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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / remoteproc / mtk_scp.c
blobe0c2356903616e2e02b15378df4df15de4d9ec78
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2019 MediaTek Inc.
4
5 #include <asm/barrier.h>
6 #include <linux/clk.h>
7 #include <linux/dma-mapping.h>
8 #include <linux/err.h>
9 #include <linux/interrupt.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/of_address.h>
13 #include <linux/of_platform.h>
14 #include <linux/of_reserved_mem.h>
15 #include <linux/platform_device.h>
16 #include <linux/remoteproc.h>
17 #include <linux/remoteproc/mtk_scp.h>
18 #include <linux/rpmsg/mtk_rpmsg.h>
19
20 #include "mtk_common.h"
21 #include "remoteproc_internal.h"
22
23 #define MAX_CODE_SIZE 0x500000
24 #define SECTION_NAME_IPI_BUFFER ".ipi_buffer"
25
26 /**
27 * scp_get() - get a reference to SCP.
28 *
29 * @pdev: the platform device of the module requesting SCP platform
30 * device for using SCP API.
31 *
32 * Return: Return NULL if failed. otherwise reference to SCP.
33 **/
34 struct mtk_scp *scp_get(struct platform_device *pdev)
35 {
36 struct device *dev = &pdev->dev;
37 struct device_node *scp_node;
38 struct platform_device *scp_pdev;
39
40 scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
41 if (!scp_node) {
42 dev_err(dev, "can't get SCP node\n");
43 return NULL;
44 }
45
46 scp_pdev = of_find_device_by_node(scp_node);
47 of_node_put(scp_node);
48
49 if (WARN_ON(!scp_pdev)) {
50 dev_err(dev, "SCP pdev failed\n");
51 return NULL;
52 }
53
54 return platform_get_drvdata(scp_pdev);
55 }
56 EXPORT_SYMBOL_GPL(scp_get);
57
58 /**
59 * scp_put() - "free" the SCP
60 *
61 * @scp: mtk_scp structure from scp_get().
62 **/
63 void scp_put(struct mtk_scp *scp)
64 {
65 put_device(scp->dev);
66 }
67 EXPORT_SYMBOL_GPL(scp_put);
68
69 static void scp_wdt_handler(struct mtk_scp *scp, u32 scp_to_host)
70 {
71 dev_err(scp->dev, "SCP watchdog timeout! 0x%x", scp_to_host);
72 rproc_report_crash(scp->rproc, RPROC_WATCHDOG);
73 }
74
75 static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
76 {
77 struct mtk_scp *scp = (struct mtk_scp *)priv;
78 struct scp_run *run = (struct scp_run *)data;
79
80 scp->run.signaled = run->signaled;
81 strscpy(scp->run.fw_ver, run->fw_ver, SCP_FW_VER_LEN);
82 scp->run.dec_capability = run->dec_capability;
83 scp->run.enc_capability = run->enc_capability;
84 wake_up_interruptible(&scp->run.wq);
85 }
86
87 static void scp_ipi_handler(struct mtk_scp *scp)
88 {
89 struct mtk_share_obj __iomem *rcv_obj = scp->recv_buf;
90 struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
91 u8 tmp_data[SCP_SHARE_BUFFER_SIZE];
92 scp_ipi_handler_t handler;
93 u32 id = readl(&rcv_obj->id);
94 u32 len = readl(&rcv_obj->len);
95
96 if (len > SCP_SHARE_BUFFER_SIZE) {
97 dev_err(scp->dev, "ipi message too long (len %d, max %d)", len,
98 SCP_SHARE_BUFFER_SIZE);
99 return;
100 }
101 if (id >= SCP_IPI_MAX) {
102 dev_err(scp->dev, "No such ipi id = %d\n", id);
103 return;
104 }
105
106 scp_ipi_lock(scp, id);
107 handler = ipi_desc[id].handler;
108 if (!handler) {
109 dev_err(scp->dev, "No such ipi id = %d\n", id);
110 scp_ipi_unlock(scp, id);
111 return;
112 }
113
114 memcpy_fromio(tmp_data, &rcv_obj->share_buf, len);
115 handler(tmp_data, len, ipi_desc[id].priv);
116 scp_ipi_unlock(scp, id);
117
118 scp->ipi_id_ack[id] = true;
119 wake_up(&scp->ack_wq);
120 }
121
122 static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,
123 const struct firmware *fw,
124 size_t *offset);
125
126 static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw)
127 {
128 int ret;
129 size_t offset;
130
131 /* read the ipi buf addr from FW itself first */
132 ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset);
133 if (ret) {
134 /* use default ipi buf addr if the FW doesn't have it */
135 offset = scp->data->ipi_buf_offset;
136 if (!offset)
137 return ret;
