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 **/
scp_get(struct platform_device * pdev)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 **/
scp_put(struct mtk_scp * scp)63 void scp_put(struct mtk_scp *scp)
64 {
65 put_device(scp->dev);
66 }
67 EXPORT_SYMBOL_GPL(scp_put);
68
scp_wdt_handler(struct mtk_scp * scp,u32 scp_to_host)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
scp_init_ipi_handler(void * data,unsigned int len,void * priv)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
scp_ipi_handler(struct mtk_scp * scp)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
scp_ipi_init(struct mtk_scp * scp,const struct firmware * fw)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
mt8183_scp_reset_assert(struct mtk_scp * scp)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
mt8183_scp_reset_deassert(struct mtk_scp * scp)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
mt8192_scp_reset_assert(struct mtk_scp * scp)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
mt8192_scp_reset_deassert(struct mtk_scp * scp)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
mt8183_scp_irq_handler(struct mtk_scp * scp)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
mt8192_scp_irq_handler(struct mtk_scp * scp)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
203 /*
204 * SCP won't send another interrupt until we clear
205 * MT8192_SCP2APMCU_IPC.
206 */
207 writel(MT8192_SCP_IPC_INT_BIT,
208 scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
209 } else {
210 scp_wdt_handler(scp, scp_to_host);
211 writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ);
212 }
213 }
214
scp_irq_handler(int irq,void * priv)215 static irqreturn_t scp_irq_handler(int irq, void *priv)
216 {
217 struct mtk_scp *scp = priv;
218 int ret;
219
220 ret = clk_prepare_enable(scp->clk);
221 if (ret) {
222 dev_err(scp->dev, "failed to enable clocks\n");
223 return IRQ_NONE;
224 }
225
226 scp->data->scp_irq_handler(scp);
227
228 clk_disable_unprepare(scp->clk);
229
230 return IRQ_HANDLED;
231 }
232
scp_elf_load_segments(struct rproc * rproc,const struct firmware * fw)233 static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
234 {
235 struct device *dev = &rproc->dev;
236 struct elf32_hdr *ehdr;
237 struct elf32_phdr *phdr;
238 int i, ret = 0;
239 const u8 *elf_data = fw->data;
240
241 ehdr = (struct elf32_hdr *)elf_data;
242 phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
243
244 /* go through the available ELF segments */
245 for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
246 u32 da = phdr->p_paddr;
247 u32 memsz = phdr->p_memsz;
248 u32 filesz = phdr->p_filesz;
249 u32 offset = phdr->p_offset;
250 void __iomem *ptr;
251
252 dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
253 phdr->p_type, da, memsz, filesz);
254
255 if (phdr->p_type != PT_LOAD)
256 continue;
257 if (!filesz)
258 continue;
259
260 if (filesz > memsz) {
261 dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
262 filesz, memsz);
263 ret = -EINVAL;
264 break;
265 }
266
267 if (offset + filesz > fw->size) {
268 dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
269 offset + filesz, fw->size);
270 ret = -EINVAL;
271 break;
272 }
273
274 /* grab the kernel address for this device address */
275 ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz, NULL);
276 if (!ptr) {
277 dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
278 ret = -EINVAL;
279 break;
280 }
281
282 /* put the segment where the remote processor expects it */
283 scp_memcpy_aligned(ptr, elf_data + phdr->p_offset, filesz);
284 }
285
286 return ret;
287 }
288
scp_elf_read_ipi_buf_addr(struct mtk_scp * scp,const struct firmware * fw,size_t * offset)289 static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,
