drivers/remoteproc/omap_remoteproc.c

   1 /*
   2  * OMAP Remote Processor driver
   3  *
   4  * Copyright (C) 2011 Texas Instruments, Inc.
   5  * Copyright (C) 2011 Google, Inc.
   6  *
   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>
  13  *
  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.
  17  *
  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.
  22  */
  23
  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>
  30
  31 #include <plat/mailbox.h>
  32 #include <plat/remoteproc.h>
  33
  34 #include "omap_remoteproc.h"
  35 #include "remoteproc_internal.h"
  36
  37 /**
  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
  42  */
  43 struct omap_rproc {
  44         struct omap_mbox *mbox;
  45         struct notifier_block nb;
  46         struct rproc *rproc;
  47 };
  48
  49 /**
  50  * omap_rproc_mbox_callback() - inbound mailbox message handler
  51  * @this: notifier block
  52  * @index: unused
  53  * @data: mailbox payload
  54  *
  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.
  59  *
  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.
  63  */
  64 static int omap_rproc_mbox_callback(struct notifier_block *this,
  65                                         unsigned long index, void *data)
  66 {
  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;
  71
  72         dev_dbg(dev, "mbox msg: 0x%x\n", msg);
  73
  74         switch (msg) {
  75         case RP_MBOX_CRASH:
  76                 /* just log this for now. later, we'll also do recovery */
  77                 dev_err(dev, "omap rproc %s crashed\n", name);
  78                 break;
  79         case RP_MBOX_ECHO_REPLY:
  80                 dev_info(dev, "received echo reply from %s\n", name);
  81                 break;
  82         default:
  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);
  86         }
  87
  88         return NOTIFY_DONE;
  89 }
  90
  91 /* kick a virtqueue */
  92 static void omap_rproc_kick(struct rproc *rproc, int vqid)
  93 {
  94         struct omap_rproc *oproc = rproc->priv;
  95         struct device *dev = rproc->dev.parent;
  96         int ret;
  97
  98         /* send the index of the triggered virtqueue in the mailbox payload */
  99         ret = omap_mbox_msg_send(oproc->mbox, vqid);
 100         if (ret)
 101                 dev_err(dev, "omap_mbox_msg_send failed: %d\n", ret);
 102 }
 103
 104 /*
 105  * Power up the remote processor.
 106  *
 107  * This function will be invoked only after the firmware for this rproc
 108  * was loaded, parsed successfully, and all of its resource requirements
 109  * were met.
 110  */
 111 static int omap_rproc_start(struct rproc *rproc)
 112 {
 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;
 117         int ret;
 118
 119         oproc->nb.notifier_call = omap_rproc_mbox_callback;
 120
 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);
 126                 return ret;
 127         }
 128
 129         /*
 130          * Ping the remote processor. this is only for sanity-sake;
 131          * there is no functional effect whatsoever.
 132          *
 133          * Note that the reply will _not_ arrive immediately: this message
 134          * will wait in the mailbox fifo until the remote processor is booted.
 135          */
 136         ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
 137         if (ret) {
 138                 dev_err(dev, "omap_mbox_get failed: %d\n", ret);
 139                 goto put_mbox;
 140         }
 141
 142         ret = pdata->device_enable(pdev);
 143         if (ret) {
 144                 dev_err(dev, "omap_device_enable failed: %d\n", ret);
 145                 goto put_mbox;
 146         }
 147
 148         return 0;
 149
 150 put_mbox:
 151         omap_mbox_put(oproc->mbox, &oproc->nb);
 152         return ret;
 153 }
 154
 155 /* power off the remote processor */
 156 static int omap_rproc_stop(struct rproc *rproc)
 157 {
 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;
 162         int ret;
 163
 164         ret = pdata->device_shutdown(pdev);
 165         if (ret)
 166                 return ret;
 167
 168         omap_mbox_put(oproc->mbox, &oproc->nb);
 169
 170         return 0;
 171 }
 172
 173 static struct rproc_ops omap_rproc_ops = {
 174         .start          = omap_rproc_start,
 175         .stop           = omap_rproc_stop,
 176         .kick           = omap_rproc_kick,
 177 };
 178
 179 static int __devinit omap_rproc_probe(struct platform_device *pdev)
 180 {
 181         struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 182         struct omap_rproc *oproc;
 183         struct rproc *rproc;
 184         int ret;
 185
 186         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 187         if (ret) {
 188                 dev_err(&pdev->dev, "dma_set_coherent_mask: %d\n", ret);
 189                 return ret;
 190         }
 191
 192         rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
 193                                 pdata->firmware, sizeof(*oproc));
 194         if (!rproc)
 195                 return -ENOMEM;
 196
 197         oproc = rproc->priv;
 198         oproc->rproc = rproc;
 199
 200         platform_set_drvdata(pdev, rproc);
 201
 202         ret = rproc_add(rproc);
 203         if (ret)
 204                 goto free_rproc;
 205
 206         return 0;
 207
 208 free_rproc:
 209         rproc_put(rproc);
 210         return ret;
 211 }
 212
 213 static int __devexit omap_rproc_remove(struct platform_device *pdev)
 214 {
 215         struct rproc *rproc = platform_get_drvdata(pdev);
 216
 217         rproc_del(rproc);
 218         rproc_put(rproc);
 219
 220         return 0;
 221 }
 222
 223 static struct platform_driver omap_rproc_driver = {
 224         .probe = omap_rproc_probe,
 225         .remove = __devexit_p(omap_rproc_remove),
 226         .driver = {
 227                 .name = "omap-rproc",
 228                 .owner = THIS_MODULE,
 229         },
 230 };
 231
 232 module_platform_driver(omap_rproc_driver);
 233
 234 MODULE_LICENSE("GPL v2");
 235 MODULE_DESCRIPTION("OMAP Remote Processor control driver");