138 }
139 dev_info(scp->dev, "IPI buf addr %#010zx\n", offset);
140
141 scp->recv_buf = (struct mtk_share_obj __iomem *)
142 (scp->sram_base + offset);
143 scp->send_buf = (struct mtk_share_obj __iomem *)
144 (scp->sram_base + offset + sizeof(*scp->recv_buf));
145 memset_io(scp->recv_buf, 0, sizeof(*scp->recv_buf));
146 memset_io(scp->send_buf, 0, sizeof(*scp->send_buf));
147
148 return 0;
149 }
150
151 static void mt8183_scp_reset_assert(struct mtk_scp *scp)
152 {
153 u32 val;
154
155 val = readl(scp->reg_base + MT8183_SW_RSTN);
156 val &= ~MT8183_SW_RSTN_BIT;
157 writel(val, scp->reg_base + MT8183_SW_RSTN);
158 }
159
160 static void mt8183_scp_reset_deassert(struct mtk_scp *scp)
161 {
162 u32 val;
163
164 val = readl(scp->reg_base + MT8183_SW_RSTN);
165 val |= MT8183_SW_RSTN_BIT;
166 writel(val, scp->reg_base + MT8183_SW_RSTN);
167 }
168
169 static void mt8192_scp_reset_assert(struct mtk_scp *scp)
170 {
171 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
172 }
173
174 static void mt8192_scp_reset_deassert(struct mtk_scp *scp)
175 {
176 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_CLR);
177 }
178
179 static void mt8183_scp_irq_handler(struct mtk_scp *scp)
180 {
181 u32 scp_to_host;
182
183 scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
184 if (scp_to_host & MT8183_SCP_IPC_INT_BIT)
185 scp_ipi_handler(scp);
186 else
187 scp_wdt_handler(scp, scp_to_host);
188
189 /* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
190 writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
191 scp->reg_base + MT8183_SCP_TO_HOST);
192 }
193
194 static void mt8192_scp_irq_handler(struct mtk_scp *scp)
195 {
196 u32 scp_to_host;
197
198 scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
199
200 if (scp_to_host & MT8192_SCP_IPC_INT_BIT)
201 scp_ipi_handler(scp);
202 else
203 scp_wdt_handler(scp, scp_to_host);
204
205 /*
206 * SCP won't send another interrupt until we clear
207 * MT8192_SCP2APMCU_IPC.
208 */
209 writel(MT8192_SCP_IPC_INT_BIT,
210 scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
211 }
212
213 static irqreturn_t scp_irq_handler(int irq, void *priv)
214 {
215 struct mtk_scp *scp = priv;
216 int ret;
217
218 ret = clk_prepare_enable(scp->clk);
219 if (ret) {
220 dev_err(scp->dev, "failed to enable clocks\n");
221 return IRQ_NONE;
222 }
223
224 scp->data->scp_irq_handler(scp);
225
226 clk_disable_unprepare(scp->clk);
227
228 return IRQ_HANDLED;
229 }
230
231 static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
232 {
233 struct device *dev = &rproc->dev;
234 struct elf32_hdr *ehdr;
235 struct elf32_phdr *phdr;
236 int i, ret = 0;
237 const u8 *elf_data = fw->data;
238
239 ehdr = (struct elf32_hdr *)elf_data;
240 phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
241
242 /* go through the available ELF segments */
243 for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
244 u32 da = phdr->p_paddr;
245 u32 memsz = phdr->p_memsz;
246 u32 filesz = phdr->p_filesz;
247 u32 offset = phdr->p_offset;
248 void __iomem *ptr;
249
250 dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
251 phdr->p_type, da, memsz, filesz);
252
253 if (phdr->p_type != PT_LOAD)
254 continue;
255 if (!filesz)
256 continue;
257
258 if (filesz > memsz) {
259 dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
260 filesz, memsz);
261 ret = -EINVAL;
262 break;
263 }
264
265 if (offset + filesz > fw->size) {
266 dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
267 offset + filesz, fw->size);
268 ret = -EINVAL;
269 break;
270 }
271
272 /* grab the kernel address for this device address */
273 ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz);
274 if (!ptr) {
275 dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
276 ret = -EINVAL;
277 break;
278 }
279
280 /* put the segment where the remote processor expects it */
281 scp_memcpy_aligned(ptr, elf_data + phdr->p_offset, filesz);