290 const struct firmware *fw,
291 size_t *offset)
292 {
293 struct elf32_hdr *ehdr;
294 struct elf32_shdr *shdr, *shdr_strtab;
295 int i;
296 const u8 *elf_data = fw->data;
297 const char *strtab;
298
299 ehdr = (struct elf32_hdr *)elf_data;
300 shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
301 shdr_strtab = shdr + ehdr->e_shstrndx;
302 strtab = (const char *)(elf_data + shdr_strtab->sh_offset);
303
304 for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
305 if (strcmp(strtab + shdr->sh_name,
306 SECTION_NAME_IPI_BUFFER) == 0) {
307 *offset = shdr->sh_addr;
308 return 0;
309 }
310 }
311
312 return -ENOENT;
313 }
314
mt8183_scp_clk_get(struct mtk_scp * scp)315 static int mt8183_scp_clk_get(struct mtk_scp *scp)
316 {
317 struct device *dev = scp->dev;
318 int ret = 0;
319
320 scp->clk = devm_clk_get(dev, "main");
321 if (IS_ERR(scp->clk)) {
322 dev_err(dev, "Failed to get clock\n");
323 ret = PTR_ERR(scp->clk);
324 }
325
326 return ret;
327 }
328
mt8192_scp_clk_get(struct mtk_scp * scp)329 static int mt8192_scp_clk_get(struct mtk_scp *scp)
330 {
331 return mt8183_scp_clk_get(scp);
332 }
333
mt8195_scp_clk_get(struct mtk_scp * scp)334 static int mt8195_scp_clk_get(struct mtk_scp *scp)
335 {
336 scp->clk = NULL;
337
338 return 0;
339 }
340
mt8183_scp_before_load(struct mtk_scp * scp)341 static int mt8183_scp_before_load(struct mtk_scp *scp)
342 {
343 /* Clear SCP to host interrupt */
344 writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
345
346 /* Reset clocks before loading FW */
347 writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
348 writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
349
350 /* Initialize TCM before loading FW. */
351 writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
352 writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
353
354 /* Turn on the power of SCP's SRAM before using it. */
355 writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
356
357 /*
358 * Set I-cache and D-cache size before loading SCP FW.
359 * SCP SRAM logical address may change when cache size setting differs.
360 */
361 writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
362 scp->reg_base + MT8183_SCP_CACHE_CON);
363 writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
364
365 return 0;
366 }
367
mt8192_power_on_sram(void __iomem * addr)368 static void mt8192_power_on_sram(void __iomem *addr)
369 {
370 int i;
371
372 for (i = 31; i >= 0; i--)
373 writel(GENMASK(i, 0), addr);
374 writel(0, addr);
375 }
376
mt8192_power_off_sram(void __iomem * addr)377 static void mt8192_power_off_sram(void __iomem *addr)
378 {
379 int i;
380
381 writel(0, addr);
382 for (i = 0; i < 32; i++)
383 writel(GENMASK(i, 0), addr);
384 }
385
mt8192_scp_before_load(struct mtk_scp * scp)386 static int mt8192_scp_before_load(struct mtk_scp *scp)
387 {
388 /* clear SPM interrupt, SCP2SPM_IPC_CLR */
389 writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
390
391 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
392
393 /* enable SRAM clock */
394 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
395 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
396 mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
397 mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
398 mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
399
400 /* enable MPU for all memory regions */
401 writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
402
403 return 0;
404 }
405
scp_load(struct rproc * rproc,const struct firmware * fw)406 static int scp_load(struct rproc *rproc, const struct firmware *fw)
407 {
408 struct mtk_scp *scp = rproc->priv;
409 struct device *dev = scp->dev;
410 int ret;
411
412 ret = clk_prepare_enable(scp->clk);
413 if (ret) {
414 dev_err(dev, "failed to enable clocks\n");
