1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2018 MediaTek Inc.
4
5 #include <linux/bitops.h>
6 #include <linux/clk.h>
7 #include <linux/clk-provider.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/errno.h>
10 #include <linux/interrupt.h>
11 #include <linux/io.h>
12 #include <linux/iopoll.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/mailbox_controller.h>
17 #include <linux/mailbox/mtk-cmdq-mailbox.h>
18 #include <linux/of_device.h>
19
20 #define CMDQ_OP_CODE_MASK (0xff << CMDQ_OP_CODE_SHIFT)
21 #define CMDQ_NUM_CMD(t) (t->cmd_buf_size / CMDQ_INST_SIZE)
22 #define CMDQ_GCE_NUM_MAX (2)
23
24 #define CMDQ_CURR_IRQ_STATUS 0x10
25 #define CMDQ_SYNC_TOKEN_UPDATE 0x68
26 #define CMDQ_THR_SLOT_CYCLES 0x30
27 #define CMDQ_THR_BASE 0x100
28 #define CMDQ_THR_SIZE 0x80
29 #define CMDQ_THR_WARM_RESET 0x00
30 #define CMDQ_THR_ENABLE_TASK 0x04
31 #define CMDQ_THR_SUSPEND_TASK 0x08
32 #define CMDQ_THR_CURR_STATUS 0x0c
33 #define CMDQ_THR_IRQ_STATUS 0x10
34 #define CMDQ_THR_IRQ_ENABLE 0x14
35 #define CMDQ_THR_CURR_ADDR 0x20
36 #define CMDQ_THR_END_ADDR 0x24
37 #define CMDQ_THR_WAIT_TOKEN 0x30
38 #define CMDQ_THR_PRIORITY 0x40
39
40 #define GCE_GCTL_VALUE 0x48
41
42 #define CMDQ_THR_ACTIVE_SLOT_CYCLES 0x3200
43 #define CMDQ_THR_ENABLED 0x1
44 #define CMDQ_THR_DISABLED 0x0
45 #define CMDQ_THR_SUSPEND 0x1
46 #define CMDQ_THR_RESUME 0x0
47 #define CMDQ_THR_STATUS_SUSPENDED BIT(1)
48 #define CMDQ_THR_DO_WARM_RESET BIT(0)
49 #define CMDQ_THR_IRQ_DONE 0x1
50 #define CMDQ_THR_IRQ_ERROR 0x12
51 #define CMDQ_THR_IRQ_EN (CMDQ_THR_IRQ_ERROR | CMDQ_THR_IRQ_DONE)
52 #define CMDQ_THR_IS_WAITING BIT(31)
53
54 #define CMDQ_JUMP_BY_OFFSET 0x10000000
55 #define CMDQ_JUMP_BY_PA 0x10000001
56
57 struct cmdq_thread {
58 struct mbox_chan *chan;
59 void __iomem *base;
60 struct list_head task_busy_list;
61 u32 priority;
62 };
63
64 struct cmdq_task {
65 struct cmdq *cmdq;
66 struct list_head list_entry;
67 dma_addr_t pa_base;
68 struct cmdq_thread *thread;
69 struct cmdq_pkt *pkt; /* the packet sent from mailbox client */
70 };
71
72 struct cmdq {
73 struct mbox_controller mbox;
74 void __iomem *base;
75 int irq;
76 u32 thread_nr;
77 u32 irq_mask;
78 struct cmdq_thread *thread;
79 struct clk_bulk_data clocks[CMDQ_GCE_NUM_MAX];
80 bool suspended;
81 u8 shift_pa;
82 bool control_by_sw;
83 u32 gce_num;
84 };
85
86 struct gce_plat {
87 u32 thread_nr;
88 u8 shift;
89 bool control_by_sw;
90 u32 gce_num;
91 };
92
cmdq_get_shift_pa(struct mbox_chan * chan)93 u8 cmdq_get_shift_pa(struct mbox_chan *chan)
94 {
95 struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
96
97 return cmdq->shift_pa;
98 }
99 EXPORT_SYMBOL(cmdq_get_shift_pa);
100
cmdq_thread_suspend(struct cmdq * cmdq,struct cmdq_thread * thread)101 static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
102 {
103 u32 status;
104
105 writel(CMDQ_THR_SUSPEND, thread->base + CMDQ_THR_SUSPEND_TASK);
106
