | or.b (1 << 7),$r0 |
| 689 | #endif |
| 690 | #endif |
| 691 | move.b $r0,[port_pa_data_shadow] |
| 692 | move.b $r0,[R_PORT_PA_DATA] |
| 693 | |
| 694 | move.b CONFIG_ETRAX_DEF_R_PORT_PB_CONFIG,$r0 |
| 695 | move.b $r0,[port_pb_config_shadow] |
| 696 | move.b $r0,[R_PORT_PB_CONFIG] |
| 697 | move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR,$r0 |
| 698 | #if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PB5) |
| 699 | or.b IO_STATE (R_PORT_PB_DIR, dir5, output),$r0 |
| 700 | #endif |
| 701 | move.b $r0,[port_pb_dir_shadow] |
| 702 | move.b $r0,[R_PORT_PB_DIR] |
| 703 | move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA,$r0 |
| 704 | #if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_PB5) |
| 705 | #if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) |
| 706 | and.b ~(1 << 5),$r0 |
| 707 | #else |
| 708 | or.b (1 << 5),$r0 |
| 709 | #endif |
| 710 | #endif |
| 711 | move.b $r0,[port_pb_data_shadow] |
| 712 | move.b $r0,[R_PORT_PB_DATA] |
| 713 | |
| 714 | moveq 0, $r0 |
| 715 | move.d $r0,[port_pb_i2c_shadow] |
| 716 | move.d $r0, [R_PORT_PB_I2C] |
| 717 | |
| 718 | moveq 0,$r0 |
| 719 | #if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_G10) |
| 720 | #if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) |
| 721 | and.d ~(1 << 10),$r0 |
| 722 | #else |
| 723 | or.d (1 << 10),$r0 |
| 724 | #endif |
| 725 | #endif |
| 726 | #if defined(CONFIG_BLUETOOTH) && defined(CONFIG_BLUETOOTH_RESET_G11) |
| 727 | #if defined(CONFIG_BLUETOOTH_RESET_ACTIVE_HIGH) |
| 728 | and.d ~(1 << 11),$r0 |
| 729 | #else |
| 730 | or.d (1 << 11),$r0 |
| 731 | #endif |
| 732 | #endif |
| 733 | move.d $r0,[port_g_data_shadow] |
| 734 | move.d $r0,[R_PORT_G_DATA] |
| 735 | |
| 736 | ;; setup the serial port 0 at 115200 baud for debug purposes |
| 737 | |
| 738 | moveq IO_STATE (R_SERIAL0_XOFF, tx_stop, enable) \ |
| 739 | | IO_STATE (R_SERIAL0_XOFF, auto_xoff, disable) \ |
| 740 | | IO_FIELD (R_SERIAL0_XOFF, xoff_char, 0),$r0 |
| 741 | move.d $r0,[R_SERIAL0_XOFF] |
| 742 | |
| 743 | ; 115.2kbaud for both transmit and receive |
| 744 | move.b IO_STATE (R_SERIAL0_BAUD, tr_baud, c115k2Hz) \ |
| 745 | | IO_STATE (R_SERIAL0_BAUD, rec_baud, c115k2Hz),$r0 |
| 746 | move.b $r0,[R_SERIAL0_BAUD] |
| 747 | |
| 748 | ; Set up and enable the serial0 receiver. |
| 749 | move.b IO_STATE (R_SERIAL0_REC_CTRL, dma_err, stop) \ |
| 750 | | IO_STATE (R_SERIAL0_REC_CTRL, rec_enable, enable) \ |
| 751 | | IO_STATE (R_SERIAL0_REC_CTRL, rts_, active) \ |
| 752 | | IO_STATE (R_SERIAL0_REC_CTRL, sampling, middle) \ |
| 753 | | IO_STATE (R_SERIAL0_REC_CTRL, rec_stick_par, normal) \ |
