GNU Linux-libre 4.19.286-gnu1
[releases.git] / drivers / remoteproc / qcom_q6v5_wcss.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2016-2018 Linaro Ltd.
4  * Copyright (C) 2014 Sony Mobile Communications AB
5  * Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
6  */
7 #include <linux/iopoll.h>
8 #include <linux/kernel.h>
9 #include <linux/mfd/syscon.h>
10 #include <linux/module.h>
11 #include <linux/of_reserved_mem.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <linux/reset.h>
15 #include <linux/soc/qcom/mdt_loader.h>
16 #include "qcom_common.h"
17 #include "qcom_q6v5.h"
18
19 #define WCSS_CRASH_REASON               421
20
21 /* Q6SS Register Offsets */
22 #define Q6SS_RESET_REG          0x014
23 #define Q6SS_GFMUX_CTL_REG              0x020
24 #define Q6SS_PWR_CTL_REG                0x030
25 #define Q6SS_MEM_PWR_CTL                0x0B0
26
27 /* AXI Halt Register Offsets */
28 #define AXI_HALTREQ_REG                 0x0
29 #define AXI_HALTACK_REG                 0x4
30 #define AXI_IDLE_REG                    0x8
31
32 #define HALT_ACK_TIMEOUT_MS             100
33
34 /* Q6SS_RESET */
35 #define Q6SS_STOP_CORE                  BIT(0)
36 #define Q6SS_CORE_ARES                  BIT(1)
37 #define Q6SS_BUS_ARES_ENABLE            BIT(2)
38
39 /* Q6SS_GFMUX_CTL */
40 #define Q6SS_CLK_ENABLE                 BIT(1)
41
42 /* Q6SS_PWR_CTL */
43 #define Q6SS_L2DATA_STBY_N              BIT(18)
44 #define Q6SS_SLP_RET_N                  BIT(19)
45 #define Q6SS_CLAMP_IO                   BIT(20)
46 #define QDSS_BHS_ON                     BIT(21)
47
48 /* Q6SS parameters */
49 #define Q6SS_LDO_BYP            BIT(25)
50 #define Q6SS_BHS_ON             BIT(24)
51 #define Q6SS_CLAMP_WL           BIT(21)
52 #define Q6SS_CLAMP_QMC_MEM              BIT(22)
53 #define HALT_CHECK_MAX_LOOPS            200
54 #define Q6SS_XO_CBCR            GENMASK(5, 3)
55
56 /* Q6SS config/status registers */
57 #define TCSR_GLOBAL_CFG0        0x0
58 #define TCSR_GLOBAL_CFG1        0x4
59 #define SSCAON_CONFIG           0x8
60 #define SSCAON_STATUS           0xc
61 #define Q6SS_BHS_STATUS         0x78
62 #define Q6SS_RST_EVB            0x10
63
64 #define BHS_EN_REST_ACK         BIT(0)
65 #define SSCAON_ENABLE           BIT(13)
66 #define SSCAON_BUS_EN           BIT(15)
67 #define SSCAON_BUS_MUX_MASK     GENMASK(18, 16)
68
69 #define MEM_BANKS               19
70 #define TCSR_WCSS_CLK_MASK      0x1F
71 #define TCSR_WCSS_CLK_ENABLE    0x14
72
73 struct q6v5_wcss {
74         struct device *dev;
75
76         void __iomem *reg_base;
77         void __iomem *rmb_base;
78
79         struct regmap *halt_map;
80         u32 halt_q6;
81         u32 halt_wcss;
82         u32 halt_nc;
83
84         struct reset_control *wcss_aon_reset;
85         struct reset_control *wcss_reset;
86         struct reset_control *wcss_q6_reset;
87
88         struct qcom_q6v5 q6v5;
89
90         phys_addr_t mem_phys;
91         phys_addr_t mem_reloc;
92         void *mem_region;
93         size_t mem_size;
94 };
95
96 static int q6v5_wcss_reset(struct q6v5_wcss *wcss)
97 {
98         int ret;
99         u32 val;
100         int i;
101
102         /* Assert resets, stop core */
103         val = readl(wcss->reg_base + Q6SS_RESET_REG);
104         val |= Q6SS_CORE_ARES | Q6SS_BUS_ARES_ENABLE | Q6SS_STOP_CORE;
105         writel(val, wcss->reg_base + Q6SS_RESET_REG);
106
107         /* BHS require xo cbcr to be enabled */
