summaryrefslogtreecommitdiff
path: root/drivers/remoteproc/mtk_scp.c
blob: ea3743e7e794f04797f3b3183abb7fadc4f0007b (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
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 MediaTek Inc.

#include <asm/barrier.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/remoteproc/mtk_scp.h>
#include <linux/rpmsg/mtk_rpmsg.h>

#include "mtk_common.h"
#include "remoteproc_internal.h"

#define MAX_CODE_SIZE 0x500000
#define SCP_FW_END 0x7C000

/**
 * scp_get() - get a reference to SCP.
 *
 * @pdev:	the platform device of the module requesting SCP platform
 *		device for using SCP API.
 *
 * Return: Return NULL if failed.  otherwise reference to SCP.
 **/
struct mtk_scp *scp_get(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *scp_node;
	struct platform_device *scp_pdev;

	scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
	if (!scp_node) {
		dev_err(dev, "can't get SCP node\n");
		return NULL;
	}

	scp_pdev = of_find_device_by_node(scp_node);
	of_node_put(scp_node);

	if (WARN_ON(!scp_pdev)) {
		dev_err(dev, "SCP pdev failed\n");
		return NULL;
	}

	return platform_get_drvdata(scp_pdev);
}
EXPORT_SYMBOL_GPL(scp_get);

/**
 * scp_put() - "free" the SCP
 *
 * @scp:	mtk_scp structure from scp_get().
 **/
void scp_put(struct mtk_scp *scp)
{
	put_device(scp->dev);
}
EXPORT_SYMBOL_GPL(scp_put);

static void scp_wdt_handler(struct mtk_scp *scp, u32 scp_to_host)
{
	dev_err(scp->dev, "SCP watchdog timeout! 0x%x", scp_to_host);
	rproc_report_crash(scp->rproc, RPROC_WATCHDOG);
}

static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
{
	struct mtk_scp *scp = (struct mtk_scp *)priv;
	struct scp_run *run = (struct scp_run *)data;

	scp->run.signaled = run->signaled;
	strscpy(scp->run.fw_ver, run->fw_ver, SCP_FW_VER_LEN);
	scp->run.dec_capability = run->dec_capability;
	scp->run.enc_capability = run->enc_capability;
	wake_up_interruptible(&scp->run.wq);
}

static void scp_ipi_handler(struct mtk_scp *scp)
{
	struct mtk_share_obj __iomem *rcv_obj = scp->recv_buf;
	struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
	u8 tmp_data[SCP_SHARE_BUFFER_SIZE];
	scp_ipi_handler_t handler;
	u32 id = readl(&rcv_obj->id);
	u32 len = readl(&rcv_obj->len);

	if (len > SCP_SHARE_BUFFER_SIZE) {
		dev_err(scp->dev, "ipi message too long (len %d, max %d)", len,
			SCP_SHARE_BUFFER_SIZE);
		return;
	}
	if (id >= SCP_IPI_MAX) {
		dev_err(scp->dev, "No such ipi id = %d\n", id);
		return;
	}

	scp_ipi_lock(scp, id);
	handler = ipi_desc[id].handler;
	if (!handler) {
		dev_err(scp->dev, "No such ipi id = %d\n", id);
		scp_ipi_unlock(scp, id);
		return;
	}

	memcpy_fromio(tmp_data, &rcv_obj->share_buf, len);
	handler(tmp_data, len, ipi_desc[id].priv);
	scp_ipi_unlock(scp, id);

	scp->ipi_id_ack[id] = true;
	wake_up(&scp->ack_wq);
}

static int scp_ipi_init(struct mtk_scp *scp)
{
	size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj);
	size_t recv_offset = send_offset - sizeof(struct mtk_share_obj);

	/* Disable SCP to host interrupt */
	writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);