| 754 | | IO_STATE (R_SERIAL0_REC_CTRL, rec_par, even) \ |
| 755 | | IO_STATE (R_SERIAL0_REC_CTRL, rec_par_en, disable) \ |
| 756 | | IO_STATE (R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit),$r0 |
| 757 | move.b $r0,[R_SERIAL0_REC_CTRL] |
| 758 | |
| 759 | ; Set up and enable the serial0 transmitter. |
| 760 | move.b IO_FIELD (R_SERIAL0_TR_CTRL, txd, 0) \ |
| 761 | | IO_STATE (R_SERIAL0_TR_CTRL, tr_enable, enable) \ |
| 762 | | IO_STATE (R_SERIAL0_TR_CTRL, auto_cts, disabled) \ |
| 763 | | IO_STATE (R_SERIAL0_TR_CTRL, stop_bits, one_bit) \ |
| 764 | | IO_STATE (R_SERIAL0_TR_CTRL, tr_stick_par, normal) \ |
| 765 | | IO_STATE (R_SERIAL0_TR_CTRL, tr_par, even) \ |
| 766 | | IO_STATE (R_SERIAL0_TR_CTRL, tr_par_en, disable) \ |
| 767 | | IO_STATE (R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit),$r0 |
| 768 | move.b $r0,[R_SERIAL0_TR_CTRL] |
| 769 | |
| 770 | ;; setup the serial port 1 at 115200 baud for debug purposes |
| 771 | |
| 772 | moveq IO_STATE (R_SERIAL1_XOFF, tx_stop, enable) \ |
| 773 | | IO_STATE (R_SERIAL1_XOFF, auto_xoff, disable) \ |
| 774 | | IO_FIELD (R_SERIAL1_XOFF, xoff_char, 0),$r0 |
| 775 | move.d $r0,[R_SERIAL1_XOFF] |
| 776 | |
| 777 | ; 115.2kbaud for both transmit and receive |
| 778 | move.b IO_STATE (R_SERIAL1_BAUD, tr_baud, c115k2Hz) \ |
| 779 | | IO_STATE (R_SERIAL1_BAUD, rec_baud, c115k2Hz),$r0 |
| 780 | move.b $r0,[R_SERIAL1_BAUD] |
| 781 | |
| 782 | ; Set up and enable the serial1 receiver. |
| 783 | move.b IO_STATE (R_SERIAL1_REC_CTRL, dma_err, stop) \ |
| 784 | | IO_STATE (R_SERIAL1_REC_CTRL, rec_enable, enable) \ |
| 785 | | IO_STATE (R_SERIAL1_REC_CTRL, rts_, active) \ |
| 786 | | IO_STATE (R_SERIAL1_REC_CTRL, sampling, middle) \ |
| 787 | | IO_STATE (R_SERIAL1_REC_CTRL, rec_stick_par, normal) \ |
| 788 | | IO_STATE (R_SERIAL1_REC_CTRL, rec_par, even) \ |
| 789 | | IO_STATE (R_SERIAL1_REC_CTRL, rec_par_en, disable) \ |
| 790 | | IO_STATE (R_SERIAL1_REC_CTRL, rec_bitnr, rec_8bit),$r0 |
| 791 | move.b $r0,[R_SERIAL1_REC_CTRL] |
| 792 | |
| 793 | ; Set up and enable the serial1 transmitter. |
| 794 | move.b IO_FIELD (R_SERIAL1_TR_CTRL, txd, 0) \ |
| 795 | | IO_STATE (R_SERIAL1_TR_CTRL, tr_enable, enable) \ |
| 796 | | IO_STATE (R_SERIAL1_TR_CTRL, auto_cts, disabled) \ |
| 797 | | IO_STATE (R_SERIAL1_TR_CTRL, stop_bits, one_bit) \ |
| 798 | | IO_STATE (R_SERIAL1_TR_CTRL, tr_stick_par, normal) \ |
| 799 | | IO_STATE (R_SERIAL1_TR_CTRL, tr_par, even) \ |
| 800 | | IO_STATE (R_SERIAL1_TR_CTRL, tr_par_en, disable) \ |
| 801 | | IO_STATE (R_SERIAL1_TR_CTRL, tr_bitnr, tr_8bit),$r0 |
