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#define CMDQ_GCE_NUM_MAX (2)
26
27#define CMDQ_CURR_IRQ_STATUS 0x10
28#define CMDQ_SYNC_TOKEN_UPDATE 0x68
29#define CMDQ_THR_SLOT_CYCLES 0x30
30#define CMDQ_THR_BASE 0x100
31#define CMDQ_THR_SIZE 0x80
32#define CMDQ_THR_WARM_RESET 0x00
33#define CMDQ_THR_ENABLE_TASK 0x04
34#define CMDQ_THR_SUSPEND_TASK 0x08
35#define CMDQ_THR_CURR_STATUS 0x0c
36#define CMDQ_THR_IRQ_STATUS 0x10
37#define CMDQ_THR_IRQ_ENABLE 0x14
38#define CMDQ_THR_CURR_ADDR 0x20
39#define CMDQ_THR_END_ADDR 0x24
40#define CMDQ_THR_WAIT_TOKEN 0x30
41#define CMDQ_THR_PRIORITY 0x40
42
43#define GCE_GCTL_VALUE 0x48
44#define GCE_CTRL_BY_SW GENMASK(2, 0)
45#define GCE_DDR_EN GENMASK(18, 16)
46
47#define CMDQ_THR_ACTIVE_SLOT_CYCLES 0x3200
48#define CMDQ_THR_ENABLED 0x1
49#define CMDQ_THR_DISABLED 0x0
50#define CMDQ_THR_SUSPEND 0x1
51#define CMDQ_THR_RESUME 0x0
52#define CMDQ_THR_STATUS_SUSPENDED BIT(1)
53#define CMDQ_THR_DO_WARM_RESET BIT(0)
54#define CMDQ_THR_IRQ_DONE 0x1
55#define CMDQ_THR_IRQ_ERROR 0x12
56#define CMDQ_THR_IRQ_EN (CMDQ_THR_IRQ_ERROR | CMDQ_THR_IRQ_DONE)
57#define CMDQ_THR_IS_WAITING BIT(31)
58
59#define CMDQ_JUMP_BY_OFFSET 0x10000000
60#define CMDQ_JUMP_BY_PA 0x10000001
61
62struct cmdq_thread {
63 struct mbox_chan *chan;
64 void __iomem *base;
65 struct list_head task_busy_list;
66 u32 priority;
67};
68
69struct cmdq_task {
70 struct cmdq *cmdq;
71 struct list_head list_entry;
72 dma_addr_t pa_base;
73 struct cmdq_thread *thread;
74 struct cmdq_pkt *pkt; /* the packet sent from mailbox client */
75};
76
77struct cmdq {
78 struct mbox_controller mbox;
79 void __iomem *base;
80 int irq;
81 u32 irq_mask;
82 const struct gce_plat *pdata;
83 struct cmdq_thread *thread;
84 struct clk_bulk_data clocks[CMDQ_GCE_NUM_MAX];
85 bool suspended;
86};
87
88struct gce_plat {
89 u32 thread_nr;
90 u8 shift;
91 bool control_by_sw;
92 bool sw_ddr_en;
93 u32 gce_num;
94};
95
96static void cmdq_sw_ddr_enable(struct cmdq *cmdq, bool enable)
97{
98 WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
99
100 if (enable)
101 writel(GCE_DDR_EN | GCE_CTRL_BY_SW, addr: cmdq->base + GCE_GCTL_VALUE);
102 else
103 writel(GCE_CTRL_BY_SW, addr: cmdq->base + GCE_GCTL_VALUE);
104
105 clk_bulk_disable(num_clks: cmdq->pdata->gce_num, clks: cmdq->clocks);
106}
107
108u8 cmdq_get_shift_pa(struct mbox_chan *chan)
109{
110 struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
111
112 return cmdq->pdata->shift;
113}
114EXPORT_SYMBOL(cmdq_get_shift_pa);
115
116static int cmdq_thread_suspend(struct cmdq *cmdq, struct cmdq_thread *thread)
117{
118 u32 status;
119
120 writel(CMDQ_THR_SUSPEND, addr: thread->base + CMDQ_THR_SUSPEND_TASK);
121
122 /* If already disabled, treat as suspended successful. */
123 if (!(readl(addr: thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
124 return 0;
125
126 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_CURR_STATUS,
127 status, status & CMDQ_THR_STATUS_SUSPENDED, 0, 10)) {
128 dev_err(cmdq->mbox.dev, "suspend GCE thread 0x%x failed\n",
129 (u32)(thread->base - cmdq->base));
130 return -EFAULT;
131 }
132
133 return 0;
134}
135
136static void cmdq_thread_resume(struct cmdq_thread *thread)
137{
138 writel(CMDQ_THR_RESUME, addr: thread->base + CMDQ_THR_SUSPEND_TASK);
139}
140
141static void cmdq_init(struct cmdq *cmdq)
142{
143 int i;
144 u32 gctl_regval = 0;
145
146 WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
147 if (cmdq->pdata->control_by_sw)
148 gctl_regval = GCE_CTRL_BY_SW;
149 if (cmdq->pdata->sw_ddr_en)
150 gctl_regval |= GCE_DDR_EN;
151
152 if (gctl_regval)
153 writel(val: gctl_regval, addr: cmdq->base + GCE_GCTL_VALUE);
154