	/* shared buffer initialization */
	scp->recv_buf =
		(struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset);
	scp->send_buf =
		(struct mtk_share_obj __iomem *)(scp->sram_base + send_offset);
	memset_io(scp->recv_buf, 0, sizeof(scp->recv_buf));
	memset_io(scp->send_buf, 0, sizeof(scp->send_buf));

	return 0;
}

static void scp_reset_assert(const struct mtk_scp *scp)
{
	u32 val;

	val = readl(scp->reg_base + MT8183_SW_RSTN);
	val &= ~MT8183_SW_RSTN_BIT;
	writel(val, scp->reg_base + MT8183_SW_RSTN);
}

static void scp_reset_deassert(const struct mtk_scp *scp)
{
	u32 val;

	val = readl(scp->reg_base + MT8183_SW_RSTN);
	val |= MT8183_SW_RSTN_BIT;
	writel(val, scp->reg_base + MT8183_SW_RSTN);
}

static irqreturn_t scp_irq_handler(int irq, void *priv)
{
	struct mtk_scp *scp = priv;
	u32 scp_to_host;
	int ret;

	ret = clk_prepare_enable(scp->clk);
	if (ret) {
		dev_err(scp->dev, "failed to enable clocks\n");
		return IRQ_NONE;
	}

	scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
	if (scp_to_host & MT8183_SCP_IPC_INT_BIT)
		scp_ipi_handler(scp);
	else
		scp_wdt_handler(scp, scp_to_host);

	/* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
	writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
	       scp->reg_base + MT8183_SCP_TO_HOST);
	clk_disable_unprepare(scp->clk);

	return IRQ_HANDLED;
}

static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
{
	struct device *dev = &rproc->dev;
	struct elf32_hdr *ehdr;
	struct elf32_phdr *phdr;
	int i, ret = 0;
	const u8 *elf_data = fw->data;

	ehdr = (struct elf32_hdr *)elf_data;
	phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);

	/* go through the available ELF segments */
	for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
		u32 da = phdr->p_paddr;
		u32 memsz = phdr->p_memsz;
		u32 filesz = phdr->p_filesz;
		u32 offset = phdr->p_offset;
		void __iomem *ptr;

		if (phdr->p_type != PT_LOAD)
			continue;

		dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
			phdr->p_type, da, memsz, filesz);

		if (filesz > memsz) {
			dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
				filesz, memsz);
			ret = -EINVAL;
			break;
		}

		if (offset + filesz > fw->size) {
			dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
				offset + filesz, fw->size);
			ret = -EINVAL;
			break;
		}

		/* grab the kernel address for this device address */
		ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz);
		if (!ptr) {
			dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
			ret = -EINVAL;
			break;
		}

		/* put the segment where the remote processor expects it */
		if (phdr->p_filesz)
			scp_memcpy_aligned(ptr, elf_data + phdr->p_offset,
					   filesz);
	}

	return ret;
}

static int scp_load(struct rproc *rproc, const struct firmware *fw)
{
	const struct mtk_scp *scp = rproc->priv;
	struct device *dev = scp->dev;
	int ret;

	ret = clk_prepare_enable(scp->clk);
	if (ret) {
		dev_err(dev, "failed to enable clocks\n");
		return ret;
	}

	/* Hold SCP in reset while loading FW. */
	scp_reset_assert(scp);

	/* Reset clocks before loading FW */
	writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
	writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);

	/* Initialize TCM before loading FW. */
	writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
	writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);

	/* Turn on the power of SCP's SRAM before using it. */
	writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);

	/*
	 * Set I-cache and D-cache size before loading SCP FW.
	 * SCP SRAM logical address may change when cache size setting differs.
	 */
	writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
	       scp->reg_base + MT8183_SCP_CACHE_CON);
	writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);

	ret = scp_elf_load_segments(rproc, fw);
	clk_disable_unprepare(scp->clk);

	return ret;
}

static int scp_start(struct rproc *rproc)
{
	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
	struct device *dev = scp->dev;
	struct scp_run *run = &scp->run;
	int ret;

	ret = clk_prepare_enable(scp->clk);
	if (ret) {
		dev_err(dev, "failed to enable clocks\n");
		return ret;
	}

	run->signaled = false;

	scp_reset_deassert(scp);

	ret = wait_event_interruptible_timeout(
					run->wq,
					run->signaled,
					msecs_to_jiffies(2000));

	if (ret == 0) {
		dev_err(dev, "wait SCP initialization timeout!\n");
		ret = -ETIME;
		goto stop;
	}
	if (ret == -ERESTARTSYS) {
		dev_err(dev, "wait SCP interrupted by a signal!\n");
		goto stop;
	}
	clk_disable_unprepare(scp->clk);
	dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);

	return 0;

stop:
	scp_reset_assert(scp);
	clk_disable_unprepare(scp->clk);
	return ret;
}

static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len)
{
	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
	int offset;

