Commit | Line | Data |
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2f9ea1bd SM |
1 | /* |
2 | * Driver for MPC52xx processor BestComm peripheral controller | |
3 | * | |
4 | * | |
5 | * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com> | |
6 | * Copyright (C) 2005 Varma Electronics Oy, | |
7 | * ( by Andrey Volkov <avolkov@varma-el.com> ) | |
8 | * Copyright (C) 2003-2004 MontaVista, Software, Inc. | |
9 | * ( by Dale Farnsworth <dfarnsworth@mvista.com> ) | |
10 | * | |
11 | * This file is licensed under the terms of the GNU General Public License | |
12 | * version 2. This program is licensed "as is" without any warranty of any | |
13 | * kind, whether express or implied. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/of.h> | |
20 | #include <linux/of_device.h> | |
21 | #include <linux/of_platform.h> | |
22 | #include <asm/io.h> | |
23 | #include <asm/irq.h> | |
24 | #include <asm/mpc52xx.h> | |
25 | ||
26 | #include "sram.h" | |
27 | #include "bestcomm_priv.h" | |
28 | #include "bestcomm.h" | |
29 | ||
30 | #define DRIVER_NAME "bestcomm-core" | |
31 | ||
66ffbe49 GL |
32 | /* MPC5200 device tree match tables */ |
33 | static struct of_device_id mpc52xx_sram_ids[] __devinitdata = { | |
34 | { .compatible = "fsl,mpc5200-sram", }, | |
35 | { .compatible = "mpc5200-sram", }, | |
36 | {} | |
37 | }; | |
38 | ||
2f9ea1bd SM |
39 | |
40 | struct bcom_engine *bcom_eng = NULL; | |
41 | EXPORT_SYMBOL_GPL(bcom_eng); /* needed for inline functions */ | |
42 | ||
2f9ea1bd SM |
43 | /* ======================================================================== */ |
44 | /* Public and private API */ | |
45 | /* ======================================================================== */ | |
46 | ||
47 | /* Private API */ | |
48 | ||
49 | struct bcom_task * | |
50 | bcom_task_alloc(int bd_count, int bd_size, int priv_size) | |
51 | { | |
52 | int i, tasknum = -1; | |
53 | struct bcom_task *tsk; | |
54 | ||
9560aea4 GL |
55 | /* Don't try to do anything if bestcomm init failed */ |
56 | if (!bcom_eng) | |
57 | return NULL; | |
58 | ||
2f9ea1bd SM |
59 | /* Get and reserve a task num */ |
60 | spin_lock(&bcom_eng->lock); | |
61 | ||
62 | for (i=0; i<BCOM_MAX_TASKS; i++) | |
63 | if (!bcom_eng->tdt[i].stop) { /* we use stop as a marker */ | |
64 | bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */ | |
65 | tasknum = i; | |
66 | break; | |
67 | } | |
68 | ||
69 | spin_unlock(&bcom_eng->lock); | |
70 | ||
71 | if (tasknum < 0) | |
72 | return NULL; | |
73 | ||
74 | /* Allocate our structure */ | |
75 | tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL); | |
76 | if (!tsk) | |
77 | goto error; | |
78 | ||
79 | tsk->tasknum = tasknum; | |
80 | if (priv_size) | |
81 | tsk->priv = (void*)tsk + sizeof(struct bcom_task); | |
82 | ||
83 | /* Get IRQ of that task */ | |
84 | tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum); | |
85 | if (tsk->irq == NO_IRQ) | |
86 | goto error; | |
87 | ||
88 | /* Init the BDs, if needed */ | |
89 | if (bd_count) { | |
90 | tsk->cookie = kmalloc(sizeof(void*) * bd_count, GFP_KERNEL); | |
91 | if (!tsk->cookie) | |
92 | goto error; | |
93 | ||
94 | tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa); | |
95 | if (!tsk->bd) | |
96 | goto error; | |
97 | memset(tsk->bd, 0x00, bd_count * bd_size); | |
98 | ||
99 | tsk->num_bd = bd_count; | |
100 | tsk->bd_size = bd_size; | |
101 | } | |
102 | ||
103 | return tsk; | |
104 | ||
105 | error: | |
106 | if (tsk) { | |
107 | if (tsk->irq != NO_IRQ) | |
108 | irq_dispose_mapping(tsk->irq); | |
109 | bcom_sram_free(tsk->bd); | |