415 return ret;
416 }
417
418 /* Hold SCP in reset while loading FW. */
419 scp->data->scp_reset_assert(scp);
420
421 ret = scp->data->scp_before_load(scp);
422 if (ret < 0)
423 goto leave;
424
425 ret = scp_elf_load_segments(rproc, fw);
426 leave:
427 clk_disable_unprepare(scp->clk);
428
429 return ret;
430 }
431
scp_parse_fw(struct rproc * rproc,const struct firmware * fw)432 static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw)
433 {
434 struct mtk_scp *scp = rproc->priv;
435 struct device *dev = scp->dev;
436 int ret;
437
438 ret = clk_prepare_enable(scp->clk);
439 if (ret) {
440 dev_err(dev, "failed to enable clocks\n");
441 return ret;
442 }
443
444 ret = scp_ipi_init(scp, fw);
445 clk_disable_unprepare(scp->clk);
446 return ret;
447 }
448
scp_start(struct rproc * rproc)449 static int scp_start(struct rproc *rproc)
450 {
451 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
452 struct device *dev = scp->dev;
453 struct scp_run *run = &scp->run;
454 int ret;
455
456 ret = clk_prepare_enable(scp->clk);
457 if (ret) {
458 dev_err(dev, "failed to enable clocks\n");
459 return ret;
460 }
461
462 run->signaled = false;
463
464 scp->data->scp_reset_deassert(scp);
465
466 ret = wait_event_interruptible_timeout(
467 run->wq,
468 run->signaled,
469 msecs_to_jiffies(2000));
470
471 if (ret == 0) {
472 dev_err(dev, "wait SCP initialization timeout!\n");
473 ret = -ETIME;
474 goto stop;
475 }
476 if (ret == -ERESTARTSYS) {
477 dev_err(dev, "wait SCP interrupted by a signal!\n");
478 goto stop;
479 }
480
481 clk_disable_unprepare(scp->clk);
482 dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
483
484 return 0;
485
486 stop:
487 scp->data->scp_reset_assert(scp);
488 clk_disable_unprepare(scp->clk);
489 return ret;
490 }
491
mt8183_scp_da_to_va(struct mtk_scp * scp,u64 da,size_t len)492 static void *mt8183_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
493 {
494 int offset;
495
496 if (da < scp->sram_size) {
497 offset = da;
498 if (offset >= 0 && (offset + len) <= scp->sram_size)
499 return (void __force *)scp->sram_base + offset;
500 } else if (scp->dram_size) {
501 offset = da - scp->dma_addr;
502 if (offset >= 0 && (offset + len) <= scp->dram_size)
503 return scp->cpu_addr + offset;
504 }
505
506 return NULL;
507 }
508
mt8192_scp_da_to_va(struct mtk_scp * scp,u64 da,size_t len)509 static void *mt8192_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
510 {
511 int offset;
512
513 if (da >= scp->sram_phys &&
514 (da + len) <= scp->sram_phys + scp->sram_size) {
515 offset = da - scp->sram_phys;
516 return (void __force *)scp->sram_base + offset;
517 }
518
519 /* optional memory region */
520 if (scp->l1tcm_size &&
521 da >= scp->l1tcm_phys &&
522 (da + len) <= scp->l1tcm_phys + scp->l1tcm_size) {
523 offset = da - scp->l1tcm_phys;
524 return (void __force *)scp->l1tcm_base + offset;
525 }
526
527 /* optional memory region */
528 if (scp->dram_size &&
529 da >= scp->dma_addr &&
530 (da + len) <= scp->dma_addr + scp->dram_size) {
531 offset = da - scp->dma_addr;
532 return scp->cpu_addr + offset;
533 }
534
535 return NULL;
536 }
537
scp_da_to_va(struct rproc * rproc,u64 da,size_t len,bool * is_iomem)538 static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
539 {
540 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
541
542 return scp->data->scp_da_to_va(scp, da, len);
543 }
544
mt8183_scp_stop(struct mtk_scp * scp)545 static void mt8183_scp_stop(struct mtk_scp *scp)
546 {
547 /* Disable SCP watchdog */
548 writel(0, scp->reg_base + MT8183_WDT_CFG);
549 }
550
mt8192_scp_stop(struct mtk_scp * scp)551 static void mt8192_scp_stop(struct mtk_scp *scp)
552 {
553 /* Disable SRAM clock */
554 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
