summaryrefslogtreecommitdiffstats
path: root/drivers/remoteproc/omap_remoteproc.c
blob: e85f30370760ded083d740960c7de9d5f9d1a4e4 (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
/*
 * OMAP Remote Processor driver
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2011 Google, Inc.
 *
 * Ohad Ben-Cohen <ohad@wizery.com>
 * Brian Swetland <swetland@google.com>
 * Fernando Guzman Lugo <fernando.lugo@ti.com>
 * Mark Grosen <mgrosen@ti.com>
 * Suman Anna <s-anna@ti.com>
 * Hari Kanigeri <h-kanigeri2@ti.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/remoteproc.h>
#include <linux/mailbox_client.h>
#include <linux/omap-mailbox.h>

#include <linux/platform_data/remoteproc-omap.h>

#include "omap_remoteproc.h"
#include "remoteproc_internal.h"

/**
 * struct omap_rproc - omap remote processor state
 * @mbox: mailbox channel handle
 * @client: mailbox client to request the mailbox channel
 * @rproc: rproc handle
 */
struct omap_rproc {
	struct mbox_chan *mbox;
	struct mbox_client client;
	struct rproc *rproc;
};

/**
 * omap_rproc_mbox_callback() - inbound mailbox message handler
 * @client: mailbox client pointer used for requesting the mailbox channel
 * @data: mailbox payload
 *
 * This handler is invoked by omap's mailbox driver whenever a mailbox
 * message is received. Usually, the mailbox payload simply contains
 * the index of the virtqueue that is kicked by the remote processor,
 * and we let remoteproc core handle it.
 *
 * In addition to virtqueue indices, we also have some out-of-band values
 * that indicates different events. Those values are deliberately very
 * big so they don't coincide with virtqueue indices.
 */
static void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
{
	struct omap_rproc *oproc = container_of(client, struct omap_rproc,
						client);
	struct device *dev = oproc->rproc->dev.parent;
	const char *name = oproc->rproc->name;
	u32 msg = (u32)data;

	dev_dbg(dev, "mbox msg: 0x%x\n", msg);

	switch (msg) {
	case RP_MBOX_CRASH:
		/* just log this for now. later, we'll also do recovery */
		dev_err(dev, "omap rproc %s crashed\n", name);
		break;
	case RP_MBOX_ECHO_REPLY:
		dev_info(dev, "received echo reply from %s\n", name);
		break;
	default:
		/* msg contains the index of the triggered vring */
		if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
			dev_dbg(dev, "no message was found in vqid %d\n", msg);
	}
}

/* kick a virtqueue */
static void omap_rproc_kick(struct rproc *rproc, int vqid)
{
	struct omap_rproc *oproc = rproc->priv;
	struct device *dev = rproc->dev.parent;
	int ret;

	/* send the index of the triggered virtqueue in the mailbox payload */
	ret = mbox_send_message(oproc->mbox, (void *)vqid);
	if (ret < 0)
		dev_err(dev, "omap_mbox_msg_send failed: %d\n", ret);
}

/*
 * Power up the remote processor.
 *
 * This function will be invoked only after the firmware for this rproc
 * was loaded, parsed successfully, and all of its resource requirements
 * were met.
 */
static int omap_rproc_start(struct rproc *rproc)
{
	struct omap_rproc *oproc = rproc->priv;
	struct device *dev = rproc->dev.parent;
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
	int ret;
	struct mbox_client *client = &oproc->client;

	if (pdata->set_bootaddr)
		pdata->set_bootaddr(rproc->bootaddr);

	client->dev = dev;
	client->tx_done = NULL;
	client->rx_callback = omap_rproc_mbox_callback;
	client->tx_block = false;
	client->knows_txdone = false;

	oproc->mbox = omap_mbox_request_channel(client, pdata->mbox_name);
	if (IS_ERR(oproc->mbox)) {
		ret = -EBUSY;
		dev_err(dev, "mbox_request_channel failed: %ld\n",
			PTR_ERR(oproc->mbox));
		return ret;
	}

	/*
	 * Ping the remote processor. this is only for sanity-sake;
	 * there is no functional effect whatsoever.
	 *
	 * Note that the reply will _not_ arrive immediately: this message
	 * will wait in the mailbox fifo until the remote processor is booted.
	 */
	ret = mbox_send_message(oproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
	if (ret < 0) {
		dev_err(dev, "mbox_send_message failed: %d\n", ret);
		goto put_mbox;
	}

	ret = pdata->device_enable(pdev);
	if (ret) {
		dev_err(dev, "omap_device_enable failed: %d\n", ret);
		goto put_mbox;
	}

	return 0;

put_mbox:
	mbox_free_channel(oproc->mbox);
	return ret;
}

/* power off the remote processor */
static int omap_rproc_stop(struct rproc *rproc)
{
	struct device *dev = rproc->dev.parent;
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
	struct omap_rproc *oproc = rproc->priv;
	int ret;

	ret = pdata->device_shutdown(pdev);
	if (ret)
		return ret;

	mbox_free_channel(oproc->mbox);

	return 0;
}

static struct rproc_ops omap_rproc_ops = {
	.start		= omap_rproc_start,
	.stop		= omap_rproc_stop,
	.kick		= omap_rproc_kick,
};

static int omap_rproc_probe(struct platform_device *pdev)
{
	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
	struct omap_rproc *oproc;
	struct rproc *rproc;
	int ret;

	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (ret) {
		dev_err(&pdev->dev, "dma_set_coherent_mask: %d\n", ret);
		return ret;
	}

	rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
				pdata->firmware, sizeof(*oproc));
	if (!rproc)
		return -ENOMEM;

	oproc = rproc->priv;
	oproc->rproc = rproc;

	platform_set_drvdata(pdev, rproc);

	ret = rproc_add(rproc);
	if (ret)
		goto free_rproc;

	return 0;

free_rproc:
	rproc_put(rproc);
	return ret;
}

static int omap_rproc_remove(struct platform_device *pdev)
{
	struct rproc *rproc = platform_get_drvdata(pdev);

	rproc_del(rproc);
	rproc_put(rproc);

	return 0;
}

static struct platform_driver omap_rproc_driver = {
	.probe = omap_rproc_probe,
	.remove = omap_rproc_remove,
	.driver = {
		.name = "omap-rproc",
	},
};

module_platform_driver(omap_rproc_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("OMAP Remote Processor control driver");
OpenPOWER on IntegriCloud