155 writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, addr: cmdq->base + CMDQ_THR_SLOT_CYCLES);
156 for (i = 0; i <= CMDQ_MAX_EVENT; i++)
157 writel(val: i, addr: cmdq->base + CMDQ_SYNC_TOKEN_UPDATE);
158 clk_bulk_disable(num_clks: cmdq->pdata->gce_num, clks: cmdq->clocks);
159}
160
161static int cmdq_thread_reset(struct cmdq *cmdq, struct cmdq_thread *thread)
162{
163 u32 warm_reset;
164
165 writel(CMDQ_THR_DO_WARM_RESET, addr: thread->base + CMDQ_THR_WARM_RESET);
166 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_WARM_RESET,
167 warm_reset, !(warm_reset & CMDQ_THR_DO_WARM_RESET),
168 0, 10)) {
169 dev_err(cmdq->mbox.dev, "reset GCE thread 0x%x failed\n",
170 (u32)(thread->base - cmdq->base));
171 return -EFAULT;
172 }
173
174 return 0;
175}
176
177static void cmdq_thread_disable(struct cmdq *cmdq, struct cmdq_thread *thread)
178{
179 cmdq_thread_reset(cmdq, thread);
180 writel(CMDQ_THR_DISABLED, addr: thread->base + CMDQ_THR_ENABLE_TASK);
181}
182
183/* notify GCE to re-fetch commands by setting GCE thread PC */
184static void cmdq_thread_invalidate_fetched_data(struct cmdq_thread *thread)
185{
186 writel(readl(addr: thread->base + CMDQ_THR_CURR_ADDR),
187 addr: thread->base + CMDQ_THR_CURR_ADDR);
188}
189
190static void cmdq_task_insert_into_thread(struct cmdq_task *task)
191{
192 struct device *dev = task->cmdq->mbox.dev;
193 struct cmdq_thread *thread = task->thread;
194 struct cmdq_task *prev_task = list_last_entry(
195 &thread->task_busy_list, typeof(*task), list_entry);
196 u64 *prev_task_base = prev_task->pkt->va_base;
197
198 /* let previous task jump to this task */
199 dma_sync_single_for_cpu(dev, addr: prev_task->pa_base,
200 size: prev_task->pkt->cmd_buf_size, dir: DMA_TO_DEVICE);
201 prev_task_base[CMDQ_NUM_CMD(prev_task->pkt) - 1] =
202 (u64)CMDQ_JUMP_BY_PA << 32 |
203 (task->pa_base >> task->cmdq->pdata->shift);
204 dma_sync_single_for_device(dev, addr: prev_task->pa_base,
205 size: prev_task->pkt->cmd_buf_size, dir: DMA_TO_DEVICE);
206
207 cmdq_thread_invalidate_fetched_data(thread);
208}
209
210static bool cmdq_thread_is_in_wfe(struct cmdq_thread *thread)
211{
212 return readl(addr: thread->base + CMDQ_THR_WAIT_TOKEN) & CMDQ_THR_IS_WAITING;
213}
214
215static void cmdq_task_exec_done(struct cmdq_task *task, int sta)
216{
217 struct cmdq_cb_data data;
218
219 data.sta = sta;
220 data.pkt = task->pkt;
221 mbox_chan_received_data(chan: task->thread->chan, data: &data);
222
223 list_del(entry: &task->list_entry);
224}
225
226static void cmdq_task_handle_error(struct cmdq_task *task)
227{
228 struct cmdq_thread *thread = task->thread;
229 struct cmdq_task *next_task;
230 struct cmdq *cmdq = task->cmdq;
231
232 dev_err(cmdq->mbox.dev, "task 0x%p error\n", task);
233 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
234 next_task = list_first_entry_or_null(&thread->task_busy_list,
235 struct cmdq_task, list_entry);
236 if (next_task)
237 writel(val: next_task->pa_base >> cmdq->pdata->shift,
238 addr: thread->base + CMDQ_THR_CURR_ADDR);
239 cmdq_thread_resume(thread);
240}
241
242static void cmdq_thread_irq_handler(struct cmdq *cmdq,
243 struct cmdq_thread *thread)
244{
245 struct cmdq_task *task, *tmp, *curr_task = NULL;
246 u32 curr_pa, irq_flag, task_end_pa;
247 bool err;
248
249 irq_flag = readl(addr: thread->base + CMDQ_THR_IRQ_STATUS);
250 writel(val: ~irq_flag, addr: thread->base + CMDQ_THR_IRQ_STATUS);
251
252 /*
253 * When ISR call this function, another CPU core could run
254 * "release task" right before we acquire the spin lock, and thus
255 * reset / disable this GCE thread, so we need to check the enable
256 * bit of this GCE thread.
