This source file includes following definitions.
- keystone_rproc_dsp_reset
- keystone_rproc_dsp_boot
- keystone_rproc_exception_interrupt
- handle_event
- keystone_rproc_vring_interrupt
- keystone_rproc_start
- keystone_rproc_stop
- keystone_rproc_kick
- keystone_rproc_da_to_va
- keystone_rproc_of_get_memories
- keystone_rproc_of_get_dev_syscon
- keystone_rproc_probe
- keystone_rproc_remove
1
2
3
4
5
6
7
8 #include <linux/module.h>
9 #include <linux/slab.h>
10 #include <linux/io.h>
11 #include <linux/interrupt.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/workqueue.h>
15 #include <linux/of_address.h>
16 #include <linux/of_reserved_mem.h>
17 #include <linux/of_gpio.h>
18 #include <linux/regmap.h>
19 #include <linux/mfd/syscon.h>
20 #include <linux/remoteproc.h>
21 #include <linux/reset.h>
22
23 #include "remoteproc_internal.h"
24
25 #define KEYSTONE_RPROC_LOCAL_ADDRESS_MASK (SZ_16M - 1)
26
27
28
29
30
31
32
33
34 struct keystone_rproc_mem {
35 void __iomem *cpu_addr;
36 phys_addr_t bus_addr;
37 u32 dev_addr;
38 size_t size;
39 };
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55 struct keystone_rproc {
56 struct device *dev;
57 struct rproc *rproc;
58 struct keystone_rproc_mem *mem;
59 int num_mems;
60 struct regmap *dev_ctrl;
61 struct reset_control *reset;
62 u32 boot_offset;
63 int irq_ring;
64 int irq_fault;
65 int kick_gpio;
66 struct work_struct workqueue;
67 };
68
69
70 static void keystone_rproc_dsp_reset(struct keystone_rproc *ksproc)
71 {
72 reset_control_assert(ksproc->reset);
73 }
74
75
76 static int keystone_rproc_dsp_boot(struct keystone_rproc *ksproc, u32 boot_addr)
77 {
78 int ret;
79
80 if (boot_addr & (SZ_1K - 1)) {
81 dev_err(ksproc->dev, "invalid boot address 0x%x, must be aligned on a 1KB boundary\n",
82 boot_addr);
83 return -EINVAL;
84 }
85
86 ret = regmap_write(ksproc->dev_ctrl, ksproc->boot_offset, boot_addr);
87 if (ret) {
88 dev_err(ksproc->dev, "regmap_write of boot address failed, status = %d\n",
89 ret);
90 return ret;
91 }
92
93 reset_control_deassert(ksproc->reset);
94
95 return 0;
96 }
97
98
99
100
101
102
103
104
105
106
107
108
109 static irqreturn_t keystone_rproc_exception_interrupt(int irq, void *dev_id)
110 {
111 struct keystone_rproc *ksproc = dev_id;
112
113 rproc_report_crash(ksproc->rproc, RPROC_FATAL_ERROR);
114
115 return IRQ_HANDLED;
116 }
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141 static void handle_event(struct work_struct *work)
142 {
143 struct keystone_rproc *ksproc =
144 container_of(work, struct keystone_rproc, workqueue);
145
146 rproc_vq_interrupt(ksproc->rproc, 0);
147 rproc_vq_interrupt(ksproc->rproc, 1);
148 }
149
150
151
152
153 static irqreturn_t keystone_rproc_vring_interrupt(int irq, void *dev_id)
154 {
155 struct keystone_rproc *ksproc = dev_id;
156
157 schedule_work(&ksproc->workqueue);
158
159 return IRQ_HANDLED;
160 }
161
162
163
164
165
166
167
168
169 static int keystone_rproc_start(struct rproc *rproc)
170 {
171 struct keystone_rproc *ksproc = rproc->priv;
172 int ret;
173
174 INIT_WORK(&ksproc->workqueue, handle_event);
175
176 ret = request_irq(ksproc->irq_ring, keystone_rproc_vring_interrupt, 0,
177 dev_name(ksproc->dev), ksproc);
178 if (ret) {
179 dev_err(ksproc->dev, "failed to enable vring interrupt, ret = %d\n",
180 ret);
181 goto out;
182 }
183
184 ret = request_irq(ksproc->irq_fault, keystone_rproc_exception_interrupt,
185 0, dev_name(ksproc->dev), ksproc);
186 if (ret) {
187 dev_err(ksproc->dev, "failed to enable exception interrupt, ret = %d\n",
188 ret);
189 goto free_vring_irq;
190 }
191
192 ret = keystone_rproc_dsp_boot(ksproc, rproc->bootaddr);
193 if (ret)
194 goto free_exc_irq;
195
196 return 0;
197
198 free_exc_irq:
199 free_irq(ksproc->irq_fault, ksproc);
200 free_vring_irq:
201 free_irq(ksproc->irq_ring, ksproc);
202 flush_work(&ksproc->workqueue);
203 out:
