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/pm_runtime.h>
17 #include <linux/mailbox_controller.h>
18 #include <linux/mailbox/mtk-cmdq-mailbox.h>
19 #include <linux/of.h>
20
21 #define CMDQ_MBOX_AUTOSUSPEND_DELAY_MS 100
22
23 #define CMDQ_OP_CODE_MASK (0xff << CMDQ_OP_CODE_SHIFT)
24 #define CMDQ_NUM_CMD(t) (t->cmd_buf_size / CMDQ_INST_SIZE)
25
26 #define CMDQ_CURR_IRQ_STATUS 0x10
27 #define CMDQ_SYNC_TOKEN_UPDATE 0x68
28 #define CMDQ_THR_SLOT_CYCLES 0x30
29 #define CMDQ_THR_BASE 0x100
30 #define CMDQ_THR_SIZE 0x80
31 #define CMDQ_THR_WARM_RESET 0x00
32 #define CMDQ_THR_ENABLE_TASK 0x04
33 #define CMDQ_THR_SUSPEND_TASK 0x08
34 #define CMDQ_THR_CURR_STATUS 0x0c
35 #define CMDQ_THR_IRQ_STATUS 0x10
36 #define CMDQ_THR_IRQ_ENABLE 0x14
37 #define CMDQ_THR_CURR_ADDR 0x20
38 #define CMDQ_THR_END_ADDR 0x24
39 #define CMDQ_THR_WAIT_TOKEN 0x30
40 #define CMDQ_THR_PRIORITY 0x40
41
42 #define GCE_GCTL_VALUE 0x48
43 #define GCE_CTRL_BY_SW GENMASK(2, 0)
44 #define GCE_DDR_EN GENMASK(18, 16)
45
46 #define CMDQ_THR_ACTIVE_SLOT_CYCLES 0x3200
47 #define CMDQ_THR_ENABLED 0x1
48 #define CMDQ_THR_DISABLED 0x0
49 #define CMDQ_THR_SUSPEND 0x1
50 #define CMDQ_THR_RESUME 0x0
51 #define CMDQ_THR_STATUS_SUSPENDED BIT(1)
52 #define CMDQ_THR_DO_WARM_RESET BIT(0)
53 #define CMDQ_THR_IRQ_DONE 0x1
54 #define CMDQ_THR_IRQ_ERROR 0x12
55 #define CMDQ_THR_IRQ_EN (CMDQ_THR_IRQ_ERROR | CMDQ_THR_IRQ_DONE)
56 #define CMDQ_THR_IS_WAITING BIT(31)
57
58 #define CMDQ_JUMP_BY_OFFSET 0x10000000
59 #define CMDQ_JUMP_BY_PA 0x10000001
60
61 struct cmdq_thread {
62 struct mbox_chan *chan;
63 void __iomem *base;
64 struct list_head task_busy_list;
65 u32 priority;
66 };
67
68 struct cmdq_task {
69 struct cmdq *cmdq;
70 struct list_head list_entry;
71 dma_addr_t pa_base;
72 struct cmdq_thread *thread;
73 struct cmdq_pkt *pkt; /* the packet sent from mailbox client */
74 };
75
76 struct cmdq {
77 struct mbox_controller mbox;
78 void __iomem *base;
79 int irq;
80 u32 irq_mask;
81 const struct gce_plat *pdata;
82 struct cmdq_thread *thread;
83 struct clk_bulk_data *clocks;
84 bool suspended;
85 };
86
87 struct gce_plat {
88 u32 thread_nr;
89 u8 shift;
90 bool control_by_sw;
91 bool sw_ddr_en;
92 u32 gce_num;
93 };
94
cmdq_convert_gce_addr(dma_addr_t addr,const struct gce_plat * pdata)95 static inline u32 cmdq_convert_gce_addr(dma_addr_t addr, const struct gce_plat *pdata)
96 {
97 /* Convert DMA addr (PA or IOVA) to GCE readable addr */
98 return addr >> pdata->shift;
99 }
100
cmdq_revert_gce_addr(u32 addr,const struct gce_plat * pdata)101 static inline dma_addr_t cmdq_revert_gce_addr(u32 addr, const struct gce_plat *pdata)
102 {
103 /* Revert GCE readable addr to DMA addr (PA or IOVA) */
104 return (dma_addr_t)addr << pdata->shift;
105 }
106
cmdq_get_shift_pa(struct mbox_chan * chan)107 u8 cmdq_get_shift_pa(struct mbox_chan *chan)
108 {
