xref: /openbmc/linux/drivers/dma/bestcomm/bestcomm.c (revision a325f174) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for MPC52xx processor BestComm peripheral controller
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 
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/of_irq.h>
18 #include <linux/platform_device.h>
19 #include <asm/io.h>
20 #include <asm/irq.h>
21 #include <asm/mpc52xx.h>
22 
23 #include <linux/fsl/bestcomm/sram.h>
24 #include <linux/fsl/bestcomm/bestcomm_priv.h>
25 #include "linux/fsl/bestcomm/bestcomm.h"
26 
27 #define DRIVER_NAME "bestcomm-core"
28 
29 /* MPC5200 device tree match tables */
30 static const struct of_device_id mpc52xx_sram_ids[] = {
31 	{ .compatible = "fsl,mpc5200-sram", },
32 	{ .compatible = "mpc5200-sram", },
33 	{}
34 };
35 
36 
37 struct bcom_engine *bcom_eng = NULL;
38 EXPORT_SYMBOL_GPL(bcom_eng);	/* needed for inline functions */
39 
40 /* ======================================================================== */
41 /* Public and private API                                                   */
42 /* ======================================================================== */
43 
44 /* Private API */
45 
46 struct bcom_task *
47 bcom_task_alloc(int bd_count, int bd_size, int priv_size)
48 {
49 	int i, tasknum = -1;
50 	struct bcom_task *tsk;
51 
52 	/* Don't try to do anything if bestcomm init failed */
53 	if (!bcom_eng)
54 		return NULL;
55 
56 	/* Get and reserve a task num */
57 	spin_lock(&bcom_eng->lock);
58 
59 	for (i=0; i<BCOM_MAX_TASKS; i++)
60 		if (!bcom_eng->tdt[i].stop) {	/* we use stop as a marker */
61 			bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */
62 			tasknum = i;
63 			break;
64 		}
65 
66 	spin_unlock(&bcom_eng->lock);
67 
68 	if (tasknum < 0)
69 		return NULL;
70 
71 	/* Allocate our structure */
72 	tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL);
73 	if (!tsk)
74 		goto error;
75 
76 	tsk->tasknum = tasknum;
77 	if (priv_size)
78 		tsk->priv = (void*)tsk + sizeof(struct bcom_task);
79 
80 	/* Get IRQ of that task */
81 	tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum);
82 	if (!tsk->irq)
83 		goto error;
84 
85 	/* Init the BDs, if needed */
86 	if (bd_count) {
87 		tsk->cookie = kmalloc_array(bd_count, sizeof(void *),
88 					    GFP_KERNEL);
89 		if (!tsk->cookie)
90 			goto error;
91 
92 		tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
93 		if (!tsk->bd)
94 			goto error;
95 		memset_io(tsk->bd, 0x00, bd_count * bd_size);
96 
97 		tsk->num_bd = bd_count;
98 		tsk->bd_size = bd_size;
99 	}
100 
101 	return tsk;
102 
103 error:
104 	if (tsk) {
105 		if (tsk->irq)
106 			irq_dispose_mapping(tsk->irq);
107 		bcom_sram_free(tsk->bd);
108 		kfree(tsk->cookie);
109 		kfree(tsk);
110 	}
111 
112 	bcom_eng->tdt[tasknum].stop = 0;
113 
114 	return NULL;
115 }
116 EXPORT_SYMBOL_GPL(bcom_task_alloc);
117 
118 void
119 bcom_task_free(struct bcom_task *tsk)
120 {
121 	/* Stop the task */
122 	bcom_disable_task(tsk->tasknum);
123 
124 	/* Clear TDT */
125 	bcom_eng->tdt[tsk->tasknum].start = 0;
126 	bcom_eng->tdt[tsk->tasknum].stop  = 0;
127 
128 	/* Free everything */
129 	irq_dispose_mapping(tsk->irq);
130 	bcom_sram_free(tsk->bd);
131 	kfree(tsk->cookie);
132 	kfree(tsk);
133 }
134 EXPORT_SYMBOL_GPL(bcom_task_free);
135 
136 int
137 bcom_load_image(int task, u32 *task_image)
138 {
139 	struct bcom_task_header *hdr = (struct bcom_task_header *)task_image;
140 	struct bcom_tdt *tdt;
141 	u32 *desc, *var, *inc;
142 	u32 *desc_src, *var_src, *inc_src;
143 
144 	/* Safety checks */
145 	if (hdr->magic != BCOM_TASK_MAGIC) {
146 		printk(KERN_ERR DRIVER_NAME
147 			": Trying to load invalid microcode\n");
148 		return -EINVAL;