107 /* If already disabled, treat as suspended successful. */
108 if (!(readl(thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
109 return 0;
110
111 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_CURR_STATUS,
112 status, status & CMDQ_THR_STATUS_SUSPENDED, 0, 10)) {
113 dev_err(cmdq->mbox.dev, "suspend GCE thread 0x%x failed\n",
114 (u32)(thread->base - cmdq->base));
115 return -EFAULT;
116 }
117
118 return 0;
119 }
120
cmdq_thread_resume(struct cmdq_thread * thread)121 static void cmdq_thread_resume(struct cmdq_thread *thread)
122 {
123 writel(CMDQ_THR_RESUME, thread->base + CMDQ_THR_SUSPEND_TASK);
124 }
125
cmdq_init(struct cmdq * cmdq)126 static void cmdq_init(struct cmdq *cmdq)
127 {
128 int i;
129
130 WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
131 if (cmdq->control_by_sw)
132 writel(0x7, cmdq->base + GCE_GCTL_VALUE);
133 writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base + CMDQ_THR_SLOT_CYCLES);
134 for (i = 0; i <= CMDQ_MAX_EVENT; i++)
135 writel(i, cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);
136 clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
137 }
138
cmdq_thread_reset(struct cmdq * cmdq,struct cmdq_thread * thread)139 static int cmdq_thread_reset(struct cmdq *cmdq, struct cmdq_thread *thread)
140 {
141 u32 warm_reset;
142
143 writel(CMDQ_THR_DO_WARM_RESET, thread->base + CMDQ_THR_WARM_RESET);
144 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_WARM_RESET,
145 warm_reset, !(warm_reset & CMDQ_THR_DO_WARM_RESET),
146 0, 10)) {
147 dev_err(cmdq->mbox.dev, "reset GCE thread 0x%x failed\n",
148 (u32)(thread->base - cmdq->base));
149 return -EFAULT;
150 }
151
152 return 0;
153 }
154
cmdq_thread_disable(struct cmdq * cmdq,struct cmdq_thread * thread)155 static void cmdq_thread_disable(struct cmdq *cmdq, struct cmdq_thread *thread)
156 {
157 cmdq_thread_reset(cmdq, thread);
158 writel(CMDQ_THR_DISABLED, thread->base + CMDQ_THR_ENABLE_TASK);
159 }
160
161 /* notify GCE to re-fetch commands by setting GCE thread PC */
cmdq_thread_invalidate_fetched_data(struct cmdq_thread * thread)162 static void cmdq_thread_invalidate_fetched_data(struct cmdq_thread *thread)
163 {
164 writel(readl(thread->base + CMDQ_THR_CURR_ADDR),
165 thread->base + CMDQ_THR_CURR_ADDR);
166 }
167
cmdq_task_insert_into_thread(struct cmdq_task * task)168 static void cmdq_task_insert_into_thread(struct cmdq_task *task)
169 {
170 struct device *dev = task->cmdq->mbox.dev;
171 struct cmdq_thread *thread = task->thread;
172 struct cmdq_task *prev_task = list_last_entry(
173 &thread->task_busy_list, typeof(*task), list_entry);
174 u64 *prev_task_base = prev_task->pkt->va_base;
175
176 /* let previous task jump to this task */
177 dma_sync_single_for_cpu(dev, prev_task->pa_base,
178 prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
179 prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] =
180 (u64)CMDQ_JUMP_BY_PA << 32 |