555 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
556 mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
557 mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
558 mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
559
560 /* Disable SCP watchdog */
561 writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
562 }
563
scp_stop(struct rproc * rproc)564 static int scp_stop(struct rproc *rproc)
565 {
566 struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
567 int ret;
568
569 ret = clk_prepare_enable(scp->clk);
570 if (ret) {
571 dev_err(scp->dev, "failed to enable clocks\n");
572 return ret;
573 }
574
575 scp->data->scp_reset_assert(scp);
576 scp->data->scp_stop(scp);
577 clk_disable_unprepare(scp->clk);
578
579 return 0;
580 }
581
582 static const struct rproc_ops scp_ops = {
583 .start = scp_start,
584 .stop = scp_stop,
585 .load = scp_load,
586 .da_to_va = scp_da_to_va,
587 .parse_fw = scp_parse_fw,
588 };
589
590 /**
591 * scp_get_device() - get device struct of SCP
592 *
593 * @scp: mtk_scp structure
594 **/
scp_get_device(struct mtk_scp * scp)595 struct device *scp_get_device(struct mtk_scp *scp)
596 {
597 return scp->dev;
598 }
599 EXPORT_SYMBOL_GPL(scp_get_device);
600
601 /**
602 * scp_get_rproc() - get rproc struct of SCP
603 *
604 * @scp: mtk_scp structure
605 **/
scp_get_rproc(struct mtk_scp * scp)606 struct rproc *scp_get_rproc(struct mtk_scp *scp)
607 {
608 return scp->rproc;
609 }
610 EXPORT_SYMBOL_GPL(scp_get_rproc);
611
612 /**
613 * scp_get_vdec_hw_capa() - get video decoder hardware capability
614 *
615 * @scp: mtk_scp structure
616 *
617 * Return: video decoder hardware capability
618 **/
scp_get_vdec_hw_capa(struct mtk_scp * scp)619 unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
620 {
621 return scp->run.dec_capability;
622 }
623 EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
624
625 /**
626 * scp_get_venc_hw_capa() - get video encoder hardware capability
627 *
628 * @scp: mtk_scp structure
629 *
630 * Return: video encoder hardware capability
631 **/
scp_get_venc_hw_capa(struct mtk_scp * scp)632 unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
633 {
634 return scp->run.enc_capability;
635 }
636 EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
637
638 /**
639 * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
640 *
641 * @scp: mtk_scp structure
642 * @mem_addr: SCP views memory address
643 *
644 * Mapping the SCP's SRAM address /
645 * DMEM (Data Extended Memory) memory address /
646 * Working buffer memory address to
647 * kernel virtual address.
648 *
649 * Return: Return ERR_PTR(-EINVAL) if mapping failed,
650 * otherwise the mapped kernel virtual address
651 **/
scp_mapping_dm_addr(struct mtk_scp * scp,u32 mem_addr)652 void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
653 {
654 void *ptr;
655
656 ptr = scp_da_to_va(scp->rproc, mem_addr, 0, NULL);
657 if (!ptr)
658 return ERR_PTR(-EINVAL);
659
660 return ptr;
661 }
662 EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
663
scp_map_memory_region(struct mtk_scp * scp)664 static int scp_map_memory_region(struct mtk_scp *scp)
665 {
666 int ret;
667
668 ret = of_reserved_mem_device_init(scp->dev);
669
670 /* reserved memory is optional. */
671 if (ret == -ENODEV) {
672 dev_info(scp->dev, "skipping reserved memory initialization.");
673 return 0;
674 }
675
676 if (ret) {
677 dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
678 return -ENOMEM;
679 }
680
681 /* Reserved SCP code size */
682 scp->dram_size = MAX_CODE_SIZE;
683 scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
684 &scp->dma_addr, GFP_KERNEL);
685 if (!scp->cpu_addr)
686 return -ENOMEM;
687
688 return 0;
689 }
690
scp_unmap_memory_region(struct mtk_scp * scp)691 static void scp_unmap_memory_region(struct mtk_scp *scp)