110 | kfree(tsk->cookie); | |
111 | kfree(tsk); | |
112 | } | |
113 | ||
114 | bcom_eng->tdt[tasknum].stop = 0; | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(bcom_task_alloc); | |
119 | ||
120 | void | |
121 | bcom_task_free(struct bcom_task *tsk) | |
122 | { | |
123 | /* Stop the task */ | |
124 | bcom_disable_task(tsk->tasknum); | |
125 | ||
126 | /* Clear TDT */ | |
127 | bcom_eng->tdt[tsk->tasknum].start = 0; | |
128 | bcom_eng->tdt[tsk->tasknum].stop = 0; | |
129 | ||
130 | /* Free everything */ | |
131 | irq_dispose_mapping(tsk->irq); | |
132 | bcom_sram_free(tsk->bd); | |
133 | kfree(tsk->cookie); | |
134 | kfree(tsk); | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(bcom_task_free); | |
137 | ||
138 | int | |
139 | bcom_load_image(int task, u32 *task_image) | |
140 | { | |
141 | struct bcom_task_header *hdr = (struct bcom_task_header *)task_image; | |
142 | struct bcom_tdt *tdt; | |
143 | u32 *desc, *var, *inc; | |
144 | u32 *desc_src, *var_src, *inc_src; | |
145 | ||
146 | /* Safety checks */ | |
147 | if (hdr->magic != BCOM_TASK_MAGIC) { | |
148 | printk(KERN_ERR DRIVER_NAME | |
149 | ": Trying to load invalid microcode\n"); | |
150 | return -EINVAL; | |
151 | } | |
152 | ||
153 | if ((task < 0) || (task >= BCOM_MAX_TASKS)) { | |
154 | printk(KERN_ERR DRIVER_NAME | |
155 | ": Trying to load invalid task %d\n", task); | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
159 | /* Initial load or reload */ | |
160 | tdt = &bcom_eng->tdt[task]; | |
161 | ||
162 | if (tdt->start) { | |
163 | desc = bcom_task_desc(task); | |
164 | if (hdr->desc_size != bcom_task_num_descs(task)) { | |
165 | printk(KERN_ERR DRIVER_NAME | |
166 | ": Trying to reload wrong task image " | |
167 | "(%d size %d/%d)!\n", | |
168 | task, | |
169 | hdr->desc_size, | |
170 | bcom_task_num_descs(task)); | |
171 | return -EINVAL; | |
172 | } | |
173 | } else { | |
174 | phys_addr_t start_pa; | |
175 | ||
176 | desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa); | |
177 | if (!desc) | |
178 | return -ENOMEM; | |
179 | ||
180 | tdt->start = start_pa; | |
181 | tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32)); | |
182 | } | |
183 | ||
184 | var = bcom_task_var(task); | |
185 | inc = bcom_task_inc(task); | |
186 | ||
187 | /* Clear & copy */ | |
188 | memset(var, 0x00, BCOM_VAR_SIZE); | |
189 | memset(inc, 0x00, BCOM_INC_SIZE); | |
190 | ||
191 | desc_src = (u32 *)(hdr + 1); | |
192 | var_src = desc_src + hdr->desc_size; | |
193 | inc_src = var_src + hdr->var_size; | |
194 | ||
195 | memcpy(desc, desc_src, hdr->desc_size * sizeof(u32)); | |
196 | memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32)); | |
197 | memcpy(inc, inc_src, hdr->inc_size * sizeof(u32)); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(bcom_load_image); | |
202 | ||
203 | void | |
204 | bcom_set_initiator(int task, int initiator) | |
205 | { | |
206 | int i; | |
207 | int num_descs; | |
208 | u32 *desc; | |
209 | int next_drd_has_initiator; | |
210 | ||
211 | bcom_set_tcr_initiator(task, initiator); | |
212 | ||
213 | /* Just setting tcr is apparently not enough due to some problem */ | |
214 | /* with it. So we just go thru all the microcode and replace in */ | |
215 | /* the DRD directly */ | |
216 | ||
217 | desc = bcom_task_desc(task); | |
218 | next_drd_has_initiator = 1; | |
219 | num_descs = bcom_task_num_descs(task); | |
220 | ||
221 | for (i=0; i<num_descs; i++, desc++) { | |
222 | if (!bcom_desc_is_drd(*desc)) | |
223 | continue; | |
224 | if (next_drd_has_initiator) | |
225 | if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS) | |