108         val = readl(wcss->reg_base + Q6SS_XO_CBCR);
109         val |= 0x1;
110         writel(val, wcss->reg_base + Q6SS_XO_CBCR);
111
112         /* Read CLKOFF bit to go low indicating CLK is enabled */
113         ret = readl_poll_timeout(wcss->reg_base + Q6SS_XO_CBCR,
114                                  val, !(val & BIT(31)), 1,
115                                  HALT_CHECK_MAX_LOOPS);
116         if (ret) {
117                 dev_err(wcss->dev,
118                         "xo cbcr enabling timed out (rc:%d)\n", ret);
119                 return ret;
120         }
121         /* Enable power block headswitch and wait for it to stabilize */
122         val = readl(wcss->reg_base + Q6SS_PWR_CTL_REG);
123         val |= Q6SS_BHS_ON;
124         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
125         udelay(1);
126
127         /* Put LDO in bypass mode */
128         val |= Q6SS_LDO_BYP;
129         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
130
131         /* Deassert Q6 compiler memory clamp */
132         val = readl(wcss->reg_base + Q6SS_PWR_CTL_REG);
133         val &= ~Q6SS_CLAMP_QMC_MEM;
134         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
135
136         /* Deassert memory peripheral sleep and L2 memory standby */
137         val |= Q6SS_L2DATA_STBY_N | Q6SS_SLP_RET_N;
138         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
139
140         /* Turn on L1, L2, ETB and JU memories 1 at a time */
141         val = readl(wcss->reg_base + Q6SS_MEM_PWR_CTL);
142         for (i = MEM_BANKS; i >= 0; i--) {
143                 val |= BIT(i);
144                 writel(val, wcss->reg_base + Q6SS_MEM_PWR_CTL);
145                 /*
146                  * Read back value to ensure the write is done then
147                  * wait for 1us for both memory peripheral and data
148                  * array to turn on.
149                  */
150                 val |= readl(wcss->reg_base + Q6SS_MEM_PWR_CTL);
151                 udelay(1);
152         }
153         /* Remove word line clamp */
154         val = readl(wcss->reg_base + Q6SS_PWR_CTL_REG);
155         val &= ~Q6SS_CLAMP_WL;
156         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
157
158         /* Remove IO clamp */
159         val &= ~Q6SS_CLAMP_IO;
160         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
161
162         /* Bring core out of reset */
163         val = readl(wcss->reg_base + Q6SS_RESET_REG);
164         val &= ~Q6SS_CORE_ARES;
165         writel(val, wcss->reg_base + Q6SS_RESET_REG);
166
167         /* Turn on core clock */
168         val = readl(wcss->reg_base + Q6SS_GFMUX_CTL_REG);
169         val |= Q6SS_CLK_ENABLE;
170         writel(val, wcss->reg_base + Q6SS_GFMUX_CTL_REG);
171
172         /* Start core execution */
173         val = readl(wcss->reg_base + Q6SS_RESET_REG);
174         val &= ~Q6SS_STOP_CORE;
175         writel(val, wcss->reg_base + Q6SS_RESET_REG);
176
177         return 0;
178 }
179
180 static int q6v5_wcss_start(struct rproc *rproc)
181 {
182         struct q6v5_wcss *wcss = rproc->priv;
183         int ret;
184
185         qcom_q6v5_prepare(&wcss->q6v5);
186
187         /* Release Q6 and WCSS reset */
188         ret = reset_control_deassert(wcss->wcss_reset);
189         if (ret) {
190                 dev_err(wcss->dev, "wcss_reset failed\n");
191                 return ret;
192         }
193
194         ret = reset_control_deassert(wcss->wcss_q6_reset);