692 {
693 if (scp->dram_size == 0)
694 return;
695
696 dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
697 scp->dma_addr);
698 of_reserved_mem_device_release(scp->dev);
699 }
700
scp_register_ipi(struct platform_device * pdev,u32 id,ipi_handler_t handler,void * priv)701 static int scp_register_ipi(struct platform_device *pdev, u32 id,
702 ipi_handler_t handler, void *priv)
703 {
704 struct mtk_scp *scp = platform_get_drvdata(pdev);
705
706 return scp_ipi_register(scp, id, handler, priv);
707 }
708
scp_unregister_ipi(struct platform_device * pdev,u32 id)709 static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
710 {
711 struct mtk_scp *scp = platform_get_drvdata(pdev);
712
713 scp_ipi_unregister(scp, id);
714 }
715
scp_send_ipi(struct platform_device * pdev,u32 id,void * buf,unsigned int len,unsigned int wait)716 static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
717 unsigned int len, unsigned int wait)
718 {
719 struct mtk_scp *scp = platform_get_drvdata(pdev);
720
721 return scp_ipi_send(scp, id, buf, len, wait);
722 }
723
724 static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
725 .send_ipi = scp_send_ipi,
726 .register_ipi = scp_register_ipi,
727 .unregister_ipi = scp_unregister_ipi,
728 .ns_ipi_id = SCP_IPI_NS_SERVICE,
729 };
730
scp_add_rpmsg_subdev(struct mtk_scp * scp)731 static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
732 {
733 scp->rpmsg_subdev =
734 mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
735 &mtk_scp_rpmsg_info);
736 if (scp->rpmsg_subdev)
737 rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
738 }
739
scp_remove_rpmsg_subdev(struct mtk_scp * scp)740 static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
741 {
742 if (scp->rpmsg_subdev) {
743 rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
744 mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
745 scp->rpmsg_subdev = NULL;
746 }
747 }
748
scp_probe(struct platform_device * pdev)749 static int scp_probe(struct platform_device *pdev)
750 {
751 struct device *dev = &pdev->dev;
752 struct device_node *np = dev->of_node;
753 struct mtk_scp *scp;
754 struct rproc *rproc;
755 struct resource *res;
756 char *fw_name = "scp.img";
757 int ret, i;
758
759 rproc = rproc_alloc(dev,
760 np->name,
761 &scp_ops,
762 fw_name,
763 sizeof(*scp));
764 if (!rproc) {
765 dev_err(dev, "unable to allocate remoteproc\n");
766 return -ENOMEM;
767 }
768
769 scp = (struct mtk_scp *)rproc->priv;
770 scp->rproc = rproc;
771 scp->dev = dev;
772 scp->data = of_device_get_match_data(dev);
773 platform_set_drvdata(pdev, scp);
774
775 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
776 scp->sram_base = devm_ioremap_resource(dev, res);
777 if (IS_ERR((__force void *)scp->sram_base)) {
778 dev_err(dev, "Failed to parse and map sram memory\n");
779 ret = PTR_ERR((__force void *)scp->sram_base);
780 goto free_rproc;
781 }
782 scp->sram_size = resource_size(res);
783 scp->sram_phys = res->start;
784
785 /* l1tcm is an optional memory region */
786 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
787 scp->l1tcm_base = devm_ioremap_resource(dev, res);
788 if (IS_ERR((__force void *)scp->l1tcm_base)) {
789 ret = PTR_ERR((__force void *)scp->l1tcm_base);
790 if (ret != -EINVAL) {
791 dev_err(dev, "Failed to map l1tcm memory\n");
792 goto free_rproc;
793 }
794 } else {
795 scp->l1tcm_size = resource_size(res);
796 scp->l1tcm_phys = res->start;
797 }
798
799 mutex_init(&scp->send_lock);
800 for (i = 0; i < SCP_IPI_MAX; i++)
801 mutex_init(&scp->ipi_desc[i].lock);
802
803 scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
804 if (IS_ERR((__force void *)scp->reg_base)) {
805 dev_err(dev, "Failed to parse and map cfg memory\n");
806 ret = PTR_ERR((__force void *)scp->reg_base);
807 goto destroy_mutex;