257 */
258 if (!(readl(addr: thread->base + CMDQ_THR_ENABLE_TASK) & CMDQ_THR_ENABLED))
259 return;
260
261 if (irq_flag & CMDQ_THR_IRQ_ERROR)
262 err = true;
263 else if (irq_flag & CMDQ_THR_IRQ_DONE)
264 err = false;
265 else
266 return;
267
268 curr_pa = readl(addr: thread->base + CMDQ_THR_CURR_ADDR) << cmdq->pdata->shift;
269
270 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
271 list_entry) {
272 task_end_pa = task->pa_base + task->pkt->cmd_buf_size;
273 if (curr_pa >= task->pa_base && curr_pa < task_end_pa)
274 curr_task = task;
275
276 if (!curr_task || curr_pa == task_end_pa - CMDQ_INST_SIZE) {
277 cmdq_task_exec_done(task, sta: 0);
278 kfree(objp: task);
279 } else if (err) {
280 cmdq_task_exec_done(task, sta: -ENOEXEC);
281 cmdq_task_handle_error(task: curr_task);
282 kfree(objp: task);
283 }
284
285 if (curr_task)
286 break;
287 }
288
289 if (list_empty(head: &thread->task_busy_list))
290 cmdq_thread_disable(cmdq, thread);
291}
292
293static irqreturn_t cmdq_irq_handler(int irq, void *dev)
294{
295 struct cmdq *cmdq = dev;
296 unsigned long irq_status, flags = 0L;
297 int bit;
298
299 irq_status = readl(addr: cmdq->base + CMDQ_CURR_IRQ_STATUS) & cmdq->irq_mask;
300 if (!(irq_status ^ cmdq->irq_mask))
301 return IRQ_NONE;
302
303 for_each_clear_bit(bit, &irq_status, cmdq->pdata->thread_nr) {
304 struct cmdq_thread *thread = &cmdq->thread[bit];
305
306 spin_lock_irqsave(&thread->chan->lock, flags);
307 cmdq_thread_irq_handler(cmdq, thread);
308 spin_unlock_irqrestore(lock: &thread->chan->lock, flags);
309 }
310
311 pm_runtime_mark_last_busy(dev: cmdq->mbox.dev);
312
313 return IRQ_HANDLED;
314}
315
316static int cmdq_runtime_resume(struct device *dev)
317{
318 struct cmdq *cmdq = dev_get_drvdata(dev);
319
320 return clk_bulk_enable(num_clks: cmdq->pdata->gce_num, clks: cmdq->clocks);
321}
322
323static int cmdq_runtime_suspend(struct device *dev)
324{
325 struct cmdq *cmdq = dev_get_drvdata(dev);
326
327 clk_bulk_disable(num_clks: cmdq->pdata->gce_num, clks: cmdq->clocks);
328 return 0;
329}
330
331static int cmdq_suspend(struct device *dev)
332{
333 struct cmdq *cmdq = dev_get_drvdata(dev);
334 struct cmdq_thread *thread;
335 int i;
336 bool task_running = false;
337
338 cmdq->suspended = true;
339
340 for (i = 0; i < cmdq->pdata->thread_nr; i++) {
341 thread = &cmdq->thread[i];
342 if (!list_empty(head: &thread->task_busy_list)) {
343 task_running = true;
344 break;
345 }
346 }
347
348 if (task_running)
349 dev_warn(dev, "exist running task(s) in suspend\n");
350
351 if (cmdq->pdata->sw_ddr_en)
352 cmdq_sw_ddr_enable(cmdq, enable: false);
353
354 return pm_runtime_force_suspend(dev);
355}
356
357static int cmdq_resume(struct device *dev)
358{
359 struct cmdq *cmdq = dev_get_drvdata(dev);
360
361 WARN_ON(pm_runtime_force_resume(dev));
362 cmdq->suspended = false;
363
364 if (cmdq->pdata->sw_ddr_en)
365 cmdq_sw_ddr_enable(cmdq, enable: true);
366
367 return 0;
368}
369
370static int cmdq_remove(struct platform_device *pdev)
371{
372 struct cmdq *cmdq = platform_get_drvdata(pdev);
373
374 if (cmdq->pdata->sw_ddr_en)