149 	}
150 
151 	if ((task < 0) || (task >= BCOM_MAX_TASKS)) {
152 		printk(KERN_ERR DRIVER_NAME
153 			": Trying to load invalid task %d\n", task);
154 		return -EINVAL;
155 	}
156 
157 	/* Initial load or reload */
158 	tdt = &bcom_eng->tdt[task];
159 
160 	if (tdt->start) {
161 		desc = bcom_task_desc(task);
162 		if (hdr->desc_size != bcom_task_num_descs(task)) {
163 			printk(KERN_ERR DRIVER_NAME
164 				": Trying to reload wrong task image "
165 				"(%d size %d/%d)!\n",
166 				task,
167 				hdr->desc_size,
168 				bcom_task_num_descs(task));
169 			return -EINVAL;
170 		}
171 	} else {
172 		phys_addr_t start_pa;
173 
174 		desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
175 		if (!desc)
176 			return -ENOMEM;
177 
178 		tdt->start = start_pa;
179 		tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
180 	}
181 
182 	var = bcom_task_var(task);
183 	inc = bcom_task_inc(task);
184 
185 	/* Clear & copy */
186 	memset_io(var, 0x00, BCOM_VAR_SIZE);
187 	memset_io(inc, 0x00, BCOM_INC_SIZE);
188 
189 	desc_src = (u32 *)(hdr + 1);
190 	var_src = desc_src + hdr->desc_size;
191 	inc_src = var_src + hdr->var_size;
192 
193 	memcpy_toio(desc, desc_src, hdr->desc_size * sizeof(u32));
194 	memcpy_toio(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
195 	memcpy_toio(inc, inc_src, hdr->inc_size * sizeof(u32));
196 
197 	return 0;
198 }
199 EXPORT_SYMBOL_GPL(bcom_load_image);
200 
201 void
202 bcom_set_initiator(int task, int initiator)
203 {
204 	int i;
205 	int num_descs;
206 	u32 *desc;
207 	int next_drd_has_initiator;
208 
209 	bcom_set_tcr_initiator(task, initiator);
210 
211 	/* Just setting tcr is apparently not enough due to some problem */
212 	/* with it. So we just go thru all the microcode and replace in  */
213 	/* the DRD directly */
214 
215 	desc = bcom_task_desc(task);
216 	next_drd_has_initiator = 1;
217 	num_descs = bcom_task_num_descs(task);
218 
219 	for (i=0; i<num_descs; i++, desc++) {
220 		if (!bcom_desc_is_drd(*desc))
221 			continue;
222 		if (next_drd_has_initiator)
223 			if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
224 				bcom_set_desc_initiator(desc, initiator);
225 		next_drd_has_initiator = !bcom_drd_is_extended(*desc);
226 	}
227 }
228 EXPORT_SYMBOL_GPL(bcom_set_initiator);
229 
230 
231 /* Public API */
232 
233 void
234 bcom_enable(struct bcom_task *tsk)
235 {
236 	bcom_enable_task(tsk->tasknum);
237 }
238 EXPORT_SYMBOL_GPL(bcom_enable);
239 
240 void
241 bcom_disable(struct bcom_task *tsk)
242 {
243 	bcom_disable_task(tsk->tasknum);
244 }
245 EXPORT_SYMBOL_GPL(bcom_disable);
246 
247 
248 /* ======================================================================== */
249 /* Engine init/cleanup                                                      */
250 /* ======================================================================== */
251 
252 /* Function Descriptor table */
253 /* this will need to be updated if Freescale changes their task code FDT */
254 static u32 fdt_ops[] = {
255 	0xa0045670,	/* FDT[48] - load_acc()	  */
256 	0x80045670,	/* FDT[49] - unload_acc() */
257 	0x21800000,	/* FDT[50] - and()        */
258 	0x21e00000,	/* FDT[51] - or()         */
259 	0x21500000,	/* FDT[52] - xor()        */
260 	0x21400000,	/* FDT[53] - andn()       */
261 	0x21500000,	/* FDT[54] - not()        */
262 	0x20400000,	/* FDT[55] - add()        */
263 	0x20500000,	/* FDT[56] - sub()        */
264 	0x20800000,	/* FDT[57] - lsh()        */
265 	0x20a00000,	/* FDT[58] - rsh()        */
266 	0xc0170000,	/* FDT[59] - crc8()       */
267 	0xc0145670,	/* FDT[60] - crc16()      */
268 	0xc0345670,	/* FDT[61] - crc32()      */
269 	0xa0076540,	/* FDT[62] - endian32()   */
270 	0xa0000760,	/* FDT[63] - endian16()   */