	if (da < scp->sram_size) {
		offset = da;
		if (offset >= 0 && (offset + len) < scp->sram_size)
			return (void __force *)scp->sram_base + offset;
	} else {
		offset = da - scp->phys_addr;
		if (offset >= 0 && (offset + len) < scp->dram_size)
			return (void __force *)scp->cpu_addr + offset;
	}

	return NULL;
}

static int scp_stop(struct rproc *rproc)
{
	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
	int ret;

	ret = clk_prepare_enable(scp->clk);
	if (ret) {
		dev_err(scp->dev, "failed to enable clocks\n");
		return ret;
	}

	scp_reset_assert(scp);
	/* Disable SCP watchdog */
	writel(0, scp->reg_base + MT8183_WDT_CFG);
	clk_disable_unprepare(scp->clk);

	return 0;
}

static const struct rproc_ops scp_ops = {
	.start		= scp_start,
	.stop		= scp_stop,
	.load		= scp_load,
	.da_to_va	= scp_da_to_va,
};

/**
 * scp_get_device() - get device struct of SCP
 *
 * @scp:	mtk_scp structure
 **/
struct device *scp_get_device(struct mtk_scp *scp)
{
	return scp->dev;
}
EXPORT_SYMBOL_GPL(scp_get_device);

/**
 * scp_get_rproc() - get rproc struct of SCP
 *
 * @scp:	mtk_scp structure
 **/
struct rproc *scp_get_rproc(struct mtk_scp *scp)
{
	return scp->rproc;
}
EXPORT_SYMBOL_GPL(scp_get_rproc);

/**
 * scp_get_vdec_hw_capa() - get video decoder hardware capability
 *
 * @scp:	mtk_scp structure
 *
 * Return: video decoder hardware capability
 **/
unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
{
	return scp->run.dec_capability;
}
EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);

/**
 * scp_get_venc_hw_capa() - get video encoder hardware capability
 *
 * @scp:	mtk_scp structure
 *
 * Return: video encoder hardware capability
 **/
unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
{
	return scp->run.enc_capability;
}
EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);

/**
 * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
 *
 * @scp:	mtk_scp structure
 * @mem_addr:	SCP views memory address
 *
 * Mapping the SCP's SRAM address /
 * DMEM (Data Extended Memory) memory address /
 * Working buffer memory address to
 * kernel virtual address.
 *
 * Return: Return ERR_PTR(-EINVAL) if mapping failed,
 * otherwise the mapped kernel virtual address
 **/
void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
{
	void *ptr;

	ptr = scp_da_to_va(scp->rproc, mem_addr, 0);
	if (!ptr)
		return ERR_PTR(-EINVAL);

	return ptr;
}
EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);

static int scp_map_memory_region(struct mtk_scp *scp)
{
	int ret;

	ret = of_reserved_mem_device_init(scp->dev);
	if (ret) {
		dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
		return -ENOMEM;
	}

	/* Reserved SCP code size */
	scp->dram_size = MAX_CODE_SIZE;
	scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
					   &scp->phys_addr, GFP_KERNEL);
	if (!scp->cpu_addr)
		return -ENOMEM;

	return 0;
}

static void scp_unmap_memory_region(struct mtk_scp *scp)
{
	dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
			  scp->phys_addr);
	of_reserved_mem_device_release(scp->dev);
}

static int scp_register_ipi(struct platform_device *pdev, u32 id,
			    ipi_handler_t handler, void *priv)
{
	struct mtk_scp *scp = platform_get_drvdata(pdev);

	return scp_ipi_register(scp, id, handler, priv);
}

static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
{
	struct mtk_scp *scp = platform_get_drvdata(pdev);

	scp_ipi_unregister(scp, id);
}

static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
			unsigned int len, unsigned int wait)
{
	struct mtk_scp *scp = platform_get_drvdata(pdev);

	return scp_ipi_send(scp, id, buf, len, wait);
}

static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
	.send_ipi = scp_send_ipi,
	.register_ipi = scp_register_ipi,
	.unregister_ipi = scp_unregister_ipi,
	.ns_ipi_id = SCP_IPI_NS_SERVICE,
};

static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
{
	scp->rpmsg_subdev =
		mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
					      &mtk_scp_rpmsg_info);
	if (scp->rpmsg_subdev)
		rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
}

static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
{
	if (scp->rpmsg_subdev) {
		rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
		mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
		scp->rpmsg_subdev = NULL;
	}
}

