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 = priv;
78 struct scp_run *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
scp_sram_power_on(void __iomem * addr,u32 reserved_mask)368 static void scp_sram_power_on(void __iomem *addr, u32 reserved_mask)
369 {
370 int i;
371
372 for (i = 31; i >= 0; i--)
373 writel(GENMASK(i, 0) & ~reserved_mask, addr);
374 writel(0, addr);
375 }
376
scp_sram_power_off(void __iomem * addr,u32 reserved_mask)377 static void scp_sram_power_off(void __iomem *addr, u32 reserved_mask)
378 {
379 int i;
380
381 writel(0, addr);
382 for (i = 0; i < 32; i++)
383 writel(GENMASK(i, 0) & ~reserved_mask, addr);
384 }
385
mt8186_scp_before_load(struct mtk_scp * scp)386 static int mt8186_scp_before_load(struct mtk_scp *scp)
387 {
388 /* Clear SCP to host interrupt */
389 writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
390
391 /* Reset clocks before loading FW */
392 writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
393 writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
394
395 /* Turn on the power of SCP's SRAM before using it. Enable 1 block per time*/
396 scp_sram_power_on(scp->reg_base + MT8183_SCP_SRAM_PDN, 0);
397
398 /* Initialize TCM before loading FW. */
399 writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
400 writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
401 writel(0x0, scp->reg_base + MT8186_SCP_L1_SRAM_PD_P1);
402 writel(0x0, scp->reg_base + MT8186_SCP_L1_SRAM_PD_p2);
403
404 /*
405 * Set I-cache and D-cache size before loading SCP FW.
406 * SCP SRAM logical address may change when cache size setting differs.
407 */
408 writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
409 scp->reg_base + MT8183_SCP_CACHE_CON);
410 writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
411
412 return 0;
413 }
414
mt8192_scp_before_load(struct mtk_scp * scp)415 static int mt8192_scp_before_load(struct mtk_scp *scp)
416 {
417 /* clear SPM interrupt, SCP2SPM_IPC_CLR */
418 writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
419
420 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
421
422 /* enable SRAM clock */
423 scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
424 scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
425 scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
426 scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
427 scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
428
429 /* enable MPU for all memory regions */
430 writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
431
432 return 0;
433 }
434
mt8195_scp_before_load(struct mtk_scp * scp)435 static int mt8195_scp_before_load(struct mtk_scp *scp)
436 {
437 /* clear SPM interrupt, SCP2SPM_IPC_CLR */
438 writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
439
440 writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
441
442 /* enable SRAM clock */
443 scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
444 scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
445 scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
446 scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
447 MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
448 scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
449
450 /* enable MPU for all memory regions */
451 writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
452
453 return 0;
454 }
455
scp_load(struct rproc * rproc,const struct firmware * fw)456 static int scp_load(struct rproc *rproc, const struct firmware *fw)
457 {
458 struct mtk_scp *scp = rproc->priv;
459 struct device *dev = scp->dev;
460 int ret;
461
462 ret = clk_prepare_enable(scp->clk);
463 if (ret) {
464 dev_err(dev, "failed to enable clocks\n");
465 return ret;
466 }
467
468 /* Hold SCP in reset while loading FW. */
469 scp->data->scp_reset_assert(scp);
470
471 ret = scp->data->scp_before_load(scp);
472 if (ret < 0)
473 goto leave;
474
475 ret = scp_elf_load_segments(rproc, fw);
476 leave:
477 clk_disable_unprepare(scp->clk);
478
479 return ret;
480 }
481