282 }
283
284 return ret;
285 }
286
287 static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,
288 const struct firmware *fw,
289 size_t *offset)
290 {
291 struct elf32_hdr *ehdr;
292 struct elf32_shdr *shdr, *shdr_strtab;
293 int i;
294 const u8 *elf_data = fw->data;
295 const char *strtab;
296
297 ehdr = (struct elf32_hdr *)elf_data;
298 shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
299 shdr_strtab = shdr + ehdr->e_shstrndx;
300 strtab = (const char *)(elf_data + shdr_strtab->sh_offset);
301
302 for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
303 if (strcmp(strtab + shdr->sh_name,
304 SECTION_NAME_IPI_BUFFER) == 0) {
305 *offset = shdr->sh_addr;
306 return 0;
307 }
308 }
309
310 return -ENOENT;
311 }
312
313 static int mt8183_scp_before_load(struct mtk_scp *scp)
314 {
315 /* Clear SCP to host interrupt */
316 writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
317
318 /* Reset clocks before loading FW */
319 writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
320 writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
321
322 /* Initialize TCM before loading FW. */
323 writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
324 writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
325
326 /* Turn on the power of SCP's SRAM before using it. */
327 writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
328
329 /*
330 * Set I-cache and D-cache size before loading SCP FW.
331 * SCP SRAM logical address may change when cache size setting differs.
332 */
333 writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
334 scp->reg_base + MT8183_SCP_CACHE_CON);
335 writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
336
337 return 0;
338 }
339
340 static void mt8192_power_on_sram(void __iomem *addr)
341 {
342 int i;
343
344 for (i = 31; i >= 0; i--)
345 writel(GENMASK(i, 0), addr);
346 writel(0, addr);
347 }
348
349 static void mt8192_power_off_sram(void __iomem *addr)
350 {
351 int i;
352
353 writel(0, addr);
354 for (i = 0; i < 32; i++)
355 writel(GENMASK(i, 0), addr);
356 }
357
358 static int mt8192_scp_before_load(struct mtk_scp *scp)
359 {
360 /* clear SPM interrupt, SCP2SPM_IPC_CLR */
361 writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
362
363 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
364
365 /* enable SRAM clock */
366 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
367 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
368 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
369 mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
370 mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
371
372 return 0;
373 }
374
375 static int scp_load(struct rproc *rproc, const struct firmware *fw)
376 {
377 struct mtk_scp *scp = rproc->priv;
378 struct device *dev = scp->dev;
379 int ret;
380
381 ret = clk_prepare_enable(scp->clk);
382 if (ret) {
383 dev_err(dev, "failed to enable clocks\n");
384 return ret;
385 }
386
387 /* Hold SCP in reset while loading FW. */
388 scp->data->scp_reset_assert(scp);
389
390 ret = scp->data->scp_before_load(scp);
391 if (ret < 0)
392 goto leave;
393
394 ret = scp_elf_load_segments(rproc, fw);
395 leave:
396 clk_disable_unprepare(scp->clk);
397
398 return ret;
399 }
400
401 static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw)
402 {
403 struct mtk_scp *scp = rproc->priv;
404 struct device *dev = scp->dev;
405 int ret;
406
407 ret = clk_prepare_enable(scp->clk);
408 if (ret) {
409 dev_err(dev, "failed to enable clocks\n");
410 return ret;
411 }
412
413 ret = scp_ipi_init(scp, fw);
414 clk_disable_unprepare(scp->clk);
415 return ret;
416 }
417
418 static int scp_start(struct rproc *rproc)
419 {
420 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
421 struct device *dev = scp->dev;
422 struct scp_run *run = &scp->run;
423 int ret;
424
425 ret = clk_prepare_enable(scp->clk);
426 if (ret) {
