summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/sysdev/bestcomm/bestcomm.c
blob: 65025611506495447386e214112f3bf03e166599 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
/*
 * Driver for MPC52xx processor BestComm peripheral controller
 *
 *
 * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2005      Varma Electronics Oy,
 *                         ( by Andrey Volkov <avolkov@varma-el.com> )
 * Copyright (C) 2003-2004 MontaVista, Software, Inc.
 *                         ( by Dale Farnsworth <dfarnsworth@mvista.com> )
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mpc52xx.h>

#include "sram.h"
#include "bestcomm_priv.h"
#include "bestcomm.h"

#define DRIVER_NAME "bestcomm-core"

/* MPC5200 device tree match tables */
static struct of_device_id mpc52xx_sram_ids[] __devinitdata = {
	{ .compatible = "fsl,mpc5200-sram", },
	{ .compatible = "mpc5200-sram", },
	{}
};


struct bcom_engine *bcom_eng = NULL;
EXPORT_SYMBOL_GPL(bcom_eng);	/* needed for inline functions */

/* ======================================================================== */
/* Public and private API                                                   */
/* ======================================================================== */

/* Private API */

struct bcom_task *
bcom_task_alloc(int bd_count, int bd_size, int priv_size)
{
	int i, tasknum = -1;
	struct bcom_task *tsk;

	/* Don't try to do anything if bestcomm init failed */
	if (!bcom_eng)
		return NULL;

	/* Get and reserve a task num */
	spin_lock(&bcom_eng->lock);

	for (i=0; i<BCOM_MAX_TASKS; i++)
		if (!bcom_eng->tdt[i].stop) {	/* we use stop as a marker */
			bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */
			tasknum = i;
			break;
		}

	spin_unlock(&bcom_eng->lock);

	if (tasknum < 0)
		return NULL;

	/* Allocate our structure */
	tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL);
	if (!tsk)
		goto error;

	tsk->tasknum = tasknum;
	if (priv_size)
		tsk->priv = (void*)tsk + sizeof(struct bcom_task);

	/* Get IRQ of that task */
	tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum);
	if (tsk->irq == NO_IRQ)
		goto error;

	/* Init the BDs, if needed */
	if (bd_count) {
		tsk->cookie = kmalloc(sizeof(void*) * bd_count, GFP_KERNEL);
		if (!tsk->cookie)
			goto error;

		tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa);
		if (!tsk->bd)
			goto error;
		memset(tsk->bd, 0x00, bd_count * bd_size);

		tsk->num_bd = bd_count;
		tsk->bd_size = bd_size;
	}

	return tsk;

error:
	if (tsk) {
		if (tsk->irq != NO_IRQ)
			irq_dispose_mapping(tsk->irq);
		bcom_sram_free(tsk->bd);
		kfree(tsk->cookie);
		kfree(tsk);
	}

	bcom_eng->tdt[tasknum].stop = 0;

	return NULL;
}
EXPORT_SYMBOL_GPL(bcom_task_alloc);

void
bcom_task_free(struct bcom_task *tsk)
{
	/* Stop the task */
	bcom_disable_task(tsk->tasknum);

	/* Clear TDT */
	bcom_eng->tdt[tsk->tasknum].start = 0;
	bcom_eng->tdt[tsk->tasknum].stop  = 0;

	/* Free everything */
	irq_dispose_mapping(tsk->irq);
	bcom_sram_free(tsk->bd);
	kfree(tsk->cookie);
	kfree(tsk);
}
EXPORT_SYMBOL_GPL(bcom_task_free);

int
bcom_load_image(int task, u32 *task_image)
{
	struct bcom_task_header *hdr = (struct bcom_task_header *)task_image;
	struct bcom_tdt *tdt;
	u32 *desc, *var, *inc;
	u32 *desc_src, *var_src, *inc_src;

	/* Safety checks */
	if (hdr->magic != BCOM_TASK_MAGIC) {
		printk(KERN_ERR DRIVER_NAME
			": Trying to load invalid microcode\n");
		return -EINVAL;
	}

	if ((task < 0) || (task >= BCOM_MAX_TASKS)) {
		printk(KERN_ERR DRIVER_NAME
			": Trying to load invalid task %d\n", task);
		return -EINVAL;
	}

	/* Initial load or reload */
	tdt = &bcom_eng->tdt[task];

	if (tdt->start) {
		desc = bcom_task_desc(task);
		if (hdr->desc_size != bcom_task_num_descs(task)) {
			printk(KERN_ERR DRIVER_NAME
				": Trying to reload wrong task image "
				"(%d size %d/%d)!\n",
				task,
				hdr->desc_size,
				bcom_task_num_descs(task));
			return -EINVAL;
		}
	} else {
		phys_addr_t start_pa;

		desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa);
		if (!desc)
			return -ENOMEM;

		tdt->start = start_pa;
		tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32));
	}

	var = bcom_task_var(task);
	inc = bcom_task_inc(task);