375 cmdq_sw_ddr_enable(cmdq, enable: false);
376
377 if (!IS_ENABLED(CONFIG_PM))
378 cmdq_runtime_suspend(dev: &pdev->dev);
379
380 clk_bulk_unprepare(num_clks: cmdq->pdata->gce_num, clks: cmdq->clocks);
381 return 0;
382}
383
384static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
385{
386 struct cmdq_pkt *pkt = (struct cmdq_pkt *)data;
387 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
388 struct cmdq *cmdq = dev_get_drvdata(dev: chan->mbox->dev);
389 struct cmdq_task *task;
390 unsigned long curr_pa, end_pa;
391 int ret;
392
393 /* Client should not flush new tasks if suspended. */
394 WARN_ON(cmdq->suspended);
395
396 ret = pm_runtime_get_sync(dev: cmdq->mbox.dev);
397 if (ret < 0)
398 return ret;
399
400 task = kzalloc(size: sizeof(*task), GFP_ATOMIC);
401 if (!task) {
402 pm_runtime_put_autosuspend(dev: cmdq->mbox.dev);
403 return -ENOMEM;
404 }
405
406 task->cmdq = cmdq;
407 INIT_LIST_HEAD(list: &task->list_entry);
408 task->pa_base = pkt->pa_base;
409 task->thread = thread;
410 task->pkt = pkt;
411
412 if (list_empty(head: &thread->task_busy_list)) {
413 /*
414 * The thread reset will clear thread related register to 0,
415 * including pc, end, priority, irq, suspend and enable. Thus
416 * set CMDQ_THR_ENABLED to CMDQ_THR_ENABLE_TASK will enable
417 * thread and make it running.
418 */
419 WARN_ON(cmdq_thread_reset(cmdq, thread) < 0);
420
421 writel(val: task->pa_base >> cmdq->pdata->shift,
422 addr: thread->base + CMDQ_THR_CURR_ADDR);
423 writel(val: (task->pa_base + pkt->cmd_buf_size) >> cmdq->pdata->shift,
424 addr: thread->base + CMDQ_THR_END_ADDR);
425
426 writel(val: thread->priority, addr: thread->base + CMDQ_THR_PRIORITY);
427 writel(CMDQ_THR_IRQ_EN, addr: thread->base + CMDQ_THR_IRQ_ENABLE);
428 writel(CMDQ_THR_ENABLED, addr: thread->base + CMDQ_THR_ENABLE_TASK);
429 } else {
430 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
431 curr_pa = readl(addr: thread->base + CMDQ_THR_CURR_ADDR) <<
432 cmdq->pdata->shift;
433 end_pa = readl(addr: thread->base + CMDQ_THR_END_ADDR) <<
434 cmdq->pdata->shift;
435 /* check boundary */
436 if (curr_pa == end_pa - CMDQ_INST_SIZE ||
437 curr_pa == end_pa) {
438 /* set to this task directly */
439 writel(val: task->pa_base >> cmdq->pdata->shift,
440 addr: thread->base + CMDQ_THR_CURR_ADDR);
441 } else {
442 cmdq_task_insert_into_thread(task);
443 smp_mb(); /* modify jump before enable thread */
444 }
445 writel(val: (task->pa_base + pkt->cmd_buf_size) >> cmdq->pdata->shift,
446 addr: thread->base + CMDQ_THR_END_ADDR);
447 cmdq_thread_resume(thread);
448 }
449 list_move_tail(list: &task->list_entry, head: &thread->task_busy_list);
450
451 pm_runtime_mark_last_busy(dev: cmdq->mbox.dev);
452 pm_runtime_put_autosuspend(dev: cmdq->mbox.dev);
453
454 return 0;
455}
456
457static int cmdq_mbox_startup(struct mbox_chan *chan)
458{
459 return 0;
460}
461
462static void cmdq_mbox_shutdown(struct mbox_chan *chan)
463{
464 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
465 struct cmdq *cmdq = dev_get_drvdata(dev: chan->mbox->dev);
