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.parent;
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;
95 struct device *dev = rproc->dev.parent;
98 /* send the index of the triggered virtqueue in the mailbox payload */
99 ret = omap_mbox_msg_send(oproc->mbox, vqid);
101 dev_err(dev, "omap_mbox_msg_send failed: %d\n", ret);
105 * Power up the remote processor.
107 * This function will be invoked only after the firmware for this rproc
108 * was loaded, parsed successfully, and all of its resource requirements
111 static int omap_rproc_start(struct rproc *rproc)
113 struct omap_rproc *oproc = rproc->priv;
114 struct device *dev = rproc->dev.parent;
115 struct platform_device *pdev = to_platform_device(dev);
116 struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
119 oproc->nb.notifier_call = omap_rproc_mbox_callback;
121 /* every omap rproc is assigned a mailbox instance for messaging */
122 oproc->mbox = omap_mbox_get(pdata->mbox_name, &oproc->nb);
123 if (IS_ERR(oproc->mbox)) {
124 ret = PTR_ERR(oproc->mbox);
125 dev_err(dev, "omap_mbox_get failed: %d\n", ret);
130 * Ping the remote processor. this is only for sanity-sake;
131 * there is no functional effect whatsoever.
133 * Note that the reply will _not_ arrive immediately: this message
134 * will wait in the mailbox fifo until the remote processor is booted.
136 ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
138 dev_err(dev, "omap_mbox_get failed: %d\n", ret);
142 ret = pdata->device_enable(pdev);
144 dev_err(dev, "omap_device_enable failed: %d\n", ret);
151 omap_mbox_put(oproc->mbox, &oproc->nb);
155 /* power off the remote processor */
156 static int omap_rproc_stop(struct rproc *rproc)
158 struct device *dev = rproc->dev.parent;
159 struct platform_device *pdev = to_platform_device(dev);
160 struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
161 struct omap_rproc *oproc = rproc->priv;
164 ret = pdata->device_shutdown(pdev);
168 omap_mbox_put(oproc->mbox, &oproc->nb);
173 static struct rproc_ops omap_rproc_ops = {
174 .start = omap_rproc_start,
175 .stop = omap_rproc_stop,
176 .kick = omap_rproc_kick,
179 static int __devinit omap_rproc_probe(struct platform_device *pdev)
181 struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
182 struct omap_rproc *oproc;
186 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
188 dev_err(&pdev->dev, "dma_set_coherent_mask: %d\n", ret);
192 rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
193 pdata->firmware, sizeof(*oproc));
198 oproc->rproc = rproc;
200 platform_set_drvdata(pdev, rproc);
202 ret = rproc_add(rproc);
213 static int __devexit omap_rproc_remove(struct platform_device *pdev)
215 struct rproc *rproc = platform_get_drvdata(pdev);
223 static struct platform_driver omap_rproc_driver = {
224 .probe = omap_rproc_probe,
225 .remove = __devexit_p(omap_rproc_remove),
227 .name = "omap-rproc",
228 .owner = THIS_MODULE,
232 module_platform_driver(omap_rproc_driver);
234 MODULE_LICENSE("GPL v2");
235 MODULE_DESCRIPTION("OMAP Remote Processor control driver");