2 * OMAP Remote Processor driver
4 * Copyright (C) 2011 Texas Instruments, Inc.
5 * Copyright (C) 2011 Google, Inc.
7 * Ohad Ben-Cohen <ohad@wizery.com>
8 * Brian Swetland <swetland@google.com>
9 * Fernando Guzman Lugo <fernando.lugo@ti.com>
10 * Mark Grosen <mgrosen@ti.com>
11 * Suman Anna <s-anna@ti.com>
12 * Hari Kanigeri <h-kanigeri2@ti.com>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * version 2 as published by the Free Software Foundation.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/err.h>
27 #include <linux/platform_device.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/remoteproc.h>
31 #include <plat/mailbox.h>
32 #include <plat/remoteproc.h>
34 #include "omap_remoteproc.h"
35 #include "remoteproc_internal.h"
38 * struct omap_rproc - omap remote processor state
39 * @mbox: omap mailbox handle
40 * @nb: notifier block that will be invoked on inbound mailbox messages
41 * @rproc: rproc handle
44 struct omap_mbox *mbox;
45 struct notifier_block nb;
50 * omap_rproc_mbox_callback() - inbound mailbox message handler
51 * @this: notifier block
53 * @data: mailbox payload
55 * This handler is invoked by omap's mailbox driver whenever a mailbox
56 * message is received. Usually, the mailbox payload simply contains
57 * the index of the virtqueue that is kicked by the remote processor,
58 * and we let remoteproc core handle it.
60 * In addition to virtqueue indices, we also have some out-of-band values
61 * that indicates different events. Those values are deliberately very
62 * big so they don't coincide with virtqueue indices.
64 static int omap_rproc_mbox_callback(struct notifier_block *this,
65 unsigned long index, void *data)
67 mbox_msg_t msg = (mbox_msg_t) data;
68 struct omap_rproc *oproc = container_of(this, struct omap_rproc, nb);
69 struct device *dev = oproc->rproc->dev;
70 const char *name = oproc->rproc->name;
72 dev_dbg(dev, "mbox msg: 0x%x\n", msg);
76 /* just log this for now. later, we'll also do recovery */
77 dev_err(dev, "omap rproc %s crashed\n", name);
79 case RP_MBOX_ECHO_REPLY:
80 dev_info(dev, "received echo reply from %s\n", name);
83 /* msg contains the index of the triggered vring */
84 if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
85 dev_dbg(dev, "no message was found in vqid %d\n", msg);
91 /* kick a virtqueue */
92 static void omap_rproc_kick(struct rproc *rproc, int vqid)
94 struct omap_rproc *oproc = rproc->priv;
97 /* send the index of the triggered virtqueue in the mailbox payload */
98 ret = omap_mbox_msg_send(oproc->mbox, vqid);
100 dev_err(rproc->dev, "omap_mbox_msg_send failed: %d\n", ret);
104 * Power up the remote processor.
106 * This function will be invoked only after the firmware for this rproc
107 * was loaded, parsed successfully, and all of its resource requirements
110 static int omap_rproc_start(struct rproc *rproc)
112 struct omap_rproc *oproc = rproc->priv;
113 struct platform_device *pdev = to_platform_device(rproc->dev);
114 struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
117 oproc->nb.notifier_call = omap_rproc_mbox_callback;
119 /* every omap rproc is assigned a mailbox instance for messaging */
120 oproc->mbox = omap_mbox_get(pdata->mbox_name, &oproc->nb);
121 if (IS_ERR(oproc->mbox)) {
122 ret = PTR_ERR(oproc->mbox);
123 dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
128 * Ping the remote processor. this is only for sanity-sake;
129 * there is no functional effect whatsoever.
131 * Note that the reply will _not_ arrive immediately: this message
132 * will wait in the mailbox fifo until the remote processor is booted.
134 ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
136 dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
140 ret = pdata->device_enable(pdev);
142 dev_err(rproc->dev, "omap_device_enable failed: %d\n", ret);
149 omap_mbox_put(oproc->mbox, &oproc->nb);
153 /* power off the remote processor */
154 static int omap_rproc_stop(struct rproc *rproc)
156 struct platform_device *pdev = to_platform_device(rproc->dev);
157 struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
158 struct omap_rproc *oproc = rproc->priv;
161 ret = pdata->device_shutdown(pdev);
165 omap_mbox_put(oproc->mbox, &oproc->nb);
170 static struct rproc_ops omap_rproc_ops = {
171 .start = omap_rproc_start,
172 .stop = omap_rproc_stop,
173 .kick = omap_rproc_kick,
176 static int __devinit omap_rproc_probe(struct platform_device *pdev)
178 struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
179 struct omap_rproc *oproc;
183 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
185 dev_err(pdev->dev.parent, "dma_set_coherent_mask: %d\n", ret);
189 rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
190 pdata->firmware, sizeof(*oproc));
195 oproc->rproc = rproc;
197 platform_set_drvdata(pdev, rproc);
199 ret = rproc_register(rproc);
210 static int __devexit omap_rproc_remove(struct platform_device *pdev)
212 struct rproc *rproc = platform_get_drvdata(pdev);
214 return rproc_unregister(rproc);
217 static struct platform_driver omap_rproc_driver = {
218 .probe = omap_rproc_probe,
219 .remove = __devexit_p(omap_rproc_remove),
221 .name = "omap-rproc",
222 .owner = THIS_MODULE,
226 module_platform_driver(omap_rproc_driver);
228 MODULE_LICENSE("GPL v2");
229 MODULE_DESCRIPTION("OMAP Remote Processor control driver");