181 (task->pa_base >> task->cmdq->shift_pa);
182 dma_sync_single_for_device(dev, prev_task->pa_base,
183 prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
184
185 cmdq_thread_invalidate_fetched_data(thread);
186 }
187
cmdq_thread_is_in_wfe(struct cmdq_thread * thread)188 static bool cmdq_thread_is_in_wfe(struct cmdq_thread *thread)
189 {
190 return readl(thread->base + CMDQ_THR_WAIT_TOKEN) & CMDQ_THR_IS_WAITING;
191 }
192
cmdq_task_exec_done(struct cmdq_task * task,int sta)193 static void cmdq_task_exec_done(struct cmdq_task *task, int sta)
194 {
195 struct cmdq_task_cb *cb = &task->pkt->async_cb;
196 struct cmdq_cb_data data;
197
198 data.sta = sta;
199 data.data = cb->data;
200 data.pkt = task->pkt;
201 if (cb->cb)
202 cb->cb(data);
203
204 mbox_chan_received_data(task->thread->chan, &data);
205
206 list_del(&task->list_entry);
207 }
208
cmdq_task_handle_error(struct cmdq_task * task)209 static void cmdq_task_handle_error(struct cmdq_task *task)
210 {
211 struct cmdq_thread *thread = task->thread;
212 struct cmdq_task *next_task;
213 struct cmdq *cmdq = task->cmdq;
214
215 dev_err(cmdq->mbox.dev, "task 0x%p error\n", task);
216 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
217 next_task = list_first_entry_or_null(&thread->task_busy_list,
218 struct cmdq_task, list_entry);
219 if (next_task)
220 writel(next_task->pa_base >> cmdq->shift_pa,
221 thread->base + CMDQ_THR_CURR_ADDR);
222 cmdq_thread_resume(thread);
223 }
224
cmdq_thread_irq_handler(struct cmdq * cmdq,struct cmdq_thread * thread)225 static void cmdq_thread_irq_handler(struct cmdq *cmdq,
226 struct cmdq_thread *thread)
227 {
228 struct cmdq_task *task, *tmp, *curr_task = NULL;
229 u32 curr_pa, irq_flag, task_end_pa;
230 bool err;
231
232 irq_flag = readl(thread->base + CMDQ_THR_IRQ_STATUS);
233 writel(~irq_flag, thread->base + CMDQ_THR_IRQ_STATUS);
234
235 /*
236 * When ISR call this function, another CPU core could run
237 * "release task" right before we acquire the spin lock, and thus
238 * reset / disable this GCE thread, so we need to check the enable
239 * bit of this GCE thread.
240 */
241 if (!(readl(thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
242 return;
243
244 if (irq_flag & CMDQ_THR_IRQ_ERROR)
245 err = true;
246 else if (irq_flag & CMDQ_THR_IRQ_DONE)
247 err = false;
248 else
249 return;
250
251 curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) << cmdq->shift_pa;
252
253 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
254 list_entry) {
255 task_end_pa = task->pa_base + task->pkt->cmd_buf_size;
256 if (curr_pa >= task->pa_base && curr_pa < task_end_pa)
257 curr_task = task;
258
259 if (!curr_task || curr_pa == task_end_pa - CMDQ_INST_SIZE) {
260 cmdq_task_exec_done(task, 0);
261 kfree(task);
262 } else if (err) {
263 cmdq_task_exec_done(task, -ENOEXEC);
264 cmdq_task_handle_error(curr_task);
265 kfree(task);
266 }
267
268 if (curr_task)
269 break;
270 }
271
