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