271 };
272 
273 
274 static int bcom_engine_init(void)
275 {
276 	int task;
277 	phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
278 	unsigned int tdt_size, ctx_size, var_size, fdt_size;
279 
280 	/* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
281 	tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
282 	ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
283 	var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
284 	fdt_size = BCOM_FDT_SIZE;
285 
286 	bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
287 	bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
288 	bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
289 	bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);
290 
291 	if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) {
292 		printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");
293 
294 		bcom_sram_free(bcom_eng->tdt);
295 		bcom_sram_free(bcom_eng->ctx);
296 		bcom_sram_free(bcom_eng->var);
297 		bcom_sram_free(bcom_eng->fdt);
298 
299 		return -ENOMEM;
300 	}
301 
302 	memset_io(bcom_eng->tdt, 0x00, tdt_size);
303 	memset_io(bcom_eng->ctx, 0x00, ctx_size);
304 	memset_io(bcom_eng->var, 0x00, var_size);
305 	memset_io(bcom_eng->fdt, 0x00, fdt_size);
306 
307 	/* Copy the FDT for the EU#3 */
308 	memcpy_toio(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));
309 
310 	/* Initialize Task base structure */
311 	for (task=0; task<BCOM_MAX_TASKS; task++)
312 	{
313 		out_be16(&bcom_eng->regs->tcr[task], 0);
314 		out_8(&bcom_eng->regs->ipr[task], 0);
315 
316 		bcom_eng->tdt[task].context	= ctx_pa;
317 		bcom_eng->tdt[task].var	= var_pa;
318 		bcom_eng->tdt[task].fdt	= fdt_pa;
319 
320 		var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
321 		ctx_pa += BCOM_CTX_SIZE;
322 	}
323 
324 	out_be32(&bcom_eng->regs->taskBar, tdt_pa);
325 
326 	/* Init 'always' initiator */
327 	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
328 
329 	/* Disable COMM Bus Prefetch on the original 5200; it's broken */
330 	if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
331 		bcom_disable_prefetch();
332 
333 	/* Init lock */
334 	spin_lock_init(&bcom_eng->lock);
335 
336 	return 0;
337 }
338 
339 static void
340 bcom_engine_cleanup(void)
341 {
342 	int task;
343 
344 	/* Stop all tasks */
345 	for (task=0; task<BCOM_MAX_TASKS; task++)
346 	{
347 		out_be16(&bcom_eng->regs->tcr[task], 0);
348 		out_8(&bcom_eng->regs->ipr[task], 0);
349 	}
350 
351 	out_be32(&bcom_eng->regs->taskBar, 0ul);
352 
353 	/* Release the SRAM zones */
354 	bcom_sram_free(bcom_eng->tdt);
355 	bcom_sram_free(bcom_eng->ctx);
356 	bcom_sram_free(bcom_eng->var);
357 	bcom_sram_free(bcom_eng->fdt);
358 }
359 
360 
361 /* ======================================================================== */
362 /* OF platform driver                                                       */
363 /* ======================================================================== */
364 
365 static int mpc52xx_bcom_probe(struct platform_device *op)
366 {
367 	struct device_node *ofn_sram;
368 	struct resource res_bcom;
369 
370 	int rv;
371 
372 	/* Inform user we're ok so far */
373 	printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");
374 
375 	/* Get the bestcomm node */
376 	of_node_get(op->dev.of_node);
377 
378 	/* Prepare SRAM */
379 	ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
380 	if (!ofn_sram) {
381 		printk(KERN_ERR DRIVER_NAME ": "
382 			"No SRAM found in device tree\n");
383 		rv = -ENODEV;
384 		goto error_ofput;
385 	}
386 	rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
387 	of_node_put(ofn_sram);
388 
389 	if (rv) {
390 		printk(KERN_ERR DRIVER_NAME ": "
