summaryrefslogtreecommitdiffstats
path: root/drivers/soc/mediatek/mtk-cmdq-helper.c
blob: 9add0fd5fa6cc5964125885d2a3bf81df7fbd195 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2018 MediaTek Inc.

#include <linux/completion.h>
#include <linux/errno.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/mailbox_controller.h>
#include <linux/soc/mediatek/mtk-cmdq.h>

#define CMDQ_WRITE_ENABLE_MASK	BIT(0)
#define CMDQ_POLL_ENABLE_MASK	BIT(0)
#define CMDQ_EOC_IRQ_EN		BIT(0)
#define CMDQ_EOC_CMD		((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
				<< 32 | CMDQ_EOC_IRQ_EN)

struct cmdq_instruction {
	union {
		u32 value;
		u32 mask;
	};
	union {
		u16 offset;
		u16 event;
	};
	u8 subsys;
	u8 op;
};

int cmdq_dev_get_client_reg(struct device *dev,
			    struct cmdq_client_reg *client_reg, int idx)
{
	struct of_phandle_args spec;
	int err;

	if (!client_reg)
		return -ENOENT;

	err = of_parse_phandle_with_fixed_args(dev->of_node,
					       "mediatek,gce-client-reg",
					       3, idx, &spec);
	if (err < 0) {
		dev_err(dev,
			"error %d can't parse gce-client-reg property (%d)",
			err, idx);

		return err;
	}

	client_reg->subsys = (u8)spec.args[0];
	client_reg->offset = (u16)spec.args[1];
	client_reg->size = (u16)spec.args[2];
	of_node_put(spec.np);

	return 0;
}
EXPORT_SYMBOL(cmdq_dev_get_client_reg);

static void cmdq_client_timeout(struct timer_list *t)
{
	struct cmdq_client *client = from_timer(client, t, timer);

	dev_err(client->client.dev, "cmdq timeout!\n");
}

struct cmdq_client *cmdq_mbox_create(struct device *dev, int index, u32 timeout)
{
	struct cmdq_client *client;

	client = kzalloc(sizeof(*client), GFP_KERNEL);
	if (!client)
		return (struct cmdq_client *)-ENOMEM;

	client->timeout_ms = timeout;
	if (timeout != CMDQ_NO_TIMEOUT) {
		spin_lock_init(&client->lock);
		timer_setup(&client->timer, cmdq_client_timeout, 0);
	}
	client->pkt_cnt = 0;
	client->client.dev = dev;
	client->client.tx_block = false;
	client->chan = mbox_request_channel(&client->client, index);

	if (IS_ERR(client->chan)) {
		long err;

		dev_err(dev, "failed to request channel\n");
		err = PTR_ERR(client->chan);
		kfree(client);

		return ERR_PTR(err);
	}

	return client;
}
EXPORT_SYMBOL(cmdq_mbox_create);

void cmdq_mbox_destroy(struct cmdq_client *client)
{
	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
		spin_lock(&client->lock);
		del_timer_sync(&client->timer);
		spin_unlock(&client->lock);
	}
	mbox_free_channel(client->chan);
	kfree(client);
}
EXPORT_SYMBOL(cmdq_mbox_destroy);

struct cmdq_pkt *cmdq_pkt_create(struct cmdq_client *client, size_t size)
{
	struct cmdq_pkt *pkt;
	struct device *dev;
	dma_addr_t dma_addr;

	pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
	if (!pkt)
		return ERR_PTR(-ENOMEM);
	pkt->va_base = kzalloc(size, GFP_KERNEL);
	if (!pkt->va_base) {
		kfree(pkt);
		return ERR_PTR(-ENOMEM);
	}
	pkt->buf_size = size;
	pkt->cl = (void *)client;

	dev = client->chan->mbox->dev;
	dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
				  DMA_TO_DEVICE);
	if (dma_mapping_error(dev, dma_addr)) {
		dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
		kfree(pkt->va_base);
		kfree(pkt);
		return ERR_PTR(-ENOMEM);
	}

	pkt->pa_base = dma_addr;

	return pkt;
}
EXPORT_SYMBOL(cmdq_pkt_create);

void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
{
	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

	dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
			 DMA_TO_DEVICE);
	kfree(pkt->va_base);
	kfree(pkt);
}
EXPORT_SYMBOL(cmdq_pkt_destroy);

static int cmdq_pkt_append_command(struct cmdq_pkt *pkt,
				   struct cmdq_instruction inst)
{
	struct cmdq_instruction *cmd_ptr;

	if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
		/*
		 * In the case of allocated buffer size (pkt->buf_size) is used
		 * up, the real required size (pkt->cmdq_buf_size) is still
		 * increased, so that the user knows how much memory should be
		 * ultimately allocated after appending all commands and
		 * flushing the command packet. Therefor, the user can call
		 * cmdq_pkt_create() again with the real required buffer size.
		 */
		pkt->cmd_buf_size += CMDQ_INST_SIZE;
		WARN_ONCE(1, "%s: buffer size %u is too small !\n",
			__func__, (u32)pkt->buf_size);
		return -ENOMEM;
	}

	cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
	*cmd_ptr = inst;
	pkt->cmd_buf_size += CMDQ_INST_SIZE;

	return 0;
}

int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
{
	struct cmdq_instruction inst;

	inst.op = CMDQ_CODE_WRITE;
	inst.value = value;
	inst.offset = offset;
	inst.subsys = subsys;

	return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_write);