195         if (ret) {
196                 dev_err(wcss->dev, "wcss_q6_reset failed\n");
197                 goto wcss_reset;
198         }
199
200         /* Lithium configuration - clock gating and bus arbitration */
201         ret = regmap_update_bits(wcss->halt_map,
202                                  wcss->halt_nc + TCSR_GLOBAL_CFG0,
203                                  TCSR_WCSS_CLK_MASK,
204                                  TCSR_WCSS_CLK_ENABLE);
205         if (ret)
206                 goto wcss_q6_reset;
207
208         ret = regmap_update_bits(wcss->halt_map,
209                                  wcss->halt_nc + TCSR_GLOBAL_CFG1,
210                                  1, 0);
211         if (ret)
212                 goto wcss_q6_reset;
213
214         /* Write bootaddr to EVB so that Q6WCSS will jump there after reset */
215         writel(rproc->bootaddr >> 4, wcss->reg_base + Q6SS_RST_EVB);
216
217         ret = q6v5_wcss_reset(wcss);
218         if (ret)
219                 goto wcss_q6_reset;
220
221         ret = qcom_q6v5_wait_for_start(&wcss->q6v5, 5 * HZ);
222         if (ret == -ETIMEDOUT)
223                 dev_err(wcss->dev, "start timed out\n");
224
225         return ret;
226
227 wcss_q6_reset:
228         reset_control_assert(wcss->wcss_q6_reset);
229
230 wcss_reset:
231         reset_control_assert(wcss->wcss_reset);
232
233         return ret;
234 }
235
236 static void q6v5_wcss_halt_axi_port(struct q6v5_wcss *wcss,
237                                     struct regmap *halt_map,
238                                     u32 offset)
239 {
240         unsigned long timeout;
241         unsigned int val;
242         int ret;
243
244         /* Check if we're already idle */
245         ret = regmap_read(halt_map, offset + AXI_IDLE_REG, &val);
246         if (!ret && val)
247                 return;
248
249         /* Assert halt request */
250         regmap_write(halt_map, offset + AXI_HALTREQ_REG, 1);
251
252         /* Wait for halt */
253         timeout = jiffies + msecs_to_jiffies(HALT_ACK_TIMEOUT_MS);
254         for (;;) {
255                 ret = regmap_read(halt_map, offset + AXI_HALTACK_REG, &val);
256                 if (ret || val || time_after(jiffies, timeout))
257                         break;
258
259                 msleep(1);
260         }
261
262         ret = regmap_read(halt_map, offset + AXI_IDLE_REG, &val);
263         if (ret || !val)
264                 dev_err(wcss->dev, "port failed halt\n");
265
266         /* Clear halt request (port will remain halted until reset) */
267         regmap_write(halt_map, offset + AXI_HALTREQ_REG, 0);
268 }
269
270 static int q6v5_wcss_powerdown(struct q6v5_wcss *wcss)
271 {
272         int ret;
273         u32 val;
274
275         /* 1 - Assert WCSS/Q6 HALTREQ */
276         q6v5_wcss_halt_axi_port(wcss, wcss->halt_map, wcss->halt_wcss);
277
278         /* 2 - Enable WCSSAON_CONFIG */
279         val = readl(wcss->rmb_base + SSCAON_CONFIG);
280         val |= SSCAON_ENABLE;
281         writel(val, wcss->rmb_base + SSCAON_CONFIG);
282
283         /* 3 - Set SSCAON_CONFIG */
284         val |= SSCAON_BUS_EN;
285         val &= ~SSCAON_BUS_MUX_MASK;
286         writel(val, wcss->rmb_base + SSCAON_CONFIG);
287
288         /* 4 - SSCAON_CONFIG 1 */
289         val |= BIT(1);
290         writel(val, wcss->rmb_base + SSCAON_CONFIG);
291
292         /* 5 - wait for SSCAON_STATUS */