109 struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
110
111 return cmdq->pdata->shift;
112 }
113 EXPORT_SYMBOL(cmdq_get_shift_pa);
114
cmdq_gctl_value_toggle(struct cmdq * cmdq,bool ddr_enable)115 static void cmdq_gctl_value_toggle(struct cmdq *cmdq, bool ddr_enable)
116 {
117 u32 val = cmdq->pdata->control_by_sw ? GCE_CTRL_BY_SW : 0;
118
119 if (!cmdq->pdata->control_by_sw && !cmdq->pdata->sw_ddr_en)
120 return;
121
122 if (cmdq->pdata->sw_ddr_en && ddr_enable)
123 val |= GCE_DDR_EN;
124
125 writel(val, cmdq->base + GCE_GCTL_VALUE);
126 }
127
cmdq_thread_suspend(struct cmdq * cmdq,struct cmdq_thread * thread)128 static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
129 {
130 u32 status;
131
132 writel(CMDQ_THR_SUSPEND, thread->base + CMDQ_THR_SUSPEND_TASK);
133
134 /* If already disabled, treat as suspended successful. */
135 if (!(readl(thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
136 return 0;
137
138 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_CURR_STATUS,
139 status, status & CMDQ_THR_STATUS_SUSPENDED, 0, 10)) {
140 dev_err(cmdq->mbox.dev, "suspend GCE thread 0x%x failed\n",
141 (u32)(thread->base - cmdq->base));
142 return -EFAULT;
143 }
144
145 return 0;
146 }
147
cmdq_thread_resume(struct cmdq_thread * thread)148 static void cmdq_thread_resume(struct cmdq_thread *thread)
149 {
150 writel(CMDQ_THR_RESUME, thread->base + CMDQ_THR_SUSPEND_TASK);
151 }
152
cmdq_init(struct cmdq * cmdq)153 static void cmdq_init(struct cmdq *cmdq)
154 {
155 int i;
156
157 WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
158
159 cmdq_gctl_value_toggle(cmdq, true);
160
161 writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base + CMDQ_THR_SLOT_CYCLES);
162 for (i = 0; i <= CMDQ_MAX_EVENT; i++)
163 writel(i, cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);
164 clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
165 }
166
cmdq_thread_reset(struct cmdq * cmdq,struct cmdq_thread * thread)167 static int cmdq_thread_reset(struct cmdq *cmdq, struct cmdq_thread *thread)
168 {
169 u32 warm_reset;
170
171 writel(CMDQ_THR_DO_WARM_RESET, thread->base + CMDQ_THR_WARM_RESET);
172 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_WARM_RESET,
173 warm_reset, !(warm_reset & CMDQ_THR_DO_WARM_RESET),
174 0, 10)) {
175 dev_err(cmdq->mbox.dev, "reset GCE thread 0x%x failed\n",
176 (u32)(thread->base - cmdq->base));
177 return -EFAULT;
178 }
179
180 return 0;
181 }
182
cmdq_thread_disable(struct cmdq * cmdq,struct cmdq_thread * thread)183 static void cmdq_thread_disable(struct cmdq *cmdq, struct cmdq_thread *thread)
184 {
185 cmdq_thread_reset(cmdq, thread);
186 writel(CMDQ_THR_DISABLED, thread->base + CMDQ_THR_ENABLE_TASK);
187 }
188
189 /* notify GCE to re-fetch commands by setting GCE thread PC */
cmdq_thread_invalidate_fetched_data(struct cmdq_thread * thread)190 static void cmdq_thread_invalidate_fetched_data(struct cmdq_thread *thread)