272 if (list_empty(&thread->task_busy_list)) {
273 cmdq_thread_disable(cmdq, thread);
274 clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
275 }
276 }
277
cmdq_irq_handler(int irq,void * dev)278 static irqreturn_t cmdq_irq_handler(int irq, void *dev)
279 {
280 struct cmdq *cmdq = dev;
281 unsigned long irq_status, flags = 0L;
282 int bit;
283
284 irq_status = readl(cmdq->base + CMDQ_CURR_IRQ_STATUS) & cmdq->irq_mask;
285 if (!(irq_status ^ cmdq->irq_mask))
286 return IRQ_NONE;
287
288 for_each_clear_bit(bit, &irq_status, cmdq->thread_nr) {
289 struct cmdq_thread *thread = &cmdq->thread[bit];
290
291 spin_lock_irqsave(&thread->chan->lock, flags);
292 cmdq_thread_irq_handler(cmdq, thread);
293 spin_unlock_irqrestore(&thread->chan->lock, flags);
294 }
295
296 return IRQ_HANDLED;
297 }
298
cmdq_suspend(struct device * dev)299 static int cmdq_suspend(struct device *dev)
300 {
301 struct cmdq *cmdq = dev_get_drvdata(dev);
302 struct cmdq_thread *thread;
303 int i;
304 bool task_running = false;
305
306 cmdq->suspended = true;
307
308 for (i = 0; i < cmdq->thread_nr; i++) {
309 thread = &cmdq->thread[i];
310 if (!list_empty(&thread->task_busy_list)) {
311 task_running = true;
312 break;
313 }
314 }
315
316 if (task_running)
317 dev_warn(dev, "exist running task(s) in suspend\n");
318
319 clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
320
321 return 0;
322 }
323
cmdq_resume(struct device * dev)324 static int cmdq_resume(struct device *dev)
325 {
326 struct cmdq *cmdq = dev_get_drvdata(dev);
327
328 WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
329 cmdq->suspended = false;
330 return 0;
331 }
332
cmdq_remove(struct platform_device * pdev)333 static int cmdq_remove(struct platform_device *pdev)
334 {
335 struct cmdq *cmdq = platform_get_drvdata(pdev);
336
337 clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
338 return 0;
339 }
340
cmdq_mbox_send_data(struct mbox_chan * chan,void * data)341 static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
342 {
343 struct cmdq_pkt *pkt = (struct cmdq_pkt *)data;
344 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
345 struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
346 struct cmdq_task *task;
347 unsigned long curr_pa, end_pa;
348
349 /* Client should not flush new tasks if suspended. */
350 WARN_ON(cmdq->suspended);
351
352 task = kzalloc(sizeof(*task), GFP_ATOMIC);
353 if (!task)
354 return -ENOMEM;
355
356 task->cmdq = cmdq;
357 INIT_LIST_HEAD(&task->list_entry);
358 task->pa_base = pkt->pa_base;
359 task->thread = thread;
360 task->pkt = pkt;
361
362 if (list_empty(&thread->task_busy_list)) {
363 WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
364
365 /*
366 * The thread reset will clear thread related register to 0,
367 * including pc, end, priority, irq, suspend and enable. Thus
368 * set CMDQ_THR_ENABLED to CMDQ_THR_ENABLE_TASK will enable
369 * thread and make it running.