293         ret = readl_poll_timeout(wcss->rmb_base + SSCAON_STATUS,
294                                  val, (val & 0xffff) == 0x400, 1000,
295                                  HALT_CHECK_MAX_LOOPS);
296         if (ret) {
297                 dev_err(wcss->dev,
298                         "can't get SSCAON_STATUS rc:%d)\n", ret);
299                 return ret;
300         }
301
302         /* 6 - De-assert WCSS_AON reset */
303         reset_control_assert(wcss->wcss_aon_reset);
304
305         /* 7 - Disable WCSSAON_CONFIG 13 */
306         val = readl(wcss->rmb_base + SSCAON_CONFIG);
307         val &= ~SSCAON_ENABLE;
308         writel(val, wcss->rmb_base + SSCAON_CONFIG);
309
310         /* 8 - De-assert WCSS/Q6 HALTREQ */
311         reset_control_assert(wcss->wcss_reset);
312
313         return 0;
314 }
315
316 static int q6v5_q6_powerdown(struct q6v5_wcss *wcss)
317 {
318         int ret;
319         u32 val;
320         int i;
321
322         /* 1 - Halt Q6 bus interface */
323         q6v5_wcss_halt_axi_port(wcss, wcss->halt_map, wcss->halt_q6);
324
325         /* 2 - Disable Q6 Core clock */
326         val = readl(wcss->reg_base + Q6SS_GFMUX_CTL_REG);
327         val &= ~Q6SS_CLK_ENABLE;
328         writel(val, wcss->reg_base + Q6SS_GFMUX_CTL_REG);
329
330         /* 3 - Clamp I/O */
331         val = readl(wcss->reg_base + Q6SS_PWR_CTL_REG);
332         val |= Q6SS_CLAMP_IO;
333         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
334
335         /* 4 - Clamp WL */
336         val |= QDSS_BHS_ON;
337         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
338
339         /* 5 - Clear Erase standby */
340         val &= ~Q6SS_L2DATA_STBY_N;
341         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
342
343         /* 6 - Clear Sleep RTN */
344         val &= ~Q6SS_SLP_RET_N;
345         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
346
347         /* 7 - turn off Q6 memory foot/head switch one bank at a time */
348         for (i = 0; i < 20; i++) {
349                 val = readl(wcss->reg_base + Q6SS_MEM_PWR_CTL);
350                 val &= ~BIT(i);
351                 writel(val, wcss->reg_base + Q6SS_MEM_PWR_CTL);
352                 mdelay(1);
353         }
354
355         /* 8 - Assert QMC memory RTN */
356         val = readl(wcss->reg_base + Q6SS_PWR_CTL_REG);
357         val |= Q6SS_CLAMP_QMC_MEM;
358         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
359
360         /* 9 - Turn off BHS */
361         val &= ~Q6SS_BHS_ON;
362         writel(val, wcss->reg_base + Q6SS_PWR_CTL_REG);
363         udelay(1);
364
365         /* 10 - Wait till BHS Reset is done */
366         ret = readl_poll_timeout(wcss->reg_base + Q6SS_BHS_STATUS,
367                                  val, !(val & BHS_EN_REST_ACK), 1000,
368                                  HALT_CHECK_MAX_LOOPS);
369         if (ret) {
370                 dev_err(wcss->dev, "BHS_STATUS not OFF (rc:%d)\n", ret);
371                 return ret;
372         }
373
374         /* 11 -  Assert WCSS reset */
375         reset_control_assert(wcss->wcss_reset);
376
377         /* 12 - Assert Q6 reset */
378         reset_control_assert(wcss->wcss_q6_reset);
379
380         return 0;
381 }
382
383 static int q6v5_wcss_stop(struct rproc *rproc)
384 {
385         struct q6v5_wcss *wcss = rproc->priv;
386         int ret;
387
388         /* WCSS powerdown */
389         ret = qcom_q6v5_request_stop(&wcss->q6v5);