808 }
809
810 ret = scp_map_memory_region(scp);
811 if (ret)
812 goto destroy_mutex;
813
814 ret = scp->data->scp_clk_get(scp);
815 if (ret)
816 goto release_dev_mem;
817
818 /* register SCP initialization IPI */
819 ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
820 if (ret) {
821 dev_err(dev, "Failed to register IPI_SCP_INIT\n");
822 goto release_dev_mem;
823 }
824
825 init_waitqueue_head(&scp->run.wq);
826 init_waitqueue_head(&scp->ack_wq);
827
828 scp_add_rpmsg_subdev(scp);
829
830 ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
831 scp_irq_handler, IRQF_ONESHOT,
832 pdev->name, scp);
833
834 if (ret) {
835 dev_err(dev, "failed to request irq\n");
836 goto remove_subdev;
837 }
838
839 ret = rproc_add(rproc);
840 if (ret)
841 goto remove_subdev;
842
843 return 0;
844
845 remove_subdev:
846 scp_remove_rpmsg_subdev(scp);
847 scp_ipi_unregister(scp, SCP_IPI_INIT);
848 release_dev_mem:
849 scp_unmap_memory_region(scp);
850 destroy_mutex:
851 for (i = 0; i < SCP_IPI_MAX; i++)
852 mutex_destroy(&scp->ipi_desc[i].lock);
853 mutex_destroy(&scp->send_lock);
854 free_rproc:
855 rproc_free(rproc);
856
857 return ret;
858 }
859
scp_remove(struct platform_device * pdev)860 static int scp_remove(struct platform_device *pdev)
861 {
862 struct mtk_scp *scp = platform_get_drvdata(pdev);
863 int i;
864
865 rproc_del(scp->rproc);
866 scp_remove_rpmsg_subdev(scp);
867 scp_ipi_unregister(scp, SCP_IPI_INIT);
868 scp_unmap_memory_region(scp);
869 for (i = 0; i < SCP_IPI_MAX; i++)
870 mutex_destroy(&scp->ipi_desc[i].lock);
871 mutex_destroy(&scp->send_lock);
872 rproc_free(scp->rproc);
873
874 return 0;
875 }
876
877 static const struct mtk_scp_of_data mt8183_of_data = {
878 .scp_clk_get = mt8183_scp_clk_get,
879 .scp_before_load = mt8183_scp_before_load,
880 .scp_irq_handler = mt8183_scp_irq_handler,
881 .scp_reset_assert = mt8183_scp_reset_assert,
882 .scp_reset_deassert = mt8183_scp_reset_deassert,
883 .scp_stop = mt8183_scp_stop,
884 .scp_da_to_va = mt8183_scp_da_to_va,
885 .host_to_scp_reg = MT8183_HOST_TO_SCP,
886 .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
887 .ipi_buf_offset = 0x7bdb0,
888 };
889
890 static const struct mtk_scp_of_data mt8192_of_data = {
891 .scp_clk_get = mt8192_scp_clk_get,
892 .scp_before_load = mt8192_scp_before_load,
893 .scp_irq_handler = mt8192_scp_irq_handler,
894 .scp_reset_assert = mt8192_scp_reset_assert,
895 .scp_reset_deassert = mt8192_scp_reset_deassert,
896 .scp_stop = mt8192_scp_stop,
897 .scp_da_to_va = mt8192_scp_da_to_va,
898 .host_to_scp_reg = MT8192_GIPC_IN_SET,
899 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
900 };
901
902 static const struct mtk_scp_of_data mt8195_of_data = {
903 .scp_clk_get = mt8195_scp_clk_get,
904 .scp_before_load = mt8192_scp_before_load,
905 .scp_irq_handler = mt8192_scp_irq_handler,
906 .scp_reset_assert = mt8192_scp_reset_assert,
907 .scp_reset_deassert = mt8192_scp_reset_deassert,
908 .scp_stop = mt8192_scp_stop,
909 .scp_da_to_va = mt8192_scp_da_to_va,
910 .host_to_scp_reg = MT8192_GIPC_IN_SET,
911 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
912 };
913
914 static const struct of_device_id mtk_scp_of_match[] = {
915 { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
916 { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
917 { .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data },
918 {},
919 };
920 MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
921
922 static struct platform_driver mtk_scp_driver = {
923 .probe = scp_probe,
924 .remove = scp_remove,
925 .driver = {
926 .name = "mtk-scp",
927 .of_match_table = mtk_scp_of_match,
928 },
929 };
930
931 module_platform_driver(mtk_scp_driver);
932
933 MODULE_LICENSE("GPL v2");
934 MODULE_DESCRIPTION("MediaTek SCP control driver");
935