427 dev_err(dev, "failed to enable clocks\n");
428 return ret;
429 }
430
431 run->signaled = false;
432
433 scp->data->scp_reset_deassert(scp);
434
435 ret = wait_event_interruptible_timeout(
436 run->wq,
437 run->signaled,
438 msecs_to_jiffies(2000));
439
440 if (ret == 0) {
441 dev_err(dev, "wait SCP initialization timeout!\n");
442 ret = -ETIME;
443 goto stop;
444 }
445 if (ret == -ERESTARTSYS) {
446 dev_err(dev, "wait SCP interrupted by a signal!\n");
447 goto stop;
448 }
449
450 clk_disable_unprepare(scp->clk);
451 dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
452
453 return 0;
454
455 stop:
456 scp->data->scp_reset_assert(scp);
457 clk_disable_unprepare(scp->clk);
458 return ret;
459 }
460
461 static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len)
462 {
463 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
464 int offset;
465
466 if (da < scp->sram_size) {
467 offset = da;
468 if (offset >= 0 && (offset + len) <= scp->sram_size)
469 return (void __force *)scp->sram_base + offset;
470 } else if (scp->dram_size) {
471 offset = da - scp->dma_addr;
472 if (offset >= 0 && (offset + len) <= scp->dram_size)
473 return scp->cpu_addr + offset;
474 }
475
476 return NULL;
477 }
478
479 static void mt8183_scp_stop(struct mtk_scp *scp)
480 {
481 /* Disable SCP watchdog */
482 writel(0, scp->reg_base + MT8183_WDT_CFG);
483 }
484
485 static void mt8192_scp_stop(struct mtk_scp *scp)
486 {
487 /* Disable SRAM clock */
488 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
489 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
490 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
491 mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
492 mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
493
494 /* Disable SCP watchdog */
495 writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
496 }
497
498 static int scp_stop(struct rproc *rproc)
499 {
500 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
501 int ret;
502
503 ret = clk_prepare_enable(scp->clk);
504 if (ret) {
505 dev_err(scp->dev, "failed to enable clocks\n");
506 return ret;
507 }
508
509 scp->data->scp_reset_assert(scp);
510 scp->data->scp_stop(scp);
511 clk_disable_unprepare(scp->clk);
512
513 return 0;
514 }
515
516 static const struct rproc_ops scp_ops = {
517 .start = scp_start,
518 .stop = scp_stop,
519 .load = scp_load,
520 .da_to_va = scp_da_to_va,
521 .parse_fw = scp_parse_fw,
522 };
523
524 /**
525 * scp_get_device() - get device struct of SCP
526 *
527 * @scp: mtk_scp structure
528 **/
529 struct device *scp_get_device(struct mtk_scp *scp)
530 {
531 return scp->dev;
532 }
533 EXPORT_SYMBOL_GPL(scp_get_device);
534
535 /**
536 * scp_get_rproc() - get rproc struct of SCP
537 *
538 * @scp: mtk_scp structure
539 **/
540 struct rproc *scp_get_rproc(struct mtk_scp *scp)
541 {
542 return scp->rproc;
543 }
544 EXPORT_SYMBOL_GPL(scp_get_rproc);
545
546 /**
547 * scp_get_vdec_hw_capa() - get video decoder hardware capability
548 *
549 * @scp: mtk_scp structure
550 *
551 * Return: video decoder hardware capability
552 **/
553 unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
554 {
555 return scp->run.dec_capability;
556 }
557 EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
558
559 /**
560 * scp_get_venc_hw_capa() - get video encoder hardware capability
561 *
562 * @scp: mtk_scp structure
563 *
564 * Return: video encoder hardware capability
565 **/
566 unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
567 {
568 return scp->run.enc_capability;
569 }
570 EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
571
572 /**
573 * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
574 *
575 * @scp: mtk_scp structure
576 * @mem_addr: SCP views memory address
577 *
578 * Mapping the SCP's SRAM address /
579 * DMEM (Data Extended Memory) memory address /
580 * Working buffer memory address to
581 * kernel virtual address.