226 | bcom_set_desc_initiator(desc, initiator); | |
227 | next_drd_has_initiator = !bcom_drd_is_extended(*desc); | |
228 | } | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(bcom_set_initiator); | |
231 | ||
232 | ||
233 | /* Public API */ | |
234 | ||
235 | void | |
236 | bcom_enable(struct bcom_task *tsk) | |
237 | { | |
238 | bcom_enable_task(tsk->tasknum); | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(bcom_enable); | |
241 | ||
242 | void | |
243 | bcom_disable(struct bcom_task *tsk) | |
244 | { | |
245 | bcom_disable_task(tsk->tasknum); | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(bcom_disable); | |
248 | ||
249 | ||
250 | /* ======================================================================== */ | |
251 | /* Engine init/cleanup */ | |
252 | /* ======================================================================== */ | |
253 | ||
254 | /* Function Descriptor table */ | |
255 | /* this will need to be updated if Freescale changes their task code FDT */ | |
256 | static u32 fdt_ops[] = { | |
257 | 0xa0045670, /* FDT[48] - load_acc() */ | |
258 | 0x80045670, /* FDT[49] - unload_acc() */ | |
259 | 0x21800000, /* FDT[50] - and() */ | |
260 | 0x21e00000, /* FDT[51] - or() */ | |
261 | 0x21500000, /* FDT[52] - xor() */ | |
262 | 0x21400000, /* FDT[53] - andn() */ | |
263 | 0x21500000, /* FDT[54] - not() */ | |
264 | 0x20400000, /* FDT[55] - add() */ | |
265 | 0x20500000, /* FDT[56] - sub() */ | |
266 | 0x20800000, /* FDT[57] - lsh() */ | |
267 | 0x20a00000, /* FDT[58] - rsh() */ | |
268 | 0xc0170000, /* FDT[59] - crc8() */ | |
269 | 0xc0145670, /* FDT[60] - crc16() */ | |
270 | 0xc0345670, /* FDT[61] - crc32() */ | |
271 | 0xa0076540, /* FDT[62] - endian32() */ | |
272 | 0xa0000760, /* FDT[63] - endian16() */ | |
273 | }; | |
274 | ||
275 | ||
276 | static int __devinit | |
277 | bcom_engine_init(void) | |
278 | { | |
279 | int task; | |
280 | phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa; | |
281 | unsigned int tdt_size, ctx_size, var_size, fdt_size; | |
282 | ||
283 | /* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */ | |
284 | tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt); | |
285 | ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE; | |
286 | var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE); | |
287 | fdt_size = BCOM_FDT_SIZE; | |
288 | ||
289 | bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa); | |
290 | bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa); | |
291 | bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa); | |
292 | bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa); | |
293 | ||
294 | if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) { | |
295 | printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n"); | |
296 | ||
297 | bcom_sram_free(bcom_eng->tdt); | |
298 | bcom_sram_free(bcom_eng->ctx); | |
299 | bcom_sram_free(bcom_eng->var); | |
300 | bcom_sram_free(bcom_eng->fdt); | |
301 | ||
302 | return -ENOMEM; | |
303 | } | |
304 | ||
305 | memset(bcom_eng->tdt, 0x00, tdt_size); | |
306 | memset(bcom_eng->ctx, 0x00, ctx_size); | |
307 | memset(bcom_eng->var, 0x00, var_size); | |
308 | memset(bcom_eng->fdt, 0x00, fdt_size); | |
309 | ||
310 | /* Copy the FDT for the EU#3 */ | |
311 | memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops)); | |
312 | ||
313 | /* Initialize Task base structure */ | |
314 | for (task=0; task<BCOM_MAX_TASKS; task++) | |
315 | { | |
316 | out_be16(&bcom_eng->regs->tcr[task], 0); | |
317 | out_8(&bcom_eng->regs->ipr[task], 0); | |
318 | ||