scp_parse_fw(struct rproc * rproc,const struct firmware * fw)482 static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw)
483 {
484 struct mtk_scp *scp = rproc->priv;
485 struct device *dev = scp->dev;
486 int ret;
487
488 ret = clk_prepare_enable(scp->clk);
489 if (ret) {
490 dev_err(dev, "failed to enable clocks\n");
491 return ret;
492 }
493
494 ret = scp_ipi_init(scp, fw);
495 clk_disable_unprepare(scp->clk);
496 return ret;
497 }
498
scp_start(struct rproc * rproc)499 static int scp_start(struct rproc *rproc)
500 {
501 struct mtk_scp *scp = rproc->priv;
502 struct device *dev = scp->dev;
503 struct scp_run *run = &scp->run;
504 int ret;
505
506 ret = clk_prepare_enable(scp->clk);
507 if (ret) {
508 dev_err(dev, "failed to enable clocks\n");
509 return ret;
510 }
511
512 run->signaled = false;
513
514 scp->data->scp_reset_deassert(scp);
515
516 ret = wait_event_interruptible_timeout(
517 run->wq,
518 run->signaled,
519 msecs_to_jiffies(2000));
520
521 if (ret == 0) {
522 dev_err(dev, "wait SCP initialization timeout!\n");
523 ret = -ETIME;
524 goto stop;
525 }
526 if (ret == -ERESTARTSYS) {
527 dev_err(dev, "wait SCP interrupted by a signal!\n");
528 goto stop;
529 }
530
531 clk_disable_unprepare(scp->clk);
532 dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
533
534 return 0;
535
536 stop:
537 scp->data->scp_reset_assert(scp);
538 clk_disable_unprepare(scp->clk);
539 return ret;
540 }
541
mt8183_scp_da_to_va(struct mtk_scp * scp,u64 da,size_t len)542 static void *mt8183_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
543 {
544 int offset;
545
546 if (da < scp->sram_size) {
547 offset = da;
548 if (offset >= 0 && (offset + len) <= scp->sram_size)
549 return (void __force *)scp->sram_base + offset;
550 } else if (scp->dram_size) {
551 offset = da - scp->dma_addr;
552 if (offset >= 0 && (offset + len) <= scp->dram_size)
553 return scp->cpu_addr + offset;
554 }
555
556 return NULL;
557 }
558
mt8192_scp_da_to_va(struct mtk_scp * scp,u64 da,size_t len)559 static void *mt8192_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
560 {
561 int offset;
562
563 if (da >= scp->sram_phys &&
564 (da + len) <= scp->sram_phys + scp->sram_size) {
565 offset = da - scp->sram_phys;
566 return (void __force *)scp->sram_base + offset;
567 }
568
569 /* optional memory region */
570 if (scp->l1tcm_size &&
571 da >= scp->l1tcm_phys &&
572 (da + len) <= scp->l1tcm_phys + scp->l1tcm_size) {
573 offset = da - scp->l1tcm_phys;
574 return (void __force *)scp->l1tcm_base + offset;
575 }
576
577 /* optional memory region */
578 if (scp->dram_size &&
579 da >= scp->dma_addr &&
580 (da + len) <= scp->dma_addr + scp->dram_size) {
581 offset = da - scp->dma_addr;
582 return scp->cpu_addr + offset;
583 }
584
585 return NULL;
586 }
587
scp_da_to_va(struct rproc * rproc,u64 da,size_t len,bool * is_iomem)588 static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
589 {
590 struct mtk_scp *scp = rproc->priv;
591
592 return scp->data->scp_da_to_va(scp, da, len);
593 }
594
mt8183_scp_stop(struct mtk_scp * scp)595 static void mt8183_scp_stop(struct mtk_scp *scp)
596 {
597 /* Disable SCP watchdog */
598 writel(0, scp->reg_base + MT8183_WDT_CFG);
599 }
600
mt8192_scp_stop(struct mtk_scp * scp)601 static void mt8192_scp_stop(struct mtk_scp *scp)
602 {
603 /* Disable SRAM clock */
604 scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
605 scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
606 scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
607 scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
608 scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
609
610 /* Disable SCP watchdog */
611 writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
612 }
613
mt8195_scp_stop(struct mtk_scp * scp)614 static void mt8195_scp_stop(struct mtk_scp *scp)
615 {
616 /* Disable SRAM clock */
617 scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
618 scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
619 scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
620 scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