582 *
583 * Return: Return ERR_PTR(-EINVAL) if mapping failed,
584 * otherwise the mapped kernel virtual address
585 **/
586 void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
587 {
588 void *ptr;
589
590 ptr = scp_da_to_va(scp->rproc, mem_addr, 0);
591 if (!ptr)
592 return ERR_PTR(-EINVAL);
593
594 return ptr;
595 }
596 EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
597
598 static int scp_map_memory_region(struct mtk_scp *scp)
599 {
600 int ret;
601
602 ret = of_reserved_mem_device_init(scp->dev);
603
604 /* reserved memory is optional. */
605 if (ret == -ENODEV) {
606 dev_info(scp->dev, "skipping reserved memory initialization.");
607 return 0;
608 }
609
610 if (ret) {
611 dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
612 return -ENOMEM;
613 }
614
615 /* Reserved SCP code size */
616 scp->dram_size = MAX_CODE_SIZE;
617 scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
618 &scp->dma_addr, GFP_KERNEL);
619 if (!scp->cpu_addr)
620 return -ENOMEM;
621
622 return 0;
623 }
624
625 static void scp_unmap_memory_region(struct mtk_scp *scp)
626 {
627 if (scp->dram_size == 0)
628 return;
629
630 dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
631 scp->dma_addr);
632 of_reserved_mem_device_release(scp->dev);
633 }
634
635 static int scp_register_ipi(struct platform_device *pdev, u32 id,
636 ipi_handler_t handler, void *priv)
637 {
638 struct mtk_scp *scp = platform_get_drvdata(pdev);
639
640 return scp_ipi_register(scp, id, handler, priv);
641 }
642
643 static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
644 {
645 struct mtk_scp *scp = platform_get_drvdata(pdev);
646
647 scp_ipi_unregister(scp, id);
648 }
649
650 static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
651 unsigned int len, unsigned int wait)
652 {
653 struct mtk_scp *scp = platform_get_drvdata(pdev);
654
655 return scp_ipi_send(scp, id, buf, len, wait);
656 }
657
658 static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
659 .send_ipi = scp_send_ipi,
660 .register_ipi = scp_register_ipi,
661 .unregister_ipi = scp_unregister_ipi,
662 .ns_ipi_id = SCP_IPI_NS_SERVICE,
663 };
664
665 static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
666 {
667 scp->rpmsg_subdev =
668 mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
669 &mtk_scp_rpmsg_info);
670 if (scp->rpmsg_subdev)
671 rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
672 }
673
674 static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
675 {
676 if (scp->rpmsg_subdev) {
677 rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
678 mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
679 scp->rpmsg_subdev = NULL;
680 }
681 }
682
683 static int scp_probe(struct platform_device *pdev)
684 {
685 struct device *dev = &pdev->dev;
686 struct device_node *np = dev->of_node;
687 struct mtk_scp *scp;
688 struct rproc *rproc;
689 struct resource *res;
690 char *fw_name = "scp.img";
691 int ret, i;
692
693 rproc = rproc_alloc(dev,
694 np->name,
695 &scp_ops,
696 fw_name,
697 sizeof(*scp));
698 if (!rproc) {
699 dev_err(dev, "unable to allocate remoteproc\n");
700 return -ENOMEM;
701 }
702
703 scp = (struct mtk_scp *)rproc->priv;
704 scp->rproc = rproc;
705 scp->dev = dev;
706 scp->data = of_device_get_match_data(dev);
707 platform_set_drvdata(pdev, scp);
708
709 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
710 scp->sram_base = devm_ioremap_resource(dev, res);
711 if (IS_ERR((__force void *)scp->sram_base)) {
712 dev_err(dev, "Failed to parse and map sram memory\n");
713 ret = PTR_ERR((__force void *)scp->sram_base);
714 goto free_rproc;
715 }