191 {
192 writel(readl(thread->base + CMDQ_THR_CURR_ADDR),
193 thread->base + CMDQ_THR_CURR_ADDR);
194 }
195
cmdq_task_insert_into_thread(struct cmdq_task * task)196 static void cmdq_task_insert_into_thread(struct cmdq_task *task)
197 {
198 struct device *dev = task->cmdq->mbox.dev;
199 struct cmdq_thread *thread = task->thread;
200 struct cmdq_task *prev_task = list_last_entry(
201 &thread->task_busy_list, typeof(*task), list_entry);
202 u64 *prev_task_base = prev_task->pkt->va_base;
203 u32 gce_addr = cmdq_convert_gce_addr(task->pa_base, task->cmdq->pdata);
204
205 /* let previous task jump to this task */
206 dma_sync_single_for_cpu(dev, prev_task->pa_base,
207 prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
208 prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] = (u64)CMDQ_JUMP_BY_PA << 32 | gce_addr;
209 dma_sync_single_for_device(dev, prev_task->pa_base,
210 prev_task->pkt->cmd_buf_size, DMA_TO_DEVICE);
211
212 cmdq_thread_invalidate_fetched_data(thread);
213 }
214
cmdq_thread_is_in_wfe(struct cmdq_thread * thread)215 static bool cmdq_thread_is_in_wfe(struct cmdq_thread *thread)
216 {
217 return readl(thread->base + CMDQ_THR_WAIT_TOKEN) & CMDQ_THR_IS_WAITING;
218 }
219
cmdq_task_exec_done(struct cmdq_task * task,int sta)220 static void cmdq_task_exec_done(struct cmdq_task *task, int sta)
221 {
222 struct cmdq_cb_data data;
223
224 data.sta = sta;
225 data.pkt = task->pkt;
226 mbox_chan_received_data(task->thread->chan, &data);
227
228 list_del(&task->list_entry);
229 }
230
cmdq_task_handle_error(struct cmdq_task * task)231 static void cmdq_task_handle_error(struct cmdq_task *task)
232 {
233 struct cmdq_thread *thread = task->thread;
234 struct cmdq_task *next_task;
235 struct cmdq *cmdq = task->cmdq;
236
237 dev_err(cmdq->mbox.dev, "task 0x%p error\n", task);
238 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
239 next_task = list_first_entry_or_null(&thread->task_busy_list,
240 struct cmdq_task, list_entry);
241 if (next_task)
242 writel(next_task->pa_base >> cmdq->pdata->shift,
243 thread->base + CMDQ_THR_CURR_ADDR);
244 cmdq_thread_resume(thread);
245 }
246
cmdq_thread_irq_handler(struct cmdq * cmdq,struct cmdq_thread * thread)247 static void cmdq_thread_irq_handler(struct cmdq *cmdq,
248 struct cmdq_thread *thread)
249 {
250 struct cmdq_task *task, *tmp, *curr_task = NULL;
251 u32 irq_flag, gce_addr;
252 dma_addr_t curr_pa, task_end_pa;
253 bool err;
254
255 irq_flag = readl(thread->base + CMDQ_THR_IRQ_STATUS);
256 writel(~irq_flag, thread->base + CMDQ_THR_IRQ_STATUS);
257
258 /*
259 * When ISR call this function, another CPU core could run
260 * "release task" right before we acquire the spin lock, and thus
261 * reset / disable this GCE thread, so we need to check the enable
262 * bit of this GCE thread.