319 | bcom_eng->tdt[task].context = ctx_pa; | |
320 | bcom_eng->tdt[task].var = var_pa; | |
321 | bcom_eng->tdt[task].fdt = fdt_pa; | |
322 | ||
323 | var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE; | |
324 | ctx_pa += BCOM_CTX_SIZE; | |
325 | } | |
326 | ||
327 | out_be32(&bcom_eng->regs->taskBar, tdt_pa); | |
328 | ||
329 | /* Init 'always' initiator */ | |
330 | out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS); | |
331 | ||
c052a22e | 332 | /* Disable COMM Bus Prefetch on the original 5200; it's broken */ |
aaab5e83 GL |
333 | if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR) |
334 | bcom_disable_prefetch(); | |
2f9ea1bd SM |
335 | |
336 | /* Init lock */ | |
337 | spin_lock_init(&bcom_eng->lock); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static void | |
343 | bcom_engine_cleanup(void) | |
344 | { | |
345 | int task; | |
346 | ||
347 | /* Stop all tasks */ | |
348 | for (task=0; task<BCOM_MAX_TASKS; task++) | |
349 | { | |
350 | out_be16(&bcom_eng->regs->tcr[task], 0); | |
351 | out_8(&bcom_eng->regs->ipr[task], 0); | |
352 | } | |
353 | ||
354 | out_be32(&bcom_eng->regs->taskBar, 0ul); | |
355 | ||
356 | /* Release the SRAM zones */ | |
357 | bcom_sram_free(bcom_eng->tdt); | |
358 | bcom_sram_free(bcom_eng->ctx); | |
359 | bcom_sram_free(bcom_eng->var); | |
360 | bcom_sram_free(bcom_eng->fdt); | |
361 | } | |
362 | ||
363 | ||
364 | /* ======================================================================== */ | |
365 | /* OF platform driver */ | |
366 | /* ======================================================================== */ | |
367 | ||
368 | static int __devinit | |
369 | mpc52xx_bcom_probe(struct of_device *op, const struct of_device_id *match) | |
370 | { | |
371 | struct device_node *ofn_sram; | |
372 | struct resource res_bcom; | |
373 | ||
374 | int rv; | |
375 | ||
376 | /* Inform user we're ok so far */ | |
377 | printk(KERN_INFO "DMA: MPC52xx BestComm driver\n"); | |
378 | ||
379 | /* Get the bestcomm node */ | |
61c7a080 | 380 | of_node_get(op->dev.of_node); |
2f9ea1bd SM |
381 | |
382 | /* Prepare SRAM */ | |
66ffbe49 | 383 | ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids); |
2f9ea1bd SM |
384 | if (!ofn_sram) { |
385 | printk(KERN_ERR DRIVER_NAME ": " | |
386 | "No SRAM found in device tree\n"); | |
387 | rv = -ENODEV; | |
388 | goto error_ofput; | |
389 | } | |
390 | rv = bcom_sram_init(ofn_sram, DRIVER_NAME); | |
391 | of_node_put(ofn_sram); | |
392 | ||
393 | if (rv) { | |
394 | printk(KERN_ERR DRIVER_NAME ": " | |
395 | "Error in SRAM init\n"); | |
396 | goto error_ofput; | |
397 | } | |
398 | ||
399 | /* Get a clean struct */ | |
400 | bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL); | |
401 | if (!bcom_eng) { | |
402 | printk(KERN_ERR DRIVER_NAME ": " | |
403 | "Can't allocate state structure\n"); | |
404 | rv = -ENOMEM; | |
405 | goto error_sramclean; | |
406 | } | |
407 | ||
408 | /* Save the node */ | |
61c7a080 | 409 | bcom_eng->ofnode = op->dev.of_node; |
2f9ea1bd SM |
410 | |
411 | /* Get, reserve & map io */ | |
61c7a080 | 412 | if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) { |
2f9ea1bd SM |
413 | printk(KERN_ERR DRIVER_NAME ": " |
414 | "Can't get resource\n"); | |
415 | rv = -EINVAL; | |
416 | goto error_sramclean; | |
417 | } | |
418 | ||
419 | if (!request_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma), | |
420 | DRIVER_NAME)) { | |
421 | printk(KERN_ERR DRIVER_NAME ": " | |
422 | "Can't request registers region\n"); | |
423 | rv = -EBUSY; | |
424 | goto error_sramclean; | |
425 | } | |
426 | ||