716 scp->sram_size = resource_size(res);
717
718 mutex_init(&scp->send_lock);
719 for (i = 0; i < SCP_IPI_MAX; i++)
720 mutex_init(&scp->ipi_desc[i].lock);
721
722 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
723 scp->reg_base = devm_ioremap_resource(dev, res);
724 if (IS_ERR((__force void *)scp->reg_base)) {
725 dev_err(dev, "Failed to parse and map cfg memory\n");
726 ret = PTR_ERR((__force void *)scp->reg_base);
727 goto destroy_mutex;
728 }
729
730 ret = scp_map_memory_region(scp);
731 if (ret)
732 goto destroy_mutex;
733
734 scp->clk = devm_clk_get(dev, "main");
735 if (IS_ERR(scp->clk)) {
736 dev_err(dev, "Failed to get clock\n");
737 ret = PTR_ERR(scp->clk);
738 goto release_dev_mem;
739 }
740
741 /* register SCP initialization IPI */
742 ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
743 if (ret) {
744 dev_err(dev, "Failed to register IPI_SCP_INIT\n");
745 goto release_dev_mem;
746 }
747
748 init_waitqueue_head(&scp->run.wq);
749 init_waitqueue_head(&scp->ack_wq);
750
751 scp_add_rpmsg_subdev(scp);
752
753 ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
754 scp_irq_handler, IRQF_ONESHOT,
755 pdev->name, scp);
756
757 if (ret) {
758 dev_err(dev, "failed to request irq\n");
759 goto remove_subdev;
760 }
761
762 ret = rproc_add(rproc);
763 if (ret)
764 goto remove_subdev;
765
766 return 0;
767
768 remove_subdev:
769 scp_remove_rpmsg_subdev(scp);
770 scp_ipi_unregister(scp, SCP_IPI_INIT);
771 release_dev_mem:
772 scp_unmap_memory_region(scp);
773 destroy_mutex:
774 for (i = 0; i < SCP_IPI_MAX; i++)
775 mutex_destroy(&scp->ipi_desc[i].lock);
776 mutex_destroy(&scp->send_lock);
777 free_rproc:
778 rproc_free(rproc);
779
780 return ret;
781 }
782
783 static int scp_remove(struct platform_device *pdev)
784 {
785 struct mtk_scp *scp = platform_get_drvdata(pdev);
786 int i;
787
788 rproc_del(scp->rproc);
789 scp_remove_rpmsg_subdev(scp);
790 scp_ipi_unregister(scp, SCP_IPI_INIT);
791 scp_unmap_memory_region(scp);
792 for (i = 0; i < SCP_IPI_MAX; i++)
793 mutex_destroy(&scp->ipi_desc[i].lock);
794 mutex_destroy(&scp->send_lock);
795 rproc_free(scp->rproc);
796
797 return 0;
798 }
799
800 static const struct mtk_scp_of_data mt8183_of_data = {
801 .scp_before_load = mt8183_scp_before_load,
802 .scp_irq_handler = mt8183_scp_irq_handler,
803 .scp_reset_assert = mt8183_scp_reset_assert,
804 .scp_reset_deassert = mt8183_scp_reset_deassert,
805 .scp_stop = mt8183_scp_stop,
806 .host_to_scp_reg = MT8183_HOST_TO_SCP,
807 .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
808 .ipi_buf_offset = 0x7bdb0,
809 };
810
811 static const struct mtk_scp_of_data mt8192_of_data = {
812 .scp_before_load = mt8192_scp_before_load,
813 .scp_irq_handler = mt8192_scp_irq_handler,
814 .scp_reset_assert = mt8192_scp_reset_assert,
815 .scp_reset_deassert = mt8192_scp_reset_deassert,
816 .scp_stop = mt8192_scp_stop,
817 .host_to_scp_reg = MT8192_GIPC_IN_SET,
818 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
819 };
820
821 static const struct of_device_id mtk_scp_of_match[] = {
822 { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
823 { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
824 {},
825 };
826 MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
827
828 static struct platform_driver mtk_scp_driver = {
829 .probe = scp_probe,
830 .remove = scp_remove,
831 .driver = {
832 .name = "mtk-scp",
833 .of_match_table = mtk_scp_of_match,
834 },
835 };
836
837 module_platform_driver(mtk_scp_driver);
838
839 MODULE_LICENSE("GPL v2");
840 MODULE_DESCRIPTION("MediaTek SCP control driver");
Linux with added FPC-III support