466 struct cmdq_task *task, *tmp;
467 unsigned long flags;
468
469 WARN_ON(pm_runtime_get_sync(cmdq->mbox.dev));
470
471 spin_lock_irqsave(&thread->chan->lock, flags);
472 if (list_empty(head: &thread->task_busy_list))
473 goto done;
474
475 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
476
477 /* make sure executed tasks have success callback */
478 cmdq_thread_irq_handler(cmdq, thread);
479 if (list_empty(head: &thread->task_busy_list))
480 goto done;
481
482 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
483 list_entry) {
484 cmdq_task_exec_done(task, sta: -ECONNABORTED);
485 kfree(objp: task);
486 }
487
488 cmdq_thread_disable(cmdq, thread);
489
490done:
491 /*
492 * The thread->task_busy_list empty means thread already disable. The
493 * cmdq_mbox_send_data() always reset thread which clear disable and
494 * suspend statue when first pkt send to channel, so there is no need
495 * to do any operation here, only unlock and leave.
496 */
497 spin_unlock_irqrestore(lock: &thread->chan->lock, flags);
498
499 pm_runtime_mark_last_busy(dev: cmdq->mbox.dev);
500 pm_runtime_put_autosuspend(dev: cmdq->mbox.dev);
501}
502
503static int cmdq_mbox_flush(struct mbox_chan *chan, unsigned long timeout)
504{
505 struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
506 struct cmdq_cb_data data;
507 struct cmdq *cmdq = dev_get_drvdata(dev: chan->mbox->dev);
508 struct cmdq_task *task, *tmp;
509 unsigned long flags;
510 u32 enable;
511 int ret;
512
513 ret = pm_runtime_get_sync(dev: cmdq->mbox.dev);
514 if (ret < 0)
515 return ret;
516
517 spin_lock_irqsave(&thread->chan->lock, flags);
518 if (list_empty(head: &thread->task_busy_list))
519 goto out;
520
521 WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
522 if (!cmdq_thread_is_in_wfe(thread))
523 goto wait;
524
525 list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
526 list_entry) {
527 data.sta = -ECONNABORTED;
528 data.pkt = task->pkt;
529 mbox_chan_received_data(chan: task->thread->chan, data: &data);
530 list_del(entry: &task->list_entry);
531 kfree(objp: task);
532 }
533
534 cmdq_thread_resume(thread);
535 cmdq_thread_disable(cmdq, thread);
536
537out:
538 spin_unlock_irqrestore(lock: &thread->chan->lock, flags);
539 pm_runtime_mark_last_busy(dev: cmdq->mbox.dev);
540 pm_runtime_put_autosuspend(dev: cmdq->mbox.dev);
541
542 return 0;
543
544wait:
545 cmdq_thread_resume(thread);
546 spin_unlock_irqrestore(lock: &thread->chan->lock, flags);
547 if (readl_poll_timeout_atomic(thread->base + CMDQ_THR_ENABLE_TASK,
548 enable, enable == 0, 1, timeout)) {
549 dev_err(cmdq->mbox.dev, "Fail to wait GCE thread 0x%x done\n",
550 (u32)(thread->base - cmdq->base));
551
552 return -EFAULT;
553 }
554 pm_runtime_mark_last_busy(dev: cmdq->mbox.dev);
555 pm_runtime_put_autosuspend(dev: cmdq->mbox.dev);
556 return 0;
557}
558
559static const struct mbox_chan_ops cmdq_mbox_chan_ops = {
560 .send_data = cmdq_mbox_send_data,
561 .startup = cmdq_mbox_startup,
562 .shutdown = cmdq_mbox_shutdown,
563 .flush = cmdq_mbox_flush,
564};
565
566static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,