370 */
371 WARN_ON(cmdq_thread_reset(cmdq, thread) < 0);
372
373 writel(task->pa_base >> cmdq->shift_pa,
374 thread->base + CMDQ_THR_CURR_ADDR);
375 writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
376 thread->base + CMDQ_THR_END_ADDR);
377
378 writel(thread->priority, thread->base + CMDQ_THR_PRIORITY);
379 writel(CMDQ_THR_IRQ_EN, thread->base + CMDQ_THR_IRQ_ENABLE);
380 writel(CMDQ_THR_ENABLED, thread->base + CMDQ_THR_ENABLE_TASK);
381 } else {
382 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
383 curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) <<
384 cmdq->shift_pa;
385 end_pa = readl(thread->base + CMDQ_THR_END_ADDR) <<
386 cmdq->shift_pa;
387 /* check boundary */
388 if (curr_pa == end_pa - CMDQ_INST_SIZE ||
389 curr_pa == end_pa) {
390 /* set to this task directly */
391 writel(task->pa_base >> cmdq->shift_pa,
392 thread->base + CMDQ_THR_CURR_ADDR);
393 } else {
394 cmdq_task_insert_into_thread(task);
395 smp_mb(); /* modify jump before enable thread */
396 }
397 writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
398 thread->base + CMDQ_THR_END_ADDR);
399 cmdq_thread_resume(thread);
400 }
401 list_move_tail(&task->list_entry, &thread->task_busy_list);
402
403 return 0;
404 }
405
cmdq_mbox_startup(struct mbox_chan * chan)406 static int cmdq_mbox_startup(struct mbox_chan *chan)
407 {
408 return 0;
409 }
410
cmdq_mbox_shutdown(struct mbox_chan * chan)411 static void cmdq_mbox_shutdown(struct mbox_chan *chan)
412 {
413 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
414 struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
415 struct cmdq_task *task, *tmp;
416 unsigned long flags;
417
418 spin_lock_irqsave(&thread->chan->lock, flags);
419 if (list_empty(&thread->task_busy_list))
420 goto done;
421
422 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
423
424 /* make sure executed tasks have success callback */
425 cmdq_thread_irq_handler(cmdq, thread);
426 if (list_empty(&thread->task_busy_list))
427 goto done;
428
429 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
430 list_entry) {
431 cmdq_task_exec_done(task, -ECONNABORTED);
432 kfree(task);
433 }
434
435 cmdq_thread_disable(cmdq, thread);
436 clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
437
438 done:
439 /*
440 * The thread->task_busy_list empty means thread already disable. The
441 * cmdq_mbox_send_data() always reset thread which clear disable and
442 * suspend statue when first pkt send to channel, so there is no need
443 * to do any operation here, only unlock and leave.
444 */
445 spin_unlock_irqrestore(&thread->chan->lock, flags);
446 }
447
cmdq_mbox_flush(struct mbox_chan * chan,unsigned long timeout)448 static int cmdq_mbox_flush(struct mbox_chan *chan, unsigned long timeout)
449 {
450 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
451 struct cmdq_task_cb *cb;
452 struct cmdq_cb_data data;
453 struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
454 struct cmdq_task *task, *tmp;
455 unsigned long flags;
456 u32 enable;
457
458 spin_lock_irqsave(&thread->chan->lock, flags);
459 if (list_empty(&thread->task_busy_list))
460 goto out;
461
462 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
463 if (!cmdq_thread_is_in_wfe(thread))
464 goto wait;
465
466 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
467 list_entry) {
468 cb = &task->pkt->async_cb;