621 MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
622 scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
623
624 /* Disable SCP watchdog */
625 writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
626 }
627
scp_stop(struct rproc * rproc)628 static int scp_stop(struct rproc *rproc)
629 {
630 struct mtk_scp *scp = rproc->priv;
631 int ret;
632
633 ret = clk_prepare_enable(scp->clk);
634 if (ret) {
635 dev_err(scp->dev, "failed to enable clocks\n");
636 return ret;
637 }
638
639 scp->data->scp_reset_assert(scp);
640 scp->data->scp_stop(scp);
641 clk_disable_unprepare(scp->clk);
642
643 return 0;
644 }
645
646 static const struct rproc_ops scp_ops = {
647 .start = scp_start,
648 .stop = scp_stop,
649 .load = scp_load,
650 .da_to_va = scp_da_to_va,
651 .parse_fw = scp_parse_fw,
652 .sanity_check = rproc_elf_sanity_check,
653 };
654
655 /**
656 * scp_get_device() - get device struct of SCP
657 *
658 * @scp: mtk_scp structure
659 **/
scp_get_device(struct mtk_scp * scp)660 struct device *scp_get_device(struct mtk_scp *scp)
661 {
662 return scp->dev;
663 }
664 EXPORT_SYMBOL_GPL(scp_get_device);
665
666 /**
667 * scp_get_rproc() - get rproc struct of SCP
668 *
669 * @scp: mtk_scp structure
670 **/
scp_get_rproc(struct mtk_scp * scp)671 struct rproc *scp_get_rproc(struct mtk_scp *scp)
672 {
673 return scp->rproc;
674 }
675 EXPORT_SYMBOL_GPL(scp_get_rproc);
676
677 /**
678 * scp_get_vdec_hw_capa() - get video decoder hardware capability
679 *
680 * @scp: mtk_scp structure
681 *
682 * Return: video decoder hardware capability
683 **/
scp_get_vdec_hw_capa(struct mtk_scp * scp)684 unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
685 {
686 return scp->run.dec_capability;
687 }
688 EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
689
690 /**
691 * scp_get_venc_hw_capa() - get video encoder hardware capability
692 *
693 * @scp: mtk_scp structure
694 *
695 * Return: video encoder hardware capability
696 **/
scp_get_venc_hw_capa(struct mtk_scp * scp)697 unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
698 {
699 return scp->run.enc_capability;
700 }
701 EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
702
703 /**
704 * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
705 *
706 * @scp: mtk_scp structure
707 * @mem_addr: SCP views memory address
708 *
709 * Mapping the SCP's SRAM address /
710 * DMEM (Data Extended Memory) memory address /
711 * Working buffer memory address to
712 * kernel virtual address.
713 *
714 * Return: Return ERR_PTR(-EINVAL) if mapping failed,
715 * otherwise the mapped kernel virtual address
716 **/
scp_mapping_dm_addr(struct mtk_scp * scp,u32 mem_addr)717 void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
718 {
719 void *ptr;
720
721 ptr = scp_da_to_va(scp->rproc, mem_addr, 0, NULL);
722 if (!ptr)
723 return ERR_PTR(-EINVAL);
724
725 return ptr;
726 }
727 EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
728
scp_map_memory_region(struct mtk_scp * scp)729 static int scp_map_memory_region(struct mtk_scp *scp)
730 {
731 int ret;
732
733 ret = of_reserved_mem_device_init(scp->dev);
734
735 /* reserved memory is optional. */
736 if (ret == -ENODEV) {
737 dev_info(scp->dev, "skipping reserved memory initialization.");
738 return 0;
739 }
740
741 if (ret) {
742 dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
743 return -ENOMEM;
744 }
745
746 /* Reserved SCP code size */
747 scp->dram_size = MAX_CODE_SIZE;
748 scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
749 &scp->dma_addr, GFP_KERNEL);
750 if (!scp->cpu_addr)
751 return -ENOMEM;
752
753 return 0;
754 }
755
scp_unmap_memory_region(struct mtk_scp * scp)756 static void scp_unmap_memory_region(struct mtk_scp *scp)
757 {
758 if (scp->dram_size == 0)
759 return;
760
761 dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
762 scp->dma_addr);
763 of_reserved_mem_device_release(scp->dev);
764 }
765
scp_register_ipi(struct platform_device * pdev,u32 id,ipi_handler_t handler,void * priv)766 static int scp_register_ipi(struct platform_device *pdev, u32 id,
767 ipi_handler_t handler, void *priv)