	/* Clear & copy */
	memset(var, 0x00, BCOM_VAR_SIZE);
	memset(inc, 0x00, BCOM_INC_SIZE);

	desc_src = (u32 *)(hdr + 1);
	var_src = desc_src + hdr->desc_size;
	inc_src = var_src + hdr->var_size;

	memcpy(desc, desc_src, hdr->desc_size * sizeof(u32));
	memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32));
	memcpy(inc, inc_src, hdr->inc_size * sizeof(u32));

	return 0;
}
EXPORT_SYMBOL_GPL(bcom_load_image);

void
bcom_set_initiator(int task, int initiator)
{
	int i;
	int num_descs;
	u32 *desc;
	int next_drd_has_initiator;

	bcom_set_tcr_initiator(task, initiator);

	/* Just setting tcr is apparently not enough due to some problem */
	/* with it. So we just go thru all the microcode and replace in  */
	/* the DRD directly */

	desc = bcom_task_desc(task);
	next_drd_has_initiator = 1;
	num_descs = bcom_task_num_descs(task);

	for (i=0; i<num_descs; i++, desc++) {
		if (!bcom_desc_is_drd(*desc))
			continue;
		if (next_drd_has_initiator)
			if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS)
				bcom_set_desc_initiator(desc, initiator);
		next_drd_has_initiator = !bcom_drd_is_extended(*desc);
	}
}
EXPORT_SYMBOL_GPL(bcom_set_initiator);


/* Public API */

void
bcom_enable(struct bcom_task *tsk)
{
	bcom_enable_task(tsk->tasknum);
}
EXPORT_SYMBOL_GPL(bcom_enable);

void
bcom_disable(struct bcom_task *tsk)
{
	bcom_disable_task(tsk->tasknum);
}
EXPORT_SYMBOL_GPL(bcom_disable);


/* ======================================================================== */
/* Engine init/cleanup                                                      */
/* ======================================================================== */

/* Function Descriptor table */
/* this will need to be updated if Freescale changes their task code FDT */
static u32 fdt_ops[] = {
	0xa0045670,	/* FDT[48] - load_acc()	  */
	0x80045670,	/* FDT[49] - unload_acc() */
	0x21800000,	/* FDT[50] - and()        */
	0x21e00000,	/* FDT[51] - or()         */
	0x21500000,	/* FDT[52] - xor()        */
	0x21400000,	/* FDT[53] - andn()       */
	0x21500000,	/* FDT[54] - not()        */
	0x20400000,	/* FDT[55] - add()        */
	0x20500000,	/* FDT[56] - sub()        */
	0x20800000,	/* FDT[57] - lsh()        */
	0x20a00000,	/* FDT[58] - rsh()        */
	0xc0170000,	/* FDT[59] - crc8()       */
	0xc0145670,	/* FDT[60] - crc16()      */
	0xc0345670,	/* FDT[61] - crc32()      */
	0xa0076540,	/* FDT[62] - endian32()   */
	0xa0000760,	/* FDT[63] - endian16()   */
};


static int __devinit
bcom_engine_init(void)
{
	int task;
	phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
	unsigned int tdt_size, ctx_size, var_size, fdt_size;

	/* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
	tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
	ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE;
	var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE);
	fdt_size = BCOM_FDT_SIZE;

	bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa);
	bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa);
	bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa);
	bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa);

	if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) {
		printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n");

		bcom_sram_free(bcom_eng->tdt);
		bcom_sram_free(bcom_eng->ctx);
		bcom_sram_free(bcom_eng->var);
		bcom_sram_free(bcom_eng->fdt);

		return -ENOMEM;
	}

	memset(bcom_eng->tdt, 0x00, tdt_size);
	memset(bcom_eng->ctx, 0x00, ctx_size);
	memset(bcom_eng->var, 0x00, var_size);
	memset(bcom_eng->fdt, 0x00, fdt_size);

	/* Copy the FDT for the EU#3 */
	memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops));

	/* Initialize Task base structure */
	for (task=0; task<BCOM_MAX_TASKS; task++)
	{
		out_be16(&bcom_eng->regs->tcr[task], 0);
		out_8(&bcom_eng->regs->ipr[task], 0);

		bcom_eng->tdt[task].context	= ctx_pa;
		bcom_eng->tdt[task].var	= var_pa;
		bcom_eng->tdt[task].fdt	= fdt_pa;

		var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE;
		ctx_pa += BCOM_CTX_SIZE;
	}

	out_be32(&bcom_eng->regs->taskBar, tdt_pa);

	/* Init 'always' initiator */
	out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);