390         if (ret == -ETIMEDOUT) {
391                 dev_err(wcss->dev, "timed out on wait\n");
392                 return ret;
393         }
394
395         ret = q6v5_wcss_powerdown(wcss);
396         if (ret)
397                 return ret;
398
399         /* Q6 Power down */
400         ret = q6v5_q6_powerdown(wcss);
401         if (ret)
402                 return ret;
403
404         qcom_q6v5_unprepare(&wcss->q6v5);
405
406         return 0;
407 }
408
409 static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, int len)
410 {
411         struct q6v5_wcss *wcss = rproc->priv;
412         int offset;
413
414         offset = da - wcss->mem_reloc;
415         if (offset < 0 || offset + len > wcss->mem_size)
416                 return NULL;
417
418         return wcss->mem_region + offset;
419 }
420
421 static int q6v5_wcss_load(struct rproc *rproc, const struct firmware *fw)
422 {
423         struct q6v5_wcss *wcss = rproc->priv;
424
425         return qcom_mdt_load_no_init(wcss->dev, fw, rproc->firmware,
426                                      0, wcss->mem_region, wcss->mem_phys,
427                                      wcss->mem_size, &wcss->mem_reloc);
428 }
429
430 static const struct rproc_ops q6v5_wcss_ops = {
431         .start = q6v5_wcss_start,
432         .stop = q6v5_wcss_stop,
433         .da_to_va = q6v5_wcss_da_to_va,
434         .load = q6v5_wcss_load,
435         .get_boot_addr = rproc_elf_get_boot_addr,
436 };
437
438 static int q6v5_wcss_init_reset(struct q6v5_wcss *wcss)
439 {
440         struct device *dev = wcss->dev;
441
442         wcss->wcss_aon_reset = devm_reset_control_get(dev, "wcss_aon_reset");
443         if (IS_ERR(wcss->wcss_aon_reset)) {
444                 dev_err(wcss->dev, "unable to acquire wcss_aon_reset\n");
445                 return PTR_ERR(wcss->wcss_aon_reset);
446         }
447
448         wcss->wcss_reset = devm_reset_control_get(dev, "wcss_reset");
449         if (IS_ERR(wcss->wcss_reset)) {
450                 dev_err(wcss->dev, "unable to acquire wcss_reset\n");
451                 return PTR_ERR(wcss->wcss_reset);
452         }
453
454         wcss->wcss_q6_reset = devm_reset_control_get(dev, "wcss_q6_reset");
455         if (IS_ERR(wcss->wcss_q6_reset)) {
456                 dev_err(wcss->dev, "unable to acquire wcss_q6_reset\n");
457                 return PTR_ERR(wcss->wcss_q6_reset);
458         }
459
460         return 0;
461 }
462
463 static int q6v5_wcss_init_mmio(struct q6v5_wcss *wcss,
464                                struct platform_device *pdev)
465 {
466         struct of_phandle_args args;
467         struct resource *res;
468         int ret;
469
470         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qdsp6");
471         wcss->reg_base = devm_ioremap_resource(&pdev->dev, res);
472         if (IS_ERR(wcss->reg_base))
473                 return PTR_ERR(wcss->reg_base);
474
475         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rmb");
476         wcss->rmb_base = devm_ioremap_resource(&pdev->dev, res);
477         if (IS_ERR(wcss->rmb_base))
478                 return PTR_ERR(wcss->rmb_base);
479
480         ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
481                                                "qcom,halt-regs", 3, 0, &args);
482         if (ret < 0) {
483                 dev_err(&pdev->dev, "failed to parse qcom,halt-regs\n");
484                 return -EINVAL;
485         }
486