204 return ret;
205 }
206
207
208
209
210
211
212
213 static int keystone_rproc_stop(struct rproc *rproc)
214 {
215 struct keystone_rproc *ksproc = rproc->priv;
216
217 keystone_rproc_dsp_reset(ksproc);
218 free_irq(ksproc->irq_fault, ksproc);
219 free_irq(ksproc->irq_ring, ksproc);
220 flush_work(&ksproc->workqueue);
221
222 return 0;
223 }
224
225
226
227
228
229
230
231 static void keystone_rproc_kick(struct rproc *rproc, int vqid)
232 {
233 struct keystone_rproc *ksproc = rproc->priv;
234
235 if (WARN_ON(ksproc->kick_gpio < 0))
236 return;
237
238 gpio_set_value(ksproc->kick_gpio, 1);
239 }
240
241
242
243
244
245
246
247
248
249 static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
250 {
251 struct keystone_rproc *ksproc = rproc->priv;
252 void __iomem *va = NULL;
253 phys_addr_t bus_addr;
254 u32 dev_addr, offset;
255 size_t size;
256 int i;
257
258 if (len <= 0)
259 return NULL;
260
261 for (i = 0; i < ksproc->num_mems; i++) {
262 bus_addr = ksproc->mem[i].bus_addr;
263 dev_addr = ksproc->mem[i].dev_addr;
264 size = ksproc->mem[i].size;
265
266 if (da < KEYSTONE_RPROC_LOCAL_ADDRESS_MASK) {
267
268 if ((da >= dev_addr) &&
269 ((da + len) <= (dev_addr + size))) {
270 offset = da - dev_addr;
271 va = ksproc->mem[i].cpu_addr + offset;
272 break;
273 }
274 } else {
275
276 if ((da >= bus_addr) &&
277 (da + len) <= (bus_addr + size)) {
278 offset = da - bus_addr;
279 va = ksproc->mem[i].cpu_addr + offset;
280 break;
281 }
282 }
283 }
284
285 return (__force void *)va;
286 }
287
288 static const struct rproc_ops keystone_rproc_ops = {
289 .start = keystone_rproc_start,
290 .stop = keystone_rproc_stop,
291 .kick = keystone_rproc_kick,
292 .da_to_va = keystone_rproc_da_to_va,
293 };
294
295 static int keystone_rproc_of_get_memories(struct platform_device *pdev,
296 struct keystone_rproc *ksproc)
297 {
298 static const char * const mem_names[] = {"l2sram", "l1pram", "l1dram"};
299 struct device *dev = &pdev->dev;
300 struct resource *res;
301 int num_mems = 0;
302 int i;
303
304 num_mems = ARRAY_SIZE(mem_names);
305 ksproc->mem = devm_kcalloc(ksproc->dev, num_mems,
306 sizeof(*ksproc->mem), GFP_KERNEL);
307 if (!ksproc->mem)
308 return -ENOMEM;
309
310 for (i = 0; i < num_mems; i++) {
311 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
312 mem_names[i]);
313 ksproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
314 if (IS_ERR(ksproc->mem[i].cpu_addr)) {
315 dev_err(dev, "failed to parse and map %s memory\n",
316 mem_names[i]);
317 return PTR_ERR(ksproc->mem[i].cpu_addr);
318 }
319 ksproc->mem[i].bus_addr = res->start;
320 ksproc->mem[i].dev_addr =
321 res->start & KEYSTONE_RPROC_LOCAL_ADDRESS_MASK;
322 ksproc->mem[i].size = resource_size(res);
323
324
325 memset((__force void *)ksproc->mem[i].cpu_addr, 0,
326 ksproc->mem[i].size);
327 }
328 ksproc->num_mems = num_mems;
329
330 return 0;
331 }
332
333 static int keystone_rproc_of_get_dev_syscon(struct platform_device *pdev,
334 struct keystone_rproc *ksproc)
335 {
336 struct device_node *np = pdev->dev.of_node;
337 struct device *dev = &pdev->dev;
338 int ret;
339
340 if (!of_property_read_bool(np, "ti,syscon-dev")) {
341 dev_err(dev, "ti,syscon-dev property is absent\n");
342 return -EINVAL;
343 }
344
345 ksproc->dev_ctrl =
346 syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev");
347 if (IS_ERR(ksproc->dev_ctrl)) {
348 ret = PTR_ERR(ksproc->dev_ctrl);
349 return ret;
350 }
351
352 if (of_property_read_u32_index(np, "ti,syscon-dev", 1,
353 &ksproc->boot_offset)) {
354 dev_err(dev, "couldn't read the boot register offset\n");
355 return -EINVAL;
356 }
357
358 return 0;
359 }
360
361 static int keystone_rproc_probe(struct platform_device *pdev)
362 {
363 struct device *dev = &pdev->dev;
364 struct device_node *np = dev->of_node;
365 struct keystone_rproc *ksproc;
366 struct rproc *rproc;
367 int dsp_id;