263 */
264 if (!(readl(thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
265 return;
266
267 if (irq_flag & CMDQ_THR_IRQ_ERROR)
268 err = true;
269 else if (irq_flag & CMDQ_THR_IRQ_DONE)
270 err = false;
271 else
272 return;
273
274 gce_addr = readl(thread->base + CMDQ_THR_CURR_ADDR);
275 curr_pa = cmdq_revert_gce_addr(gce_addr, cmdq->pdata);
276
277 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
278 list_entry) {
279 task_end_pa = task->pa_base + task->pkt->cmd_buf_size;
280 if (curr_pa >= task->pa_base && curr_pa < task_end_pa)
281 curr_task = task;
282
283 if (!curr_task || curr_pa == task_end_pa - CMDQ_INST_SIZE) {
284 cmdq_task_exec_done(task, 0);
285 kfree(task);
286 } else if (err) {
287 cmdq_task_exec_done(task, -ENOEXEC);
288 cmdq_task_handle_error(curr_task);
289 kfree(task);
290 }
291
292 if (curr_task)
293 break;
294 }
295
296 if (list_empty(&thread->task_busy_list))
297 cmdq_thread_disable(cmdq, thread);
298 }
299
cmdq_irq_handler(int irq,void * dev)300 static irqreturn_t cmdq_irq_handler(int irq, void *dev)
301 {
302 struct cmdq *cmdq = dev;
303 unsigned long irq_status, flags = 0L;
304 int bit;
305
306 irq_status = readl(cmdq->base + CMDQ_CURR_IRQ_STATUS) & cmdq->irq_mask;
307 if (!(irq_status ^ cmdq->irq_mask))
308 return IRQ_NONE;
309
310 for_each_clear_bit(bit, &irq_status, cmdq->pdata->thread_nr) {
311 struct cmdq_thread *thread = &cmdq->thread[bit];
312
313 spin_lock_irqsave(&thread->chan->lock, flags);
314 cmdq_thread_irq_handler(cmdq, thread);
315 spin_unlock_irqrestore(&thread->chan->lock, flags);
316 }
317
318 pm_runtime_mark_last_busy(cmdq->mbox.dev);
319
320 return IRQ_HANDLED;
321 }
322
cmdq_runtime_resume(struct device * dev)323 static int cmdq_runtime_resume(struct device *dev)
324 {
325 struct cmdq *cmdq = dev_get_drvdata(dev);
326 int ret;
327
328 ret = clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks);
329 if (ret)
330 return ret;
331
332 cmdq_gctl_value_toggle(cmdq, true);
333 return 0;
334 }
335
cmdq_runtime_suspend(struct device * dev)336 static int cmdq_runtime_suspend(struct device *dev)
337 {
338 struct cmdq *cmdq = dev_get_drvdata(dev);
339
340 cmdq_gctl_value_toggle(cmdq, false);
341 clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
342 return 0;
343 }
344
cmdq_suspend(struct device * dev)345 static int cmdq_suspend(struct device *dev)
346 {
347 struct cmdq *cmdq = dev_get_drvdata(dev);
348 struct cmdq_thread *thread;
349 int i;
350 bool task_running = false;
351
352 cmdq->suspended = true;
353
354 for (i = 0; i < cmdq->pdata->thread_nr; i++) {
355 thread = &cmdq->thread[i];
356 if (!list_empty(&thread->task_busy_list)) {
357 task_running = true;
358 break;
359 }
360 }
361
362 if (task_running)
363 dev_warn(dev, "exist running task(s) in suspend\n");
364
365 return pm_runtime_force_suspend(dev);
366 }
367
cmdq_resume(struct device * dev)368 static int cmdq_resume(struct device *dev)
369 {
370 struct cmdq *cmdq = dev_get_drvdata(dev);
371
372 WARN_ON(pm_runtime_force_resume(dev));
373 cmdq->suspended = false;
374
375 return 0;
376 }
377
cmdq_remove(struct platform_device * pdev)378 static void cmdq_remove(struct platform_device *pdev)
379 {
380 struct cmdq *cmdq = platform_get_drvdata(pdev);
381
382 if (!IS_ENABLED(CONFIG_PM))
383 cmdq_runtime_suspend(&pdev->dev);
384
385 clk_bulk_unprepare(cmdq->pdata->gce_num, cmdq->clocks);
386 }
387
cmdq_mbox_send_data(struct mbox_chan * chan,void * data)388 static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
389 {
390 struct cmdq_pkt *pkt = (struct cmdq_pkt *)data;
391 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
392 struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
393 struct cmdq_task *task;
394 u32 gce_addr;
395 dma_addr_t curr_pa, end_pa;
396
397 /* Client should not flush new tasks if suspended. */
398 WARN_ON(cmdq->suspended);
399
400 task = kzalloc(sizeof(*task), GFP_ATOMIC);
401 if (!task)
402 return -ENOMEM;
403
404 task->cmdq = cmdq;
405 INIT_LIST_HEAD(&task->list_entry);
406 task->pa_base = pkt->pa_base;
407 task->thread = thread;
408 task->pkt = pkt;
409
410 if (list_empty(&thread->task_busy_list)) {
411 /*
412 * The thread reset will clear thread related register to 0,
413 * including pc, end, priority, irq, suspend and enable. Thus
414 * set CMDQ_THR_ENABLED to CMDQ_THR_ENABLE_TASK will enable
415 * thread and make it running.