469 data.sta = -ECONNABORTED;
470 data.data = cb->data;
471 data.pkt = task->pkt;
472 if (cb->cb)
473 cb->cb(data);
474
475 mbox_chan_received_data(task->thread->chan, &data);
476 list_del(&task->list_entry);
477 kfree(task);
478 }
479
480 cmdq_thread_resume(thread);
481 cmdq_thread_disable(cmdq, thread);
482 clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
483
484 out:
485 spin_unlock_irqrestore(&thread->chan->lock, flags);
486 return 0;
487
488 wait:
489 cmdq_thread_resume(thread);
490 spin_unlock_irqrestore(&thread->chan->lock, flags);
491 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_ENABLE_TASK,
492 enable, enable == 0, 1, timeout)) {
493 dev_err(cmdq->mbox.dev, "Fail to wait GCE thread 0x%x done\n",
494 (u32)(thread->base - cmdq->base));
495
496 return -EFAULT;
497 }
498 return 0;
499 }
500
501 static const struct mbox_chan_ops cmdq_mbox_chan_ops = {
502 .send_data = cmdq_mbox_send_data,
503 .startup = cmdq_mbox_startup,
504 .shutdown = cmdq_mbox_shutdown,
505 .flush = cmdq_mbox_flush,
506 };
507
cmdq_xlate(struct mbox_controller * mbox,const struct of_phandle_args * sp)508 static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,
509 const struct of_phandle_args *sp)
510 {
511 int ind = sp->args[0];
512 struct cmdq_thread *thread;
513
514 if (ind >= mbox->num_chans)
515 return ERR_PTR(-EINVAL);
516
517 thread = (struct cmdq_thread *)mbox->chans[ind].con_priv;
518 thread->priority = sp->args[1];
519 thread->chan = &mbox->chans[ind];
520
521 return &mbox->chans[ind];
522 }
523
cmdq_probe(struct platform_device * pdev)524 static int cmdq_probe(struct platform_device *pdev)
525 {
526 struct device *dev = &pdev->dev;
527 struct cmdq *cmdq;
528 int err, i;
529 struct gce_plat *plat_data;
530 struct device_node *phandle = dev->of_node;
531 struct device_node *node;
532 int alias_id = 0;
533 static const char * const clk_name = "gce";
534 static const char * const clk_names[] = { "gce0", "gce1" };
535
536 cmdq = devm_kzalloc(dev, sizeof(*cmdq), GFP_KERNEL);
537 if (!cmdq)
538 return -ENOMEM;
539
540 cmdq->base = devm_platform_ioremap_resource(pdev, 0);
541 if (IS_ERR(cmdq->base))
542 return PTR_ERR(cmdq->base);
543
544 cmdq->irq = platform_get_irq(pdev, 0);
545 if (cmdq->irq < 0)
546 return cmdq->irq;
547
548 plat_data = (struct gce_plat *)of_device_get_match_data(dev);
549 if (!plat_data) {
550 dev_err(dev, "failed to get match data\n");
551 return -EINVAL;
552 }
553
554 cmdq->thread_nr = plat_data->thread_nr;
555 cmdq->shift_pa = plat_data->shift;
556 cmdq->control_by_sw = plat_data->control_by_sw;
557 cmdq->gce_num = plat_data->gce_num;
558 cmdq->irq_mask = GENMASK(cmdq->thread_nr - 1, 0);
559 err = devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED,
560 "mtk_cmdq", cmdq);
561 if (err < 0) {
562 dev_err(dev, "failed to register ISR (%d)\n", err);
563 return err;
564 }
565
566 dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n",
567 dev, cmdq->base, cmdq->irq);
568
569 if (cmdq->gce_num > 1) {
570 for_each_child_of_node(phandle->parent, node) {
571 alias_id = of_alias_get_id(node, clk_name);
572 if (alias_id >= 0 && alias_id < cmdq->gce_num) {
573 cmdq->clocks[alias_id].id = clk_names[alias_id];
574 cmdq->clocks[alias_id].clk = of_clk_get(node, 0);
575 if (IS_ERR(cmdq->clocks[alias_id].clk)) {
576 of_node_put(node);
577 return dev_err_probe(dev,