| 802 | move.b $r0,[R_SERIAL1_TR_CTRL] |
| 803 | |
| 804 | |
| 805 | #ifdef CONFIG_ETRAX_SERIAL_PORT3 |
| 806 | ;; setup the serial port 3 at 115200 baud for debug purposes |
| 807 | |
| 808 | moveq IO_STATE (R_SERIAL3_XOFF, tx_stop, enable) \ |
| 809 | | IO_STATE (R_SERIAL3_XOFF, auto_xoff, disable) \ |
| 810 | | IO_FIELD (R_SERIAL3_XOFF, xoff_char, 0),$r0 |
| 811 | move.d $r0,[R_SERIAL3_XOFF] |
| 812 | |
| 813 | ; 115.2kbaud for both transmit and receive |
| 814 | move.b IO_STATE (R_SERIAL3_BAUD, tr_baud, c115k2Hz) \ |
| 815 | | IO_STATE (R_SERIAL3_BAUD, rec_baud, c115k2Hz),$r0 |
| 816 | move.b $r0,[R_SERIAL3_BAUD] |
| 817 | |
| 818 | ; Set up and enable the serial3 receiver. |
| 819 | move.b IO_STATE (R_SERIAL3_REC_CTRL, dma_err, stop) \ |
| 820 | | IO_STATE (R_SERIAL3_REC_CTRL, rec_enable, enable) \ |
| 821 | | IO_STATE (R_SERIAL3_REC_CTRL, rts_, active) \ |
| 822 | | IO_STATE (R_SERIAL3_REC_CTRL, sampling, middle) \ |
| 823 | | IO_STATE (R_SERIAL3_REC_CTRL, rec_stick_par, normal) \ |
| 824 | | IO_STATE (R_SERIAL3_REC_CTRL, rec_par, even) \ |
| 825 | | IO_STATE (R_SERIAL3_REC_CTRL, rec_par_en, disable) \ |
| 826 | | IO_STATE (R_SERIAL3_REC_CTRL, rec_bitnr, rec_8bit),$r0 |
| 827 | move.b $r0,[R_SERIAL3_REC_CTRL] |
| 828 | |
| 829 | ; Set up and enable the serial3 transmitter. |
| 830 | move.b IO_FIELD (R_SERIAL3_TR_CTRL, txd, 0) \ |
| 831 | | IO_STATE (R_SERIAL3_TR_CTRL, tr_enable, enable) \ |
| 832 | | IO_STATE (R_SERIAL3_TR_CTRL, auto_cts, disabled) \ |
| 833 | | IO_STATE (R_SERIAL3_TR_CTRL, stop_bits, one_bit) \ |
| 834 | | IO_STATE (R_SERIAL3_TR_CTRL, tr_stick_par, normal) \ |
| 835 | | IO_STATE (R_SERIAL3_TR_CTRL, tr_par, even) \ |
| 836 | | IO_STATE (R_SERIAL3_TR_CTRL, tr_par_en, disable) \ |
| 837 | | IO_STATE (R_SERIAL3_TR_CTRL, tr_bitnr, tr_8bit),$r0 |
| 838 | move.b $r0,[R_SERIAL3_TR_CTRL] |
| 839 | #endif |
| 840 | |
| 841 | #endif /* CONFIG_SVINTO_SIM */ |
| 842 | |
| 843 | jump start_kernel ; jump into the C-function start_kernel in init/main.c |
| 844 | |
| 845 | .data |
| 846 | etrax_irv: |
| 847 | .dword 0 |
| 848 | romfs_start: |
| 849 | .dword 0 |
| 850 | romfs_length: |
| 851 | .dword 0 |
| 852 | romfs_in_flash: |
| 853 | .dword 0 |
| 854 | |
| 855 | ;; put some special pages at the beginning of the kernel aligned |
| 856 | ;; to page boundaries - the kernel cannot start until after this |
| 857 | |
| 858 | #ifdef CONFIG_CRIS_LOW_MAP |
| 859 | swapper_pg_dir = 0x60002000 |
| 860 | #else |
| 861 | swapper_pg_dir = 0xc0002000 |
| 862 | #endif |
| 863 | |
| 864 | .section ".init.data", "aw" |
| 865 | #include "../lib/hw_settings.S" |