416 */
417 WARN_ON(cmdq_thread_reset(cmdq, thread) < 0);
418
419 gce_addr = cmdq_convert_gce_addr(task->pa_base, cmdq->pdata);
420 writel(gce_addr, thread->base + CMDQ_THR_CURR_ADDR);
421 gce_addr = cmdq_convert_gce_addr(task->pa_base + pkt->cmd_buf_size, cmdq->pdata);
422 writel(gce_addr, thread->base + CMDQ_THR_END_ADDR);
423
424 writel(thread->priority, thread->base + CMDQ_THR_PRIORITY);
425 writel(CMDQ_THR_IRQ_EN, thread->base + CMDQ_THR_IRQ_ENABLE);
426 writel(CMDQ_THR_ENABLED, thread->base + CMDQ_THR_ENABLE_TASK);
427 } else {
428 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
429 gce_addr = readl(thread->base + CMDQ_THR_CURR_ADDR);
430 curr_pa = cmdq_revert_gce_addr(gce_addr, cmdq->pdata);
431 gce_addr = readl(thread->base + CMDQ_THR_END_ADDR);
432 end_pa = cmdq_revert_gce_addr(gce_addr, cmdq->pdata);
433 /* check boundary */
434 if (curr_pa == end_pa - CMDQ_INST_SIZE ||
435 curr_pa == end_pa) {
436 /* set to this task directly */
437 writel(task->pa_base >> cmdq->pdata->shift,
438 thread->base + CMDQ_THR_CURR_ADDR);
439 } else {
440 cmdq_task_insert_into_thread(task);
441 smp_mb(); /* modify jump before enable thread */
442 }
443 writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->pdata->shift,
444 thread->base + CMDQ_THR_END_ADDR);
445 cmdq_thread_resume(thread);
446 }
447 list_move_tail(&task->list_entry, &thread->task_busy_list);
448
449 return 0;
450 }
451
cmdq_mbox_startup(struct mbox_chan * chan)452 static int cmdq_mbox_startup(struct mbox_chan *chan)
453 {
454 return 0;
455 }
456
cmdq_mbox_shutdown(struct mbox_chan * chan)457 static void cmdq_mbox_shutdown(struct mbox_chan *chan)
458 {
459 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
460 struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
461 struct cmdq_task *task, *tmp;
462 unsigned long flags;
463
464 WARN_ON(pm_runtime_get_sync(cmdq->mbox.dev) < 0);
465
466 spin_lock_irqsave(&thread->chan->lock, flags);
467 if (list_empty(&thread->task_busy_list))
468 goto done;
469
470 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
471
472 /* make sure executed tasks have success callback */
473 cmdq_thread_irq_handler(cmdq, thread);
474 if (list_empty(&thread->task_busy_list))
475 goto done;
476
477 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
478 list_entry) {
479 cmdq_task_exec_done(task, -ECONNABORTED);
480 kfree(task);
481 }
482
483 cmdq_thread_disable(cmdq, thread);
484
485 done:
486 /*
487 * The thread->task_busy_list empty means thread already disable. The
488 * cmdq_mbox_send_data() always reset thread which clear disable and
489 * suspend statue when first pkt send to channel, so there is no need
490 * to do any operation here, only unlock and leave.