578 PTR_ERR(cmdq->clocks[alias_id].clk),
579 "failed to get gce clk: %d\n",
580 alias_id);
581 }
582 }
583 }
584 } else {
585 cmdq->clocks[alias_id].id = clk_name;
586 cmdq->clocks[alias_id].clk = devm_clk_get(&pdev->dev, clk_name);
587 if (IS_ERR(cmdq->clocks[alias_id].clk)) {
588 return dev_err_probe(dev, PTR_ERR(cmdq->clocks[alias_id].clk),
589 "failed to get gce clk\n");
590 }
591 }
592
593 cmdq->mbox.dev = dev;
594 cmdq->mbox.chans = devm_kcalloc(dev, cmdq->thread_nr,
595 sizeof(*cmdq->mbox.chans), GFP_KERNEL);
596 if (!cmdq->mbox.chans)
597 return -ENOMEM;
598
599 cmdq->mbox.num_chans = cmdq->thread_nr;
600 cmdq->mbox.ops = &cmdq_mbox_chan_ops;
601 cmdq->mbox.of_xlate = cmdq_xlate;
602
603 /* make use of TXDONE_BY_ACK */
604 cmdq->mbox.txdone_irq = false;
605 cmdq->mbox.txdone_poll = false;
606
607 cmdq->thread = devm_kcalloc(dev, cmdq->thread_nr,
608 sizeof(*cmdq->thread), GFP_KERNEL);
609 if (!cmdq->thread)
610 return -ENOMEM;
611
612 for (i = 0; i < cmdq->thread_nr; i++) {
613 cmdq->thread[i].base = cmdq->base + CMDQ_THR_BASE +
614 CMDQ_THR_SIZE * i;
615 INIT_LIST_HEAD(&cmdq->thread[i].task_busy_list);
616 cmdq->mbox.chans[i].con_priv = (void *)&cmdq->thread[i];
617 }
618
619 err = devm_mbox_controller_register(dev, &cmdq->mbox);
620 if (err < 0) {
621 dev_err(dev, "failed to register mailbox: %d\n", err);
622 return err;
623 }
624
625 platform_set_drvdata(pdev, cmdq);
626
627 WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
628
629 cmdq_init(cmdq);
630
631 return 0;
632 }
633
634 static const struct dev_pm_ops cmdq_pm_ops = {
635 .suspend = cmdq_suspend,
636 .resume = cmdq_resume,
637 };
638
639 static const struct gce_plat gce_plat_v2 = {
640 .thread_nr = 16,
641 .shift = 0,
642 .control_by_sw = false,
643 .gce_num = 1
644 };
645
646 static const struct gce_plat gce_plat_v3 = {
647 .thread_nr = 24,
648 .shift = 0,
649 .control_by_sw = false,
650 .gce_num = 1
651 };
652
653 static const struct gce_plat gce_plat_v4 = {
654 .thread_nr = 24,
655 .shift = 3,
656 .control_by_sw = false,
657 .gce_num = 1
658 };
659
660 static const struct gce_plat gce_plat_v5 = {
661 .thread_nr = 24,
662 .shift = 3,
663 .control_by_sw = true,
664 .gce_num = 1
665 };
666
667 static const struct gce_plat gce_plat_v6 = {
668 .thread_nr = 24,
669 .shift = 3,
670 .control_by_sw = true,
671 .gce_num = 2
672 };
673
674 static const struct of_device_id cmdq_of_ids[] = {
675 {.compatible = "mediatek,mt8173-gce", .data = (void *)&gce_plat_v2},
676 {.compatible = "mediatek,mt8183-gce", .data = (void *)&gce_plat_v3},
677 {.compatible = "mediatek,mt6779-gce", .data = (void *)&gce_plat_v4},
678 {.compatible = "mediatek,mt8192-gce", .data = (void *)&gce_plat_v5},
679 {.compatible = "mediatek,mt8195-gce", .data = (void *)&gce_plat_v6},
680 {}
681 };
682
683 static struct platform_driver cmdq_drv = {
684 .probe = cmdq_probe,
685 .remove = cmdq_remove,
686 .driver = {
687 .name = "mtk_cmdq",
688 .pm = &cmdq_pm_ops,
689 .of_match_table = cmdq_of_ids,
690 }
691 };
692
cmdq_drv_init(void)693 static int __init cmdq_drv_init(void)
694 {
695 return platform_driver_register(&cmdq_drv);
696 }
697
cmdq_drv_exit(void)698 static void __exit cmdq_drv_exit(void)
699 {
700 platform_driver_unregister(&cmdq_drv);
701 }
702
703 subsys_initcall(cmdq_drv_init);
704 module_exit(cmdq_drv_exit);
705
706 MODULE_LICENSE("GPL v2");
707