368 char *fw_name = NULL;
369 char *template = "keystone-dsp%d-fw";
370 int name_len = 0;
371 int ret = 0;
372
373 if (!np) {
374 dev_err(dev, "only DT-based devices are supported\n");
375 return -ENODEV;
376 }
377
378 dsp_id = of_alias_get_id(np, "rproc");
379 if (dsp_id < 0) {
380 dev_warn(dev, "device does not have an alias id\n");
381 return dsp_id;
382 }
383
384
385 name_len = strlen(template);
386 fw_name = devm_kzalloc(dev, name_len, GFP_KERNEL);
387 if (!fw_name)
388 return -ENOMEM;
389 snprintf(fw_name, name_len, template, dsp_id);
390
391 rproc = rproc_alloc(dev, dev_name(dev), &keystone_rproc_ops, fw_name,
392 sizeof(*ksproc));
393 if (!rproc)
394 return -ENOMEM;
395
396 rproc->has_iommu = false;
397 ksproc = rproc->priv;
398 ksproc->rproc = rproc;
399 ksproc->dev = dev;
400
401 ret = keystone_rproc_of_get_dev_syscon(pdev, ksproc);
402 if (ret)
403 goto free_rproc;
404
405 ksproc->reset = devm_reset_control_get_exclusive(dev, NULL);
406 if (IS_ERR(ksproc->reset)) {
407 ret = PTR_ERR(ksproc->reset);
408 goto free_rproc;
409 }
410
411
412 pm_runtime_enable(dev);
413 ret = pm_runtime_get_sync(dev);
414 if (ret < 0) {
415 dev_err(dev, "failed to enable clock, status = %d\n", ret);
416 pm_runtime_put_noidle(dev);
417 goto disable_rpm;
418 }
419
420 ret = keystone_rproc_of_get_memories(pdev, ksproc);
421 if (ret)
422 goto disable_clk;
423
424 ksproc->irq_ring = platform_get_irq_byname(pdev, "vring");
425 if (ksproc->irq_ring < 0) {
426 ret = ksproc->irq_ring;
427 goto disable_clk;
428 }
429
430 ksproc->irq_fault = platform_get_irq_byname(pdev, "exception");
431 if (ksproc->irq_fault < 0) {
432 ret = ksproc->irq_fault;
433 goto disable_clk;
434 }
435
436 ksproc->kick_gpio = of_get_named_gpio_flags(np, "kick-gpios", 0, NULL);
437 if (ksproc->kick_gpio < 0) {
438 ret = ksproc->kick_gpio;
439 dev_err(dev, "failed to get gpio for virtio kicks, status = %d\n",
440 ret);
441 goto disable_clk;
442 }
443
444 if (of_reserved_mem_device_init(dev))
445 dev_warn(dev, "device does not have specific CMA pool\n");
446
447
448 ret = reset_control_status(ksproc->reset);
449 if (ret < 0) {
450 dev_err(dev, "failed to get reset status, status = %d\n", ret);
451 goto release_mem;
452 } else if (ret == 0) {
453 WARN(1, "device is not in reset\n");
454 keystone_rproc_dsp_reset(ksproc);
455 }
456
457 ret = rproc_add(rproc);
458 if (ret) {
459 dev_err(dev, "failed to add register device with remoteproc core, status = %d\n",
460 ret);
461 goto release_mem;
462 }
463
464 platform_set_drvdata(pdev, ksproc);
465
466 return 0;
467
468 release_mem:
469 of_reserved_mem_device_release(dev);
470 disable_clk:
471 pm_runtime_put_sync(dev);
472 disable_rpm:
473 pm_runtime_disable(dev);
474 free_rproc:
475 rproc_free(rproc);
476 return ret;
477 }
478
479 static int keystone_rproc_remove(struct platform_device *pdev)
480 {
481 struct keystone_rproc *ksproc = platform_get_drvdata(pdev);
482
483 rproc_del(ksproc->rproc);
484 pm_runtime_put_sync(&pdev->dev);
485 pm_runtime_disable(&pdev->dev);
486 rproc_free(ksproc->rproc);
487 of_reserved_mem_device_release(&pdev->dev);
488
489 return 0;
490 }
491
492 static const struct of_device_id keystone_rproc_of_match[] = {
493 { .compatible = "ti,k2hk-dsp", },
494 { .compatible = "ti,k2l-dsp", },
495 { .compatible = "ti,k2e-dsp", },
496 { .compatible = "ti,k2g-dsp", },
497 { },
498 };
499 MODULE_DEVICE_TABLE(of, keystone_rproc_of_match);
500
501 static struct platform_driver keystone_rproc_driver = {
502 .probe = keystone_rproc_probe,
503 .remove = keystone_rproc_remove,
504 .driver = {
505 .name = "keystone-rproc",
506 .of_match_table = keystone_rproc_of_match,
507 },
508 };
509
510 module_platform_driver(keystone_rproc_driver);
511
512 MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
513 MODULE_LICENSE("GPL v2");
514 MODULE_DESCRIPTION("TI Keystone DSP Remoteproc driver");