491 */
492 spin_unlock_irqrestore(&thread->chan->lock, flags);
493
494 pm_runtime_mark_last_busy(cmdq->mbox.dev);
495 pm_runtime_put_autosuspend(cmdq->mbox.dev);
496 }
497
cmdq_mbox_flush(struct mbox_chan * chan,unsigned long timeout)498 static int cmdq_mbox_flush(struct mbox_chan *chan, unsigned long timeout)
499 {
500 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
501 struct cmdq_cb_data data;
502 struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
503 struct cmdq_task *task, *tmp;
504 unsigned long flags;
505 u32 enable;
506 int ret;
507
508 ret = pm_runtime_get_sync(cmdq->mbox.dev);
509 if (ret < 0)
510 return ret;
511
512 spin_lock_irqsave(&thread->chan->lock, flags);
513 if (list_empty(&thread->task_busy_list))
514 goto out;
515
516 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
517 if (!cmdq_thread_is_in_wfe(thread))
518 goto wait;
519
520 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
521 list_entry) {
522 data.sta = -ECONNABORTED;
523 data.pkt = task->pkt;
524 mbox_chan_received_data(task->thread->chan, &data);
525 list_del(&task->list_entry);
526 kfree(task);
527 }
528
529 cmdq_thread_resume(thread);
530 cmdq_thread_disable(cmdq, thread);
531
532 out:
533 spin_unlock_irqrestore(&thread->chan->lock, flags);
534 pm_runtime_mark_last_busy(cmdq->mbox.dev);
535 pm_runtime_put_autosuspend(cmdq->mbox.dev);
536
537 return 0;
538
539 wait:
540 cmdq_thread_resume(thread);
541 spin_unlock_irqrestore(&thread->chan->lock, flags);
542 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_ENABLE_TASK,
543 enable, enable == 0, 1, timeout)) {
544 dev_err(cmdq->mbox.dev, "Fail to wait GCE thread 0x%x done\n",
545 (u32)(thread->base - cmdq->base));
546
547 return -EFAULT;
548 }
549 pm_runtime_mark_last_busy(cmdq->mbox.dev);
550 pm_runtime_put_autosuspend(cmdq->mbox.dev);
551 return 0;
552 }
553
554 static const struct mbox_chan_ops cmdq_mbox_chan_ops = {
555 .send_data = cmdq_mbox_send_data,
556 .startup = cmdq_mbox_startup,
557 .shutdown = cmdq_mbox_shutdown,
558 .flush = cmdq_mbox_flush,
559 };
560
cmdq_xlate(struct mbox_controller * mbox,const struct of_phandle_args * sp)561 static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,
562 const struct of_phandle_args *sp)
563 {
564 int ind = sp->args[0];
565 struct cmdq_thread *thread;
566
567 if (ind >= mbox->num_chans)
568 return ERR_PTR(-EINVAL);
569
570 thread = (struct cmdq_thread *)mbox->chans[ind].con_priv;
571 thread->priority = sp->args[1];
572 thread->chan = &mbox->chans[ind];
573
574 return &mbox->chans[ind];
575 }
576
cmdq_get_clocks(struct device * dev,struct cmdq * cmdq)577 static int cmdq_get_clocks(struct device *dev, struct cmdq *cmdq)
578 {
579 static const char * const gce_name = "gce";
580 struct device_node *node, *parent = dev->of_node->parent;
581 struct clk_bulk_data *clks;
582
583 cmdq->clocks = devm_kcalloc(dev, cmdq->pdata->gce_num,
584 sizeof(*cmdq->clocks), GFP_KERNEL);
585 if (!cmdq->clocks)
586 return -ENOMEM;
587
588 if (cmdq->pdata->gce_num == 1) {
589 clks = &cmdq->clocks[0];
590
591 clks->id = gce_name;
592 clks->clk = devm_clk_get(dev, NULL);
593 if (IS_ERR(clks->clk))
594 return dev_err_probe(dev, PTR_ERR(clks->clk),
595 "failed to get gce clock\n");
596
597 return 0;
598 }
599
600 /*
601 * If there is more than one GCE, get the clocks for the others too,
602 * as the clock of the main GCE must be enabled for additional IPs
603 * to be reachable.