487         wcss->halt_map = syscon_node_to_regmap(args.np);
488         of_node_put(args.np);
489         if (IS_ERR(wcss->halt_map))
490                 return PTR_ERR(wcss->halt_map);
491
492         wcss->halt_q6 = args.args[0];
493         wcss->halt_wcss = args.args[1];
494         wcss->halt_nc = args.args[2];
495
496         return 0;
497 }
498
499 static int q6v5_alloc_memory_region(struct q6v5_wcss *wcss)
500 {
501         struct reserved_mem *rmem = NULL;
502         struct device_node *node;
503         struct device *dev = wcss->dev;
504
505         node = of_parse_phandle(dev->of_node, "memory-region", 0);
506         if (node)
507                 rmem = of_reserved_mem_lookup(node);
508         of_node_put(node);
509
510         if (!rmem) {
511                 dev_err(dev, "unable to acquire memory-region\n");
512                 return -EINVAL;
513         }
514
515         wcss->mem_phys = rmem->base;
516         wcss->mem_reloc = rmem->base;
517         wcss->mem_size = rmem->size;
518         wcss->mem_region = devm_ioremap_wc(dev, wcss->mem_phys, wcss->mem_size);
519         if (!wcss->mem_region) {
520                 dev_err(dev, "unable to map memory region: %pa+%pa\n",
521                         &rmem->base, &rmem->size);
522                 return -EBUSY;
523         }
524
525         return 0;
526 }
527
528 static int q6v5_wcss_probe(struct platform_device *pdev)
529 {
530         struct q6v5_wcss *wcss;
531         struct rproc *rproc;
532         int ret;
533
534         rproc = rproc_alloc(&pdev->dev, pdev->name, &q6v5_wcss_ops,
535                             "/*(DEBLOBBED)*/", sizeof(*wcss));
536         if (!rproc) {
537                 dev_err(&pdev->dev, "failed to allocate rproc\n");
538                 return -ENOMEM;
539         }
540
541         wcss = rproc->priv;
542         wcss->dev = &pdev->dev;
543
544         ret = q6v5_wcss_init_mmio(wcss, pdev);
545         if (ret)
546                 goto free_rproc;
547
548         ret = q6v5_alloc_memory_region(wcss);
549         if (ret)
550                 goto free_rproc;
551
552         ret = q6v5_wcss_init_reset(wcss);
553         if (ret)
554                 goto free_rproc;
555
556         ret = qcom_q6v5_init(&wcss->q6v5, pdev, rproc, WCSS_CRASH_REASON, NULL);
557         if (ret)
558                 goto free_rproc;
559
560         ret = rproc_add(rproc);
561         if (ret)
562                 goto free_rproc;
563
564         platform_set_drvdata(pdev, rproc);
565
566         return 0;
567
568 free_rproc:
569         rproc_free(rproc);
570
571         return ret;
572 }
573
574 static int q6v5_wcss_remove(struct platform_device *pdev)
575 {
576         struct rproc *rproc = platform_get_drvdata(pdev);
577
578         rproc_del(rproc);
579         rproc_free(rproc);
580
581         return 0;
582 }
583
584 static const struct of_device_id q6v5_wcss_of_match[] = {
585         { .compatible = "qcom,ipq8074-wcss-pil" },
586         { },
587 };
588 MODULE_DEVICE_TABLE(of, q6v5_wcss_of_match);
589
590 static struct platform_driver q6v5_wcss_driver = {
591         .probe = q6v5_wcss_probe,
592         .remove = q6v5_wcss_remove,
593         .driver = {
594                 .name = "qcom-q6v5-wcss-pil",
595                 .of_match_table = q6v5_wcss_of_match,
596         },
597 };
598 module_platform_driver(q6v5_wcss_driver);
599
600 MODULE_DESCRIPTION("Hexagon WCSS Peripheral Image Loader");
601 MODULE_LICENSE("GPL v2");