int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
			u16 offset, u32 value, u32 mask)
{
	struct cmdq_instruction inst = { {0} };
	u16 offset_mask = offset;
	int err;

	if (mask != 0xffffffff) {
		inst.op = CMDQ_CODE_MASK;
		inst.mask = ~mask;
		err = cmdq_pkt_append_command(pkt, inst);
		if (err < 0)
			return err;

		offset_mask |= CMDQ_WRITE_ENABLE_MASK;
	}
	err = cmdq_pkt_write(pkt, subsys, offset_mask, value);

	return err;
}
EXPORT_SYMBOL(cmdq_pkt_write_mask);

int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
{
	struct cmdq_instruction inst = { {0} };

	if (event >= CMDQ_MAX_EVENT)
		return -EINVAL;

	inst.op = CMDQ_CODE_WFE;
	inst.value = CMDQ_WFE_OPTION;
	inst.event = event;

	return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_wfe);

int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
{
	struct cmdq_instruction inst = { {0} };

	if (event >= CMDQ_MAX_EVENT)
		return -EINVAL;

	inst.op = CMDQ_CODE_WFE;
	inst.value = CMDQ_WFE_UPDATE;
	inst.event = event;

	return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_clear_event);

int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
		  u16 offset, u32 value)
{
	struct cmdq_instruction inst = { {0} };
	int err;

	inst.op = CMDQ_CODE_POLL;
	inst.value = value;
	inst.offset = offset;
	inst.subsys = subsys;
	err = cmdq_pkt_append_command(pkt, inst);

	return err;
}
EXPORT_SYMBOL(cmdq_pkt_poll);

int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
		       u16 offset, u32 value, u32 mask)
{
	struct cmdq_instruction inst = { {0} };
	int err;

	inst.op = CMDQ_CODE_MASK;
	inst.mask = ~mask;
	err = cmdq_pkt_append_command(pkt, inst);
	if (err < 0)
		return err;

	offset = offset | CMDQ_POLL_ENABLE_MASK;
	err = cmdq_pkt_poll(pkt, subsys, offset, value);

	return err;
}
EXPORT_SYMBOL(cmdq_pkt_poll_mask);

static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
{
	struct cmdq_instruction inst = { {0} };
	int err;

	/* insert EOC and generate IRQ for each command iteration */
	inst.op = CMDQ_CODE_EOC;
	inst.value = CMDQ_EOC_IRQ_EN;
	err = cmdq_pkt_append_command(pkt, inst);
	if (err < 0)
		return err;

	/* JUMP to end */
	inst.op = CMDQ_CODE_JUMP;
	inst.value = CMDQ_JUMP_PASS;
	err = cmdq_pkt_append_command(pkt, inst);

	return err;
}

static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
{
	struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
	struct cmdq_task_cb *cb = &pkt->cb;
	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
		unsigned long flags = 0;

		spin_lock_irqsave(&client->lock, flags);
		if (--client->pkt_cnt == 0)
			del_timer(&client->timer);
		else
			mod_timer(&client->timer, jiffies +
				  msecs_to_jiffies(client->timeout_ms));
		spin_unlock_irqrestore(&client->lock, flags);
	}

	dma_sync_single_for_cpu(client->chan->mbox->dev, pkt->pa_base,
				pkt->cmd_buf_size, DMA_TO_DEVICE);
	if (cb->cb) {
		data.data = cb->data;
		cb->cb(data);
	}
}

int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
			 void *data)
{
	int err;
	unsigned long flags = 0;
	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

	err = cmdq_pkt_finalize(pkt);
	if (err < 0)
		return err;

	pkt->cb.cb = cb;
	pkt->cb.data = data;
	pkt->async_cb.cb = cmdq_pkt_flush_async_cb;
	pkt->async_cb.data = pkt;

	dma_sync_single_for_device(client->chan->mbox->dev, pkt->pa_base,
				   pkt->cmd_buf_size, DMA_TO_DEVICE);

	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
		spin_lock_irqsave(&client->lock, flags);
		if (client->pkt_cnt++ == 0)
			mod_timer(&client->timer, jiffies +
				  msecs_to_jiffies(client->timeout_ms));
		spin_unlock_irqrestore(&client->lock, flags);
	}

	mbox_send_message(client->chan, pkt);
	/* We can send next packet immediately, so just call txdone. */
	mbox_client_txdone(client->chan, 0);

	return 0;
}
EXPORT_SYMBOL(cmdq_pkt_flush_async);

struct cmdq_flush_completion {
	struct completion cmplt;
	bool err;
};

static void cmdq_pkt_flush_cb(struct cmdq_cb_data data)
{
	struct cmdq_flush_completion *cmplt;

	cmplt = (struct cmdq_flush_completion *)data.data;
	if (data.sta != CMDQ_CB_NORMAL)
		cmplt->err = true;
	else
		cmplt->err = false;
	complete(&cmplt->cmplt);
}

int cmdq_pkt_flush(struct cmdq_pkt *pkt)
{
	struct cmdq_flush_completion cmplt;
	int err;

	init_completion(&cmplt.cmplt);
	err = cmdq_pkt_flush_async(pkt, cmdq_pkt_flush_cb, &cmplt);
	if (err < 0)
		return err;
	wait_for_completion(&cmplt.cmplt);

	return cmplt.err ? -EFAULT : 0;
}
EXPORT_SYMBOL(cmdq_pkt_flush);

MODULE_LICENSE("GPL v2");