604 */
605 for_each_child_of_node(parent, node) {
606 int alias_id = of_alias_get_id(node, gce_name);
607
608 if (alias_id < 0 || alias_id >= cmdq->pdata->gce_num)
609 continue;
610
611 clks = &cmdq->clocks[alias_id];
612
613 clks->id = devm_kasprintf(dev, GFP_KERNEL, "gce%d", alias_id);
614 if (!clks->id) {
615 of_node_put(node);
616 return -ENOMEM;
617 }
618
619 clks->clk = of_clk_get(node, 0);
620 if (IS_ERR(clks->clk)) {
621 of_node_put(node);
622 return dev_err_probe(dev, PTR_ERR(clks->clk),
623 "failed to get gce%d clock\n", alias_id);
624 }
625 }
626
627 return 0;
628 }
629
cmdq_probe(struct platform_device * pdev)630 static int cmdq_probe(struct platform_device *pdev)
631 {
632 struct device *dev = &pdev->dev;
633 struct cmdq *cmdq;
634 int err, i;
635
636 cmdq = devm_kzalloc(dev, sizeof(*cmdq), GFP_KERNEL);
637 if (!cmdq)
638 return -ENOMEM;
639
640 cmdq->base = devm_platform_ioremap_resource(pdev, 0);
641 if (IS_ERR(cmdq->base))
642 return PTR_ERR(cmdq->base);
643
644 cmdq->irq = platform_get_irq(pdev, 0);
645 if (cmdq->irq < 0)
646 return cmdq->irq;
647
648 cmdq->pdata = device_get_match_data(dev);
649 if (!cmdq->pdata) {
650 dev_err(dev, "failed to get match data\n");
651 return -EINVAL;
652 }
653
654 cmdq->irq_mask = GENMASK(cmdq->pdata->thread_nr - 1, 0);
655
656 dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n",
657 dev, cmdq->base, cmdq->irq);
658
659 err = cmdq_get_clocks(dev, cmdq);
660 if (err)
661 return err;
662
663 dma_set_coherent_mask(dev,
664 DMA_BIT_MASK(sizeof(u32) * BITS_PER_BYTE + cmdq->pdata->shift));
665
666 cmdq->mbox.dev = dev;
667 cmdq->mbox.chans = devm_kcalloc(dev, cmdq->pdata->thread_nr,
668 sizeof(*cmdq->mbox.chans), GFP_KERNEL);
669 if (!cmdq->mbox.chans)
670 return -ENOMEM;
671
672 cmdq->mbox.num_chans = cmdq->pdata->thread_nr;
673 cmdq->mbox.ops = &cmdq_mbox_chan_ops;
674 cmdq->mbox.of_xlate = cmdq_xlate;
675
676 /* make use of TXDONE_BY_ACK */
677 cmdq->mbox.txdone_irq = false;
678 cmdq->mbox.txdone_poll = false;
679
680 cmdq->thread = devm_kcalloc(dev, cmdq->pdata->thread_nr,
681 sizeof(*cmdq->thread), GFP_KERNEL);
682 if (!cmdq->thread)
683 return -ENOMEM;
684
685 for (i = 0; i < cmdq->pdata->thread_nr; i++) {
686 cmdq->thread[i].base = cmdq->base + CMDQ_THR_BASE +
687 CMDQ_THR_SIZE * i;
688 INIT_LIST_HEAD(&cmdq->thread[i].task_busy_list);
689 cmdq->mbox.chans[i].con_priv = (void *)&cmdq->thread[i];
690 }
691
692 platform_set_drvdata(pdev, cmdq);
693
694 WARN_ON(clk_bulk_prepare(cmdq->pdata->gce_num, cmdq->clocks));
695
696 cmdq_init(cmdq);
697
698 err = devm_request_irq(dev, cmdq->irq, cmdq_irq_handler, IRQF_SHARED,
699 "mtk_cmdq", cmdq);
700 if (err < 0) {
701 dev_err(dev, "failed to register ISR (%d)\n", err);
702 return err;
703 }
704
705 /* If Runtime PM is not available enable the clocks now. */
706 if (!IS_ENABLED(CONFIG_PM)) {
707 err = cmdq_runtime_resume(dev);
708 if (err)
709 return err;
710 }