567 const struct of_phandle_args *sp)
568{
569 int ind = sp->args[0];
570 struct cmdq_thread *thread;
571
572 if (ind >= mbox->num_chans)
573 return ERR_PTR(error: -EINVAL);
574
575 thread = (struct cmdq_thread *)mbox->chans[ind].con_priv;
576 thread->priority = sp->args[1];
577 thread->chan = &mbox->chans[ind];
578
579 return &mbox->chans[ind];
580}
581
582static int cmdq_probe(struct platform_device *pdev)
583{
584 struct device *dev = &pdev->dev;
585 struct cmdq *cmdq;
586 int err, i;
587 struct device_node *phandle = dev->of_node;
588 struct device_node *node;
589 int alias_id = 0;
590 static const char * const clk_name = "gce";
591 static const char * const clk_names[] = { "gce0", "gce1" };
592
593 cmdq = devm_kzalloc(dev, size: sizeof(*cmdq), GFP_KERNEL);
594 if (!cmdq)
595 return -ENOMEM;
596
597 cmdq->base = devm_platform_ioremap_resource(pdev, index: 0);
598 if (IS_ERR(ptr: cmdq->base))
599 return PTR_ERR(ptr: cmdq->base);
600
601 cmdq->irq = platform_get_irq(pdev, 0);
602 if (cmdq->irq < 0)
603 return cmdq->irq;
604
605 cmdq->pdata = device_get_match_data(dev);
606 if (!cmdq->pdata) {
607 dev_err(dev, "failed to get match data\n");
608 return -EINVAL;
609 }
610
611 cmdq->irq_mask = GENMASK(cmdq->pdata->thread_nr - 1, 0);
612
613 dev_dbg(dev, "cmdq device: addr:0x%p, va:0x%p, irq:%d\n",
614 dev, cmdq->base, cmdq->irq);
615
616 if (cmdq->pdata->gce_num > 1) {
617 for_each_child_of_node(phandle->parent, node) {
618 alias_id = of_alias_get_id(np: node, stem: clk_name);
619 if (alias_id >= 0 && alias_id < cmdq->pdata->gce_num) {
620 cmdq->clocks[alias_id].id = clk_names[alias_id];
621 cmdq->clocks[alias_id].clk = of_clk_get(np: node, index: 0);
622 if (IS_ERR(ptr: cmdq->clocks[alias_id].clk)) {
623 of_node_put(node);
624 return dev_err_probe(dev,
625 err: PTR_ERR(ptr: cmdq->clocks[alias_id].clk),
626 fmt: "failed to get gce clk: %d\n",
627 alias_id);
628 }
629 }
630 }
631 } else {
632 cmdq->clocks[alias_id].id = clk_name;
633 cmdq->clocks[alias_id].clk = devm_clk_get(dev: &pdev->dev, id: clk_name);
634 if (IS_ERR(ptr: cmdq->clocks[alias_id].clk)) {
635 return dev_err_probe(dev, err: PTR_ERR(ptr: cmdq->clocks[alias_id].clk),
636 fmt: "failed to get gce clk\n");
637 }
638 }
639
640 cmdq->mbox.dev = dev;
641 cmdq->mbox.chans = devm_kcalloc(dev, n: cmdq->pdata->thread_nr,
642 size: sizeof(*cmdq->mbox.chans), GFP_KERNEL);
643 if (!cmdq->mbox.chans)
644 return -ENOMEM;
645
646 cmdq->mbox.num_chans = cmdq->pdata->thread_nr;
647 cmdq->mbox.ops = &cmdq_mbox_chan_ops;
648 cmdq->mbox.of_xlate = cmdq_xlate;
649
650 /* make use of TXDONE_BY_ACK */
651 cmdq->mbox.txdone_irq = false;
652 cmdq->mbox.txdone_poll = false;
653
654 cmdq->thread = devm_kcalloc(dev, n: cmdq->pdata->thread_nr,
655 size: sizeof(*cmdq->thread), GFP_KERNEL);
656 if (!cmdq->thread)
657 return -ENOMEM;
658
659 for (i = 0; i < cmdq->pdata->thread_nr; i++) {
660 cmdq->thread[i].base = cmdq->base + CMDQ_THR_BASE +
661 CMDQ_THR_SIZE * i;
662 INIT_LIST_HEAD(list: &cmdq->thread[i].task_busy_list);
663 cmdq->mbox.chans[i].con_priv = (void *)&cmdq->thread[i];