768 {
769 struct mtk_scp *scp = platform_get_drvdata(pdev);
770
771 return scp_ipi_register(scp, id, handler, priv);
772 }
773
scp_unregister_ipi(struct platform_device * pdev,u32 id)774 static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
775 {
776 struct mtk_scp *scp = platform_get_drvdata(pdev);
777
778 scp_ipi_unregister(scp, id);
779 }
780
scp_send_ipi(struct platform_device * pdev,u32 id,void * buf,unsigned int len,unsigned int wait)781 static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
782 unsigned int len, unsigned int wait)
783 {
784 struct mtk_scp *scp = platform_get_drvdata(pdev);
785
786 return scp_ipi_send(scp, id, buf, len, wait);
787 }
788
789 static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
790 .send_ipi = scp_send_ipi,
791 .register_ipi = scp_register_ipi,
792 .unregister_ipi = scp_unregister_ipi,
793 .ns_ipi_id = SCP_IPI_NS_SERVICE,
794 };
795
scp_add_rpmsg_subdev(struct mtk_scp * scp)796 static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
797 {
798 scp->rpmsg_subdev =
799 mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
800 &mtk_scp_rpmsg_info);
801 if (scp->rpmsg_subdev)
802 rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
803 }
804
scp_remove_rpmsg_subdev(struct mtk_scp * scp)805 static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
806 {
807 if (scp->rpmsg_subdev) {
808 rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
809 mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
810 scp->rpmsg_subdev = NULL;
811 }
812 }
813
scp_probe(struct platform_device * pdev)814 static int scp_probe(struct platform_device *pdev)
815 {
816 struct device *dev = &pdev->dev;
817 struct device_node *np = dev->of_node;
818 struct mtk_scp *scp;
819 struct rproc *rproc;
820 struct resource *res;
821 const char *fw_name = "scp.img";
822 int ret, i;
823
824 ret = rproc_of_parse_firmware(dev, 0, &fw_name);
825 if (ret < 0 && ret != -EINVAL)
826 return ret;
827
828 rproc = devm_rproc_alloc(dev, np->name, &scp_ops, fw_name, sizeof(*scp));
829 if (!rproc)
830 return dev_err_probe(dev, -ENOMEM, "unable to allocate remoteproc\n");
831
832 scp = rproc->priv;
833 scp->rproc = rproc;
834 scp->dev = dev;
835 scp->data = of_device_get_match_data(dev);
836 platform_set_drvdata(pdev, scp);
837
838 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
839 scp->sram_base = devm_ioremap_resource(dev, res);
840 if (IS_ERR(scp->sram_base))
841 return dev_err_probe(dev, PTR_ERR(scp->sram_base),
842 "Failed to parse and map sram memory\n");
843
844 scp->sram_size = resource_size(res);
845 scp->sram_phys = res->start;
846
847 /* l1tcm is an optional memory region */
848 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
849 scp->l1tcm_base = devm_ioremap_resource(dev, res);
850 if (IS_ERR(scp->l1tcm_base)) {
851 ret = PTR_ERR(scp->l1tcm_base);
852 if (ret != -EINVAL) {
853 return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
854 }
855 } else {
856 scp->l1tcm_size = resource_size(res);
857 scp->l1tcm_phys = res->start;
858 }
859
860 scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
861 if (IS_ERR(scp->reg_base))
862 return dev_err_probe(dev, PTR_ERR(scp->reg_base),
863 "Failed to parse and map cfg memory\n");
864
865 ret = scp->data->scp_clk_get(scp);
866 if (ret)
867 return ret;
868
869 ret = scp_map_memory_region(scp);
870 if (ret)
871 return ret;
872
873 mutex_init(&scp->send_lock);
874 for (i = 0; i < SCP_IPI_MAX; i++)
875 mutex_init(&scp->ipi_desc[i].lock);
876
877 /* register SCP initialization IPI */
878 ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
879 if (ret) {
880 dev_err(dev, "Failed to register IPI_SCP_INIT\n");
881 goto release_dev_mem;
882 }
883
884 init_waitqueue_head(&scp->run.wq);
885 init_waitqueue_head(&scp->ack_wq);
886
887 scp_add_rpmsg_subdev(scp);
888
889 ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
890 scp_irq_handler, IRQF_ONESHOT,
891 pdev->name, scp);
892
893 if (ret) {
894 dev_err(dev, "failed to request irq\n");
895 goto remove_subdev;
896 }
897
898 ret = rproc_add(rproc);
899 if (ret)