static int scp_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct mtk_scp *scp;
	struct rproc *rproc;
	struct resource *res;
	char *fw_name = "scp.img";
	int ret, i;

	rproc = rproc_alloc(dev,
			    np->name,
			    &scp_ops,
			    fw_name,
			    sizeof(*scp));
	if (!rproc) {
		dev_err(dev, "unable to allocate remoteproc\n");
		return -ENOMEM;
	}

	scp = (struct mtk_scp *)rproc->priv;
	scp->rproc = rproc;
	scp->dev = dev;
	platform_set_drvdata(pdev, scp);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
	scp->sram_base = devm_ioremap_resource(dev, res);
	if (IS_ERR((__force void *)scp->sram_base)) {
		dev_err(dev, "Failed to parse and map sram memory\n");
		ret = PTR_ERR((__force void *)scp->sram_base);
		goto free_rproc;
	}
	scp->sram_size = resource_size(res);

	mutex_init(&scp->send_lock);
	for (i = 0; i < SCP_IPI_MAX; i++)
		mutex_init(&scp->ipi_desc[i].lock);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
	scp->reg_base = devm_ioremap_resource(dev, res);
	if (IS_ERR((__force void *)scp->reg_base)) {
		dev_err(dev, "Failed to parse and map cfg memory\n");
		ret = PTR_ERR((__force void *)scp->reg_base);
		goto destroy_mutex;
	}

	ret = scp_map_memory_region(scp);
	if (ret)
		goto destroy_mutex;

	scp->clk = devm_clk_get(dev, "main");
	if (IS_ERR(scp->clk)) {
		dev_err(dev, "Failed to get clock\n");
		ret = PTR_ERR(scp->clk);
		goto release_dev_mem;
	}

	ret = clk_prepare_enable(scp->clk);
	if (ret) {
		dev_err(dev, "failed to enable clocks\n");
		goto release_dev_mem;
	}

	ret = scp_ipi_init(scp);
	clk_disable_unprepare(scp->clk);
	if (ret) {
		dev_err(dev, "Failed to init ipi\n");
		goto release_dev_mem;
	}

	/* register SCP initialization IPI */
	ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
	if (ret) {
		dev_err(dev, "Failed to register IPI_SCP_INIT\n");
		goto release_dev_mem;
	}

	init_waitqueue_head(&scp->run.wq);
	init_waitqueue_head(&scp->ack_wq);

	scp_add_rpmsg_subdev(scp);

	ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
					scp_irq_handler, IRQF_ONESHOT,
					pdev->name, scp);

	if (ret) {
		dev_err(dev, "failed to request irq\n");
		goto remove_subdev;
	}

	ret = rproc_add(rproc);
	if (ret)
		goto remove_subdev;

	return 0;

remove_subdev:
	scp_remove_rpmsg_subdev(scp);
	scp_ipi_unregister(scp, SCP_IPI_INIT);
release_dev_mem:
	scp_unmap_memory_region(scp);
destroy_mutex:
	for (i = 0; i < SCP_IPI_MAX; i++)
		mutex_destroy(&scp->ipi_desc[i].lock);
	mutex_destroy(&scp->send_lock);
free_rproc:
	rproc_free(rproc);

	return ret;
}

static int scp_remove(struct platform_device *pdev)
{
	struct mtk_scp *scp = platform_get_drvdata(pdev);
	int i;

	rproc_del(scp->rproc);
	scp_remove_rpmsg_subdev(scp);
	scp_ipi_unregister(scp, SCP_IPI_INIT);
	scp_unmap_memory_region(scp);
	for (i = 0; i < SCP_IPI_MAX; i++)
		mutex_destroy(&scp->ipi_desc[i].lock);
	mutex_destroy(&scp->send_lock);
	rproc_free(scp->rproc);

	return 0;
}

static const struct of_device_id mtk_scp_of_match[] = {
	{ .compatible = "mediatek,mt8183-scp"},
	{},
};
MODULE_DEVICE_TABLE(of, mtk_scp_of_match);

static struct platform_driver mtk_scp_driver = {
	.probe = scp_probe,
	.remove = scp_remove,
	.driver = {
		.name = "mtk-scp",
		.of_match_table = of_match_ptr(mtk_scp_of_match),
	},
};

module_platform_driver(mtk_scp_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek SCP control driver");