664 }
665
666 err = devm_mbox_controller_register(dev, mbox: &cmdq->mbox);
667 if (err < 0) {
668 dev_err(dev, "failed to register mailbox: %d\n", err);
669 return err;
670 }
671
672 platform_set_drvdata(pdev, data: cmdq);
673
674 WARN_ON(clk_bulk_prepare(cmdq->pdata->gce_num, cmdq->clocks));
675
676 cmdq_init(cmdq);
677
678 err = devm_request_irq(dev, irq: cmdq->irq, handler: cmdq_irq_handler, IRQF_SHARED,
679 devname: "mtk_cmdq", dev_id: cmdq);
680 if (err < 0) {
681 dev_err(dev, "failed to register ISR (%d)\n", err);
682 return err;
683 }
684
685 /* If Runtime PM is not available enable the clocks now. */
686 if (!IS_ENABLED(CONFIG_PM)) {
687 err = cmdq_runtime_resume(dev);
688 if (err)
689 return err;
690 }
691
692 err = devm_pm_runtime_enable(dev);
693 if (err)
694 return err;
695
696 pm_runtime_set_autosuspend_delay(dev, CMDQ_MBOX_AUTOSUSPEND_DELAY_MS);
697 pm_runtime_use_autosuspend(dev);
698
699 return 0;
700}
701
702static const struct dev_pm_ops cmdq_pm_ops = {
703 .suspend = cmdq_suspend,
704 .resume = cmdq_resume,
705 SET_RUNTIME_PM_OPS(cmdq_runtime_suspend,
706 cmdq_runtime_resume, NULL)
707};
708
709static const struct gce_plat gce_plat_v2 = {
710 .thread_nr = 16,
711 .shift = 0,
712 .control_by_sw = false,
713 .gce_num = 1
714};
715
716static const struct gce_plat gce_plat_v3 = {
717 .thread_nr = 24,
718 .shift = 0,
719 .control_by_sw = false,
720 .gce_num = 1
721};
722
723static const struct gce_plat gce_plat_v4 = {
724 .thread_nr = 24,
725 .shift = 3,
726 .control_by_sw = false,
727 .gce_num = 1
728};
729
730static const struct gce_plat gce_plat_v5 = {
731 .thread_nr = 24,
732 .shift = 3,
733 .control_by_sw = true,
734 .gce_num = 1
735};
736
737static const struct gce_plat gce_plat_v6 = {
738 .thread_nr = 24,
739 .shift = 3,
740 .control_by_sw = true,
741 .gce_num = 2
742};
743
744static const struct gce_plat gce_plat_v7 = {
745 .thread_nr = 24,
746 .shift = 3,
747 .control_by_sw = true,
748 .sw_ddr_en = true,
749 .gce_num = 1
750};
751
752static const struct of_device_id cmdq_of_ids[] = {
753 {.compatible = "mediatek,mt8173-gce", .data = (void *)&gce_plat_v2},
754 {.compatible = "mediatek,mt8183-gce", .data = (void *)&gce_plat_v3},
755 {.compatible = "mediatek,mt8186-gce", .data = (void *)&gce_plat_v7},
756 {.compatible = "mediatek,mt6779-gce", .data = (void *)&gce_plat_v4},
757 {.compatible = "mediatek,mt8192-gce", .data = (void *)&gce_plat_v5},
758 {.compatible = "mediatek,mt8195-gce", .data = (void *)&gce_plat_v6},
759 {}
760};
761
762static struct platform_driver cmdq_drv = {
763 .probe = cmdq_probe,
764 .remove = cmdq_remove,
765 .driver = {
766 .name = "mtk_cmdq",
767 .pm = &cmdq_pm_ops,
768 .of_match_table = cmdq_of_ids,
769 }
770};
771
772static int __init cmdq_drv_init(void)
773{
774 return platform_driver_register(&cmdq_drv);
775}
776
777static void __exit cmdq_drv_exit(void)
778{
779 platform_driver_unregister(&cmdq_drv);
780}
781
782subsys_initcall(cmdq_drv_init);
783module_exit(cmdq_drv_exit);
784
785MODULE_LICENSE("GPL v2");
786

source code of linux/drivers/mailbox/mtk-cmdq-mailbox.c