427 | bcom_eng->regs_base = res_bcom.start; | |
428 | bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma)); | |
429 | if (!bcom_eng->regs) { | |
430 | printk(KERN_ERR DRIVER_NAME ": " | |
431 | "Can't map registers\n"); | |
432 | rv = -ENOMEM; | |
433 | goto error_release; | |
434 | } | |
435 | ||
436 | /* Now, do the real init */ | |
437 | rv = bcom_engine_init(); | |
438 | if (rv) | |
439 | goto error_unmap; | |
440 | ||
441 | /* Done ! */ | |
442 | printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n", | |
08b6c06d | 443 | (long)bcom_eng->regs_base); |
2f9ea1bd SM |
444 | |
445 | return 0; | |
446 | ||
447 | /* Error path */ | |
448 | error_unmap: | |
449 | iounmap(bcom_eng->regs); | |
450 | error_release: | |
451 | release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma)); | |
452 | error_sramclean: | |
453 | kfree(bcom_eng); | |
454 | bcom_sram_cleanup(); | |
455 | error_ofput: | |
61c7a080 | 456 | of_node_put(op->dev.of_node); |
2f9ea1bd SM |
457 | |
458 | printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n"); | |
459 | ||
460 | return rv; | |
461 | } | |
462 | ||
463 | ||
464 | static int | |
465 | mpc52xx_bcom_remove(struct of_device *op) | |
466 | { | |
467 | /* Clean up the engine */ | |
468 | bcom_engine_cleanup(); | |
469 | ||
470 | /* Cleanup SRAM */ | |
471 | bcom_sram_cleanup(); | |
472 | ||
473 | /* Release regs */ | |
474 | iounmap(bcom_eng->regs); | |
475 | release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma)); | |
476 | ||
477 | /* Release the node */ | |
478 | of_node_put(bcom_eng->ofnode); | |
479 | ||
480 | /* Release memory */ | |
481 | kfree(bcom_eng); | |
482 | bcom_eng = NULL; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | static struct of_device_id mpc52xx_bcom_of_match[] = { | |
7ea6fd7e AG |
488 | { .compatible = "fsl,mpc5200-bestcomm", }, |
489 | { .compatible = "mpc5200-bestcomm", }, | |
2f9ea1bd SM |
490 | {}, |
491 | }; | |
492 | ||
493 | MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match); | |
494 | ||
495 | ||
496 | static struct of_platform_driver mpc52xx_bcom_of_platform_driver = { | |
2f9ea1bd SM |
497 | .probe = mpc52xx_bcom_probe, |
498 | .remove = mpc52xx_bcom_remove, | |
4018294b GL |
499 | .driver = { |
500 | .name = DRIVER_NAME, | |
501 | .owner = THIS_MODULE, | |
502 | .of_match_table = mpc52xx_bcom_of_match, | |
2f9ea1bd SM |
503 | }, |
504 | }; | |
505 | ||
506 | ||
507 | /* ======================================================================== */ | |
508 | /* Module */ | |
509 | /* ======================================================================== */ | |
510 | ||
511 | static int __init | |
512 | mpc52xx_bcom_init(void) | |
513 | { | |
514 | return of_register_platform_driver(&mpc52xx_bcom_of_platform_driver); | |
515 | } | |
516 | ||
517 | static void __exit | |
518 | mpc52xx_bcom_exit(void) | |
519 | { | |
520 | of_unregister_platform_driver(&mpc52xx_bcom_of_platform_driver); | |
521 | } | |
522 | ||
523 | /* If we're not a module, we must make sure everything is setup before */ | |
524 | /* anyone tries to use us ... that's why we use subsys_initcall instead */ | |
525 | /* of module_init. */ | |
526 | subsys_initcall(mpc52xx_bcom_init); | |
527 | module_exit(mpc52xx_bcom_exit); | |
528 | ||
529 | MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA"); | |
530 | MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>"); | |
531 | MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>"); | |
532 | MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>"); | |
533 | MODULE_LICENSE("GPL v2"); | |
534 |