711
712 err = devm_pm_runtime_enable(dev);
713 if (err)
714 return err;
715
716 pm_runtime_set_autosuspend_delay(dev, CMDQ_MBOX_AUTOSUSPEND_DELAY_MS);
717 pm_runtime_use_autosuspend(dev);
718
719 err = devm_mbox_controller_register(dev, &cmdq->mbox);
720 if (err < 0) {
721 dev_err(dev, "failed to register mailbox: %d\n", err);
722 return err;
723 }
724
725 return 0;
726 }
727
728 static const struct dev_pm_ops cmdq_pm_ops = {
729 .suspend = cmdq_suspend,
730 .resume = cmdq_resume,
731 SET_RUNTIME_PM_OPS(cmdq_runtime_suspend,
732 cmdq_runtime_resume, NULL)
733 };
734
735 static const struct gce_plat gce_plat_mt6779 = {
736 .thread_nr = 24,
737 .shift = 3,
738 .control_by_sw = false,
739 .gce_num = 1
740 };
741
742 static const struct gce_plat gce_plat_mt8173 = {
743 .thread_nr = 16,
744 .shift = 0,
745 .control_by_sw = false,
746 .gce_num = 1
747 };
748
749 static const struct gce_plat gce_plat_mt8183 = {
750 .thread_nr = 24,
751 .shift = 0,
752 .control_by_sw = false,
753 .gce_num = 1
754 };
755
756 static const struct gce_plat gce_plat_mt8186 = {
757 .thread_nr = 24,
758 .shift = 3,
759 .control_by_sw = true,
760 .sw_ddr_en = true,
761 .gce_num = 1
762 };
763
764 static const struct gce_plat gce_plat_mt8188 = {
765 .thread_nr = 32,
766 .shift = 3,
767 .control_by_sw = true,
768 .gce_num = 2
769 };
770
771 static const struct gce_plat gce_plat_mt8192 = {
772 .thread_nr = 24,
773 .shift = 3,
774 .control_by_sw = true,
775 .gce_num = 1
776 };
777
778 static const struct gce_plat gce_plat_mt8195 = {
779 .thread_nr = 24,
780 .shift = 3,
781 .control_by_sw = true,
782 .gce_num = 2
783 };
784
785 static const struct of_device_id cmdq_of_ids[] = {
786 {.compatible = "mediatek,mt6779-gce", .data = (void *)&gce_plat_mt6779},
787 {.compatible = "mediatek,mt8173-gce", .data = (void *)&gce_plat_mt8173},
788 {.compatible = "mediatek,mt8183-gce", .data = (void *)&gce_plat_mt8183},
789 {.compatible = "mediatek,mt8186-gce", .data = (void *)&gce_plat_mt8186},
790 {.compatible = "mediatek,mt8188-gce", .data = (void *)&gce_plat_mt8188},
791 {.compatible = "mediatek,mt8192-gce", .data = (void *)&gce_plat_mt8192},
792 {.compatible = "mediatek,mt8195-gce", .data = (void *)&gce_plat_mt8195},
793 {}
794 };
795 MODULE_DEVICE_TABLE(of, cmdq_of_ids);
796
797 static struct platform_driver cmdq_drv = {
798 .probe = cmdq_probe,
799 .remove = cmdq_remove,
800 .driver = {
801 .name = "mtk_cmdq",
802 .pm = &cmdq_pm_ops,
803 .of_match_table = cmdq_of_ids,
804 }
805 };
806
cmdq_drv_init(void)807 static int __init cmdq_drv_init(void)
808 {
809 return platform_driver_register(&cmdq_drv);
810 }
811
cmdq_drv_exit(void)812 static void __exit cmdq_drv_exit(void)
813 {
814 platform_driver_unregister(&cmdq_drv);
815 }
816
817 subsys_initcall(cmdq_drv_init);
818 module_exit(cmdq_drv_exit);
819
820 MODULE_DESCRIPTION("Mediatek Command Queue(CMDQ) Mailbox driver");
821 MODULE_LICENSE("GPL v2");
822