900 goto remove_subdev;
901
902 return 0;
903
904 remove_subdev:
905 scp_remove_rpmsg_subdev(scp);
906 scp_ipi_unregister(scp, SCP_IPI_INIT);
907 release_dev_mem:
908 scp_unmap_memory_region(scp);
909 for (i = 0; i < SCP_IPI_MAX; i++)
910 mutex_destroy(&scp->ipi_desc[i].lock);
911 mutex_destroy(&scp->send_lock);
912
913 return ret;
914 }
915
scp_remove(struct platform_device * pdev)916 static void scp_remove(struct platform_device *pdev)
917 {
918 struct mtk_scp *scp = platform_get_drvdata(pdev);
919 int i;
920
921 rproc_del(scp->rproc);
922 scp_remove_rpmsg_subdev(scp);
923 scp_ipi_unregister(scp, SCP_IPI_INIT);
924 scp_unmap_memory_region(scp);
925 for (i = 0; i < SCP_IPI_MAX; i++)
926 mutex_destroy(&scp->ipi_desc[i].lock);
927 mutex_destroy(&scp->send_lock);
928 }
929
930 static const struct mtk_scp_of_data mt8183_of_data = {
931 .scp_clk_get = mt8183_scp_clk_get,
932 .scp_before_load = mt8183_scp_before_load,
933 .scp_irq_handler = mt8183_scp_irq_handler,
934 .scp_reset_assert = mt8183_scp_reset_assert,
935 .scp_reset_deassert = mt8183_scp_reset_deassert,
936 .scp_stop = mt8183_scp_stop,
937 .scp_da_to_va = mt8183_scp_da_to_va,
938 .host_to_scp_reg = MT8183_HOST_TO_SCP,
939 .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
940 .ipi_buf_offset = 0x7bdb0,
941 };
942
943 static const struct mtk_scp_of_data mt8186_of_data = {
944 .scp_clk_get = mt8195_scp_clk_get,
945 .scp_before_load = mt8186_scp_before_load,
946 .scp_irq_handler = mt8183_scp_irq_handler,
947 .scp_reset_assert = mt8183_scp_reset_assert,
948 .scp_reset_deassert = mt8183_scp_reset_deassert,
949 .scp_stop = mt8183_scp_stop,
950 .scp_da_to_va = mt8183_scp_da_to_va,
951 .host_to_scp_reg = MT8183_HOST_TO_SCP,
952 .host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
953 .ipi_buf_offset = 0x3bdb0,
954 };
955
956 static const struct mtk_scp_of_data mt8188_of_data = {
957 .scp_clk_get = mt8195_scp_clk_get,
958 .scp_before_load = mt8192_scp_before_load,
959 .scp_irq_handler = mt8192_scp_irq_handler,
960 .scp_reset_assert = mt8192_scp_reset_assert,
961 .scp_reset_deassert = mt8192_scp_reset_deassert,
962 .scp_stop = mt8192_scp_stop,
963 .scp_da_to_va = mt8192_scp_da_to_va,
964 .host_to_scp_reg = MT8192_GIPC_IN_SET,
965 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
966 };
967
968 static const struct mtk_scp_of_data mt8192_of_data = {
969 .scp_clk_get = mt8192_scp_clk_get,
970 .scp_before_load = mt8192_scp_before_load,
971 .scp_irq_handler = mt8192_scp_irq_handler,
972 .scp_reset_assert = mt8192_scp_reset_assert,
973 .scp_reset_deassert = mt8192_scp_reset_deassert,
974 .scp_stop = mt8192_scp_stop,
975 .scp_da_to_va = mt8192_scp_da_to_va,
976 .host_to_scp_reg = MT8192_GIPC_IN_SET,
977 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
978 };
979
980 static const struct mtk_scp_of_data mt8195_of_data = {
981 .scp_clk_get = mt8195_scp_clk_get,
982 .scp_before_load = mt8195_scp_before_load,
983 .scp_irq_handler = mt8192_scp_irq_handler,
984 .scp_reset_assert = mt8192_scp_reset_assert,
985 .scp_reset_deassert = mt8192_scp_reset_deassert,
986 .scp_stop = mt8195_scp_stop,
987 .scp_da_to_va = mt8192_scp_da_to_va,
988 .host_to_scp_reg = MT8192_GIPC_IN_SET,
989 .host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
990 };
991
992 static const struct of_device_id mtk_scp_of_match[] = {
993 { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
994 { .compatible = "mediatek,mt8186-scp", .data = &mt8186_of_data },
995 { .compatible = "mediatek,mt8188-scp", .data = &mt8188_of_data },
996 { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
997 { .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data },
998 {},
999 };
1000 MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
1001
1002 static struct platform_driver mtk_scp_driver = {
1003 .probe = scp_probe,
1004 .remove_new = scp_remove,
1005 .driver = {
1006 .name = "mtk-scp",
1007 .of_match_table = mtk_scp_of_match,
1008 },
1009 };
1010
1011 module_platform_driver(mtk_scp_driver);
1012
1013 MODULE_LICENSE("GPL v2");
1014 MODULE_DESCRIPTION("MediaTek SCP control driver");
1015