	/* Disable COMM Bus Prefetch on the original 5200; it's broken */
	if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR)
		bcom_disable_prefetch();

	/* Init lock */
	spin_lock_init(&bcom_eng->lock);

	return 0;
}

static void
bcom_engine_cleanup(void)
{
	int task;

	/* Stop all tasks */
	for (task=0; task<BCOM_MAX_TASKS; task++)
	{
		out_be16(&bcom_eng->regs->tcr[task], 0);
		out_8(&bcom_eng->regs->ipr[task], 0);
	}

	out_be32(&bcom_eng->regs->taskBar, 0ul);

	/* Release the SRAM zones */
	bcom_sram_free(bcom_eng->tdt);
	bcom_sram_free(bcom_eng->ctx);
	bcom_sram_free(bcom_eng->var);
	bcom_sram_free(bcom_eng->fdt);
}


/* ======================================================================== */
/* OF platform driver                                                       */
/* ======================================================================== */

static int __devinit mpc52xx_bcom_probe(struct platform_device *op,
					const struct of_device_id *match)
{
	struct device_node *ofn_sram;
	struct resource res_bcom;

	int rv;

	/* Inform user we're ok so far */
	printk(KERN_INFO "DMA: MPC52xx BestComm driver\n");

	/* Get the bestcomm node */
	of_node_get(op->dev.of_node);

	/* Prepare SRAM */
	ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids);
	if (!ofn_sram) {
		printk(KERN_ERR DRIVER_NAME ": "
			"No SRAM found in device tree\n");
		rv = -ENODEV;
		goto error_ofput;
	}
	rv = bcom_sram_init(ofn_sram, DRIVER_NAME);
	of_node_put(ofn_sram);

	if (rv) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Error in SRAM init\n");
		goto error_ofput;
	}

	/* Get a clean struct */
	bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL);
	if (!bcom_eng) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't allocate state structure\n");
		rv = -ENOMEM;
		goto error_sramclean;
	}

	/* Save the node */
	bcom_eng->ofnode = op->dev.of_node;

	/* Get, reserve & map io */
	if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't get resource\n");
		rv = -EINVAL;
		goto error_sramclean;
	}

	if (!request_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma),
				DRIVER_NAME)) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't request registers region\n");
		rv = -EBUSY;
		goto error_sramclean;
	}

	bcom_eng->regs_base = res_bcom.start;
	bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma));
	if (!bcom_eng->regs) {
		printk(KERN_ERR DRIVER_NAME ": "
			"Can't map registers\n");
		rv = -ENOMEM;
		goto error_release;
	}

	/* Now, do the real init */
	rv = bcom_engine_init();
	if (rv)
		goto error_unmap;

	/* Done ! */
	printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n",
		(long)bcom_eng->regs_base);

	return 0;

	/* Error path */
error_unmap:
	iounmap(bcom_eng->regs);
error_release:
	release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma));
error_sramclean:
	kfree(bcom_eng);
	bcom_sram_cleanup();
error_ofput:
	of_node_put(op->dev.of_node);

	printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n");

	return rv;
}


static int mpc52xx_bcom_remove(struct platform_device *op)
{
	/* Clean up the engine */
	bcom_engine_cleanup();

	/* Cleanup SRAM */
	bcom_sram_cleanup();

	/* Release regs */
	iounmap(bcom_eng->regs);
	release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma));

	/* Release the node */
	of_node_put(bcom_eng->ofnode);

	/* Release memory */
	kfree(bcom_eng);
	bcom_eng = NULL;

	return 0;
}

static struct of_device_id mpc52xx_bcom_of_match[] = {
	{ .compatible = "fsl,mpc5200-bestcomm", },
	{ .compatible = "mpc5200-bestcomm", },
	{},
};

MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match);


static struct of_platform_driver mpc52xx_bcom_of_platform_driver = {
	.probe		= mpc52xx_bcom_probe,
	.remove		= mpc52xx_bcom_remove,
	.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,
		.of_match_table = mpc52xx_bcom_of_match,
	},
};


/* ======================================================================== */
/* Module                                                                   */
/* ======================================================================== */

static int __init
mpc52xx_bcom_init(void)
{
	return of_register_platform_driver(&mpc52xx_bcom_of_platform_driver);
}

static void __exit
mpc52xx_bcom_exit(void)
{
	of_unregister_platform_driver(&mpc52xx_bcom_of_platform_driver);
}

/* If we're not a module, we must make sure everything is setup before  */
/* anyone tries to use us ... that's why we use subsys_initcall instead */
/* of module_init. */
subsys_initcall(mpc52xx_bcom_init);
module_exit(mpc52xx_bcom_exit);

MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA");
MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>");
MODULE_LICENSE("GPL v2");