391 			"Error in SRAM init\n");
392 		goto error_ofput;
393 	}
394 
395 	/* Get a clean struct */
396 	bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
397 	if (!bcom_eng) {
398 		rv = -ENOMEM;
399 		goto error_sramclean;
400 	}
401 
402 	/* Save the node */
403 	bcom_eng->ofnode = op->dev.of_node;
404 
405 	/* Get, reserve & map io */
406 	if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
407 		printk(KERN_ERR DRIVER_NAME ": "
408 			"Can't get resource\n");
409 		rv = -EINVAL;
410 		goto error_sramclean;
411 	}
412 
413 	if (!request_mem_region(res_bcom.start, resource_size(&res_bcom),
414 				DRIVER_NAME)) {
415 		printk(KERN_ERR DRIVER_NAME ": "
416 			"Can't request registers region\n");
417 		rv = -EBUSY;
418 		goto error_sramclean;
419 	}
420 
421 	bcom_eng->regs_base = res_bcom.start;
422 	bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
423 	if (!bcom_eng->regs) {
424 		printk(KERN_ERR DRIVER_NAME ": "
425 			"Can't map registers\n");
426 		rv = -ENOMEM;
427 		goto error_release;
428 	}
429 
430 	/* Now, do the real init */
431 	rv = bcom_engine_init();
432 	if (rv)
433 		goto error_unmap;
434 
435 	/* Done ! */
436 	printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
437 		(long)bcom_eng->regs_base);
438 
439 	return 0;
440 
441 	/* Error path */
442 error_unmap:
443 	iounmap(bcom_eng->regs);
444 error_release:
445 	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
446 error_sramclean:
447 	kfree(bcom_eng);
448 	bcom_sram_cleanup();
449 error_ofput:
450 	of_node_put(op->dev.of_node);
451 
452 	printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");
453 
454 	return rv;
455 }
456 
457 
458 static int mpc52xx_bcom_remove(struct platform_device *op)
459 {
460 	/* Clean up the engine */
461 	bcom_engine_cleanup();
462 
463 	/* Cleanup SRAM */
464 	bcom_sram_cleanup();
465 
466 	/* Release regs */
467 	iounmap(bcom_eng->regs);
468 	release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));
469 
470 	/* Release the node */
471 	of_node_put(bcom_eng->ofnode);
472 
473 	/* Release memory */
474 	kfree(bcom_eng);
475 	bcom_eng = NULL;
476 
477 	return 0;
478 }
479 
480 static const struct of_device_id mpc52xx_bcom_of_match[] = {
481 	{ .compatible = "fsl,mpc5200-bestcomm", },
482 	{ .compatible = "mpc5200-bestcomm", },
483 	{},
484 };
485 
486 MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);
487 
488 
489 static struct platform_driver mpc52xx_bcom_of_platform_driver = {
490 	.probe		= mpc52xx_bcom_probe,
491 	.remove		= mpc52xx_bcom_remove,
492 	.driver = {
493 		.name = DRIVER_NAME,
494 		.of_match_table = mpc52xx_bcom_of_match,
495 	},
496 };
497 
498 
499 /* ======================================================================== */
500 /* Module                                                                   */
501 /* ======================================================================== */
502 
503 static int __init
504 mpc52xx_bcom_init(void)
505 {
506 	return platform_driver_register(&mpc52xx_bcom_of_platform_driver);
507 }
508 
509 static void __exit
510 mpc52xx_bcom_exit(void)
511 {
512 	platform_driver_unregister(&mpc52xx_bcom_of_platform_driver);
513 }
514 
515 /* If we're not a module, we must make sure everything is setup before  */
516 /* anyone tries to use us ... that's why we use subsys_initcall instead */
517 /* of module_init. */
518 subsys_initcall(mpc52xx_bcom_init);
519 module_exit(mpc52xx_bcom_exit);
520 
521 MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
522 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
523 MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
524 MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
525 MODULE_LICENSE("GPL v2");
526